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Perception of Extremely Low-Rate Images and Video: Psychophysical Evaluations and Analyses

Wednesday, January 31, 2001 - 11:00am - 12:00pm
Lind 400
Sheila Hemami (Cornell University)
Despite the seemingly constant increases in available bandwidth, images and video encoded at low rates are currently and will continue to be commonly used for visual communication. Time and expense are two motivations for the use of low-rate encoded content, and for some access modes such as 3G wireless systems, only low-rate encoded images and video can be transmitted. To maximize the access to digitally archived information, low-rate-encoded versions of the content should be made available. At such rates, compression artifacts are clearly visible. To maximize perceived quality, characteristics of the human visual system (HVS) should be considered. Perceptually motivated image compression research has focused on producing visually lossless images, and very little work has been done on understanding perception of low-rate video. This talk will describe our recent work on characterizing human perception of low-rate encoded images and video, and will discuss applications to compression.