2次元多重運動正弦波に対する運動知覚特性と焦点調節特性の関俿

摘要

眼の焦点調節状態は，画像までの視距離に応じて変化rnするだけではなく，視距離一定条件であっても，提示画rn像の空間周波数や輝度値などの提示条件，提示rn画像から受ける遠近感などの心理的要因，擬似中間rn調画像（誤差拡散画像）を構成する画点または画点集合rnにより表現された信号成分への注意動作に依存して変rn化することが，静止画像を用いた実験から明らかにされrnている．%This paper clarifies the relationship between the accommodation mechanism and the image processing mechanism in human vision. The stimuli used in the experiments were moving plaid sine waves composed of two kinds of drifting sine waves with different spatial frequencies and moving directions. The motion perception states were specified, and the accommodative responses were measured using an infrared optometer, while focusing on two kinds of drifting components or their coherent component. The following results were obtained: (1) when the perception was switched between motion transparency and motion capture, the accommodation lag for motion capture was larger than that for motion transparency;rn(2) in coherent motion perception, the accommodation lag increased as the coherent component's spatial frequency decreased;rn(3) when the perception was switched among the above three types of perception, the accommodation lag for motion capture and that for coherent motion perception were almost the same and larger than that, for motion transparency. These results suggest that the accommodation mechanism interacts with the image processing mechanism that includes the local motion and the coherent motion detection mechanisms.