Margaret H. Pinson and Stephen Wolf

Abstract: This contribution presents a new technique for estimating temporal delays between input and output video streams from video teleconferencing systems. The discussion in this contribution is limited to "constant alignment," defined as an alignment process that computes the same fixed alignment offset, or delay, for every output video frame in a given output video sequence. Constant alignment can (1) serve as a starting point for variable alignment techniques, where each output frame can have a unique alignment offset, or delay, and (2) be used to align low frame rate output video sequences in preparation for measuring video quality parameters. The constant alignment technique that is presented is applicable for real-time in-service monitoring since it utilizes a set of computationally efficient low bandwidth features that are extracted from the input and output video streams.

Keywords: video delay; temporal alignment; low bandwidth features

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