CN103679916A - Online imprinting detection method and system - Google Patents

Online imprinting detection method and system Download PDF

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Publication number
CN103679916A
CN103679916A CN201310460465.0A CN201310460465A CN103679916A CN 103679916 A CN103679916 A CN 103679916A CN 201310460465 A CN201310460465 A CN 201310460465A CN 103679916 A CN103679916 A CN 103679916A
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China
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imprinting
detection
detecting unit
nominal value
line
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CN201310460465.0A
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Chinese (zh)
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CN103679916B (en
Inventor
贾百延
钱浩
李多慧
张锴
马金涛
张春江
何瑞
谢婕
王长宏
马玉红
张殿斌
刘南渤
孟然
付信际
张开健
华雁跃
沈子毅
徐喆
王皓
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北京印钞有限公司
上海印钞有限公司
中国印钞造币总公司
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Abstract

The invention discloses an online imprinting detection method and system. The system employs multiple colorful CCD (Charge Coupled Device) cameras and multiple parallel high-speed image collecting, operating and processing systems to detect and timely monitor printing qualities, including the front-side number printing quality, the front-side fluorescent pattern printing quality, the front and back side nominal value printing quality and the watermarking pattern printing quality (inverted note defect detection), for large RMB note products which are printed online; and the detection system emits a related command and an acousto-optic alarm signal the moment that continuous wastes or severe wastes are detected, thereby controlling an imprinting machine to stop running. Operation interfaces of different detection functions are integrated in a terminal display with a big screen for concentrated display, wherein the interfaces are clear, and operation is convenient. Number printing is the last procedure for RMB note printing, the printing quality detection after number printing can be used to verify defects detected in the previous procedures and intercept products missed in detection, thereby ensuring the quality of delivered products, and improving the production efficiency.

Description

Imprinting online test method and system
Technical field
The present invention relates to the rear quality detection technology of a kind of code, refer in particular to a kind of imprinting online test method and system.
Background technology
Number printing is last procedure that Renminbi is produced, and therefore, the printing quality of conventionally checking numbers has very strict requirement.The number printing online detection instrument of printing industry early development adopts black-white CCD camera imaging, and its accuracy of detection is not high, and measuring ability is incomplete.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of imprinting online test method and system are provided, it adopts many colorful CCD cameras and multidiameter delay high-speed image sampling and arithmetic processing system, be arranged on ink recorder, the printing defects of print product is carried out to online detection in real time.
Technical solution of the present invention is: a kind of imprinting online test method, the method adopts many color cameras and multidiameter delay high-speed image sampling and arithmetic processing system, the high-definition image that described color camera obtains is through digital image acquisition and processing, and the data after processing are comprehensively judged, detect the printing defects of this printed on line product, and send corresponding control command when finding printing defects, the method comprises:
Front number detects, and the front number printing quality of printed on line product is carried out to online detection and monitoring in real time;
Front phosphor pattern detects, and the front phosphor pattern of print product is utilized to color camera imaging, and printing quality is carried out to online detection and monitoring in real time;
Nominal value printing quality detects, and it is that the nominal value printing quality of print product is carried out to online detection and monitoring in real time; And
Watermark recovery detects, and the watermark recovery quality of print product is carried out to online detection and monitoring in real time.
Imprinting online test method as above, wherein, described nominal value printing quality detects and comprises that positive nominal value detects and back side nominal value detects, and described positive nominal value detection detects and shares same group of CCD camera and image collection processing system with front number.
Imprinting online test method as above, wherein, described online test method is applied on M81 Renminbi ink recorder, and a large Renminbi printed on line quality is carried out to real-time examination and controlling.
Imprinting online test method as above, wherein, when detecting continuous waste product or serious waste product, sends related command harmony visual alarm at once, controls ink recorder out of service.
Imprinting online test method as above, wherein, described front number detects and utilizes coloured image butted line number colour contamination to detect.
Imprinting online test method as above, wherein, described detection method also comprises image acquisition synchro control and opens greatly product systems frame synchronization and control, and this image acquisition synchro control is to utilize the outer synchronous triggering signal of image acquisition to reach the machine speed irrelevance of image acquisition and the image synchronization requirement of each camera; This opens greatly the control of product systems frame synchronization is by a large number is counted, corresponding one by one between frame signal and large opening, realize system-frame synchronous, during processing, the processing result image of current large product is tied in count value, make this count value as the numbering of current information, and the result with identical numbering is bound together, finally form the complete testing result of current large product.
An imprinting on-line detecting system, wherein, described detection system comprises a plurality of detecting units: front number detecting unit, front phosphor pattern detecting unit, nominal value printing quality detecting unit and watermark recovery detecting unit, wherein:
Described front number detecting unit, carries out online detection and monitoring in real time to the front number printing quality of printed on line product;
Described front phosphor pattern detecting unit, utilizes color camera imaging to the front phosphor pattern of print product, and printing quality is carried out to online detection and monitoring in real time;
Described nominal value printing quality detecting unit, it is that the nominal value printing quality of print product is carried out to online detection and monitoring in real time; And
Described watermark recovery detecting unit, carries out online detection and monitoring in real time for the watermark recovery quality to print product;
Each detecting unit adopts many color cameras and multidiameter delay high-speed image sampling and arithmetic processing system, the high-definition image that described color camera obtains is through digital image acquisition and processing, and the data after processing are comprehensively judged, detect the printing defects of this printed on line product, and when finding printing defects, send corresponding control command, thereby it is out of service to control ink recorder.
