P‐9.2: High efficiency compression techniques of RGBA images for X‐Reality

High‐resolution RGBA format images are widely used in X‐Reality for rendering, which makes RGBA image compression an indispensable part of data transmission process. As current majority of commonly used compression standards not supporting RGBA format and simple RGBA to RGB format conversion introduces irreversible Alpha channel information loss, we propose an image compression method. By extracting alpha channel information and concatenating it with the RGB part, combined with any general compression algorithm, the method showed effective RGBA image compression ability in experiment with lightly Alpha channel information loss.