Variable-length code using multiple mapping table and decoding method and apparatus

An encoding method and technology for encoding equipment, which are applied in the field of variable-length encoding methods, variable-length decoding methods and equipment thereof, and can solve the problems of reducing the encoding type of other types of symbols and sacrificing the beneficial effects of UVLC.

Inactive Publication Date: 2009-05-27
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above-mentioned traditional method, although the complexity of implementation is reduced by using the codeword table in general, the UVLC table is used to uniformly map the code number and the symbol to each other, such as Figure 4 , regardless of the probability distribution of the designed symbols, therefore, conventional methods have serious problems in achieving the fundamental goal of maximal compression
That is, the UVLC tables described above may be suitable for certain types of symbols, but may cause a reduction in the encoding type of other types of symbols
To solve this problem, tables optimized for each symbol can be prepared in order to improve efficiency, but in this case, the above-mentioned beneficial effect of UVLC is sacrificed

Method used

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  • Variable-length code using multiple mapping table and decoding method and apparatus
  • Variable-length code using multiple mapping table and decoding method and apparatus
  • Variable-length code using multiple mapping table and decoding method and apparatus

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Embodiment Construction

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following examples, and various modifications can be made without departing from the spirit and scope of the present invention. The embodiments of the present invention are provided in order to more fully explain the present invention to those skilled in the art.

[0039] Figure 5 A block diagram showing the structure of the encoding device of the present invention. The encoding device is constructed using an encoding unit 50 , a mapper unit 60 , and a codeword generating unit 70 . The operation of the encoding device of the present invention will be explained below.

[0040] First, will describe Figure 5 Operation of mapper-based variable-length coding devices. Symbol data to be encoded and element type information as type information on symbols are input to the encoding unit 50 of the present invention. At th...

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Abstract

A symbol is coded by being converted into a first code. The code is then mapped to a second code in dependence on the nature of the information represented by the symbol. In this way, the efficiency of the coding is increased. The coded symbol is decoded by means of a reciprocal mapping process.

Description

technical field [0001] The present invention relates to a variable length encoding method, a variable length decoding method and its equipment, and more particularly to such a variable length encoding method, a variable length decoding method and its equipment, in which multiple mapping tables are used to enable Maintain a common variable-length code table, and prevent compression coding efficiency from decreasing. Background technique [0002] Currently, the International Telecommunications Union's Telecommunication Standardization Sector (ITU-T) has been working on the H.26L international standard related to next-generation video telephony. Although a series of moving image coding methods such as H.261, H.263, H.263+, and later H.263++ and MPEG-4 have been determined as ITU-T international standards, these international standards cannot meet emerging needs. Therefore, in order to cope with new demands, H.26L was proposed. The new requirements are as follows. [0003] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/42H03M7/40H04N19/00H04N19/13H04N19/134H04N19/136H04N19/157H04N19/189H04N19/91
CPCH04N19/00212H03M7/4031H04N19/00181H03M7/4093H04N7/26106H04N19/00812H04N19/00121H04N7/5013H04N19/13H04N19/149H04N19/157H04N19/625H03M7/40H04N19/91
Inventor 全炳宇刘国烈
Owner SAMSUNG ELECTRONICS CO LTD
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