CN102842034A - Device for laser scanning and automatically identifying carved character and identification method - Google Patents
Device for laser scanning and automatically identifying carved character and identification method Download PDFInfo
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- CN102842034A CN102842034A CN2012102370019A CN201210237001A CN102842034A CN 102842034 A CN102842034 A CN 102842034A CN 2012102370019 A CN2012102370019 A CN 2012102370019A CN 201210237001 A CN201210237001 A CN 201210237001A CN 102842034 A CN102842034 A CN 102842034A
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Abstract
A device and a method for laser scanning and automatically identifying a carved character include a laser scanning detection device and identification method for the carved character. The device comprises a word line laser device, a transport table, a video camera, an image processing and character identifying machine, a computer control system and a database. The scanning and automatic identifying method comprises the steps of: 1) monitoring whether a work-piece to be identified enters a scanning area; 2) scanning the character on the work-piece; 3) collecting the carved character to scan a video image signal; 4) monitoring whether the work-piece departs from the scanning area; 5) processing the video image signal to obtain a character image, and carrying out character division and character identification on the character image, and 6) storing an identifying result into the database. The device and method are not affected by outside ambient light, color and material of the character, and are fast in speed, high in identification rate, simple in operation and high in automatic degree.
Description
Technical field
The present invention relates to a kind of laser scanning character recognition device and method, particularly a kind of apparatus and method that are used for engraving character identification.
Background technology
Engraving character often appears on some labels or the foundry goods, such as the worker's piece number on railway freight-car bolster and the bogie side frame, realizes that the automatic identification of engraving character is significant to improving manufacturing informationization and robotization.Traditional recognition method has: the manual work automatically identification of reading and take a picture, railway foundry goods can also realize that the DR image discerns automatically.
It is slow that character method speed is read in manual work, and the labor intensive resource is high, and work is prone to cause operating personnel's fatigue to cause artificial error for a long time.
Photograph identification automatically is exactly the photo that adopts CCD camera engraving character earlier, and comparison film conversion gained digital picture is handled then, adopts the image character recognizer to discern.The method is similar to the identification of print character, but its difficulty discerns much larger than print character, and main cause is: engraving character color and background color no significant difference, and contrast is low; Through " reflective poor " imaging, the gray scale of character own is inconsistent; The character local feature is not obvious; Influenced by illumination and shooting angle, the identical characters local feature changes greatly.Therefore be difficult to character and background segment are come, let alone identification character.As to invent application publication number be that the Chinese invention patent of CN102169541A provides a kind of character recognition input system and method thereof that adopts optical alignment.It forms hot spot through the emission light beam on the text surface, and text image is obtained in the image capture module shooting; Image processing module carries out symbol segmentation with text image; Discern literal and symbol at last.This system is not suitable for the identification of engraving character owing to gather print character image identification character again through visible light.People such as Li Jianmei have studied a kind of recognition methods of label protuberant character, and they have proposed a kind of protuberant character feature extraction new method based on gray level image and Gabor conversion.At first designed one group of Gabor wave filter; Gray level image to protuberant character directly carries out feature extraction then; Extract the local stroke feature on the four directions such as protuberant character level, vertical, left and right diagonal line respectively, set up a kind of constant Gabor feature space on this basis, this method of experiment proof can extract and Identifiaction plates on protuberant character (referring to Li Jianmei; Lu Changhou; Li Guoping. based on the protuberant character image feature extraction new method of Gabor conversion. system emulation journal, 2008,20 (8): 2133-2136).But this method is very big for the larger sized engraving character difficulty of identification.
The railway foundry goods also can form the image of carver's piece number on the foundry goods, but the ray energy penetration capacity of X-ray production apparatus is limited through X ray DR imaging, and the uneven thickness of foundry goods own, makes some character image fuzzy low with background contrasts, can't discern.
Summary of the invention
One object of the present invention just provides a kind of laser scanning and the device of discerning engraving character automatically, and it is scanning collection engraving character image quickly and accurately, and character is handled, discerned and stores, and speed is fast, and is simple to operate, and automaticity is high.
