Predicting Chroma from Luma in AV1
This work improves video compression efficiency for users of the AV1 codec, representing an incremental advancement in chroma prediction.
The paper tackles chroma prediction in video coding by introducing the Chroma from Luma (CfL) predictor in AV1, which reduces BD-rate by 5% for still images and 2% for video sequences on average.
Chroma from luma (CfL) prediction is a new and promising chroma-only intra predictor that models chroma pixels as a linear function of the coincident reconstructed luma pixels. In this paper, we present the CfL predictor adopted in Alliance Video 1 (AV1), a royalty-free video codec developed by the Alliance for Open Media (AOM). The proposed CfL distinguishes itself from prior art not only by reducing decoder complexity, but also by producing more accurate predictions. On average, CfL reduces the BD-rate, when measured with CIEDE2000, by 5% for still images and 2% for video sequences.