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Related Experiment Videos

No role for motion blur in either motion detection or motion-based image segmentation

F A Wichmann1, G B Henning

  • 1Department of Experimental Psychology, University of Oxford, UK. felix.wichmann@psy.ox.ac.uk

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|February 11, 1998
PubMed
Summary

Motion blur, a loss of high-spatial-frequency content in moving images, does not aid motion detection or image segmentation. The human visual system does not use this blur as a cue in everyday situations.

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Area of Science:

  • Visual Neuroscience
  • Perception Psychology
  • Image Processing

Background:

  • Human contrast sensitivity is bandpass for low temporal frequencies but low pass for moving stimuli.
  • Moving images lose high-spatial-frequency content, a phenomenon known as motion blur.
  • Motion blur is a function of stimulus velocity and significant in everyday visual scenarios.

Purpose of the Study:

  • To investigate the influence of motion-induced high-spatial-frequency losses on motion detection.
  • To determine the role of motion blur in motion-based image segmentation.
  • To compare the salience of motion versus motion-induced blur as visual cues.

Main Methods:

  • Experiments involved motion detection and image segmentation tasks using spectrally low-pass or broadband stimuli.

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  • Performance was compared between conditions with actual motion and static conditions mimicking perceptual blur.
  • Controlled for form differences to isolate the effect of motion-induced high-spatial-frequency loss.

    • Main Results:

    • Neither motion detection nor motion-based image segmentation performance was sensitive to the high-spatial-frequency content of stimuli.
    • The perceptual changes in form caused by motion blur were not utilized as cues in the tested tasks.
    • Motion blur did not enhance performance in either motion detection or image segmentation.

    Conclusions:

    • The human visual system does not typically use motion blur as a cue for detecting motion.
    • Motion-induced changes in perceptual form are not normally exploited for motion-based image segmentation.
    • In everyday situations, the visual system relies on factors other than motion blur for these perceptual tasks.