i have searched a lot on the internet but i have only found how to convert Qimage to RGB format, i want to convert an Qimage to cv mat format CV_64FC3. i have really bad results when i work with CV_8UC3
here is my code :
QImage myImage;
myImage.load("C://images//PolarImage300915163358.bmp");
QLabel myLabel;
myLabel.setPixmap(QPixmap::fromImage(myImage));
//myLabel.show();
cv::Mat image1 = QImage2Mat(myImage);
Mat img;
image1.convertTo(img, CV_64FC3, 1.0 / 255.0);
and here is the function that i used :
cv::Mat QImage2Mat(QImage const& src)
{
cv::Mat tmp(src.height(),src.width(),CV_8UC3,(uchar*)src.bits(),src.bytesPerLine());
cv::Mat result; // deep copy just in case (my lack of knowledge with open cv)
cvtColor(tmp, result,CV_BGR2RGB);
return result;
}
please help me i m new to both opencv and Qt
Not sure what you mean with bad results, but you are assuming that QImage also loads the image as OpenCV (BGR
). In the documentation it tells you that they use ARGB
.
So, knowing this you have 2 options:
QImage::Format_RGB888
the Qimage
using the function convertToFormat
and then this line cvtColor(tmp, result,CV_BGR2RGB);
is not needed, since it will be already in RGB.CV_8UC4
when creating the cv::Mat
and then drop the first channel (channel alpha) using either split and join or mixchannels.