Facsimile and static presentation processing – Natural color facsimile – Scanning
Reexamination Certificate
1999-05-03
2002-07-09
Lee, Cheukfan (Department: 2722)
Facsimile and static presentation processing
Natural color facsimile
Scanning
C358S504000
Reexamination Certificate
active
06417938
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a color image scanner, and more particularly, to a color image scanning method of a color image scanner.
2. Description of the Prior Art
Please refer to FIG.
1
.
FIG. 1
is a perspective view of image scanning lines
16
,
18
of a document
10
. The scanning module
12
comprises a plurality of light sensors
14
arranged in a linear manner that are used to scan a document
10
. The scanning module
12
scans the document
10
to sequentially produce image scanning lines
16
,
18
. In this way, a document image is formed. Each scanning line
16
,
18
comprises a plurality of scanning dots that correspond to the output of the sensors
14
. The inset denoted by a dotted square
30
shows an enlarged view of scanning lines
16
,
18
. The square
30
indicates that each scanning line
16
,
18
has red image, green image, and blue image lines
22
,
24
, and
26
. Although each of these image lines is close to each other, they are not precisely coincident. This is because the scanning module
12
advances at a constant speed and motion as it takes samples. This results in varying positions of each sample. The result is that each scanning point
20
of the scanning line
16
in effect comprises red, green and blue scanning points
32
,
34
, and
36
. The samples are taken at a much faster speed than the movement of the sensors
14
. Therefore, the red, green, and blue scanning points
32
,
34
,
36
are very close together and are viewed as a scanning point
20
thus forming the image of the scanned document.
Please refer to FIG.
2
.
FIG. 2
is a schematic diagram of intensity and time-sequence of three light sources
42
,
44
,
46
of a prior art color scanner. In the prior art the image line of each color is obtained by using the light source of that color. For example, to obtain an image scanning line, the red, green, and blue light sources
42
,
44
, and
46
are turned on sequentially to produce their respective image lines
22
,
24
,
26
in sequence. The scanning module
12
is then further driven to complete the scanning of the document
10
. There are many methods to calibrate the image scanning line. The first method is to calibrate the image lines
22
,
24
,
26
before the composed image scanning line is outputted. The second method is to adjust intensities or turn-on periods of the three light sources
42
,
44
,
46
before scanning is performed. These methods only utilize the light source
42
,
44
,
46
of each color to obtain the respective image line
22
,
24
,
26
.
SUMMARY OF THE INVENTION
It is therefore a primary objective of the present invention to provide a color image scanning method of a color image scanner to solve the above mentioned problems.
In a preferred embodiment, the present invention provides a color image scanning method of a color image scanner, the scanner comprising three light sources for emitting three different colored lights to illuminate a document to be scanned, and a scanning module for scanning the lights transmitted from the document to generate scanned color image signals of the document, the method comprising:
(1) using each of the three light sources and the scanning module to scan a color calibration document to obtain three sets of scanned color image signals of the color calibration document, where three sets of final color image signals of the color calibration document are known;
(2) using the three sets of scanned color image signals and final color image signals of the color calibration document to calculate three sets of color calibration parameters for calibrating the three light sources, each set of color calibration parameters comprising three color calibration parameters for calibrating the three light sources to obtain one set of final color image signals; and
(3) using each of the three sets of color calibration parameters to adjust the three light sources when scanning the document so as to obtain three sets of final color image signals of the document.
It is an advantage of the present invention that the scanning module scans the document using three light sources while also using calibrating parameters to obtain image scanning lines. Finally, the final scanning image is obtained by combining the image scanning lines.
This and other objectives 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 which is illustrated in the various figures and drawings.
REFERENCES:
patent: 5696608 (1997-12-01), Matsuo et al.
patent: 5721623 (1998-02-01), Boxma
patent: 5745262 (1998-04-01), Tatsumi
patent: 6011906 (2000-01-01), Muroki et al.
patent: 6118557 (2000-09-01), Sugiyama et al.
patent: 6172771 (2001-01-01), Ikeda et al.
patent: 6222934 (2001-04-01), Tsai
patent: 6275309 (2001-08-01), Hu et al.
patent: 6320668 (2001-11-01), Klm
Hsu Chuan-Yu
Lee Chen-Ho
Hsu Winston
Lee Cheukfan
UMX Data Systems Inc.
LandOfFree
Color image scanning method of a color image scanner does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Color image scanning method of a color image scanner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color image scanning method of a color image scanner will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2887855