CN100387041C - Image scanner and image data compensating method - Google Patents
Image scanner and image data compensating method Download PDFInfo
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- CN100387041C CN100387041C CNB2005101039584A CN200510103958A CN100387041C CN 100387041 C CN100387041 C CN 100387041C CN B2005101039584 A CNB2005101039584 A CN B2005101039584A CN 200510103958 A CN200510103958 A CN 200510103958A CN 100387041 C CN100387041 C CN 100387041C
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- correcting gain
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Abstract
A method for compensating image data by utilizing image scanner applies image compensation gain on x shaft and Y shaft of scanner to carry out compensation operation in order to shorten time required in data compensation for realizing effect of avoiding initialization-calibration and warming up process of machine.
Description
Technical field
The present invention relates to a kind of image reading apparatus and image data compensating method, particularly a kind of image reading apparatus and image data compensating method that uses X-axis correcting gain and Y-axis correcting gain to compensate simultaneously.
Background technology
Image reading apparatus is very general office and home-use equipment, is used for producing file or photo, the DID of egative film etc.
Because therefore fabrication error, the lighting tube brightness inhomogeneous (the brightness ratio fluorescent tube central brightness that is fluorescent tube two ends is low) of the imageing sensor of image reading apparatus and warm-up period or the like factor need carry out the compensation of view data.The view data relevant with the present invention compensation comprises two kinds, and first kind of initialization that is scanner is carried out when being activated proofreaied and correct, and second kind then is the image compensation of exempting from warming-up, is described as follows.
Known initial calibration method is to finish by scanning one white substrate.Please refer to Fig. 1, it is the employed white substrate schematic diagram of known initial calibration.This white substrate 100 is strips, is attached in the scanner in order to a side of the scanning platform 1000 of placing scanned document and vertical with the direction A that scans, and just is attached to the X-direction of scanning platform.
After the user imports correction instruction, the transducer of scanner can scan white substrate 100 after lighting tube brightness is stable, control program in the scanner can carry out computing according to the view data of white substrate, so that obtain the X-axis correcting gain (gain) and the deviant (offset) of view data compensation usefulness.
This X-axis correcting gain is stored in " shadow compensation table (the shading table) " in the scanner, and scanned view data is multiplied by this X-axis correcting gain and adds this deviant and obtain compensation.
The view data compensation of another scanner then is to shorten the error that the scanner warm-up period is produced in order to compensate.
Please refer to Fig. 2, it is schemed over time for lighting tube brightness.A period of time t of the brightness of fluorescent tube after scanner starts just can arrive stable status, and time t just is called warm-up period.Just scanned before lighting tube brightness is unstable as yet and can cause the error that is scanned view data, therefore most scanner is all needing could to begin to carry out scan operation after warming-up is finished by the time after the startup.
Between 30 seconds-90 seconds, for the user, such stand-by period is to make us unacceptable to the warm-up period of at present general scanner greatly.Especially the function that present multifunctional paper feeding machine all has scanning and xeroxs, under needs warming-up ability scan condition, the user presses and xeroxs the data that just can obtain photomechanical printing afterwards after key also need wait a period of time, and such stand-by period can not meet the user fully to xeroxing the requirement of efficient.
In order to reach the purpose of exempting from warming-up scanning, known have many methods to be suggested, and a kind of mode wherein is not reach under the stable state situation at lighting tube brightness promptly to scan, and the view data that is scanned is compensated afterwards again.For example the applicant promptly discloses a kind of image reading apparatus in No. 93139951 application for a patent for invention of TaiWan, China " compensation method of digital image data " of on December 22nd, 93 application and exempts from the image data compensating method that warming-up is used.
Yet, in order to finish the compensation of X-axis and Y-axis, need carry out the second compensation computing to the view data of same scan line, therefore can increase the time of system handles view data inevitably.
Therefore need a kind of image compensation method that can shorten the view data compensation deals time.
