Image decoding apparatus and image decoding method

An image decoding and decoding part technology, which is applied in the field of image decoding devices, and can solve the problems such as the number of decoding processing cycles and the increase of the number of decoding processing cycles that can be suppressed without being described.

Inactive Publication Date: 2008-09-17
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in JP-A-2006-135786, there is no description about a technology capable of suppressing an increase in the number of decoding processing cycles.

Method used

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  • Image decoding apparatus and image decoding method
  • Image decoding apparatus and image decoding method
  • Image decoding apparatus and image decoding method

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Experimental program
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no. 1 Embodiment approach

[0045] FIG. 1 shows a block diagram of an image decoding device according to a first embodiment of the present invention.

[0046] The image decoding device 100 shown in FIG. 1 is a hardware configuration for decoding run_before syntax.

[0047] The image decoding device 100 is characterized in that it includes a FIFO device 101 as a bit stream update output unit, which inputs a bit stream (bitstream) constituted by a plurality of syntaxes of variable-length codes, and updates and outputs the bitstream in accordance with the code length thereof. The syntax at the beginning; as the variable length code decoding device 102 of the bit stream decoding part, the variable length code from the syntax of the FIFO device 101 is decoded according to decoding requirements; The specific syntax (such as total_zeros) that has been decoded is used as an initial value to update zerosLeft; the remainder update device 104 of run_before uses the specific syntax (such as TotalCoeff) that has been...

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Abstract

The invention includes: a bitstream updating output unit configured to receive a bitstream and update a syntax element located at a beginning of the bitstream according to a code length thereof and outputs the syntax element; a bitstream decoding unit configured to decode, in response to a decode request, a variable-length code of the syntax element outputted from the bitstream updating output unit; a zerosLeft updating unit configured to update zerosLeft based on a specific syntax element decoded by the bitstream decoding unit; a run_before remaining number updating unit configured to update a run_before remaining number based on a specific syntax element decoded by the bitstream decoding unit; and a syntax selection unit configured to select a syntax element to be decoded by the bitstream decoding unit. Thus, multiple zero run_before syntaxes and one non-zero run_before syntax, or multiple zero run_before syntaxes are decoded all at once.

Description

[0001] Cross-references to related applications [0002] This application is based on and claims priority from prior Japanese Patent Application No. 2007-63827 filed on March 13, 2007, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to an image decoding device and an image decoding method for decoding an image coded bit stream (encoded image data) encoded in the H.264 format. Background technique [0004] In the technology called H.264 / AVC (Advanced video coding (Advanced Video Coding)) recommended by ITU-T (hereinafter simply referred to as H.264), it is stipulated to represent the coded data sequence (bit stream ) rules (syntax) for setting criteria to transmit DCT coefficients, motion vectors, and the like. [0005] For example, in order to compress and encode video data and transmit it, the input data of luminance or color difference and the motion prediction error (residual error block) of each p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30H04N7/50H03M7/40H04N19/00H04N19/13H04N19/134H04N19/189H04N19/423H04N19/44H04N19/93
CPCH04N19/00478H04N19/00533H04N19/00884H04N19/42H04N19/44H04N19/70
Inventor 铃村龙广小川贵也大上晃弘
Owner KK TOSHIBA
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