Pattern masking investigations of the second-order visual mechanisms

Pi Chun Huang, Chien Chung Chen

研究成果: Conference article同行評審

1 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號724016
期刊Proceedings of SPIE - The International Society for Optical Engineering
7240
DOIs
出版狀態Published - 2009
事件Human Vision and Electronic Imaging XIV - San Jose, CA, United States
持續時間: 2009 一月 192009 一月 22

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 電腦科學應用
  • 應用數學
  • 電氣與電子工程

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