Closed w136111526 closed 3 years ago
ermig1979
commented
3 years ago Try to use
cv::Mat matResult(400, 500, CV_8UC3, rgbFrame.planes[0].data, rgbFrame.planes[0].stride);instead of
cv::Mat matResult(400, 500, CV_8UC3, rgbFrame.planes[0].data);
w136111526
commented
3 years ago It looks like the Roi region of the image is normal, but there is a small problem. If I choose a region that is too small (less than 100 widths) , the image transcoding will only be partially normal and the right one will not be displayed：
std::ifstream ifs("e:/1280x720.yuv", std::ios::binary);
ifs.seekg(0, std::ios::end);
int nlen = ifs.tellg();//yuv420p:1280x720x3/2
unsigned char data = new unsigned char[nlen];
ifs.seekg(0, ios::beg);
ifs.read((char)data, nlen);
ifs.close();
unsigned char ptr = data;
Frame frame(1280, 720, Frame::Yuv420p, ptr, 1280, ptr + graySize, 640, ptr + graySize 5 / 4, 640);
Frame subFrameRegion = frame.Region(200, 400, 250, 520);
Frame rgbFrame(50, 120, Frame::Bgr24);
DWORD dTime = GetTickCount();
Convert(subFrameRegion, rgbFrame);
cv::Mat matResult(120, 50, CV_8UC3, rgbFrame.planes[0].data, rgbFrame.planes[0].stride);
cv::imshow("test", matResult);
cv::waitKey(0);
delete[] data;
ermig1979
commented
3 years ago 1) Function 'Convert' converts only frames with the same size. 2) Could you confuse width and height here: Frame rgbFrame(50, 120, Frame::Bgr24); cv::Mat matResult(120, 50, CV_8UC3, rgbFrame.planes[0].data, rgbFrame.planes[0].stride);
Hello, I want to use SIMD Yuv420 sub-region image and converted to rgb image data, but the image display texture is not normal, what is the problem with my code: std::ifstream ifs("e:/1280x720.yuv", std::ios::binary); ifs.seekg(0, std::ios::end); int nlen = ifs.tellg();//yuv420p:1280x720x3/2 unsigned char data = new unsigned char[nlen]; ifs.seekg(0, ios::beg); ifs.read((char)data, nlen); ifs.close(); unsigned char ptr = data; Frame frame(1280, 720, Frame::Yuv420p, ptr, 1280, ptr + graySize, 640, ptr + graySize 5 / 4, 640); Frame subFrameRegion = frame.Region(300, 100, 800, 500); Frame rgbFrame(500, 400, Frame::Bgr24); DWORD dTime = GetTickCount(); Convert(subFrameRegion, rgbFrame); cv::Mat matResult(400, 500, CV_8UC3, rgbFrame.planes[0].data); cv::imshow("test", matResult); cv::waitKey(0); delete[] data;