整治PPOCRLabel中cv2文件读取问题（更新中）

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

shell 复制代码

pip install PPOCRLabel==2.1.3

启动

shell 复制代码

PPOCRLabel --lang ch

修改记录

修改1：

报错：AttributeError: 'NoneType' object has no attribute 'shape'

angular2html 复制代码

'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 run
    h, 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

python 复制代码

  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

python 复制代码

# 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 image
    image = np.asarray(image)
    image = image[:, :, ::-1]  # flip color channels from RGB to BGR
    w, h = image.shape[1], image.shape[0]  # update size after resize
    if 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'

python 复制代码

Traceback (most recent call last):
  File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1889, in saveFile
    self._saveFile(imgidx, mode=mode)
  File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1934, in _saveFile
    self.openNextImg()
  File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1880, in openNextImg
    self.loadFile(filename)
  File "D:\ProgramData\Anaconda3\envs\paddle\lib\site-packages\PPOCRLabel\PPOCRLabel.py", line 1550, in loadFile
    height, 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：

python 复制代码

# 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：
  复制代码
```
Can not recognise the detection box in xxxx,png. Please change manually'
```
  unicodeFilePath is J:\data\mllm-data\xxxxxxxxx\wKh2CWERPJOAY2x-AAE62o598k0620.png
  OpenCV(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...

python 复制代码

# 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)