无法将uchar ptr转换为opencvsharp

Question

您好我正在使用visual studio 2008和C++来实现它的分水岭算法。但是我最近正在将相同的代码转换为使用visual studio中的opencvsharp包装类的c＃我完成了大部分代码，但我无法将uchar ptr转换为opencvsharp，我甚至使用字节数据类型，但它不起作用。

这里是链接到C++源代码

code.ros.org/trac/opencv/browser/trunk/opencv/samples/c/watershed.cpp?rev=493

，这是从哪里获得的麻烦

uchar* ptr = color_tab->data.ptr + i*3; 
      ptr[0] = (uchar)(cvRandInt(&rng)%180 + 50); 
      ptr[1] = (uchar)(cvRandInt(&rng)%180 + 50); 
      ptr[2] = (uchar)(cvRandInt(&rng)%180 + 50); 

任何帮助将不胜感激。谢谢。

这里是C＃代码我一直在工作，我不能完成代码的任何帮助

using (IplImage img0 = new IplImage("1180.jpg", LoadMode.AnyDepth | LoadMode.AnyColor)){ 
     using (IplImage img = img0.Clone()) 
     using (IplImage marker_mask = new IplImage(img0.Size, BitDepth.U8, 1)) 
     using (IplImage markers = new IplImage(img.Size, BitDepth.S32, 1)) 
     using (IplImage img_gray = img0.Clone()) 

      using (IplImage wshed = img0.Clone()){ 
      wshed.Zero(); 
      marker_mask.Zero(); 

       using (CvWindow w_image = new CvWindow("image", WindowMode.AutoSize, img)) 
        { 
        CvPoint prev_pt = new CvPoint(-1, -1); 
         w_image.OnMouseCallback += delegate(MouseEvent ev, int x, int y, MouseEvent flags) 
         { 
          if (ev == MouseEvent.LButtonUp || (flags & MouseEvent.FlagLButton) == 0) 
          { 
           prev_pt = new CvPoint(-1, -1); 
          } 
          else if (ev == MouseEvent.LButtonDown) 
          { 
           prev_pt = new CvPoint(x, y); 
          } 
          else if (ev == MouseEvent.MouseMove && (flags & MouseEvent.FlagLButton) != 0) 
          { 
           CvPoint pt = new CvPoint(x, y); 
           if (prev_pt.X < 0) 
           { 
            prev_pt = pt; 
           } 

           marker_mask.Line(prev_pt,pt,Cv.ScalarAll(255),5,LineType.Link8,0); 
           img.Line(prev_pt,pt,Cv.ScalarAll(255),5,LineType.Link8,0); 
           prev_pt = pt; 
           w_image.ShowImage(img); 
          } 
         }; 

        for (; ;) 
         { 
          switch (CvWindow.WaitKey(0)) 
          { 
           case 27:  
            return; 
           case 'r': 
            marker_mask.Zero(); 
            img0.Copy(img); 
            w_image.ShowImage(img); 
            break; 
            case 'w': 
            case '\r': 

            CvSeq<CvPoint> contours; 
            CvMat color_tab=null; 
            int i,j,comp_count=0; 

            CvMemStorage storage = new CvMemStorage(); 
            Cv.FindContours(marker_mask,storage, out contours); 
            markers.Zero(); 

            for(; contours !=null; contours=contours.HNext,comp_count++){ 

             Cv.DrawContours(markers, contours, Cv.ScalarAll(comp_count+1), Cv.ScalarAll(comp_count+1),-1,-1,LineType.Link8,new CvPoint(0,0)); 

            } 

            if(comp_count ==0){ 
            continue; 

             color_tab=Cv.CreateMat(1,comp_count,MatrixType.U8C3); 

             for(i=0;i<comp_count;i++){ 
              /* 
              uchar* ptr = color_tab->data.ptr + i*3; 
              ptr[0] = (uchar)(cvRandInt(&rng)%180 + 50); 
              ptr[1] = (uchar)(cvRandInt(&rng)%180 + 50); 
              ptr[2] = (uchar)(cvRandInt(&rng)%180 + 50); 
              */ 


             } 
             { 
              double t =(double)Cv.GetTickCount(); 
              Cv.Watershed(img0,markers); 
              Cv.Save(markers,"img0.xml"); 
              t=(double)Cv.GetTickCount()-t; 
              Console.WriteLine("exec time = %gms\n",t/(Cv.GetTickFrequency()*1000)); 
             } 
             // paint the watershed image 
             for(i=0;i<markers.Height;i++) 
              for(j=0;i<markers.Width;j++) 
             { 
             int idx = 

             } 
               Cv.AddWeighted(wshed,0.5,img_gray,0.5,0,wshed); 
               Cv.ShowImage("watershed transform",wshed); 
               Cv.ReleaseMat(color_tab); 
            } 


            } 

            return 0; 
     } 



    } 
} 

感谢torak，但似乎它不工作我修改了C＃这样的代码

unsafe{ 

               CvRNG rng = new CvRNG(); 

              byte* ptr = (byte*)color_tab.Data.ptr +i*3; 

              ptr[0] = (byte)(Cv.RandInt(rng)%180 + 50); 
              ptr[1] = (byte)(Cv.RandInt(rng)%180 + 50); 
              ptr[2] = (byte)(Cv.RandInt(rng)%180 + 50); 

              } 

它没有给出任何错误，但我不确定有关输出我现在有一个新问题。我无法将C++代码中的宏CV_IMAGE_ELEM（）转换为C＃。任何人都可以帮助。感谢您的评论

这是我得到的问题

// paint the watershed image 
     for(i = 0; i < markers->height; i++) 
      for(j = 0; j < markers->width; j++) 
      { 
       int idx = CV_IMAGE_ELEM(markers, int, i, j);//markersIPL_DEPTH_32S 
       uchar* dst = &CV_IMAGE_ELEM(wshed, uchar, i, j*3);//BGR,j*3 
       if(idx == -1) //-1? 
        dst[0] = dst[1] = dst[2] = (uchar)255; 
       else if(idx <= 0 || idx > comp_count) // 
        dst[0] = dst[1] = dst[2] = (uchar)0; // should not get here 
       else // 
       { 
        uchar* ptr = color_tab->data.ptr + (idx-1)*3; 
        dst[0] = ptr[0]; dst[1] = ptr[1]; dst[2] = ptr[2]; 
       } 
      } 

Answer 1

的开始显示快速浏览一下后在C++ code.full C++代码的麻烦，似乎这样你的数据使用的color_tab适当DataArray...成员。你的情况，这将是color_tab.DataArrayByte[...]生产类似：

for (i = 0; i < comp_count * 3; i++) 
    ptr[i] = (byte)(cvRandInt(...) % 180 + 50); 

我没有看过的随机数生成，因此我不能在此刻测试，但我怀疑它解决您的问题。手指交叉。