i've an image of size 185x256 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...

1 次查看（过去 30 天）
pammy
pammy 2013-4-10
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 185x256 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 185x256..i dont want to use the function imresize...

请先登录，再回答此问题。

采纳的回答

Ahmed A. Selman
Ahmed A. Selman 2013-4-10
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.
  10 个评论
显示 8更早的评论
Ahmed A. Selman
Ahmed A. Selman 2013-4-11
Sure Pammy, it is your code and I only tried to slightly modify it for you. Please do not hesitate if you needed further modifications. Regards.
Ahmed A. Selman
Ahmed A. Selman 2013-4-11
But you used a smart technique in the original code, why not extending it if you want to change the block numbers?
Anyway, I've modified it a little bit further as below (works for any blockSizeR and blockSizeC) as:
... % the above lines are the same.
disp(glcm);
if (blockNumber>blockSizeC*blockSizeR);return;end
subplot(blockSizeC,blockSizeR,blockNumber);
imshow(oneBlock);
... % the rest of the code is the same.
notice the new (if) statement. I've tried the new modifications at
blockSizeR=10 and blockSizeC=16;
blockSizeR=20 and blockSizeC=20;
blockSizeR=11 and blockSizeC=11;
and all worked fine.

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson
Walter Roberson 2013-4-10
Your code does not define "rows" or "columns"
  6 个评论
显示 4更早的评论
pammy
pammy 2013-4-11
sir subplot(16,16,blockNumber) when i m resizing my image and
subplot(11,16,blockNumber) when i m not resizing it...
@Ahmed A. Selman gave me a solution...his solution works well only when each row has 16 columns but what if each rows has less than 16 columns
that is;
as my grayImage is 185x256 then it has wholeBlockRows 12 and wholeBlockCols 16, the solution given to me works well for this but when the image size 185x190 then it does not work
tell me the solution of it sir....

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Data Distribution Plots 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by