用LCEVC增强VVC编码的超高清视频，画质更优且省带宽。
Subjective evaluation of UHD video coded using VVC with LCEVC and ML-VVC
- 用LCEVC作增强层，提升VVC基础层的超高清画质
- 50%增强层带宽时，主观评分接近甚至超过纯高码率编码
- 适合视频编解码研究者和流媒体系统设计人员参考
本文报告了在多层视频编码配置下，以低复杂度增强视频编码（LCEVC）作为增强层叠加在通用视频编码（VVC）基础层之上的主观质量评估结果。评估遵循此前MPEG多层视频编码评测定义的方法与条件，使用LCEVC测试模型版本8.1对增强层进行编码。测试对比了由高清VVC基础层+ LCEVC增强层重建的超高清输出，与两种参考方案：上采样后的VVC基础层解码、多层VVC（ML-VVC）。考虑了两个工作点，分别对应增强层占总码率约10%和50%的情况。主观评估采用降级类别评分（DCR）方法，由25名参与者完成，覆盖15个SDR和HDR序列。结果包括均值意见分（MOS）及其95%置信区间，支持在限定测试范围内对不同编码方式和工作点的感知质量进行比较。
原文摘要 · Abstract (English)
This paper presents the results of a subjective quality assessment of a multilayer video coding configuration in which Low Complexity Enhancement Video Coding (LCEVC) is applied as an enhancement layer on top of a Versatile Video Coding (VVC) base layer. The evaluation follows the same test methodology and conditions previously defined for MPEG multilayer video coding assessments, with the LCEVC enhancement layer encoded using version 8.1 of the LCEVC Test Model (LTM). The test compares reconstructed UHD output generated from an HD VVC base layer with LCEVC enhancement against two reference cases: upsampled VVC base layer decoding and multilayer VVC (ML-VVC). Two operating points are considered, corresponding to enhancement layers representing approximately 10% and 50% of the total bitrate. Subjective assessment was conducted using the Degradation Category Rating (DCR) methodology with twenty five participants, across a dataset comprising fifteen SDR and HDR sequences. The reported results include Mean Opinion Scores (MOS) with associated 95% confidence intervals, enabling comparison of perceptual quality across coding approaches and operating points within the defined test scope.
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