CN1271561C - Scanning method for paper-feeding scanning instrument to pick up document image - Google Patents

Abstract

The present invention provides a scanning method for a paper feeding scanner to pick up a file image. The paper feeding type scanner comprises a scanning module, a motor and a memory, wherein the scanning module is used for scanning a file, the memory is used for storing image data. The method comprises: the motor is driven to rotate to drive the file to advance toward a scanning position; before the file reaches the scanning position, the scanning module is activate to start to scan an image; the edge of the file is detected according to an image which is generated when the scanning module scans the image; after the edge of the file is detected, the image data which is generated when the scanning module scans the image is started or stopped from being stored in the memory.

Description

Be used for the scan method of paper feeding scanner to pick up document image

Technical field

The present invention relates to a kind of scan method, the especially a kind of scan method of paper feeding scanner that be used for to pick up document image.

Background technology

Scanner is the vital document treating apparatus of information age, especially paper feeding scanner is subjected to general popular welcome especially when carrying out heap file scanning, paper feeding scanner is different from falt bed scanner, when scanning at every turn, only can place falt bed scanner a file, have only and after having scanned this file, just can place next file and remake scanning, very spend the time, yet, paper feeding scanner is then more convenient, but its single step of releasing places a folded file on the paper box, drive file one by one by the motor in the scanner and advance to scanning position scanning, not only easy to use, more can save a large amount of users' time.

It should be noted that alleged paper feeding scanner in this instructions, also can comprise can be automatically with the file scanner that scans of feed-in one by one.Therefore, automatic paper conveying apparatus is arranged, be also contained in the alleged paper feeding scanner of this instructions for collocation above the falt bed scanner.

Please refer to Fig. 1, Fig. 1 is the synoptic diagram of existing paper feeding scanner 10.Paper feeding scanner 10 includes a housing 12, and puts paper box 14, a step motor 16, a roller 18, a processor 26 and one scan module 20, putting paper box 14 is connected on the housing 12, be used for placing a folded file 15, step motor 16 is installed in the housing 12, being used for driving rolls 18 rotates, and enters in the scanner 10 with further drive file 15.Processor 26 is used for the operation of gated sweep instrument 10, and scan module 20 is placed in the scanner 10, is used for scanning document 15 to produce document image.The position that is positioned at scan module 20 tops is a scanning position, and when roller 18 drove paper tapes and enters scanning position, scan module 20 just can begin scanning document 15, and the document image that will scan gained is stored in the interior internal memory 22 of scanner 10.

Include an optical sensor 24 in the scanner 10 in addition, be used for sensing file 15, in theory, the position of this optical sensor 24 is a fixed value with respect to the distance between the scanning position, and this fixed value can be converted into the step number value that step motor 16 moves and be recorded in the internal memory 22, that is to say, processor 26 can write down after file 15 touches optical sensors 24, step motor 16 drives file 15 again and advances after these some step number values, just activate scan module 20 beginning scanning documents 15, because in theory, after step motor 16 advances some step numbers, therefore file 15 should be driven just to the scanning position place, and scan module 20 also can begin scanning document 15, and the image that will scan gained is stored in the internal memory 22.Similarly, detect the trailing edge of file 15 when optical sensor 24 after, internal memory 22 can calculate equally after step motor 16 readvances some step numbers, just stops the scanning work of scan module 20, because file 15 has left scanning position at this moment in theory.Repeating, paper feeding scanner 10 just can successfully scan a folded file 15 so always.

; owing to be installed in the scanner 10 by operating personnel when optical sensor 24 is manufacturing; the position is easy to have error; also therefore make optical sensor 24 produce error with respect to the distance between the scanning position; yet; pairing step number value is but preset between optical sensor 24 that is write down in the internal memory 22 and the scanning position; this step number value is along with the site error of optical sensor 24 is revised; therefore; when making scan module 20 scanning documents 15, this produces error; be that scan module 20 may shift to an earlier date scanning document 15, or delay scanning document 15 that causing the image of scanning gained is not the real image of file 15 to be scanned.

