[英]How to fix Opencv arcLength function error: (-215:Assertion failed)
以下代码给了我以下错误：
contours = cv2.findContours(horizontal_lines_canvas, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)
contours = contours[1]
contours = sorted(contours, key=lambda c: cv2.arcLength(c, True), reverse=True)[:2]
错误：
cv2.error：OpenCV（4.0.0）/Users/travis/build/skvark/opencv-python/opencv/modules/imgproc/src/shapeescr.cpp:237：错误：（-215：断言失败）计数> = 0 && (depth == CV_32F || depth == CV_32S) 在 function 'arcLength'
为什么这样？ 一切似乎都是正确的
谢谢你，汉斯希尔斯。
替换为：
contours, hierarchy = cv2.findContours(..
如何修复opencv / modules / objdetect / src / cascadedetect.cpp：1698：错误：（-215：断言失败）！empty（）在函数'detectMultiScale'^中？
[英]How to fix opencv/modules/objdetect/src/cascadedetect.cpp:1698: error: (-215:Assertion failed) !empty() in function 'detectMultiScale'^?
如何在 pycharm 中修复此错误？ cv2.error: OpenCV(3.4.2) 错误: (-215:Assertion failed)
[英]How to fix this error in pycharm? cv2.error: OpenCV(3.4.2) error: (-215:Assertion failed)
OpenCV错误：（-215：断言失败）！_src.empty（）在函数'cvtColor'中
[英]OpenCV error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'
OpenCV 错误：(-215:Assertion failed) VScn::contains(scn) && VDcn::contains(dcn) && VDepth::contains(depth) in function 'CvtHelper'
[英]OpenCV Error: (-215:Assertion failed) VScn::contains(scn) && VDcn::contains(dcn) && VDepth::contains(depth) in function 'CvtHelper'
OpenCV 4.4.0 错误：（-215：断言失败）._img:empty() 在 function 'cv::imwrite'
[英]OpenCV 4.4.0 error: (-215:Assertion failed) !_img.empty() in function 'cv::imwrite'
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[英]OpenCV(4.2.0) error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'
在 function 'cvtColor' 中收到 Opencv: (-215:Assertion failed)._src.empty() 中的错误
[英]Receiving the error in Opencv: (-215:Assertion failed) !_src.empty() in function 'cvtColor'
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