Adaptive quantizer design for video coding

Improved video encoding and decoding techniques are described, including techniques that adaptively derive quantization step size using a quantization step size table template. The described quantization techniques provide for finer-grained control of quantization with a more flexible quantization step size, particularly at higher quantization levels. This may result in improved overall compression quality. Other coding parameters, such as loop filtering parameters, may be derived based on more flexible quantization parameters. 描述了改进的视频编码和解码技术，包括利用量化步长大小表模板自适应地导出量化步长大小的技术。所描述的量化技术提供了用更灵活的量化步长大小对量化进行更细粒度的控制，尤其是在较高量化程度时。这可得到改善的整体压缩质量。可基于更灵活的量化参数来导出诸如回路滤波参数的其他编码参数。