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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% function shadowSegmentFeatures = computeShadowSegmentFeatures（img seg varargin）
%  Computes features on the segments （superpixels） of the image （used only for the CRF）.
%
% Input parameters:
%  - img: input image
%  - seg: image segmentation
%
% Output parameters:
%  - shadowSegmentFeatures: segment features
%
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function shadowSegmentFeatures = computeShadowSegmentFeatures（img seg varargin）
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Copyright 2006-2010 Jean-Francois Lalonde
% Carnegie Mellon University
% Consult the LICENSE.txt file for licensing information
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%% Parse arguments
defaultArgs = struct（‘Verbose‘ 0 ‘InvRespFunction‘ [] ...
    ‘RGBHist‘ 0 ‘HistNbBins‘ 4 ‘Normalize‘ 0 ‘Equalize‘ 0）;
args = parseargs（defaultArgs varargin{:}）;

shadowSegmentFeatures = [];
tic;

%% Correct image for inverse response function
if ~isempty（args.InvRespFunction）
    myfprintf（args.Verbose ‘Applying inverse response function...‘）;
    img = correctImage（img args.InvRespFunction）;
end
imgPx = reshape（img size（img1）*size（img2） size（img3））;

segId = 1:max（seg（:））;
segIdToPxId = arrayfun（@（x） find（seg==x） segId ‘UniformOutput‘ 0）;

%% Compute RGB histogram
if args.RGBHist
    myfprintf（args.Verbose ‘Computing RGB histogram...‘）;
    histEdges = linspace（0 1 args.HistNbBins+1）; histEdges（end） = histEdges（end）+eps;
    histImg = cellfun（@（x） histc（imgPx（x:） histEdges 1） segIdToPxId ‘UniformOutput‘ 0）;
    histImg = cat（3 histImg{:}）;
    
    % drop last dimension
    histImg = histImg（1:end-1 : :）;
    
    % normalize
    histImg = histImg./repmat（sum（histImg 1） [size（histImg 1） 1 1]）;
    
    % reshape: [R1 G1 B1 R2 G2 B2 ...]
    shadowSegmentFeatures.RGBHist.hist = reshape（permute（histImg [3 2 1]） size（histImg 3） size（histImg2）*size（histImg1））;
    
    % compute mean as well
    meanImg = cellfun（@（x） mean（imgPx（x:） 1） segIdToPxId ‘UniformOutput‘ 0）;
    shadowSegmentFeatures.RGBHist.mean = cat（1 meanImg{:}）;
    
    if args.Normalize
        myfprintf（args.Verbose ‘Computing normalized features...‘）;
        % subtract mean divide by stdev
        meanSegmentColor = mean（shadowSegmentFeatures.RGBHist.mean 1）;
        stdSegmentColor = std（shadowSegmentFeatures.RGBHist.mean 1）;
        
        imgPxNew = imgPx - repmat（meanSegmentColor size（imgPx 1） 1）;
        imgPxNew = imgPxNew ./ repmat（stdSegmentColor size（imgPx 1） 1）;
        % re-center and rescale in [01] interval
        imgPxNew = imgPxNew + 0.5;
        imgPxNew = （imgPxNew - min（imgPxNew（:））） ./ （max（imgPxNew（:））-min（imgPxNew（:）））;
        imgNew = reshape（imgPxNew size（img））;
        
        tmpFeatures = computeShadowSegmentFeatures（imgNew segIdToPxId ‘RGBHist‘ 1 ‘Hist

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2017-05-24 03:11  DIP-PJ-master\
     文件       10244  2017-05-24 03:11  DIP-PJ-master\.DS_Store
     文件          40  2017-05-24 03:11  DIP-PJ-master\README.md
     文件        3738  2017-05-24 03:11  DIP-PJ-master\computeShadowSegmentFeatures.m
     文件         807  2017-05-24 03:11  DIP-PJ-master\convertBoundariesToPxInd.m
     文件         713  2017-05-24 03:11  DIP-PJ-master\convertDataFile.m
     目录           0  2017-05-24 03:11  DIP-PJ-master\data\
     文件        6148  2017-05-24 03:11  DIP-PJ-master\data\.DS_Store
     文件      258480  2017-05-24 03:11  DIP-PJ-master\data\bdt-eccv10-with-statistics-toolbox.mat
     文件      468425  2017-05-24 03:11  DIP-PJ-master\data\bdt-eccv10.mat
     文件      111205  2017-05-24 03:11  DIP-PJ-master\data\filterBank.mat
     目录           0  2017-05-24 03:11  DIP-PJ-master\data\img\
     文件      204478  2017-05-24 03:11  DIP-PJ-master\data\img\img-groundProb.mat
     文件       97774  2017-05-24 03:11  DIP-PJ-master\data\img\img.jpg
     文件       47492  2017-05-24 03:11  DIP-PJ-master\data\univTextons_128.mat
     文件        3518  2017-05-24 03:11  DIP-PJ-master\demoShadowDetection.m
     目录           0  2017-05-24 03:11  DIP-PJ-master\display\
     文件         727  2017-05-24 03:11  DIP-PJ-master\display\displayBoundaries.m
     文件        1124  2017-05-24 03:11  DIP-PJ-master\display\displayBoundariesProb.m
     文件        1656  2017-05-24 03:11  DIP-PJ-master\extractImageBoundaries.m
     文件        2298  2017-05-24 03:11  DIP-PJ-master\getBoundaryIndicesFromEdges.m
     文件        1767  2017-05-24 03:11  DIP-PJ-master\getPathName.m
     文件         444  2017-05-24 03:11  DIP-PJ-master\grad2wseg.m
     文件         814  2017-05-24 03:11  DIP-PJ-master\interpBoundarySubPixel.m
     文件         304  2017-05-24 03:11  DIP-PJ-master\myfprintf.m
     文件        6292  2017-05-24 03:11  DIP-PJ-master\selectBoundaryFeatures.m
     文件         444  2017-05-24 03:11  DIP-PJ-master\selectImageFeatures.m
     文件         811  2017-05-24 03:11  DIP-PJ-master\setPath.m
     文件        6941  2017-05-24 03:11  DIP-PJ-master\shadow_removal.m
     文件         131  2017-05-24 03:11  DIP-PJ-master\skewness.m