CN101804720A - Vision-based online digital electronic engraving quality monitoring method and device - Google Patents
Vision-based online digital electronic engraving quality monitoring method and device Download PDFInfo
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Abstract
The invention provides a vision-based online digital electronic engraving quality monitoring method and a vision-based online digital electronic engraving quality monitoring device. In the invention, the size, volume, surface roughness and three-dimensional image feature parameter of an ink cell on the roller are obtained by a binocular machine in the three-dimensional visual manner and by the projection transformation technology, wavelet de-noising analysis technology, CLAHE image enhancement technology, grey-level normalization technology, sub-pixel accuracy threshold processing technology, SIFT feature matching technology, improved seed growth method, dynamic programming matching technology and three-dimensional imaging technology in real time; and by comparing the parameters with the standard parameters, the motion state and working parameters of the electronic engraving machine are adjusted, and the motion error compensation is performed so as to realize online electronic engraving quality monitoring. Moreover, the invention also provides an online monitoring device characterized by simple structure, low cost, and accurate and high-efficiency multi-communication modes for realizing automatic trial engraving of the electronic engraving machine.
Description
Technical field
The present invention relates to electronic engraving quality detection method and device in a kind of printing industry, relate to a kind of online digital electronic engraving quality monitoring method and device especially based on vision.
Background technology
Printing is contained wide spectrums such as packaging for foodstuff, people's leather, cigarette package, building household ornament materials, flooring material, cloth as modern processing service industry, and the construction and the development and national economy of China's spiritual civilization played crucial impetus.Development along with electronic engraving machine, intaglio printing as one of four big mode of printings has obtained significant raising in the status of press, and the plate-making quality of intaglio printing mainly shows the 3 dimensional coil geometry of ink cell, the fineness on surface and the spatial distribution of ink cell, because ink cell often is non-regular shape, there are many difficult points in its automatic measurement, the detection method of engrave quality at present adopts the mode of artificial naked eyes interpretation and uses the ink cell depth calibrator, wherein manual detection can bring artificial subjective factor to increase unavoidably, operator's skills and experience is required high and is difficult to realize deficiency such as on-line monitoring, and the ink cell depth calibrator can only the offline inspection ink cell degree of depth, is difficult to be implemented in the line mass monitoring.Therefore, in order to guarantee electronic engraving high-quality and high efficiency, need one to overlap quality online monitoring system fast and accurately.
Summary of the invention
The present invention seeks at the deficiencies in the prior art, a kind of digital electronic engraving quality plate-making on-line monitoring method and apparatus based on vision is provided, utilize the binocular machine vision technology, obtain the size of ink cell on the roller in real time, volume, surface roughness, 3-D view characterisitic parameter, the running status of on-line monitoring electronic engraving machine.
The present invention is achieved through the following technical solutions:
One, a kind of online digital electronic engraving quality monitoring method based on vision:
Ink cell image on the lower roller of online acquisition double vision angle, by utilization projective transformation technology, the wavelet noise technology, the CLAHE image enhancement technique, the gray scale normalization technology, sub-pixel precision threshold process technology, SIFT characteristic matching technology, improved seed growth method, the Dynamic Programming matching technique, the three-dimensional imaging technology is obtained the size of ink cell on the roller in real time, volume, surface roughness, the 3-D view characterisitic parameter, difference according to characterisitic parameter, adopt different communication modes to be transferred to the motion control center through corresponding communication bus, pass through the comparison of these parameters and canonical parameter again, adjust electronic engraving machine motion state and running parameter and carry out the kinematic error compensation, realize the on-line monitoring electronic engraving quality.
Two, a kind of online digital electronic engraving quality monitoring device based on vision:
It is formed by the ink cell imaging device with based on online quality evaluation module two parts of ink cell image information; Wherein, the ink cell imaging device comprises the spring shockproof sheet, follower, and right base, right montant, the right folder that connects, focus adjusting mechanism, right CMOS camera, left CMOS camera, Stereo microscope, cross bar, a left side connects folder, left montant, left base, spring shockproof sheet; Left side base and right base are fixed on the both sides of follower end face engraving member respectively by spring shockproof sheet separately; Left side montant and right montant bottom are separately fixed on left base and the right base, a left side connects folder and is enclosed within respectively in the left and right montant with a right end that is connected folder, a left side connects folder and is connected the two ends that the other end that presss from both sides is installed in cross bar with the right side, the focus adjusting mechanism that can regulate the Stereo microscope focal length is installed on the cross bar, a left side CMOS camera and right CMOS camera are installed in respectively on the eyepiece stalk of Stereo microscope, and left CMOS camera and right CMOS camera are connected with online quality evaluation module based on the ink cell image information by holding wire respectively.
