i've divided the image into non-overlapping blocks i.e 16 x 16. i'want to convert these blocks to array using mat2cell... can u tell me hoe to do so?

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angel
angel 2013-3-28
i've read the tutorial of mat2cell but unable to generalize it for 16x16 blocks.
the code is:
grayImage=imread('inpImage');
grayImage=rgb2gray(grayImage);
% Get the dimensions of the image. numberOfColorBands should be = 1.
[rows columns numberOfColorBands] = size(grayImage);
% Display the original gray scale image.
figure;
subplot(2, 2, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);
% Divide the image up into 4 blocks.
% Let's assume we know the block size and that all blocks will be the same size.
blockSizeR = 16;% Rows in block.
blockSizeC = 16; % Columns in block.
% Figure out the size of each block.
wholeBlockRows = floor(rows / blockSizeR);
wholeBlockCols = floor(columns / blockSizeC);
fprintf('\nSize of whole block is %d x %d\n\n',wholeBlockRows,wholeBlockCols);
% Now scan though, getting each block and putting it as a slice of a 3D array.
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);
subplot(12,16,blockNumber);
imshow(oneBlock);
caption2 = sprintf('Block #%d\n of %d', blockNumber,blocks);
title(caption2, 'FontSize', fontSize);
drawnow;
blockNumber = blockNumber + 1;
end
end
'oneBlock' represents the intensity matrix of the block...i want to apply the 'mat2cell' function..can u tell me how to do so?
  1 个评论
Image Analyst
Image Analyst 2013-3-28
Why do you want to do that? Seems to me it would just complicate the matter. Using cell arrays is almost always more complicated. Why do you want all these blocks stored in a cell array? Any reason for storing the blocks instead of just using them and moving on to the next block? What are you wanting to do with each block, besides display it?

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采纳的回答

Walter Roberson
Walter Roberson 2013-3-28
mat2cell(grayImage, [repmat(wholeBlockRows, 1, 15), rows-15*wholeBlockRows], [repmat(wholeBlockCols, 1, 15), cols-15*wholeBlockCols], numberOfColorBands)

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