dstQuad[0]=new CvPoint(-1*roiPoint[0].X,-1*roiPoint[0].Y);
dstQuad[1]=new CvPoint(roiPoint[1].X+(dstImg.Width-roiPoint[1].X));
dstQuad[3]=new CvPoint(roiPoint[2].X+(dstImg.Width-roiPoint[2].X),roiPoint[2].Y+(dstImg.Height-roiPoint[2].Y));
dstQuad[2]=new CvPoint(-1*roiPoint[3].X,roiPoint[3].Y+(dstImg.Height-roiPoint[3].Y));