Margaret H. Pinson and Stephen Wolf

Abstract:

Digital video compression algorithms are being deployed that spatially stretch or shrink the video picture. Although small changes in spatial scaling are not usually noticeable to viewers, objective video quality measurement systems may be adversely impacted if the spatial scaling is not corrected. This report describes an algorithm that can be used to automatically measure the amount of spatial scaling present in a video system. This algorithm obtains satisfactory computational complexity by (1) separating the searches for horizontal & vertical scaling factors, (2) using image profiles rather than full images, and (3) using random rather than exhaustive searching techniques.

Keywords: video quality; objective; calibration; random search; spatial scaling

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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