a*算法代码 python,python isalpha方法
2023-12-13 09:52:54
大家好，小编来为大家解答以下问题，a*算法代码 python，python isalpha方法，今天让我们一起来看看吧！
更新：
GitHub - pierrepaleo/sift_pyocl: An implementation of SIFT on GPU with OpenCL
python-siftgpu
特征点：
Add ASIFT to OpenCV · Issue #4399 · opencv/opencv · GitHub
https://bitbucket.org/xa4a/diploma/src/1046293ccb8c/prog/features/
https://rdguez-mariano.github.io/pages/hyperdeors
research-papers | Mariano Rodríguez
https://github.com/opencv/opencv/blob/master/samples/python/asift.py
http://www.cmap.polytechnique.fr/~yu/research/ASIFT/demo.html
OpenCV ASift C++ Implementation – Matt Sheckells
IPOL Journal · ASIFT: An Algorithm for Fully Affine Invariant Comparison
Affine invariant feature-based image matching
https://www.cnblogs.com/dwdxdy/p/3580038.html
OpenCV-Python实践之ASIFT框架仿射特征匹配算法_asift匹配例图-CSDN博客
GPU-ASIFT - CODE: A Wide-Baseline Feature Matcher
https://github.com/opencv/opencv/blob/master/samples/python/asift.py
'''
Affine invariant feature-based image matching sample.
This sample is similar to find_obj.py, but uses the affine transformation
space sampling technique, called ASIFT [1]. While the original implementation
is based on SIFT, you can try to use SURF or ORB detectors instead. Homography RANSAC
is used to reject outliers. Threading is used for faster affine sampling.
[1] http://www.ipol.im/pub/algo/my_affine_sift/
USAGE
asift.py [--feature=<sift|surf|orb|brisk>[-flann]] [ <image1> <image2> ]
--feature - Feature to use. Can be sift, surf, orb or brisk. Append '-flann'
to feature name to use Flann-based matcher instead bruteforce.
Press left mouse button on a feature point to see its matching point.
'''
# Python 2/3 compatibility
from __future__ import print_function
import numpy as np
import cv2 as cv
# built-in modules
import itertools as it
from multiprocessing.pool import ThreadPool
# local modules
from common import Timer
from find_obj import init_feature, filter_matches, explore_match
def affine_skew(tilt, phi, img, mask=None):
'''
affine_skew(tilt, phi, img, mask=None) -> skew_img, skew_mask, Ai
Ai - is an affine transform matrix from skew_img to img
'''
h, w = img.shape[:2]
if mask is None:
mask = np.zeros((h, w), np.uint8)
mask[:] = 255
A = np.float32([[1, 0, 0], [0, 1, 0]])
if phi != 0.0:
phi = np.deg2rad(phi)
s, c = np.sin(phi), np.cos(phi)
A = np.float32([[c,-s], [ s, c]])
corners = [[0, 0], [w, 0], [w, h], [0, h]]
tcorners = np.int32( np.dot(corners, A.T) )
x, y, w, h = cv.boundingRect(tcorners.reshape(1,-1,2))
A = np.hstack([A, [[-x], [-y]]])
img = cv.warpAffine(img, A, (w, h), flags=cv.INTER_LINEAR, borderMode=cv.BORDER_REPLICATE)
if tilt != 1.0:
s = 0.8*np.sqrt(tilt*tilt-1)
img = cv.GaussianBlur(img, (0, 0), sigmaX=s, sigmaY=0.01)
img = cv.resize(img, (0, 0), fx=1.0/tilt, fy=1.0, interpolation=cv.INTER_NEAREST)
A[0] /= tilt
if phi != 0.0 or tilt != 1.0:
h, w = img.shape[:2]
mask = cv.warpAffine(mask, A, (w, h), flags=cv.INTER_NEAREST)
Ai = cv.invertAffineTransform(A)
return img, mask, Ai
def affine_detect(detector, img, mask=None, pool=None):
'''
affine_detect(detector, img, mask=None, pool=None) -> keypoints, descrs
Apply a set of affine transformations to the image, detect keypoints and
reproject them into initial image coordinates.
See http://www.ipol.im/pub/algo/my_affine_sift/ for the details.
ThreadPool object may be passed to speedup the computation.
'''
params = [(1.0, 0.0)]
for t in 2**(0.5*np.arange(1,6)):
for phi in np.arange(0, 180, 72.0 / t):
params.append((t, phi))
def f(p):
t, phi = p
timg, tmask, Ai = affine_skew(t, phi, img)
keypoints, descrs = detector.detectAndCompute(timg, tmask)
for kp in keypoints:
x, y = kp.pt
kp.pt = tuple( np.dot(Ai, (x, y, 1)) )
if descrs is None:
descrs = []
return keypoints, descrs
keypoints, descrs = [], []
if pool is None:
ires = it.imap(f, params)
else:
ires = pool.imap(f, params)
for i, (k, d) in enumerate(ires):
print('affine sampling: %d / %d\r' % (i+1, len(params)), end='')
keypoints.extend(k)
descrs.extend(d)
print()
return keypoints, np.array(descrs)
class LensDistortion(object):
def __init__(self, coeffs={}):
# SAVED CALIBRATION RESULTS
self._coeffs = coeffs
# SAVED CALIBRATION SETTINGS
self.opts = {}
self.mapx, self.mapy = None, None
self.newCameraMatrix = None
def setCameraParams(self, fx, fy, cx, cy, k1, k2, k3, p1, p2):
c = self._coeffs['cameraMatrix'] = np.zeros(shape=(3, 3))
c[0, 0] = fx
c[1, 1] = fy
c[0, 2] = cx
c[1, 2] = cy
c[2, 2] = 1
self._coeffs['distortionCoeffs'] = np.array([[k1, k2, p1, p2, k3]])
def getUndistortRectifyMap(self, imgWidth, imgHeight):
if self.mapx is not None and self.mapx.shape == (imgHeight, imgWidth):
return self.mapx, self.mapy
cam = self._coeffs['cameraMatrix']
d = self._coeffs['distortionCoeffs']
(newCameraMatrix, self.roi) = cv.getOptimalNewCameraMatrix(cam,
d, (imgWidth,
imgHeight), 1,
(imgWidth, imgHeight))
self.newCameraMatrix = newCameraMatrix
self.mapx, self.mapy = cv.initUndistortRectifyMap(cam,
d, None, newCameraMatrix,
(imgWidth, imgHeight), cv.CV_32FC1)
return self.mapx, self.mapy
def getDistortRectifyMap(self, sizex, sizey):
posy, posx = np.mgrid[0:sizey, 0:sizex].astype(np.float32)
mapx, mapy = self.getUndistortRectifyMap(sizex, sizey)
dx = posx - mapx
dy = posy - mapy
posx += dx
posy += dy
return posx, posy
def distortImage(self, image):
'''
opposite of 'correct'
'''
(imgHeight, imgWidth) = image.shape[:2]
mapx, mapy = self.getDistortRectifyMap(imgWidth, imgHeight)
return cv.remap(image, mapx, mapy, cv.INTER_LINEAR,
borderValue=(0, 0, 0))
def showme(dst, name):
import matplotlib.pyplot as plt
plt.figure()
plt.title(name)
plt.imshow(dst)
plt.show()
def main():
# img1 = cv2.imread("./save_ply/1_IMG_Texture_8Bit.png", -1)
import sys, getopt
opts, args = getopt.getopt(sys.argv[1:], '', ['feature='])
