std::vector<int> Histogram::getThresh(cv::Mat image, float s1, float s2){
cv::Mat histMat = BuildHistogram (image);
std::vector<int> imgThresh;
imgThresh.push_back(0);
imgThresh.push_back(255);
float N = image.rows * image.cols;
float maxth = (1-s2)*N;
float minth = s1*N;
int mini=0,maxi=0;
float cmini=0,cmaxi=N;
bool lower=true,higher=true;
for (int i = 0; i < histMat.rows; i++){
cmini+= histMat.at<float>(i);
cmaxi-= histMat.at<float>(256-i);
if(cmini >= minth && lower==true){
mini = i;
lower=false;
}
if(cmaxi <= maxth && higher==true){
maxi = 256-i;
higher=false;
}
if(lower==false && higher ==false )
break;
}
imgThresh[0]=mini;
imgThresh[1]=maxi;
return imgThresh;
}
void SaveXPM( IndexedImg& img, RGBx* palette, char* filename )
{
// use same chars as gimp
static const char linenoise [] =
" .+@#$%&*=-;>,')!~{]^/(_:<[}|1234567890abcdefghijklmnopqrstuvwxyz\
ABCDEFGHIJKLMNOPQRSTUVWXYZ`";
XpmImage outimage;
XpmInfo outinfo = { 0,NULL,NULL,NULL,0,0,0,NULL };
int hist[256];
BuildHistogram( img, hist );
int usedcolors = CountUsedColours( hist );
outimage.width = img.W();
outimage.height = img.H();
outimage.cpp = cpp;
outimage.ncolors = usedcolours;
outimage.colorTable = 0;
outimage.data = stringbuf;
}
