error: OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y &
問題原因：
You are probably working outside of the image dimensions. Does any of the values you pass to the cvSetImageROI function lay outside the image boudaries?
影象的ROI區域超過了影象的尺寸，即roi.x + roi.width > m.cols && roi.y + roi.height > m.rows
解決辦法：
判斷擷取的ROI尺寸是否在影象內
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