OpenCv断言失败
OpenCv断言失败
提问于 2014-01-21 11:32:49
我的工作是在2D图像中找脸的应用程序，后来在同一图像中我想找嘴巴，但我现在有一些问题。这是我到目前为止的代码：
for (int i = 0; i < faces.size(); i++)
{
Point pt1(faces[i].x, faces[i].y);
Point pt2((faces[i].x + faces[i].height), (faces[i].y + faces[i].width));
rectangle(frame, pt1, pt2, Scalar(255,0 , 0), 2, 8, 0);
//I WANT ROI(FOR MOUTH DETECTION) TO BE ONLY HALF OF THE RECTANGLE WITH FACE
Rect mouthROI;
mouthROI.x = (faces[i].x);
mouthROI.y = faces[i].y*(1.5);
mouthROI.width = (faces[i].x + faces[i].height);
mouthROI.height = (faces[i].y + faces[i].width);
//I CHECK IF NEW RECTANGLE IS EXACTLY BOTTOM HALF OF PREVIOUS ONE
Point ptAA(mouthROI.x, mouthROI.y);
Point ptBB(mouthROI.width, mouthROI.height);
rectangle(frame, ptBB, ptAA, Scalar(0,0 , 255), 2, 2, 0);
Mat image_roi = frame(mouthROI);
cvtColor(frame, frame_gray, COLOR_BGR2GRAY);
equalizeHist( frame_gray, frame_gray );
// DETECTING MOUTH INSIDE ROI OF EARLIER DETECTED FACE
mouth_cascade.detectMultiScale(image_roi, mouths, 1.1, 2, 0, Size(30, 30));
for(int i = 0; i < mouths.size(); i++)
{
Point pt1(mouths[i].x, mouths[i].y); // Display detected faces on main window - live stream from camera
Point pt2((mouths[i].x + mouths[i].height), (mouths[i].y + mouths[i].width));
rectangle(frame, pt1, pt2, Scalar(0, 255, 0), 2, 8, 0);
}
}不幸的是，这段代码不能工作。我得到的错误如下：
OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in cv::Mat::Mat(const cv::Mat&, const cv::Rect&), file C:/build/2_4_PackSlave-win32-vc11-shared/opencv/modules/core/src/matrix.cpp, line 323如何修复此错误。感谢大家的帮助！
回答 1
Stack Overflow用户
回答已采纳
发布于 2014-01-21 12:23:25
您初始化mouthROI的方式不正确。应该是这样的，
<previous code>
mouthROI.width = (faces[i].height);
mouthROI.height = (faces[i].width);
Point ptAA(mouthROI.x, mouthROI.y);
Point ptBB(mouthROI.x+mouthROI.width, mouthROI.y+mouthROI.height);请记住，cv::Rect不采用矩形的高度位置，它采用左上角的位置以及宽度和高度。有关更多详细信息，请参阅documentation。
HTH
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原文链接：
https://stackoverflow.com/questions/21248611
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