CN1227998A - Image scanner and correcting method - Google Patents
Image scanner and correcting method Download PDFInfo
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- CN1227998A CN1227998A CN 98100479 CN98100479A CN1227998A CN 1227998 A CN1227998 A CN 1227998A CN 98100479 CN98100479 CN 98100479 CN 98100479 A CN98100479 A CN 98100479A CN 1227998 A CN1227998 A CN 1227998A
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Abstract
An image scanner and its correction method are disclosed. It has a light signal processor and a scan table on which there is a scan beginning point. The first and the second colour block regions are between the start point of light signal processor and scan beginning point. The first and the second critical points are on the boundary between two colour block regions. The distances of two critical points to reference start point of scanning are the first and the second specific length. The coordinate positions of pixel dots for two critical points are found according to colour variation of pixel dots around them. Based on the first specific length, the pixel coordinate position of the first critical point, the second specific length and the pixel coordinate position of the second critical point, the position of refrence start point for scanning, the drift of scanning light trace and the amplification error of light signal processor are obtained.
Description
The present invention is a kind of device of image scanning and bearing calibration.
Image scanner becomes indispensable computer peripheral apparatus gradually, and manufacturer all bets a large amount of manpower and materials and improves its functional characteristic, mainly be how to allow the image capture module of scanner fast and accurately move to the scan start point of scanning document from original position, begin to carry out scanning motion, thereby raising overall scan speed, the common practice have following several mode:
1. utilize Home sensor mode, as shown in Figure 1, be that image capture module 11 is from original position line L (being so-called Homesensor), move the start line M of a known distance D to scanning document, and be used as the horizontal starting point of scanning document with n the pixel (Pixel) of a known charge coupling element (CCD), though this mode can have the advantage that moves to sweep starting point fast, but its composite factor because of the error of every part and assembly error causes preset distance and actual a gap is arranged, and gives to cause to make with use and brings many difficulties.
2, utilize a black reflection zone (No. the 147499th, Taiwan patent announcement), referring to Fig. 2, it utilizes the chequered with black and white edge angle in black reflection district 21 to be used as a reference point P and positions action, after obtaining the location of pixels coordinate of reference point P, move the position of a length-specific Q again to one scan start line R.So can improve the paste exactness (only existing a part to make error with assembling) of location, on one side but it needs a scan edge seek reference point P, so locating speed is slow and can't carry out the chroma-luminance calibration simultaneously and predict actions such as deviation proportion, magnification ratio.
Main purpose of the present invention provides a kind of device of image scanning and bearing calibration with regard to being at deficiency of the prior art, and it can improve the scanning locating speed of image, and accuracy is higher, and error is less.
The object of the present invention is achieved like this: a kind of device of image scanning, and it comprises: light signal processing device, it moves to a direction since an initial position, and acquisition is desired the image of scanning document and transfers digital signal to handle; And, has scan start point on the moving direction that is positioned at light signal processing device on it in order to put the scanning platform of desiring scanning document; The first color lump district is located between the original position and scan start point of light signal processing device, the second color lump district also is located between the original position and scan start point of light signal processing device, the first color lump district and the second color lump district intersection form first critical point and second critical point, the distance of first critical point between the scan reference starting point is first length-specific, the distance of second critical point between the scan reference starting point is second length-specific, when light signal processing device carries out the image capture action, utilize two critical points picture element point chromatic changing value on every side to obtain the pixel position coordinates of two critical points earlier, obtain the position of scan reference starting point again according to the location of pixels coordinate of first length-specific and first critical point, obtain the scanning optical track deflection and the light signal processing device magnification ratio error of light signal processing device according to the location of pixels coordinate of second length-specific and second critical point.
The first color lump district provides light signal processing device to carry out first colour correction in the device of image scanning, and the second color lump district provides light signal processing device to carry out second colour correction.
