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How to compress the image ?

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tabw
tabw 2014-8-29
回答： Yawar Rehman 2014-9-3
for example, I have a 3D image in grayscale, 512X512X300.
I just want to compress it in X and Y plane.
I want 4 pixels to combine into one pixel.
And the value of the combined pixel takes average on that 4 pixels or take its max.
Can I directly do on 3D image? If not, please tell me how to do it on 2D image.
Thanks.

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回答（2 个）

Image Analyst
Image Analyst 2014-8-29
Just save it as a .mat file. This is a proprietary binary format that will probably be fairly compressed, and anyway, it will make it convenient to read back in to MATLAB.
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tabw
tabw 2014-9-2
I should state more clearly.
I want to compress the pixel size. maybe say in this way, I want to combine 4 pixels into 1 pixel because my image is too big.

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Yawar Rehman
Yawar Rehman 2014-9-3
image analyst is rigth, i think you have a stack 300 gray scale images whose dimensions are 512x512.
compression usually involves techniques like principal components analysis. but from your question it is more evident that you want to downsample an image by the factor of 1/4 rather than compress. i think this would be useful!
% images you have
imgs = zeros(512,512,300);
% downsample by 1/4
downImages = imresize(imgs,1/4);

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