Encoding device and encoding method

Abstract

An encoding device (100) comprises a quantization parameter generating circuit (111), a quantization circuit (121), a binarization circuit (131), an arithmetic encoding circuit (141), a quantization parameter calculation circuit (112), and a quantization circuit (122). The quantization parameter generating circuit (111) generates a temporal quantization parameter. The quantization circuit (121) quantizes a signal to be quantized according to the temporal quantization parameter and generates quantized data. The binarization circuit (131) binarizes the quantized data and outputs binary symbol data. The arithmetic encoding circuit (141) performs arithmetic encoding on the binary symbol data and generates encoded data. The quantization parameter calculation circuit (112) generates a suitable quantization parameter according to the symbol amount of the binary symbol data, the code amount of the encoded data, an upper limit of the symbol amount, and a target code amount. The quantization circuit (122) quantizes the signal to be quantized according to the suitable quantization parameter.

Description

technical field [0001] The present invention relates to a coding device and method, in particular to a coding device and method using arithmetic coding. Background technique [0002] Arithmetic coding is a technology that can reversibly compress the amount of information to the theoretical limit according to the occurrence probability of the information source symbol. In the field of image coding, arithmetic coding is adopted in the JPEG2000 standard (ISO / IEC15444), the H.264 / MPEG4-AVC standard (see Non-Patent Document 1), and the like. [0003] For example, in H.264, Context Adaptive Binary Coding (CABAC: Context Adaptive Binary Coding) is adopted to realize high-efficiency coding corresponding to the probability characteristic of syntax. [0004] Next, context-adaptive arithmetic coding in H.264 will be described. FIG. 9 shows a prior art context adaptive arithmetic coding circuit. [0005] In the context-adaptive arithmetic coding circuit 14 shown in FIG. 9 , the binar...

AI Technical Summary

Problems solved by technology

[0014] When recoding, as mentioned above, it is necessary to restore the occurrence probability information of the arithmetic coding that has been updated, and a complicated circuit structure is required in a coding device that requires real-time processing.

In addition, when multiple coding parameters are applied in parallel for coding, the number of arithmetic coding circuits needs to be the same as the number of coding parameters, resulting in an increase in circuit size

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