Apparatus and method for performing shading correction by multip

Details Apparatus and method for performing shading correction by multip Apparatus and method for performing shading correction by multip

1995-08-15

1998-07-21

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

348241, H04N 314

Patent

active

057841004

ABSTRACT:
Shading correction is achieved with high precision while reducing the amount of data representing a correction factor for shading correction. A correction factor C(x-1) at a pixel address "x-1" is held in a latch circuit. The correction factor C(x-1) is fed to an adding circuit through a changeover switch. A differential correction factor V(x) representing the difference between the correction factor C(x-1) for a pixel addressed by "x-1" and a correction factor C(x) for a pixel addressed by "x" is read out from a differential correction factor memory, and is fed to the adding circuit. The correction factor C(x-1) and the differential correction factor V(x) are added together in the adding circuit, and data obtained by the addition C(x-1)+V(x) is outputted as the correction factor C(x) at a pixel address "x".

REFERENCES:
patent: 4473844 (1984-09-01), Klein
patent: 4979042 (1990-12-01), Vogel
patent: 5001768 (1991-03-01), Mita et al.
patent: 5047861 (1991-09-01), Houchin et al.
patent: 5289286 (1994-02-01), Nakamura et al.

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