WO2004076968A1 - Verfahren zur qualitätskontrolle von zweidimensionalen matrix-codes an metallischen werkstücken mit einem bildveratrbeitungsgerät - Google Patents
Verfahren zur qualitätskontrolle von zweidimensionalen matrix-codes an metallischen werkstücken mit einem bildveratrbeitungsgerät Download PDFInfo
- Publication number
- WO2004076968A1 WO2004076968A1 PCT/EP2003/012405 EP0312405W WO2004076968A1 WO 2004076968 A1 WO2004076968 A1 WO 2004076968A1 EP 0312405 W EP0312405 W EP 0312405W WO 2004076968 A1 WO2004076968 A1 WO 2004076968A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- marking
- processing device
- image processing
- recorded
- image
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
Definitions
- the invention relates to a method for quality control of two-dimensional matrix codes on metallic workpieces, which are in the form of embossed marking points, with an image processing device.
- the marking points of such a two-dimensional matrix code are usually hammered in using a hard metal needle of a marking tool. On the one hand, this takes place very quickly and, on the other hand, in a very close arrangement, whereby such matrix areas can be very small and have only a few millimeters in length and width.
- the precision when attaching the marking points is of great importance, the exact shape, size, position and depth of the marking points being important quality features. It is therefore very important to check during or after the production of such a matrix code whether the information can be read back correctly, that is, whether the marking points te in the right place in the required quality.
- the square matrix codes have two adjacent border lines with closely following marking points. These two edge lines are searched for in the image data recorded by a camera as an image processing device in order to detect the position of the matrix code in this way.
- the two other border lines have marking points, the spacing of which corresponds to that of the grid lines of a grid that has the marking points as grid points. In this way, these grid points are determined from the image data, and it is then checked at the calculated points whether there is a marking point of the desired quality there.
- the image acquisition, image processing and subsequent calculation include a variety of error factors in quality control that make the entire process very imprecise, especially with very small point distances.
- the invention has for its object to provide a method for quick, simple and precise quality control of two-dimensional matrix codes.
- This object is achieved according to the invention in that the marking points are embossed using predetermined digital position data using a marking tool (17), and then using the image processing device (22) only to capture the corresponding image data for checking at precisely the locations specified by the position data there is a correct marking point with the desired quality characteristics.
- the advantages of the method according to the invention are, in particular, that the known finder function can be dispensed with and is replaced by a much more precise method for locating the marking points and for checking them.
- the position data for the marking tool which is predetermined anyway, is fed to the image processing device so that it has the exact coordinates of the marking points without image acquisition.
- the quality check then only needs to be carried out at these coordinate points. All errors of the known methods which are associated with the determination of the coordinate positions are therefore practically completely eliminated, so that the quality check of the marking points can be carried out with much greater accuracy.
- the mean value of the positional deviations of all marking points is advantageously subtracted as an offset value.
- Such a position offset does not include a quality deviation of the code to be checked, but only the inaccuracy of the position relation used by the image processing device or camera on the one hand and the marking tool on the other hand.
- An advantageous measure for achieving a high-quality quality control is that a reference image of the corresponding surface area of the workpiece is recorded and / or evaluated before the application of a matrix code. If the surface area is recognized as too bad, for example too coarse surface texture or serious imperfections, such as cavities or mechanical damage, there is a shift to one other better surface area, which of course will also be checked again first. In this way, an unusable marking can be avoided from the outset.
- Another advantage of capturing a reference image of the material surface before the application of a matrix code is that a correlation between the reference image and the corresponding image data is carried out after the application of the matrix code in order to eliminate disruptive surface texture data.
- a correlation of the reference image with the image to be analyzed reduces differences between the actual physical-geometric properties of a marking point and its optical image created in the camera in the form of pixel patterns and is removed from the evaluation of the coding to be examined. These differences can also arise from lighting, optics, CCD sensors and signal filtering.
- Another advantageous measure for improving quality control is to capture the image data with different sharpness settings, in particular to record and correlate them at different distances between the camera and the workpiece surface. This makes it easier to filter out disruptive influences of various types.
- a further advantageous measure for improving the quality control consists in electronically using a single marking point, which has previously been taken as a picture, electronically in an "artificial" picture for correlation with the marking points to be evaluated. Positions of marking points of the code image currently to be measured are created. This "reference image" of a marking point can be created and used with different quality with regard to different features. As an alternative to this, this “reference image” may have been created by statistically averaging many marking points that were actually generated.