# opts = dict(opts)
# feature_name = opts.get('--feature', 'brisk-flann')
feature_name = 'sift'
try:
fn1, fn2 = args
except:
#fn1 = "./save_ply/1_IMG_Texture_8Bit.png"
#fn2 = "./save_ply/7_IMG_coeffsTexture_8Bit.png"
fn1 = "./save_ply/11_IMG_Texture_8Bit.png"
fn2 = "./save_ply/22_IMG_Texture_8Bit.png"
#fn1 = "./save_ply/img1.ppm"
#fn2 = "./save_ply/img6.ppm"
l = LensDistortion()
img11 = cv.imread(fn1, cv.IMREAD_GRAYSCALE)
img22 = cv.imread(fn2, cv.IMREAD_GRAYSCALE)
showme(img11, "img1")
showme(img22, "img2")
l.setCameraParams(2269.16, 2268.4, 1065.54, 799.032, -0.121994, 0.154463, -0.0307676, 0.000367495, -0.000926385)
#img1 = l.distortImage(img11)
#img2 = l.distortImage(img22)
img1 = img11
img2 = img22
showme(img1, "distimg1")
showme(img2, "distimg2")
x, y = img1.shape[0:2]
#img1 = cv.resize(img1, (int(y / 2), int(x / 2)))
#img2 = cv.resize(img2, (int(y / 2), int(x / 2)))
#img1 = cv.imread(fn1, -1)
#img2 = cv.imread(fn2, -1)
#img1 = cv.cvtColor(img1, cv.COLOR_BGR2GRAY)
#img1 = cv.cvtColor(img1, cv.COLOR_BGR2GRAY)
# img1 = np.ones_like(img1_)
# img2 = np.ones_like(img2_)
# img1 = cv.resize(img1_,(500,800,3),img1)
# img2 = cv.resize(img1_,(500,800,3),img2)
detector, matcher = init_feature(feature_name)
if img1 is None:
print('Failed to load fn1:', fn1)
sys.exit(1)
if img2 is None:
print('Failed to load fn2:', fn2)
sys.exit(1)
if detector is None:
print('unknown feature:', feature_name)
sys.exit(1)
print('using', feature_name)
pool=ThreadPool(processes = cv.getNumberOfCPUs())
kp1, desc1 = affine_detect(detector, img1, pool=pool)
kp2, desc2 = affine_detect(detector, img2, pool=pool)
print('img1 - %d features, img2 - %d features' % (len(kp1), len(kp2)))
def match_and_draw(win):
with Timer('matching'):
raw_matches = matcher.knnMatch(desc1, trainDeors = desc2, k = 2) #2
p1, p2, kp_pairs = filter_matches(kp1, kp2, raw_matches)
if len(p1) >= 4:
H, status = cv.findHomography(p1, p2, cv.RANSAC, 20.0)
print('%d / %d inliers/matched' % (np.sum(status), len(status)))
# do not draw outliers (there will be a lot of them)
kp_pairs = [kpp for kpp, flag in zip(kp_pairs, status) if flag]
else:
H, status = None, None
print('%d matches found, not enough for homography estimation' % len(p1))
explore_match(win, img1, img2, kp_pairs, None, H, l.newCameraMatrix)
match_and_draw('affine find_obj')
cv.waitKey()
print('Done')
if __name__ == '__main__':
print(__doc__)
main()
cv.destroyAllWindows()'''
Feature-based image matching sample.
Note, that you will need the https://github.com/opencv/opencv_contrib repo for SIFT and SURF
USAGE
find_obj.py [--feature=<sift|surf|orb|akaze|brisk>[-flann]] [ <image1> <image2> ]
--feature - Feature to use. Can be sift, surf, orb or brisk. Append '-flann'
to feature name to use Flann-based matcher instead bruteforce.
Press left mouse button on a feature point to see its matching point.
'''
# Python 2/3 compatibility
from __future__ import print_function
import numpy as np
import cv2 as cv
from common import anorm, getsize
FLANN_INDEX_KDTREE = 1 # bug: flann enums are missing
FLANN_INDEX_LSH = 6
def init_feature(name):
chunks = name.split('-')
if chunks[0] == 'sift':
detector = cv.xfeatures2d.SIFT_create()
norm = cv.NORM_L2
elif chunks[0] == 'surf':
detector = cv.xfeatures2d.SURF_create(800)
norm = cv.NORM_L2
elif chunks[0] == 'orb':
detector = cv.ORB_create(400)
norm = cv.NORM_HAMMING
elif chunks[0] == 'akaze':
detector = cv.AKAZE_create()
norm = cv.NORM_HAMMING
elif chunks[0] == 'brisk':
detector = cv.BRISK_create()
norm = cv.NORM_HAMMING
else:
return None, None
if 'flann' in chunks:
if norm == cv.NORM_L2:
flann_params = dict(algorithm = FLANN_INDEX_KDTREE, trees = 5)
else:
flann_params= dict(algorithm = FLANN_INDEX_LSH,
table_number = 6, # 12
key_size = 12, # 20
multi_probe_level = 1) #2
matcher = cv.FlannBasedMatcher(flann_params, {}) # bug : need to pass empty dict (#1329)
else:
matcher = cv.BFMatcher(norm)
return detector, matcher
def filter_matches(kp1, kp2, matches, ratio = 0.75):
mkp1, mkp2 = [], []
for m in matches:
if len(m) == 2 and m[0].distance < m[1].distance * ratio:
m = m[0]
mkp1.append( kp1[m.queryIdx] )
mkp2.append( kp2[m.trainIdx] )
p1 = np.float32([kp.pt for kp in mkp1])
p2 = np.float32([kp.pt for kp in mkp2])
kp_pairs = zip(mkp1, mkp2)
return p1, p2, list(kp_pairs)
def explore_match(win, img1, img2, kp_pairs, status = None, H = None, newCameraMatrix=None):
h1, w1 = img1.shape[:2]
h2, w2 = img2.shape[:2]
vis = np.zeros((max(h1, h2), w1+w2), np.uint8)
vis[:h1, :w1] = img1
vis[:h2, w1:w1+w2] = img2
vis = cv.cvtColor(vis, cv.COLOR_GRAY2BGR)
if H is not None:
corners = np.float32([[0, 0], [w1, 0], [w1, h1], [0, h1]])
corners = np.int32( cv.perspectiveTransform(corners.reshape(1, -1, 2), H).reshape(-1, 2) + (w1, 0) )
cv.polylines(vis, [corners], True, (255, 255, 255))
if status is None:
status = np.ones(len(kp_pairs), np.bool_)
p1, p2 = [], [] # python 2 / python 3 change of zip unpacking
newp1, newp2 = [], []
for kpp in kp_pairs:
p1.append(np.int32(kpp[0].pt))
newp1.append(np.int32(kpp[0].pt))
p2.append(np.int32(np.array(kpp[1].pt) + [w1, 0]))
newp2.append(np.int32(np.array(kpp[1].pt)))
'''
(k1, k2, p1, p2[, k3[, k4, k5, k6[, s1, s2, s3, s4[, tx, ty]]]])
(-0.121994, 0.154463, 0.000367495, -0.000926385[, -0.0307676[, 0, 0, 0[, 0, 0, 0, 0[, 0, 0]]]])
'''
#https://www.cnblogs.com/riddick/p/7811877.html
#https://answers.opencv.org/question/189490/stereo-re-calibration-using-opencvs-findessentialmat-recoverpose/
#https://answers.opencv.org/question/104134/translation-vector-upto-a-scale-factor-odometry/
#https://dsp.stackexchange.com/questions/25971/how-are-the-scaling-parameters-included-extracted-from-an-essential-matrix
intrinsics = [[2269.16, 0., 1065.54], [0., 2268.4, 799.032], [0., 0., 1.]]