Described online quality evaluation module based on the ink cell image information comprises the embedded quality evaluation center based on double-core ADSP Blacfin561, PXI Communication Control center, CAN Communication Control center, USB Communication Control center, LCDs; Based on the embedded quality evaluation center of double-core ADSP Blacfin 561 respectively with PXI Communication Control center, CAN Communication Control center, USB Communication Control center, LCDs is connected through corresponding data wires with two CMOS cameras.
Described embedded quality evaluation center based on double-core ADSP Blacfin 561 comprises IMAQ control submodule and image processing sub.
The beneficial effect that the present invention has is:
The present invention utilizes the technology of binocular machine vision, the examination carving process of on-line monitoring electronic engraving machine, detect the quality of gravure plating in real time, accurately, automatic and standard quality requires to compare, and realizes the adjustment and the kinematic error compensation of electronic engraving machine motion state and running parameter.Provide simultaneously a kind of simple in structure, cost is lower and many accurately and efficiently communication modes and the on-line monitoring device deposited, realizes the automation examination carving of electronic engraving machine.
Description of drawings
Fig. 1 is based on the online digital electronic engraving quality monitoring device scheme of installation of vision.
Fig. 2 is based on the online digital electronic engraving quality monitoring apparatus structure schematic diagram of vision.
Fig. 3 is based on the online quality evaluation module principle block diagram of ink cell image information.
Fig. 4 is an IMAQ submodule theory diagram.
Fig. 5 is a USB control submodule theory diagram.
Fig. 6 is a CAN control submodule theory diagram.
Fig. 7 is a PXI control submodule theory diagram.
Fig. 8 is the flow chart of image processing module.
Fig. 9 is that the ink cell surface roughness is calculated the layering schematic diagram.
Figure 10 is the enlarged diagram of overlooking of ink cell i layer.
Among the figure: 1, spring shockproof sheet, 2, follower, 3, right base, 4, right montant, 5, the right folder that connects, 6, focus adjusting mechanism, 7, right CMOS camera, 8, left CMOS camera, 9, Stereo microscope, 10, cross bar, 11, roller, 12, a left side connects folder, 13, left montant, 14, left base, 15, the spring shockproof sheet, 16, engraving member.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
In Fig. 1 and Fig. 2, form by the ink cell imaging device with based on online quality evaluation module two parts of ink cell image information based on the online digital electronic engraving quality monitoring device of vision; Wherein, the ink cell imaging device comprises spring shockproof sheet 1, follower 2, right base 3, right montant 4, right folder 5, focus adjusting mechanism 6, right CMOS camera 7, left CMOS camera 8, the Stereo microscope 9 of connecting, cross bar 10, a left side connects folder 12, left montant 13, left base 14, spring shockproof sheet 15; Left side base 14 and right base 3 are fixed on the both sides of follower 2 end face engraving members 16 respectively by spring shockproof sheet 15,1 separately; Left side montant 13 and right montant 4 bottoms are separately fixed on left base 14 and the right base 3, a left side connects folder 12 and is enclosed within respectively in the left and right montant 13,4 with a right end that is connected folder 5, a left side connects folder 12 and right the connection pressed from both sides the two ends that 5 the other end is installed in cross bar 10, the focus adjusting mechanism 6 that can regulate Stereo microscope 9 focal lengths is installed on the cross bar 10, a left side CMOS camera 8 and right CMOS camera 7 are installed in respectively on the eyepiece stalk of Stereo microscope 6, and left CMOS camera 8 and right CMOS camera 7 are connected with online quality evaluation module based on the ink cell image information by holding wire respectively.
Among Fig. 3, described online quality evaluation module based on the ink cell image information, comprise embedded quality evaluation center based on double-core ADSPBlacfin 561, PXI Communication Control submodule, CAN Communication Control submodule, USB Communication Control submodule, LCDs, the PXI communication interface, CAN communication interface, USB communication interface; Based on the embedded quality evaluation center of double-core ADSP Blacfin 561 respectively with PXI Communication Control submodule, CAN Communication Control submodule, USB Communication Control submodule, LCDs is connected through corresponding data wires with two CMOS cameras.Described embedded quality evaluation center based on double-core ADSP Blacfin 561 comprises IMAQ control submodule and image processing sub.The left and right sides view of ink cell controls left CMOS camera by IMAQ control submodule respectively and right CMOS camera collection obtains.In the focusing process before the examination carving, the video image that left and right sides camera is taken directly is transferred to LCDs and shows.