Please refer to Fig. 2 and Fig. 3, Fig. 2 is scan module 20 synoptic diagram of scanning document 15 in advance, and Fig. 3 delays the synoptic diagram of scanning document 15 for scan module 20.If the site error of optical sensor 24 makes the actual range between itself and the scanning position increase, so after step motor 16 has advanced some theoretical step numbers, file 15 does not but also arrive scanning position, yet owing to preset the cause of theoretical value in the internal memory 22, make that scan module 20 can be when file also arrive scanning position, just begin scanning document 15, promptly as shown in Figure 2, dotted line 28a represents the position that scan module 20 begins to scan among Fig. 2.Because scan module 20 is scanning document 15 in advance, so scan module 20 can scan a undercolor region earlier, (if the background color of scanner 10 is a black, scan module 20 just can scan the undercolor region of a black earlier so) then just can begin scanning document.Similarly, when optical sensor 24 detects the trailing edge of file 15, scan module 20 can be before file 15 trailing edges also leave scanning position yet, just stopped scanning work, cause file 15 trailing edges partly not to be scanned, as shown in Figure 2, the position that on behalf of scan module 20, dotted line 28b stop to scan among Fig. 2.Hence one can see that, and utilizing the detecting result of optical sensor 24 to activate or finish scan module 20 is not good method, and the error of its position can directly influence the effect of scan-image.As for the situation that the site error as if optical sensor 24 makes the actual range reduction between this optical sensor 24 and the scanning position, then as shown in Figure 3, on behalf of scan module 20, dotted line 30a and 30b begin and finish the position of scanning document 15 respectively among Fig. 3.As shown in Figure 3, scan module 20 does not scan the whole part of file 15 equally.Be difficult in the production run avoid owing to the production error results from, on the other hand, along with carrying out day by day of Information technology, the user is more and more strict for the precision requirement of image processing, and therefore, above-described scanning errors is not more and more accepted by the user.Though the sensor that also has the deviser to use other type instead in the prior art comes the position of sensing file 15, as microswitch.Yet, therefore also can't improve above-described problem because its principle and optical sensor 24 are roughly the same.

Summary of the invention

Fundamental purpose of the present invention is to provide a kind of scan method of paper feeding scanner to pick up document image that be used for, and this scan method can improve the degree of accuracy of image processing to reduce scanning errors.

For reaching above-mentioned purpose, the technology of the present invention is at file also before the no show scanning position, just shift to an earlier date scanning document, and after file leaves scanning position, still continue scanning document, and scanning the time utilizes the photosensitive unit that itself exists in the scan module to detect the front and rear edges of file, at last, utilize the left and right edge zone in addition of processor processing file, really belong to the part of document image like this in the fechtable scan-image, make scanner reach the purpose of precision sweep.

Brief Description Of Drawings

Fig. 1 is the synoptic diagram of existing paper feeding scanner.

Fig. 2 shifts to an earlier date the synoptic diagram of scanning document for Fig. 1 scan module.

Fig. 3 delays the synoptic diagram of scanning document for Fig. 1 scan module.

Fig. 4 is the synoptic diagram of paper feeding scanner of the present invention.

Fig. 5 is the comparison diagram of image size with the file size of figure four scanner scanning.

Fig. 6 is this method invention process flow diagram.

Embodiment

Please refer to Fig. 4, Fig. 4 is the synoptic diagram of paper feeding scanner 40 of the present invention.Paper feeding scanner 40 includes a housing 42, and puts paper box 44, an optical sensor 46, a step motor 48, a roller 50, a processor 52 and one scan module 54, putting paper box 44 is connected on the housing 42, be used for placing file 45, optical sensor 46 is arranged on the front end of a folded file 45, is used for detecting file 45.Step motor 48 is installed in the housing 42, is used for driving rolls 50 to rotate, and enters in the scanner 40 with further drive file 45.Processor 52 is used for the operation of gated sweep instrument 40, scan module 54 is placed in the scanner 40, be used for scanning document to produce document image, being positioned at scan module 54 top positions is the one scan position, before roller 50 drive files 45 entered into scanning position, scan module 54 just can begin scanning document 45.

