CN102243188A - Platform and method for industrial computerized tomography (ICT) imaging, wireless streaming media data processing, and three dimensional reconstruction - Google Patents
Platform and method for industrial computerized tomography (ICT) imaging, wireless streaming media data processing, and three dimensional reconstruction Download PDFInfo
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Abstract
The invention discloses a platform and a method for industrial computerized tomography (ICT) imaging, wireless streaming media data processing, and three dimensional reconstruction. The platform comprises a mechanical scanning system, an X-ray source, a CCD device, a video server, a first wireless interface, a second wireless interface, and an image processing platform. The method comprises the following steps: an area required for detection of an object to be detected is selected, and an initial position is positioned; an energy wire harness of the X-ray source penetrates through the initial position of the selected object to be detected; optical signals are converted into digital image signals through directly irradiating the optical signals on a CCD camera; the digital image signals are transmitted to an embedded server through a standard port; streams of the input digital image signals are encoded through a video encoding chip; encoded image code streams are output to an image frame memory; a new scanning position of the object to be detected is selected through repositioning by the mechanical scanning system; new data of a frame slice are acquired; and the code streams in the image frame memory are finally stored in a hard disk of a server in a video encoding format of MPEG.
Description
Technical field
The present invention relates to that industry CT (computed tomography) is theoretical, wireless transmission is theoretical, Flame Image Process is theoretical, realization is used for imaging and the wireless flow media data processing and the three-dimensional reconstruction platform of industry CT (computed tomography), has the characteristics of miniaturization image processing system.
Background technology
Industry CT (industrial computerized tomography, ICT) be to utilize ray under the measured workpiece nondestructive state, with scan mode transmission object to be detected tomography, and with detector getting off through the information acquisition behind the checking matter ray attenuation, computing machine adopts special image reconstruction algorithm, section to be detected is shown with the two dimensional gray image format, and it detects the cross-section image that result directly perceived is exactly tested tomography.By this CT image just can clearly see clearly layer of structure in the tested object tomography, part the material situation, the correctness of zero defect, assembling is arranged, help quality inspection personnel to make correct conclusion.Therefore industry CT is described as best nondestructiving detecting means by international Non-Destructive Testing circle.
As shown in Figure 1, present industrial CT system is made up of radiographic source, machine control unit, detector system, data acquisition system (DAS), data transmission system, computer system etc. usually.
Radiographic source provides the energy wire harness of CT scan imaging in order to the penetration-detection object, characterizes the CT image according to the attenuation of ray in inspected object with the attenuation coefficient of each point.The rotation or the translation of inspected object when machine control unit is realized scanning, and the adjustment of the locus between the radiographic source, inspected object, detector three, it comprises mechanical realization equipment and electrical apparatus control equipment.
Detector system is used for measuring the ray signal that passes inspected object, the transmitted intensity that detects is converted to faint photocurrent delivers in the data acquisition system (DAS) and handle.The general use of Industrial CT Machine is hundreds of to thousands of detectors, is arranged in wire.Detector quantity is many more, and counting of each sampling is also just many more, helps shortening sweep time, improves image resolution ratio.
Data acquisition system (DAS) is carried out current/voltage-converted with the photocurrent that detector obtains, to amplify from the detectable signal of multichannel through amplifying circuit again, by modulus A/D conversion analog quantity is converted to digital signal then, by data transmission system signal is sent into computing machine again and handle.
Computer system is the terminal system of industrial CT system, is the critical system of total system.Generally comprise image processing system (image processing platform) and data management system.Data management system is used for managed storage CT image data.Image processing system is used for handling the image of inspected object after CT scan, and by image segmentation, the 3-dimensional reconstruction scheduling algorithm is finished image reconstruction, and the result that will detect shows, and helps quality inspection personnel to analyze.
From foregoing description, as can be seen, in the whole technique system of industry CT, technology such as data acquisition, data transmission, Flame Image Process have been comprised.Except that hardware system, image processing software platform and algorithm also are one of core technologies.
From the development of industry CT technology, external industry CT disposal system since starting early, thereby development is very fast, and has released some application systems.As, the Volume Graphics company of Heidelberg, Germany has released the software systems of VGStudio MAX1.2 in 2005, this system has more powerful three dimensional display capabilities, the two-dimensional ct image of the multiple different-format that obtains for industry CT, can carry out three-dimensionally shapedly, and can carry out labor and demonstration defective.The CITA201 of American I DM company can detect the steel plate that maximum ga(u)ge is 254mm, and maximum gauge is the workpiece of 1.5m, and spatial resolution is up to 0.25-1mm.With abroad compare, the industry CT research of China is started late, especially aspect high energy ICT, the U.S. prohibites the above CT equipment outlet China of 2Mev.Therefore, domestic industry CT technical research and equipment development relatively lag behind in abroad, and mostly be to study at using in the military affairs, " southwestern ICT research and development centre " as units such as University Of Chongqing, Chinese gongwu research institute form is mainly used in fields such as national defence, space flight, machinery.
