image image::operator/(const image& img) const
{
// sanity check
assert(width() == img.width() && height() == img.height());
// create result
image result(width(), height());
std::transform(begin(), end(), img.begin(), result.begin(), std::divides<color>());
// Done.
return result;
}
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;
};
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;
};
