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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 18, Iss. 11 — Nov. 1, 2001
  • pp: 2668–2678

Spatiotemporal interpolation and quality of apparent motion

Manfred Fahle, Anke Biester, and Concetta Morrone  »View Author Affiliations

JOSA A, Vol. 18, Issue 11, pp. 2668-2678 (2001)

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We investigate the conditions under which stimuli in apparent (sampled) motion are indistinguishable from those in smooth motion and compare this discrimination with the precision achieved by the visual system in interpolating apparent motion. In an initial experiment, observers were required to discriminate smooth from apparent motion, at variable step sizes, contrasts, velocities, and stimulus types (broadband line or bar stimuli and grating patches of different spatial frequency). Thresholds for discriminating smooth from sampled motion were ∼40 arc min under optimal conditions, corresponding to the diameter of foveal photoreceptors. The tolerated step size between stations increased with velocity, more so for low- than for high-spatial-frequency stimuli. Tolerated step size decreased with presentation duration and with stimulus contrast. A separate experiment examined precision of interpolation. Vernier offsets were produced through temporal delays along the trajectory of an apparent motion, and thresholds for the discrimination of direction of offset were measured as a function of speed of motion and of distance between stations of apparent motion. Perfect interpolation was achieved for distances between stations of ∼2 arc min. A model based on spatiotemporal filtering at an early stage of processing accounts well for the results of both types of experiments.

© 2001 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1070) Vision, color, and visual optics : Vision - acuity
(330.4060) Vision, color, and visual optics : Vision modeling
(330.4150) Vision, color, and visual optics : Motion detection
(330.6790) Vision, color, and visual optics : Temporal discrimination

Original Manuscript: September 11, 2000
Revised Manuscript: February 20, 2001
Manuscript Accepted: April 27, 2001
Published: November 1, 2001

Manfred Fahle, Anke Biester, and Concetta Morrone, "Spatiotemporal interpolation and quality of apparent motion," J. Opt. Soc. Am. A 18, 2668-2678 (2001)

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