% makeFeaturePyramids - creates a pyramid for featureType.%% pyrs = makeFeaturePyramids(img,featureType,salParams,varargin)%    Creates a feature pyramid with the parameters:%      img: the Image structure for the source image.%      featureType: what feature ('Intensity','Color','Orientation',%                  'Hue','Skin','TopDown');%      salParams: the saliency parameters for this operation;%      varargin: additional info, depending on the featureType:%        'Orientation': varargin{1} may hold an auxiliary %                       intensity pyramid;%        'TopDown': varargin{1} must hold a vector of auxiliary %                   maps for top-down attention;%        'Hue': varargin{1} must contain hueParams.%%    pyrs: a vector of pyramids of type featureType.%% See also makeSaliencyMap, dataStructures.% This file is part of the SaliencyToolbox - Copyright (C) 2006-2007% by Dirk B. Walther and the California Institute of Technology.% See the enclosed LICENSE.TXT document for the license agreement. % More information about this project is available at: % http://www.saliencytoolbox.netfunction pyrs = makeFeaturePyramids(img,featureType,salParams,varargin)% These feature types require color images:colorTypes = {'Color','Hue','Skin'};if (ismember(featureType,colorTypes) && img.dims == 2)  % not a color image for color type? terminate with error  fprintf(['Feature ''' featureType ''' requires a color image!\n' ...           'Use a color image or remove this feature from the\n' ...           'saliency parameters!\n']);  error('Could not process image.');endswitch featureType    case {'Intensity','Intensities'}    pyrs = makeIntensityPyramid(img,salParams.pyramidType);  case 'Color'    pyrs(1) = makeRedGreenPyramid(img,salParams.pyramidType);    pyrs(2) = makeBlueYellowPyramid(img,salParams.pyramidType);  case {'Orientation','Orientations'}    % varargin{1} could be an intensity pyramid, otherwise have to make one    intPyr = [];    if (~isempty(varargin))      if (strcmp('Intensity',varargin{1}.label))        intPyr = varargin{1};      end    end    if (isempty(intPyr))      intPyr = makeIntensityPyramid(img,salParams.pyramidType);    end    for ori = 1:length(salParams.oriAngles)      pyrs(ori) = makeOrientationPyramid(intPyr,...                  salParams.gaborParams,salParams.oriAngles(ori));    end        case 'Hue'    % varargin{1} must contain the hueParams    if (isempty(varargin))      fatal('varargin{1} must contain hueParams for Hue Channel');    end     % varargin{2} might contain an alternative label    if (length(varargin >= 2))      pyrs = makeHuePyramid(img,salParams.pyramidType,varargin{1},varargin{2});    else      pyrs = makeHuePyramid(img,salParams.pyramidType,varargin{1});    end        case 'Skin'    pyrs = makeHuePyramid(img,salParams.pyramidType,skinHueParams,'Skin');      case 'TopDown'    if isempty(varargin)      fatal('varargin{1} must contain a vector of TopDown maps');    end    % this is a dummy function that simply copies the auxiliary pyramids    pyrs = varargin{1};        otherwise    fatal(['Unknown feature: ' featureType]);end