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Method and apparatus for encoding a video stream

A video encoder and video stream technology, applied in image encoding, digital video signal modification, instrumentation, etc., to achieve the effect of reducing encoding complexity

Inactive Publication Date: 2015-02-18
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, there is no method that efficiently takes transparency information into account when performing encoding for YUV / RGB channels and possibly depth information

Method used

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  • Method and apparatus for encoding a video stream
  • Method and apparatus for encoding a video stream
  • Method and apparatus for encoding a video stream

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Embodiment Construction

[0031] Embodiments of the invention are inter alia based on the inventors noting that parts of the video stream intended to preserve transparency can be reconstructed with reduced quality, while there is no appreciable reduction in the overall quality of the final (fused) video stream.

[0032] Embodiments of the invention are also based on the inventors noting that the reduction in quality of these parts may advantageously be taken into account in the encoding step in order to reduce the encoding complexity and / or the bitrate of the video stream.

[0033] According to embodiments of the present invention, certain choices made at the encoder side to improve encoding efficiency also result in a reduction in the complexity of the decoding process.

[0034] Although embodiments of the invention are described below in the context of H.264 and HEVC encoders, this is done for clarity purposes only and is not intended to limit the scope of the invention. Those skilled in the art will...

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PUM

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Abstract

A method for encoding a video stream divided in macroblocks using an encoding scheme, the video stream comprising a transparency level channel, said method comprising: - classifying said macroblocks into inner macroblocks, for which a transparency value provided by said transparency information channel is substantially uniform, and transition macroblocks, for which a transparency value provided by said transparency level channel is not substantially uniform; - determining a statistic of said transparency value for each one of said inner macroblocks; and - configuring a respective parameter of said encoding scheme for each one of said inner macroblocks in function of its respective statistic.

Description

technical field [0001] The present invention relates to the field of video coding, and in particular to the field of video stream coding with transparency information. Background technique [0002] Transparency channels are increasingly being used in various applications to fuse different live video feeds into one video stream. [0003] Currently, there is no method that efficiently takes transparency information into account when performing encoding for YUV / RGB channels and possibly depth information. Contents of the invention [0004] Therefore, it is an object of embodiments of the present invention to exploit the available transparency information to improve coding schemes, in particular to reduce output video rate and / or computational complexity. [0005] According to an aspect of the present invention, there is provided a method of encoding a video stream partitioned into macroblocks using a coding scheme, the video stream comprising a transparency level channel, th...

Claims

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Application Information

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IPC IPC(8): H04N19/196H04N19/176H04N19/11H04N19/109H04N19/117H04N19/124H04N19/14H04N19/21
CPCH04N19/176H04N19/124H04N19/117H04N19/14H04N19/11H04N19/109G06T9/20H04N19/197H04N19/20H04N19/21H04N19/198H04L65/70
Inventor C·史蒂文斯P·龙当阿尔法塞S·范布勒克J-F·麦克
Owner ALCATEL LUCENT SAS