CN103499587A - High-speed paper defect detecting system based on Camera Link interface - Google Patents
High-speed paper defect detecting system based on Camera Link interface Download PDFInfo
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- CN103499587A CN103499587A CN201310489524.7A CN201310489524A CN103499587A CN 103499587 A CN103499587 A CN 103499587A CN 201310489524 A CN201310489524 A CN 201310489524A CN 103499587 A CN103499587 A CN 103499587A
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Abstract
The invention relates to a paper defect detecting system, in particular to a high-speed paper defect detecting system based on a Camera Link interface. The paper defect detecting system comprises an image acquisition module, an image processing module and a display module. The image acquisition module is used for acquiring image number. The image processing module is used for detecting paper defects by means of image segmenting and the like through a FPGA (field programmable gate array) and a DSP (digital signal processor). The display module is used for checking paper images in real time, setting parameters, and displaying paper images on an upper computer. The image acquisition module is communicated with the image processing module through the Camera Link interface. The acquisition module is composed of CCD (charge coupled device) linear arrays. The paper defect detecting system is fast in data transmission.
Description
(1) technical field
The present invention relates to a kind of web inspection system, particularly the high speed web inspection system based on Camera Link interface.
(2) background technology
The surface imperfection of paper is the key factor that affects paper quality, and surperficial paper defects detects for improving quality of finished paper has very important effect.Along with the raising of modern paper technology, paper machine speed also improves constantly, and paper is faced with the risk of the more defects of appearance, and it is unrealistic that artificial naked eyes detect paper defect, web inspection system therefore occurred.
Web inspection system, WIS(Web Inspection System) be one of widely accepted paper-making process detection system at present, it can provide to the production run of paper and cardboard comprehensive supervision and measurement.The ULMA product of ABB company is online paper web detection system the earliest.At the initial stage seventies, it adopts photoelectric crystal tube sensor, infrared light light source and additional output alarm signal and driving color marker and printer.The main limitation of this system is that it can not detect trimming (trimming breach) and continuous paper defects can not be detected as pleat and scratch etc.Only to simple paper defects, can detect, as eye, spot etc.
First domestic web inspection system is the SYWIS3000 paper defects detect and select system that double base company of Zhejiang University releases in 2004 annual proper motion exploitations, and the said firm has released again the SYWIS3200 web inspection system subsequently.Current domestic field of papermaking is all to use these two kinds of web inspection systems basically, take SYWIS3000 as example, and gamma camera CCD linear array is lined by line scan to paper web, by data, processes and generates real-time detection of dynamic image.The length of the scanning area of every gamma camera is approximately 800 millimeters, and the striped of record comprises 2,000 images.Reading speed 20,000 times/second, the vertical paper defects detected magnitude of paper machine can reach 0.3-2.0 millimeter (depending on paper motor speed and camera number).But along with the raising of modern paper technology and the modern life, the production requirement growing to paper quality, needing detected paper surface defect kind to get more and more also becomes increasingly complex, this just means that the paper defects detection algorithm becomes increasingly complex, the data volume of transmission is increasing, and this also causes existing web inspection system data transmission more and more slower.
(3) summary of the invention
The present invention, in order to make up the defect of prior art, provides the fast high speed paper defects based on Camera Link interface of a kind of transmission speed to detect.
The present invention is achieved through the following technical solutions:
High speed web inspection system based on Camera Link interface, is characterized in that, comprising:
Image capture module: be responsible for gathering picture number from the paper machine;
Image processing module: completed by FPGA+DSP, be responsible for the processing such as cutting apart by image paper defects is detected;
Display module; For the line parameter setting of going forward side by side of real time inspection paper image, be responsible for carrying out at host computer the demonstration of paper image;
Wherein between image capture module and image processing module, adopt Camera Link interface to communicate.
Described image capture module is comprised of the CCD line-scan digital camera.
The invention has the beneficial effects as follows:
(1) the present invention detects Camera Link interface for quick paper defects.Traditional LVDS interface peak transfer rate is 655MBits/s, and Channel Link interface is the highest also can only reach 1.8GBits/s.The Camera Link interface that the present invention uses is under Full Camera Link configuration mode, and its peak transfer rate can reach 4.8Gbits/s, far above conventional transmission modes such as Channel Link and LVDS.Nowadays it not only can meet the large-scale data transmission in web inspection system fast, and have certain extendability.In fact, this Interface Expanding Channel Link technology, the closed specification of vision application is provided.
(2), according to application requirements occasion difference, Camera Link provides (Base), middle-grade (Medium), whole (Full) etc. substantially to support form, can freely select according to resolution, speed etc.
(4) accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is basic structure schematic diagram of the present invention;
Fig. 2 is the standard 3M SDR of company attachment unit interface schematic diagram;
Fig. 3 is the standard 3M SDR of company connector pinout schematic diagram;
The hardware that Fig. 4 is Camera Link connects block diagram;
Fig. 5 is Base Camera Link pattern diagram.