- the marking tool and the image processing device can advantageously be moved mechanically coupled to one another. This enables a tolerance-free alternative positioning of the image processing device or camera on the one hand and the marking tool on the other hand above the marking position of the workpiece in that both are moved by means of the same three-axis slide system.
- the tolerance-free positioning also in the Z-axis, enables a true-to-scale representation and thus also a calibratable size measurement.
- FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
- the only figure shows a perspective view Position of a marking tool attached to an adjustable holder, which is firmly connected to a camera.
- a stand 12 is arranged on a support table 10 for receiving metallic workpieces 11 to be provided with a two-dimensional matrix code, on which a holder 13 can be moved and positioned vertically by means of a motor drive 14.
- Guide grooves 15 are used to guide the stand 12 when moving in the vertical z direction.
- a carriage arrangement 16 is arranged on the holder 13, through which a marking tool 17 can be moved and positioned in the two horizontal axes (x-axis and y-axis).
- the carriage arrangement 16 consists of an x-carriage 18 for the x-direction and a y-carriage 19 for the y-direction.
- the carriages 18 and 19 each have motorized positioning drives, only the positioning drive 20 for the x-carriage 18 being recognizable in the perspective view.
- the marking tool 17 is firmly connected by means of a spacer element 21 to an image processing device designed as a camera 22, which can be designed, for example, as a CCD camera.
- An illumination device 24 is arranged around the lens 23 of the camera 22 in order to illuminate the matrix surface as well as possible.
- the lighting device 24 can also be at another location the camera 22 and / or the marking tool 17.
- the marking tool 17 has a striking tool, for example in the form of a hard metal needle 25, which, after suitable positioning, carries out striking movements against the workpiece 11 in order to produce the marking points designed as striking depressions. A large number of such marking points then forms a two-dimensional matrix code 26, the presence or absence of the marking points at the respective raster positions representing the binary-coded information.
- the motor drive 14 for the holder 13 and the slide arrangement 16 serve to position the marking tool 17 over the location to be coded on the metallic workpiece 11.
- the camera 22 is positioned over the location to be encoded, and this then records a reference image signal of the area to be encoded.
- the surface texture can be evaluated on the basis of this reference image signal, for example gray value distribution and variance.
- a threshold value assessment can be used to check whether the location provided for the marking is suitable at all, or whether, for example, the surface roughness is too great or there are serious defects, such as cavities or the like, or whether this area has significant mechanical damage, which him for a code Make marking unsuitable. If the evaluation shows that the intended location is not suitable for marking for the aforementioned reasons, a better, trouble-free marking location is sought by moving the carriage arrangement 16. The position found is then taken into account or accepted with its offset values in the marking control.
- the marking tool 17 is then moved by means of the x-slide 18 over a distance which corresponds exactly to the distance between the lens 23 of the camera 22 and the hard metal needle 25. As a result, the marking tool is positioned exactly at the point at which the camera 22 was previously positioned.
- the matrix code 26 is now generated by a sequence of striking movements of the hard metal needle 25 and movements of the slide arrangement 16. The positions of the individual matrix points are specified on the basis of stored digital position data.
- the camera 22 is then moved back into its original position by moving the x-slide 18, that is to say in a position above the matrix code 26 that is now present.
- the camera now records a test image signal.
- the surface texture of the metallic workpiece 11 that interferes with the quality check of the marking points can be hidden. This means de facto a suppression of possible interference signals by the surface texture, which would falsify the pixel information to be evaluated for the marking points.
- Illumination, optics, the camera or signal filtering can also have a disruptive impact on quality testing. Such influences can also be eliminated by such a correlation.
- the actual quality check of the marking points takes place at the locations specified by the saved coordinates. In principle, these coordinates are the same that control the marking process of the marking tool.
- the quality check can be carried out in different ways and with different efforts. Quality criteria are, for example, the area, the length, the width, the ovality, the depth, the area center and the area center of the marking points.
- the corresponding image data of the marking points are recorded on the position data and compared with stored default values.
- a quality assessment is carried out in accordance with identified deviations. This can be reproduced in detail or, in the simplest case, exceeding the maximum permissible deviations leads to optical and / or acoustic warning signals.