The first color lump district is a standard white rectangular area in the device of image scanning, the second color lump district is a standard black rectangular area, the first color lump district is surrounded by the second color lump district, and first colour correction action is bright response and the dark colour correction action of responding with second colour correction action.
The first color lump district is a standard black rectangular area in the device of image scanning, the second color lump district is a standard white rectangular area, the first color lump district is surrounded by the second color lump district, and first colour correction action is moved with second colour correction and moved for secretly responding with the colour correction of bright response.
Light signal processing device comprises in the device of image scanning: desire the image of scanning document and transfer the image capture unit that a digital information is handled in order to acquisition; And the drive unit that is connected in image capture unit, carry out the following step in order to drive image capture unit:
A. image capture unit moves first distance to the first color lump district from original position;
B. image capture unit moves, and image capture unit carries out image capture when action, utilizes picture element point chromatic changing value around two critical points to obtain the pixel position coordinates of two critical points:
C. image capture unit scans according to the position that length-specific moves to the scan reference starting point again;
Comprise among the step c of image capture unit:
C1. light signal processing device moves second distance to the second color lump district from boundary line;
C2. light signal processing device moves the position scanning of the 3rd distance to the scan reference starting point again, second distance and the 3rd distance and be the distance of the scan start point and first critical point.
The first color lump district is a standard white rectangular area in the device of image scanning, the second color lump district is a standard black rectangular area, the first color lump district is surrounded by the second color lump district, first colour correction action that the first color lump district provides light signal processing device to carry out bright response in step a, second colour correction action that the second color lump district provides light signal processing device secretly to respond in step c1.
The first color lump district is a standard black rectangular area in the device of image scanning, the second color lump district is a standard white rectangular area, the first color lump district is surrounded by the second color lump district, first colour correction action that the first color lump district provides light signal processing device secretly to respond in step a, second colour correction action that the second color lump district provides light signal processing device to carry out bright response in step c1.
The coordinates of pixels position of obtained two critical points (X1, Y1), (X2, Y2) obtain scanning optical track deflection and magnification ratio error with following formula in the device of image scanning; Scanning optical track deflection m=(Y2-Y1)/(X2-X1), magnification ratio error
, wherein L is the physical length of boundary line.
A kind of image scan bearing calibration of the present invention, it is applied to a device of image scanning, device of image scanning comprises: light signal processing device, and it moves to a direction since an initial position, and acquisition is desired the image of scanning document and transfers digital signal to handle; And, has scan start point on the moving direction that is positioned at light signal processing device on it in order to put the scanning platform of desiring scanning document; The first color lump district is located between the original position and scan start point of light signal processing device, the second color lump district also is located between the original position and scan start point of light signal processing device, the first color lump district and the second color lump district intersection form first critical point and second critical point, the distance of first critical point between the scan reference starting point is first length-specific, the distance of second critical point between the scan reference starting point is second length-specific, and its bearing calibration comprises following steps:
A. light signal processing device moves first distance to the first color lump district from original position;
B. light signal processing device moves, and light signal processing device carries out image capture when action, utilizes picture element point chromatic changing value around two critical points to obtain the pixel position coordinates of two critical points;
C. light signal processing device scans according to the position that length-specific moves to the scan reference starting point again;
D. obtain the scanning optical track deflection and the light signal processing device magnification ratio error of light signal processing device according to the location of pixels coordinate of second length-specific and second critical point.
Comprise among the step c in the image scan bearing calibration:
C1. light signal processing device moves second distance to the second color lump district from boundary line;
C2. light signal processing device moves the position scanning of the 3rd distance to the scan reference starting point again, second distance and the 3rd distance and be the distance of the scan start point and first critical point.
The first color lump district is a standard white rectangular area in the image scan bearing calibration, the second color lump district is a standard black rectangular area, the first color lump district is surrounded by the second color lump district, first colour correction action that the first color lump district provides light signal processing device to carry out bright response in step a, second colour correction action that the second color lump district provides light signal processing device secretly to respond in step c1.
