CN1264330C - Closed-loop controller and control method for improving the scanning quality of gimbal scanner - Google Patents
Closed-loop controller and control method for improving the scanning quality of gimbal scanner Download PDFInfo
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- CN1264330C CN1264330C CN 98103424 CN98103424A CN1264330C CN 1264330 C CN1264330 C CN 1264330C CN 98103424 CN98103424 CN 98103424 CN 98103424 A CN98103424 A CN 98103424A CN 1264330 C CN1264330 C CN 1264330C
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Abstract
The present invention relates to a device and a method thereof for improving the scanning quality of a flatted scanner by using closed-loop control. An optical ruler is arranged along the scanning direction of an image sensor as the calibration reference for adjusting the shift step number, and each optical ruler is coated with line pair patterns formed by black and white square blocks which are interlaced and have the same width. When a scanning sensor starts scanning, a calibration image including a plurality of staggered black and white mapping points is obtained, and by calculating the number of the black and white mapping points and the pixel position to which the gray scale number of the calibration image is corresponding, the actual shift distance of the image sensor can be easily obtained. The shift distance can be converted into the shift step number of the image sensor, and if the shift step number is less than required, the image sensor is driven to scan again, so that the accuracy and the quality of scanned images are improved.
Description
The present invention relates to a kind of device and a kind of method, be used to increase the scanning accuracy and the quality of platform-type scanner, particularly utilize a stepping motor to increase the device and method that scans accuracy and quality with closed-loop control technology.
The progress of science causes many scanners to be manufactured for reaching different types of demand significantly.All reflectivity files (for example paper and business card) and penetrability file (for example transparency or lantern slide) all can be used different scanner scans, and its scan image can be stored and further processes.Scanner can be classified as platform-type scanner (flatbedscanner) traditionally, and photorepeate equally places all desire scanning documents on its transparency window and carries out scanning, and the feed-in type scanner will be desired in the scanning document feed-in scanner to produce scan image.Recently, it is littler than in the past that scanner is made, be used to reach will sweep the purpose that is built in the device in the computer chassis, though size was little for the in-building type scanner more in the past, however the existing trend that becomes the standard configuration of PC of in-building type scanner.
In above-mentioned, be built in the computer chassis demand, scanner also need have higher resolution in order to produce the more comfortable scan image of human vision, for example, resolution now just increases to 600dPi or higher by 300dpi (counting for every cun).In the prior art, stepping motor (step motor) is generally used in the scanner as driving figure image sensor (imagesensor), because open-loop control (open loop control) can reach the mobile step number of control chart image sensor easily, for example, stepping motor can drive a contact-type figure image sensor (Contact Image Sensor, CIS) motion scan length by length according to the size of desiring scanning document.Usually, stepping motor is very significant to the influence of the quality of scan image, because when stepping motor meeting nature generation resonance frequency when the slow-speed of revolution (common 150 to 250PPS (per second pulses)) moves down, and stepping motor is usually because of moving the generation that causes noise length by length.In addition, the actual mobile step number of uncontrollable figure image sensor is controlled in open loop, because do not have feedback information in order to confirm actual mobile step number.The technology that another kind is used to control mobile step number is to use a closed-loop control (close loop control), its present address that utilizes extra address sensor (address sensor) feedback image sensor is as adjustment, therefore need the present address of encoder reception, and convert thereof into the correct mobile of figure image sensor from the address sensitive device.In addition, extra encoder also needs additional circuit, also will increase the cost of scanner significantly, therefore needs a kind of device, and wherein all above-mentioned shortcomings all can be overcome to increase the scanning accuracy and the quality of platform-type scanner.
The purpose of this suction provides a kind of defective that overcomes prior art, utilizes closed-loop control to increase the device and method of platform-type scanner scans precision and quality.
Device of the present invention is achieved in that it includes at least: an optics chi (optical ruler) has several staggered lines to pattern (line-pair patterns); Image forming appts scans this optics chi to produce several calibration chart pictures, reaches the scan image that scanning one scanned document produces a scanned document; And drive unit, import this calibration chart picture, when this calibration chart looks like to point out that this scan image need rescan, drive this image forming appts and produce this scan image once more.
