void LocalFeatureExtractor::extractPatches(ImageFeature &img, const ::std::vector<FeatureExtractionPosition> &positions, LocalFeatures &lf) {
if(settings_.padding>0) {
img=zeropad(img,settings_.padding, settings_.padding);
}
lf.winsize_=settings_.winsize;
lf.padding_=settings_.padding;
lf.numberOfFeatures_=positions.size();
lf.zsize_=img.zsize();
int windiameter=2*settings_.winsize+1;
lf.dim_=windiameter*windiameter*img.zsize();
lf.imageSizeX_=img.xsize();
lf.imageSizeY_=img.ysize();
lf.filename_=img.filename();
int savesize=settings_.winsize*2+1;
lf.positions_=positions;
lf.data_.resize(positions.size());
for(uint i=0;i<positions.size();++i) {
const FeatureExtractionPosition &pos=positions[i];
ImageFeature p=getPatch(img,pos.x,pos.y,pos.s);
if(uint(pos.s)!=settings_.winsize) {
p=scale(p,savesize,savesize);
}
lf.data_[i]=toVector(p);
}
}
void LocalFeatureExtractor::extractHisto(ImageFeature &img, const ::std::vector<FeatureExtractionPosition> &positions, LocalFeatures &lf) {
uint n_colors;
if(settings_.forceGray == true)
n_colors = 1;
else
n_colors = 3;
// Extract patches
if(settings_.padding>0) {
img=zeropad(img,settings_.padding, settings_.padding);
}
lf.winsize_=settings_.winsize;
lf.padding_=settings_.padding;
lf.numberOfFeatures_=positions.size();
lf.zsize_=img.zsize();
int windiameter=2*settings_.winsize+1;
if(n_colors == 1)
lf.dim_=settings_.histosteps;
else if(n_colors == 3)
lf.dim_=settings_.histosteps*settings_.histosteps*settings_.histosteps;
lf.imageSizeX_=img.xsize();
lf.imageSizeY_=img.ysize();
lf.filename_=img.filename();
int savesize=settings_.winsize*2+1;
lf.positions_=positions;
lf.data_.resize(positions.size());
uint steps=settings_.histosteps;
for(uint i=0;i<positions.size();++i) {
const FeatureExtractionPosition &pos=positions[i];
ImageFeature p=getPatch(img,pos.x,pos.y,pos.s);
if(uint(pos.s)!=settings_.winsize) {
p=scale(p,savesize,savesize);
}
// Histogramize patch
HistogramFeature histo(vector<uint>(n_colors,steps));
histo.min()=vector<double>(n_colors,0.0);
histo.max()=vector<double>(n_colors,1.0);
histo.initStepsize();
vector<double> tofeed(n_colors);
for(uint x=0;x<p.xsize();++x) {
for(uint y=0;y<p.ysize();++y) {
for(uint c=0;c<n_colors;++c) {
tofeed[c]=p(x,y,c);
}
histo.feed(tofeed);
}
}
lf.data_[i]=histo.data();
}
}