Combining image after diving it into blocks

Question

Ayesha 2014-5-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/129664-combining-image-after-diving-it-into-blocks

评论： shital shinde 2020-2-14

Hello,

I applied dwt on 500x500 image and split LL which is 254x254 into 16x16 block. Here's the code snippet which explains how I split the image:

imshow(block,[]); % LL block obtained after applying dwt over 500x500 image
newR=16; 
newC=16; 
r1=[newR*ones(1,wholeBlockRows),rem(rows,newR)];
c1=[newC*ones(1,wholeBlockCols),rem(columns,newC)];
i = 1;
for r=1:size(mat2cell(block,r1,c1);,1)
    for c=1:size(mat2cell(block,r1,c1);,2)
        split=ca{r,c}; 
        i=i+1;
    end
end

Two questions: 1. How could I recombine the 16x16 blocks together to form 254x254 image after this? 2. Excuse my arrogance but is applying idwt2 to the recombined 254x254 image enough to get the 500x500 image back?