is there a way so that we extract a particular block from an 8x8 image?

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Raman
Raman 2013-3-10
i've an image of size 8x8 blocks i.e total of 64 blocks.
i want to extract or show only few blocks...
how can i do so?
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);
% Extract out the block into a single subimage.
oneBlock = grayImage(row1:row2, col1:col2);
% Specify the location for display of the image.
subplot(6,8, blockNumber);
imshow(oneBlock);
end
end
the above code shows all the 64 blocks..
what should i do, so that only block 10 and block 34 is show rather than all the blocks..
if there is a way tell me how to do it..
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Raman
Raman 2013-3-11
编辑：Raman 2013-3-11
how can can i do so? can u help me sir by writing few lines of code plz..
reply plz

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Walter Roberson
Walter Roberson 2013-3-12
编辑：Walter Roberson 2013-3-12
blockrows =8; blockcols = 8;
[blockcol, blockcol] = ind2sub( [blockcols, blockrows], BlockNumber]
colstart = (blockcol-1) * blockSizeC + 1;
rowstart = (blockrow - 1) * blockSizeR + 1;
oneBlock = grayImage(rowstart : rowstart + blockSizeR - 1, colstart : colstart + blockSizeC - 1);
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Walter Roberson
Walter Roberson 2013-3-12
Sorry, should have been ind2sub() rather than idx2subs()
Do not enclose this in a "for" loop. The above is the complete code to extract by block number. For example to extract block #34, use those lines of code with BlockNumber = 34

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