Imprinting on-line detecting system as above, wherein, the printing defects that described front number detecting unit detects comprises wrong number, colour contamination, bites, broken line, stain, walk the wherein a kind of or combination in any of version, knuckle.
Imprinting on-line detecting system as above, wherein, described each detecting unit comprises light source, many CCD color cameras, image acquisition and processing modules and synchronization control module, wherein, described many color cameras are under the control of the high-speed synchronous signal of described synchronization control module, printed on line product is carried out to real time image collection and processing, and by field stitching technology, realize full width face and detect.
Imprinting on-line detecting system as above, wherein, described front number detecting unit comprises light source, many CCD color cameras, parallel image acquisition process workstation, detect and control workstation, data storage server, wherein light source comprises the one or more linear light sorurces by light-source controller controls, the high-definition image that described color camera obtains completes respectively digital image acquisition and the processing of every camera through corresponding parallel image acquisition process workstation, and the data after processing are sent to and detect control workstation, by detecting control workstation, data are comprehensively judged, detect the printing defects of this printed on line product, detect control workstation and data storing is sent to corresponding control command to data storage server and when finding printing defects.
Imprinting on-line detecting system as above, wherein, described front number detecting unit also comprises a large number identification module, described large number identification module is for the identification of the large number on a large trimming edge, the thus information association in fulfillment database.
Imprinting on-line detecting system as above, wherein, described nominal value printing quality detecting unit comprises positive nominal value detecting unit and back side nominal value detecting unit, wherein, described positive nominal value detecting unit and front number detecting unit share same group of CCD color camera and image acquisition and processing module.
Imprinting on-line detecting system as above, wherein, described watermark recovery detecting unit is that the watermark recovery of single K in a large Renminbi product is detected, it comprises a CCD color camera, its light source is white light source, by high-speed image sampling and processing module, detect that watermark is touched the pillow, the incomplete printing defects of white watermark, realize the incomplete measuring ability of ticket re-selling.
Imprinting on-line detecting system as above, wherein, described detection system also comprises synchronous control unit, this synchronous control unit comprises image acquisition lock unit and opens greatly product systems frame synchronization unit, it adopts incremental rotary encoder, this code device signal is introduced camera, the outer synchronous triggering signal gathering as camera image; This image acquisition synchronous control unit utilizes the outer synchronous triggering signal of image acquisition to reach the machine speed irrelevance of image acquisition and the image synchronization requirement of each camera; This is opened greatly the control of product systems frame synchronization and is used for the unification and the binding that realize Duo Tai, organize camera quality information more.
Imprinting on-line detecting system as above, wherein, described image acquisition lock unit comprises this incremental rotary encoder and synchronizing signal controller, the output signal of synchronizing signal controller is connected with capture card, finally enters camera.
Imprinting on-line detecting system as above, wherein, described large product systems frame synchronization unit comprises this incremental rotary encoder and system-frame isochronous controller, this system-frame isochronous controller and described image and processing module couple, by being carried out to accumulated counts, encoder frames signal obtains count value, image acquisition and processing unit are tied to the processing result image of current large product on this numerical value, make this numerical value as the numbering of current information, and all results with identical numbering are bound together, the final complete testing result that forms current large product.
Imprinting on-line detecting system as above; wherein; this detection system also comprises that PLC shuts down control module and sound and light alarm module; when testing station detects the printing defects of product; by PLC, shut down control module and send halt command to ink recorder controller; and send sound and light alarm signal by sound and light alarm module, at once tackle printed on line or the undetected faulty goods of front end operation.
Imprinting on-line detecting system as above, wherein, described front number detecting unit is arranged in imprinting detection case, and the casing of described imprinting detection case is fixed on the ink recorder lining shelves of ink recorder detection cylinder below by imprinting mounting bracket; Described front phosphor pattern detecting unit and watermark recovery detecting unit are arranged in fluoroscopic examination case, and the box assembly of described fluoroscopic examination case is fixed on ink recorder lining shelves opposite side by fluorescence mounting bracket, and are positioned at described ink recorder detection cylinder below; Described back side nominal value detecting unit is arranged in the nominal value detection case of the back side, and described back side nominal value detection case is arranged on the defeated paper sprocket wheel below of described ink recorder.
Imprinting on-line detecting system as above, wherein, described back side nominal value detection case is to be arranged on the ink recorder base of defeated paper sprocket wheel below by casing installation component; On the imprinting chain road of corresponding back side nominal value detection case, be provided with airdraft plate, on airdraft plate along the microscler collection groove for collected by camera that is axially arranged with of defeated paper sprocket wheel; Described airdraft plate utilizes airdraft plate installation component to fix; The plane of airdraft plate is parallel with ink recorder Lian road, and the camera calibration line in the nominal value detection case of the back side is vertical with the plane of airdraft plate.
Imprinting on-line detecting system as above, wherein, described casing installation component comprises casing Connection Block and cabinet base, described box assembly is to be fixed together with screw and casing Connection Block, cabinet base, is then arranged on ink recorder base; And airdraft plate is to utilize existing ink recorder the first pulling shaft and ink recorder the second pulling shaft on airdraft plate installation component and ink recorder to be fixed, this airdraft plate installation component comprises the first seize, the first mounting bracket, the second seize and the second mounting bracket, the first seize, the second seize are separately fixed on ink recorder the first pulling shaft, the second pulling shaft, by the first mounting bracket, the second mounting bracket, airdraft plate are fixed.