Fig. 4 has shown the annexation of IMAQ control submodule and left and right sides CMOS camera, after left and right sides MT9P031CMOS chip obtains the TRIGGER signal of ADSP Blacfin 561 simultaneously, trigger to take the left and right sides view of synchronization, then pass to ADSP Blacfin 561 corresponding row signal LINE, frame signal FRAME, clock signal C LOCK and 12 s' data-signal D[0-12] realize the transmission of ink cell image.After ADSP Blacfin 561 received the ink cell view data, image processing module carried out corresponding ink cell image and handles and analyze.According to the difference as a result after analyzing, be transferred on the corresponding bus through corresponding communication interface by USB communication modes, PXI communication modes, three kinds of different communication modes of CAN communication modes.
Among Fig. 5, USB Communication Control submodule mainly comprises the ISP1581USB control chip, on the ISP1581USB control chip /CS ,/RD ,/WR, INT, AD0, AD＜1-7, DATA＜0-15 interface respectively with ADSP BF-561 /AMS1 ,/AOE ,/AWE, PF3 ,/ABE3, A＜2-8, D＜0-15 be connected, the USBD-on the ISP1581USB control chip is connected with the USB communication interface with USBD+.The direction of arrow is represented the direction of signal transmission among the figure.
CAN Communication Control submodule mainly comprises the SJA1000CAN control chip among Fig. 6, two 6N137 photoelectrical couplers and TJA1040 converter.AD＜the 0-7 of SJA1000CAN control chip 〉, INT, WR, RD, CS respectively with D＜0-7 of ADSP-BF561, PF4 ,/AWE ,/AOE ,/AMS2 is connected, the input/output port RXD0 of SJA1000CAN control chip links to each other with the 6N137 optocoupler respectively with TXD0, the two ends in addition of 6N137 optocoupler connect the TJA1040 converter, and the CH on the TJA1040 converter is connected with the CAN communication interface with CL.The direction of arrow is represented the direction of signal transmission among the figure.
PXI Communication Control submodule mainly comprises the CY7C09449 control chip among Fig. 7, the BE#[3 of CY7C09449 control chip], ADR＜2:14, DQ＜0:15, RDY_OUT#, READ#, WRITE#, SELECT# respectively with AD＜2 of ADSP-BF561, AD＜3:16, D＜0:15, READ ,/AOE ,/AWE ,/AMS3 is connected the AD＜0:31 of CY7C09449 control chip, C/BE[0:3], PAR, FRAME#, IRDY#, TRDY#, STOP#, IDSEL#, DEVSEL#, REQ#, GNT#, PEAR#, SERR#, NTA# link to each other with the PXI interface.The direction of arrow is represented the direction of signal transmission among the figure.
The flow chart of image processing module among Fig. 8, after obtaining left and right sides view, different according to the characterisitic parameter that calculates, be divided into three flow processs, calculate the ink cell area, carry out perspective geometry conversion, wavelet noise processing, CLAHE figure image intensifying, gray scale normalization, sub-pix threshold process, treatment of details, calculating ink cell image area, conversion successively with the imaginary circles of area, the real radius of calculating imaginary circles; Extracting the ink cell profile carries out perspective geometry conversion, wavelet noise processing, limited adaptive histogram equalization (CLAHE) figure image intensifying, gray scale normalization, sub-pix threshold process, treatment of details, Canny edge extracting, template matches identification successively, judges the ink cell profile; Calculating ink cell volume and surface roughness carries out perspective geometry conversion, wavelet noise processing, CLAHE figure image intensifying, gray scale normalization, Fusiollo method image rectification successively, extracts SIFT characteristic point, improved seed growth method, segmentation Dynamic Programming coupling, trigonometric ratio mensuration, intensive reconstruct method, acquisition three-dimensional image information, calculating ink cell volume and surface roughness.After obtaining the characterisitic parameter of ink cell, compare, by engraving motion control center adjustment engraving motion state with the standard feature parameter.
What Fig. 9 showed is the three-dimensional layering schematic diagram of ink cell, in the gauging surface roughness, ink cell is divided into nlevel (n 〉=10) at depth direction.
