Document reading apparatus employing two subsequent samplings of

Details Document reading apparatus employing two subsequent samplings of Document reading apparatus employing two subsequent samplings of

1994-10-13

1996-06-25

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250205, 358475, 358509, H01L 2700

Patent

active

055302394

ABSTRACT:
A document reading apparatus includes a reference member used for determining the reference gray scale of an image on a document; a fluorescent lamp for illuminating the reference member; an image sensor for receiving light from the fluorescent lamp via the reference member and for converting the received light into an electric signal; a circuit for obtaining the difference between the latest data corresponding to a specified pixel among the output of the image sensor and the data before a predetermined period corresponding to the specified pixel among the output of the image sensor; and a circuit for determining whether or not the read operation of the document should be started by comparing the difference and a predetermined value.

REFERENCES:
patent: 4647981 (1987-03-01), Froelich
patent: 4654723 (1987-03-01), Nagano
patent: 4698669 (1987-10-01), Sekizawa et al.
patent: 4952972 (1990-08-01), Someya
patent: 5146351 (1992-09-01), Maehara
patent: 5206501 (1993-04-01), Sakakibara et al.
patent: 5214518 (1993-05-01), Kato
patent: 5231513 (1993-07-01), Yokobori et al.
patent: 5296944 (1994-03-01), Suzuki et al.
patent: 5402252 (1995-03-01), Kojima

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