(5) embodiment
Accompanying drawing is specific embodiments of the invention.The high speed web inspection system of this kind based on Camera Link interface comprises:
Image capture module: formed by the CCD line-scan digital camera, be responsible for gathering picture number from the paper machine;
Image processing module: completed by FPGA+DSP, be responsible for the processing such as cutting apart by image paper defects is detected;
Display module; For the line parameter setting of going forward side by side of real time inspection paper image, be responsible for carrying out at host computer the demonstration of paper image;
Wherein between image capture module and image processing module, adopt Camera Link interface to communicate.
Basic structure of the present invention as shown in Figure 1, the CCD line-scan digital camera that is contained in paper machine top carries out quick shooting, collecting to paper, view data is sent to fast FPGA by Camera Link interface and carries out after pre-service a road and be sent to VGA and show, another road is sent to DSP and is done further processing and paper defects is detected, and result is presented on PC by netting twine.
The course of work of the present invention is as follows: in paper machine production paper process, the CCD line-scan digital camera that is contained in paper machine top carries out quick shooting, collecting to paper, view data is sent to FPGA fast by Camera Link interface carries out after pre-service a road and is sent to VGA and shows, another road is sent to DSP and is done further processing and paper defects is detected.
Wherein: image acquisition modality: the CCD line-scan digital camera adopts the highly sensitive black and white line array camera of DALSA Spyder 3 CL S3-20-02K40-00-R, and Spyder 3 CL Series Industrial cameras, for Spyder 2, have higher than the responsiveness of 3 times and the speed of 2 times.It has adopted the double line scanning technology, reaches the transmission speed of high-responsivity and per second 80M pixel.Except its high-performance and high performance-price ratio, Spyder 3 CL also have some advanced features such as flat field correction and CDS (correlated-double-sampling) etc., due to the optical design of Spyder series based on identical, so upgrading is convenient.Due to the characteristic of Spyder 3 CL, it is widely used in various industrial detection occasions.
Image processing module: this module mainly is comprised of FPGA and dsp chip, the FPGA process chip is selected the EP3C40F484C8 of Altera, and the data input and output of Camera Link are supported in the design of compatible EP3C16F484C8, mainly for the treatment of the high-definition image input signal, carry out intellectual analysis.The DSP process chip selects the TMS320C6455 of TI as master chip, can be used for high-speed data, video signal detection, the application such as analysis.
Image display: the image of host computer is accepted display client.After FPGA receives Camera Link video flowing, minute two kinds of modes are processed, one, and transmission process, send to DSP by pixel, for DSP, analyzes and process.Its two, Graphics Processing, after the SDRAM buffer memory, use the VGA output display.After the DSP analyzing and processing, data can show at host computer by netting twine, and in addition, this module can also arrange video parameter and video data is saved as to file.
Camera Link interface adopts the SDR connector of 3M company, and signal definition is with reference to the definition standard, as shown in Figure 2, pin as shown in Figure 3:
The hardware of Camera Link connects block diagram as shown in Figure 4.In view of current paper speed is not also very fast, this system is selected Base Camera Link pattern here, as shown in Figure 5.Hardware circuit comprises 3 parts: camera connects image pick-up card by MDR26; The LVDS signal of CameraLink interface and cmos signal change-over circuit; FPGA receives camera data and sends control section.
In order camera to be carried out to the control of external trigger mode and to send order to camera, be converted to the chip of LVDS differential signal with the four-way cmos signal.DS90LV047 is as image pick-up card, synchronous triggering signal and conversion command outside camera sends.Because the DS-21-02M30 camera is only used CC1, the image pick-up card that FPGA forms, realize by CC1 and SerTC signal the control of camera.The acknowledge character string sent to image processing system in order to receive camera, select the DS90LV048 chip as the image processing system receiver.The DS90LV048 chip is the driver that four-way LVDS differential signal is converted to cmos signal.The signal of Camera Link comprises video, camera control, three parts of serial communication.Video section is the core of Camera Link, mainly comprises 5 pairs of differential signals, i.e. X0-~ X0+, X1-~ X1+, X2-~ X2+, X3-~ X3+, Xclk-~ Xclk+; Camera control comprises 4 pairs of differential signals, i.e. CC1-~ CC1+, CC2-~ CC2+, CC3-~ CC3+, CC4-~ CC4+; Serial communication partly comprises 2 pairs of differential signals, i.e. SerTC-~ SerTC+ and SerTFG-~ SerTFG+.The video section transmitting terminal is data-signal and 1 clock signal of 28, in the ratio of 7:1, data-switching become to 5 pairs of differential signals, and receiving end converts 5 pairs of differential signals to data-signal and 1 clock signal of 28.5 pairs of differential output signals for video section, select Channel Link to turn the chip DS90CR288 of TTL/CMOS as receiving chip, receive 4 pairs of differential data signals and 1 pair of differential clock signal, export 28 bit data and 1 tunnel clock signal, and the maximum clock frequency that this chip can pass through can reach 85MHz.