Imprinting on-line detecting system as above, wherein, described front number detecting unit adopts five colorful CCD cameras and parallel image acquisition process workstation corresponding to five covers, realizes full width face detect by field stitching technology; Described five colorful CCD cameras are transversely arranged be arranged on visual field can the imprinting detection case of registration in, CCD camera pixel resolution reaches 0.08mm * 0.08mm/pixel, described imprinting detection case is arranged on ink recorder cylinder top, under high-speed synchronous signal controlling, to breadth, be 800mm * 600mm, print speed printing speed is that the Renminbi of 7000/hour is opened greatly product and carried out real time image collection and processing; Described front phosphor pattern detecting unit adopts 5 colorful CCD cameras transversely arranged, be arranged on visual field can the fluoroscopic examination case of registration in, detection breadth is 800mm * 600mm, every CCD camera pixel resolution reaches 0.1mm * 0.1mm/pixel, high-resolution phosphor pattern detects to expand defects detection kind, can detect phosphor pattern walk version, fluorescence intensity deviation, phosphor pattern incomplete and 10 millimeters within the scope of phosphor pattern set-off number of drawbacks; Described back side nominal value detecting unit is that nominal value printing in the back side after imprinting is carried out to full width face high resolution detection, and the pixel resolution of every CCD camera reaches 0.11mm * 0.14mm/pixel.
Imprinting four-in-one online test method of the present invention and system, preferably including the multiple printing quality such as front number printing quality, front phosphor pattern printing quality, positive nominal value printing quality, back side nominal value printing quality and watermark recovery (ticket re-selling defects detection) detects and monitors in real time, the continuous waste product of interception and seriously waste product in time, guarantee to dispatch from the factory product quality and production efficiency.
The present invention can improve online accuracy of detection and increase measuring ability, at once find printed on line product defects and the undetected product of front end operation, by operation, control continuous waste product and serious waste product are tackled, thereby reach, guarantee to dispatch from the factory product quality and the object that improves product percent of pass.
The machine vision on-line measuring device that imprinting on-line detecting system of the present invention adopts colorful CCD camera and high-speed image sampling and arithmetic processing system to form, can be arranged on M81 ink recorder, Renminbi imprinting product is carried out to real-time examination and controlling, tested large product breadth is 800mm * 600mm, and print speed printing speed is 7000/hour.Detection comprises that the multiple printing quality such as front number printing quality, front phosphor pattern printing quality, front and back nominal value printing quality and watermark recovery (ticket re-selling defects detection) detects and monitoring in real time; when finding continuous waste product and serious waste product; send in time halt command harmony visual alarm; at once tackle printed on line or the undetected faulty goods of front end operation; guarantee product quality, improve printing automation level.
Accompanying drawing explanation
Fig. 1 is the structural framing schematic diagram of the detection system of a specific embodiment of the present invention.
Figure 1A is the principle of work schematic diagram of the detection system of a specific embodiment of the present invention.
Fig. 2 is the front number detecting unit block diagram that a specific embodiment of the present invention adopts.
Fig. 3 is the phosphor pattern with background.
Fig. 4 is that the back side nominal value detecting unit computing machine that a specific embodiment of the present invention adopts is processed block diagram.
Fig. 5 is that in a specific embodiment of the present invention, image acquisition synchro system forms block diagram.
Fig. 6 is that in a specific embodiment of the present invention, a large product systems frame synchronization forms block diagram
Fig. 7 A is phosphor pattern detection case scheme of installation in a specific embodiment of the present invention.
Fig. 7 B is imprinting detection case scheme of installation in a specific embodiment of the present invention.
Fig. 7 C is nominal value detection case scheme of installation in the back side in a specific embodiment of the present invention.
Embodiment
The present invention proposes a kind of imprinting online test method, the method comprises that front number detects, adopt many color cameras and multidiameter delay high-speed image sampling and arithmetic processing system, the high-definition image that described color camera obtains is through digital image acquisition and processing, and the data after processing are comprehensively judged, detect the printing defects of this printed on line product, and when finding printing defects, send corresponding control command, thereby the front number printing quality of printed on line product is carried out to online detection and monitoring in real time.In addition, the present invention also proposes a kind of imprinting on-line detecting system, described detection system comprises more than one detecting unit, front number detecting unit for example, it is to adopt many color cameras and multidiameter delay high-speed image sampling and arithmetic processing system, and the front number printing quality of print product is carried out to online detection and monitoring in real time.
Preferably, described method or system also comprise:
Front phosphor pattern detects, and the front phosphor pattern of print product is utilized to color camera imaging, and printing quality is carried out to online detection and monitoring in real time;
Positive nominal value detects, and it is that the positive nominal value printing quality of print product is carried out to online detection and monitoring in real time;
Back side nominal value detects, and with the back side nominal value printing quality to print product, carries out online detection and monitoring in real time; And
Watermark recovery detects, and with the watermark recovery quality to print product, carries out online detection and monitoring in real time.
Shown in Fig. 1, Figure 1A, the method of the present invention and system adopt many colorful CCD cameras and multidiameter delay high-speed image sampling and arithmetic processing system, a large Renminbi product for printed on line is carried out to the multiple printing quality such as front number printing quality, front phosphor pattern printing quality, front and back nominal value printing quality and watermark recovery (ticket re-selling defects detection) to be detected and monitoring in real time, when detecting continuous waste product or serious waste product, detection system is sent related command harmony visual alarm at once, controls ink recorder out of service.Various measuring ability operation interfaces can be integrated in centralized displaying on a giant-screen terminal display, and interface is clear, easy to operate.Number printing is last procedure of Renminbi printing, and the defect that after code, printing quality detection can detect front end operation is verified and tackles undetected product, guarantees the product quality of dispatching from the factory, and enhances productivity.
