第一步,轉換格式前預先獲得待顯示控件的大小,若相等則不做處理,若不等則首先改變Mat圖像大小,再進行轉換。
CRect rect;
GetDlgItem(IDC_STATIC_SRC)->GetClientRect(&rect);
cv::Size winSize(rect.right, rect.bottom);
// Resize the source to the size of the destination image if necessary
cv::Mat cvImgTmp(winSize, CV_8UC3);
if (imgSrc.size() != winSize)
{
cv::resize(imgSrc, cvImgTmp, winSize);
}
else
{
cvImgTmp = imgSrc;
}
第二步,將Mat圖像轉換成CImage格式
int Mat2CImage(Mat *mat, CImage &img) {
if (!mat || mat->empty())
return -1;
int nBPP = mat->channels() * 8;
img.Create(mat->cols, mat->rows, nBPP);
if (nBPP == 8)
{
static RGBQUAD pRGB[256];
for (int i = 0; i < 256; i++)
pRGB[i].rgbBlue = pRGB[i].rgbGreen = pRGB[i].rgbRed = i;
img.SetColorTable(0, 256, pRGB);
}
uchar* psrc = mat->data;
uchar* pdst = (uchar*)img.GetBits();
int imgPitch = img.GetPitch();
for (int y = 0; y < mat->rows; y++)
{
memcpy(pdst, psrc, mat->cols*mat->channels());//mat->step is incorrect for those images created by roi (sub-images!)
psrc += mat->step;
pdst += imgPitch;
}
return 0;
}
第三步,可以直接顯示CImage格式圖像
CImage imgDst;
Mat2CImage(&cvImgTmp, imgDst);
imgDst.Draw(GetDlgItem(IDC_STATIC_SRC)->GetDC()->GetSafeHdc(), rect);