1、QPixmap转为Image：
QPixmap pixmap;
pixmap.load("../Image/1.jpg");
QImage tempImage = pixmap.toImage();
2、QImage转为QPixmap：
QImage image;
image.load("../Image/1.jpg");
QPixmap tempPixmap = QPixmap::fromImage(image);
3、QImage转换成Mat
1 Mat QImage2cvMat(QImage image)
2 {
3 cv::Mat mat;
4 switch(image.format())
5 {
6 case QImage::Format_ARGB32:
7 case QImage::Format_RGB32:
8 case QImage::Format_ARGB32_Premultiplied:
9 mat = cv::Mat(image.height(), image.width(), CV_8UC4, (void*)image.bits(), image.bytesPerLine());
10 break;
11 case QImage::Format_RGB888:
12 mat = cv::Mat(image.height(), image.width(), CV_8UC3, (void*)image.bits(), image.bytesPerLine());
13 cv::cvtColor(mat, mat, CV_BGR2RGB);
14 break;
15 case QImage::Format_Indexed8:
16 mat = cv::Mat(image.height(), image.width(), CV_8UC1, (void*)image.bits(), image.bytesPerLine());
17 break;
18 }
19 return mat;
20 }
4、Mat转换成QImage
QImage cvMat2QImage(const cv::Mat& mat)
{
// 8-bits unsigned, NO. OF CHANNELS = 1
if(mat.type() == CV_8UC1)
{
QImage image(mat.cols, mat.rows, QImage::Format_Indexed8);
// Set the color table (used to translate colour indexes to qRgb values)
image.setNumColors(256); //5.9版本之后取消了setNumColors函数，可以使用image.setColoeCount(256);
for(int i = 0; i < 256; i++)
{
image.setColor(i, qRgb(i, i, i));
}
// Copy input Mat
uchar *pSrc = mat.data;
for(int row = 0; row < mat.rows; row ++)
{
uchar *pDest = image.scanLine(row);
memcpy(pDest, pSrc, mat.cols);
pSrc += mat.step;
}
return image;
}
// 8-bits unsigned, NO. OF CHANNELS = 3
else if(mat.type() == CV_8UC3)
{
// Copy input Mat
const uchar *pSrc = (const uchar*)mat.data;
// Create QImage with same dimensions as input Mat
QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);
return image.rgbSwapped();
}
else if(mat.type() == CV_8UC4)
{
// Copy input Mat
const uchar *pSrc = (const uchar*)mat.data;
// Create QImage with same dimensions as input Mat
QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_ARGB32);
return image.copy();
}
else
{
return QImage();
}
}
