整治PPOCRLabel中cv2文件读取问题（更新中）

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PPOCRLabel

• 使用PPOCRLabel对ocr预标注结果进行纠正
• 由于PaddleOCR代码库十分混乱,路径经常乱掉pip和代码库的代码,经常报错，ocr也是使用paddleocr的pip包;

安装

pip install PPOCRLabel==2.1.3

启动

PPOCRLabel --lang ch

修改记录

修改1：

• 报错：AttributeError: ‘NoneType’ object has no attribute ‘shape’

'NoneType' object has no attribute 'shape'
Traceback (most recent call last):File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\libs\autoDialog.py", line 41, in runh, w, _ = cv2.imdecode(np.fromfile(Imgpath, dtype=np.uint8), 1).shape
AttributeError: 'NoneType' object has no attribute 'shape'

• 原因：cv2不支持读取带有中文字符路径文件

  h, w, _ = cv2.imdecode(np.fromfile(Imgpath, dtype=np.uint8), 1).shape

• 解决：使用PIL替换cv2, 将上述代码替换为

# 修改文件："D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\libs\autoDialog.py", line 41
# 增加PIL读取图片函数
from PIL import Image
def load_image(image_path: str, return_chw: bool = True, size: tuple = None):image = Image.open(image_path).convert("RGB")if size is not None:image = image.resize(size)  # resize imageimage = np.asarray(image)image = image[:, :, ::-1]  # flip color channels from RGB to BGRw, h = image.shape[1], image.shape[0]  # update size after resizeif return_chw:image = image.transpose(2, 0, 1)return image, (w, h)# 替换上面代码
try:image_data, (w, h) = load_image(Imgpath, return_chw=False)
except Exception as e:print(f"load file {Imgpath} fail!")continue

修改2

• 报错：AttributeError: ‘NoneType’ object has no attribute ‘shape’

Traceback (most recent call last):File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1889, in saveFileself._saveFile(imgidx, mode=mode)File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1934, in _saveFileself.openNextImg()File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1880, in openNextImgself.loadFile(filename)File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1550, in loadFileheight, width, depth = cvimg.shape
AttributeError: 'NoneType' object has no attribute 'shape'

• 原因还是cv2不能读取中文路径文件
• 解决：

# 修改: File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1550, in loadFile
# cvimg = cv2.imdecode(np.fromfile(unicodeFilePath, dtype=np.uint8), 1)
cvimg, _ = load_image(unicodeFilePath, return_chw=False)

修改3

• 报错:error: (-215:Assertion failed) _src.total() > 0 in function ‘cv::warpPerspective’

  • 报错描述：在对PPOCRLABEL的框进行重新识别是，发生如下报错：

    Can not recognise the detection box in xxxx,png. Please change manually'unicodeFilePath is J:\data\mllm-data\xxxxxxxxx\wKh2CWERPJOAY2x-AAE62o598k0620.pngOpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\imgproc\src\imgwarp.cpp:3143: error: (-215:Assertion failed) _src.total() > 0 in function 'cv::warpPerspective'
  

  • 原因是我们的ocr预标注数据Label.txt是使用PIL读取图片数据，调用ppocr进行生产的（并不是在PPOCRLabel工具内部生产的）, 当我们修改数据框后, PPOCRLabel尝试再次使用cv2进行读取原图,此时由于cv2对路径较为敏感,经常会读取文件失败,才会出现如上情况

• 解决：
  依旧是修改PPOCRLabel源码, 把cv2读取改为PIL读取,就不惯着cv2的臭毛病…

# 修改如下代码def reRecognition(self):#img = cv2.imdecode(np.fromfile(self.filePath,dtype=np.uint8),1)img, _ = load_image(self.filePath, return_chw=False)

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