JCTVC-B044 [T. Chujoh, T. Shiodera, T. Yamakage (Toshiba)] TE2: Adaptive scaling for bit depth compression on IBDI
In this contribution, detailed results of an adaptive scaling for bit depth compression on IBDI are reported. This is one of proposals in Tool Experiment 2 on IBDI and memory compression. The purposes of this tool experiment are to improve coding efficiency by increasing internal process of video codec while minimizing reference frame memory access bandwidth and to reduce reference frame memory access bandwidth and reference frame memory size. This contribution shows a solution of the first purpose and as experimental results, the loss bitrate is average of 0.13% for bit depth compression on IBDI.
Memory compression applied with IBDI on and off; loss compared to IBDI (12 bit mapped to 8 bit) is 0.13% in terms of bit rate. Adaptation to the dynamic range of each 4x4 block (offset + scale values are encoded additionally). Gives better result than fixed scaling. Requires computation of histogram as first step.
Coding: 1 bit signaling fixed (8 per sample) or adaptive scaling
(2 bits for scale, 8 bits for offset, 7 bits per sample = 122 instead 128)
A participant remarked that switching fixed/adaptive could cause problems in random access as necessary for MC.
It was suggested to investigate complexity compared to other methods.
Dostları ilə paylaş: | 
