image block indices

hi all,

i've this following code

function [rc, gc, bc, out, fileList] = histogram(f)
%------ ini adalah program untuk mentimpan histogram----------
%bersihin dulu variabelnya
% clear all;

%set path tempat siimpan database citra, terus baca semua citra di database
f = 'D:/pengenalan pola/tugas image retrieve/image';
fileList = dir(fullfile(f,'*.jpg'));

%Read in RGB image file.
%baca citra dan bagi citra menjadi 4 blok berukuran sama
%cari nilai pixel masing-masing komponen warna (RGB)
%simpan dalam variabel
for i = 1:length(fileList)
   I{i} = imread((fullfile(f,fileList(i).name)));
   out{i} = mat2cell(I{i}, ones(120/60,1)*60, ones(120/60,1)*60, 3);
   [ra{i} rb{i} rc{i}] = cellfun(@(x) unique(x(:,:,1)), out{i} , 'un', 0);
   [ga{i} gb{i} gc{i}] = cellfun(@(x) unique(x(:,:,2)), out{i} , 'un', 0);
   [ba{i} bb{i} bc{i}] = cellfun(@(x) unique(x(:,:,3)), out{i} , 'un', 0);
   for j = 1:4
       rr{i}{j} = rc{i}{j}(ra{i}{j});
   end
end

after i run, it shows error:

??? Subscript indices must either be real positive integers or logicals.

Error in ==> histogram at 21 rr{i}{j} = rc{i}{j}(ra{i}{j});

how can i fix it??

Answer 1

[David Young]

It doesn't make sense to use ra{i}{j} as an index into rc{i}{j}. You can avoid the error message by swapping their roles,

rr{i}{j} = ra{i}{j}(rc{i}{j});

but since this just reconstructs unique(out{i}{j}(:,:,1)) I'm not sure that it helps. Can you explain what the code is intended to do and how it is meant to work?

[Rusmaya Luthfina]

i've already solved my problem,, but thx for ur answer..

i'm running image retrieval histogram color based,, but still haven't got the idea what to do with the histogram

[Image Analyst]

Yes, that's apparent. Why not just use imhist()?