The first color lump district is a standard black rectangular area in the image scan bearing calibration, the second color lump district is a standard white rectangular area, the first color lump district is surrounded by the second color lump district, first colour correction action that the first color lump district provides light signal processing device secretly to respond in step a, second colour correction action that the second color lump district provides light signal processing device to carry out bright response in step c1.
The coordinates of pixels position of obtained two critical points (X1, Y1), (X2, Y2) obtain scanning optical track deflection and magnification ratio error with following formula in the image scan bearing calibration; Scanning optical track deflection m=(Y2-Y1)/(X2-X1), magnification ratio error
, wherein L is the physical length of boundary line.
In sum, the present invention can realize accurately and fast scanning location action, and can carry out the colour correction action in location action simultaneously, obtains significant data data such as scanning optical track deflection, magnification ratio error, has thoroughly improved the shortcoming of commonly using the practice
The present invention is described in further detail below in conjunction with the specific embodiments of accompanying drawing.
Fig. 1 is the schematic diagram of existing image capture module locate mode.
Fig. 2 is the schematic diagram of another kind of existing image capture module locate mode.
Fig. 3 is of the present invention one sharp preferred embodiment organigram.
Each element that is comprised during the present invention is graphic lists as follows:
See also Fig. 3, be the organigram of a preferred embodiment of the present invention, wherein comprise a light signal processing device 31 that is positioned at original position (initial point), it desires the image of scanning document and transfers a numerical data to handle in order to acquisition; Scanning platform 32 is put and is desired scanning documents 33, have on it scan initial line 321, with the printed first color lump district that finishes of standard black and be completed for printing the second color lump district with standard white.
When the user started scanning means and carries out scanning motion, light signal processing device was desired the image of scanning document in order to acquisition and transfers image capture unit 311 that a numerical data handles to drive image capture units via drive unit 312 and carry out the following step 11 comprises:
1, make image capture unit 311 secretly respond colour correction action (general prior art adopts and extinguishes fluorescent tube as response colour correction foundation secretly, but the correction error that the fluorescent tube chroma-luminance that CCD is responded to when extinguishing not is the standard black that presented for the actual scanning image to be produced) to the first color lump district from the initial one first distance Y a (when making, preset) that moves;
2, image capture unit 311 is moved and utilize the variation of picture element point chromatic value to measure to transfer boundary line to, and obtain two-end-point location of pixels coordinate (X1, Y1), (X2, Y2) than standard white by standard black;
3, make image capture unit 311 carry out bright response colour correction action to the second color lump district from the initial second distance Yb of moving (when making, presetting);
4, to scanning start line 321 positions, scan reference starting point S of specified point begins to scan on it to make image capture unit move the 3rd distance Y c (presetting) again when making, wherein Y=d+Yd.
Because the error during assembling, the scanning optical track that causes image capture unit 311 may produce the deflection situation on level land not with respect to scanning start line 321 or produce the error of magnification ratio, so the technology of the present invention can be carried out first joining that horizontal sweep obtained and the location of pixels coordinate (X1 of second joining in image capture unit 311, Y1), (X2, Y2), can use following formula (1), (2) to get oblique degree of deflection and magnification ratio error, and utilize the gained data information to revise.
Scanning optical track deflection m=(Y2-Y1)/(X2-X1) (1)
M promptly represents the deviation proportion of scanning optical track with respect to scanning start line 321.
