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Structure and method of fully parallel frequency generation circuit for static Huffman table generation

A technology for generating circuits and frequency numbers, which is applied in the field of fully parallel frequency number generation circuit structures, can solve problems such as increasing image processing time and reducing image encoding efficiency, and achieves the effect of reducing generation time and improving image encoding efficiency

Active Publication Date: 2021-04-09
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, this method needs to scan the picture once before the picture is encoded, which increases the picture processing time and reduces the picture coding efficiency

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  • Structure and method of fully parallel frequency generation circuit for static Huffman table generation
  • Structure and method of fully parallel frequency generation circuit for static Huffman table generation

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The fully parallel frequency generation circuit structure has a total of 257 (0~256) Cell sub-modules. The function of the Cell sub-module: the Cell sub-module will determine whether the symbols and frequencies stored by itself are changed according to the input control signal, that is, it mainly realizes the update. Function. Each sub-module stores the symbol value SYMBOL and the frequency value FREQ corresponding to the symbol value. The range of input characters is 0-255, and the function of the Cell_256 module is to provide the negated code point, so it is not shown in the figure. The SORT signal comes from the outside and is the enable signal for the sorting module to work. If the SORT signal is 1, it means sorting is required, otherwise the values ​​of all sub-modules remain unchanged.

[0019] The input data and output can be ...

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Abstract

The invention discloses a fully parallel frequency generation circuit structure and method for static Huffman table generation, including 257 Cell sub-modules and a signal generation module; each Cell sub-module stores a symbolic value SYMBOL and the corresponding symbol value Frequency value FREQ; each Cell sub-module receives the signal Input_symbol, and the output signals Freq_out and Symbol_Out of the current sub-module are connected to the next-level sub-module, which are respectively used as the input control signals Freq_Right and Symbol_Right of the next-level sub-module; the next-level sub-module According to the input control signal, it determines whether the symbol value SYMBOL and the frequency value FREQ stored by itself change, so as to realize the updating function. The circuit structure and method proposed by the invention can effectively reduce the time for generating the Huffman table and improve the picture coding efficiency.

Description

technical field [0001] The invention relates to the technical field of digital image coding chip design, in particular to a fully parallel frequency generation circuit structure and method for static Huffman table generation. Background technique [0002] Huffman coding is a kind of variable-length coding, which was proposed by Huffman in 1952. Its basic realization principle is to scan the image data once, and then perform operations such as DCT, quantization, Zigzag sorting, DC / AC coefficient intermediate symbol conversion, etc. , and then count the probability of occurrence of various symbols in it, and generate unique codewords of different lengths corresponding to each character according to the frequency of occurrence of the probability, thereby obtaining a Huffman code table of an image. Finally, the characters converted by the intermediate symbols are replaced with the corresponding codewords. Since the characters with high frequency appearing in the Huffman code ta...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/91H04N19/42H03M7/40
CPCH03M7/40H04N19/42H04N19/91
Inventor 邸志雄叶帅林思成冯全源
Owner SOUTHWEST JIAOTONG UNIV
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