how to divide a grayscale image into 8*8 blocks and return it from my function?

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chaitanya g p
chaitanya g p 2016-3-30
评论： Walter Roberson 2016-4-5
i do have a code, but it doesn't work quickly for 8*8. works perfectly for 32 and higher block sizes. it doesn't return the blocks either.
function y=segment1(f)
rgbImage = f;
imshow(rgbImage);
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
drawnow;
[rows columns numberOfColorBands] = size(rgbImage);
blockSizeR =8;
blockSizeC =8;
wholeBlockRows = floor(rows / blockSizeR);
blockVectorR = [blockSizeR * ones(1, wholeBlockRows), rem(rows, blockSizeR)];
wholeBlockCols = floor(columns / blockSizeC);
blockVectorC = [blockSizeC * ones(1, wholeBlockCols), rem(columns, blockSizeC)];
if numberOfColorBands > 1
ca = mat2cell(rgbImage, blockVectorR, blockVectorC, numberOfColorBands);
else
ca = mat2cell(rgbImage, blockVectorR, blockVectorC);
end
plotIndex = 1;
numPlotsR = size(ca, 1);
numPlotsC = size(ca, 2);
for r = 1 : numPlotsR
for c = 1 : numPlotsC
fprintf('plotindex = %d, c=%d, r=%d\n', plotIndex, c, r);
subplot(numPlotsR, numPlotsC, plotIndex);
rgbBlock=ca{r,c};
imshow(rgbBlock);
[rowsB columnsB numberOfColorBandsB] = size(rgbBlock);
caption = sprintf('Block #%d of %d\n%d rows by %d columns', plotIndex, numPlotsR*numPlotsC, rowsB, columnsB);
drawnow;
plotIndex = plotIndex + 1;
end
end
end

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采纳的回答

Walter Roberson
Walter Roberson 2016-3-30
Your code starts
function y=segment1(f)
so it will return whatever is stored in the variable "y" by the function. But you do not store anything into y, so it cannot return the blocks. You need to store the blocks in y.
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Walter Roberson
Walter Roberson 2016-4-5
What is your defined output type? What kind of variable do you need to return? What is it that needs to be returned?

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