The magnification ratio error
(2)，
Wherein L is the physical length of two joining distances, with resolution 600DPI (Dot Per Inch, dots per inch), if L is 10 inches long, and magnification ratio is 1 o'clock, its scanning gained pixel number should be 6000 points, if the pixel number of actual scanning gained (x3-x1) is 5700 points, just then its magnification ratio error σ is
1-5700/6000=0.05。
Claims (14)
1, a kind of device of image scanning is characterized in that: light signal processing device, and it moves to a direction since an initial position, and acquisition is desired the image of scanning document and transfers digital signal to handle; And, has scan start point on the moving direction that is positioned at light signal processing device on it in order to put the scanning platform of desiring scanning document; The first color lump district is located between the original position and scan start point of light signal processing device, the second color lump district also is located between the original position and scan start point of light signal processing device, the first color lump district and the second color lump district intersection form first critical point and second critical point, the distance of first critical point between the scan reference starting point is first length-specific, the distance of second critical point between the scan reference starting point is second length-specific, when light signal processing device carries out the image capture action, utilize two critical points picture element point chromatic changing value on every side to obtain the pixel position coordinates of two critical points earlier, obtain the position of scan reference starting point again according to the location of pixels coordinate of first length-specific and first critical point, obtain the scanning optical track deflection and the light signal processing device magnification ratio error of light signal processing device according to the location of pixels coordinate of second length-specific and second critical point.
2, device of image scanning according to claim 1 is characterized in that: the first color lump district provides light signal processing device to carry out first colour correction in the device of image scanning, and the second color lump district provides light signal processing device to carry out second colour correction.
3, device of image scanning according to claim 2, it is characterized in that: the first color lump district is a standard white rectangular area in the device of image scanning, the second color lump district is a standard black rectangular area, the first color lump district is surrounded by the second color lump district, and first colour correction action is bright response and the dark colour correction action of responding with second colour correction action.
4, device of image scanning according to claim 2, it is characterized in that: the first color lump district is a standard black rectangular area in the device of image scanning, the second color lump district is a standard white rectangular area, the first color lump district is surrounded by the second color lump district, and first colour correction action is moved with second colour correction and moved for secretly responding with the colour correction of bright response.
5, device of image scanning according to claim 1, it is characterized in that: light signal processing device comprises in the device of image scanning: desire the image of scanning document and transfer the image capture unit that a digital information is handled in order to acquisition; And the drive unit that is connected in image capture unit, carry out the following step in order to drive image capture unit:
A. image capture unit moves first distance to the first color lump district from original position;
B. image capture unit moves, and image capture unit carries out image capture when action, utilizes picture element point chromatic changing value around two critical points to obtain the pixel position coordinates of two critical points;
C. image capture unit scans according to the position that length-specific moves to the scan reference starting point again;
6, device of image scanning according to claim 5 is characterized in that: comprise among the step c of image capture unit:
C1. light signal processing device moves second distance to the second color lump district from boundary line;
C2. light signal processing device moves the position scanning of the 3rd distance to the scan reference starting point again, second distance and the 3rd distance and be the distance of the scan start point and first critical point.
7, device of image scanning according to claim 6, it is characterized in that: the first color lump district is a standard white rectangular area in the device of image scanning, the second color lump district is a standard black rectangular area, the first color lump district is surrounded by the second color lump district, first colour correction action that the first color lump district provides light signal processing device to carry out bright response in step a, second colour correction action that the second color lump district provides light signal processing device secretly to respond in step c1.
8, device of image scanning according to claim 6, it is characterized in that: the first color lump district is a standard black rectangular area in the device of image scanning, the second color lump district is a standard white rectangular area, the first color lump district is surrounded by the second color lump district, first colour correction action that the first color lump district provides light signal processing device secretly to respond in step a, second colour correction action that the second color lump district provides light signal processing device to carry out bright response in step c1.
9, device of image scanning according to claim 1 is characterized in that: the coordinates of pixels position of obtained two critical points (X1, Y1), (X2, Y2) in the device of image scanning obtain scanning optical track deflection and magnification ratio error with following formula; Scanning optical track deflection m=(Y2-Y1)/(X2-X1), magnification ratio error
/ L, wherein L is the physical length of boundary line.
