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Motion blur and motion sharpening: temporal smear and local contrast non-linearity
S T Hammett1, M A Georgeson, A Gorea
1Department of Psychology, University of Glasgow, UK. shammett@psy.gla.ac.uk
Vision Research
|November 3, 1998
Summary
Moving blurred images can appear sharper, while sharp moving edges can seem blurrier. This study explains this paradox using visual temporal integration and contrast non-linearity, involving M and P cells.
Area of Science:
- Visual perception
- Neuroscience
Background:
- Perceived image sharpness can differ between static and moving patterns.
- Motion can paradoxically enhance or degrade edge sharpness.
Purpose of the Study:
- To investigate the perceived sharpness of moving blurred patterns compared to static ones.
- To resolve the paradox of motion affecting sharpness differently based on blur extent.
Main Methods:
- Comparing perceived sharpness of drifting and static square wave gratings.
- Systematically varying pattern speed, blur extent, and spatial frequencies.
- Developing a quantitative model for motion-induced waveform distortion.
Main Results:
- Motion sharpening occurred for large blurs (> 10 min arc).
- Motion blurring occurred for small blurs (< 10 min arc).
- A model incorporating temporal integration and contrast non-linearity explained the results.
Conclusions:
- Visual perception of sharpness depends on the interplay between motion speed, blur extent, and contrast.
- A dual mechanism involving temporal smearing and local contrast enhancement explains motion-dependent sharpness changes.
- Differential M and P cell recruitment may underlie the observed speed-dependent non-linearity.