Image reading apparatus having a function for correcting dark si

Details Image reading apparatus having a function for correcting dark si Image reading apparatus having a function for correcting dark si

1993-09-29

1994-12-27

Mancuso, Joseph

Television

Camera, system and detail

Combined image signal generator and general image signal...

H04N 5335

Patent

active

053769660

ABSTRACT:
An image reading apparatus includes a photoelectric conversion element which has a plurality of cells, the plurality of cells including shielded cells which are optically shielded so that each shielded cell outputs only the dark signal, a dark signal data generating system for generating dark signal data for each cell of the photoelectric conversion element, the dark signal data corresponding to a ratio of an image signal output from each cell under a no-exposure condition to a first reference dark signal which is obtained based on the dark signals output from the shielded cells under the no-exposure condition, a dark signal data memory for storing the dark signal data for each cell, a dark signal component generating system for generating a dark signal component for each cell, the dark signal component corresponding to a product of the dark signal data for each cell multiplied by a second reference dark signal which is obtained based on the dark signals output from the shielded cells under the exposure condition, and a subtracter for subtracting the dark signal component from an image signal obtained for each corresponding cell under the exposure condition.

REFERENCES:
patent: 4293877 (1981-10-01), Tsunekawa et al.
patent: 4484223 (1984-11-01), Tsunekawa
patent: 4630121 (1986-12-01), Suzuki et al.
patent: 5132801 (1992-07-01), Yamano

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