Image reader capable of detecting blank documents

Details Image reader capable of detecting blank documents Image reader capable of detecting blank documents

1991-02-26

1992-08-11

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 51, 382 56, 382 63, 358464, G06K 700, G06K 920

Patent

active

051386747

ABSTRACT:
An image reader having blank document detection circuitry for detecting whether the document is blank or not, the detection circuitry comparing the data to a predetermined threshold value by picture elements, counting the number of the data over the predetermined threshold value, and detecting the blank document when the counted number does not exceed a preset number. The control circuitry can discontinue the later image reading operation in response to the detection of the blank document.

REFERENCES:
patent: 3305833 (1967-02-01), Gallien
patent: 4464682 (1984-08-01), Etoh et al.
patent: 4672461 (1987-06-01), Yoshida
patent: 4763200 (1988-08-01), Nakatani et al.
patent: 4839740 (1989-06-01), Yoshida
patent: 4899394 (1990-02-01), Lee

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