CN101924856B - Method and device for testing manuscript inclining angle - Google Patents
Method and device for testing manuscript inclining angle Download PDFInfo
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- CN101924856B CN101924856B CN 200910086666 CN200910086666A CN101924856B CN 101924856 B CN101924856 B CN 101924856B CN 200910086666 CN200910086666 CN 200910086666 CN 200910086666 A CN200910086666 A CN 200910086666A CN 101924856 B CN101924856 B CN 101924856B
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Abstract
The invention provides a method for testing a manuscript inclining angle, which comprises the steps of: scanning a manuscript to obtain a current connecting area and updating a buffer area, calculating an inclining rate of the connecting area in the updated buffer area and updating the array of the inclining rate, judging if ending the scanning of the manuscript, and calculating an inclining angle of the manuscript according to a maximum inclining rate in the array of the inclining rate when ending the scanning of the manuscript, or, continuing to scan the manuscript. The invention solves theproblem of the prior art that the images are scanned twice by using the method of confirming the inclining angle of the image according to the inclining angle of partial image, which increases the buffer data volume and slows down the scanning speed. Besides, the invention also provides a device for testing a manuscript inclining angle.
Description
Technical field
The present invention relates to image processing field, in particular to a kind of method and apparatus of manuscript inclining angle detection.
Background technology
In prior art, it is line fitting method and Hough (Hough) transform method that manuscript inclining angle detects modal method.Line fitting method is a series of (x, y) to be simulated straight line by finding, and the slope by this straight line just can obtain the angle of inclination.The Hough transform method refers to straight line the longest in detected image, and then the slope according to straight line draws the angle of inclination, and the prerequisite that the method is used is that long straight line is arranged in image, and straight slope is consistent with manuscript inclining angle.
Prior art realizes for software often, realizes for hardware, and algorithm complexity is higher and hardware cost is larger.Need simultaneously to rely on some specific conditions, such as Hough change detection angle of inclination, the method need to obtain the frame information of whole manuscript, detects straight line from frame, then draws the angle of inclination; If manuscript does not have frame information, the result of Hough change detection will be difficult to guarantee.The method of fitting a straight line will rely on the result that the colleague detects, and must be namely that the result that the character with delegation calculates just might be accurate.
Also propose the method that other manuscript inclining angle detects in prior art, determine the angle of inclination of manuscript image as the angle of inclination of foundation parts of images, and therefore this method has been difficult to guarantee precision due to the analysis that lacks whole image.
In realizing process of the present invention, the inventor finds to determine that according to the angle of inclination of parts of images the method at the angle of inclination of manuscript image need to cause amount of buffered data larger to image scanning twice in prior art, and speed is slower.
Summary of the invention
The present invention aims to provide the method and apparatus that a kind of manuscript inclining angle detects, can solve in prior art and determine that according to the angle of inclination of parts of images the method at the angle of inclination of manuscript image need to be to twice of image scanning, cause amount of buffered data larger, slow problem.
In an embodiment of the present invention, a kind of method that provides manuscript inclining angle to detect comprises the following steps: the scanning manuscript obtains current connected domain, upgrades buffering area; According to connected domain slope calculations in the buffering area after upgrading, upgrade the slope array, the slope between two connected domains is that the center point coordinate according to two connected domains calculates; Judge the whether end of scan of manuscript; When the manuscript end of scan, according to the slope of contribution degree maximum in the slope array, calculate the angle of inclination of manuscript, otherwise, continue the scanning manuscript.
In an embodiment of the present invention, the device that also provides a kind of manuscript inclining angle to detect comprises: scan module, and be used for the scanning manuscript and obtain current connected domain (block), upgrade buffering area; Computing module, all the connected domain slope calculations in the buffering area that is used for obtaining according to scan module are upgraded the slope array, and the slope between two connected domains is that the center point coordinate according to two connected domains calculates; Judge module is used for judging whether scan module scanning manuscript finishes; Filtration module is used for according to the slope of contribution degree maximum in the slope array, calculating the angle of inclination of manuscript when the manuscript end of scan.
