An apparent 3-D image can be perceived from only two 2-D images displayed at different depths, when an observer views them from the direction in which they are overlapped. The two 2-D images are created from an original 2-D image by dividing its luminance according to independently obtained depth information. Subjective test results show that (1) an apparent 3-D image is perceived and (2) the perceived depth continuously varies according to the change in luminance ratio between the two 2-D images.

We found that 30 % of non-stereoanomalous observers, aged 19 to 25 years old, did not use disparity in making depth judgments in 3D-graphic environments. However, several questionnaires indicate that the use of disparity can be learned unconsciously, suggesting that poor stereopsis can be improved by appropriate training procedures.

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We propose a real-time color simulator employing (1) 90-degreehue-rotation method (supports red-green opponent color perception for dichromacy) and (2) simple red-green hue reduction method (enables red-green color deficiency). Subjective test results suggest that the proposed simulator will greatly help mutual understanding of color perception.