CompilePyramid.m

function [ pyramid_all ] = CompilePyramid(imageFileList,dataBaseDir,textonSuffix, dictionarySize,pyramidLevels,name, params);
%function [ pyramid_all ] = CompilePyramid( imageFileList, dataBaseDir, textonSuffix, dictionarySize, pyramidLevels, canSkip )
%
% Generate the pyramid from the texton lablels
%
% For each image the texton labels are loaded. Then the histograms are
% calculated for the finest level. The rest of the pyramid levels are
% generated by combining the histograms of the higher level.
%
% imageFileList: cell of file paths
% dataBaseDir: the base directory for the data files that are generated
%  by the algorithm. If this dir is the same as imageBaseDir the files
%  will be generated in the same location as the image file
% textonSuffix: this is the suffix appended to the image file name to
%  denote the data file that contains the textons indices and coordinates. 
%  Its default value is '_texton_ind_%d.mat' where %d is the dictionary
%  size.
% dictionarySize: size of descriptor dictionary (200 has been found to be
%  a good size)
% pyramidLevels: number of levels of the pyramid to build
% canSkip: if true the calculation will be skipped if the appropriate data 
%  file is found in dataBaseDir. This is very useful if you just want to
%  update some of the data or if you've added new images.

fprintf('Compiling Pyramid\n');

pyramid_all = [];

for f = 1:size(imageFileList,1)
    %% load image
    imageFName = imageFileList{f};
    [dirN base] = fileparts(imageFName);
    baseFName = fullfile(dirN, base);
    
    outFName = fullfile(dataBaseDir, sprintf('%s_pyramid_%d_%d_%d_%d_%s.mat', baseFName, dictionarySize, pyramidLevels, ...
	params.max_pooling, params.sum_norm, name));
    if(size(dir(outFName),1)~=0 && params.can_skip && params.can_skip_compilepyramid)
        fprintf('Skipping (compile pyramid) %s\n', imageFName);
        load(outFName, 'pyramid');
        pyramid_all = [pyramid_all; pyramid];
        continue;
    end
    
    %% load texton indices
    in_fname = fullfile(dataBaseDir, sprintf('%s%s', baseFName, textonSuffix));
    load(in_fname, 'texton_ind');
    
    %% get width and height of input image
    wid = texton_ind.wid;
    hgt = texton_ind.hgt;

    fprintf('Loaded (compile_pyramid) %s: wid %d, hgt %d\n', ...
             imageFName, wid, hgt);

    pyramid=sparse(1,texton_ind.data,1,1,dictionarySize);

    if params.max_pooling
      pyramid = (pyramid > .1);
    end

    if params.sum_norm
      pyramid = pyramid / sum(sum(pyramid));
    else
      pyramid = pyramid/ norm(double(pyramid));
    end

    % save pyramid
    save(outFName, 'pyramid');

    pyramid_all = [pyramid_all; pyramid];
end % f

outFName = fullfile(dataBaseDir, sprintf('pyramids_all_%d_%d_%d_%d.mat', dictionarySize, pyramidLevels,...
	params.max_pooling, params.sum_norm));
save(outFName, 'pyramid_all');


end