标题： 虚拟制作中压缩使用的解密 显示英文标题

标题： Demystifying the use of Compression in Virtual Production

摘要： 虚拟制作（VP）技术不断改进了现场拍摄的灵活性，并提升了现场音乐会体验。 VP的核心技术依赖于高分辨率、高亮度的LED面板来播放/渲染视频内容。 有效部署存在许多技术挑战，例如： 面板间图像拼接同步、跨面板色彩平衡以及补偿由于摄像机角度变化导致的颜色波动。 鉴于其复杂性和潜在的质量下降，行业更偏好“无瑕”或无损压缩源材料用于显示，这需要大量的存储和带宽。 现代的有损压缩标准如AV1或H.265可以在显著降低比特率和资源需求的情况下保持相同的质量。 目前还没有一个被认可的方法来评估这些标准对质量的影响，当VP场景通过摄像机录制时。 我们提出了一种方法来评估这种影响，通过比较通过VP屏幕播放并通过摄像机录制的无损和有损压缩素材。 我们评估了HAP/NotchLC/Daniel2和AV1/HEVC/H.264在不同GOP大小下从2Mb/s到2000Mb/s的不同比特率下的质量影响。 随后使用几种感知质量指标自动评估摄像机内画面质量，通过LED墙引用原始未压缩源内容。 我们的结果显示，我们可以以几个数量级更低的比特率和存储要求达到与混合编解码器相同的效果，如同步的中间编码器。 显示英文摘要

摘要： Virtual Production (VP) technologies have continued to improve the flexibility of on-set filming and enhance the live concert experience. The core technology of VP relies on high-resolution, high-brightness LED panels to playback/render video content. There are a number of technical challenges to effective deployment e.g. image tile synchronisation across the panels, cross panel colour balancing and compensating for colour fluctuations due to changes in camera angles. Given the complexity and potential quality degradation, the industry prefers "pristine" or lossless compressed source material for displays, which requires significant storage and bandwidth. Modern lossy compression standards like AV1 or H.265 could maintain the same quality at significantly lower bitrates and resource demands. There is yet no agreed methodology for assessing the impact of these standards on quality when the VP scene is recorded in-camera. We present a methodology to assess this impact by comparing lossless and lossy compressed footage displayed through VP screens and recorded in-camera. We assess the quality impact of HAP/NotchLC/Daniel2 and AV1/HEVC/H.264 compression bitrates from 2 Mb/s to 2000 Mb/s with various GOP sizes. Several perceptual quality metrics are then used to automatically evaluate in-camera picture quality, referencing the original uncompressed source content through the LED wall. Our results show that we can achieve the same quality with hybrid codecs as with intermediate encoders at orders of magnitude less bitrate and storage requirements.