opencv Error: Assertion failed (size.width>0 && size.height>0) in cv::imshow,

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opencv 报错

Error: Assertion failed (size.width>0 && size.height>0) in cv::imshow,

原因：
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更多：
https://blog.csdn.net/sinat_39150454/article/details/74315806

https://stackoverflow.com/questions/31341845/opencv-error-assertion-failed-size-width0-size-height0-simple-code