above-described embodiment is by the run-down manuscript, to scan manuscript according to the scanning direction and obtain current connected domain, be updated to the slope array that calculates connected domain after buffering area, last slope according to contribution degree maximum in the slope array, calculate the angle of inclination of manuscript, reduced amount of buffered data, thereby accelerated to detect the speed of manuscript inclining angle, improved the precision that manuscript inclining angle detects, overcome in the prior art and determined that according to the angle of inclination of parts of images the method at the angle of inclination of manuscript image need to be to twice of image scanning, cause amount of buffered data larger, slow problem.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 shows the method flow diagram of manuscript inclining angle detection according to an embodiment of the invention;
Fig. 2 shows connected domain schematic diagram according to an embodiment of the invention;
Fig. 3 shows the schematic diagram of slope between according to a preferred embodiment of the present invention two connected domains of calculating;
Fig. 4 shows the schematic diagram when buffering area slope calculations completely time the according to an embodiment of the invention;
Fig. 5 show according to an embodiment of the invention when buffering area less than the time slope calculations schematic diagram;
Fig. 6 shows the method flow diagram that manuscript inclining angle according to a preferred embodiment of the present invention detects;
Fig. 7 shows the device schematic diagram of manuscript inclining angle detection according to an embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 1 shows the method flow diagram of manuscript inclining angle detection according to an embodiment of the invention, comprises the following steps:
S102, the scanning manuscript obtains current connected domain, upgrades the size of buffering area;
S104 according to the connected domain slope calculations in buffering area after upgrading, upgrades the slope array;
S106 judges the whether end of scan of manuscript, when the manuscript end of scan, and execution in step S108, otherwise, re-execute step S102;
S108 according to the slope of contribution degree maximum in the slope array, calculates the angle of inclination of manuscript.
above-described embodiment is by the run-down manuscript, to scan manuscript according to the scanning direction and obtain current connected domain, be updated to the slope array that calculates connected domain after buffering area, last slope according to contribution degree maximum in the slope array, calculate the angle of inclination of manuscript, reduced amount of buffered data, thereby accelerated to detect the speed of manuscript inclining angle, improved the precision that manuscript inclining angle detects, overcome in the prior art and determined that according to the angle of inclination of parts of images the method at the angle of inclination of manuscript image need to be to twice of image scanning, cause amount of buffered data larger, slow problem.
Preferably, the slope of above-mentioned contribution degree maximum is to call the gaussian filtering algorithm slope array is processed, the slope that the occurrence number that obtains is maximum, and the gaussian filtering algorithm has denoising performance preferably, is fit to the present embodiment.
Preferably, above-mentioned connected domain block refers to the connected region that continuous black pixel point consists of, Fig. 2 shows connected domain schematic diagram according to an embodiment of the invention, as shown in Figure 2, English alphabet " ABC " comprises three connected domains, and the minimum boundary rectangle of its connected domain is respectively 21,22 and 23; Chinese " good " comprises four connected domains, and the minimum boundary rectangle of its connected domain is respectively 24,25,26 and 27.
Each connected domain comprises following information: the minimum boundary rectangle upper left corner point coordinates of connected domain and height, width and the center point coordinate of minimum boundary rectangle.
Preferably, in the method that above-mentioned manuscript inclining angle detects, upgrade buffering area and comprise:
If the size of current connected domain is normal, be stored to buffering area, redefine the size of buffering area.
Preferably, in the method that above-mentioned manuscript inclining angle detects, when buffering area less than the time, the normal size of connected domain refers to the reference dimension that sets in advance; When buffering area completely the time, the normal size of connected domain refers to the connected domain of buffering area is carried out connected domain size after small size filtering is processed.
May there be the situation of multicolumn in whole manuscript, and the character size in different hurdles might be inconsistent, therefore needs dynamic calculation connected domain normal size.In the above-described embodiments, process by the size of the connected domain in buffering area being carried out small size filtering when buffering area is expired, obtain normal dimension information.
Preferably, above-mentioned small size filtering is the filtering of one dimension Gaussian filter, and character duration histogram and character height histogram are done respectively filtering processing, the interference of removing noise.
Preferably, above-mentioned one dimension Gaussian filter is 5 * 1 one dimension Gaussian filter, adopts suitable the present embodiment of one dimension Gaussian filter of 5 * 1.
