空間周波数チャンネル間の相互作用 : 閾値特性と閾上特性の相違 : 視聴覚技術

概要

論文の詳細を見る
After adapting to a grating pattern, the detection threshold and the apparent contrast for a sinusoidal test grating were determined as a function of spatial frequency. For the threshold performance, the contrast thresholds were selectively elevated after the grating adaptation. The threshold elevation was observed only within the spatial frequency range of 1 octave above the adaptation frequency. On the other hand for the supra-threshold performance the reduction of apparent contrast as a function of the test frequency showed different functional form depending on the contrast level. The results suggest the existence of two mechanisms which control the sensitivities of spatial-frequency-selective channels. One is the within-mechanism which may control the threshold of individual channel. showing a narrow-band property. The other is the between-mechanism which may control the gain of channel means of a mutual inhibition among different channels.
社団法人映像情報メディア学会の論文
1994-11-25