K0 = np.array(intrinsics)
#newCameraMatrix = np.array(newCameraMatrix)
newCameraMatrix = K0
import cv2
retval, mask = cv2.findEssentialMat(np.array(newp1), np.array(newp2), newCameraMatrix, method=cv2.RANSAC, threshold=20)
NN, R, t, _ = cv2.recoverPose(retval, np.array(newp1), np.array(newp2), newCameraMatrix, mask=mask)
print(R)
print(t)
dep1 = cv2.imread("./save_ply/11_IMG_DepthMap.tif", -1)
dep2 = cv2.imread("./save_ply/22_IMG_DepthMap.tif", -1)
trp1 = []
trp2 = []
for key, ((x1, y1), (x2, y2)) in enumerate(zip(newp1, newp2)):
left_d = dep1[y1][x1]
left_z = float(left_d) / newCameraMatrix[2][2]
left_x = (x1 - newCameraMatrix[0][2]) * left_z / newCameraMatrix[0][0]
left_y = (y1 - newCameraMatrix[1][2]) * left_z / newCameraMatrix[1][1]
points1 = np.array([left_x, left_y, left_z])
flag1 = (np.sum(abs(points1))<0.001)
right_d = dep2[y2][x2]
right_z = float(right_d) / newCameraMatrix[2][2]
right_x = (x2 - newCameraMatrix[0][2]) * right_z / newCameraMatrix[0][0]
right_y = (y2 - newCameraMatrix[1][2]) * right_z / newCameraMatrix[1][1]
points2 = np.array([right_x, right_y, right_z])
flag2 = (np.sum(abs(points2)) < 0.001)
if mask[key]==True and flag1==False and flag2==False:
#if flag1 == False and flag2 == False:
trp1.append(points1)
trp2.append(points2)
a = 1
def best_fit_transform(A, B):
'''
Calculates the least-squares best-fit transform that maps corresponding points A to B in m spatial dimensions
Input:
A: Nxm numpy array of corresponding points
B: Nxm numpy array of corresponding points
Returns:
T: (m+1)x(m+1) homogeneous transformation matrix that maps A on to B
R: mxm rotation matrix
t: mx1 translation vector
'''
from sklearn.neighbors import NearestNeighbors
assert A.shape == B.shape
# get number of dimensions
m = A.shape[1]
# translate points to their centroids
centroid_A = np.mean(A, axis=0)
centroid_B = np.mean(B, axis=0)
AA = A - centroid_A
BB = B - centroid_B
# rotation matrix
H = np.dot(AA.T, BB)
U, S, Vt = np.linalg.svd(H)
R = np.dot(Vt.T, U.T)
# special reflection case
if np.linalg.det(R) < 0:
Vt[m - 1, :] *= -1
R = np.dot(Vt.T, U.T)
# translation
t = centroid_B.T - np.dot(R, centroid_A.T)
# homogeneous transformation
T = np.identity(m + 1)
T[:m, :m] = R
T[:m, m] = t
return T, R, t
newtrp1 = np.array(trp1)
newtrp2 = np.array(trp2)
T, R, t = best_fit_transform(newtrp1, newtrp2)
print(R.astype(np.float16))
print(t.astype(np.float16))
green = (0, 255, 0)
red = (0, 0, 255)
kp_color = (51, 103, 236)
for (x1, y1), (x2, y2), inlier in zip(p1, p2, status):
if inlier:
col = green
cv.circle(vis, (x1, y1), 2, col, -1)
cv.circle(vis, (x2, y2), 2, col, -1)
else:
col = red
r = 2
thickness = 3
cv.line(vis, (x1-r, y1-r), (x1+r, y1+r), col, thickness)
cv.line(vis, (x1-r, y1+r), (x1+r, y1-r), col, thickness)
cv.line(vis, (x2-r, y2-r), (x2+r, y2+r), col, thickness)
cv.line(vis, (x2-r, y2+r), (x2+r, y2-r), col, thickness)
vis0 = vis.copy()
for (x1, y1), (x2, y2), inlier in zip(p1, p2, status):
if inlier:
cv.line(vis, (x1, y1), (x2, y2), green)
cv.imshow(win, vis)
cv.imwrite("./save_ply/22.png", vis)
def onmouse(event, x, y, flags, param):
cur_vis = vis
if flags & cv.EVENT_FLAG_LBUTTON:
cur_vis = vis0.copy()
r = 8
m = (anorm(np.array(p1) - (x, y)) < r) | (anorm(np.array(p2) - (x, y)) < r)
idxs = np.where(m)[0]
kp1s, kp2s = [], []
for i in idxs:
(x1, y1), (x2, y2) = p1[i], p2[i]
col = (red, green)[status[i][0]]
cv.line(cur_vis, (x1, y1), (x2, y2), col)
kp1, kp2 = kp_pairs[i]
kp1s.append(kp1)
kp2s.append(kp2)
cur_vis = cv.drawKeypoints(cur_vis, kp1s, None, flags=4, color=kp_color)
cur_vis[:,w1:] = cv.drawKeypoints(cur_vis[:,w1:], kp2s, None, flags=4, color=kp_color)
cv.imshow(win, cur_vis)
cv.setMouseCallback(win, onmouse)
import matplotlib.pyplot as plt
def showimg(dst, name):
plt.figure()
plt.title(name)
plt.imshow(dst)
plt.show()
showimg(vis, "result")
return vis
def main():
import sys, getopt
opts, args = getopt.getopt(sys.argv[1:], '', ['feature='])
opts = dict(opts)
feature_name = opts.get('--feature', 'brisk')
try:
fn1, fn2 = args
except:
fn1 = 'box.png'
fn2 = 'box_in_scene.png'
img1 = cv.imread(cv.samples.findFile(fn1), cv.IMREAD_GRAYSCALE)
img2 = cv.imread(cv.samples.findFile(fn2), cv.IMREAD_GRAYSCALE)
detector, matcher = init_feature(feature_name)
if img1 is None:
print('Failed to load fn1:', fn1)
sys.exit(1)
if img2 is None:
print('Failed to load fn2:', fn2)
sys.exit(1)
if detector is None:
print('unknown feature:', feature_name)
sys.exit(1)
print('using', feature_name)
kp1, desc1 = detector.detectAndCompute(img1, None)
kp2, desc2 = detector.detectAndCompute(img2, None)
print('img1 - %d features, img2 - %d features' % (len(kp1), len(kp2)))
def match_and_draw(win):
print('matching...')
raw_matches = matcher.knnMatch(desc1, trainDeors = desc2, k = 2) #2
p1, p2, kp_pairs = filter_matches(kp1, kp2, raw_matches)
if len(p1) >= 4:
H, status = cv.findHomography(p1, p2, cv.RANSAC, 5.0)
print('%d / %d inliers/matched' % (np.sum(status), len(status)))
else:
H, status = None, None
print('%d matches found, not enough for homography estimation' % len(p1))
_vis = explore_match(win, img1, img2, kp_pairs, status, H)
match_and_draw('find_obj')
cv.waitKey()
print('Done')
if __name__ == '__main__':
print(__doc__)
main()
cv.destroyAllWindows()匹配多组：
common.py
'''
This module contains some common routines used by other samples.
