Image reader

Details Image reader Image reader

1990-10-10

1992-05-19

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

235436, 358465, 358466, 382 51, 382 53, G06K 938

Patent

active

051154781

ABSTRACT:
A scan apparatus, comprising: a platen on which a document can be placed; a criterion member on which at least one black zone and at least one white zone are formed successively in the subscan direction, criterion member being arranged near the platen on the side from which a subscan is started; a device for detecting a linear optical image of the document to obtain the density distribution of the linear optical image; a device for scanning the criterion member and a document in the subscan direction which includes a device that illuminates a document placed on a document area of the platen and the criterion member; and a device for determining a reference timing for starting a scan of the document on the platen, which is connected to the device that detects a linear optical image so as to detect a boundary between the black and white regions and determine the reference timing from the boundary detected.

REFERENCES:
patent: 4086478 (1978-04-01), Okano
patent: 4357596 (1982-11-01), Feilchenfeld
patent: 4384272 (1983-05-01), Tanaka et al.
patent: 4420742 (1983-12-01), Tadauchi et al.
patent: 4464681 (1984-08-01), Jacobs et al.
patent: 4471386 (1984-09-01), Tuhro
patent: 4517606 (1985-05-01), Yokomizo et al.
patent: 4602291 (1986-07-01), Temes
patent: 4724330 (1988-02-01), Tuhro
patent: 4728984 (1988-03-01), Daniele
patent: 4751376 (1988-06-01), Sugiura et al.

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