Coordinate drawings and the specific embodiments to be described in further detail the specific embodiment of the present invention below.
In one specific embodiment of imprinting online test method of the present invention and system, detection system adopts colored CCD Vision Builder for Automated Inspection, by polyphaser field of view (fov) registration detection case, lighting source, Collecting Pattern and processing unit, the compositions such as synchronous control unit, the detecting unit of difference in functionality can utilize detection case to be arranged on the different detection positions of ink recorder, carry out for example front number printing quality, front phosphor pattern printing quality, front and back nominal value printing quality, the detection of dynamic of the multiple print characteristics defects such as watermark recovery (ticket re-selling defects detection), printed on line product is carried out to quality control, Figure 1A is the principle of work schematic diagram of a specific embodiment of detection method and system.
In the present embodiment, front number detecting unit comprises detecting controls workstation, data storage server, light source, color camera and corresponding parallel image acquisition process workstation, wherein, the high-definition image that described color camera obtains completes respectively digital image acquisition and the processing of every camera through corresponding image acquisition and processing workstation, and the data after processing are sent to and detect control workstation, by detecting control workstation, data are comprehensively judged, detect the printing defects of this printed on line product; Detect control workstation and data storing is sent to corresponding control command to data storage server and when finding printing defects, for example PLC controls and shuts down, or sound and light alarm.
In conjunction with above and Figure 1A, Fig. 2 known, in the present invention, each detecting unit can adopt the structure that is similar to aforementioned front number detecting unit to realize, and comprises light source, many color cameras, parallel image acquisition process workstation, detects ingredients such as controlling workstation, data storage server.
In a preferred embodiment of the present invention, this nominal value printing quality detecting unit comprises full wafer nominal value detecting unit and back side nominal value detecting unit, preferably, positive nominal value detecting unit and above-mentioned front number detecting unit share same group of colorful CCD camera and data acquisition processing system, this optimizes and combines has simplified one-piece construction greatly, save installing space, realized and utilize a detecting unit to complete the detection of two kinds of functions simultaneously, given full play to the online potentiality that detect of machine vision resource.
Fig. 2 is the block diagram of the front number detecting unit in a specific embodiment of the present invention.High-speed image sampling and processing workstation are the cores of detection system, as shown in the figure, front number detecting unit adopts 5 cover parallel image acquisition process workstations, complete respectively digital image acquisition and the processing of every colorful CCD camera, by parallel processing and optimized algorithm, within the time of 160 milliseconds, complete at a high speed collection and the calculation process of high volume data stream.Data after treatment send to testing station by gigabit Ethernet, by testing station, these are detected to data and comprehensively judge, detect front number printing wrong number, colour contamination, bite, broken line, stain, walk the printing defects such as version, knuckle.Detecting control workstation carries out data storing and sends corresponding control command; when there is continuous waste product and serious waste product; send sound and light alarm signal; by PLC, to printing machine, send halt command (detection in Fig. 2 and Fig. 4 is controlled workstation and is preferably shared workstation) simultaneously, at once tackle printed on line or the undetected faulty goods of front end operation.In Fig. 2, light source control module is mainly used in controlling light source igniting, and whether, opening greatly number identification module is the identification for the large number on a large trimming edge, for the information association of database in the power supply that CCD camera power supply control module is mainly used in controlling camera.
Light source stable, even, wide spectral range is the reliable guarantee that CCD camera obtains high signal-to-noise ratio image, and the present invention adopts line style LED light source that the transverse illumination of examined product is provided, and the heterogeneity of this light source is lower than 5%, and stability is 0.3%.Light source covers the spectral range of 480-700 nanometer, the continuously adjustable line style LED light source of illumination, and linear light sources 1 and linear light sources 2 symmetries are arranged in imprinting detection case, and transverse illumination imaging area guarantees that CCD camera obtains high-definition image.
The detection of imprinting colour contamination defect is that the black-white CCD camera detection of early stage printing industry employing is not available, and colored CCD image detection of the present invention has not only improved accuracy of detection greatly, and has increased the detectability of butted line number colour contamination.
In a specific embodiment of the present invention, this front number detecting unit adopts five colorful CCD cameras to realize full width face by field stitching technology and detects.5 colorful CCD cameras are transversely arranged be arranged on visual field can the detection case of registration in, CCD camera pixel resolution reaches 0.08mm * 0.08mm/pixel.Under high-speed synchronous signal controlling, to breadth, be 800mm * 600mm, print speed printing speed is that the Renminbi of 7000/hour is opened greatly product and carried out real time image collection and processing.
In the present embodiment, front phosphor pattern detecting unit also can adopt 5 colorful CCD cameras transversely arranged, be arranged on visual field can the fluoroscopic examination case of registration in, detection breadth is 800mm * 600mm, every CCD camera pixel resolution reaches 0.1mm * 0.1mm/pixel, high-resolution phosphor pattern detects and has expanded defects detection kind, can detect phosphor pattern walk version, fluorescence intensity deviation, phosphor pattern incomplete and 10 millimeters within the scope of the number of drawbacks such as phosphor pattern set-off, this is that original black and white phosphor pattern defects detection is beyond one's reach.Phosphor pattern belongs to burst of ultraviolel imaging, and the target acquisition zone ultraviolet illumination of the present embodiment adopts ultraviolet LED light source and white LED light source combination lighting, and phosphor pattern combination lighting light source is arranged in airtight fluoroscopic examination case.The ultraviolet light that the present embodiment adopts and this optimal design of white light combination lighting, can guarantee phosphor pattern image quality.Fig. 3 is that phosphor pattern detecting unit collects the phosphor pattern with background.
