Nice article!
What surprises me is that the original VLC filter does not use SIMD. Sometimes I wonder why I spent my money on a "modern" CPU with a lot of new features that stay completely ignored by most software I run every day.
What surprises me is that the original VLC filter does not use SIMD. Sometimes I wonder why I spent my money on a "modern" CPU with a lot of new features that stay completely ignored by most software I run every day.
Even on a GPU, you wouldn't use an algorithm this simple in production. For small radii, leveraging bilinear filtering halves the number of samples. For larger radii, hierarchical pyramid approximations are popular.
The hot paths in VLC (decoding via dav1d/FFmpeg, chroma conversion, surface copies, deinterlacing) are hand-tuned SIMD with runtime CPU dispatch, and most playback runs on the GPU anyway.
Not really the question that this study is addressing though.