Wherein above-mentioned calibration chart similarly is to be used for carrying out an image compensation to repair above-mentioned scan image.
Wherein above-mentioned line comprises staggered black square and white square to pattern.
Wherein above-mentioned black square width and above-mentioned white square width have identical size.
Wherein above-mentioned image forming appts comprises a figure image sensor at least.
Wherein above-mentioned drive unit comprises a stepping motor (Step motor) at least.
Method of the present invention is achieved in that this method comprises step at least: produce a calibration chart picture; Produce the one scan image of this scanning document; Utilize this calibration chart to look like to obtain generation place that goes offline of this scan image; Utilize this figure image sensor of driving and obtain actual mobile step number; And be lower than and move predetermined critical when the mobile step number of this reality, maybe when this total quantity that goes offline is higher than the quantity predetermined critical, produce this scan image of this desire scanning document again.
Wherein above-mentioned calibration chart similarly is to be obtained by scanning one optics chi.
Wherein utilize above-mentioned calibration chart to look like to be used to carry out an image compensation to repair above-mentioned scan image.
Wherein above-mentioned optics chi comprises staggered line to pattern (line pair patterns).
Wherein above-mentioned staggered line comprises staggered black square and white square to pattern.
Wherein above-mentioned black square width and above-mentioned white square width have identical size.
Wherein above-mentioned platform-type scanner comprises several above-mentioned optics chis.
This method comprises step at least: utilize scanning one optics chi to produce the one scan image, this optics chi comprises staggered black square and white square; Produce the one scan image of scanned document; Utilize this calibration chart to look like to obtain generation place that goes offline of this scan image; Utilize this calibration chart to look like to carry out an image compensation and repair this scan image; Utilize this calibration chart to look like to produce a displacement; Utilize this displacement to drive this figure image sensor and obtain actual mobile step number; And, when being lower than, the mobile step number of this reality moves predetermined critical, maybe when this total quantity that goes offline is higher than a quantity predetermined critical, produce the scan image of this desire scanning document again.
Wherein above-mentioned optics chi relies on the transparency window of above-mentioned platform-type scanner to settle.
Wherein above-mentioned black square width and above-mentioned white square width have identical size.
Wherein above-mentioned platform-type scanner comprises several above-mentioned optics chis.
Wherein each above-mentioned optics chi is used for a predetermined scanning resolution.
The present invention utilizes technology of closed loop to increase the device and method of scanning accuracy and quality, the optics chi is settled as the calibration reference of adjusting mobile step number along the scanning direction of figure image sensor, each optics chi scribbles line that the black and white square interweaves to pattern, and black and white square are designed to identical width.When the scanning sensor begins scanning, obtain comprising the black that several are staggered and the calibration chart picture of white photosites, nationality is by the quantity of calculating black and white reflection, and the pairing location of pixels of grey in the calibration chart picture, can obtain the actual displacement of figure image sensor easily, displacement can be converted into the mobile step number of figure image sensor, if mobile step number is than the lacking of demand, then the figure image sensor will be driven once more scan image to improve the accuracy and the quality of scan image.
Below in conjunction with description of drawings characteristics of the present invention.
Fig. 1 illustrates that an optics chi is applied to structure chart of the present invention;
Fig. 2 explanation is perpendicular to the sweep limits schematic diagram of the purpose direction of scanning direction;
Fig. 3 describes the schematic diagram that an oscillogram is parallel to the purpose direction of scanning direction;
Fig. 1 illustrates that figure representative ought be applied to one scan device 101 by an optics chi 103, one desires scanning document places transparency window 102 upper ends, and the desire scan page of scanning document is towards transparency window 102, scanning document is according to scanning direction 104 scannings, and black square 105 and white square 106 are plotted in optics chi 103 alternately.Please note that black square 105 and white square 106 are designed to have same widths in this preferred embodiment.In addition, the optics chi relies on transparency window 102 to place, and will can not appear at the scan image of desiring scanning document but drive the calibration chart picture by optics chi 103, so the width of figure image sensor must be greater than the width of transparency window 102.See also Fig. 2, wherein describe the relation between the above-mentioned width, the width 201 obvious width 203 of figure image sensor among Fig. 2 greater than transparency window 102, yet, one figure image sensor 202 (for example contact-type figure image sensor (ClS) or electric coupling device (Charge, Coupled Device CCD) all can be used for receiving the light beam that come by scanned document and optics.
