G - Physics – 02 – B
Patent
G - Physics
02
B
88/121, 350/48,
G02B 27/00 (2006.01) G02B 27/46 (2006.01) H04N 3/14 (2006.01)
Patent
CA 1293881
ELECTRONIC IMAGING APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE An electronic imaging system includes an optical system for imaging radiation from a scene onto the image sensing surface of an imaging device for a selected sample period. The imaging device may take the form of a two dimensional array of photoresponsive areas having a device specific upper spatial frequency limit. In order to eliminate alias signal components in the output video signal caused by spatial frequency components in the scene radiation greater than the Nyquist spatial frequency of the device, the optical system is designed to have a spatial frequency limit no higher than the Nyquist frequency of the imaging device and thus functions as a low pass optical filter. The spatial frequency response of the optical components can be controlled by controlling the rotationally sym- metric aberrations, and in the preferred form, higher order terms, third and above, which contribute to the spherical aberration of a lens system are designed to have balancing non-zero values to provide the necessary characteristics of the modulation transfer function of the optical system.
538413
Polaroid Corporation
Smart & Biggar
LandOfFree
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