At present, domestic research and the application platform of handling at INDUSTRIAL CT IMAGE and few, in the field of study, for analysis and the processing of studying INDUSTRIAL CT IMAGE, mostly adopt the MATLAB emulation tool to analyze, the sequence faultage image that Industrial CT Machine is provided as the red grade of the Zhao Jun of University Of Chongqing utilizes MATLAB to carry out three-dimensional reconstruction.Aspect market product, existing commercialization CT processing platform mostly is to be that medical science detects and the research service, as CT workstation image processing platform of efilm workstation, " i " PlatForm platform, the research and development of the easy software of Dongguan skill Science and Technology Ltd. or the like.These system platforms have designed comparatively huge and sophisticated functions, even can provide service for medical science detection meanss such as color ultrasounds in order to reach maximum versatility, obviously are inappropriate with such INDUSTRIAL CT IMAGE that is designed in handling.In addition, by the industry CT faultage image of Institute of Automation Research of CAS exploitation handle with analytic system be present domestic research and development industry CT processing platforms preferably, but this system design complexity, structure is huge, portability is poor and the unusual costliness of price.
From the convenience angle, existing industry CT makes troubles also for the scene laying of equipment at the wire transmission mode that data transmission adopted.
Summary of the invention
The present invention seeks to lay situations such as dumb, that Platform Structure Design is complicated, transplantability is poor, cost an arm and a leg, propose a kind of industry CT imaging and wireless flow media data processing and three-dimensional reconstruction platform and method at the equipment that exists in the present industrial CT system.
The present invention adopts following technical scheme for achieving the above object:
Industry CT imaging of the present invention and wireless flow media data processing and three-dimensional reconstruction platform, comprise machine control unit, x-ray source, CCD device, video server, first and second wave points and image processing platform, wherein machine control unit connects x-ray source and CCD device respectively, the output terminal of CCD device is connected in series behind video server, first wave point and the second wave point wireless connections successively, and image processing platform is connected with second wave point.
The slice of data storage means of industry CT imaging and wireless flow media data processing and three-dimensional reconstruction platform is as follows:
(1) selected examined object needs surveyed area, by the machine control unit initial alignment;
(2) the energy wire harness of x-ray source penetrates the initial position of the examined object that is selected, and obtains the light signal of sign with the attenuation coefficient of each point according to the decay of ray in examined object;
(3) after light signal shines directly into the CCD camera, convert data image signal to, this data image signal is exactly the section picture that obtains from Industrial CT Machine scanning;
(4) data image signal passes to embedded server through standard port;
(5) by video coding chip the data image signal of input is encoded;
(6) image code stream after will encoding outputs to the picture frame storer;
(7) by the reorientating of machine control unit, choose the new scanning position of examined object;
(8) repeat above-mentioned (2)-(6) step, get access to a new frame slice of data, be compressed into code stream together with the data of obtaining previously, be stored in the picture frame storer according to time sequencing;
(9) circulation successively, after whole scanning process finished, the code stream in the picture frame storer finally was stored in the server hard disc with the video code model of MPEG.
The present invention is primarily aimed at two parts and designs: image slices series processing and the design of wireless flow media transmission technology based on embedded video server in (1) Industrial CT Machine; (2) image processing platform based on VideoLAN kernel, OpenCV kernel and the optimal combination of OpenGL kernel designs.
In system of the present invention, the scan-data of CT machine end is stored in the embedded server hard disk with compressed video format, and by wireless communication interface with data transmission to image processing platform, transmission course adopts 802.11 protocol processors and the adaptive broadband technology of 5.9GHz to transmit in the wireless flow media mode.
The terminal part of CT machine data is the PC (wave point, support the system of this image processing platform) of runs image processing platform, it is the kernel exploitation with VideoLAN that image processing platform receives data function, can support based on UDP and two main flow transport layer protocols of TCP, realize the reception and the transmission of real time flow medium, adopt this stream transmission mode can solve in the past shortcomings such as packet loss in the Radio Transmission Technology, time delay are big based on uniqueness.
The image processing program part, composite design at present two dimensional image handle and three-dimensional reconstruction aspect superior and two storehouses---OpenCV and OpenGL that increase income, two dimensional image Processing Algorithm program part adopts the OpenCV exploitation, and the OpenGL storehouse is used for the three-dimensional image reconstruction algorithm development.In order to keep independence and the optimal design between the various algorithm function, main by design relevant interface function, and be packaged into living document, in program run, call.
The slice of data of the uniqueness that this industrial CT system adopts is handled and the wireless streams mode is transmitted many deficiencies and the shortcoming that solves present industrial CT system data acquisition and hop, by compression storing data to CT machine end solved because the load of the huge hard disk that causes of data and with the problems such as loss of data that cause with this, the wireless streams transmission has solved CT and has held problems such as the big and packet loss of laying complexity, the time delay of terminal; The image processing platform of design can satisfy the primary demand of industry CT on function, comprise image pre-service, geometric transformation, rim detection, image segmentation and three-dimensional reconstruction etc., and make this platform have advantages such as stability is strong, clear in structure, fast processing by the various image processing functions that independently call various kernel function (VideoLAN, OpenCV and OpenGL) realization.
