Shadertoy-Shaders/Image-Filtering/Optimized-Bilateral-Filter
Sven Vogel 739a00f466 fixed links 2024-03-02 14:34:46 +01:00
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README.md fixed links 2024-03-02 14:34:46 +01:00
overview.png added files 2023-06-30 13:56:07 +02:00

README.md

Optimized-Bilateral-Filter

overview.png

In part 1 you can the example image with noise applied to it. In sector 2 you can see the denoised image and in sector 3 is the original unfiltered image.

A biliteral filter is essentially a gaussian blur filter with an extra weight applied per pixel. This weight is a the luminance range between the target pixel to filter and the sourounding pixels passed into a gaussian weight function.

Optimization

Instead of applying a very costly gaussian blur filter we can optimize it by using a tent blur filter instead. This allows to speed up the performance by replacing the gaussian weight function with a tent blur kernel. Additionally we can optimize the squareroot of the gaussian weight function for the luminance range away.