Facsimile and static presentation processing – Facsimile – Picture signal generator
Reexamination Certificate
1998-02-19
2001-09-25
Grant, II, Jerome (Department: 2624)
Facsimile and static presentation processing
Facsimile
Picture signal generator
C358S506000, C358S449000
Reexamination Certificate
active
06295143
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an apparatus and a method for detecting a scanning range when applying the assistant frames with fixed sizes for the flatbed scanners.
2. Description of the Prior Art
For the optics system such as scanners, a tendency has formed gradually from only scan reflective documents to scan transparent documents. In the present days, the flatbed scanners scan transparent documents such as projection drawings or lantern slides by means of additional assistant frames as aided. However, a pre-scan is necessary to obtain the scanning range when applying conventional assistant frames. Unfortunately, this conventional scan method needs a long time interval to perform, and its precision also can not achieve our requirements.
Referring to
FIG. 1A
, wherein a conventional assistant frame
11
is applied in a flatbed scanner for scanning a scanned document
113
(lantern slides or the like) that is placed at the center of the assistant frame
11
. Please note that the conventional assistant frame
11
includes a front mark
111
and a rear mark
112
allocated at the front and rear sides of the scanned document
113
, respectively. The front mark
111
encompasses three transparent marks with upright triangle arrangement, and the rear mark
112
encompasses three transparent marks with downright triangle arrangement. A pre-scan is performed to make sure the shape and position of front mark
111
and rear mark
112
before scanning the scanned document
113
.
FIG. 1B
represents a conventional assistant frame
12
used for scanning multiple transparent documents, and holding holes
123
are further designed for putting in or taking out the transparent documents conveniently. A front mark
121
and a rear mark
122
are also respectively allocated at the front and rear sides of the assistant frame
12
. Similar to the usage of the assistant frame
11
, a pre-scan is also performed to make sure the shape and position of front mark
121
and rear mark
122
before the scanned document
124
is scanned.
Please note that whole the assistant frames described in the FIG.
1
A and
FIG. 1B
must be scanned to obtain marks information at the positions of the front and rear marks when performing the pre-scan. A sequent recognition operation is also required to recognize whether the front and rear marks are scanned and detected. Furthermore, operations for marking the required scanning ranges must be repeatedly performed to each transparent document. It is quiet a troublesome work to repeat the aforementioned operations when many transparent documents need to be scanned. Additional time is thus needed before scanning the scanned documents, and furthermore, the conventional flatbed scanners must waste a long time interval to complete required scan operations. A need has therefore been arisen to disclose an apparatus and a method, in which the time interval of the pre-scan can be reduced when applying the assistant frames in the flatbed scanners.
SUMMARY OF THE INVENTION
Accordingly, the invention discloses an apparatus and a method for detecting the scanning range when applying the assistant frames in the flatbed scanners. Fixed marks allocated at the front side of the assistant frames are used to determine the sizes of the assistant frames. The required scanning ranges can be determined according to the recognized assistant frames obtained from pre-scan. Only the front sides but whole of the assistant frames need to be pre-scanned and thus to reduce the scanning time interval.
REFERENCES:
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patent: 5153737 (1992-10-01), Kobayashi
patent: 5223904 (1993-06-01), Umezawa
patent: 5327259 (1994-07-01), Furusawa
patent: 5519483 (1996-05-01), Kawanishi et al.
patent: 5742855 (1998-04-01), Saito et al.
patent: 5749468 (1998-05-01), Manico
patent: 5778276 (1998-07-01), Hasegawa
patent: 5835201 (1998-11-01), Itano et al.
patent: 5884765 (1999-03-01), Stephenson
Lee Wayne
Liao Flyinga
Tsai Jenn-Tsair
Grant II Jerome
Merchant & Gould P.C.
Mustek Systems Inc.
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