使用logitech C270(OpenCV 2.4.2 / C)在Ubuntu上运行简单的摄像头捕获时出现此错误消息：
HIGHGUI ERROR: V4L/V4L2: VIdioC_S_CROP
并进一步：
Corrupt JPEG data: 2 extraneous bytes before marker 0xd1
Corrupt JPEG data: 1 extraneous bytes before marker 0xd6
Corrupt JPEG data: 1 extraneous bytes before marker 0xd0
Corrupt JPEG data: 1 extraneous bytes before marker 0xd0
我得到帧但是在写入Mat对象时交换了帧宽和高度的值,见下图：
Mat frame; videoCapture = new VideoCapture(camId); if(!videoCapture->isOpened()) throw Exception(); cout << "Frame width: " << videoCapture->get(CV_CAP_PROP_FRAME_WIDTH) << endl; cout << "Frame height: " << videoCapture->get(CV_CAP_PROP_FRAME_HEIGHT) << endl; (*videoCapture) >> frame; cout << "Mat width: " << frame.rows << endl; cout << "Mat height: " << frame.cols << endl;
输出：
Frame width: 640 Frame height: 480 Mat width: 480 Mat height: 640
图像的宽度由列数给出.你的代码应该是
cout << "Mat width: " << frame.cols << endl; cout << "Mat height: " << frame.rows << endl;
所以宽度和高度之间没有交换.
