MATLAB: Resize 4D image (RGB + another channel)

imresize

I cant use imresize to resize an image with 4 channels. How do i do this ? Do i need to resize each channel individually ? Help thanks.

Best Answer

It depends on what that extra channel represents (and on the resizing method that you want to use). Assuming that extra channel is completely independent from the RGB data, then you can just use two imresize|

resizedimage = imresize(origimage(:, :, 1:3), ...)
resizedimage(:, :, 4) = imresize(origimage(:, :, 4), ...)

If you use imresize with any method other than nearest neighbour interpolation, then matlab also performs antialiasing which may blend some colours.

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MATLAB: I cant display the image

RGB images use 3 channels. You image has 8 channels. Therefor you have to consider how to reduce the channel size.

img = randi([0, intmax('uint16')], 832, 2016, 8, 'uint16');  % Test data
rgb = im2double(img(:, :, 1:3));  % For example
imshow(rgb)

Or perhaps:

img = double(img);
rgb = cat(3, sum(img(:, :, [1,2,3]), 3), ...
             sum(img(:, :, [4,5,6]), 3), ...
             sum(img(:, :, [7, 8]),  3));
rgb = rgb / max(rgb(:));

MATLAB: What should i do to make both images of same size

im = imread('kssk.jpg');
newIm = rgb2gray(imresize(im, [256, 256]));

Best Answer

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MATLAB: I cant display the image

MATLAB: What should i do to make both images of same size

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