Optical blurring filter which is resistant to digital image rest

Details Optical blurring filter which is resistant to digital image rest Optical blurring filter which is resistant to digital image rest

1998-07-10

2000-04-18

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By surface composed of lenticular elements

359619, B02B 2710

Patent

active

060522305

ABSTRACT:
An optical filter for intentionally blurring camera images has a generally transparent material and a plurality of optical distortions formed in the transparent material. Placement of the transparent material longitudinally in the optical path of a camera in front of the aperture stop allows contouring the blur across the image plane. That contour is preferably random, so as to defeat digital methods for image restorations. Additionally, a linear gradient is utilized to even-out the ground resolution on oblique cameras or localized to even-out resolution on cameras that have areas of unwanted high resolution.

REFERENCES:
patent: 4175844 (1979-11-01), Glaser-Inbari
patent: 5453844 (1995-09-01), George et al.
patent: 5479026 (1995-12-01), Schumtz et al.
patent: 5581408 (1996-12-01), Schumtz et al.
patent: 5768022 (1998-06-01), Lawandy

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