METHOD FOR CALIBRATING A DIGITAL OPTICAL IMAGING SYSTEM HAVING A ZOOM SYSTEM, METHOD FOR CORRECTING ABERRATIONS IN A DIGITAL OPTICAL IMAGING SYSTEM HAVING A ZOOM SYSTEM, AND DIGITAL OPTICAL IMAGING SYSTEM

摘要

The invention relates to a method for calibrating a digital optical imaging system, comprising at least one motorized or coded zoom system and an image sensor, to a method for correcting aberrations in such an imaging system, and to an optical imaging system which is configured to carry out the methods according to the invention. During the calibration method, a reference object is recorded in various zoom settings and the image is corrected pixel-wise with digital-optical means using a previously determined model. To this end, distortion correction coefficients and image stability correction coefficients are ascertained. The real total magnification of the system is ascertained from the corrected image. The model ascertained in the calibration process also serves for correcting aberrations during operation of the imaging system.

主权项

1. A method for calibrating a digital optical imaging system, comprising at least one motorized or coded zoom system and an image sensor, comprising the following steps:
placing a reference object under the imaging system; selecting and storing a zoom setting of the zoom system in a reference table; recording a reference image by imaging the reference object on the image sensor; dividing the reference image into at least three color channel reference images RR RG RB; fitting an ideal image into the reference image and ascertaining an image center in position and orientation; ascertaining a position error vector for n reference points of the reference object in each of the color channel reference images; storing the ascertained position error vectors in a reference table; repeating the previously mentioned steps for at least three different zoom settings.