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Video frequency endong device and mehtod for solving local lightness variation

一种局部亮度、视频编码的技术，应用在视频编码领域，能够解决限制WP效率、运动估计复杂性等问题

Inactive Publication Date: 2012-05-30
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the number of reference pictures that can be used in H.264 is limited by the current state of the art and framework, or by the complexity of motion estimation
This considerably limits the efficiency of the WP during local brightness changes

Method used

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  • Video frequency endong device and mehtod for solving local lightness variation
  • Video frequency endong device and mehtod for solving local lightness variation
  • Video frequency endong device and mehtod for solving local lightness variation

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Embodiment Construction

[0032] According to an embodiment of the present invention, a new compression method for dealing with local brightness variations is proposed. In this embodiment, a DC difference image is generated by subtracting the current picture and the reference picture, and the reference picture is reconstructed by adding the generated DC image.

[0033] From Equation 1 above, it is also noted that in order to be able to efficiently handle local brightness variations, it may be necessary to encode a large set of weighting parameters a and b. Unfortunately, this creates two problems: 1) many bits are required to encode these parameters; and 2) considering that all possible sets of a and b need to be used to generate the required reference and perform motion estimation / compensation (ME ), the computational complexity, mainly in the encoder, will be quite high.

[0034]According to an embodiment of the present invention, assuming that the spatial variation of intensity in a region is small...

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Abstract

There is provided a compression method for handling local brightness variation in video. The compression method estimates the weights from previously encoded and reconstructed neighboring pixels of the current block in the source picture and their corresponding motion predicted (or collocated) pixels in the reference pictures. Since the information is available in both the encoder and decoder forderiving these weights, no additional bits are required to be transmitted.

Description

technical field [0001] The present invention relates to video coding, and more particularly, to a method for dealing with local brightness variations in video using locally weighted prediction (LWP). Background technique [0002] Video codecs benefit greatly from their compression efficiency by forming a reference picture prediction of the picture to be encoded, and using motion compensation (ie, inter prediction) to encode only the differences between the current picture and that prediction. The more related the prediction is to the current picture, the fewer bits are needed to compress that picture. [0003] In early video codecs, previously decoded pictures were used to form reference pictures, unfortunately, when severe temporal brightness variations are involved, for example due to lighting changes, fade-in / out effects, camera flashes, etc., traditional motion-compensated will fail. [0004] The JVT / H.264 / MPEG4 AVC video compression standard is the first international...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/34H04N7/50H04N19/176H04N19/51
CPCH04N19/00781H04N19/00315H04N19/00763H04N19/00145H04N19/00896H04N19/00024H04N19/00351H04N19/00545H04N19/00884H04N19/00266H04N19/00278H04N19/00175H04N19/00036H04N19/00909H04N19/00551H04N19/00369H04N19/105H04N19/109H04N19/137H04N19/147H04N19/172H04N19/176H04N19/186H04N19/19H04N19/196H04N19/46H04N19/463H04N19/593H04N19/61H04N19/70H04N19/82H04N19/86H04N19/51
Inventor 尹鹏吉尔·麦克唐纳·布瓦斯亚力山德罗斯·图拉皮斯
Owner THOMSON LICENSING SA