首页>
外国专利>
Apparatus and method for pipelining variable length decode and inverse quantization operations in a hybrid motion-compensated and transform coded video decoder
Apparatus and method for pipelining variable length decode and inverse quantization operations in a hybrid motion-compensated and transform coded video decoder
展开▼
机译:用于在混合运动补偿和变换编码的视频解码器中流水线化可变长度解码和逆量化操作的设备和方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
A method for pipelining variable length decode and inverse quantization operations in a hybrid motion-compensated and transform coded video decoder includes the step of mapping a new code word to a look-up table to retrieve a code word length, a zero-run length, and a quantized level. A new linear, zig-zagged position of a current coefficient is identified from the zero-run length and a previous zero-run length. The code word length is added to a current bitstream position to yield a new bitstream position. A quantization matrix coefficient from the new linear, zig-zagged position of the current coefficient is selected. The quantized level is multiplied by a predetermined value to produce a quantization product. In the case of inter block processing, a quantized level sign value is added to the quantization product. In the case of intra block processing, the quantization product does not include the quantization level sign. The quantization product is multiplied by a quantization matrix coefficient to form a derived quantization value. The derived quantization value is divided by a predetermined word length to produce a final quantization value. The new linear, zig-zagged position of the current coefficient is converted to a two-dimensional display position. The final quantization value is written at the display position.
展开▼