Preferably, above-mentionedly store described current connected domain into buffering area, the size that redefines described buffering area comprises:
When buffering area less than the time, current connected domain is put into buffering area, simultaneously according to the positional information of all connected domains in buffering area, determine to comprise in buffering area the minimum boundary rectangle of all connected domains;
When buffering area is expired, the connected domain of putting at first in buffering area is shifted out, and current connected domain is put into buffering area, simultaneously according to the positional information of all connected domains in buffering area, determine to comprise in buffering area the minimum boundary rectangle of all connected domains.
Preferably, in the method that above-mentioned manuscript inclining angle detects, according to the connected domain slope calculations of buffering area, upgrade the slope array and comprise:
Calculate the slope between target connected domain and the connected domain around it;
, above-mentioned slope is recorded in the slope array in predefined slope range and the distance of its corresponding connected domain and target connected domain during less than distance threshold when slope.
Fig. 3 shows the schematic diagram of slope between according to a preferred embodiment of the present invention two connected domains of calculating.Slope between two connected domains is that the center point coordinate according to two connected domains calculates.As shown in Figure 3, Chinese " ten days " comprises two connected domains, and the slope between connected domain 31 and connected domain 32 is by the central point 33 of connected domain 31 and the straight slope of the central point 34 of connected domain 32.
Preferably, above-mentioned predefined slope range is (tan α, tan α), and wherein the span of slope threshold value tan α is (0, tan6 °); Above-mentioned distance threshold is to be that horizontal two intersection points of minimum boundary rectangle up-and-down boundary of the straight line of slope threshold value and buffering area are to the maximum of target connected domain distance by target connected domain and slope.
Preferably, when buffering area less than the time, the target connected domain is current connected domain; When buffering area was expired, the target connected domain was to be positioned at the middle connected domain of buffering area.
Fig. 4 shows the schematic diagram when buffering area slope calculations completely time the according to an embodiment of the invention, and as shown in Figure 4, the connected domain block 1 that puts into first in current buffering area is moved out of, and connected domain block 2 is current connected domains of putting into buffering area.The original size of buffering area is the rectangle L1 of dotted portion, and because new block adds, the buffering area scope after renewal is rectangle L2, and the connected domain block 3 in the middle of being positioned at is the target connected domain that needs slope calculations.Calculate successively the slope between other block of L2 in target connected domain block 3 and buffering area, when slope is in predefined slope range (tan α, tan α) in and block, slope is recorded in the slope array during less than distance threshold R to the distance of target connected domain block 3.Wherein, the span of slope threshold value tan α is (0, tan6 °), R is for by target connected domain block 3 and slope being the maximum that horizontal two intersection points of minimum boundary rectangle L2 up-and-down boundary of straight line and the buffering area of tan α arrive target connected domain block 3 distances.Finally, the slope of connected domain is recorded in the slope array in sector region L3, and the slope that is in the block outside sector region L3 does not need to record.
Fig. 5 show according to an embodiment of the invention when buffering area less than the time slope calculations schematic diagram, as shown in Figure 5, the original size of buffering area is the rectangle L1 of dotted portion, because new block adds, buffering area scope after renewal is rectangle L2, and the current connected domain block 2 that puts into buffering area is target block.Calculate successively the slope between other block of L2 in target connected domain block2 and buffering area, when slope is in predefined slope range (tan α, tan α) in and block, slope is recorded in the slope array during less than distance threshold R to the distance of target connected domain block 2.Wherein, the span of slope threshold value tan α is (0, tan6 °), R is for by target connected domain block 2 and slope being the maximum that horizontal two intersection points of minimum boundary rectangle L2 up-and-down boundary of straight line and the buffering area of tan α arrive target connected domain block 2 distances.Finally, the slope of connected domain is recorded in the slope array in sector region L3, and the slope that is in the block outside sector region L3 does not need to record.
Preferably, in the method that above-mentioned manuscript inclining angle detects, call the gaussian filtering algorithm and the slope array is processed the angle of inclination that obtains manuscript specifically comprise:
According to required precision, determine the size of gaussian filtering, and generate corresponding Gaussian filter;
By Gaussian filter, above-mentioned slope array is carried out gaussian filtering twice, obtain the maximum slope of occurrence number;
The angle of inclination that maximum slopes calculates manuscript appears according to above-mentioned number of times.
In the present embodiment, the slope range of setting is (tan5.5 °, tan5.5 °), and the angle of inclination of the manuscript that calculates is 3.5 °.
