Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2001-04-25
2002-11-05
Pitts, Harold I. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C235S462220
Reexamination Certificate
active
06474554
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to image scanning methods, and more particularly, to an image scanning method that increases the probability of a quality scan.
2. Description of the Prior Art
Please refer to FIG.
1
.
FIG. 1
is a diagram of a prior art scanner
10
. The scanner
10
has a light source
12
for illuminating a document
14
to be scanned, a transparent panel
16
for supporting the document
14
, and a scanning module
18
for scanning light from the document
14
to generate an image signal of the document
14
. When performing a scan, the light source
12
and the scanning module
18
move simultaneously to scan the document
14
.
As shown in
FIG. 1
, the scanning module
18
has a light sensor module
20
for converting light from the light source
12
to digital image signals. The light sensor module
20
has a lens
22
and a charge coupled device (CCD)
24
. Light is directed to the light sensor module
20
by three light guides
26
.
A common problem is scratches or dust on one, or more, of the light guides
26
, which leads to poor scan quality, examples including, but not limited to, shadows or stripes on the output image.
SUMMARY OF THE INVENTION
It is therefore a primary objective of the present invention to provide a method of image scanning that increases the probability of a quality scan.
In a preferred embodiment, the present invention provides a method of image scanning used in a scanner. The scanner comprises a light source for illuminating a document to be scanned, and a scanning module for scanning the document. The scanning module comprises a light sensor module for receiving light from the document and generating an image signal of the document, and a light delivery module for delivering the light to the light sensor module. The light sensor module is capable of moving in a single direction, and it may be positioned on at least a first and second position. The method comprises:
At the first position, using the light source and the scanning module to obtain a first reference image signal by scanning a reference picture;
at the second position, using the light source and the scanning module to obtain a second reference image signal by scanning a reference picture;
according to the first and second reference image signals, positioning the light sensor module on either the first position or the second position; and
scanning the document;
wherein if flawed areas in the first reference image signal are fewer than flawed areas in the second reference image signal, the light sensor module is positioned on the first position to scan the document, and if flawed areas on the second reference image signal are fewer than flawed areas on the first reference image signal, the light sensor module is positioned on the second position to scan the document.
It is an advantage of the present invention that the probability of a quality scan is increased.
These and other objectives and advantages of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
REFERENCES:
patent: 6189793 (2001-02-01), Knowles et al.
patent: 05179581 (1992-12-01), None
Lin Chun-Liang
Tseng Jen-Shou
Hsu Winston
Pitts Harold I.
UMX Data Systems Inc.
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