Mixed Chroma Sampling-Rate High Efficiency Video Coding for Full-Chroma Screen Content

Mixed Chroma Sampling-Rate High Efficiency Video Coding for Full-Chroma Screen Content
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适用于全色度屏幕内容的混合色度采样率高效视频编码

DOI:
10.1109/tcsvt.2012.2223871
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发表时间:
2013
影响因子:
8.4
通讯作者:
Chen, Xianyi
Chen, Xianyi
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhang, Peijun;Wang, Shuhui;Zhou, Kailun;Chen, Xianyi

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计算机屏幕包含不连续音内容和连续音内容。因此,屏幕内容编码(SCC)最有效的方法是使用两种本质上不同的编码器:字典熵编码器和传统的混合编码器。虽然屏幕内容最初是全色度(例如YUV444)格式,但当前的压缩方法是首先对图片的色度进行子采样,然后使用色度子采样(例如YUV420)编码器压缩图片。使用两个色度下采样编码器不能实现高质量的SCC,但使用两个全色度编码器对SCC来说是多余的和低效的。为了解决这一难题,本文提出了一种用于SCC的混合色度采样率方法。对原始的全色度输入宏块(编码单元)或其预测残差进行色度下采样。同时使用一个全色度基编码器和一个色度下采样基编码器分别对原始宏块和色度下采样宏块进行编码。选择最小率失真(R-D)编码器作为宏块的最终编码器。两个基本编码器进行了连贯统一和优化,以获得最佳的整体编码性能,并尽可能地共享编码组件和资源。该方法以最小的计算复杂度增量实现了非常高的视觉质量,并且具有比两种全色度编码器方法更好的R-D性能,特别是在低比特率下。
Computer screens contain discontinuous-tone content and continuous-tone content. Thus, the most effective way for screen content coding (SCC) is to use two essentially different coders: a dictionary-entropy coder and a traditional hybrid coder. Although screen content is originally in a full-chroma (e.g., YUV444) format, the current method of compression is to first subsample chroma of pictures and then compress pictures using a chroma-subsampled (e.g., YUV420) coder. Using two chroma-subsampled coders cannot achieve high-quality SCC, but using two full-chroma coders is overkill and inefficient for SCC. To solve the dilemma, this paper proposes a mixed chroma sampling-rate approach for SCC. An original full-chroma input macroblock (coding unit) or its prediction residual is chroma-subsampled. One full-chroma base coder and one chroma-subsampled base coder are used simultaneously to code the original and the chroma-subsampled macroblock, respectively. The coder minimizing rate-distortion (R-D) is selected as the final coder for the macroblock. The two base coders are coherently unified and optimized to get the best overall coding performance and share coding components and resources as much as possible. The approach achieves very high visual quality with minimal computing complexity increment for SCC, and has better R-D performance than two full-chroma coders approach, especially in low bitrate.
DOI: 10.1109/cisp.2010.5647270
发表时间: 2010-11
期刊: 2010 3rd International Congress on Image and Signal Processing
影响因子: --
作者:
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DOI: 10.1109/icme.2009.5202873
发表时间: 2009-06
期刊: 2009 IEEE International Conference on Multimedia and Expo
影响因子: --
作者:
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DOI: 10.1109/cisp.2009.5301019
发表时间: 2009-10
期刊: 2009 2nd International Congress on Image and Signal Processing
影响因子: --
作者:
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发表时间: 2010-04
影响因子: 10.6
作者:
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DOI: --
发表时间: 2001
期刊: --
影响因子: --
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