Back to results
US 5,687,004 AGranted
Apparatus for scanners system having an infrared ray source
AssigneeMust Systems, Inc.
InventorDonald Chen
Life of this patent
Estimating the term…
Abstract
The present invention is an apparatus for scanner system having an infrared ray source, and this scanner system can be utilized in a region where there is lack of visible light. The present invention includes an infrared ray source, a mirror, a lens set, a filter, a charge couple device (CCD), a pro-processing means, an analogue to digital converter, and a post-processing means.
Claims3
An apparatus for an optic scanner having an infrared ray source to scan an image on a document, said apparatus comprising:
- the infrared ray source having a wavelength that is greater than 800 nm for serving as a light source of said scanner to illuminate infrared ray to said document, said infrared ray being reflected against from a surface of said document;
- an image sensor responsive to said reflected infrared ray for generating an image signal;
- focusing means set in said scanner for focusing and guiding said reflected infrared ray to said image sensor:
- a filter set between said document and said image sensor for filtering out a wavelength of said reflected infrared ray that cannot be detected by said image sensor said filter filtering out the wavelength that is less than 800 nm;
- reflecting means for guiding said reflected infrared ray to said focusing means;
- pre-processing means responsive to said image signal for adjusting dc (direct current) gain of said image signal;
- an analogue to digital converter responsive to said adjusted image signal for converting said adjusted image signal to a digital signal;
- and
- post-processing means responsive to said digital signal for generating an image code by processing said digital signal through highlight, shadow, and Gamma correction.
6 more elements
Dependencies are inferred from the claim text.