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Does doing a Gaussian blur on a 240*240 pixels image with radius of X will produce the same "blur" than doing a Gaussian blur on a 100*100 pixels image with the same radius ? what exactly is doing the radius in Gaussian blur algorithm ?

often people say me it's better (more faster) to choose a lower radius on a reduced size of an image and magnify the image after. Is this true ? why ?

zeus
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see as an example https://dsp.stackexchange.com/questions/10057/gaussian-blur-standard-deviation-radius-and-kernel-size and http://chemaguerra.com/gaussian-filter-radius/ Hope this helps.

Walter Kuhn
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  • thanks Walter. often people say me it's better (more faster) to choose a lower radius on a reduced size of an image and magnify the image after. Is this true ? why ? – zeus Feb 06 '18 at 10:58
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    Have a look at these algorithms here and check where in the loops the radius is used - you will find out that there is direct influence. http://blog.ivank.net/fastest-gaussian-blur.html – Walter Kuhn Feb 06 '18 at 11:53