Camera control partly comprises 4 pairs of differential signals, and camera production firm can carry out different definition to these four signals according to different cameras.Here select differential driving chip DS90LV07A, this chip just can drive 4 pairs of differential signals.
Serial communication partly comprises 2 pairs of differential signals, and serial communication is defined as asynchronous communication model, by serial communication, can the various parameters of camera be arranged.Select to have that the 1 pair of difference sends and the chip DS90LV019 of 1 pair of differential received just can convert differential pair signal to the LVTTL signal, convert the RS-232 level to through RS-232 level transferring chip MAX232 more afterwards, like this can be directly and microcomputer communication.
Because single Camera Link chip only has 28 bit data to use, some camera, in order to improve the efficiency of transmission data, needs several Camera Link chips.By the request for utilization difference, be divided into three kinds of configurations: basic configuration is a Camera Link chip, a cable; Middle-grade two Camera Link chips, the cable of being configured to; All be configured to two Camera Link chips, two cables.
Because the camera of selecting belongs to basic configuration, the therefore detailed description of 28 bit data under this configuration of article here.28 bit data signals comprise three data ports: A mouth (8), B mouth (8), C mouth (8), with four video control signal FVAL (frame is effective), DVAL (data are effective), LVAL (row effectively), SPARE (sky is not temporarily used).Through the clock signal after Camera Link chip conversion, be the synchronized signal of whole camera, all data and video control signal all with this clock signal synchronization.
Except the described technical characterictic of instructions, all the other technical characterictics are those skilled in the art's known technology.
Claims (2)
1. the high speed web inspection system based on Camera Link interface, is characterized in that, comprising:
Image capture module: be responsible for gathering picture number from the paper machine;
Image processing module: completed by FPGA+DSP, be responsible for the processing such as cutting apart by image paper defects is detected;
Display module; For the line parameter setting of going forward side by side of real time inspection paper image, be responsible for carrying out at host computer the demonstration of paper image;
Wherein between image capture module and image processing module, adopt Camera Link interface to communicate.
2. the high speed web inspection system based on Camera Link interface according to claim 1, is characterized in that, described image capture module is comprised of the CCD line-scan digital camera.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310489524.7A CN103499587A (en) | 2013-10-18 | 2013-10-18 | High-speed paper defect detecting system based on Camera Link interface |
| CN201420012937.6U CN204064959U (en) | 2013-10-18 | 2014-01-09 | Based on the high speed web inspection system of Camera Link interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310489524.7A CN103499587A (en) | 2013-10-18 | 2013-10-18 | High-speed paper defect detecting system based on Camera Link interface |
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| CN103499587A true CN103499587A (en) | 2014-01-08 |
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| CN201310489524.7A Withdrawn CN103499587A (en) | 2013-10-18 | 2013-10-18 | High-speed paper defect detecting system based on Camera Link interface |
| CN201420012937.6U Expired - Fee Related CN204064959U (en) | 2013-10-18 | 2014-01-09 | Based on the high speed web inspection system of Camera Link interface |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763549A (en) * | 2014-01-13 | 2014-04-30 | 昆明理工大学 | Camera Link interface testing and developing system based on FPGA |
| CN106018409A (en) * | 2016-06-29 | 2016-10-12 | 哈尔滨工程大学 | Airfield runway foreign matter and crack recognizing system and detecting and recognizing method thereof |
| CN113504241A (en) * | 2021-07-13 | 2021-10-15 | 陕西科技大学 | Design method of paper defect detection system |
-
2013
- 2013-10-18 CN CN201310489524.7A patent/CN103499587A/en not_active Withdrawn
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2014
- 2014-01-09 CN CN201420012937.6U patent/CN204064959U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763549A (en) * | 2014-01-13 | 2014-04-30 | 昆明理工大学 | Camera Link interface testing and developing system based on FPGA |
| CN103763549B (en) * | 2014-01-13 | 2016-02-24 | 昆明理工大学 | A kind of Camera Link interface experiment based on FPGA and development system |
| CN106018409A (en) * | 2016-06-29 | 2016-10-12 | 哈尔滨工程大学 | Airfield runway foreign matter and crack recognizing system and detecting and recognizing method thereof |
| CN106018409B (en) * | 2016-06-29 | 2019-04-16 | 哈尔滨工程大学 | A kind of identifying system and its detection recognition method of airfield runway foreign matter and crackle |
| CN113504241A (en) * | 2021-07-13 | 2021-10-15 | 陕西科技大学 | Design method of paper defect detection system |
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| CN204064959U (en) | 2014-12-31 |
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Application publication date: 20140115 |