Include a plurality of photosensitive units 56 of arranging with the form of row in the scan module 54, be used for when one of scan module 54 every scanning documents 45 are listed as, the light luminance that this scanning document 45 of sensing is produced is to do further judgement.Scanner 40 of the present invention includes an analog/digital converter 58, an impact damper 60, a decision circuitry 62 and an internal memory 64 in addition, analog/digital converter 58 is connected in a plurality of photosensitive units 56, is used for the analog signal that each photosensitive unit 56 is transmitted is converted to digital signal.Impact damper 60 is connected in analog/digital converter 58, is used for temporarily storing the digital signal that analog/digital converter 58 is sent.Decision circuitry 62 is connected in impact damper 60, include a critical value in it, whether decision circuitry 62 is used for a plurality of digital signal mean values and critical value that impact damper 60 is sent are compared, need the data storage in the impact damper 60 to internal memory 64 with decision.Details are as follows in the operation of the inventive method.

After scanner 40 receives the one scan instruction, scanner 40 just can indicate step motor 48 to come driving rolls 50 to rotate, advance with further drive file 45, when before the file 45 and then when touching optical sensor 46, processor 52 just can calculate after step motor 48 is rotated further some step numbers again, activate scan module 54 beginning scanning works, some step numbers described herein unlike the prior art, these some step numbers are not to equal optical sensor 46 to the distance between the scanning position, but be less than this distance, promptly processor 52 can also activate scan module 54 before the no show scanning position at file 45.Certainly the some step numbers described in the present invention also can be set to 0, and promptly after file 45 1 touched optical sensor 46, processor 52 just activated scan module 54 and begins scanning.As long as scan module 54 begins scanning before the leading edge of file 45 arrives scanning position, all belong to the disclosed technology contents of the present invention.When scan module 54 beginning scan-images, the brightness value of the light that produces in a plurality of photosensitive units 56 meeting sensing scanning processes in the scan module 54, and the analog signal of brightness value is sent to analog/digital converter 58, after analog/digital converter 58 receives this analog signal, can be converted into digital signal, and be sent to impact damper 60, impact damper 60 can further be sent to decision circuitry 62 with this digital signal, decision circuitry 62 can be calculated the mean value of these a plurality of digital signals, and critical value stored in this mean value and the decision circuitry 62 is made comparisons.

The background color of hypothesis scan module 54 is a black in the embodiment of the invention, and suppose when scan module 54 scanning background colors, the brightness value that the photosensitive unit 56 of this scan module 54 is sensed is very low, and when scan module 54 scanning documents, the brightness value that the photosensitive unit 56 of this scan module 54 is sensed is very high, therefore the present invention just sets a critical value according to this feature, the mean value of the brightness value that is sensed when a plurality of photosensitive units 56 is during less than this critical value, just can judge the just part beyond scanning document 45 of scan module 54, it is the background color part of scanner 40, otherwise, when average brightness value during, can judge that just scan module 54 is just in the part of scanning document 45 greater than critical value.

Because processor 52 before file 45 is gone back the no show scanning position, has just activated scan module 54 and begun scanning, so scan module 54 can scan the background color part of scanner 40 at the beginning earlier, so the brightness value that photosensitive unit 56 is sensed is all very low.When decision circuitry 62 with the mean value of this brightness value and critical value relatively the time, this mean value can be less than critical value, therefore decision circuitry 62 can judge that the image that scan module 54 is scanned is the background color part beyond the file 45, and the image of being kept in the impact damper 60 can't be stored in the internal memory 64.So repeat above step until average brightness value during greater than critical value always, this moment, decision circuitry 62 can judge that just scan module 54 has scanned the leading edge of file 45, and with impact damper 60 in this stored data storage to internal memory 64, promptly scanning document image partly is stored in the internal memory 64.

In like manner, after the trailing edge of file 45 no longer was touched this document 45 by optical sensor 46, processor 52 just can calculate after step motor 48 is rotated further some step numbers again, begins to judge when to stop the data of impact damper 60 is deposited to internal memory 64.Be repeated until that so average brightness value that a plurality of photosensitive units 56 are detected is once more during the subcritical value, decision circuitry 62 just can be judged the scan module 54 trailing edge part of scanning document 45, and the stored image data of impact damper 60 these times can't be stored in the internal memory 64, stop scan module 54 simultaneously and continue scanning.Like this, belong to file all image datas partly and all can be stored in the internal memory 64, can't be as there being scanning errors in the prior art, scan and make that some is not scanned module 54 in the file 45.