What Figure 10 showed is the enlarged diagram of overlooking of i layer, by seeking decentre axle point farthest and the nearest point above this layer, calculates solstics and closest approach distance values d
i
Unit Installation and focusing process: before the examination carving, at first the mounting means according to Fig. 1 is fixed to the online digital electronic engraving quality monitoring device based on vision on the follower 2 of electronic engraving machine, then connect folder 12 and the right adjusting lifting cross bar that is connected folder 5 by a left side, make cross bar a little more than engraving member 16, adjust the angle of Stereo microscope 9 by focus adjusting mechanism 6, make the center of the object lens central axial alignment detection ink cell of Stereo microscope 9, regulate focus adjusting mechanism 6 and focus for Stereo microscope 9, in LCDs, occur clearly till the ink cell image.Finely tune the angle of Stereo microscope 9 and the position of cross bar 10 again, make the field range of left and right sides CMOS camera comprise whole ink cell.
The flow process that image processing module is realized: before the monitoring, at first adopt scaling method to carry out the demarcation of left and right sides camera inside and outside parameter based on amblyopia differential mode type; After beginning the examination carving, after single ink cell engraving finishes, triggering left and right sides CMOS camera exposure simultaneously based in the heart IMAQ control centre in the embedded quality evaluation of double-core ADSP Blacfin 561 takes, obtain the left and right sides view of ink cell under the synchronization, adopt the projective transformation technology that the target ink cell in the view of the left and right sides is carried out geometric transformation again, ink cell image under the elimination perspective distortion obtains facing, then carry out corresponding Wavelet image de-noising successively, CLAHE figure image intensifying, gray scale normalization, the sub-pixel precision threshold process, treatment of details extracts the binary image of target ink cell, calculate the image area of ink cell, be converted to imaginary circles with area, and calculate the radius R of imaginary circles in conjunction with calibrating parameters, according to the ink cell imaginary circles radius R that detects and the comparison of standard value, the size Selection of judging engraving member whether correctly and carving depth whether excessive.Adopt the Canny edge detection method to extract the appearance profile of ink cell simultaneously, by the template matches recognition technology, whether be circular, send the ink cell deformation parameter for the motion control center by the CAN communication modes again if judging ink cell, adjust the kinematic parameter of engraving member and roller correspondence.Then adopt the Fusiello method that left and right sides view is carried out image rectification according to outer polar curve standard geometry, make the outer polar curve of left and right sides view be parallel to horizontal direction, utilize the polar curve constraint, continuity constraint, constraints and SIFT characteristic matching technology such as unique constraints, extract the SIFT characteristic point of mating in the view of the left and right sides, again with these SIFT characteristic points as seed, adopt improved seed growth method and segmentation dynamic programming carry out from sparse to dense two the step three-dimensional matching strategy, obtain the corresponding matching relationship of every bit on the ink cell, in conjunction with calibrating parameters, the triangulation of employing principle of parallax calculates the D coordinates value of ink cell each point, adopts intensive reconstruct method to reappear the 3-D view of ink cell at last.By the analyzing three-dimensional image information, obtain the degree of depth h of ink cell, according to circular cone computing formula V=(1/3) π R
2H calculates the volume of ink cell; Then three-dimensional ink cell is divided into n layer (n 〉=10) by depth direction, it is last from the ink cell central shaft recently and the solstics to seek each layer i, and getting its difference is d
i, according to the definition of unequal 10 height of the assessment parameters microcosmic of surface roughness,
Then reflect the surface roughness of ink cell.Compare with actual required standard value again, adjust the carving depth and the dynamics of engraving member.Simultaneously, the video image of acquisition passes on the host computer by the PXI communication modes and preserves, and the adjustment scheme of discrepancy report and kinematic parameter passes to host computer so that check by the CAN communication modes.
Claims (4)
1. online digital electronic engraving quality monitoring method based on vision, it is characterized in that: the ink cell image on the lower roller of online acquisition double vision angle, by utilization projective transformation technology, the wavelet noise technology, the CLAHE image enhancement technique, the gray scale normalization technology, sub-pixel precision threshold process technology, SIFT characteristic matching technology, improved seed growth method, the Dynamic Programming matching technique, the three-dimensional imaging technology is obtained the size of ink cell on the roller in real time, volume, surface roughness, the 3-D view characterisitic parameter, difference according to characterisitic parameter, adopt different communication modes to be transferred to the motion control center through corresponding communication bus, pass through the comparison of these parameters and canonical parameter again, adjust electronic engraving machine motion state and running parameter and carry out the kinematic error compensation, realize the on-line monitoring electronic engraving quality.