This purpose of the present invention is to realize that through such technical scheme it includes transfer station, infrared sensor, a word line laser instrument, video camera, Flame Image Process and character recognition system, computer control system and database;
Transfer station transmits workpiece to be identified to surveyed area, and at the uniform velocity drags workpiece to be identified and pass surveyed area;
Infrared sensor is used to monitor object to be identified and whether gets into scanning area, and monitor signal is sent to computer control system;
One word line laser instrument sends the in-line laser rays under the control of computer control system, and directly over the workpiece to be identified vertical irradiation to character;
Video camera is taken the engraving character video of a word line laser scans, is sent to Flame Image Process and character recognition system and database;
Flame Image Process and character recognition system, the acquisition camera video also carries out decoding processing, obtains the bianry image of engraving character, utilizes algorithm for pattern recognition identification character image, obtains the engraving character coding;
Computer control system is sent the work steering order, receives and the work of treatment signal;
Database is used for memory scanning video and the engraving character coding after character recognition system identification.
Further, said device also includes and is installed in the preceding red filter of camera lens.
Further, a said word line linear laser that laser instrument is launched, the width at focal length 50cm place is 0.8mm, laser rays directly over the workpiece vertical irradiation on workpiece.
Further; Said position for video camera is in last the place ahead of transfer station direction of motion; Face with the laser rays place of being sent with a word line laser instrument becomes
angle,
.
One object of the present invention just provides a kind of laser scanning and the method for discerning engraving character automatically; It can accomplish the scanning of engraving character automatically, and scan video is decoded, and then the character picture is cut apart and identification automatically; Its identification does not receive the influence of color, Facing material and ambient light; Discrimination is high, and is simple to operate, and automaticity is high.
This purpose of the present invention is to realize that through such technical scheme its step is following:
1) open infrared sensor, whether monitoring remains recognition object gets into scanning area, if do not have, then continues monitoring, if having, then changes step 2 over to);
2) open a word line laser instrument, laser rays shines on the object that moves on the transfer station, and video camera is taken the video of scanning object;
3) whether the infrared sensor monitoring object leaves scanning area, if do not leave, then continues step 2), if leave, then close a word line laser instrument and turn to step 4);
4) Flame Image Process and character recognition system are decoded to the video of gathering, and the scan image that the acquisition time is continuous extracts the sweep trace information on the engraving character in every width of cloth image, becomes a width of cloth character bianry image to the scanning yoke of all extractions as vertical consolidation;
5) character code that adopts SVMs SVM method identification character image to obtain;
6) coding of the engraving character after will discerning deposits in the database.
Further; The translational speed of said transfer station is 11mm/s, and the frame frequency of video camera is 24 frame per seconds, is 0.8mm at the width of a word line laser focused place laser; The width of engraving character stroke is 2～4mm, guarantees to extract p.s. 12 frame pictures in the video decoding process.
Further, it is following to be merged into the concrete steps of a width of cloth character picture described in the step 4):
When 4-1) a word line laser radiation is on character, the laser rays on two planes occurs being positioned at, the laser rays on the non-engraving character is positioned at same plane, is made as reference laser lines, and the laser rays on the engraving character is positioned at same plane;
4-2) the character bianry image is synthetic, keeps the length and the width of the laser rays on the engraving character in every frame picture constant, and with its in chronological sequence vertically combination of order, combined distance is closely adjacent between adjacent picture, obtains complete engraving character bianry image;
4-3) adopt smoothing filter that image is carried out filtering, reduce picture noise, adopt mathematics form method that image is handled, repair the discontinuous part of topological structure in the image.
Owing to adopted technique scheme, the present invention to have following advantage:
The present invention is not easy to receive the interference of external environment, and images acquired does not receive the influence of color, Facing material and ambient light, and discrimination is high, automaticity is high, speed is fast, simple to operate.
Other advantages of the present invention, target and characteristic will be set forth in instructions subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from practice of the present invention, obtain instruction to investigating of hereinafter.Target of the present invention and other advantages can realize and obtain through following instructions and claims.
Description of drawings
Description of drawings of the present invention is following.
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a working state schematic representation of the present invention;
Characteristic synoptic diagram when Fig. 3 is a word line laser radiation to engraving character;
Fig. 4 is a character recognition process flow diagram of the present invention;
Fig. 5 is a Character segmentation algorithm flow chart of the present invention.
