Stephen Wolf and Margaret H. Pinson

Abstract: Contribution T1A1.5/93-152 summarized the methods of measurement for objective video quality parameters based on the Sobel-filtered image and the motion difference image that were submitted prior to conducting the T1A1 subjective experiment (this experiment collected 625 mean opinion scores - i.e., 25 test scenes passed through 25 different video transmission systems that ranged in bit rate from 64 kb/sec to 45 Mb/sec). This contribution presents (1) one minor correction to the recommended value for the fraction above threshold in contribution T1A1.5/93-152, and (2) a method for estimating the video delay uncertainty of the automated time alignment algorithm presented in section 3 of contribution T1A1.5/93-152 (non-zero video delay uncertainty may result when dynamic time warping, or variable video delay, is present in the video transmission system, or when there is a substantial number of dropped video frames), (3) a method for using this video delay uncertainty in the computation of the parameters presented in T1A1.5/93-152, and (4) an improved motion spike detector that could be used for computing parameters p10 and p11 in T1A1.5/93-152.

Keywords: coding; performance; measurements; video; quality; metrics; parameters; objective; delay; dropped; frames; variable; Testing; compression; artifacts; motion

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