get_features.m

function [feature_pixels, support_sz] = get_features(image, features, gparams, fg_size )

if ~ iscell(features)
    features = {features};
end;

[im_height, im_width, num_im_chan, num_images] = size(image);

colorImage = num_im_chan == 3;


%compute total dimension of all features
tot_feature_dim = 0;
for n = 1:length(features)
    
    if ~isfield(features{n}.fparams,'useForColor')
        features{n}.fparams.useForColor = true;
    end;
    
    if ~isfield(features{n}.fparams,'useForGray')
        features{n}.fparams.useForGray = true;
    end;
    
    if (features{n}.fparams.useForColor && colorImage) || (features{n}.fparams.useForGray && ~colorImage)
        tot_feature_dim = tot_feature_dim + features{n}.fparams.nDim;
    end;
    
end;

if nargin < 4 || isempty(fg_size)
    if gparams.cell_size == -1
        fg_size = size(features{1}.getFeature(image,features{1}.fparams,gparams));
    else
        fg_size = [floor(im_height/gparams.cell_size), floor(im_width/gparams.cell_size)];
    end
end

% temporary hack for fixing deep features
if gparams.cell_size == -1
    cf = features{1};
    if (cf.fparams.useForColor && colorImage) || (cf.fparams.useForGray && ~colorImage)
        [feature_pixels, support_sz] = cf.getFeature(image,cf.fparams,gparams);
    end;
else
    %compute the feature set
    feature_pixels = zeros(fg_size(1),fg_size(2),tot_feature_dim, num_images, 'single');
    
    currDim = 1;
    for n = 1:length(features)
        cf = features{n};
        if (cf.fparams.useForColor && colorImage) || (cf.fparams.useForGray && ~colorImage)
            feature_pixels(:,:,currDim:(currDim+cf.fparams.nDim-1),:) = cf.getFeature(image,cf.fparams,gparams);
            currDim = currDim + cf.fparams.nDim;
        end;
    end;
    support_sz = [im_height, im_width];
end

end