Summary of the invention
Purpose of the present invention is providing a kind of image reading apparatus and image data compensating method, and the gain that comprises the image compensation of the X-axis of scanner and Y-axis by use compensates computing to view data, so that shorten the required time of compensation data.
The invention provides a kind of image reading apparatus in order to produce a scanned view data, comprising:
One fluorescent tube shines a scanned light source in order to produce;
One transducer is in order to produce the analog signal of this scanned image;
One analog front-end device is the numerical data of image in order to the analog signal conversion with this image;
One gain computing module, in order to:
Produce an X-axis correcting gain value, in order to the error of compensation because of the inhomogeneous view data that produces of this lighting tube brightness;
Produce a Y-axis correcting gain value, do not reach the error of the view data that stable state produces in order to compensation because of the brightness of this fluorescent tube; And
Produce an X-Y axle correcting gain value by this X-axis correcting gain value and this Y-axis correcting gain value; And
One control and digital operation unit compensates the numerical data of this image in order to use this X-Y axle correcting gain value.
Be preferably, this gain computing module is a program.
In one embodiment, whether this X-axis correcting gain: it is stable (a) to detect this lighting tube brightness if obtaining by following steps; (b) under the stable situation of this lighting tube brightness, use this fluorescent tube to scan X-axis white substrate; (c) the image brightness data that obtained according to this X-axis white substrate of scanning obtain this X-axis correcting gain value.This Y-axis correcting gain obtains by following steps: the mean value of image brightness data that (a) calculates the multi-strip scanning line of this Y-axis white substrate; (b) obtain a Y-axis correcting gain DY according to the mean value DN of the image brightness data of the multi-strip scanning line of a target brightness value DT and this Y-axis white substrate, wherein DN * DY=DT.
The present invention also provides a kind of image data compensating method of image reading apparatus, this image reading apparatus comprises that a shadow compensation table is in order to write down an X-axis correcting gain, this X-axis correcting gain is in order to the error of compensation because of the inhomogeneous view data that produces of lighting tube brightness of this scanner, and this method comprises: obtain a Y-axis correcting gain according to the mean value of the image brightness data of the multi-strip scanning line of Y-axis white substrate and a target brightness value; According to this X-axis correcting gain and this Y-axis correcting gain and obtain an X-Y axle correcting gain; This X-Y axle correcting gain is recorded in this shadow compensation table; Compensate the view data of this this scanned multi-strip scanning line with this X-Y axle correcting gain.
A kind of image data compensating method of image reading apparatus according to the present invention, this image reading apparatus comprises a fluorescent tube, comprising following steps:
Produce an X-axis correcting gain value, in order to the error that brightness irregularities produced of compensation because of this fluorescent tube;
Produce a Y-axis correcting gain value, do not reach the error that stable state produces in order to the brightness that compensates because of this fluorescent tube; And
Produce an X-Y axle correcting gain by this X-axis correcting gain and this Y-axis correcting gain; And use this X-Y axle correcting gain that the numerical data of one scanned image is compensated.
According to the image data compensating method of image reading apparatus of the present invention, wherein this method is performed by a program.
According to the image data compensating method of image reading apparatus of the present invention, wherein this X-axis correcting gain obtains by following steps:
Whether (a) detect this lighting tube brightness stablizes;
(b) under the stable situation of this lighting tube brightness, use this fluorescent tube to scan X-axis white substrate;
(c) obtain this X-axis correcting gain according to the scanning image brightness data that this white substrate obtained.
Image data compensating method according to image reading apparatus of the present invention, wherein this Y-axis correcting gain obtains a Y-axis correcting gain DY according to the mean value DN of the image brightness data of a plurality of scan lines of a target brightness value DT and this Y-axis white substrate, wherein DN * DY=DT.
Description of drawings
Fig. 1 is the white substrate schematic diagram that the initial calibration on the glass platform of known image reading apparatus is used.