Among the figure: 1. a word line laser instrument; 2. video camera; 3. red filter; 4. infrared sensor; 5. computer control system; 6. object; 7. transfer station.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
A kind of laser scanning and the device of discerning engraving character automatically, it is characterized in that: said device includes transfer station, infrared sensor, a word line laser instrument, video camera, Flame Image Process and character recognition system, computer control system and database;
Transfer station transmits workpiece to be identified to surveyed area, and at the uniform velocity drags workpiece to be identified and pass surveyed area;
Infrared sensor is used to monitor object to be identified and whether gets into scanning area, and monitor signal is sent to computer control system;
One word line laser instrument sends the in-line laser rays under the control of computer control system, and directly over the workpiece to be identified vertical irradiation to character;
Video camera is taken the engraving character video of a word line laser scans, is sent to Flame Image Process and character recognition system and database;
Flame Image Process and character recognition system, the acquisition camera video also carries out decoding processing, obtains the bianry image of engraving character, utilizes algorithm for pattern recognition identification character image, obtains the engraving character coding;
Computer control system is sent the work steering order, receives and the work of treatment signal;
Database is used for memory scanning video and the engraving character coding after character recognition system identification.
As shown in Figure 2, before engraving character scanned, with on the infrared sensor 4 monitoring transfer stations 7 whether object to be identified 6 being arranged; When transfer station 7 is delivered to object 6 to be identified in the scanning area; Computer control system 5 starts a word line laser instrument 1 and sends linear laser, and laser rays is radiated on the engraving character of object 6, the overall process of video camera 2 shot object uniform motion; Video camera 2 is gathered video; And video handled and character recognition, scanning was accomplished when object 6 left, and computer control system 5 is closed a word line laser instrument 1.
A kind of laser scanning according to the invention comprises having with the software module of discerning the engraving character device automatically:
Laser emission control module, its effect are the triggerings of accepting infrared inductor, send the corresponding instruction startup or close a word line laser instrument according to trigger signal types.
Video acquisition control module, its effect are to send instruction to start the video camera capture video, and carry out the video acquisition operation, close a word line laser and a video camera after the finishing collecting, and stop to gather.
Character synthesis module, its effect are with the video decode of gathering, according to time and position coordinates extraction character sweep trace, a synthetic width of cloth character bianry image.
Image pre-processing module, its effect are the damaged parts of image denoising, reparation character.
Character locating module, its effect are to confirm position and the scope of character in scan image, and it is split.
Character segmentation module, its effect are that Character segmentation is become dull one by one character block, and its segmentation result will directly influence the result of character recognition, cut apart accurately more, and be just beneficial more to the process of identification.
Character recognition module, its effect are the characters of carrying out in the recognizer recognition image, and are kept at the result in the object detection database.
As shown in Figure 2, said device also includes and is installed in the preceding red filter 3 of video camera 2 camera lenses.Red filter 3 transmit red light reduce the interference of other light, the raising property ratio of making an uproar.
In order to reduce interference, the video of shooting is more clear, and said device also includes and is installed in the preceding red filter of camera lens.
A said word line linear laser that laser instrument is launched, the width at focal length 50cm place is 0.8mm, laser rays directly over the workpiece vertical irradiation on workpiece.
Said position for video camera is in last the place ahead of transfer station direction of motion; Face with the laser rays place of being sent with a word line laser instrument becomes
angle,
.
A kind of laser scanning and the method for discerning engraving character automatically, its step is following:
1) open infrared sensor, whether monitoring remains recognition object gets into scanning area, if do not have, then continues monitoring, if having, then changes step 2 over to);
2) open a word line laser instrument, laser rays shines on the object that moves on the transfer station, and video camera is taken the video of scanning object;
3) whether the infrared sensor monitoring object leaves scanning area, if do not leave, then continues step 2), if leave, then close a word line laser instrument and turn to step 4);
4) Flame Image Process and character recognition system are decoded to the video of gathering, and the scan image that the acquisition time is continuous extracts the sweep trace information on the engraving character in every width of cloth image, becomes a width of cloth character bianry image to the scanning yoke of all extractions as vertical consolidation;
5) character code that adopts SVMs SVM method identification character image to obtain;
6) coding of the engraving character after will discerning deposits in the database.
