converting 3D matrix to 2D image
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how to convert 3D matrix C(4x4x64) into 2D W1(32x32) plz help i have divided an image into 4x4 blocks & saved them into matrix C1(a,b,c) now i want to reconvert it into image
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Image Analyst
le 25 Mar 2012
We have no idea how you want these blocks to be arranged. Please read your message from our point of view and try to figure out what you meant. I don't know what a "block" is - is it a cell? A slice out of a 3D image like C? Is C the original matrix, or the one you have after dividing your image into blocks? You could have 8 4x4 blocks in each direction to get 32 pixels along a dimension, or 64 blocks to make up a 32x32 2D image. Am I supposed to know how all those 64 blocks are to be arranged? In what order?
Andrei Bobrov
le 26 Mar 2012
f = @(block_struct)dct2(block_struct.data);
f2 = @(block_struct)idct2(block_struct.data);
C1 = blockproc(HL31,[4 4],f);
C5 = blockproc(C1,[4 4],f2);
OR
ij = {4*ones(size(HL31,1)/4,1),4*ones(size(HL31,2)/4,1)}
C1 = cell2mat(cellfun(@(x)dct2(x),mat2cell(HL31,ij{:}),'un',0))
C5 = cell2mat(cellfun(@(x)idct2(x),mat2cell(C1,ij{:}),'un',0))
OR in your case
s3 = size(C5);
s2 = s3(1:2)*s3(3)/2;
ji = arrayfun(@(x)1:s3(x):s2(x)-s3(x)+1,1:2,'un',0);
[j1,i1] = ndgrid(ji{:});
ii = 0:s3(1)-1;
jj = 0:s3(2)-1;
out = zeros(s2);
for k = 1:numel(j1)
out(i1(k) + ii,j1(k) + jj) = C5(:,:,k);
end
2 commentaires
Sandip
le 8 Août 2013
I guess I have a similar problem. I have an image (tiff). I want histogram of this image/grey scale. However, when I read in the image, I find that my image (tiff) is in 3 D matrix form. How can I convert the image to 2D matrix! imhist command works only for images with 2D matrix form.
Regards,
1 commentaire
Jan
le 8 Août 2013
Please post a new question in a new thread. If you highjack an existing thread, it is not clear, which answer belongs to which question, and you cannot selected an accepted answer.
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