PURPOSE: To project an image of a planar structure as a natural stereoscopic image by projecting real images to a left and a right eye and a complementary- color image alternately and periodically.

CONSTITUTION: An odd left-eye image field 1 and an even left-eye image field 3 constitute one left-eye image photodetected by the left eye, and an odd right-eye image field 2 and an even right-eye image field 4 constitute one right-eye image photodetected by the right eye. The left and right-eye images have a parallax and a one-frame image consists of four fields. The respective fields are projected at intervals of 1/60sec and projected repeatedly in the order of the fields 1, 2, 3, and 4. Each field is fractionized into specific sections and consists of fine square areas 5; real images are formed in alternate areas 5, and complementary-color images are formed in the other alternate areas 5.