detectron2中save_text_instance_predictions?
save_text_instance_predictions
demo.py中修改
import json
## 生成json格式的数据
class Result:
def __init__(self, id, image, value):
self.id = id
self.image = image
self.value = value
def result_encoder(obj):
if isinstance(obj, Result):
return {'id': obj.id, 'image': obj.image, 'value': obj.value}
return json.JSONEncoder.default(obj)
visualized_output.save(out_filename)
#predictions.save(out_filename)
#print(predictions)
res = Result(os.path.basename(path), out_filename, text_output)
with open(os.path.join(args.output, "data.json"), "a", encoding="utf8") as file:
json.dump(result_encoder(res), file, ensure_ascii=False, indent=4)
关于路径
assert os.path.isdir(args.output), args.output
out_filename = os.path.join(args.output, os.path.basename(path))
Python编程语言判断是否是目录
在Python编程语言中可以使用os.path.isdir()函数判断某一路径是否为目录。其函数原型如下所示。
os.path.isdir(path)
其参数含义如下。path 要进行判断的路径。以下实例判断E:\book\temp是否为目录。
>>> import os
>>> os.path.isdir('E:\\book\\temp')
判断E:\book\temp是否为目录
True 表示 E:\book\temp是目录,注意力 python里面是True不是true
os.path.join()函数用于路径拼接文件路径,可以传入多个路径
>>> import os
>>> print(os.path.join('path','abc','yyy'))
path\abc\yyy
os.path.basename(path)就是给定一串路径的最终找到的那个文件
来个例子
import os
# --------------------------------------------------------#
filePath = r"D:\Python\Python35\Lib\site-packages\jieba\analyse\idf.txt"
print('路径为:',filePath)
print(os.path.basename(filePath))
print(os.path.dirname(filePath))
# --------------------------------------------------------#
filePath = r'D:\Python\Python35\Lib\site-packages\jieba'
print('路径为:',filePath)
print(os.path.basename(filePath))
print(os.path.dirname(filePath))
输出
路径为: D:\Python\Python35\Lib\site-packages\jieba\analyse\idf.txt
idf.txt
D:\Python\Python35\Lib\site-packages\jieba\analyse
路径为: D:\Python\Python35\Lib\site-packages\jieba
jieba
D:\Python\Python35\Lib\site-packages
————————————————
原文链接:https://blog.csdn.net/m0_46653437/article/details/115876616
python官方文档链接
将 Python 对象序列化为 JSON 字符串
with open 打开文件,并以写入模式 **创建或覆盖 ** 文件
这段很基础对我很重要,一开始在想,是否需要手动创建之后才能with open……,如果不存在,会自动创建
import json
# 创建一个字典对象
data = {
"name": "John",
"age": 30,
"city": "New York"
}
# 打开文件,并以写入模式创建或覆盖文件
with open("data.json", "w") as file:
# 将字典对象转换为JSON格式并写入文件
json.dump(data, file)
上述代码将创建一个名为data.json的JSON文件,并将data字典对象写入文件中。如果你想要格式化输出的JSON文件,使其更易读,你可以使用indent参数指定缩进级别,如下所示:
import json
data = {
"name": "John",
"age": 30,
"city": "New York"
}
with open("data.json", "w") as file:
json.dump(data, file, indent=4)
作者:百科全书77
链接:https://www.zhihu.com/question/631483792/answer/3299538515
来源:知乎
使用 json.JSONEncoder() 方法
我们还可以使用 json.JSONEncoder() 方法来创建自定义的编码器,将 Python 对象序列化为 JSON 字符串,然后将其写入文件。以下是一个示例:
import json
class Person:
def __init__(self, name, age, city):
self.name = name
self.age = age
self.city = city
def person_encoder(obj):
if isinstance(obj, Person):
return {'name': obj.name, 'age': obj.age, 'city': obj.city}
return json.JSONEncoder.default(obj)
person = Person('John', 30, 'New York')
with open('data.json', 'w') as f:
json_str = json.dumps(person, default=person_encoder)
f.write(json_str)
在这个示例中,我们首先定义了一个自定义的类 Person,然后定义了一个自定义的编码器 person_encoder,将 Person 对象序列化为 JSON 格式。最后,我们使用 json.dumps() 方法将 Person 对象序列化为 JSON 字符串,并将其写入文件 data.json 中。
原文链接:Python 如何创建 json 文件?