The translational speed of said transfer station is 11mm/s; The frame frequency of video camera is 24 frame per seconds; Width at a word line laser focused place laser is 0.8mm, and the width of engraving character stroke is 2～4mm, confirms that therefore per second extracts 12 frame pictures for being combined into the minimum picture of character.
The concrete steps that are merged into a width of cloth character picture described in the step 4) are following:
When 4-1) a word line laser radiation is on character, the laser rays on two planes occurs being positioned at, the laser rays on the non-engraving character is positioned at same plane, is made as reference laser lines, and the laser rays on the engraving character is positioned at same plane;
4-2) the character bianry image is synthetic, keeps the length and the width of the laser rays on the engraving character in every frame picture constant, and with its in chronological sequence vertically combination of order, combined distance is closely adjacent between adjacent picture, obtains complete engraving character bianry image;
4-3) adopt smoothing filter that image is carried out filtering, reduce picture noise, adopt mathematics form method that image is handled, repair the discontinuous part of topological structure in the image.
The extraction of picture feature information, engraving character be with surface of the work not at the character on a plane, the character cut in bas-relief symbol is lower than surface of the work; Raised character is higher than surface of the work, because the difference of character and surface of the work height, when a word line laser radiation is on character; A laser rays that fluctuates will occur, the laser rays of the non-engraving character part of surface of the work is a reference line, and the laser rays fluctuation of character part is above the reference line or all; As shown in Figure 3; The laser rays that the engraving character high spot shows representes that with straight line 8 laser rays at smooth place is that reference line is represented with straight line 9, extracts the laser rays information of every frame picture cathetus 8.
The concrete steps of identification engraving character image are following in the step 5):
5-1) judge whether character is arranged in the image, if there is character then to change step 5-2 over to), if then do not wait for next object scan image;
5-2) adopt the texture analysis method that character is positioned;
5-3) utilize the Hough conversion to find the angle of inclination of inclination character; The correct tilt character is a horizontal direction; Adopt the method for projection to carry out Character segmentation, character picture is made vertical projection, obtain one dimension drop shadow curve; The trough of seeking curve is as the separatrix between the character, by the separatrix separating character;
5-4) adopt the method for support vector base SUM to carry out character recognition.
Step 5-4) SUM of vector basis described in method includes SVM training and SVM identifying.
Said SVM training concrete steps are following:
5-4-1-1) character after will cutting apart is handled through normalization, and does normalization to pixel value and handle, as the input feature value of SVM;
5-4-1-2) with step 5-4-1-1) in character feature after handling by rows end to end, obtain characteristic row vector;
5-4-1-3) all above-mentioned two step process of all characters that will train, identical then character is classified as one type, generates the proper vector set of character.
The concrete steps of said SVM identification are:
5-4-2-1) to the character that will discern carry out the normalization of image size and the normalization processing of pixel value, as the picture that will discern;
5-4-2-2) with step 5-4-2-1) in the pixel value of the image that the obtains vector that arranges in a row, import as SVM;
5-4-2-3) utilize the character that generates in the SVM training process to discern, be input as the row vector, the sign of output character is compared identification one by one with the character that generates in the SVM training process.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of present technique scheme, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. the laser scanning and the device of identification engraving character automatically, it is characterized in that: said device includes transfer station, infrared sensor, a word line laser instrument, video camera, Flame Image Process and character recognition system, computer control system and database;
Transfer station transmits workpiece to be identified to surveyed area, and at the uniform velocity drags workpiece to be identified and pass surveyed area;
Infrared sensor is used to monitor object to be identified and whether gets into scanning area, and monitor signal is sent to computer control system;
One word line laser instrument sends the in-line laser rays under the control of computer control system, and directly over the workpiece to be identified vertical irradiation to character;
Video camera is taken the engraving character video of a word line laser scans, is sent to Flame Image Process and character recognition system and database;
Flame Image Process and character recognition system, the acquisition camera video also carries out decoding processing, obtains the bianry image of engraving character, utilizes algorithm for pattern recognition identification character image, obtains the engraving character coding;
Computer control system is sent the work steering order, receives and the work of treatment signal;
Database is used for memory scanning video and the engraving character coding after character recognition system identification.
