Low Complexity Integer Transform and Adaptive Quantization Optimization

In this paper, a new low complexity integer transform is proposed, whichhas been adopted by AVS1-P7. The proposed transform can enable AVS1-P7to share the same quantization/dequantization table with AVS1-P2. As thebases of the proposed transform coefficients are very close, thetransform normalization can be implemented only on the encoder side andthe dequantization table size can be reduced compared with the transformused in H.264/MPEG-4 AVC. Along with the feature of the proposedtransform, adaptive dead-zone quantization optimization for the proposedtransform is studied. Experimental results show that the proposedinteger transform has similar coding performance compared with thetransform used in H.264/MPEG-4 AVC, and would gain near 0.1dB with theadaptive dead-zone quantization optimization.