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GLSL Chroma from Luma (CfL) Prediction

Overview

The shaders implement chroma upscaling based on the closed least squares solution for linear regression, inspired by the adoption of the same technique in modern video codecs.

Since a simple linear regression obviously doesn't take into account pixel distance, the prediction is mixed with the output of a normal resampling filter based on how high the correlation between luma and chroma is. Additionally, it's also smoothed with a bilateral filter.

You can control which local linear regressions you want to use with USE_12_TAP_REGRESSION and USE_8_TAP_REGRESSIONS. You can also configure the smoothing step with the distance_coeff and intensity_coeff inputs.

The lite variant offers slightly better performance at the expense of some quality.

Instructions

Add something like this to your mpv config:

vo=gpu-next
glsl-shader="path/to/shader/CfL_Prediction.glsl"