Fig. 2 is the curve chart of lighting tube brightness and time.
Fig. 3 is a preferred embodiment block schematic diagram of image reading apparatus of the present invention.
Fig. 4 is the X-axis white substrate and the white substrate schematic diagram of Y-axis on the glass platform of image reading apparatus of the present invention.
Wherein, description of reference numerals is as follows:
1000 scanning glasses, 100 white substrate 300 image reading apparatus
301 imageing sensors, 302 fluorescent tubes, 303 analog front-end devices
304 flash memories, 3041 shadow compensation table 305 internal memories
306 gain computing modules, 307 control and digital operation unit 400 glass platform
401X axle white substrate 402Y axle white substrate
Embodiment
Please refer to Fig. 3, it is the block schematic diagram of a preferred embodiment of image reading apparatus of the present invention.Be noted that Fig. 3 only represents and the relevant part of embodiment of the invention explanation, does not express all building blocks of known image reading apparatus.
Fig. 3 has represented that image reading apparatus 300 of the present invention comprises that a transducer 301 is scanned in order to produce, analog signal as the image of file or photo or the like, one fluorescent tube 302 shines a scanned light source in order to produce, one analog front-end device 303 is the numerical data of image in order to the analog signal conversion with this image, one flash memory 304 is in order to store a shadow compensation table 3041 (shading table), one gain computing module 306, it is a program, be arranged at internal memory, within SDRAM 305, compensate the error that is produced because of fluorescent tube 302 brightness irregularities in order to produce an X-axis correcting gain value, produce a Y-axis correcting gain value, do not reach the error that stable state produces in order to the brightness that compensates because of fluorescent tube 302, and produce an X-Y axle correcting gain by this X-axis correcting gain and this Y-axis correcting gain, and one control and digital operation unit 307, in order to according to the gain computing module 306 contents of program use this X-Y axle correcting gain that the numerical data of this image is compensated.
Please refer to Fig. 4, it is the schematic diagram of white substrate of the X-axis on the scanning platform of the present invention and Y-axis white substrate.X-axis white substrate 401 is attached at the X-direction of scanning platform 400, and Y-axis white substrate 402 is attached at the Y direction of scanning platform 400.Wherein X-axis is vertical with Y-axis, and scanning direction A is parallel with Y-axis.Fig. 4 has also represented scan line L1-L2N, and wherein L1 is the 1st a scanned scan line, and LN is scanned N bar scan line, and L2N is scanned 2N bar scan line.
The flow process of image compensation method of the present invention below is described, following flow process is to be carried out according to the contents of program of gain computing modules 306 by control and digital operation unit 307:
Produce the X-axis correcting gain
Whether the brightness that a. detects fluorescent tube 302 has reached stable state.
B. after having reached stable state, the brightness of fluorescent tube 302 makes transducer 301 scanning X-axis white substrates 401.
C. the view data that is obtained by scanning X-axis white substrate 401 is carried out computing to obtain an X-axis correcting gain GX.
D. this X-axis correcting gain GX is write in the shadow compensation table 3041.
Because producing the operation method of X-axis correcting gain is known technology, so be not described in detail in this.
The X-axis correcting gain of known scanner all is to be carried out voluntarily before using scanner by the user.The present invention then advise the X-axis correcting gain generation can scanner is manufactured finish after, by production operation person for it, make scanner when being sold, have the X-axis correcting gain in its shadow compensation table.Such mode can allow the user can carry out the initial calibration program again after starting scanner.
Produce Y-axis correcting gain and X-Y axle correcting gain
A. receive the image brightness data of the 1-N bar scan line L1-LN of Y-axis white substrate 402 and scanned image, wherein N is for a plurality of arbitrarily, and for example 16 or 32 or other numerical value.
