colorDec

private void RecDetection(Image<Gray, Byte> img, Image<Bgr, Byte> showRecOnImg, int areaV)
         {
             Image<Gray, Byte> imgForContour = new Image<Gray, byte>(img.Width, img.Height);
             CvInvoke.cvCopy(img, imgForContour, System.IntPtr.Zero);


             IntPtr storage = CvInvoke.cvCreateMemStorage(0);
             IntPtr contour = new IntPtr();

             CvInvoke.cvFindContours(
                 imgForContour,
                 storage,
                 ref contour,
                 System.Runtime.InteropServices.Marshal.SizeOf(typeof(MCvContour)),
                 Emgu.CV.CvEnum.RETR_TYPE.CV_RETR_EXTERNAL,
                 Emgu.CV.CvEnum.CHAIN_APPROX_METHOD.CV_CHAIN_APPROX_NONE,
                 new Point(0, 0));


             Seq<Point> seq = new Seq<Point>(contour, null);

             for (; seq != null && seq.Ptr.ToInt64() != 0; seq = seq.HNext)
             {
                 Rectangle bndRec = CvInvoke.cvBoundingRect(seq, 2);
                 double areaC = CvInvoke.cvContourArea(seq, MCvSlice.WholeSeq, 1) * -1;
                 if (areaC > areaV)
                 {
                     CvInvoke.cvRectangle(showRecOnImg, new Point(bndRec.X, bndRec.Y),
                         new Point(bndRec.X + bndRec.Width, bndRec.Y + bndRec.Height),
                         new MCvScalar(0, 0, 255), 1, LINE_TYPE.CV_AA, 0);
                    
                 }

             }
             pbSrc.Image = showRecOnImg.ToBitmap();

         }