bool brightRGB::getMax(const image& img,dvector& dest) const{

    // image empty?
    if (img.empty()) {
      setStatusString("image empty");
      dest.resize(0);
      return false;
    }

    const rgbPixel transColor = getParameters().transColor;
    ivector maxV(3,-1);
    image::const_iterator it = img.begin();
    if(getParameters().transparent) {
      while(it != img.end()) {
	if(*it != transColor) {
	  if((*it).getRed() > maxV.at(0))
	    maxV.at(0) = (*it).getRed();
	  if((*it).getGreen() > maxV.at(1))
	    maxV.at(1) = (*it).getGreen();
	  if((*it).getBlue() > maxV.at(2))
	    maxV.at(2) = (*it).getBlue();
	}
	it++;
      }
      // only transparent pixels?
      if (maxV.at(0)==-1) {
        setStatusString("only transparent pixels");
        dest.resize(0);
        return false;
      }
    } else { // no transparent color
      while(it != img.end()) {
	if((*it).getRed() > maxV.at(0))
	  maxV.at(0) = (*it).getRed();
	if((*it).getGreen() > maxV.at(1))
	  maxV.at(1) = (*it).getGreen();
	if((*it).getBlue() > maxV.at(2))
	  maxV.at(2) = (*it).getBlue();
	it++;
      }
    }
    if(maxV.at(0) == -1)
      return false;
    dest.castFrom(maxV);
    // normalize to 0..1
    dest.divide(255);
    return true;
  };
  bool brightRGB::getAverage(const image& img,dvector& dest) const{

    const rgbPixel transColor = getParameters().transColor;
    dvector avg(3,0.0);
    image::const_iterator it = img.begin();
    // check for empty image
    if (img.columns()==0 || img.rows()==0) {
      setStatusString("image empty");
      dest.resize(0);
      return false;
    }
    if(getParameters().transparent) {
      int counter = 0;
      while(it != img.end()) {
	if(*it != transColor) {
	  avg.at(0) += (*it).getRed();
	  avg.at(1) += (*it).getGreen();
	  avg.at(2) += (*it).getBlue();
	  ++counter;
	}
	it++;
      }
      // check for completely transparent image
      if (counter==0) {
        setStatusString("only transparent pixels");
        dest.resize(0);
        return false;
      }
      avg.divide(counter);
    } else { // no transparent color
      while(it != img.end()) {
	avg.at(0) += (*it).getRed();
	avg.at(1) += (*it).getGreen();
	avg.at(2) += (*it).getBlue();
	it++;
      }
      avg.divide(img.columns()*img.rows());
    }
    // values between 0 and 1
    dest.divide(avg, 255.);
    return true;
  };
Exemple #3
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image::image(const image& src)
{
  _alloc(src.width(), src.height());
  std::copy(src.begin(), src.end(), begin());
}
  bool brightRGB::getMedian(const image& img,dvector& dest) const{


    // image empty?
    if (img.empty()) {
      setStatusString("image empty");
      dest.resize(0);
      return false;
    }

    const rgbPixel transColor = getParameters().transColor;
    dest.resize(3);
    ivector hist0(256,0);
    ivector hist1(256,0);
    ivector hist2(256,0);
    image::const_iterator it = img.begin();
    if(getParameters().transparent) {
      while(it != img.end()) {
  	if(*it != transColor) {
	  ++hist0.at((*it).getRed());
	  ++hist1.at((*it).getGreen());
	  ++hist2.at((*it).getBlue());
	}
	it++;
      }
      const int counterHalf = hist0.sumOfElements()/2;
      // check for complete image transparent
      if (counterHalf==0) {
        setStatusString("only transparent pixels");
        dest.resize(0);
        return false;
      }

      int i,s;
      i=-1,s=0;
      while(++i<256 && s<counterHalf) {
	s += hist0.at(i);
      }
      dest.at(0) = i-1;
      i=-1,s=0;
      while(++i<256 && s<counterHalf) {
	s += hist1.at(i);
      }
      dest.at(1) = i-1;
      i=-1,s=0;
      while(++i<256 && s<counterHalf) {
	s += hist2.at(i);
      }
      dest.at(2) = i-1;
    } else { // no transparent color
      while(it != img.end()) {
	  ++hist0.at((*it).getRed());
	  ++hist1.at((*it).getGreen());
	  ++hist2.at((*it).getBlue());
	it++;
      }
      const int counterHalf = img.columns()*img.rows()/2;
      int i,s;
      i=-1,s=0;
      while(++i<256 && s<counterHalf) {
	s += hist0.at(i);
      }
      dest.at(0) = i-1;
      i=-1,s=0;
      while(++i<256 && s<counterHalf) {
	s += hist1.at(i);
      }
      dest.at(1) = i-1;
      i=-1,s=0;
      while(++i<256 && s<counterHalf) {
	s += hist2.at(i);
      }
      dest.at(2) = i-1;
    }

    // normalize to 0..1
    dest.divide(255);

    return true;
  };