Emerging cloud-based video streaming applications suggest limitations on current video streaming systems and emphasize the need to preserve and exchange high-quality contents while minimizing processing latency, given that both are critical in perpetuating a high user-perceived quality. This article presents 4KODEC, a codec for supporting real-time high-quality videos for cloud-based video streaming. 4KODEC is designed to induce minimal latency when encoding and decoding 4K video frames, by exploiting the fact that many regions (tiles) of a 4K frame can be recovered from their 2K counterparts given the low-complexity embedded in most tiles. Furthermore, 4KODEC is designed to effectively identify complex tiles, so that original 4K representations can be selectively exchanged to maintain high quality. We present evaluations using four different 4K-quality online games to show that 4KODEC reduces the processing latency by nearly half while improving perceptual quality when compared to widely used H.264/265 codec-based 4K video streaming implementations.

中文翻译：

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低质量换高质量：利用 2K 帧支持高效的 4K 质量普及视频流应用

新兴的基于云的视频流应用表明当前视频流系统存在局限性，并强调需要保留和交换高质量内容，同时最大限度地减少处理延迟，因为两者对于保持高用户感知质量至关重要。本文介绍了 4KODEC，这是一种支持基于云的视频流实时高质量视频的编解码器。4KODEC 旨在通过利用 4K 帧的许多区域（图块）可以从其 2K 对应部分中恢复的事实，在编码和解码 4K 视频帧时引入最小延迟，因为大多数图块中嵌入的复杂性较低。此外，4KODEC 旨在有效识别复杂的图块，以便可以有选择地交换原始 4K 表示以保持高质量。