'''
# Python 2/3 compatibility
from __future__ import print_function
import sys
PY3 = sys.version_info[0] == 3
if PY3:
from functools import reduce
import numpy as np
import cv2 as cv
# built-in modules
import os
import itertools as it
from contextlib import contextmanager
image_extensions = ['.bmp', '.jpg', '.jpeg', '.png', '.tif', '.tiff', '.pbm', '.pgm', '.ppm']
class Bunch(object):
def __init__(self, **kw):
self.__dict__.update(kw)
def __str__(self):
return str(self.__dict__)
def splitfn(fn):
path, fn = os.path.split(fn)
name, ext = os.path.splitext(fn)
return path, name, ext
def anorm2(a):
return (a*a).sum(-1)
def anorm(a):
return np.sqrt( anorm2(a) )
def homotrans(H, x, y):
xs = H[0, 0]*x + H[0, 1]*y + H[0, 2]
ys = H[1, 0]*x + H[1, 1]*y + H[1, 2]
s = H[2, 0]*x + H[2, 1]*y + H[2, 2]
return xs/s, ys/s
def to_rect(a):
a = np.ravel(a)
if len(a) == 2:
a = (0, 0, a[0], a[1])
return np.array(a, np.float64).reshape(2, 2)
def rect2rect_mtx(src, dst):
src, dst = to_rect(src), to_rect(dst)
cx, cy = (dst[1] - dst[0]) / (src[1] - src[0])
tx, ty = dst[0] - src[0] * (cx, cy)
M = np.float64([[ cx, 0, tx],
[ 0, cy, ty],
[ 0, 0, 1]])
return M
def lookat(eye, target, up = (0, 0, 1)):
fwd = np.asarray(target, np.float64) - eye
fwd /= anorm(fwd)
right = np.cross(fwd, up)
right /= anorm(right)
down = np.cross(fwd, right)
R = np.float64([right, down, fwd])
tvec = -np.dot(R, eye)
return R, tvec
def mtx2rvec(R):
w, u, vt = cv.SVDecomp(R - np.eye(3))
p = vt[0] + u[:,0]*w[0] # same as np.dot(R, vt[0])
c = np.dot(vt[0], p)
s = np.dot(vt[1], p)
axis = np.cross(vt[0], vt[1])
return axis * np.arctan2(s, c)
def draw_str(dst, target, s):
x, y = target
cv.putText(dst, s, (x+1, y+1), cv.FONT_HERSHEY_PLAIN, 1.0, (0, 0, 0), thickness = 2, lineType=cv.LINE_AA)
cv.putText(dst, s, (x, y), cv.FONT_HERSHEY_PLAIN, 1.0, (255, 255, 255), lineType=cv.LINE_AA)
class Sketcher:
def __init__(self, windowname, dests, colors_func):
self.prev_pt = None
self.windowname = windowname
self.dests = dests
self.colors_func = colors_func
self.dirty = False
self.show()
cv.setMouseCallback(self.windowname, self.on_mouse)
def show(self):
cv.imshow(self.windowname, self.dests[0])
def on_mouse(self, event, x, y, flags, param):
pt = (x, y)
if event == cv.EVENT_LBUTTONDOWN:
self.prev_pt = pt
elif event == cv.EVENT_LBUTTONUP:
self.prev_pt = None
if self.prev_pt and flags & cv.EVENT_FLAG_LBUTTON:
for dst, color in zip(self.dests, self.colors_func()):
cv.line(dst, self.prev_pt, pt, color, 5)
self.dirty = True
self.prev_pt = pt
self.show()
# palette data from matplotlib/_cm.py
_jet_data = {'red': ((0., 0, 0), (0.35, 0, 0), (0.66, 1, 1), (0.89,1, 1),
(1, 0.5, 0.5)),
'green': ((0., 0, 0), (0.125,0, 0), (0.375,1, 1), (0.64,1, 1),
(0.91,0,0), (1, 0, 0)),
'blue': ((0., 0.5, 0.5), (0.11, 1, 1), (0.34, 1, 1), (0.65,0, 0),
(1, 0, 0))}
cmap_data = { 'jet' : _jet_data }
def make_cmap(name, n=256):
data = cmap_data[name]
xs = np.linspace(0.0, 1.0, n)
channels = []
eps = 1e-6
for ch_name in ['blue', 'green', 'red']:
ch_data = data[ch_name]
xp, yp = [], []
for x, y1, y2 in ch_data:
xp += [x, x+eps]
yp += [y1, y2]
ch = np.interp(xs, xp, yp)
channels.append(ch)
return np.uint8(np.array(channels).T*255)
def nothing(*arg, **kw):
pass
def clock():
return cv.getTickCount() / cv.getTickFrequency()
@contextmanager
def Timer(msg):
print(msg, '...',)
start = clock()
try:
yield
finally:
print("%.2f ms" % ((clock()-start)*1000))
class StatValue:
def __init__(self, smooth_coef = 0.5):
self.value = None
self.smooth_coef = smooth_coef
def update(self, v):
if self.value is None:
self.value = v
else:
c = self.smooth_coef
self.value = c * self.value + (1.0-c) * v
class RectSelector:
def __init__(self, win, callback):
self.win = win
self.callback = callback
cv.setMouseCallback(win, self.onmouse)
self.drag_start = None
self.drag_rect = None
def onmouse(self, event, x, y, flags, param):
x, y = np.int16([x, y]) # BUG
if event == cv.EVENT_LBUTTONDOWN:
self.drag_start = (x, y)
return
if self.drag_start:
if flags & cv.EVENT_FLAG_LBUTTON:
xo, yo = self.drag_start
x0, y0 = np.minimum([xo, yo], [x, y])
x1, y1 = np.maximum([xo, yo], [x, y])
self.drag_rect = None
if x1-x0 > 0 and y1-y0 > 0:
self.drag_rect = (x0, y0, x1, y1)
else:
rect = self.drag_rect
self.drag_start = None
self.drag_rect = None
if rect:
self.callback(rect)
def draw(self, vis):
if not self.drag_rect:
return False
x0, y0, x1, y1 = self.drag_rect
cv.rectangle(vis, (x0, y0), (x1, y1), (0, 255, 0), 2)
return True
@property
def dragging(self):
return self.drag_rect is not None
def grouper(n, iterable, fillvalue=None):
'''grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx'''
args = [iter(iterable)] * n
if PY3:
output = it.zip_longest(fillvalue=fillvalue, *args)
else:
output = it.izip_longest(fillvalue=fillvalue, *args)
return output
def mosaic(w, imgs):
'''Make a grid from images.
w -- number of grid columns
imgs -- images (must have same size and format)
'''
imgs = iter(imgs)
if PY3:
img0 = next(imgs)
else:
img0 = imgs.next()
pad = np.zeros_like(img0)
imgs = it.chain([img0], imgs)
rows = grouper(w, imgs, pad)
return np.vstack(map(np.hstack, rows))
def getsize(img):
h, w = img.shape[:2]
return w, h
def mdot(*args):
return reduce(np.dot, args)
def draw_keypoints(vis, keypoints, color = (0, 255, 255)):
for kp in keypoints:
x, y = kp.pt
cv.circle(vis, (int(x), int(y)), 2, color)find_obj.py
'''
Feature-based image matching sample.
Note, that you will need the https://github.com/opencv/opencv_contrib repo for SIFT and SURF
USAGE
find_obj.py [--feature=<sift|surf|orb|akaze|brisk>[-flann]] [ <image1> <image2> ]
--feature - Feature to use. Can be sift, surf, orb or brisk. Append '-flann'
to feature name to use Flann-based matcher instead bruteforce.
Press left mouse button on a feature point to see its matching point.
