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Method, device and program for encoding and decoding a sequence of images

An image and sequence technology, applied in image communication, digital video signal modification, electrical components, etc., can solve problems such as inadaptability to different changes in image pixel content

Active Publication Date: 2014-08-06
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0041] A drawback of the known process for the selection of compensation is that the process does not adapt to different variations in image pixel content and to different types of composition of image pixels

Method used

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  • Method, device and program for encoding and decoding a sequence of images
  • Method, device and program for encoding and decoding a sequence of images
  • Method, device and program for encoding and decoding a sequence of images

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Embodiment Construction

[0086] A major description of embodiments of the present invention is provided later in the section entitled "Region-wise Loop Filtering Embodiments". Heretofore, other inventive embodiments will be explained and are useful for understanding loop filtering embodiments in units of regions.

[0087] Figure 5 A data communication system is shown in which one or more embodiments of the invention may be implemented. The data communication system comprises a sending device (in this case a server 501), wherein the server 501 is operable to send packets of a data stream to a receiving device (in this case a client terminal 502) via a data communication network 500 . Data communication network 500 may be a wide area network (WAN) or a local area network (LAN). Such a network may for example be a wireless network (Wifi / 802.11a or b or g), Ethernet (Ethernet), the Internet, or a hybrid network comprising several different networks. In a specific embodiment of the present invention, ...

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Abstract

A method of encoding a sequence of images comprises performing area-by-area loop filtering on at least one image of the sequence and disabling such area-by-area loop filtering on at least one other image of the sequence. The images of the sequence are associated with respective levels from a plurality of levels, the levels corresponding to different respective rate-distortion balances or to different image qualities, and the images on which the area-by-area loop filtering is disabled are determined in dependence upon the levels.

Description

technical field [0001] The present invention relates to methods, devices and programs for encoding or decoding digital image sequences. [0002] The invention can be applied in the field of digital signal processing, especially in the field of video compression using motion compensation to reduce spatial redundancy and temporal redundancy in video streams. Background technique [0003] Many video compression formats such as H.263, H.264, MPEG-1, MPEG-2, MPEG-4, SVC, etc. use block-based discrete cosine transform (DCT) and motion compensation to remove spatial and temporal redundancy . These formats are often referred to as predictive video formats. Each frame or image of a video signal is divided into coded and independently decodable slices. A slice is typically a rectangular portion of a frame, or more typically a portion or the entire frame. Furthermore, each slice may be partitioned into macroblocks (MBs), and each macroblock further partitioned into blocks, typicall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/117H04N19/13H04N19/86H04N19/136H04N19/82
CPCH04N19/00121H04N19/00066H04N19/00896H04N19/00533H04N19/00139H04N19/00909H04N19/0089H04N19/85H04N19/117H04N19/13H04N19/136H04N19/139H04N19/14H04N19/44H04N19/80H04N19/82H04N19/86H04N19/61H04N19/895H04N19/147H04N19/182H04N19/132H04N19/186H04N19/172
Inventor G·拉罗彻C·吉斯科特E·弗朗考伊斯P·乌诺
Owner CANON KK