hovwEncodingCustom.m

function [] = hovwEncodingCustom(params, training_set, query_set)
% HOVWENCODINGCUSTOM Histogram of Visual Words encoding. Creates histograms
% with codebook entries (visual words) frequencies by leaving one of the
% passes out.

% Authors: Jose Rivera-Rubio and Ioannis Alexiou
%          {jose.rivera,ia2109}@imperial.ac.uk
%
% Initial version: April, 2014
% Last Modified: Otober, 2015

% CONSTANT PARAMETERS
selector  = params.passes; % Leave one out strategy pass selector.

% Path strings, modify if NOT using the default suggested paths.

desc_str  = 'C%dP%d_Descriptors.mat';
dict_str  = 'dictionary_C%d_P%s.mat';
dict_path = fullfile(params.dictPath,num2str(params.dictionarySize));


% Construct dictionary path and load vocabulary.
c = ['C' num2str(params.corridors)];
dictionaries_path = fullfile(dict_path,params.descriptor,c);

training_set_str = sprintf('%d',training_set);
dict_fname_str = sprintf(dict_str,params.corridors,training_set_str);

load(fullfile(dictionaries_path,dict_fname_str)); % Load VWords

% Load query descriptors

for pass = query_set
    
    p = ['P' num2str(pass)]; % pass string
    
    descriptors_path = fullfile(params.descrDir,params.descriptor,c,p);
    
    descriptors_fname_str = sprintf(desc_str,params.corridors,pass);
    
    write_path = fullfile(dictionaries_path,...
        ['hovw_' params.encoding '_' c '_P' training_set_str '_' num2str(pass) '.mat']);
    
    if (~exist(write_path, 'file'))

        while true
            try
                load(fullfile(descriptors_path,descriptors_fname_str)); % Load DescriptorStack
                break
            catch
                fail_msg = ['Failed to load descriptor ' c p];
                disp(fail_msg);
            end % end try/catch
        end
        
        % Encode descriptors with dictionary: vector quantisation
        
        if strcmpi(params.descriptor,'SIFT')
            fun_str = ['encode_hovw_' params.encoding '_sparse(VWords,DescriptorStack)'];
            HoVW = eval(fun_str);
        else
            fun_str = ['encode_hovw_' params.encoding '(VWords,DescriptorStack)'];
            HoVW = eval(fun_str);
        end
        
        save(write_path,'HoVW');
        
        disp( ['Pass ' p]);
    end
end % end pass for loop
disp(['All passes encoded for dictionary ' training_set_str ' and corridor ' c]);


end % end hovw_encoding