- the mean value of all position deviations is determined as an offset value and a corresponding correction is carried out.
- Such an offset does not represent a quality deviation of the marking points to be checked, but merely an inaccuracy of whatever kind caused by the positional relationship between camera 22 and marking tool 17.
- a swiveling movement can also take the place of the linear movement described, in order to position the marking tool 17 and the camera 22 mutually.
- a pivot axis could be arranged centrally between the marking tool 17 and the camera 22, so that the position change can be carried out in each case by a 180 ° pivoting operation.
- the camera 22 can also be motionally decoupled from the marking tool 17 and, for example, be permanently marked or have an independent movement drive. Since the recording position of the camera differs from that of the marking tool, this must be taken into account when converting the position data for the marking points. The tolerance-free positioning and true-to-scale mapping that are possible with the synchronous movement must also be electronically compensated for here.
- the image processing is for quality control with the production machine, that is combined with the marking tool.
- the main purpose is that the quality of the generated matrix codes can be guaranteed in such a way that they can be read perfectly in the later use of reading devices.
- the method according to the invention can also be carried out independently of a marking tool.
- the recording of a reference image signal and the comparison with the test image signal can also be omitted, in particular when workpieces are to be provided with a matrix code 26 which have no or only a very weak surface texture.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Multi-Process Working Machines And Systems (AREA)
- Image Processing (AREA)
- Numerical Control (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003288003A AU2003288003A1 (en) | 2003-02-28 | 2003-11-06 | Quality control method for two-dimensional matrix codes on metallic workpieces, using an image processing device |
US10/546,817 US7310566B2 (en) | 2003-02-28 | 2003-11-06 | Quality control method for two-dimensional matrix codes on metallic workpieces, using an image processing device |
DE50311160T DE50311160D1 (de) | 2003-02-28 | 2003-11-06 | Verfahren zur qualitätskontrolle von zweidimensionalen matrix-codes an metallischen werkstücken mit einem bildveratrbeitungsgerät |
EP03779855A EP1597537B1 (de) | 2003-02-28 | 2003-11-06 | Verfahren zur qualitätskontrolle von zweidimensionalen matrix-codes an metallischen werkstücken mit einem bildveratrbeitungsgerät |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10308684.6 | 2003-02-28 | ||
DE10308684A DE10308684A1 (de) | 2003-02-28 | 2003-02-28 | Verfahren zur Qualitätskontrolle von zweidimensionalen Matrix-Codes an metallischen Werkstücken mit einem Bildverarbeitungsgerät |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004076968A1 true WO2004076968A1 (de) | 2004-09-10 |
Family
ID=32842001
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/012405 WO2004076968A1 (de) | 2003-02-28 | 2003-11-06 | Verfahren zur qualitätskontrolle von zweidimensionalen matrix-codes an metallischen werkstücken mit einem bildveratrbeitungsgerät |
Country Status (6)
Country | Link |
---|---|
US (1) | US7310566B2 (de) |
EP (1) | EP1597537B1 (de) |
AT (1) | ATE422232T1 (de) |
AU (1) | AU2003288003A1 (de) |
DE (2) | DE10308684A1 (de) |
WO (1) | WO2004076968A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102423987A (zh) * | 2011-09-15 | 2012-04-25 | 深圳大宇精雕科技有限公司 | 一种玻璃面板加工精雕机及其对玻璃面板进行加工的方法 |
