Automatic digital black shading for cameras

Details Automatic digital black shading for cameras Automatic digital black shading for cameras

1995-04-11

1996-02-20

Razavi, Michael T.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348251, 348241, 382274, H04N 964, H04N 5217

Patent

active

054933340

ABSTRACT:
A video camera generates an approximation of the dark current or black shading distortion signals based on scan position in the image, and subtracts the approximation signal from the signal generated by the camera during normal image-sensing operation to reduce the black shading distortion. In a particular embodiment of the invention, counters generate location signals representative of the location of pixel currently being read, and the location signals are processed by functions such as squaring or raising to a constant power, and by weighting, to produce components of the approximation of the dark signal. The components are subtracted from the imager signal, to reduce the dark shading. In one embodiment of the invention, the functions are automatically selected from among a plurality of preselected functions, and implemented by look-up tables.

REFERENCES:
patent: 4285004 (1981-08-01), Morrison et al.
patent: 4599640 (1986-07-01), Dischert
patent: 4663666 (1987-05-01), Bloom
patent: 4731652 (1988-03-01), Yamanaka
patent: 4970598 (1990-11-01), Vogel
patent: 5047861 (1991-09-01), Houchin et al.
patent: 5272536 (1993-12-01), Sudo et al.
European Search Report for Application Number 94118480.6 dated Mar. 28, 1995.

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