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Moving picture decoding method

A technology of moving images and decoding methods, which is applied in image coding, image communication, image data processing, etc., and can solve problems such as low coding efficiency

Inactive Publication Date: 2009-07-15
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0067] The present invention is made to solve the above-mentioned problems, and the object is to provide a moving picture coding method that can avoid the low coding efficiency caused by the long time distance between the target picture and the reference picture, and corresponding to such avoidance. Video decoding method of video coding method with low coding efficiency

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Embodiment Construction

[0204] Next, embodiments of the present invention will be described.

[0205] (implementation form 1)

[0206] figure 1 It is a block diagram for explaining the video coding apparatus according to Embodiment 1 of the present invention.

[0207] The video encoding device 10 according to Embodiment 1 divides a plurality of screens constituting a video into fixed data processing units (blocks), and encodes image data of each screen for each block.

[0208] That is, the video encoding device 10 has an input picture memory (hereinafter also referred to as a frame memory) 101 that stores image data (input data) Id of an input picture and outputs the stored data Id for each block. The difference calculation unit 102 that calculates the difference data between the image data Md of the target block to be coded and the prediction data Pd of the target block output from the frame memory 101 as the prediction error data PEd of the target block, and the above-mentioned A prediction err...

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Abstract

A moving image coding apparatus (10) for performing inter-picture predictive coding on pictures constituting a moving image is provided with a coding unit (103) for performing predictive error coding on image data; a decoding unit (105) for performing predictive error decoding on an output from the coding unit (103); a reference picture memory (117) for holding output data from the decoding unit (105); and a motion vector detection unit (108) for detecting forward and backward motion vectors on the basis of decoded image data stored in the memory (117). When coding a B picture, a picture thatis timewise closest to the target picture is used as a candidate picture for forward reference, and an I or P picture that is timewise closest to the target picture is used as a candidate picture forbackward reference. The moving image coding apparatus (10) so constructed can improve coding efficiency of a B picture to be subjected to bidirectional predictive coding.

Description

[0001] This application is a divisional application of a Chinese patent application with a filing date of November 6, 2002, an application number of 02803477.5, and an invention title of "Moving Image Coding Method and Moving Image Decoding Method". technical field [0002] The present invention relates to a moving picture decoding method, and more particularly to a method of decoding a picture constituting a moving picture with reference to other pictures of the moving picture. Background technique [0003] Generally, in the encoding of pictures constituting a moving picture, each picture is divided into a plurality of blocks, and the image information contained in each picture is compressed and encoded for each block by utilizing the redundancy in the space direction and the time direction of the moving picture ( Hereinafter, it is also referred to simply as encoding). Here, intra-picture coding using correlation of pixel values ​​in a picture is used as coding using redun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/36H04N7/46H04N7/50G06T9/00H04N19/176H04N19/513H04N19/52H04N19/557
Inventor 近藤敏志角野真也羽饲诚
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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