CN104439697A (zh) * | 2014-11-03 | 2015-03-25 | 苏州精创光学仪器有限公司 | Ccd精雕机控制系统 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005037411A1 (de) | 2005-07-12 | 2007-01-25 | Borries Markier-Systeme Gmbh | Vorrichtung und Verfahren zur Qualitätskontrolle von Markierungen |
AT507190B1 (de) * | 2008-10-20 | 2010-03-15 | Worthington Cylinders Gmbh | Verfahren zur herstellung einer stahlflasche sowie stahlflasche |
DE102011083252B9 (de) * | 2011-09-23 | 2013-01-03 | Schaeffler Technologies AG & Co. KG | Handgeführtes Beschriftungssystem |
DE102014113051A1 (de) * | 2013-09-10 | 2015-03-12 | Cognex Corp. | Drahtlose Bildverarbeitungssysteme und Verfahren zur Verwendung unter rauen Umgebungsbedingungen |
CN109186457B (zh) * | 2018-09-14 | 2021-02-12 | 天津玛特检测设备有限公司 | 一种双目的零件识别方法和装置及使用该装置的生产线 |
GB2582764A (en) * | 2019-04-01 | 2020-10-07 | Univ Dublin | Direct part marking |
CN110154564B (zh) * | 2019-06-20 | 2020-12-25 | 宋宇宁 | 一种基于互联网技术智能旅游纪念戳盖章装置 |
CN112123985A (zh) * | 2020-08-28 | 2020-12-25 | 南京雷石电子科技有限公司 | 一种电子产品生产用外壳压花装置和使用方法 |
CN114322933A (zh) * | 2021-12-28 | 2022-04-12 | 珠海市运泰利自动化设备有限公司 | 一种基于托盘倾角的视觉反馈补偿方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4230621A1 (de) * | 1992-09-12 | 1994-03-17 | Betr Forsch Inst Angew Forsch | Verfahren und Vorrichtung zum Erkennen von glühendem Halbzeug |
US6135350A (en) * | 1997-02-05 | 2000-10-24 | Northeast Robotics Llc | Surface marking system and method of viewing marking indicia |
DE19930272A1 (de) * | 1999-06-25 | 2001-01-04 | Flemming G & Pehrsson H | Verfahren und Vorrichtung zur Erzeugung einer Kennzeichnung |
US6243618B1 (en) * | 1997-10-30 | 2001-06-05 | Honda Giken Kogyo Kabushiki Kaisha | Method of marking number or the like and apparatus for marking the same |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US4072928A (en) * | 1975-10-10 | 1978-02-07 | Sangamo Weston, Inc. | Industrial system for inspecting and identifying workpieces |
US5956253A (en) * | 1997-09-09 | 1999-09-21 | Glassline Corporation | Camera controlled CNC apparatus for processing blanks |
-
2003
- 2003-02-28 DE DE10308684A patent/DE10308684A1/de not_active Withdrawn
- 2003-11-06 EP EP03779855A patent/EP1597537B1/de not_active Expired - Lifetime
- 2003-11-06 US US10/546,817 patent/US7310566B2/en not_active Expired - Fee Related
- 2003-11-06 AT AT03779855T patent/ATE422232T1/de not_active IP Right Cessation
- 2003-11-06 DE DE50311160T patent/DE50311160D1/de not_active Expired - Lifetime
- 2003-11-06 WO PCT/EP2003/012405 patent/WO2004076968A1/de not_active Application Discontinuation
- 2003-11-06 AU AU2003288003A patent/AU2003288003A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4230621A1 (de) * | 1992-09-12 | 1994-03-17 | Betr Forsch Inst Angew Forsch | Verfahren und Vorrichtung zum Erkennen von glühendem Halbzeug |
US6135350A (en) * | 1997-02-05 | 2000-10-24 | Northeast Robotics Llc | Surface marking system and method of viewing marking indicia |
US6243618B1 (en) * | 1997-10-30 | 2001-06-05 | Honda Giken Kogyo Kabushiki Kaisha | Method of marking number or the like and apparatus for marking the same |
DE19930272A1 (de) * | 1999-06-25 | 2001-01-04 | Flemming G & Pehrsson H | Verfahren und Vorrichtung zur Erzeugung einer Kennzeichnung |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102423987A (zh) * | 2011-09-15 | 2012-04-25 | 深圳大宇精雕科技有限公司 | 一种玻璃面板加工精雕机及其对玻璃面板进行加工的方法 |
CN104439697A (zh) * | 2014-11-03 | 2015-03-25 | 苏州精创光学仪器有限公司 | Ccd精雕机控制系统 |
Also Published As
Publication number | Publication date |
---|---|
ATE422232T1 (de) | 2009-02-15 |
DE50311160D1 (de) | 2009-03-19 |
AU2003288003A1 (en) | 2004-09-17 |
DE10308684A1 (de) | 2004-09-09 |
US7310566B2 (en) | 2007-12-18 |
EP1597537A1 (de) | 2005-11-23 |
EP1597537B1 (de) | 2009-02-04 |
US20060155408A1 (en) | 2006-07-13 |
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