Fig. 6 shows the method flow diagram that manuscript inclining angle according to a preferred embodiment of the present invention detects, and comprises the following steps:
S202: the scanning manuscript obtains new connected domain block;
S204: judge whether buffering area full, if buffering area is full, carries out S206, if buffering area less than, carry out S208;
S206: the normal size that calculates connected domain block;
S208: judge whether current connected domain block size is normal, if size is normal, carry out S210, if size is undesired, carry out S202;
S210: upgrade buffering area;
S212: according to connected domain slope calculations in buffering area, upgrade the slope array;
S214: judge that whether manuscript scanning finishes, if the end of scan is carried out S216, if scanning does not finish, carries out S202;
S216: gaussian filtering obtains final manuscript inclining angle;
According to required precision, determine the gaussian filtering size in above-described embodiment, and generate Gaussian filter.After carrying out twice gaussian filtering by the slope array that step S212 is obtained, obtain the maximum slope of occurrence number, and then try to achieve final manuscript inclining angle.
Fig. 7 shows the device schematic diagram of manuscript inclining angle detection according to an embodiment of the invention, comprising:
Scan module 10 is used for the scanning manuscript and obtains current connected domain, upgrades buffering area;
Computing module 20, all the connected domain slope calculations in the buffering area that is used for obtaining according to scan module 10 are upgraded the slope array;
Judge module 30 is used for judging whether scan module 10 scanning manuscripts finish;
Filtration module 40 is used for according to the slope of contribution degree maximum in the slope array, calculating the angle of inclination of manuscript when the manuscript end of scan.
above-described embodiment is by the run-down manuscript, to scan according to the scanning direction and calculate the slope array after connected domain that manuscript obtains is updated to buffering area, last slope according to contribution degree maximum in the slope array, calculate the angle of inclination of manuscript, reduced amount of buffered data, thereby accelerated to detect the speed of manuscript inclining angle, improved the precision that manuscript inclining angle detects, overcome in the prior art and determined that according to the angle of inclination of parts of images the method at the angle of inclination of manuscript image need to be to twice of image scanning, cause amount of buffered data larger, slow problem.
Preferably, the slope of above-mentioned contribution degree maximum is to call the gaussian filtering algorithm slope array is processed, the slope that the occurrence number that obtains is maximum, and the gaussian filtering algorithm has denoising performance preferably, is fit to the present embodiment.
Each boundary rectangle comprises following information: the upper left corner location, highly, width and center of mass point position.
Preferably, above-mentioned scan module comprises:
The first judging unit is used for judging whether the size of connected domain is normal.
Preferably, above-mentioned scan module also comprises:
The second judging unit is used for judging whether buffering area is full.
Preferably, in the device that above-mentioned manuscript inclining angle detects, when buffering area less than the time, the normal size of connected domain refers to the reference dimension that sets in advance; When buffering area completely the time, the normal size of connected domain refers to the connected domain of buffering area is carried out connected domain size after small size filtering is processed.
May there be the situation of multicolumn in whole manuscript, and the character size in different hurdles might be inconsistent, therefore needs dynamic calculation connected domain block normal size.In the above-described embodiments, process by the size of the connected domain block in buffering area being carried out small size filtering when buffering area is expired, obtain normal dimension information.
Preferably, above-mentioned small size filtering is the one dimension gaussian filtering, and character duration histogram and character height histogram are done respectively filtering processing, the interference of removing noise.
Preferably, above-mentioned one dimension gaussian filtering is 5 * 1 one dimension gaussian filtering, adopts suitable the present embodiment of one dimension gaussian filtering of 5 * 1.
Preferably, above-mentioned computing module comprises:
The first computing unit, be used for calculating the slope between buffering area target connected domain and the connected domain around it,, slope is recorded in the slope array in predefined slope range and the distance of its corresponding connected domain and target connected domain during less than distance threshold when slope.
Preferably, in the above-described embodiments, when buffering area less than the time, the target connected domain is current connected domain; When buffering area was expired, the target connected domain was to be positioned at the middle connected domain of buffering area.
