Video quality gradient measures for digital networks

Author

Quincy, Edmund

Author_Institution

US Dept. of Commerce, Boulder, CO, USA

fYear

1990

fDate

30 Sep-3 Oct 1990

Firstpage

289

Abstract

Two of the most significant video quality degradations produced by digital compression in codecs are image blurring and distortion of edges in areas of motion. These degradations become more evident at reduced transmission rates. Two objective measures of video quality, one based on Laplacian and the other on Sobel gradient operators, are proposed. They are validated with desktop video teleconferencing (VTC) data for digital networks with sequences containing significant motion and complex detail. The measured results are 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 correlate well with transmission rate and subjective opinion of the video quality, particularly for blurring

Keywords

codecs; digital communication systems; picture processing; telecommunication networks; teleconferencing; video signals; Gray level thresholds; Laplacian operator; Sobel gradient operators; bit rates; codecs; desktop video teleconferencing; digital compression; digital networks; edge distortion; gradient measures; image blurring; objective measures; picture processing; reliability; sensitivity; transmission rates; video quality degradations; Codecs; Degradation; Design automation; Digital images; Distortion measurement; Laplace equations; Motion measurement; Teleconferencing; Video compression; Video sharing;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 1990. MILCOM '90, Conference Record, A New Era. 1990 IEEE

Conference_Location

Monterey, CA

Type

conf

DOI

10.1109/MILCOM.1990.117430

Filename

117430