OpenCV Error:Assertion failed (size.width>0 && size.height>0) in cv::imshow
2016-11-07 23:02
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原因：在用OpenCV2.4.10打开摄像头或视频的时候，Capture库会先自动检测摄像头有没有读到帧，如果没有，就会报错，然后在执行自己的程序。
解决办法：加if判断，跳过系统自己的判断，直接执行自己的程序。
在第一次调用imshow前面，加一条判断不为空的语句；
解决办法：加if判断，跳过系统自己的判断，直接执行自己的程序。
在第一次调用imshow前面，加一条判断不为空的语句；
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