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JCT-VC HEVC HM 16 includes a Coding Unit (CU) level adaptive QuantizationParameter (QP) technique named AdaptiveQP. It is designed to perceptuallyadjust the QP in Y, Cb and Cr Coding Blocks (CBs) based only on the variance ofsamples in a luma CB. In this paper, we propose an adaptive quantisationtechnique that consists of two contributions. The first contribution relates toaccounting for the variance of chroma samples, in addition to luma samples, ina CU. The second contribution relates to accounting for CU temporal informationas well as CU spatial information. Moreover, we integrate into our method alambda refined QP technique to reduce complexity associated multiple QPoptimizations in the Rate Distortion Optimization process. We evaluate theproposed technique on 4:4:4, 4:2:2, 4:2:0 and 4:0:0 YCbCr test sequences, forwhich we quantify the results using the Bjontegaard Delta Rate (BD-Rate)metric. Our method achieves a maximum BD-Rate reduction of 23.1% (Y), 26.7%(Cr) and 25.2% (Cb). Furthermore, a maximum encoding time reduction of 4.4% isachieved.

Spatiotemporal Adaptive Quantization for Video Compression Applications