dump、dumps序列化为json格式和序列化为json字符串,区别?(用到再说)
import json
data = {'name': 'John', 'age': 30, 'city': 'New York'}
with open('data.json', 'w') as f:
json.dump(data, f)
在这个示例中,我们使用了 json.dump() 方法将 Python 字典对象 data 序列化为 JSON 格式,并将其写入到文件 data.json 中。
除了使用 json.dump() 方法直接将 Python 对象写入到文件中,我们还可以使用 json.dumps() 方法将 Python 对象序列化为 JSON 字符串,然后将其写入文件。以下是一个示例:
import json
data = {'name': 'John', 'age': 30, 'city': 'New York'}
with open('data.json', 'w') as f:
json_str = json.dumps(data)
f.write(json_str)
在这个示例中,我们首先使用 json.dumps() 方法将 Python 字典对象 data 序列化为 JSON 字符串,然后使用文件对象的 write() 方法将其写入文件 data.json 中。
python中dict和json的转换以及读取json文件
python 把字典转json
将dict类型变量转换为json存在dump和dumps两个方法
dump将dict转换为str类型
注意
如果想将dict输出到文件中,直接用dumps即可,如果先dump再dumps就会输出一整个字符串,因为有引号的存在并不是正常的json格式
保存列表为.txt文件
#1/list写入txt
ipTable = ['158.59.194.213', '18.9.14.13', '58.59.14.21']
fileObject = open('sampleList.txt', 'w')
for ip in ipTable:
fileObject.write(ip)
fileObject.write('\n')
fileObject.close()
python对CSV、Excel、txt、dat、mat文件的处理
python将数据保存为json文件时,打开json文件里面的中文发现是unicode码
开保存之后的json文件发现除了字母,原来的字典数据里面的中文全部变成了unicode码,像下面这个样子
Python 使用 json.dump()
保存文件时中文会变成 Unicode。在打开写出文件时加入 encoding="utf8"
,在dump时加入 ensure_ascii=False
即可解决。
city_list = [{"name": "黑龙江呼玛", "lon": 126.6, "lat": 51.72},
/{"name": "黑龙江塔河", "lon": 124.7, "lat": 52.32},
/{"name": "黑龙江漠河", "lon": 122.37, "lat": 53.48}]
f = open("city.json", "w", encoding="utf8")
json.dump(city_list, f, ensure_ascii=False)
总结一下:
1、python3里面默认编码是unicode
2、做dump与dumps操作时,会默认将中文转换为unicode,但在做逆向操作load和loads时会转换为中文,但是中间态(例如存储的json文件)的中文编码方式仍然是unicode
解决办法:
在dump里面添加ensure_ascii=False
原文链接
with open(os.path.join(args.output, “data.json”), “a”) as file: 读写文件参数
predictor.py
def run_on_image(self, image):
……
else:
if "sem_seg" in predictions:
vis_output = visualizer.draw_sem_seg(
predictions["sem_seg"].argmax(dim=0).to(self.cpu_device))
if "instances" in predictions:
instances = predictions["instances"].to(self.cpu_device)
vis_output = visualizer.draw_instance_predictions(predictions=instances)
text_output = visualizer.save_text_instance_predictions(predictions=instances)
return predictions, vis_output,text_output
追溯到 visualizer.py写的save_text_instance_predictions 函数
visualizer.py中save_text_instance_predictions(deepsolo/adet/visualizer.py,import了 detectron2的visualizer.py?