Watermark recovery detecting unit only detects the watermark recovery of single K in a large Renminbi product, adopt a CCD camera and white-light illuminating, by high-speed image sampling and disposal system, detect the printing defects such as watermark is touched the pillow, white watermark incompleteness, realize ticket re-selling measuring ability.The CCD camera of watermark recovery detecting unit and white light source are arranged in aforementioned fluoroscopic examination case, by sequestered partition light structures, realize the testing goal that same detection case completes two kinds of difference in functionalitys, this optimal combination designs simplification general structure, saved installing space.
Back side nominal value detecting unit is that back side nominal value printing defects after imprinting is detected, the faulty goods simultaneously preceding working procedure being produced is verified and is rechecked, detection breadth is 800mm * 600mm, and as shown in Figure 4, it is the system processing block diagram of back side nominal value detecting unit.Back side nominal value detecting unit adopts 4 colorful CCD cameras, by field stitching technology, detects online, and the pixel resolution of every CCD camera reaches 0.11mm * 0.14mm/pixel.Lighting source adopts has the high-brightness LED line style light source 1,2 that converges optical texture, four CCD cameras and LED light source are arranged in the nominal value detection case of the back side, back side nominal value detection case can be arranged on the defeated paper sprocket wheel of M81 ink recorder below, and detection target is opened greatly product paper and is positioned on defeated paper sprocket wheel.Back side nominal value detection case casing is positioned at the below of defeated paper sprocket wheel, and it is fixed on ink recorder base, to carry out back side nominal value quality, detects in real time.The present embodiment adopts two cover image acquisition and processing workstations to process print product back side nominal value image real-time acquisition, through high-speed computation analysis and judgement, detect the obvious or serious nominal value printing defects such as the back side offset printing of front end product, gravure, by data-carrier store, the data of testing result are stored, by detection, control workstation simultaneously and send corresponding steering order.When detecting waste product or serious waste product, control workstation and will at once send stop instruction harmony visual alarm, control ink recorder out of service, tackle in time the waste product that preceding working procedure produces.CCD camera power supply control module in Fig. 4 be power supply for controlling camera whether, light source control module is mainly used in controlling light source igniting.Preferably, data storage server herein, detect control workstation be with Fig. 2 in front number detecting unit data storage server, detect and control workstation and share.
As shown in Fig. 1, Fig. 5, Fig. 6, in one embodiment of the invention, the synchronous control unit of this detection system comprises image acquisition lock unit and opens greatly product systems frame synchronization unit.
Synchronous control unit is included in the incremental rotary encoder of installing on money press, and the resolution of scrambler is determined according to systemic resolution, generally adopted 2000 – 6000lines/r.Code device signal is introduced to camera, and no matter the outer synchronous triggering signal gathering as camera image, like this, just can guarantee can to obtain the image that resolution is even, correct by machine speed speed, reaches the machine speed irrelevance of image acquisition.
In addition, in the present embodiment, the better employing signal branch of synchronizing signal controller controller, utilizes this signal branch controller to carry out branch's control to code device signal, and Shi Yi road signal becomes the signal that multichannel has identical temporal aspect.The output signal of signal branch controller is connected with capture card, finally enters camera, please refer to shown in Fig. 5.Owing to entering the external synchronization signal of camera, be homology, so just can accomplish that the image acquisition of each camera starts simultaneously and finishes, consistent to guarantee the image between each camera, thus meet the image synchronization requirement of many cameras.
The core of above-mentioned synchronizing signal controller is the signal processing unit based on digital circuit.The balanced differential signal of this controller received code device (RS422 signal), afterwards, this differential signal is converted to non-equilibrium TTL single-ended signal, after digital isolation processing, again be converted to low-pressure balance differential signal (LVDS signal), for the image acquisition synchro control of camera.
In above-mentioned conversion, be preferably input signal and output signal are taked to electrical isolation measure, to meet the reliability and stability of the severe electrical Interference environment of industry spot hypograph synchro control.
Meanwhile, in order to meet the demand of multicamera system to Multi-path synchronous signal, in isochronous controller, for example Ke Jiang mono-road RS422 signal is converted to four road LVDS signals.Therefore, every isochronous controller can be controlled the collection synchro control of 4 cameras, but is not limited to this.
In addition, this controller also possesses signal cascade function, and that from the cascade port of controller, exports remains and input signal amplitude and the identical RS422 signal of phase place, therefore the output signal of cascade port can be used as the input signal of second isochronous controller.Like this, many isochronous controller cascades are used, and just formed perfect polyphaser, detected the image acquisition synchronous control system of station more.
