Browse Prior Art Database

Eliminating CCD Camera Array Saturation Using Polarizing Material

IP.com Disclosure Number: IPCOM000037642D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Durdik, PA: AUTHOR

Abstract

Disclosed is a method of reducing light entering a camera lens to prevent saturation of the CCD array by interposing polarizing material between camera lens and light source.

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Eliminating CCD Camera Array Saturation Using Polarizing Material

Disclosed is a method of reducing light entering a camera lens to prevent saturation of the CCD array by interposing polarizing material between camera lens and light source.

A problem encountered with solid state cameras used to view both luminous and non-luminous subjects is that f-stop settings which facilitate viewing of the non-luminous subject causes too much light to impinge on the camera's CCD array from the luminous subject. This causes saturation or "blooming."

The classical solution is to use a servo driven f-stop on the camera lens. This proves to be too costly in situations where multiple cameras are required.

Two pieces of polarizing material may be placed between the camera lens and light source. Rotating one piece with respect to the other via electromechanical actuator controls the amount of light passing into the camera lens.

Alternatively, an electromechanical actuator may be employed to interpose polarizing material between lens and subject as needed.

Anonymous.

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