Abstract: In a camera including an image sensor (4R, 4G, 4B) having a sampling frequency (fs), and an optical low-pass filter arrangement arranged in an optical path with the image sensor (4R, 4G, 4B), the optical low-pass filter arrangement comprises a first birefringent optical filter element having a frequency response with a frequency trap point at the sampling frequency (fs) of the image sensor (4R, 4G, 4B), and a second birefringent optical filter element having a frequency response with a first frequency trap point at two thirds of the sampling frequency (fs) of the image sensor (4R, 4G, 4B), and a second frequency trap point at twice the sampling frequency (fs) of the image sensor (4R, 4G, 4B).
Type:
Grant
Filed:
December 20, 1995
Date of Patent:
April 14, 1998
Assignee:
U.S. Philips Corporation
Inventors:
Petrus G. M. Centen, Franciscus P. Van De Weegen, Pieter P. Brouwer