fast gaussian blur on windows CE

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Does anyone know of a library (managed or native) that can perform a gaussian blur of a windows CE screenshot (low res) in 1 or 2 seconds?

I found a PC one in C# and it took around 10 seconds.

My objective is to blur out the screen and paint an in focus popup box in the middle of the screen, I have the necessary tools for the alpha blending and so forth, but finding any sort of image manipulation library is proving to be a challenge.

Posted 18-Oct-10 18:37pm

Simeon Higgs

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Peter_in_2780 · Answer 1 · 2010-10-19T18:12:00

The trick to speeding up gaussian blur is to take advantage of its separability. That is, you can do one pass in the x direction (along each single row) and one pass in the y direction (down each column). Much faster than using a square kernel. Look up wikipedia for "gaussian blur"; the first external link even includes some code. For your application, you can affort to truncate the kernel pretty aggressively too. (I'm guessing 7x7 or even 5x5 will give you an acceptable result.)
[edit] You can probably get even more speedup using scaled integer arithmetic rather than float. Remember that you don't need NASA's gold-plated hammer to whack a nail into a plank! A lump of rock can do that job.[/edit]

Peter

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