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    • 1. 发明授权
    • Entropy encoder, video coding apparatus, video coding method and video coding program
    • 熵编码器,视频编码装置,视频编码方法和视频编码程序
    • US08351500B2
    • 2013-01-08
    • US12354647
    • 2009-01-15
    • Kensuke Shimofure
    • Kensuke Shimofure
    • H04N7/12
    • H03M7/4006H04N19/196H04N19/463H04N19/91
    • An entropy encoder, a video coding apparatus, a video coding method and a video coding program can cope with the adverse effects that arise as a result of a local increase of overhead code quantity. The quantization parameter output form the code quantity control unit of a video coding apparatus is input to a third arithmetic unit before being input to the context initializer in an entropy encoder and a quantization parameter offset value is subtracted from it there. The discrepancy relating the generation probability of a symbol where significant coefficients exist can be improved by initializing an arithmetic coding context by using the quantization parameter obtained by subtracting a predetermined value form the quantization parameter defined by a rate control unit.
    • 熵编码器,视频编码装置,视频编码方法和视频编码程序可以应付由于开销代码量的本地增加而产生的不利影响。 在熵编码器中输入到上下文初始化器之前,从图像编码装置的代码量控制单元输出的量化参数输入到第三运算单元,并从中减去量化参数偏移值。 可以通过使用通过从由速率控制单元定义的量化参数减去预定值而获得的量化参数来初始化算术编码上下文来改善与存在有效系数的符号的生成概率相关的差异。