压缩视频电话会议质量的梯度测量

[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings Pub Date : 1991-05-09 DOI:10.1109/PACRIM.1991.160753

E.A. Quincy

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引用次数: 4

摘要

提出了从接收到的数字图像中计算出的两种可用于评估视频质量的客观度量。这些基于拉普拉斯和索贝尔梯度算子的度量方法被开发并应用于实时桌面场景和带有运动的会议桌场景的视频电话会议(VTC)序列。测量结果然后在传输比特率的范围内进行比较。通过确定最佳灰度阈值来计算度量值，提高了度量值的灵敏度和可靠性。这两种度量都随着传输速率和相应的图像说明性主观评价而单调增加。这些措施已被提议纳入ANSI T1Q1.5电话会议标准小组正在制定的国家VTC标准草案中。

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Gradient measures of compressed video teleconferencing quality

Two objective measures, computed from received digital images, that can be used to assess video quality are proposed. These measures, based on Laplacian and Sobel gradient operators, are developed and applied to video teleconferencing (VTC) sequences of live desktop scenes and conference table scenes with motion present. The measured results are then compared over a range of transmission bit rates. The sensitivity and reliability of the measures are enhanced by determining the optimum gray level thresholds for computing the measures. Both measures are shown to monotonically increase with transmission rate and corresponding illustrative subjective evaluation of the images. These measures have been proposed for possible inclusion into a draft National VTC Standard under development in the ANSI T1Q1.5 teleconferencing standards group.<>

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来源期刊

[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings

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