class TextVisualizer(Visualizer):
……
def _ctc_decode_recognition(self, rec):
last_char = '###'
s = ''
for c in rec:
c = int(c)
if c < self.voc_size - 1:
if last_char != c:
if self.voc_size == 37 or self.voc_size == 96:
s += self.CTLABELS[c]
last_char = c
else:
s += str(chr(self.CTLABELS[c]))
last_char = c
else:
last_char = '###'
return s
def draw_instance_predictions(self, predictions):
ctrl_pnts = predictions.ctrl_points.numpy()
scores = predictions.scores.tolist()
recs = predictions.recs
bd_pts = np.asarray(predictions.bd)
self.overlay_instances(ctrl_pnts, scores, recs, bd_pts)
return self.output
def overlay_instances(self, ctrl_pnts, scores, recs, bd_pnts, alpha=0.4):
colors = [(0,0.5,0),(0,0.75,0),(1,0,1),(0.75,0,0.75),(0.5,0,0.5),(1,0,0),(0.75,0,0),(0.5,0,0),
(0,0,1),(0,0,0.75),(0.75,0.25,0.25),(0.75,0.5,0.5),(0,0.75,0.75),(0,0.5,0.5),(0,0.3,0.75)]
fg=True
for ctrl_pnt, score, rec, bd in zip(ctrl_pnts, scores, recs, bd_pnts):
color = random.choice(colors)
# draw polygons
if bd is not None:
bd = np.hsplit(bd, 2)
bd = np.vstack([bd[0], bd[1][::-1]])
self.draw_polygon(bd, color, alpha=alpha)
# draw center lines
line = self._process_ctrl_pnt(ctrl_pnt)
line_ = LineString(line)
center_point = np.array(line_.interpolate(0.5, normalized=True).coords[0], dtype=np.int32)
# self.draw_line(
# line[:, 0],
# line[:, 1],
# color=color,
# linewidth=2
# )
# for pt in line:
# self.draw_circle(pt, 'w', radius=4)
# self.draw_circle(pt, 'r', radius=2)
# draw text
text = self._ctc_decode_recognition(rec)
if self.voc_size == 37:
text = text.upper()
# text = "{:.2f}: {}".format(score, text)
text = "{}".format(text)
lighter_color = self._change_color_brightness(color, brightness_factor=0)
if bd is not None:
text_pos = bd[0] - np.array([0,15])
else:
text_pos = center_point
horiz_align = "left"
font_size = self._default_font_size
self.draw_text(
text,
text_pos,
color=lighter_color,
horizontal_alignment=horiz_align,
font_size=font_size,
draw_chinese=False if self.voc_size == 37 or self.voc_size == 96 else True
)
def draw_text(
self,
text,
position,
*,
font_size=None,
color="g",
horizontal_alignment="center",
rotation=0,
draw_chinese=False
):
"""
Args:
text (str): class label
position (tuple): a tuple of the x and y coordinates to place text on image.
font_size (int, optional): font of the text. If not provided, a font size
proportional to the image width is calculated and used.
color: color of the text. Refer to `matplotlib.colors` for full list
of formats that are accepted.
horizontal_alignment (str): see `matplotlib.text.Text`
rotation: rotation angle in degrees CCW
Returns:
output (VisImage): image object with text drawn.
"""
if not font_size:
font_size = self._default_font_size
# since the text background is dark, we don't want the text to be dark
color = np.maximum(list(mplc.to_rgb(color)), 0.2)
color[np.argmax(color)] = max(0.8, np.max(color))
x, y = position
if draw_chinese:
font_path = "./simsun.ttc"
prop = mfm.FontProperties(fname=font_path)
self.output.ax.text(
x,
y,
text,
size=font_size * self.output.scale,
family="sans-serif",
bbox={"facecolor": "white", "alpha": 0.8, "pad": 0.7, "edgecolor": "none"},
verticalalignment="top",
horizontalalignment=horizontal_alignment,
color=color,
zorder=10,
rotation=rotation,
fontproperties=prop
)
else:
self.output.ax.text(
x,
y,
text,
size=font_size * self.output.scale,
family="sans-serif",
bbox={"facecolor": "white", "alpha": 0.8, "pad": 0.7, "edgecolor": "none"},
verticalalignment="top",
horizontalalignment=horizontal_alignment,
color=color,
zorder=10,
rotation=rotation,
)
return self.output
结合这几段,按图索骥,
overlay_instances函数里的
for ctrl_pnt, score, rec, bd in zip(ctrl_pnts, scores, recs, bd_pnts):
……
text = self._ctc_decode_recognition(rec)
总之就是模仿draw_instance_predictions
添加了一个函数save_text_instance_predictions
def save_text_instance_predictions(self, predictions):
recs = predictions.recs
text_output = ""
for rec in recs:
text_output = text_output + ' ' + self._ctc_decode_recognition(rec)
return text_output
就是不知道return self.output
有什么特别含义,
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