pls help me to solve this question

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TUSHAR MURATKAR 2017-7-28

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评论： Guillaume 2017-8-1

i am working on a project in which i need to divide an image of size M*N into overlapping blocks of size B*B. i tried in number of ways but i am getting some error......pls help me

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TUSHAR MURATKAR 2017-7-28

编辑：Geoff Hayes 2017-7-28

在 MATLAB Online 中打开

Here is my code.

grayImage = A1;
% 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', 16);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% 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 = 128; % Rows in block.
blockSizeC = 128; % Columns in block.
% Figure out the size of each block. 
wholeBlockRows = floor(rows / blockSizeR);
wholeBlockCols = floor(columns / blockSizeC);
% Preallocate a 3D image
image3d = zeros(wholeBlockRows, wholeBlockCols, 3);
% Now scan though, getting each block and putting it as a slice of a 3D array.
sliceNumber = 1;
for row = 1 : blockSizeR : rows
  for col = 1 : blockSizeC : columns
    % Let's be a little explicit here in our variables
    % to make it easier to see what's going on.
    row1 = row;
    row2 = row1 + blockSizeR - 1;
    col1 = col;
    col2 = col1 + blockSizeC - 1;
    % Extract out the block into a single subimage.
    oneBlock = grayImage(row1:row2, col1:col2);
    % Specify the location for display of the image.
    subplot(2, 2, 1);
    imshow(oneBlock);
    % Make the caption the block number.
    caption = sprintf('Block #%d of 4', 2);
    title(caption, 'FontSize', 16);
    drawnow;
    % Assign this slice to the image we just extracted.
    image3D(:, :, 3) = oneBlock;
    sliceNumber = sliceNumber + 1;
  end
end

TUSHAR MURATKAR 2017-8-1

@ image analyst i want to divide an image into overlapping blocks. i dont want readymade code. can u explain me what is the exact difference between overlapping blocks and non overlapping blocks using example.

please explain your answer for this question: to divide 640*480 image into overlapping blocks of size 20*20.

Guillaume 2017-8-1

@Tushar Muratkar,

It should be you who explain what you mean by divide an image into overlapping blocks (and what you intend to do with that division). We have no idea.

Note that if you want to apply a function to a sliding window over the image, you can use nlfilter

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