Grouping the pixel having same values

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

[Image Analyst]

Define grouped. The bwconncomp or bwlabel function will do connected components labeling, but then what are you going to do with, say, 256 images of the groups?

Answer 1

[Andrei Bobrov]

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,:);

[kash]

wen displaying as imshow(out) i get error

Error using iptcheckinput Function IMAGEDISPLAYVALIDATEPARAMS expected its first input, I, to be one of these types:

    double, single, uint8, uint16, uint32, int8, int16, int32, logical

Instead its type was cell.

[Walter Roberson]

Please show class(out) and size(out) when the error occurs.

[kash]

    class(out) is cell

    and size(out) 49  2