'''
# Python 2/3 compatibility
from __future__ import print_function
import numpy as np
import cv2 as cv
from common import anorm, getsize
FLANN_INDEX_KDTREE = 1 # bug: flann enums are missing
FLANN_INDEX_LSH = 6
def init_feature(name):
chunks = name.split('-')
if chunks[0] == 'sift':
detector = cv.xfeatures2d.SIFT_create()
norm = cv.NORM_L2
elif chunks[0] == 'surf':
detector = cv.xfeatures2d.SURF_create(800)
norm = cv.NORM_L2
elif chunks[0] == 'orb':
detector = cv.ORB_create(400)
norm = cv.NORM_HAMMING
elif chunks[0] == 'akaze':
detector = cv.AKAZE_create()
norm = cv.NORM_HAMMING
elif chunks[0] == 'brisk':
detector = cv.BRISK_create()
norm = cv.NORM_HAMMING
else:
return None, None
if 'flann' in chunks:
if norm == cv.NORM_L2:
flann_params = dict(algorithm = FLANN_INDEX_KDTREE, trees = 5)
else:
flann_params= dict(algorithm = FLANN_INDEX_LSH,
table_number = 6, # 12
key_size = 12, # 20
multi_probe_level = 1) #2
matcher = cv.FlannBasedMatcher(flann_params, {}) # bug : need to pass empty dict (#1329)
else:
matcher = cv.BFMatcher(norm)
return detector, matcher
def filter_matches(kp1, kp2, matches, ratio = 0.75):
mkp1, mkp2 = [], []
for m in matches:
if len(m) == 2 and m[0].distance < m[1].distance * ratio:
m = m[0]
mkp1.append( kp1[m.queryIdx] )
mkp2.append( kp2[m.trainIdx] )
p1 = np.float32([kp.pt for kp in mkp1])
p2 = np.float32([kp.pt for kp in mkp2])
kp_pairs = zip(mkp1, mkp2)
return p1, p2, list(kp_pairs)
def best_fit_transform(A, B):
'''
Calculates the least-squares best-fit transform that maps corresponding points A to B in m spatial dimensions
Input:
A: Nxm numpy array of corresponding points
B: Nxm numpy array of corresponding points
Returns:
T: (m+1)x(m+1) homogeneous transformation matrix that maps A on to B
R: mxm rotation matrix
t: mx1 translation vector
'''
from sklearn.neighbors import NearestNeighbors
assert A.shape == B.shape
# get number of dimensions
m = A.shape[1]
# translate points to their centroids
centroid_A = np.mean(A, axis=0)
centroid_B = np.mean(B, axis=0)
AA = A - centroid_A
BB = B - centroid_B
# rotation matrix
H = np.dot(AA.T, BB)
U, S, Vt = np.linalg.svd(H)
R = np.dot(Vt.T, U.T)
# special reflection case
if np.linalg.det(R) < 0:
Vt[m - 1, :] *= -1
R = np.dot(Vt.T, U.T)
# translation
t = centroid_B.T - np.dot(R, centroid_A.T)
# homogeneous transformation
T = np.identity(m + 1)
T[:m, :m] = R
T[:m, m] = t
return T, R, t
def explore_match(img1, img2, dep1, dep2, name1, name2, kp_pairs, status = None, H = None):
h1, w1 = img1.shape[:2]
h2, w2 = img2.shape[:2]
vis = np.zeros((max(h1, h2), w1+w2), np.uint8)
vis[:h1, :w1] = img1
vis[:h2, w1:w1+w2] = img2
vis = cv.cvtColor(vis, cv.COLOR_GRAY2BGR)
if H is not None:
corners = np.float32([[0, 0], [w1, 0], [w1, h1], [0, h1]])
corners = np.int32( cv.perspectiveTransform(corners.reshape(1, -1, 2), H).reshape(-1, 2) + (w1, 0) )
cv.polylines(vis, [corners], True, (255, 255, 255))
if status is None:
status = np.ones(len(kp_pairs), np.bool_)
p1, p2 = [], [] # python 2 / python 3 change of zip unpacking
newp1, newp2 = [], []
for kpp in kp_pairs:
p1.append(np.int32(kpp[0].pt))
newp1.append(np.int32(kpp[0].pt))
p2.append(np.int32(np.array(kpp[1].pt) + [w1, 0]))
newp2.append(np.int32(np.array(kpp[1].pt)))
intrinsics = [[2269.16, 0., 1065.54], [0., 2268.4, 799.032], [0., 0., 1.]]
K0 = np.array(intrinsics)
newCameraMatrix = K0
retval, mask = cv.findEssentialMat(np.array(newp1), np.array(newp2), newCameraMatrix, method=cv.RANSAC, threshold=20)
trp1 = []
trp2 = []
for key, ((x1, y1), (x2, y2)) in enumerate(zip(newp1, newp2)):
left_d = dep1[y1][x1]
left_z = float(left_d) / newCameraMatrix[2][2]
left_x = (x1 - newCameraMatrix[0][2]) * left_z / newCameraMatrix[0][0]
left_y = (y1 - newCameraMatrix[1][2]) * left_z / newCameraMatrix[1][1]
points1 = np.array([left_x, left_y, left_z])
flag1 = (np.sum(abs(points1))<0.001)
right_d = dep2[y2][x2]
right_z = float(right_d) / newCameraMatrix[2][2]
right_x = (x2 - newCameraMatrix[0][2]) * right_z / newCameraMatrix[0][0]
right_y = (y2 - newCameraMatrix[1][2]) * right_z / newCameraMatrix[1][1]
points2 = np.array([right_x, right_y, right_z])
flag2 = (np.sum(abs(points2)) < 0.001)
if mask[key]==True and flag1==False and flag2==False:
trp1.append(points1)
trp2.append(points2)
newtrp1 = np.array(trp1)
newtrp2 = np.array(trp2)
if len(newtrp1) < 20:
return
T, R, t = best_fit_transform(newtrp1, newtrp2)
writeR = R.reshape((9,))
writet = t.reshape((3,))
writeRT = np.concatenate((writeR,writet),axis=0)
file_write_obj = open("./RT_txt/"+name1+"_split_"+name2+".txt", 'w')
for var in writeRT:
file_write_obj.writelines(str(var))
file_write_obj.write('\n')
file_write_obj.close()
green = (0, 255, 0)
red = (0, 0, 255)
kp_color = (51, 103, 236)
for (x1, y1), (x2, y2), inlier in zip(p1, p2, status):
if inlier:
col = green
cv.circle(vis, (x1, y1), 2, col, -1)
cv.circle(vis, (x2, y2), 2, col, -1)
else:
col = red
r = 2
thickness = 3
cv.line(vis, (x1-r, y1-r), (x1+r, y1+r), col, thickness)
cv.line(vis, (x1-r, y1+r), (x1+r, y1-r), col, thickness)
cv.line(vis, (x2-r, y2-r), (x2+r, y2+r), col, thickness)
cv.line(vis, (x2-r, y2+r), (x2+r, y2-r), col, thickness)
for (x1, y1), (x2, y2), inlier in zip(p1, p2, status):
if inlier:
cv.line(vis, (x1, y1), (x2, y2), green)
cv.imwrite("./pairs_save_image/"+name1+"_split_"+name2+".jpg", vis)pairs_list.txt?
1,2,3
4,5,6,7,8,9,10,11,12,13,14,15,16
17,18,19,20,21,22,23,24,25,26,27
28,29,30,31,32,33
34,35,36,37,38,39,40
41,42,43,44,45,46,47,48,49,50,51,52,53,54
55,56,57,58,59,60
61,62,63,64,65
66,67,68,69,70,71,74,73,75,76,77,78,79,80,81,84,85,86,82,83asift.py
'''
Affine invariant feature-based image matching sample.
This sample is similar to find_obj.py, but uses the affine transformation
space sampling technique, called ASIFT [1]. While the original implementation
is based on SIFT, you can try to use SURF or ORB detectors instead. Homography RANSAC
is used to reject outliers. Threading is used for faster affine sampling.
[1] http://www.ipol.im/pub/algo/my_affine_sift/
USAGE
asift.py [--feature=<sift|surf|orb|brisk>[-flann]] [ <image1> <image2> ]
--feature - Feature to use. Can be sift, surf, orb or brisk. Append '-flann'
to feature name to use Flann-based matcher instead bruteforce.
Press left mouse button on a feature point to see its matching point.
'''
# Python 2/3 compatibility
from __future__ import print_function
import numpy as np
import cv2 as cv
import os
# built-in modules
import itertools as it
from multiprocessing.pool import ThreadPool
# local modules
from common import Timer
from find_obj import init_feature, filter_matches, explore_match
def affine_skew(tilt, phi, img, mask=None):
'''
affine_skew(tilt, phi, img, mask=None) -> skew_img, skew_mask, Ai
Ai - is an affine transform matrix from skew_img to img
'''
h, w = img.shape[:2]
if mask is None:
mask = np.zeros((h, w), np.uint8)
mask[:] = 255
A = np.float32([[1, 0, 0], [0, 1, 0]])
if phi != 0.0:
phi = np.deg2rad(phi)
s, c = np.sin(phi), np.cos(phi)
A = np.float32([[c,-s], [ s, c]])
corners = [[0, 0], [w, 0], [w, h], [0, h]]
tcorners = np.int32( np.dot(corners, A.T) )
x, y, w, h = cv.boundingRect(tcorners.reshape(1,-1,2))
A = np.hstack([A, [[-x], [-y]]])
img = cv.warpAffine(img, A, (w, h), flags=cv.INTER_LINEAR, borderMode=cv.BORDER_REPLICATE)
if tilt != 1.0:
s = 0.8*np.sqrt(tilt*tilt-1)
img = cv.GaussianBlur(img, (0, 0), sigmaX=s, sigmaY=0.01)
img = cv.resize(img, (0, 0), fx=1.0/tilt, fy=1.0, interpolation=cv.INTER_NEAREST)
A[0] /= tilt
if phi != 0.0 or tilt != 1.0:
h, w = img.shape[:2]
mask = cv.warpAffine(mask, A, (w, h), flags=cv.INTER_NEAREST)
Ai = cv.invertAffineTransform(A)
return img, mask, Ai
def affine_detect(detector, img, mask=None, pool=None):
'''
affine_detect(detector, img, mask=None, pool=None) -> keypoints, descrs
Apply a set of affine transformations to the image, detect keypoints and
reproject them into initial image coordinates.