10, a kind of image scan bearing calibration, it is characterized in that: it is applied to a device of image scanning, device of image scanning comprises: light signal processing device, and it moves to a direction since an initial position, and acquisition is desired the image of scanning document and transfers digital signal to handle; And, has scan start point on the moving direction that is positioned at light signal processing device on it in order to put the scanning platform of desiring scanning document; The first color lump district is located between the original position and scan start point of light signal processing device, the second color lump district also is located between the original position and scan start point of light signal processing device, the first color lump district and the second color lump district intersection form first critical point and second critical point, the distance of first critical point between the scan reference starting point is first length-specific, the distance of second critical point between the scan reference starting point is second length-specific, and its bearing calibration comprises following steps:
A. light signal processing device moves first distance to the first color lump district from original position;
B. light signal processing device moves, and light signal processing device carries out image capture when action, utilizes picture element point chromatic changing value around two critical points to obtain the pixel position coordinates of two critical points;
C. light signal processing device scans according to the position that length-specific moves to the scan reference starting point again;
D. obtain the scanning optical track deflection and the light signal processing device magnification ratio error of light signal processing device according to the location of pixels coordinate of second length-specific and second critical point.
11, image scan bearing calibration according to claim 10 is characterized in that: comprise among the step c in the image scan bearing calibration:
C1. light signal processing device moves second distance to the second color lump district from boundary line;
C2. light signal processing device moves the position scanning of the 3rd distance to the scan reference starting point again, second distance and the 3rd distance and be the distance of the scan start point and first critical point.
12, image scan bearing calibration according to claim 11, it is characterized in that: the first color lump district is a standard white rectangular area in the image scan bearing calibration, the second color lump district is a standard black rectangular area, the first color lump district is surrounded by the second color lump district, first colour correction action that the first color lump district provides light signal processing device to carry out bright response in step a, second colour correction action that the second color lump district provides light signal processing device secretly to respond in step c1.
13, image scan bearing calibration according to claim 11, it is characterized in that: the first color lump district is a standard black rectangular area in the image scan bearing calibration, the second color lump district is a standard white rectangular area, the first color lump district is surrounded by the second color lump district, first colour correction action that the first color lump district provides light signal processing device secretly to respond in step a, second colour correction action that the second color lump district provides light signal processing device to carry out bright response in step c1.
14, image scan bearing calibration according to claim 11, it is characterized in that: the coordinates of pixels position of obtained two critical points (X1, Y1), (X2, Y2) in the image scan bearing calibration obtain scanning optical track deflection and magnification ratio error with following formula; Scanning optical track deflection m=(Y2-Y1)/(X2-X1), magnification ratio error
Wherein L is the physical length of boundary line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981004792A CN1153439C (en) | 1998-03-03 | 1998-03-03 | Image scanner and correcting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981004792A CN1153439C (en) | 1998-03-03 | 1998-03-03 | Image scanner and correcting method |
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| Publication Number | Publication Date |
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| CN1227998A true CN1227998A (en) | 1999-09-08 |
| CN1153439C CN1153439C (en) | 2004-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981004792A Expired - Fee Related CN1153439C (en) | 1998-03-03 | 1998-03-03 | Image scanner and correcting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352259C (en) * | 2004-01-20 | 2007-11-28 | 富士施乐株式会社 | Image processing apparatus, image processing method and program product therefor |
| CN105491264A (en) * | 2014-09-19 | 2016-04-13 | 光宝电子(广州)有限公司 | Image scanning device and positioning method and calibration piece thereof |
-
1998
- 1998-03-03 CN CNB981004792A patent/CN1153439C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352259C (en) * | 2004-01-20 | 2007-11-28 | 富士施乐株式会社 | Image processing apparatus, image processing method and program product therefor |
| CN105491264A (en) * | 2014-09-19 | 2016-04-13 | 光宝电子(广州)有限公司 | Image scanning device and positioning method and calibration piece thereof |
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| Publication number | Publication date |
|---|---|
| CN1153439C (en) | 2004-06-09 |
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