Patents Examined by Jacqueline B. Wilson
  • Patent number: 5739855
    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