See http://www.ipol.im/pub/algo/my_affine_sift/ for the details.
ThreadPool object may be passed to speedup the computation.
'''
params = [(1.0, 0.0)]
for t in 2**(0.5*np.arange(1,6)):
for phi in np.arange(0, 180, 72.0 / t):
params.append((t, phi))
def f(p):
t, phi = p
timg, tmask, Ai = affine_skew(t, phi, img)
keypoints, descrs = detector.detectAndCompute(timg, tmask)
for kp in keypoints:
x, y = kp.pt
kp.pt = tuple( np.dot(Ai, (x, y, 1)) )
if descrs is None:
descrs = []
return keypoints, descrs
keypoints, descrs = [], []
if pool is None:
ires = it.imap(f, params)
else:
ires = pool.imap(f, params)
for i, (k, d) in enumerate(ires):
print('affine sampling: %d / %d\r' % (i+1, len(params)), end='')
keypoints.extend(k)
descrs.extend(d)
print()
return keypoints, np.array(descrs)
def main():
feature_name = 'sift'
mypath = "./11-14-tif"
if not os.path.exists("./pairs_save_image"):
os.makedirs("./pairs_save_image")
if not os.path.exists("./RT_txt"):
os.makedirs("./RT_txt")
detector, matcher = init_feature(feature_name)
print('using', feature_name)
print(cv.getNumberOfCPUs())
pool=ThreadPool(processes = cv.getNumberOfCPUs())
import shutil
with open("pairs_list.txt") as files:
for line in files:
line_t = line.replace('\n','').split(',')
for key1 in range(len(line_t)-1):
name = str(line_t[key1]) + "_IMG_Texture_8Bit_split_" + str(line_t[key1+1]) + "_IMG_Texture_8Bit.jpg"
img1 = cv.imread(os.path.join(mypath,str(line_t[key1])+"_IMG_Texture_8Bit.png"), cv.IMREAD_GRAYSCALE)
dep1 = cv.imread(os.path.join(mypath,str(line_t[key1])+"_IMG_DepthMap.tif"), -1)
img2 = cv.imread(os.path.join(mypath,str(line_t[key1+1])+"_IMG_Texture_8Bit.png"), cv.IMREAD_GRAYSCALE)
dep2 = cv.imread(os.path.join(mypath,str(line_t[key1+1])+"_IMG_DepthMap.tif"), -1)
kp1, desc1 = affine_detect(detector, img1, pool=pool)
kp2, desc2 = affine_detect(detector, img2, pool=pool)
name1 = str(line_t[key1])+"_IMG_Texture_8Bit"
name2 = str(line_t[key1+1])+"_IMG_Texture_8Bit"
print('%s - %d features, %s - %d features' % (name1, len(kp1), name2, len(kp2)))
raw_matches = matcher.knnMatch(desc1, trainDeors = desc2, k = 2)
p1, p2, kp_pairs = filter_matches(kp1, kp2, raw_matches)
if len(p1) >= 100:
H, status = cv.findHomography(p1, p2, cv.RANSAC, 20.0)
print('%d / %d inliers/matched' % (np.sum(status), len(status)))
# do not draw outliers (there will be a lot of them)
kp_pairs = [kpp for kpp, flag in zip(kp_pairs, status) if flag]
else:
continue
print('%d matches found, not enough for homography estimation' % len(p1))
explore_match(img1, img2, dep1, dep2, name1, name2, kp_pairs, None, H)
print('Done')
if __name__ == '__main__':
print(__doc__)
main()C++格式实现：
ASiftDetector.cpp?ASiftDetector.h main.cpp?CMakeLists.txt
ASiftDetector.cpp?
//
// Created by spple on 19-12-6.
//
#include "ASiftDetector.h"
#include <iostream>
#include <opencv2/xfeatures2d.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
ASiftDetector::ASiftDetector()
{
detector = cv::xfeatures2d::SiftFeatureDetector::create();
num = 0;
}
void ASiftDetector::detectAndCompute(const Mat& img, std::vector< KeyPoint >& keypoints, Mat& deors)
{
// params = [(1.0, 0.0)]
// for t in 2**(0.5*np.arange(1,6)):
// for phi in np.arange(0, 180, 72.0 / t):
// params.append((t, phi))
// //affine参数
// vector<vector<double>> params;
// vector<double> temp;
// temp.push_back(1.0);
// temp.push_back(0.0);
// params.push_back(temp);
//
// for(int tl = 1; tl < 6; tl++) {
// double t = pow(2, 0.5 * tl);
// for (double phi = 0; phi < 180; phi += 72.0/t) {
// temp.clear();
// temp.push_back(t);
// temp.push_back(phi);
// params.push_back(temp);
// }
// }
keypoints.clear();
deors = Mat(0, 128, CV_32F);
int flag = 0;
for(int tl = 0; tl < 6; tl++)
{
double t = pow(2, 0.5*tl);
for(int phi = 0; phi < 180; phi += 72.0/t)
{
std::vector<KeyPoint> kps;
Mat desc;
Mat timg, mask, Ai;
img.copyTo(timg);
affineSkew(t, phi, timg, mask, Ai);
// debug:
// flag += 1;
// Mat img_disp;
// cv::bitwise_and(timg, timg, img_disp, mask);
// std::stringstream ssTemp;
// ssTemp<<flag;
// std::string strDst=ssTemp.str();
// imwrite("/home/spple/CLionProjects/ASIFT/11.14/P10_"+strDst+".jpg", img_disp);
detector->detectAndCompute(timg, mask, kps, desc);
for(unsigned int i = 0; i < kps.size(); i++)
{
Point3f kpt(kps[i].pt.x, kps[i].pt.y, 1);
Mat kpt_t = Ai*Mat(kpt);
kps[i].pt.x = kpt_t.at<float>(0,0);
kps[i].pt.y = kpt_t.at<float>(1,0);
//越界判断
if ((kps[i].pt.x < 0) || (kps[i].pt.y < 0 || (kps[i].pt.x > img.cols-1) || (kps[i].pt.y > img.rows-1)))
{
num++;
//std::cout << kps[i].pt.x <<":::" << kps[i].pt.y << std::endl;
if (kps[i].pt.x < 0)
kps[i].pt.x = 0;
if (kps[i].pt.y < 0)
kps[i].pt.y = 0;
if (kps[i].pt.x > img.cols-1)
kps[i].pt.x = img.cols-1;
if (kps[i].pt.y > img.rows-1)
kps[i].pt.y = img.rows-1;
}
}
keypoints.insert(keypoints.end(), kps.begin(), kps.end());
deors.push_back(desc);
}
}
std::cout <<"num:::" << num << std::endl;
}
void ASiftDetector::affineSkew(double tilt, double phi, Mat& img, Mat& mask, Mat& Ai)
{
int h = img.rows;
int w = img.cols;
mask = Mat(h, w, CV_8UC1, Scalar(255));
Mat A = Mat::eye(2,3, CV_32F);
if(phi != 0.0)
{
phi *= M_PI/180.;
double s = sin(phi);
double c = cos(phi);
A = (Mat_<float>(2,2) << c, -s, s, c);
Mat corners = (Mat_<float>(4,2) << 0, 0, w, 0, w, h, 0, h);
Mat tcorners = corners*A.t();
Mat tcorners_x, tcorners_y;
tcorners.col(0).copyTo(tcorners_x);
tcorners.col(1).copyTo(tcorners_y);
std::vector<Mat> channels;
channels.push_back(tcorners_x);
channels.push_back(tcorners_y);
merge(channels, tcorners);
Rect rect = boundingRect(tcorners);
A = (Mat_<float>(2,3) << c, -s, -rect.x, s, c, -rect.y);
warpAffine(img, img, A, Size(rect.width, rect.height), INTER_LINEAR, BORDER_REPLICATE);
}
if(tilt != 1.0)
{
double s = 0.8*sqrt(tilt*tilt-1);
GaussianBlur(img, img, Size(0,0), s, 0.01);
resize(img, img, Size(0,0), 1.0/tilt, 1.0, INTER_NEAREST);
A.row(0) = A.row(0)/tilt;
}
if(tilt != 1.0 || phi != 0.0)
{
h = img.rows;
w = img.cols;
warpAffine(mask, mask, A, Size(w, h), INTER_NEAREST);
}
invertAffineTransform(A, Ai);
}ASiftDetector.h
//
// Created by spple on 19-12-6.