2. a kind of laser scanning as claimed in claim 1 and the device of discerning engraving character automatically is characterized in that: said device also includes and is installed in the preceding red filter of camera lens.
3. a kind of laser scanning as claimed in claim 1 and the device of discerning engraving character automatically; It is characterized in that: a said word line linear laser that laser instrument is launched; Width at focal length 50cm place is 0.8mm, laser rays directly over the workpiece vertical irradiation on workpiece.
4. a kind of laser scanning as claimed in claim 1 and the device of discerning engraving character automatically; It is characterized in that: said position for video camera is in last the place ahead of transfer station direction of motion; Face with the laser rays place of being sent with a word line laser instrument becomes
angle,
.
5. like any described a kind of laser scanning of claim 1-4 and the method that the device of discerning engraving character automatically carries out character recognition, it is characterized in that its step is following:
1) open infrared sensor, whether monitoring remains recognition object gets into scanning area, if do not have, then continues monitoring, if having, then changes step 2 over to);
2) open a word line laser instrument, laser rays shines on the object that moves on the transfer station, and video camera is taken the video of scanning object;
3) whether the infrared sensor monitoring object leaves scanning area, if do not leave, then continues step 2), if leave, then close a word line laser instrument and turn to step 4);
4) Flame Image Process and character recognition system are decoded to the video of gathering, and the scan image that the acquisition time is continuous extracts the sweep trace information on the engraving character in every width of cloth image, becomes a width of cloth character bianry image to the scanning yoke of all extractions as vertical consolidation;
5) character code that adopts SVMs SVM method identification character image to obtain;
6) coding of the engraving character after will discerning deposits in the database.
6. a kind of laser scanning as claimed in claim 5 and the method for discerning engraving character automatically; It is characterized in that: the translational speed of said transfer station is 11mm/s; The frame frequency of video camera is 24 frame per seconds; Width at a word line laser focused place laser is 0.8mm, and the width of engraving character stroke is 2～4mm, guarantees to extract p.s. 12 frame pictures in the video decoding process.
7. a kind of laser scanning as claimed in claim 5 and the method for discerning engraving character automatically is characterized in that the concrete steps that are merged into a width of cloth character picture described in the step 4) are following:
When 4-1) a word line laser radiation is on character, the laser rays on two planes occurs being positioned at, the laser rays on the non-engraving character is positioned at same plane, is made as reference laser lines, and the laser rays on the engraving character is positioned at same plane;
4-2) the character bianry image is synthetic, keeps the length and the width of the laser rays on the engraving character in every frame picture constant, and with its in chronological sequence vertically combination of order, combined distance is closely adjacent between adjacent picture, obtains complete engraving character bianry image;
4-3) adopt smoothing filter that image is carried out filtering, reduce picture noise, adopt mathematics form method that image is handled, repair the discontinuous part of topological structure in the image.
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| CN105092051A (en) * | 2014-04-29 | 2015-11-25 | 杭州美盛红外光电技术有限公司 | Information acquiring device and information acquiring method |
| CN105279506A (en) * | 2015-09-29 | 2016-01-27 | 大连民族大学 | Manchu script central axis positioning method |
| CN109000583A (en) * | 2013-05-22 | 2018-12-14 | 康耐视公司 | The system and method for carrying out active surface measurement using laser displacement sensor |
| CN109048072A (en) * | 2018-08-21 | 2018-12-21 | 深圳市创客工场科技有限公司 | Laser processing, device, equipment and computer readable storage medium |
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| CN110378960A (en) * | 2019-07-26 | 2019-10-25 | 青岛特锐德电气股份有限公司 | A kind of positioning identifying method and device of charging interface |
| CN111898609A (en) * | 2020-07-22 | 2020-11-06 | 上海大学 | Angle iron steel seal visual identification system and method with line laser as assistance |
| CN112192032A (en) * | 2020-09-30 | 2021-01-08 | 深圳市睿达科技有限公司 | High-speed laser uniform carving method |
| CN113610083A (en) * | 2021-08-13 | 2021-11-05 | 天津大学 | Character recognition and character engraving depth detection system and detection method for vehicle VIN code |
| CN113610083B (en) * | 2021-08-13 | 2023-07-25 | 天津大学 | Character recognition and character engraving depth detection system and method for vehicle VIN code |
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