OpenCV Python保存jpg指定质量；给出SystemError [英] OpenCV Python save jpg specifying quality; gives SystemError

问题描述

我刚刚在Windows 7(32位)/Python 2.7.3上安装了最新的OpenCV 2.4，但是我仍然遇到与使用Beta版本时相同的错误:

I just installed the newest OpenCV 2.4 on windows 7 (32bit)/ Python 2.7.3,
but I still get the same error I got using the beta version:

>>> import cv2
>>> a = cv2.imread(r"DMap.jpg")
>>> a.shape
(1080, 1920, 3)
>>> cv2.imwrite('img_CV2_90.jpg', a, [cv2.IMWRITE_JPEG_QUALITY, 90])
Traceback (most recent call last):
  File "<input>", line 1, in <module>
SystemError: error return without exception set

有什么想法吗?使用元组代替列表，或在序列中添加尾随0都无济于事-同样的错误.

Any ideas ? Using tuple instead of list, or adding a trailing 0 to the sequence does not help - same error.

谢谢 -塞巴斯蒂安·哈斯(Sebastian Haase)

Thanks - Sebastian Haase

推荐答案

这可能是由于imwrite()参数从Python到C，cv2.IMWRITE_JPEG_QUALITY(类型为"long")的错误包装所致，以及引起一些奇怪的问题.您应该尝试将此常量转换为"int"类型:

It is probably due to some wrong wrapping of the imwrite() parameters from Python to C, cv2.IMWRITE_JPEG_QUALITY (which is of type "long"), and causes some weird problems. You should try to convert this constant to "int" type:

cv2.imwrite('img_CV2_90.jpg', a, [int(cv2.IMWRITE_JPEG_QUALITY), 90])

对我来说，它解决了这个问题(python 2.7.2，opencv 2.4.1)

for me it solved the problem (python 2.7.2, opencv 2.4.1)

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