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.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.