Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1997-02-25
1998-10-20
Le, Que
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502081, 2505594, 382313, 235472, G06K 7015
Patent
active
058250441
ABSTRACT:
A scanning device and method of forming a scanned electronic image include an imaging sensor and at least one navigation sensor. For an embodiment, the imaging sensor enables sensing of color images. In the preferred embodiment, the imaging sensor is a linear array of sensor elements, with a two-dimensional navigation sensor array at each end. The scanning device has three degrees of freedom, since position information from the navigation sensors allows manipulation of an image signal from the imaging sensor to reduce distortion artifacts caused by curvilinear scanning. Acceptable sources of the position information include printed matter and contrast variations dictated by variations in the inherent structure-related properties of the medium on which the scanned image is formed. Inherent structure-related properties can also include color contrast. Illumination for optimal operation of the navigation system may be introduced at a grazing angle in some applications or in the normal to a plane of the original in other applications, but this is not essential.
REFERENCES:
patent: 4847786 (1989-07-01), Wang et al.
patent: 5578813 (1996-11-01), Allen et al.
Allen Ross R.
Beard David
Smith Mark T.
Tullis Barclay J.
Hewlett--Packard Company
Le Que
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