B. calculate the mean value D of image brightness data of the 1-N bar scan line L1-LN of Y-axis white substrate 402
L1-LN
C. according to D
L1-LNCarry out computing to obtain one first Y-axis correcting gain value GY1 with a target brightness value DT who is stored in advance in the scanner; Target brightness value DT is the brightness value of transducer in following due Y-axis white substrate of the fixed state of lighting tube brightness.Wherein:
D
L1-LN×GY1＝DT
D. X-axis correcting gain GX and one first Y-axis correcting gain GY1 are multiplied each other and obtain one the one X-Y axle correcting gain GXY1.
E. replace the interior X-axis correcting gain GX of shadow compensation table 3041 with an X-Y axle correcting gain GXY1.
F. with an X-Y axle correcting gain GXY1 DID of scanned L1-LN bar scan line is compensated.
G. receive N bar scan line, just N+1-2N bar scan line LN+1-L under Y-axis white substrate 402 and the scanned image
2The DID of N.
H. calculate the N+1-2N bar scan line LN+1-L of Y-axis white substrate 402
2The mean value D of the image brightness data of N
LN+1-L2N
I. according to D
LN+1-L2NDT goes forward side by side row operation and obtains one second Y-axis correcting gain value GY2 with this target brightness value.Just,
D
LN+1-L2N×GY2＝DT
J. an X-Y axle correcting gain GXY1 and the second Y-axis correcting gain value GY2 are multiplied each other and obtain one the 2nd X-Y axle correcting gain value GXY2.
K. replace the interior X-Y axle correcting gain GXY1 of shadow compensation table 3041 with the 2nd X-Y axle correcting gain value GXY2.
L. with the 2nd X-Y axle correcting gain value GXY2 the DID of scanned LN+1-L2N bar scan line is compensated.
M. repeating step g-l.
Can understand by above explanation, the present invention is combined into the correcting gain of X-axis and the correcting gain of Y-axis an XY axle correcting gain value and writes known only in order in the shadow compensation table that stores X-axis correcting gain value by the gain computing module of implementing with program, therefore only need scanned view data is carried out once gain compensation computing, just compensate computing with XY axle correcting gain value, promptly can reach compensation, save the required time of view data compensation in X-axis (initial calibration) and Y-axis (exempting from warming-up).
Above embodiment only is explanation the present invention's usefulness, and other modification of being made under not breaking away from mental condition of the present invention all should be considered as falling in the scope of claims of the present invention.
Claims (9)
1. image reading apparatus in order to produce a scanned view data, comprising:
One fluorescent tube shines a scanned light source in order to produce;
One transducer is in order to produce the analog signal of this scanned image;
One analog front-end device is the numerical data of image in order to the analog signal conversion with this image; It is characterized in that, also comprise:
One gain computing module, in order to:
Produce an X-axis correcting gain, in order to the error of compensation because of the inhomogeneous view data that produces of this lighting tube brightness;
Produce a Y-axis correcting gain, do not reach the error of the view data that stable state produces in order to compensation because of the brightness of this fluorescent tube; And
Produce an X-Y axle correcting gain by this X-axis correcting gain and this Y-axis correcting gain; And
One control and digital operation unit compensates the numerical data of this image in order to use this X-Y axle correcting gain.
2. image reading apparatus as claimed in claim 1 is characterized in that, this gain computing module is a program.
3. image reading apparatus as claimed in claim 1 is characterized in that, this X-axis correcting gain obtains by following steps:
Whether (a) detect this lighting tube brightness stablizes;
(b) under the stable situation of this lighting tube brightness, use this fluorescent tube to scan X-axis white substrate;
(c) the image brightness data that obtained according to this X-axis white substrate of scanning obtain this X-axis correcting gain.
4. image reading apparatus as claimed in claim 1 is characterized in that, this Y-axis correcting gain obtains by following steps:
(a) calculate the mean value of image brightness data of the multi-strip scanning line of this Y-axis white substrate;
(b) obtain a Y-axis correcting gain DY according to the mean value DN of the image brightness data of the multi-strip scanning line of a target brightness value DT and this Y-axis white substrate, wherein DN * DY=DT.