In the machine vision real-time detecting system of banknote printing, all to use in most cases industry (linear array) camera to carry out line sweep detection to the product after printing, form thus a complete image.The image acquisition of camera needs trigger pip, and capture card inside possesses this trigger pip.The rising of this signal or negative edge make CCD or cmos image sensor exposure, can obtain afterwards the image of current collection.The in the situation that of paper travelling speed uniform and stable, aforesaid way can obtain desirable image.But printing machine speed change or or the unsettled situation of machine speed under, image resolution ratio will be greatly affected, and cause image stretch or compression, finally cannot use.And adopted after such scheme of the present invention, reached the machine speed irrelevance of image acquisition and the image synchronization requirement of each camera simultaneously; And for large product, because the image of many cameras of the present invention has identical reference position and identical resolution, therefore, this detection system can easily utilize a plurality of cameras product to be taken pictures, the requirement detecting to meet whole breadth simultaneously.
In the present embodiment, be to utilize existing embedded computer as system-frame isochronous controller, a large number is counted, thereby it be synchronous to realize system-frame.Owing to being one to one between encoder frames signal and large opening, therefore above-mentioned counting obtains by encoder frames signal is carried out to accumulated counts.Therefore, each product in press all can have a unique count value corresponding with this product.Embedded computer by this count value by serial ports in due course machine be sent to image acquisition and processing workstation (IPU) and detect control workstation (ICW), IPU obtains after this numerical value, the processing result image of current large product is tied on this numerical value, makes this numerical value as the numbering of current information.Each IPU is sent to ICW by current results by Ethernet afterwards, and ICW is bound together all each IPU results with identical numbering, finally forms the complete testing result of current large product, shown in Fig. 6.Like this, just Duo Tai, the unification of organizing camera quality information and binding be can realize more, from having avoided to greatest extent the binding Problem-Error of processing result image, reliable, the stable operation of on-line detecting system guaranteed.
Because the present invention has These characteristics and advantage, therefore, be applicable to being very much applied to printing quality and require high seal paper money field, be especially applicable to being applied to the imprinting detection of Renminbi.Below in conjunction with of the present invention one concrete application example, the present invention is described in further detail.
The present invention is arranged on the imprinting four-in-one on-line detecting system in above-described embodiment on the novel Renminbi ink recorder of M81, and a large Renminbi printed on line quality is carried out to real-time examination and controlling.Each detecting unit can be arranged on different detection positions on ink recorder as required, and wherein imprinting detection case assembly 10 is arranged on the side-lower (as shown in Figure 7 A) that diameter is the ink recorder detection cylinder 100 of 300 millimeters; Fluoroscopic examination box assembly 20 is arranged on the below (as shown in Figure 7 B) of above-mentioned same cylinder 100; Back side nominal value detection case 30 is arranged on the defeated paper sprocket wheel of ink recorder (as shown in Fig. 7 C).For M81 ink recorder, can directly using its impression cylinder as aforementioned detection cylinder, that is imprinting detection case assembly 10 is preferably the side-lower that is arranged on impression cylinder.
Particularly, each detecting unit of the present invention is arranged on different detection positions on ink recorder, wherein imprinting detection case assembly 10 is fixed on the side top position of ink recorder lining shelves 101 by imprinting mounting bracket 11, in the present embodiment, the angle of the CCD camera calibration line of front number detecting unit and the vertical true line of cylinders of printing press is 67 degree (being not limited to this), and camera calibration line is by the corresponding cylinder axis (as shown in Figure 7 A) of ink recorder.
Fluoroscopic examination box assembly 20 is fixed on the opposite side of printing machine lining shelves 101 by fluorescence mounting bracket 21, in the present embodiment, the angle of corresponding fluorescence camera calibration line and the xsect of cylinders of printing press is preferably 16 degree, and fluorescence camera calibration line is by the axle center (as shown in Figure 7 B) of ink recorder diameter 300mm cylinder.
The detection target of back side nominal value detection case is on defeated paper sprocket wheel 200, therefore, it need to arrange airdraft plate 39 on imprinting chain road, on airdraft plate 39 along the microscler collection groove for collected by camera that is axially arranged with of defeated paper sprocket wheel, so that the image of a large product of collected by camera airdraft plate opposite side.Installation component comprises casing installation component and airdraft plate installation component, and its box assembly 30 is first fixed together with screw and casing Connection Block 32, cabinet base 31, is then arranged on ink recorder base 201, and airdraft plate 39 is to utilize airdraft plate installation component to be fixed on ink recorder on existing ink recorder the first pulling shaft 35 and ink recorder the second pulling shaft 36, thereby realize the fixing of airdraft plate 39, this airdraft plate installation component comprises the first seize 33, the first mounting bracket 37, the second seize 34 and the second mounting bracket 38, by the first seize 33, the second seize 34 is separately fixed at ink recorder the first pulling shaft 35, on the second pulling shaft 36, by the first mounting bracket 37, the second mounting bracket 38 is fixing by airdraft plate 39, airdraft plate 39 is preferably parallel with ink recorder Lian road, and camera calibration line vertical with the plane of airdraft plate 39 (as shown in Fig. 7 C).In the present embodiment, corresponding camera calibration line and the angle of surface level are preferably 42 degree.
In above-mentioned Application Example of the present invention, CCD camera in each detection case is 7000/hour to print speed printing speed under ink recorder operation synchronizing signal is controlled, breadth is that a large Renminbi product of 800mm * 600mm carries out image acquisition and processes in real time, complete front number printing quality, front phosphor pattern printing quality, the multiple printing quality such as front and back nominal value printing quality and watermark recovery (ticket re-selling defects detection) detects and monitoring in real time, when detecting continuous waste product or serious waste product, detection system is sent related command harmony visual alarm at once, control ink recorder is out of service, at once tackle waste product or serious waste product, guarantee the product quality of dispatching from the factory.Various measuring ability operation interfaces are integrated in centralized displaying on a giant-screen terminal display, and interface is clear, easy to operate.
