An Optimization Algorithm for Color Table Generation of Palette Mode for VVC

Palette mode is one of core screen content coding (SCC) tools in Versatile Video Coding (VVC) Standard. Nevertheless, the existing oversimplified and unitary color table generation (initiation) method of palette mode is hard to effectively deal with the increasingly complex screen content. Aiming at this problem, we propose a color table generation algorithm, an encoder only optimization algorithm that is effective to suppress color cluster centers drifting and enhance the convergence of color clustering by introducing another distinct reference color table. Experimental results show that with this method added, the encoder can achieve a certain BD-rate saving in test conditions compared to VTM 10.0 with a marginal coding time increase.