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SUMMARY:Image quality assessment across viewing distances: A comparison st
 udy of CSF-based and rescaling-based metrics - Dounia Hammou\, Univ. of Ca
 mbridge
DTSTART:20240111T140000Z
DTEND:20240111T150000Z
UID:TALK210430@talks.cam.ac.uk
CONTACT:Rafal Mantiuk
DESCRIPTION:Assessing the quality of images often requires accounting for 
 the viewing conditions - viewing distance\, display resolution and size.  
 For example\, the visibility of compression distortions may differ substan
 tially when a video is viewed on a smartphone from a short distance and wh
 en viewed on a TV from a large distance. Nonetheless\, traditional metrics
  are limited when applied across a diverse range of users with a diverse r
 ange of viewing environments. Metrics that account for these viewing condi
 tions typically rely on contrast sensitivity functions (CSFs). However\, i
 t is also possible to rescale the input images to account for the change i
 n the viewing distance. In a recent study comparing these two types of met
 rics\, we did not observe any statistical difference between the metrics. 
 Hence\, in this paper\, we use Fourier analysis to study the similarities 
 and differences between the mechanisms of CSF-based and rescaling-based me
 trics. We compare the behaviour of each approach and investigate the corre
 lation between their predictions across the viewing distances. Our finding
 s demonstrate a similarity between the two approaches for high-frequency d
 istortions when the viewing distance is increased (the images are downscal
 ed)\, but not when the viewing distance is decreased (the images are upsca
 led) or when accounting for low-frequency distortions.\n\nZoom link: https
 ://cam-ac-uk.zoom.us/j/83285904138?pwd=cExka3FZTm5yUnNJWjZxcGc4SnFNQT09\n
LOCATION:SS03 - William Gates Building
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