Although the present invention discloses with specific embodiment; but it is not in order to limit the present invention; any those skilled in the art; in the displacement that does not depart from the equivalent assemblies of having done under the prerequisite of the spirit and scope of the present invention; or the equivalent variations of doing according to scope of patent protection of the present invention and modification, all should still belong to the category that this patent is contained.

Claims (21)

1. an imprinting online test method, it is characterized in that, the method adopts many color cameras and multidiameter delay high-speed image sampling and arithmetic processing system, the high-definition image that described color camera obtains is through digital image acquisition and processing, and the data after processing are comprehensively judged, detect the printing defects of this printed on line product, and send corresponding control command when finding printing defects, the method comprises:
Front number detects, and the front number printing quality of printed on line product is carried out to online detection and monitoring in real time;
Front phosphor pattern detects, and the front phosphor pattern of print product is utilized to color camera imaging, and printing quality is carried out to online detection and monitoring in real time;
Nominal value printing quality detects, and it is that the nominal value printing quality of print product is carried out to online detection and monitoring in real time; And
Watermark recovery detects, and the watermark recovery quality of print product is carried out to online detection and monitoring in real time.
2. imprinting online test method as claimed in claim 1, it is characterized in that, described nominal value printing quality detects and comprises that positive nominal value detects and back side nominal value detects, and described positive nominal value detection detects and shares same group of CCD camera and image collection processing system with front number.
3. imprinting online test method as claimed in claim 1, is characterized in that, described online test method is applied on M81 Renminbi ink recorder, and a large Renminbi printed on line quality is carried out to real-time examination and controlling.
4. imprinting online test method as claimed in claim 1, is characterized in that, when detecting continuous waste product or serious waste product, at once sends related command harmony visual alarm, controls ink recorder out of service.
5. imprinting online test method as claimed in claim 1, is characterized in that, described front number detects and utilizes coloured image butted line number colour contamination to detect.
6. the imprinting online test method as described in claim 1 to 5 any one, it is characterized in that, described detection method also comprises image acquisition synchro control and opens greatly product systems frame synchronization and control, and this image acquisition synchro control is to utilize the outer synchronous triggering signal of image acquisition to reach the machine speed irrelevance of image acquisition and the image synchronization requirement of each camera; This opens greatly the control of product systems frame synchronization is by a large number is counted, corresponding one by one between frame signal and large opening, realize system-frame synchronous, during processing, the processing result image of current large product is tied in count value, make this count value as the numbering of current information, and the result with identical numbering is bound together, finally form the complete testing result of current large product.
7. an imprinting on-line detecting system, is characterized in that, described detection system comprises a plurality of detecting units: front number detecting unit, front phosphor pattern detecting unit, nominal value printing quality detecting unit and watermark recovery detecting unit, wherein:
Described front number detecting unit, carries out online detection and monitoring in real time to the front number printing quality of printed on line product;
Described front phosphor pattern detecting unit, utilizes color camera imaging to the front phosphor pattern of print product, and printing quality is carried out to online detection and monitoring in real time;
Described nominal value printing quality detecting unit, it is that the nominal value printing quality of print product is carried out to online detection and monitoring in real time; And
Described watermark recovery detecting unit, carries out online detection and monitoring in real time for the watermark recovery quality to print product;
Each detecting unit adopts many color cameras and multidiameter delay high-speed image sampling and arithmetic processing system, the high-definition image that described color camera obtains is through digital image acquisition and processing, and the data after processing are comprehensively judged, detect the printing defects of this printed on line product, and when finding printing defects, send corresponding control command, thereby it is out of service to control ink recorder.
8. imprinting on-line detecting system as claimed in claim 7, is characterized in that, the printing defects that described front number detecting unit detects comprises wrong number, colour contamination, bites, broken line, stain, walk the wherein a kind of or combination in any of version, knuckle.
9. imprinting on-line detecting system as claimed in claim 7, it is characterized in that, described each detecting unit comprises light source, many CCD color cameras, image acquisition and processing modules and synchronization control module, wherein, described many color cameras are under the control of the high-speed synchronous signal of described synchronization control module, printed on line product is carried out to real time image collection and processing, and by field stitching technology, realize full width face and detect.
10. imprinting on-line detecting system as claimed in claim 9, it is characterized in that, described front number detecting unit comprises light source, many CCD color cameras, parallel image acquisition process workstation, detect and control workstation, data storage server, wherein light source comprises the one or more linear light sorurces by light-source controller controls, the high-definition image that described color camera obtains completes respectively digital image acquisition and the processing of every camera through corresponding parallel image acquisition process workstation, and the data after processing are sent to and detect control workstation, by detecting control workstation, data are comprehensively judged, detect the printing defects of this printed on line product, detect control workstation and data storing is sent to corresponding control command to data storage server and when finding printing defects.
11. imprinting on-line detecting systems as claimed in claim 10, it is characterized in that, described front number detecting unit also comprises a large number identification module, and described large number identification module is for the identification of the large number on a large trimming edge, the thus information association in fulfillment database.
12. imprinting on-line detecting systems as claimed in claim 9, it is characterized in that, described nominal value printing quality detecting unit comprises positive nominal value detecting unit and back side nominal value detecting unit, wherein, described positive nominal value detecting unit and front number detecting unit share same group of CCD color camera and image acquisition and processing module.
