Block readable video imager having noise compensation

Details Block readable video imager having noise compensation Block readable video imager having noise compensation

1987-03-13

1988-11-15

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821315, H04N 314

Patent

active

047853530

ABSTRACT:
A video imager which is read out in block format is compensated for fixed pattern noise and shading in a single, economical and efficient manner. In block readout, a plurality of rows of photosites are read out of the sensor simultaneously. According to the invention, a single noise compensation data is stored for each column of photosites in a block, thus reducing the number of compensation data which must be stored and consequently, the size of the memory needed. Additionally, a single set of compensation data for a block may be used for multiple frame rates or for several blocks in a frame, thereby further reducing the memory capacity for storing noise compensation data. The invention is useful in fast frame recorders operable at multiple frame rates.

REFERENCES:
patent: 4322752 (1982-03-01), Bixby
patent: 4330796 (1982-05-01), Anagnostopoulos et al.
patent: 4400734 (1983-08-01), Davy
patent: 4589028 (1986-05-01), Ochi
patent: 4679090 (1987-07-01), Erhardt

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