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Image encoding device and encoding method, and image decoding device and decoding method

An image encoding and decoding device technology, applied in image communication, television, electrical components, etc., can solve problems such as low compression efficiency, and achieve the effect of improving compression efficiency and improving compression efficiency.

Inactive Publication Date: 2009-05-06
HITACHI LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only applicable to the block at the picture end, and the effect of improving the compression efficiency is small

Method used

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  • Image encoding device and encoding method, and image decoding device and decoding method
  • Image encoding device and encoding method, and image decoding device and decoding method
  • Image encoding device and encoding method, and image decoding device and decoding method

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Embodiment Construction

[0031] Embodiments of the present invention will be described below with reference to the drawings.

[0032] image 3 This is a conceptual diagram for explaining the operation of the intra-screen prediction encoding process of H.264 / AVC. In H.264 / AVC, encode the encoding target image in the order of raster scanning (301), and use the decoded images of the four encoded blocks adjacent to the left, upper left, upper, and upper right of the encoding target block. predict.

[0033] In particular, 13 encoded pixels (302) included in these blocks are used for prediction, and among the pixels included in the encoding target block, the pixels on the same straight line with the prediction direction vector as inclined are all from the same pixels for prediction. That is, the 13 pixels are pixels arranged adjacent to the encoding target block among the pixels contained in the four blocks, the left block is the four pixels in the rightmost column, the upper left block is a pixel in the...

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PUM

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Abstract

In an image encoding / decoding device of the present invention, the prediction direction in a target block, i.e., a block which becomes the target of the intra-frame prediction processing, is estimated by taking advantage of pre-encoded blocks which are adjacent to the target block. First, as edge information on decoded images on the adjacent blocks, intensities and angles of the edges are calculated. Next, of the degrees of likelihood calculated with respect to each prediction direction by taking advantage of this edge information and, e.g., a neural network, the prediction direction whose degree of likelihood is the highest is employed as the prediction direction in the target block. Also, a variable-length code table is dynamically created based on the estimated result, which allows a significant reduction in the prediction-direction representing code amount.

Description

technical field [0001] The present invention relates to an image encoding technique for encoding an image such as a moving picture or a still picture, and an image decoding technique for decoding an image. Background technique [0002] As a method for storing and transmitting large-capacity moving image information as digital data, encoding methods such as the MPEG (Moving Picture Experts Group) method have been established. An encoding method that has become an international standard such as the MPEG-1 standard, the MPEG-2 standard, the MPEG-4 standard, the H.264 / AVC (Advanced Video Coding) standard, and the like. These methods have been adopted as encoding methods for digital satellite broadcasting, DVDs, mobile phones, digital cameras, etc., and are now widely used and become personal methods. [0003] In these standards, image information to be encoded is predicted on a block-by-block basis using encoded image information, and redundancy associated with moving images is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/34H04N19/50H04N19/11H04N19/13H04N19/134H04N19/136H04N19/14H04N19/147H04N19/176H04N19/182H04N19/196H04N19/593H04N19/60H04N19/61H04N19/625H04N19/91
CPCH04N19/00781H04N19/00278H04N7/26026H04N19/00763H04N7/26244H04N19/00042H04N19/00775H04N7/26106H04N19/00157H04N7/26127H04N7/50H04N19/00121H04N7/30H04N7/345H04N19/176H04N19/13H04N19/61H04N19/60H04N19/593H04N19/11H04N19/14G06N3/084
Inventor 高桥昌史村上智一
Owner HITACHI LTD
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