Correcting offset level using a proportional distribution of a d

Details Correcting offset level using a proportional distribution of a d Correcting offset level using a proportional distribution of a d

1997-04-29

1999-08-17

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

H04N 964

Patent

active

059401257

ABSTRACT:
An offset level of a pixel signal outputted from a linear image sensor having a pixel transfer array disposed along a photodetector is corrected by outputting as empty transfer levels signal levels produced from empty pixel transfer array elements when transfer clock pulses are successively applied to the pixel transfer array after one line of pixel signals is transferred from the photodetector through the pixel transfer array. To determine a correcting quantity of a given pixel of a predetermined line, a difference is produced by subtracting an average empty transfer level of a line preceding the predetermined line from an average empty transfer level of the predetermined line. A proportional distribution of the difference from a first pixel to an nth pixel to be corrected with respect all pixels of the predetermined line is determined. The proportional distribution is added to the empty transfer level of the line preceding the predetermined line. Since the average empty transfer levels of the predetermined line and the preceding line are used, the offset level can accurately be corrected.

REFERENCES:
patent: 3904818 (1975-09-01), Kovac
patent: 5181118 (1993-01-01), Kimura
patent: 5272536 (1993-12-01), Sudo et al.
patent: 5376966 (1994-12-01), Takase

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