To comprise staggered black and white photosites by optics chi 103 scan image that obtains, for example, Fig. 3 describes staggered black and white photosites (representing with Po and Pw respectively) the calibration chart picture via scanning optical chi 103, the length of scan image increases along the scanning direction among Fig. 3, significantly, scan image can be applied to the mobile step number of computed image sensor among Fig. 3, because the quantity of black and white photosites can be converted into the mobile step number of the reality of figure image sensor, so actual mobile step number can move step number relatively with demand, obtain actual mobile step number by feedback displacement, a closed-loop control is so far finished.
In addition, when the mobile step number of reality and demand moved that difference is greater than a predetermined critical between the step number, scan operation must re-execute.Traditionally, scanner comprises the scan-data that some holders are used for storing scan image, then when memory is almost saturated, again with one group one group ground output of scan-data.Because will making, the output of scan-data sweeps the temporary transient interruption of operation, yet stepping motor still continues to drive figure image sensor motion scan, so having some scanning lines misses during the output scanning data, above-mentioned shortcoming will influence the quality of scan image significantly, the spy is today of demand high-res, and expression needs the transmission of more memory and more data than in the past.Utilize technology of the present invention, mobile step number can obtain easily, and in addition, but part does not appear in calibration chart picture reading scan lines, and image compensation is optionally carried out the place of missing at the scanning lines, to repair scan image; Perhaps when being higher than predetermined critical, scanning lines leakage sum re-executes scan operation.Moreover, can put the optics chi that several have different resolutions on the transparency window limit, in different scanning resolutions, to do the usefulness of calibration.
In a word, the present invention is a kind of device and a kind of method, in order to increase scanning accuracy and quality, use a closed-loop control and obtain actual mobile step number by the displacement of feedback image sensor, when the actual number of moving one's steps is lower than a predetermined critical, then can determine to carry out scan operation, the accuracy of scan image and quality do not need extra circuit and encoder to improve again.
Claims (11)
1, a kind of device that utilizes closed-loop control to increase platform-type scanner scans quality, it is characterized in that: it includes at least: an optics chi has several staggered lines to pattern; Image forming appts scans this optics chi to produce several calibration chart pictures, reaches the scan image that scanning one scanned document produces a scanned document; And drive unit, import this calibration chart picture, when this calibration chart looks like to point out that this scan image need rescan, drive this image forming appts and produce this scan image once more; Above-mentioned line comprises staggered black square and white square to pattern, and above-mentioned black square width and above-mentioned white square width have identical size.
2, the device that utilizes closed-loop control to increase platform-type scanner scans quality as claimed in claim 1 is characterized in that: wherein above-mentioned calibration chart similarly is to be used for carrying out an image compensation to repair above-mentioned scan image.
3, the device that utilizes closed-loop control to increase platform-type scanner scans quality as claimed in claim 1 is characterized in that: wherein above-mentioned image forming appts comprises the figure image sensor at least.
4, the device that utilizes closed-loop control to increase platform-type scanner scans quality as claimed in claim 1 is characterized in that: wherein above-mentioned drive unit comprises a stepping motor at least.
5, a kind of method of utilizing closed-loop control to increase platform-type scanner scans quality, this platform scanner device comprises a figure image sensor, desires scanning document in order to scan one, it is characterized in that: this method comprises step at least: the scanning optical chi produces a calibration chart picture; Produce the one scan image of this scanning document; Utilize this calibration chart to look like to obtain generation place that goes offline of this scan image; Drive this figure image sensor and obtain actual mobile step number; And be lower than and move predetermined critical when the mobile step number of this reality, maybe when this total quantity that goes offline is higher than a quantity predetermined critical, produce this scan image of this desire scanning document again; Wherein above-mentioned optics chi comprises staggered line to pattern, and above-mentioned staggered line comprises staggered black square and white square to pattern, and above-mentioned black square width and above-mentioned white square width have identical size.
