change matrix from 3D TO 2D
2 views (last 30 days)
Show older comments
i have 3d matrix (512x512x3) i want transform to 2d matrix (512x512)
1 Comment
Answers (2)
Thomas
on 6 Dec 2012
Edited: Thomas
on 6 Dec 2012
Your matrix has 512*512*3=786432 elements.. to reshape you need to keep the number of elements the same.. That means you cannot reshape if you want just 512*512 elements without losing elements or data..
However if you want to access only the first dimension of your matrix (a) you use some thing like a(:,:,1)
If your data is an image data and it has the three dimension r,g,b you can covert it to grayscale (using im2bw)which should give you a matrix of 512*512
Example for my color image 1.jpg
ii=imread('1.jpg');
size(ii)
ans =
551.00 1024.00 3.00
out=im2bw(ii); % convert to blackwhite
size(out)
ans =
551.00 1024.00
0 Comments
Wayne King
on 6 Dec 2012
Edited: Wayne King
on 6 Dec 2012
You have to select one "page" of the 3D matrix, which one do you want?
X = randn(512,512,3);
Y = X(:,:,1);
Or you can form some function of the 3 pages, not sure what you want. For example:
X = randn(512,512,3);
Y = mean(X,3);
0 Comments
See Also
Categories
Find more on Resizing and Reshaping Matrices in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!