cvcolor.cpp

// Copyright (C) 2007 by Cristóbal Carnero Liñán
// grendel.ccl@gmail.com
//
// This file is part of cvBlob.
//
// cvBlob is free software: you can redistribute it and/or modify
// it under the terms of the Lesser GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// cvBlob is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// Lesser GNU General Public License for more details.
//
// You should have received a copy of the Lesser GNU General Public License
// along with cvBlob.  If not, see <http://www.gnu.org/licenses/>.
//

#include <cmath>
#include <iostream>
using namespace std;

#if (defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__) || defined(__WINDOWS__) || (defined(__APPLE__) & defined(__MACH__)))
#include <cv.h>
#else
#include <opencv/cv.h>
#endif

#include "cvblob.h"

namespace cvb
{

  CvScalar cvBlobMeanColor(CvBlob const *blob, IplImage const *imgLabel, IplImage const *img)
  {
    CV_FUNCNAME("cvBlobMeanColor");
    __CV_BEGIN__;
    {
      CV_ASSERT(imgLabel&&(imgLabel->depth==IPL_DEPTH_LABEL)&&(imgLabel->nChannels==1));
      CV_ASSERT(img&&(img->depth==IPL_DEPTH_8U)&&(img->nChannels==3));

      int stepLbl = imgLabel->widthStep/(imgLabel->depth/8);
      int stepImg = img->widthStep/(img->depth/8);
      int imgLabel_width = imgLabel->width;
      int imgLabel_height = imgLabel->height;
      int imgLabel_offset = 0;
      int img_width = img->width;
      int img_height = img->height;
      int img_offset = 0;
      if(imgLabel->roi)
      {
	imgLabel_width = imgLabel->roi->width;
	imgLabel_height = imgLabel->roi->height;
	imgLabel_offset = (imgLabel->nChannels * imgLabel->roi->xOffset) + (imgLabel->roi->yOffset * stepLbl);
      }
      if(img->roi)
      {
	img_width = img->roi->width;
	img_height = img->roi->height;
	img_offset = (img->nChannels * img->roi->xOffset) + (img->roi->yOffset * stepImg);
      }

      CvLabel *labels = (CvLabel *)imgLabel->imageData + imgLabel_offset;
      unsigned char *imgData = (unsigned char *)img->imageData + img_offset;

      double mb = 0;
      double mg = 0;
      double mr = 0;
      double pixels = (double)blob->area;

      for (unsigned int r=0; r<(unsigned int)imgLabel_height; r++, labels+=stepLbl, imgData+=stepImg)
	for (unsigned int c=0; c<(unsigned int)imgLabel_width; c++)
	{
	  if (labels[c]==blob->label)
	  {
	    mb += ((double)imgData[img->nChannels*c+0])/pixels; // B
	    mg += ((double)imgData[img->nChannels*c+1])/pixels; // G
	    mr += ((double)imgData[img->nChannels*c+2])/pixels; // R
	  }
	}

      /*double mb = 0;
      double mg = 0;
      double mr = 0;
      double pixels = (double)blob->area;
      for (unsigned int y=0; y<imgLabel->height; y++)
	for (unsigned int x=0; x<imgLabel->width; x++)
	{
	  if (cvGetLabel(imgLabel, x, y)==blob->label)
	  {
	    CvScalar color = cvGet2D(img, y, x);
	    mb += color.val[0]/pixels;
	    mg += color.val[1]/pixels;
	    mr += color.val[2]/pixels;
	  }
	}*/

      return cvScalar(mr, mg, mb);
    }
    __CV_END__;
  }

}