extract matrix from matrix
显示 更早的评论
sir i have image of size 256*256 and i want to extract 5*5 matrix from every 8*8 block of 256*256 image what is code for this...also i want to add zeros to all 5*5 blocks and make 5*5 to 8*8 matrix of the 256*256 image ..what is code for this
1 个评论
the cyclist
2014-4-12
For your second question, how are the 5x5 blocks stored, specifically?
回答（1 个）
the cyclist
2014-4-11
Here is a very straightforward way to do this:
% Put in some pretend data
bigMatrix = rand(256);
% The algorithm
for ni=1:8:256
for nj = 1:8:256
i_idx = (ni-1)/8+1;
j_idx = (nj-1)/8+1;
smallMatrices{i_idx,j_idx} = bigMatrix(ni:ni+7,nj:nj+7);
smallMatrices{i_idx,j_idx}(:,6:8) = 0;
smallMatrices{i_idx,j_idx}(6:8,:) = 0;
end
end
4 个评论
Jitesh Bhanushali
2014-4-11
the cyclist
2014-4-12
If you remove the lines where I set the rows/columns to zero, then it solves your first issue.
Jitesh Bhanushali
2014-4-24
the cyclist
2014-4-25
I can't help you solve the second issue until you respond to the comment I made (just under your question). How are the 5x5 blocks stored?
类别
在 帮助中心 和 File Exchange 中查找有关 Neighborhood and Block Processing 的更多信息
2014-4-11
2014-4-25
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