Preferably, filtration module comprises:
Generation unit is used for according to required precision, determines the size of gaussian filtering, and generates corresponding Gaussian filter;
The second computing unit is used for the Gaussian filter according to the generation unit generation, and the slope array that is obtained by computing module is carried out gaussian filtering twice, obtains the maximum slope of occurrence number;
The 3rd computing unit, the angle of inclination that the slope that is used for obtaining according to the second computing unit calculates manuscript.
obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step being made into the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. the method that manuscript inclining angle detects, is characterized in that, comprises the following steps:
The scanning manuscript obtains current connected domain, upgrades buffering area;
According to the connected domain slope calculations in described buffering area after upgrading, upgrade the slope array, the slope between two connected domains is that the center point coordinate according to two connected domains calculates;
Judge the whether end of scan of described manuscript;
When the described manuscript end of scan, according to the slope of contribution degree maximum in described slope array, calculate the angle of inclination of described manuscript; The slope of described contribution degree maximum is to call the gaussian filtering algorithm described slope array is processed, the slope that the occurrence number that obtains is maximum;
Otherwise, continue the described manuscript of scanning;
Wherein, upgrade buffering area and comprise: when the size of described current connected domain is normal, be stored to buffering area, redefine the size of described buffering area, wherein, when described buffering area less than the time, the normal size of described connected domain refers to the reference dimension that sets in advance; When described buffering area completely the time, the normal size of described connected domain refers to the connected domain of buffering area is carried out connected domain size after small size filtering is processed;
Wherein, store described current connected domain into buffering area, the size that redefines described buffering area comprises:
When described buffering area less than the time, described current connected domain is put into described buffering area, simultaneously according to the positional information of all connected domains in described buffering area, determine the minimum boundary rectangle that comprises all connected domains of described buffering area;
When described buffering area is expired, the connected domain of putting at first in buffering area is shifted out, and described current connected domain is put into described buffering area, simultaneously according to the positional information of all connected domains in described buffering area, determine the minimum boundary rectangle that comprises all connected domains of described buffering area.
2. the method for manuscript inclining angle detection according to claim 1, is characterized in that, described small size filtering is the filtering of one dimension Gaussian filter.
3. the method for manuscript inclining angle detection according to claim 2, is characterized in that, described one dimension Gaussian filter is 5 * 1 one dimension Gaussian filter.
4. the method for manuscript inclining angle detection according to claim 1, is characterized in that, according to the connected domain slope calculations of described buffering area, upgrades the slope array and comprise:
Calculate the slope between target connected domain and the connected domain around it;
, described slope is recorded in the slope array in predefined slope range and the distance of its corresponding connected domain and described target connected domain during less than distance threshold when described slope.
5. the method for manuscript inclining angle detection according to claim 4, is characterized in that,
Described slope range is (tan α, tan α), and wherein the span of slope threshold value tan α is (0, tan6 °);
Described distance threshold is to be that horizontal two intersection points of minimum boundary rectangle up-and-down boundary of the straight line of described slope threshold value and described buffering area are to the maximum of described target connected domain distance by described target connected domain and slope.
6. the method for manuscript inclining angle detection according to claim 4, is characterized in that,
When described buffering area less than the time, described target connected domain is described current connected domain;
When described buffering area was expired, described target connected domain was to be positioned at the middle connected domain of described buffering area.
7. the device that manuscript inclining angle detects, is characterized in that, comprising:
Scan module is used for the scanning manuscript and obtains current connected domain, upgrades buffering area;
Computing module is used for according to all the connected domain slope calculations in described buffering area, upgrades the slope array, and the slope between two connected domains is that the center point coordinate according to two connected domains calculates;
Judge module is used for judging whether described scan module scanning manuscript finishes;
Filtration module, be used for when the described manuscript end of scan, slope according to contribution degree maximum in described slope array, calculate the angle of inclination of described manuscript, the slope of described contribution degree maximum is to call the gaussian filtering algorithm described slope array is processed, the slope that the occurrence number that obtains is maximum;
Wherein, upgrade buffering area and comprise: when the size of described current connected domain is normal, be stored to buffering area, redefine the size of described buffering area, wherein, when described buffering area less than the time, the normal size of described connected domain refers to the reference dimension that sets in advance; When described buffering area completely the time, the normal size of described connected domain refers to the connected domain of buffering area is carried out connected domain size after small size filtering is processed;
Wherein, store described current connected domain into buffering area, the size that redefines described buffering area comprises:
When described buffering area less than the time, described current connected domain is put into described buffering area, simultaneously according to the positional information of all connected domains in described buffering area, determine the minimum boundary rectangle that comprises all connected domains of described buffering area;
When described buffering area is expired, the connected domain of putting at first in buffering area is shifted out, and described current connected domain is put into described buffering area, simultaneously according to the positional information of all connected domains in described buffering area, determine the minimum boundary rectangle that comprises all connected domains of described buffering area.
