Dr. Pi-Chun Huang Profile

Dr. Pi-Chun Huang

at National Taiwan Univ

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Proceedings Article | 10 February 2009 Paper

Pattern masking investigations of the second-order visual mechanisms

Pi-Chun Huang, Chien-Chung Chen

Proceedings Volume 7240, 724016 (2009) https://doi.org/10.1117/12.805817

KEYWORDS: Modulation, Curium, Linear filtering, Visualization, Target detection, Spatial frequencies, Visual system, Data modeling, Selenium, Image analysis

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Human visual system is sensitive to both the first-order and the second-order variations in an image. The latter one is especially important for the digital image processing as it allows human observers to perceive the envelope of the pixel intensities as smooth surface instead of the discrete pixels. Here we used pattern masking paradigm to measure the detection threshold of contrast modulated (CM) stimuli, which comprise the modulation of the contrast of horizontal gratings by a vertical Gabor function, under different modulation depth of the CM stimuli. The threshold function showed a typical dipper shape: the threshold decreased with modulation depth (facilitation) at low pedestal depth modulations and then increased (suppression) at high pedestal modulation. The data was well explained by a modified divisive inhibition model that operated both on depth modulation and carrier contrast in the input images. Hence the divisive inhibition, determined by both the first- and the second-order information in the stimuli, is necessary to explain the discrimination between two second-order stimuli.

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