5. the image data compensating method of an image reading apparatus, this image reading apparatus comprises that a shadow compensation table is in order to write down an X-axis correcting gain, in order to the error of compensation, it is characterized in that this method comprises because of the inhomogeneous view data that produces of lighting tube brightness of this scanner:
Obtain a Y-axis correcting gain according to the mean value of the image brightness data of the multi-strip scanning line of Y-axis white substrate and a target brightness value;
According to this X-axis correcting gain and this Y-axis correcting gain and obtain an X-Y axle correcting gain;
This X-Y axle correcting gain is recorded in this shadow compensation table;
Compensate the view data of this this scanned multi-strip scanning line with this X-Y axle correcting gain.
6. the image data compensating method of an image reading apparatus, this image reading apparatus comprises a fluorescent tube, it is characterized in that, may further comprise the steps:
Produce an X-axis correcting gain value, in order to the error that brightness irregularities produced of compensation because of this fluorescent tube;
Produce a Y-axis correcting gain value, do not reach the error that stable state produces in order to the brightness that compensates because of this fluorescent tube; And
Produce an X-Y axle correcting gain by this X-axis correcting gain and this Y-axis correcting gain; And
Use this X-Y axle correcting gain that the numerical data of one scanned image is compensated.
7. the image data compensating method of image reading apparatus as claimed in claim 6 is characterized in that, this method is performed by a program.
8. the image data compensating method of image reading apparatus as claimed in claim 7 is characterized in that, this X-axis correcting gain obtains by following steps:
Whether (a) detect this lighting tube brightness stablizes;
(b) under the stable situation of this lighting tube brightness, use this fluorescent tube to scan X-axis white substrate;
(c) obtain this X-axis correcting gain according to the scanning image brightness data that this white substrate obtained.
9. the image data compensating method of image reading apparatus as claimed in claim 7, it is characterized in that, this Y-axis correcting gain obtains a Y-axis correcting gain DY according to the mean value DN of the image brightness data of the multi-strip scanning line of a target brightness value DT and this Y-axis white substrate, wherein DN * DY=DT.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101039584A CN100387041C (en) | 2005-09-16 | 2005-09-16 | Image scanner and image data compensating method |
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| CNB2005101039584A CN100387041C (en) | 2005-09-16 | 2005-09-16 | Image scanner and image data compensating method |
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| CN100387041C true CN100387041C (en) | 2008-05-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102104707B (en) * | 2009-12-22 | 2013-04-17 | 东友科技股份有限公司 | Contact type image scanning device and scanning control method of same |
| CN103856682B (en) * | 2012-11-30 | 2016-07-13 | 崴强科技股份有限公司 | Image correcting method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06202023A (en) * | 1992-07-09 | 1994-07-22 | General Scanning Inc | Scanning microscope using improved scanning mechanism |
| CN2291673Y (en) * | 1997-03-25 | 1998-09-16 | 中国科学院长春光学精密机械研究所 | Wedge compensating optical scanning rotating scope |
| JP2004226499A (en) * | 2003-01-20 | 2004-08-12 | Hitachi Via Mechanics Ltd | Scanner device and laser machining device |
-
2005
- 2005-09-16 CN CNB2005101039584A patent/CN100387041C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06202023A (en) * | 1992-07-09 | 1994-07-22 | General Scanning Inc | Scanning microscope using improved scanning mechanism |
| CN2291673Y (en) * | 1997-03-25 | 1998-09-16 | 中国科学院长春光学精密机械研究所 | Wedge compensating optical scanning rotating scope |
| JP2004226499A (en) * | 2003-01-20 | 2004-08-12 | Hitachi Via Mechanics Ltd | Scanner device and laser machining device |
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