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Context odeling, robability stimation and ssignment
CABAC的model有两种一个是普通一个是bypass。
上下文模型:选择概率模型
probability estimation:The parameters of probability models in CABAC are adaptive
每一个概率模型用7bit来存储,其中6bit来存储63个概率状态LPS,1bit涌过来存储最MPS。
状态转换。
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Multiplication-Free inary rithmetic Coding:The Coder
随着输入的LPS,MPS的二进制bit,不停的改变着区间段;由于寄存器的精度有限,必须进行规范化。
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Regular Coding Mode
the approximation of the multiplication on the right-hand side of Eq. (8.3) by means
of a table of K pre-calculated product values Wk x n j
<KI
n<Ngin a suitable chosen integer precision。lookup table TabRangeLPS
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Bypass Coding Mode
旁路编码也叫等概率编码,它不使用上下文概率模型,二进制符号0和1的概率都是1/2
参考如下博文:
https://blog.youkuaiyun.com/novice_growth/article/details/70830835
http://blog.sina.com.cn/s/blog_520811730101o72c.html
https://blog.youkuaiyun.com/NB_vol_1/article/details/71374859