Correction of keystone distortion in tilted imaging systems using a digital micro-mirror

摘要

To reduce keystone distortion in tilted imaging systems when the object area is much larger than the lens diameter, an optical system design using a digital micro-mirror device (DMD) is proposed. Keystone distortion is analyzed, establishing the relationships between keystone distortion and object height, tilt angle of the object plane, focal length, and object distance. A design with a DMD in a reimaging setup is analyzed, providing a solution that eliminates keystone distortion in tilted imaging systems. The method is validated by simulation and experiment it provides an innovative method to correct keystone distortion without digital signal processing. (C) 2019 Optical Society of America