13. imprinting on-line detecting systems as claimed in claim 12, it is characterized in that, described watermark recovery detecting unit is that the watermark recovery of single K in a large Renminbi product is detected, it comprises a CCD color camera, its light source is white light source, by high-speed image sampling and processing module, detect that watermark is touched the pillow, the incomplete printing defects of white watermark, realize the incomplete measuring ability of ticket re-selling.
14. imprinting on-line detecting systems as claimed in claim 7, it is characterized in that, described detection system also comprises synchronous control unit, this synchronous control unit comprises image acquisition lock unit and opens greatly product systems frame synchronization unit, it adopts incremental rotary encoder, this code device signal is introduced camera, the outer synchronous triggering signal gathering as camera image; This image acquisition synchronous control unit utilizes the outer synchronous triggering signal of image acquisition to reach the machine speed irrelevance of image acquisition and the image synchronization requirement of each camera; This is opened greatly the control of product systems frame synchronization and is used for the unification and the binding that realize Duo Tai, organize camera quality information more.
15. imprinting on-line detecting systems as claimed in claim 14, is characterized in that, described image acquisition lock unit comprises this incremental rotary encoder and synchronizing signal controller, and the output signal of synchronizing signal controller is connected with capture card, finally enters camera.
16. imprinting on-line detecting systems as claimed in claim 15, it is characterized in that, described large product systems frame synchronization unit comprises this incremental rotary encoder and system-frame isochronous controller, this system-frame isochronous controller and described image and processing module couple, by being carried out to accumulated counts, encoder frames signal obtains count value, image acquisition and processing unit are tied to the processing result image of current large product on this numerical value, make this numerical value as the numbering of current information, and all results with identical numbering are bound together, the final complete testing result that forms current large product.
17. imprinting on-line detecting systems as described in claim 7~16 any one; it is characterized in that; this detection system also comprises that PLC shuts down control module and sound and light alarm module; when testing station detects the printing defects of product; by PLC, shut down control module and send halt command to ink recorder controller; and send sound and light alarm signal by sound and light alarm module, at once tackle printed on line or the undetected faulty goods of front end operation.
18. imprinting on-line detecting systems as described in claim 7~16 any one, it is characterized in that, described front number detecting unit is arranged in imprinting detection case, and the casing of described imprinting detection case is fixed on the ink recorder lining shelves of ink recorder detection cylinder below by imprinting mounting bracket; Described front phosphor pattern detecting unit and watermark recovery detecting unit are arranged in fluoroscopic examination case, and the box assembly of described fluoroscopic examination case is fixed on ink recorder lining shelves opposite side by fluorescence mounting bracket, and are positioned at described ink recorder detection cylinder below; Described back side nominal value detecting unit is arranged in the nominal value detection case of the back side, and described back side nominal value detection case is arranged on the defeated paper sprocket wheel below of described ink recorder.
19. imprinting on-line detecting systems as claimed in claim 18, is characterized in that, described back side nominal value detection case is to be arranged on the ink recorder base of defeated paper sprocket wheel below by casing installation component; On the imprinting chain road of corresponding back side nominal value detection case, be provided with airdraft plate, on airdraft plate along the microscler collection groove for collected by camera that is axially arranged with of defeated paper sprocket wheel; Described airdraft plate utilizes airdraft plate installation component to fix; The plane of airdraft plate is parallel with ink recorder Lian road, and the camera calibration line in the nominal value detection case of the back side is vertical with the plane of airdraft plate.
20. imprinting on-line detecting systems as claimed in claim 19, it is characterized in that, described casing installation component comprises casing Connection Block and cabinet base, and described box assembly is to be fixed together with screw and casing Connection Block, cabinet base, is then arranged on ink recorder base; And airdraft plate is to utilize existing ink recorder the first pulling shaft and ink recorder the second pulling shaft on airdraft plate installation component and ink recorder to be fixed, this airdraft plate installation component comprises the first seize, the first mounting bracket, the second seize and the second mounting bracket, the first seize, the second seize are separately fixed on ink recorder the first pulling shaft, the second pulling shaft, by the first mounting bracket, the second mounting bracket, airdraft plate are fixed.
21. imprinting on-line detecting systems as described in claim 7~16 any one, it is characterized in that, described front number detecting unit adopts five colorful CCD cameras and parallel image acquisition process workstation corresponding to five covers, realizes full width face detect by field stitching technology; Described five colorful CCD cameras are transversely arranged be arranged on visual field can the imprinting detection case of registration in, CCD camera pixel resolution reaches 0.08mm * 0.08mm/pixel, described imprinting detection case is arranged on ink recorder cylinder top, under high-speed synchronous signal controlling, to breadth, be 800mm * 600mm, print speed printing speed is that the Renminbi of 7000/hour is opened greatly product and carried out real time image collection and processing; Described front phosphor pattern detecting unit adopts 5 colorful CCD cameras transversely arranged, be arranged on visual field can the fluoroscopic examination case of registration in, detection breadth is 800mm * 600mm, every CCD camera pixel resolution reaches 0.1mm * 0.1mm/pixel, high-resolution phosphor pattern detects to expand defects detection kind, can detect phosphor pattern walk version, fluorescence intensity deviation, phosphor pattern incomplete and 10 millimeters within the scope of phosphor pattern set-off number of drawbacks; Described back side nominal value detecting unit is that nominal value printing in the back side after imprinting is carried out to full width face high resolution detection, and the pixel resolution of every CCD camera reaches 0.11mm * 0.14mm/pixel.
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