//
#ifndef ASIFT_ASIFTDETECTOR_H
#define ASIFT_ASIFTDETECTOR_H
#include <vector>
#include <opencv2/core/core.hpp>
#include <opencv2/xfeatures2d.hpp>
using namespace cv;
class ASiftDetector
{
public:
ASiftDetector();
void detectAndCompute(const Mat& img, std::vector< KeyPoint >& keypoints, Mat& deors);
private:
void affineSkew(double tilt, double phi, Mat& img, Mat& mask, Mat& Ai);
cv::Ptr<cv::xfeatures2d::SiftFeatureDetector> detector;
int num;
};
#endif //ASIFT_ASIFTDETECTOR_Hmain.cpp
#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <cassert>
#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/xfeatures2d.hpp>
#include <opencv2/flann/flann.hpp>
#include <opencv2/calib3d/calib3d.hpp>
#include "ASiftDetector.h"
using namespace std;
using namespace cv;
#include <time.h>
// drawMatches(OriginalGrayImage, asiftKeypoints_query, targetGrayImage, asiftKeypoints_object, goodgoodMatches, img_RR_matches,
// Scalar(0, 255, 0), Scalar(0, 255, 0), vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS);
cv::Mat UpDownDrawInlier(const cv::Mat &queryImage, const cv::Mat &objectImage,
const vector<cv::Point2f> &queryCoord, const vector<cv::Point2f> &objectCoord) {
Size sz = Size(queryImage.size().width,
queryImage.size().height + objectImage.size().height);
Mat matchingImage = Mat::zeros(sz, CV_8UC3);
// 设置matchingImage的感兴趣区域大小并赋予原图
Mat roi1 = Mat(matchingImage, Rect(0, 0, queryImage.size().width, queryImage.size().height));
queryImage.copyTo(roi1);
Mat roi2 = Mat(matchingImage,
Rect(0, queryImage.size().height, objectImage.size().width, objectImage.size().height));
objectImage.copyTo(roi2);
//画出点
for (int i = 0; i < (int) queryCoord.size(); ++i) {
Point2f pt1 = queryCoord[i];
Point2f pt2 = objectCoord[i];
Point2f from = pt1;
Point2f to = Point(pt2.x, queryImage.size().height + pt2.y);
line(matchingImage, from, to, Scalar(0, 255, 255));
}
return matchingImage;
}
cv::Mat LeftUpRightDownDrawInlier(const cv::Mat &queryImage, const cv::Mat &objectImage,
const vector<cv::Point2f> &queryCoord, const vector<cv::Point2f> &objectCoord)
{
Size sz = Size(queryImage.size().width + objectImage.size().width,
queryImage.size().height + objectImage.size().height);
Mat matchingImage = Mat::zeros(sz, CV_8UC3);
// 设置matchingImage的感兴趣区域大小并赋予原图
Mat roi1 = Mat(matchingImage, Rect(0, 0, queryImage.size().width, queryImage.size().height));
queryImage.copyTo(roi1);
Mat roi2 = Mat(matchingImage, Rect(queryImage.size().width, queryImage.size().height, objectImage.size().width, objectImage.size().height));
objectImage.copyTo(roi2);
//画出点
for (int i = 0; i < (int)queryCoord.size(); ++i) {
Point2f pt1 = queryCoord[i];
Point2f pt2 = objectCoord[i];
Point2f from = pt1;
Point2f to = Point(pt2.x + queryImage.size().width, pt2.y + queryImage.size().height);
line(matchingImage, from, to, Scalar(0, 255, 255));
}
return matchingImage;
}
/*
* Calculates the least-squares best-fit transform that maps corresponding points A to B in m spatial dimensions
* Input:
* A: Nxm numpy array of corresponding points
* B: Nxm numpy array of corresponding points
* Returns:
* T: (m+1)x(m+1) homogeneous transformation matrix that maps A on to B
* R: mxm rotation matrix
* t: mx1 translation vector
* //https://blog.csdn.net/kewei9/article/details/74157236
*/
void best_fit_transform(std::vector<cv::Point3f> A, std::vector<cv::Point3f> B, cv::Mat & T, cv::Mat & R, cv::Mat & t)
{
if (A.size()!=B.size())
{
std::cout <<"error:::" << "A.size()!=B.size()" << std::endl;
}
int pointsNum = A.size();
//# translate points to their centroids
double srcSumX = 0.0f;
double srcSumY = 0.0f;
double srcSumZ = 0.0f;
double dstSumX = 0.0f;
double dstSumY = 0.0f;
double dstSumZ = 0.0f;
for (int i = 0; i < pointsNum; ++ i)
{
srcSumX += A[i].x;
srcSumY += A[i].y;
srcSumZ += A[i].z;
dstSumX += B[i].x;
dstSumY += B[i].y;
dstSumZ += B[i].z;
}
cv::Point3f centerSrc, centerDst;
centerSrc.x = float(srcSumX / pointsNum);
centerSrc.y = float(srcSumY / pointsNum);
centerSrc.z = float(srcSumZ / pointsNum);
centerDst.x = float(dstSumX / pointsNum);
centerDst.y = float(dstSumY / pointsNum);
centerDst.z = float(dstSumZ / pointsNum);
int m = 3;
cv::Mat srcMat(m, pointsNum, CV_32FC1);
cv::Mat dstMat(m, pointsNum, CV_32FC1);
float* srcDat = (float*)(srcMat.data);
float* dstDat = (float*)(dstMat.data);
for (int i = 0; i < pointsNum; ++ i)
{
srcDat[i] = A[i].x - centerSrc.x;
srcDat[pointsNum + i] = A[i].y - centerSrc.y;
srcDat[pointsNum * 2 + i] = A[i].z - centerSrc.z;
dstDat[i] = B[i].x - centerDst.x;
dstDat[pointsNum + i] = B[i].y - centerDst.y;
dstDat[pointsNum * 2 + i] = B[i].z - centerDst.z;
}
//# rotation matrix
cv::Mat matS = srcMat * dstMat.t();
cv::Mat matU, matW, matV;
cv::SVDecomp(matS, matW, matU, matV);
R = matV.t() * matU.t();
//# special reflection case
double det = cv::determinant(R);
if (det < 0)
{
//https://blog.csdn.net/xiaowei_cqu/article/details/19839019
float* data= matV.ptr<float>(m-1);
for (int i=0; i<matV.cols; i++) {
*data++= (*data * (-1));
}
R = matV.t() * matU.t();
}
//t = centroid_B.T - np.dot(R, centroid_A.T)
//# translation
//Mat(centerDst)=3*1
t = Mat(centerDst) - (R * Mat(centerSrc));
//T = np.identity(m + 1)
//T[:m, :m] = R
//T[:m, m] = t
//# homogeneous transformation
double datM[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
cv::Mat matM(4, 4, CV_32FC1, datM);
T = matM.clone();
}
int main() {
cv::Mat OriginalGrayImage = cv::imread("/home/spple/CLionProjects/ASIFT/11.14/22_IMG_Texture_8Bit.png", -1);
cv::Mat targetGrayImage = cv::imread("/home/spple/CLionProjects/ASIFT/11.14/33_IMG_Texture_8Bit.png", -1);
clock_t begin = clock();
