MATLAB: Grouping the pixel having same values

image procesing

I have a RGB image in which i have taken some pixel values for example
 83   81   81   84   85   84   82   82   84   81   83   83   81   81   
 83   81   81   83   83   82   80   81   83   80   82   83   81   79   
 81   79   83   84   84   84   81   81   82   80   81   81   79   79   
 79   80   82   86   85   84   83   83   85   85   81   81   79   79   
 79   81   84   85   85   83   83   83   84   83   81   83   81   81   
 84   83   84   85   85   83   84   80   81   81   81   82   82   83   
 83   84   86   85   85   83   84   80   79   80   82   82   81   83
for exmaple first value is 83,neighbour value is also 83 so it must be grouped(2 values will be grouped),next value 81(4 values of 81 it must be grouped )then next value is 85 there is no other neighbour value of 85 so it must be grouped as single vaue(1 value will be there),please help how to process
the pixel having same neighbour values must be grouped
please help

Best Answer

I =[83   81   81   84   85   84   82   82   84   81   83   83   81   81
83   81   81   83   83   82   80   81   83   80   82   83   81   79
81   79   83   84   84   84   81   81   82   80   81   81   79   79
79   80   82   86   85   84   83   83   85   85   81   81   79   79
79   81   84   85   85   83   83   83   84   83   81   83   81   81
84   83   84   85   85   83   84   80   81   81   81   82   82   83
83   84   86   85   85   83   84   80   79   80   82   82   81   83 ];
d = unique(I);
out = [];
for jj = 1:numel(d)
    r = bwconncomp(I == d(jj),4);
    out = [out;[repmat({d(jj)},r.NumObjects,1) r.PixelIdxList']];
end
or
d = unique(I);
out = [];
for jj = 1:numel(d)
    s=regionprops(bwconncomp(I == d(jj),4),'PixelList');
    out = [out;[repmat({d(jj)},numel(s),1) {s.PixelList}']];
end
[ii,ii] = sortrows(cell2mat(cellfun(@(x)x(1,:),out(:,2),'un',0)),[2 1]);
out = out(ii,:);
Related Question