Screen Content Coding Based on HEVC Framework

Screen Content Coding Based on HEVC Framework
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基于HEVC框架的屏幕内容编码

DOI:
10.1109/tmm.2014.2315782
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发表时间:
2014-04
影响因子:
7.3
通讯作者:
Baocai Yin
Baocai Yin
中科院分区:
计算机科学1区
文献类型:
--
作者:
Weijia Zhu;Wenpeng Ding;Jizheng Xu;Yunhui Shi;Baocai Yin

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屏幕内容(例如卡通、典型计算机屏幕的捕获或带有文本叠加或新闻摘要的视频)是视频的重要类别,需要超越现有视频编码技术的新技术。本文分析了屏幕内容的特点以及HEVC对屏幕内容的编码效率。我们提出了一种新的编码方案,采用非变换表示,将屏幕内容分为颜色分量和结构分量。基于所提出的表示,为屏幕内容设计了两种编码模式,以利用屏幕视频序列中的方向相关性和非平移变化。然后,所提出的方案被无缝地合并到HEVC结构中,并实现到HEVC范围扩展参考软件HM9.0中。实验结果表明,与HM9.0相比,该方案实现了高达52.6%的码率节省。平均而言,使用帧内、随机访问和低延迟配置分别可节省 35.1%、29.2% 和 23.6% 的比特率。通过减少锐利边缘周围的振铃伪影并保留文本形状而不模糊,解码视频序列的视觉质量也得到显着改善。
Screen content like cartoons, captures of typical computer screens or video with text overlay or news ticker is an important category of video, which needs new techniques beyond the existing video coding techniques. In this paper, we analyze the characteristics of screen content and coding efficiency of HEVC on screen content. We propose a new coding scheme, which adopts a non-transform representation, separating screen content into color component and structure component. Based on the proposed representation, two coding modes are designed for screen content to exploit the directional correlation and non-translational changes in screen video sequences. The proposed scheme is then seamlessly incorporated into the HEVC structure and implemented into HEVC range extension reference software HM9.0. Experimental results show that the proposed scheme achieves up to 52.6% bitrate saving compared with HM9.0. On average, 35.1%, 29.2% and 23.6% bitrate saving are achieved with intra, random-access and low-delay configurations, respectively. The visual quality of the decoded video sequences is also significantly improved by reducing ringing artifacts around sharp edges and reserving the shape of text without blur.
适用于全色度屏幕内容的混合色度采样率高效视频编码
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