Freehand image scanning device which compensates for non-linear

Details Freehand image scanning device which compensates for non-linear Freehand image scanning device which compensates for non-linear

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.

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