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How to Downsample image in both Horizontal and Vertical Direction

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Any one help me how to downsample image in horizontal direction and vertical direction.
i used downsample(image,4), it will down sample image in both the direction, but i need to downsample separately for horizontal and vertical.
Does any know suggest me please.
Thank You

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Accepted Answer

Sean de Wolski
Sean de Wolski on 7 Dec 2012
Edited: Sean de Wolski on 7 Dec 2012
For grayscale:
Xdown = X(1:2:end,1:2:end);
If it's RGB, keep the third dimension:
Xdown = X(1:2:end,1:2:end,:);

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Image Analyst
Image Analyst on 7 Dec 2012
That's how I'd do it for simple subsampling by an integer (2, 3, 4, etc.). There is also the imresize() function that you can use. It will handle interpolation if the subsampling is not by integer amounts.

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