6, the method for utilizing closed-loop control to increase platform-type scanner scans quality as claimed in claim 5 is characterized in that: wherein above-mentioned calibration chart looks like to be used to carry out an image compensation to repair above-mentioned scan image.
7, the method for utilizing closed-loop control to increase platform-type scanner scans quality as claimed in claim 5 is characterized in that: wherein above-mentioned platform-type scanner comprises several above-mentioned optics chis.
8, a kind of method of utilizing closed-loop control to increase platform-type scanner scans quality, this platform scanner device comprises a figure image sensor, desires scanning document in order to scan one, it is characterized in that; This method comprises step at least: utilize the scanning optical chi to produce a calibration chart picture, this optics chi comprises staggered black square and white square; Produce the one scan image of scanned document; Utilize this calibration chart to look like to obtain generation place that goes offline of this scan image; Utilize this calibration chart to look like to carry out an image compensation and repair this scan image; Utilize this calibration chart to look like to produce a displacement; Utilize this displacement to drive this figure image sensor and obtain actual mobile step number; And, when being lower than, the mobile step number of this reality moves predetermined critical, when maybe this total quantity that goes offline is higher than a quantity predetermined critical, produce the scan image of this desire scanning document again, wherein above-mentioned black square width and above-mentioned white square width have identical size.
9, the method for utilizing closed-loop control to increase platform-type scanner scans quality as claimed in claim 8 is characterized in that: wherein above-mentioned optics chi relies on the transparency window of above-mentioned platform-type scanner to settle.
10, the method for utilizing closed-loop control to increase platform-type scanner scans quality as claimed in claim 8 is characterized in that: wherein above-mentioned platform-type scanner comprises several above-mentioned optics chis.
11, the method for utilizing closed-loop control to increase platform-type scanner scans quality as claimed in claim 10 is characterized in that: wherein each above-mentioned optics chi is used for a predetermined scanning resolution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98103424 CN1264330C (en) | 1998-08-06 | 1998-08-06 | Closed-loop controller and control method for improving the scanning quality of gimbal scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98103424 CN1264330C (en) | 1998-08-06 | 1998-08-06 | Closed-loop controller and control method for improving the scanning quality of gimbal scanner |
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| Publication Number | Publication Date |
|---|---|
| CN1244682A CN1244682A (en) | 2000-02-16 |
| CN1264330C true CN1264330C (en) | 2006-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 98103424 Expired - Fee Related CN1264330C (en) | 1998-08-06 | 1998-08-06 | Closed-loop controller and control method for improving the scanning quality of gimbal scanner |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100573668B1 (en) * | 2004-01-19 | 2006-04-26 | 삼성전자주식회사 | Scan image correction device and method thereof |
| CN102170513A (en) * | 2011-03-02 | 2011-08-31 | 吴伟佳 | Image scanning device with speed compensation unit and compensation method thereof |
| CN102780830A (en) * | 2011-05-12 | 2012-11-14 | 鸿富锦精密工业（深圳）有限公司 | Control method and system for flat-type scanner |
| CN102281380A (en) * | 2011-09-09 | 2011-12-14 | 吴伟佳 | Image scanning device with combination light path and speed compensation unit |
| US20190215407A1 (en) * | 2016-09-09 | 2019-07-11 | Hewlett-Packard Development Company, L.P. | Scan bar calibration |
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1998
- 1998-08-06 CN CN 98103424 patent/CN1264330C/en not_active Expired - Fee Related
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| CN1244682A (en) | 2000-02-16 |
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Owner name: YUDONG OPTICAL CO., LTD. Free format text: FORMER OWNER: HONGYOU SCIENCE AND TECHNOLOGY CO LTD Effective date: 20070112 |
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Effective date of registration: 20070112 Address after: Delaware Patentee after: Hongyou Science & Technology Co., Ltd. Address before: No. 25, No. two, RD, Hsinchu Science Park, Taiwan, Hsinchu Patentee before: Hongyou Science and Technology Co., Ltd. |
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Granted publication date: 20060712 Termination date: 20110806 |