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19 January 2009 Perception of time variable quality of scene objects
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Proceedings Volume 7242, Image Quality and System Performance VI; 72420X (2009)
Event: IS&T/SPIE Electronic Imaging, 2009, San Jose, California, United States
The paper focuses on testing the user perception of time-variable quality of scene objects. The scenes are generated and presented by the DMP (Distributed Multimedia Plays) packet-based system for futuristic continental multimedia collaboration. DMP guarantees maximum user-to-user delay and minimum scene quality. Time-variable scene quality control is obtained by adapting the composition and object resolution to traffic load in the network, by controlled dropping of sub-objects in network nodes, and by admission control. The perceived quality of scenes was tested using an existing DMP performance (simulation) model that generates two-dimensional random distributions for the frequency of overloads in the network nodes versus packet drop rate and duration. Video clips with time-varying scene quality were synthesized, and showed to test persons. Four sub-objects of spatial resolution 1400 x 1050 pixels, and temporal resolution of 60Hz was applied. Sub-objects were dropped in the network, and missing sub-objects were regenerated by standard linear interpolation techniques. Test persons could perceive a moderate average quality reduction 13 on a 0-100 quality scale when 75% of the sub-objects were dropped and interpolated. To improve the quality, edge detection and correction was added. The test persons could perceive a small average quality reduction of 8 on a 0-100 quality scale when 75% of the sub-objects were dropped.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Leif A. Ronningen and Erlend Heiberg "Perception of time variable quality of scene objects", Proc. SPIE 7242, Image Quality and System Performance VI, 72420X (19 January 2009);

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