Method of luminance compensation for a camera lens using...

Details Method of luminance compensation for a camera lens using... Method of luminance compensation for a camera lens using...

2009-06-30

2011-10-25

Tran, Sinh (Department: 2622)

Television

Camera, system and detail

Optics

C348S336000, C382S300000

Reexamination Certificate

active

08045039

ABSTRACT:
Provided is a method of luminance compensation for a camera lens by performing a multiline interpolation algorithm. Preferably, a plurality of directional lines are radially arranged on a curved surface of the lens. Sampling dots are then designated along the directional lines in equal or variant distances. Steps including a step of determining the location of a target for luminance compensation, a step of obtaining adjacent directional lines by referring to a slope at the target, a step of calculating the correction values and the weights for interpolation are further introduced. The interpolation algorithm is used to restore a correction plane of a whole image. A polynomial equation is preferably used to obtain two correction values of two directional lines with the same radius. Alternatively, a lookup table is introduced to find the two correction values. It's featured that a symmetric or asymmetric compensation for the camera lens is achieved.

REFERENCES:
patent: 6782143 (2004-08-01), Dube et al.
patent: 7088388 (2006-08-01), MacLean et al.
patent: 7834925 (2010-11-01), Kim

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