MATLAB: I’ve an image of size 185×256 and i’ve divided the image into discrete blocks having block rows 16 and block columns 16. when i access the blocks in a loop it says index exceeds matrix dimension…

Question

the code is as follows:

in the following image it has 11 rows and 16 columns grayImage http://imageshack.us/photo/my-images/17/tanklb.jpg/

 grayImage=rgb2gray(Imread('tank.jpg'));
 whos grayImage
 [rows columns numberOfBands]=size(grayImage);
 blockSizeR = 16;% Rows in block.
 blockSizeC = 16; % Columns in block.
 wholeBlockRows = floor(rows / blockSizeR);
 wholeBlockCols = floor(columns / blockSizeC);
 fprintf('\nSize of whole block is %d %d\n\n',wholeBlockRows,wholeBlockCols); 
 blockNumber=1;
 for row = 1 : blockSizeR : rows
  for col = 1 : blockSizeC : columns
    row1 = row;
    row2 = row1 + blockSizeR - 1;
    row2 = min(rows, row2); 
               % Determine starting and ending columns.
    col1 = col;
    col2 = col1 + blockSizeC - 1;
    col2 = min(columns, col2); % Don't let it go outside the image.
    % Extract out the block into a single subimage.
    oneBlock = grayImage(row1:row2, col1:col2);
                glcm=graycomatrix(oneBlock,'NumLevels',16);
                disp(glcm);
                subplot(16,16,blockNumber);
                imshow(oneBlock);
        caption2 = sprintf('Block #%d\n of %d', blockNumber,256);
    title(caption2, 'FontSize', fontSize);
    %drawnow;
        blockNumber = blockNumber + 1;
    end
  end

i has total of 11 rows and 16 columns i.e 185×256 when i calculate the GLCM

i got the error as

         Index exceeds number of subplots.

can u tell me how to solve this error…

which line of code should i add to the above code so that it can work well…

i've to only deal with the size 185×256..i dont want to use the function imresize…

Answer 1

Just add

   clear

at the very top of the code. Also these issues:

Line 26: change (oneBlocl)  to   (oneBlock)
Line 30: define the variable (blocks)
Line 31: define (fontSize) in the title argument

perhaps you want to add the command

clc

inside the loops to clean the screen while running (makes run a little bit faster)

After I've made the above minor fixes, it worked fine.