1| #include <iostream.h>
  2| #include <stdlib.h>
  3| #include "camellia.h"
  4| 
  5| extern "C" int sortfunc(const void *a, const void *b)
  6| {
  7|     CamBlobInfo *ba=(CamBlobInfo*)a;
  8|     CamBlobInfo *bb=(CamBlobInfo*)b;
  9|     return bb->surface-ba->surface;
 10| }
 11| 
 12| void cpp_example_labeling()
 13| {
 14|     CamImage image,yuv;
 15|     
 16|     // Load picture alfa156.bmp
 17|     image.load_bmp("resources/alfa156.bmp");    
 18|     image.to_yuv(yuv);
 19|     
 20|     // Consider V plane only
 21|     CamROI roi(3,0,0,yuv.width,yuv.height);
 22|     yuv.set_roi(roi);
 23|     
 24|     // Threshold and encode
 25|     CamRLEImage thr;
 26|     yuv.encode_threshold(thr,150);
 27| 
 28|     // Labeling
 29|     CamBlobs blobs;
 30|     thr.labeling(blobs);
 31|     
 32|     // Print info
 33|     std::cout<<blobs.nbBlobs<<" blobs detected"<<std::endl;
 34|     
 35|     // Draw rectangles on all detected blobs
 36|     for (int i=0;i<blobs.nbBlobs;i++) {
 37|         image.draw_rectangle(blobs[i].left, blobs[i].top,
 38|             blobs[i].left+blobs[i].width-1, blobs[i].top+blobs[i].height-1,
 39|             CAM_RGB(255,0,0));
 40|     }
 41|     image.save_bmp("output/alfa156_labeling.bmp");
 42|     
 43|     // Find out the biggest blob
 44|     qsort((void*)blobs.blobInfo,blobs.nbBlobs,sizeof(CamBlobInfo),sortfunc);
 45|     std::cout<<"The bigger blob is at position ("<<blobs[0].cx<<","<<blobs[0].cy<<") and its surface is "<<blobs[0].surface<<" pixels"<<std::endl;
 46| }