Abstract

Certain types of optical storage devices are preferentially read out with off-axis illumination. This method, however, produces keystoning of the projected image, which is a serious disadvantage. In this paper a double Keystone system is analyzed in which a controlled distortion is introduced by the input system to compensate for the distortion by the projection system. The necessary equations to solve the system are presented in terms of a single parameter which makes a simple solution practical.

© 1976 Optical Society of America

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