HDR还是SDR?这是一个很好的选择. 对缩放和压缩视频进行主观和客观研究
概括
高动态范围 (HDR) 和标准动态范围 (SDR) 的主观视频质量取决于显示类型,分辨率和压缩. HDR并不总是比SDR更受欢迎,尤其是在某些以较低比特率的显示器上.
科学领域:
- 感知视频质量评估 视频质量评估
- 高动态范围 (HDR) 和标准动态范围 (SDR) 成像.
- 视频压缩和缩放的缩放.
背景情况:
- 传统智慧表明,高动态范围 (HDR) 视频与标准动态范围 (SDR) 相比,提供更优质的质量.
- 然而,现实世界的观看条件,包括显示技术,分辨率缩放和压缩水平 (比特率),可以显著影响感知质量.
- 了解这些相互作用对于优化视频交付和质量评估至关重要.
研究的目的:
- 在各种观看条件下调查人类对HDR与SDR视频的感知质量判断.
- 评估现有的视频质量模型的性能,并为各种场景开发一个新的,更准确的模型.
主要方法:
- 从67名志愿者收集了超过23,000个质量评分,评估了356个视频.
- 视频在HDR/SDR格式,分辨率缩放,压缩级别等方面有所不同,并且可以在OLED,QLED和LCD显示器上观看.
- 测试了已建立的全参考和无参考视频质量模型,并开发了一个新的无参考模型 (HDRPatchMAX).
主要成果:
- 对SDR而言HDR的主题偏好高度依赖于显示设备,分辨率缩放和比特率.
- 在较低比特率的HDR视频的评分往往低于SDR视频,特别是在LCD和QLED显示器上.
- 新的HDRPatchMAX模型在预测视频质量方面比现有指标更准确.
结论:
- HDR与SDR的优势不是普遍的,取决于观看条件和显示技术.
- 准确的视频质量评估需要考虑显示特定特征和压缩工件的模型.
- 开发的HDRPatchMAX模型为复杂场景中的客观视频质量预测提供了有希望的进步.
相关概念视频
01:22Upsampling
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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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01:20Downsampling
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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
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