8. the device of manuscript inclining angle detection according to claim 7, is characterized in that, described scan module comprises:
The first judging unit is used for judging whether the size of described connected domain is normal.
9. the device of manuscript inclining angle detection according to claim 8, is characterized in that, described scan module also comprises:
The second judging unit is used for judging whether described buffering area is full.
10. the device of manuscript inclining angle detection according to claim 9, is characterized in that, described computing module comprises:
The first computing unit, be used for calculating the slope between buffering area target connected domain and the connected domain around it,, described slope is recorded in the slope array in predefined slope range and the distance of its corresponding connected domain and described target connected domain during less than distance threshold when described slope.
11. the device that manuscript inclining angle according to claim 10 detects is characterized in that,
When described buffering area less than the time, described target connected domain is described current connected domain;
When described buffering area was expired, described target connected domain was to be positioned at the middle connected domain of described buffering area.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910086666 CN101924856B (en) | 2009-06-17 | 2009-06-17 | Method and device for testing manuscript inclining angle |
| JP2010101988A JP5244850B2 (en) | 2009-06-17 | 2010-04-27 | Document tilt angle detection method and document tilt angle detection apparatus |
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| CN 200910086666 CN101924856B (en) | 2009-06-17 | 2009-06-17 | Method and device for testing manuscript inclining angle |
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| CN2371605Y (en) * | 1999-01-20 | 2000-03-29 | 力捷电脑股份有限公司 | Scanning image disturbance corrector for automatic paper feeder |
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| CN1573590A (en) * | 2003-05-27 | 2005-02-02 | 夏普株式会社 | Sheet transport device, image reading device, and image forming device |
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| JPH01205287A (en) * | 1988-02-10 | 1989-08-17 | Oki Electric Ind Co Ltd | Character line inclination detector |
| JPH05174182A (en) * | 1991-12-19 | 1993-07-13 | Seiko Epson Corp | Method and device for document tilt angle detection |
| JP3303246B2 (en) * | 1992-12-28 | 2002-07-15 | 株式会社リコー | Image processing device |
| JP2778437B2 (en) * | 1993-12-27 | 1998-07-23 | 日本電気株式会社 | Document image tilt detection device |
| KR101010961B1 (en) * | 2003-10-13 | 2011-01-26 | 학교법인 서강대학교 | Method for spatial deinterlacing using block based region clasification |
| CN100382097C (en) * | 2004-08-10 | 2008-04-16 | 明基电通股份有限公司 | Method and apparatus for estimating file inclination |
| KR100738522B1 (en) * | 2004-12-21 | 2007-07-11 | 삼성전자주식회사 | Apparatus and method for distinction between camera movement and object movement and extracting object in video surveillance system |
| JP2006211544A (en) * | 2005-01-31 | 2006-08-10 | Kyocera Mita Corp | Image forming apparatus |
| CN100535930C (en) * | 2007-10-23 | 2009-09-02 | 北京大学 | Complex structure file image inclination quick detection method |
| CN101425142B (en) * | 2008-09-17 | 2011-05-11 | 北大方正集团有限公司 | Method and device for determining page angle of slope |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2371605Y (en) * | 1999-01-20 | 2000-03-29 | 力捷电脑股份有限公司 | Scanning image disturbance corrector for automatic paper feeder |
| CN1359230A (en) * | 2002-01-16 | 2002-07-17 | 北京北大方正集团公司 | Scanning input method for printed color plate picture |
| CN1573590A (en) * | 2003-05-27 | 2005-02-02 | 夏普株式会社 | Sheet transport device, image reading device, and image forming device |
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| Title |
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| JP特开平9-44595A 1997.02.14 |
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| CN101924856A (en) | 2010-12-22 |
| JP5244850B2 (en) | 2013-07-24 |
| JP2011003181A (en) | 2011-01-06 |
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