idecimate

an image

s = idecimate(im, m) is a decimated version of the image im whose size is reduced by m (an integer) in both dimensions. The image is smoothed with a Gaussian kernel with standard deviation m/2 then subsampled.

s = idecimate(im, m, sd) as above but the standard deviation of the smoothing kernel is set to sd.

s = idecimate(im, m, []) as above but no smoothing is applied prior to decimation.

Notes

• If the image has multiple planes, each plane is decimated.
• Smoothing is used to eliminate aliasing artifacts and the standard deviation should be chosen as a function of the maximum spatial frequency in the image.

See also

iscale, ismooth, ireplicate

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