Please refer to Fig. 5, the image size that Fig. 5 is scanned for Fig. 4 scanner 40 and the comparison diagram of file 45 sizes.Fig. 5 center line 66 is represented the scope of scan module 54 actual scannings, and the zone that dotted line 68a, 68b, 68c, 68d are surrounded then is the size of file 45 itself.Zone beyond file 45 leading edges and the trailing edge (zone beyond dotted line 68a and the dotted line 68b just) is not for belonging to the part of file 45, scanner 40 utilizes above-described method to delete when scanning is carried out, left border and the part beyond the right border (being dotted line 68c and dotted line 68d part in addition) as for file 45, processor 52 can be handled after scan module 54 has scanned a file 45, so that the part image beyond the left and right edge of file 45 is able to deleted.The just image of file 45 just just of the image data that is write down in the internal memory 64 itself does not have any some and is not scanned in the file 45 like this, and the image after the processing can not have more the part that does not belong to file 45 yet.Therefore, scanner 40 of the present invention can scan the file 45 of different sizes exactly.

Please refer to Fig. 6, Fig. 6 is the process flow diagram of the inventive method, and its step is as follows:

Step 100: file 45 to be scanned is positioned over putting on the paper box 44 of scanner 40, and to the instruction of 40 times scanning documents 45 of scanner;

Step 110: step motor 48 driving rollss 50 rotate and advance with further drive file 45;

Step 120: file 45 touches optical sensors 46, and scan module 54 begins scanning document 45 (or scanning document 45) at once later in step motor 48 some step numbers that readvance;

Step 130: during scanning document 45, a plurality of photosensitive units 56 in the scan module 54 when every scanning one column data of scan module 54, the light luminance that is produced in just can sensing scanning, and the analog signal of this brightness value is sent to analog/digital converter 58;

Step 140: analog/digital converter 58 is converted to digital signal with analog signal, and is sent to impact damper 60;

Step 150: impact damper 60 further is sent to decision circuitry 62 with digital signal;

Step 160: decision circuitry 62 is made comparisons the mean value and the critical value of a plurality of digital signals, if the mean value of a plurality of digital signals is greater than critical value, and execution in step 170, otherwise, execution in step 180;

Step 170: scan module 54 detects the leading edge of file 45, carry out step 175;

Step 175: begin the image data of follow up scan module 54 scanning gained is stored in the internal memory 64, carry out step 190;

Step 180: scan module 54 does not detect the leading edge of file 45 yet, skips back to step 130;

Step 190: the trailing edge of file 45 no longer is touched this document 45 by optical sensor 46, and processor 52 just can calculate after step motor 48 is rotated further some step numbers again (or at once), begins to judge the trailing edge of file 45;

Step 200: the light luminance that is produced in a plurality of photosensitive units 56 sensings scanning in the scan module 54, and the analog signal of this brightness value is sent to analog/digital converter 58;

Step 210: analog/digital converter 58 is converted to digital signal with analog signal, and is sent to impact damper 60;

Step 220: buffering 60 further is sent to decision circuitry 62 with digital signal;

Step 230: decision circuitry 62 is made comparisons the mean value and the critical value of a plurality of digital signals, if the mean value of a plurality of digital signals is greater than critical value, and execution in step 240, otherwise, execution in step 250;

Step 240: scan module 54 does not also detect the trailing edge of file 45, continues the data storage in the impact damper 60 to skip back to step 200 to internal memory 64;

Step 250: scan module 54 detects the trailing edge of file 45;

Step 255: stop the data storage in the impact damper 60 to internal memory 64;

Step 260: finish scanning document 45.