ASiftDetector asiftDetector;
vector<KeyPoint> asiftKeypoints_query;
Mat asiftDeors_query;
asiftDetector.detectAndCompute(OriginalGrayImage, asiftKeypoints_query, asiftDeors_query);
vector<KeyPoint> asiftKeypoints_object;
Mat asiftDeors_object;
asiftDetector.detectAndCompute(targetGrayImage, asiftKeypoints_object, asiftDeors_object);
//overlap
clock_t end = clock();
cout<<"Running time: "<<(double)(end-begin)/CLOCKS_PER_SEC*1000<<"ms"<<endl;
std::cout <<"Keypoints_query_num:::" << asiftKeypoints_query.size() << std::endl;
std::cout <<"Keypoints_object_num:::" << asiftKeypoints_object.size() << std::endl;
//匹配
// - `BruteForce` (it uses L2 )
// - `BruteForce-L1`
// - `BruteForce-Hamming`
// - `BruteForce-Hamming(2)`
// - `FlannBased`
cv::Ptr<cv::DeorMatcher> matcher = cv::DeorMatcher::create("FlannBased");
vector<vector<DMatch> > matches;
matcher->knnMatch(asiftDeors_query,asiftDeors_object, matches, 2);
std::vector<cv::Point2f> queryPoints;
std::vector<cv::Point2f> trainPoints;
vector<DMatch> goodMatches;
//https://blog.csdn.net/linxihe123/article/details/70173476
vector<pair<KeyPoint,KeyPoint> >kp_pairs_temp;
for (size_t i = 0; i < matches.size(); i++)
{
if ((matches[i][0].distance < 0.75 * matches[i][1].distance) && (matches[i].size()==2))
{
KeyPoint temp1 = asiftKeypoints_query[matches[i][0].queryIdx];
KeyPoint temp2 = asiftKeypoints_object[matches[i][0].trainIdx];
goodMatches.push_back(matches[i][0]);
queryPoints.push_back(temp1.pt);
trainPoints.push_back(temp2.pt);
kp_pairs_temp.push_back(make_pair(temp1,temp2));
}
}
Mat img_RR_matches;
img_RR_matches = LeftUpRightDownDrawInlier(OriginalGrayImage, targetGrayImage, queryPoints, trainPoints);
imwrite("../11.14/c.jpg",img_RR_matches);
// 4点条件判断
const int minNumberMatchesAllowed = 4;
if (queryPoints.size() < minNumberMatchesAllowed)
return false;
double reprojectionThreshold=20.0;
std::vector<unsigned char> inliersMask(goodMatches.size());
Mat homography = findHomography(queryPoints,
trainPoints,
FM_RANSAC,
reprojectionThreshold,
inliersMask,
2000,
0.995);
// Mat homography = findHomography(queryPoints,
// trainPoints,
// inliersMask,
// FM_RANSAC);
// std::vector<unsigned char> RansacStatus(goodMatches.size());
// Mat Fundamental = findFundamentalMat(queryPoints,
// trainPoints,
// FM_RANSAC,
// 20,
// 0.99,
// RansacStatus);
// Mat Fundamental = findFundamentalMat(queryPoints,
// trainPoints,
// RansacStatus,
// FM_RANSAC);
vector<pair<KeyPoint,KeyPoint> >kp_pairs;
std::vector<cv::Point2f> newp1;
std::vector<cv::Point2f> newp2;
vector<DMatch> goodgoodMatches;
for (size_t i=0; i<inliersMask.size(); i++)
{
if (inliersMask[i])
{
goodgoodMatches.push_back(goodMatches[i]);
kp_pairs.push_back(kp_pairs_temp[i]);
newp1.push_back(kp_pairs_temp[i].first.pt);
newp2.push_back(kp_pairs_temp[i].second.pt);
}
}
img_RR_matches = LeftUpRightDownDrawInlier(OriginalGrayImage, targetGrayImage, newp1, newp2);
imwrite("../11.14/a.jpg",img_RR_matches);
//https://docs.opencv.org/3.0-beta/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html#findessentialmat
//https://docs.opencv.org/3.4.8/d9/d0c/group__calib3d.html#ga13f7e34de8fa516a686a56af1196247f
std::vector<unsigned char> EssentialMask(newp1.size());
cv::Mat intrinsics = (cv::Mat_<float>(3, 3) << 2269.16, 0, 1065.54, 0, 2268.4, 799.032, 0, 0, 1);
Mat Essential = findEssentialMat(newp1, newp2, intrinsics, cv::RANSAC, 0.999, 20, EssentialMask);
cv::Mat OriginalDepthImage = cv::imread("/home/spple/CLionProjects/ASIFT/11.14/22_IMG_DepthMap.tif", -1);
cv::Mat targetDepthImage = cv::imread("/home/spple/CLionProjects/ASIFT/11.14/33_IMG_DepthMap.tif", -1);
std::vector<cv::Point3f> trp1;
std::vector<cv::Point3f> trp2;
std::vector<cv::Point2f> trp1_temp;
std::vector<cv::Point2f> trp2_temp;
for (size_t key=0; key<newp1.size(); key++)
{
float x1 = newp1[key].x;
float y1 = newp1[key].y;
float x2 = newp2[key].x;
float y2 = newp2[key].y;
float d1 = OriginalDepthImage.at<float>(int(y1),int(x1));
cv::Point3f p1;
p1.z = float(d1) / intrinsics.ptr<float>(2)[2];
p1.x = (x1 - intrinsics.ptr<float>(0)[2]) * p1.z / intrinsics.ptr<float>(0)[0];
p1.y = (y1 - intrinsics.ptr<float>(1)[2]) * p1.z / intrinsics.ptr<float>(1)[1];
float d2 = targetDepthImage.at<float>(int(y2),int(x2));
cv::Point3f p2;
p2.z = float(d2) / intrinsics.ptr<float>(2)[2];
p2.x = (x2 - intrinsics.ptr<float>(0)[2]) * p2.z / intrinsics.ptr<float>(0)[0];
p2.y = (y2 - intrinsics.ptr<float>(1)[2]) * p2.z / intrinsics.ptr<float>(1)[1];
if(EssentialMask[key])
{
trp1.push_back(p1);
trp2.push_back(p2);
trp1_temp.push_back(newp1[key]);
trp2_temp.push_back(newp2[key]);
}
}
img_RR_matches = LeftUpRightDownDrawInlier(OriginalGrayImage, targetGrayImage, trp1_temp, trp2_temp);
imwrite("../11.14/b.jpg",img_RR_matches);
cout << "ICP start" << endl;
Mat T, R, t;
best_fit_transform(trp1, trp2, T, R, t);
/*
* python下的结果
* 11-22
[[ 0.9893 0.04623 0.1395 ]
[-0.04523 0.999 -0.0105 ]
[-0.1399 0.004074 0.99 ]]
[-42.38 92.5 -93.5 ]
* 11-33
[[ 0.979 -0.03976 -0.2006 ]
[ 0.01021 0.9893 -0.1462 ]
[ 0.2042 0.1411 0.9688 ]]
[ -2.81 162. -51.78]
*/
cout << R << endl;
cout << t << endl;
cout << "end code" << endl;
return 0;
}CMakeLists.txt
cmake_minimum_required(VERSION 3.12)
project(ASIFT)
set(CMAKE_CXX_STANDARD 14)
set(OpenCV_DIR "/media/spple/新加卷/Dataset/opencv-3.4.8/install/share/OpenCV/")
find_package(OpenCV REQUIRED)
INCLUDE_DIRECTORIES(
${OpenCV_INCLUDE_DIRS}
)
add_executable(ASIFT main.cpp ASiftDetector.h ASiftDetector.cpp)
target_link_libraries(ASIFT ${OpenCV_LIBS})
文章来源:https://blog.csdn.net/i_like_cpp/article/details/134950926
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