2. a kind of online digital electronic engraving quality monitoring device of implementing the described method of claim 1 based on vision, it is characterized in that: it is formed by the ink cell imaging device with based on online quality evaluation module two parts of ink cell image information; Wherein, the ink cell imaging device comprises spring shockproof sheet (1), follower (2), right base (3), right montant (4), the right folder (5) that connects, focus adjusting mechanism (6), right CMOS camera (7), left CMOS camera (8), Stereo microscope (9), cross bar (10), a left side connects folder (12), left montant (13), left side base (14), spring shockproof sheet (15); Left side base (14) and right base (3) are fixed on the both sides of follower (2) end face engraving member (16) respectively by spring shockproof sheet (15,1) separately; Left side montant (13) and right montant (4) bottom are separately fixed on left base (14) and the right base (3), a left side connects folder (12) and is enclosed within a left side respectively with a right end that is connected folder (5), right montant (13,4) in, a left side connects the two ends that the other end that folder (12) and the right side be connected folder (5) is installed in cross bar (10), cross bar (10) is gone up the focus adjusting mechanism (6) that installation can be regulated Stereo microscope (9) focal length, a left side CMOS camera (8) and right CMOS camera (7) are installed in respectively on the eyepiece stalk of Stereo microscope (6), and left CMOS camera (8) and right CMOS camera (7) are connected with online quality evaluation module based on the ink cell image information by holding wire respectively.
3. a kind of online digital electronic engraving quality monitoring device according to claim 2 based on vision, it is characterized in that: described online quality evaluation module based on the ink cell image information, comprise embedded quality evaluation center based on double-core ADSP Blacfin 561, PXI Communication Control center, CAN Communication Control center, USB Communication Control center, LCDs; Based on the embedded quality evaluation center of double-core ADSP Blacfin 561 respectively with PXI Communication Control center, CAN Communication Control center, USB Communication Control center, LCDs is connected through corresponding data wires with two CMOS cameras.
4. a kind of online digital electronic engraving quality monitoring device according to claim 3 based on vision, it is characterized in that: described embedded quality evaluation center based on double-core ADSP Blacfin 561 comprises IMAQ control submodule and image processing sub.
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| CN106767564A (en) * | 2016-11-03 | 2017-05-31 | 广东工业大学 | A kind of detection method for being applied to phone housing surface roughness |
| CN108168454A (en) * | 2017-11-28 | 2018-06-15 | 华侨大学 | For measuring method of the measuring device of sea cave depth with measuring sea cave depth |
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| CN106767564A (en) * | 2016-11-03 | 2017-05-31 | 广东工业大学 | A kind of detection method for being applied to phone housing surface roughness |
| CN108168454A (en) * | 2017-11-28 | 2018-06-15 | 华侨大学 | For measuring method of the measuring device of sea cave depth with measuring sea cave depth |
| CN109000561A (en) * | 2018-07-09 | 2018-12-14 | 华侨大学 | For measuring the measuring device and its measurement method of sea cave volume |
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| CN110827307B (en) * | 2019-11-04 | 2022-04-15 | 深圳技术大学 | High-precision image pixel distance measuring method for electronic engraving machine |
| CN111722584A (en) * | 2020-05-28 | 2020-09-29 | 固高科技(深圳)有限公司 | Fast knife servo system, electric carving system and electric carving control method |
| CN111812090A (en) * | 2020-06-19 | 2020-10-23 | 固高科技(深圳)有限公司 | Detection method, device, electric carving control system and computer readable storage medium |
| CN111806059A (en) * | 2020-06-19 | 2020-10-23 | 固高科技(深圳)有限公司 | Driving method, apparatus, electric carving control system and computer readable storage medium |
| CN111907191A (en) * | 2020-06-19 | 2020-11-10 | 固高科技(深圳)有限公司 | Compensation method, compensation device, electrographic engraving control system and computer-readable storage medium |
| CN111907189A (en) * | 2020-06-19 | 2020-11-10 | 固高科技(深圳)有限公司 | Calibration method, calibration device, electronic carving control system and computer-readable storage medium |
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| CN111791574A (en) * | 2020-06-19 | 2020-10-20 | 固高科技(深圳)有限公司 | Electric carving equipment and detection method |
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| CN112455061B (en) * | 2020-11-23 | 2022-07-29 | 固高科技股份有限公司 | Machine vision-based electric carving driving method and device and electric carving control system |
| CN112872604A (en) * | 2021-02-01 | 2021-06-01 | 林元霞 | Intelligent intaglio roller engraving system based on Internet of things |
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