Optical sensor 46 among the above embodiment also can be reached with other sensors such as microswitches, in addition, decision circuitry 62 is that the mean value of the brightness that sensed with a plurality of photosensitive units 56 is compared with critical value among the above embodiment, yet, method of the present invention also can be utilized each brightness value is compared with critical value respectively, add up the number of brightness value at last greater than critical value, if the number of this statistics is greater than the words of a default value, represent scan module 54 at scanning document so, otherwise, represent the background color of scan module 54 beyond scanning document 45 partly, this method also can reach the purpose that the present invention will reach, and belongs to the disclosed technology contents of the present invention.

Compared to prior art, before method of the present invention is that file 45 is gone back the no show scanning position, just shift to an earlier date scanning document, and after file 45 leaves scanning position, still continue scanning document 45, by the photosensitive unit 56 of existence in when scanning scan module 54 itself detect file 45 before, trailing edge, with with before the file in the scan-image 45, undercolor region deletion beyond the trailing edge, at last, utilize the processor 52 in the scanner 40 further to handle scan-image, with a left side with file in the scan-image 45, delete in zone beyond the right border, so just really belongs to the part of file 45 images in the fechtable scan-image, makes scanner 40 reach the purpose of precision sweep.

The above only is preferred embodiment of the present invention, and every equivalent variations and modification of making according to claim of the present invention all should belong to the covering scope of patent of the present invention.

Symbol description

10 paper feeding scanners, 12 housings

14 put paper box 15 files

16 stepper motors, 18 rollers

20 scan modules, 22 internal memories

24 optical sensors, 26 processors

40 scanners, 42 housings

44 put paper box 45 files

46 optical sensors, 48 step motor

50 rollers, 52 processors

54 scan modules, 56 photosensitive units

58 analog/digital converters, 60 impact dampers

62 decision circuitry, 64 internal memories

Claims (10)

1. one kind is used for the scan method of paper feeding scanner to pick up document image, wherein said paper feeding scanner includes the one scan module and is used for scanning a file in the one scan position, one motor is used for driving described file, an and internal memory, be used for video data storing, described method includes the following step:

(a) driving described revolution advances towards described scanning position to drive described file;

(b) before described file arrives described scanning position, activate described scan module with the beginning scan-image; And

(c) scan the edge of the described file of image detecting that is produced according to described scan module, and behind the edge that detects described file, begin or stop the image data that described scan module scanning produces is stored in the described internal memory;

Wherein, described scan module comprises a plurality of photosensitive units in addition, being used for the described scan module of sensing scans the light that is produced, one is connected in the analog/digital converter of described a plurality of photosensitive units, the analog signal that is used for that each photosensitive unit is transmitted is converted to digital signal, and a decision circuitry that is connected in described analog/digital converter, be used for judging according to the digital signal that described analog/digital converter transmits whether described scan module scans the edge of described file.

2. scan method as claimed in claim 1 is characterized in that after the leading edge that detects described file, and the image that begins to be produced when described scan module scanned is stored in the described internal memory.

3. scan method as claimed in claim 1 is characterized in that behind the trailing edge that detects described file, stops the image that described scan module produces is stored in the described internal memory.

4. scan method as claimed in claim 1, the decision circuitry that it is characterized in that described analog/digital converter is used for a digital signal and a critical value that described analog/digital converter transmits are compared to judge whether described scan module scans the edge of described file.

5. scan method as claimed in claim 4 is characterized in that described decision circuitry is that mean value and described critical value in order to a plurality of digital signals that described analog/digital converter is transmitted compares to judge whether described scan module scans the edge of described file.

6. scan method as claimed in claim 1 is characterized in that described paper feeding scanner includes a processor in addition, is used for handling the image that described scan module scanning is produced, and described method includes in addition:

After described scan module was finished the described file of scanning, described processor was judged the left border and the right border of file described in the described scan-image, and with the deletion of the image beyond described left border and the right border.

7. scan method as claimed in claim 1 is characterized in that described scanner comprises a paper sensing device in addition, is used for detecting when described file is placed into described scanner described file.

8. scan method as claimed in claim 7 it is characterized in that described paper sensing device is a microswitch, and described microswitch is touched by a file.

9. scan method as claimed in claim 7 it is characterized in that described paper sensing device is an optical sensor, and described paper sensing device can be detected the file that is positioned on the described optical sensor.

10. scan method as claimed in claim 1 is characterized in that described motor is a step motor.

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