function fvTrain = readFeatures(par)

fvTrain = [];

path = sprintf('%s*.jpg',par.directoriImatges);
images = dir(path);

used = zeros(1,size(images,1));
        
for j=1:par.nPosImages

    index = round(rand(1)*size(images,1));
    while index ==0 || used(1,index)
        index = round(rand(1)*size(images,1));
    end
    used(1,index) = 1;
    s = sprintf('%s%s',par.directoriImatges,images(index).name);
    I = imread(s);             
    if par.BW==0 && size(I,3)==3, I = rgb2gray(I); end    
    if size(I,3)< 3 && par.BW==1
        file = sprintf('%s%s.V.sift',par.directoriSift,images(index).name);
        fv = llegirFitxer(file);
        h = zeros(size(fv,1),128);
        fv = [fv h h];
    end
    if size(I,3)==3 && par.BW==1
        file = sprintf('%s%s.H.sift',par.directoriSift,images(index).name);
        fv = llegirFitxer(file);
                
        file = sprintf('%s%s.S.sift',par.directoriSift,images(index).name);
        fv = [fv llegirFitxer(file)];
                
        file = sprintf('%s%s.V.sift',par.directoriSift,images(index).name);
        fv = [fv llegirFitxer(file)];
    end
    if size(I,3)< 3 && par.BW==0
        file = sprintf('%s%s.sift',par.directoriSift,images(index).name);
        fv = llegirFitxer(file);
    end

    usedfeatures = zeros(1,size(fv,1));
    if par.nFeatures <=size(fv,1)
        for k=1:par.nFeatures
            index = round(rand(1)*size(fv,1));
            while index ==0 || usedfeatures(1,index)
                index = round(rand(1)*size(fv,1));
            end
            fvTrain = [fvTrain; fv(index,:)];
        end
    else
        fvTrain = [fvTrain;fv];
    end
end

fvTrain = fvTrain';