Description of drawings
Fig. 1: present industrial CT system structural drawing;
Fig. 2: system construction drawing of the present invention;
Fig. 3: the functional-block diagram of embedded video server;
Fig. 4: image processing platform algorithm cut-away view;
Fig. 5: image processing platform flow chart of data processing figure;
Fig. 6: receive section stream function code process flow diagram in real time;
Fig. 7: the loading code process flow diagram of section file;
Fig. 8: geometric transformation algorithm;
Fig. 9: edge detection algorithm;
Figure 10: image segmentation algorithm;
Figure 11: three-dimensional reconstruction algorithm.
Embodiment
Fig. 2 and Fig. 3 have described section generation, data storage and the transmission etc. of whole industrial CT system, wherein whole slice of data storing process, and detailed process is described below:
(1) selected examined object needs surveyed area, by the machine control unit initial alignment;
(2) the energy wire harness of x-ray source penetrates the initial position of the examined object that is selected, and obtains the light signal of sign with the attenuation coefficient of each point according to the attenuation of ray in examined object;
(3) after light signal shines directly into the CCD camera, convert data image signal to, this data image signal is exactly the section picture that obtains from Industrial CT Machine scanning;
(4) data image signal passes to embedded server through standard port;
(5) by video coding chip SAA7114 the data image signal of input is encoded;
(6) image code stream after will encoding outputs to the picture frame storer;
(7) by the reorientating of machine control unit, choose the new scanning position of examined object;
(8) repeat above-mentioned (2)-(6) step, get access to a new frame slice of data, be compressed into code stream together with the data of obtaining previously, be stored in the picture frame storer according to time sequencing;
(9) circulation successively, after whole scanning process finished, the code stream in the picture frame storer finally was stored in the server hard disc with the video code model of MPEG.
Wireless flow media hop among Fig. 2 adopts the wireless flow media transmission manner to be transferred to terminal (PC end) for the slice of data that obtains.Be described in detail as follows:
(1) terminal (based on OpenCV, OpenGL, the image processing platform system of VideoLAN kernel exploitation) is sent the flow transmission request, the port numbers and the IP of server access promptly is set, the request transmission;
(2) embedded server receives the terminal request signal, and the response terminal demand.Wherein, Transmission Control Protocol is adopted in the control information of embedded server and terminal, and embedded server and terminal are by SSH2 agreement realization visit each other;
(3) embedded server is decomposed into a succession of packet with the video code flow file in the buffer memory, utilizes will the cut into slices packet of sequence of the adaptive broadband wireless communications port of 802.11 protocol processors and 5.9GHz to send;
(4) terminal is according to built-in fixing IP of server and port numbers, as: http: // 192.168.0.1:8080.After corresponding IP and port numbers are set, directly from the real-time receiving stream-oriented data of embedded server;
(5) in the Industrial CT Machine scanning process, terminal can directly be visited embedded server, downloads the slice of data file (video file) of examined object from the embedded server internal hard drive.
The embedded video server principle is seen Fig. 3.
(1) mainly comprises the formation such as jtag test protocol interface, direct access storage device, Flash storer, synchronous DRAM SDRAM, ARM embedded system, RS485 communication interface, RS232 communication interface, 802.11 protocol processors and communication interface, general-purpose serial bus USB interface, power management module of video encoder SAA7114, frame memory, video digital signal processor DSP, programmable logic device (PLD) FPGA, standard.
(2) professional image/video digital signal processor (DSP) DM643 of TI company production, the high-end ARM embedded system PXA27X of Intel Company's production and the design platform that programmable logic device (PLD) FPGA (field programmable gate array) combines are adopted in the embedded video server design.
(3) communication interface adopts the IEEE802.p/n standard design, adopts the adaptive broadband wireless communications interface of 5.9GHz.FPGA is intended to set up the express passway of high-speed image sampling unit and central processing unit, the main initialization to video encoder, the required sequential of dsp system and ARM system and logical relation, basic I/O signal, the control R/W signal etc. of producing able to programme realized.
(4) high-end ARM embedded system is the coordinated management person of whole video server, and the ARM embedded system mainly is responsible for the exchange of communication, protocol analysis and data etc.
At last, adopt wireless receiving module will receive the image processing platform of data transmission to PC.
Image processing platform is based on Visual C++6.0, and in conjunction with VideoLAN, OpenCV storehouse, the exploitation of OpenGL storehouse, designed functional modules such as the reception of section stream, image pre-service, geometric transformation, rim detection, image segmentation and three-dimensional reconstruction.
Image processing platform algorithm cut-away view as shown in Figure 4.Make up 4 main interface functions, realize that respectively slice of data receives, data file (video file) loads, two dimensional image is handled, three-dimensional reconstruction.By Main function inner parameter directly and these 4 interface functions mutual, the transmission of implementation algorithm internal data; The Main function is mutual with Inteface again, linking between implementation algorithm function and the button.Wherein Fig. 6～Figure 11 is seen in the realization of each algorithm function.Adopted based on VideoLAN, OpenCV and OpenGL core design, because the characteristics that these kernels all have independence, increase income, interface function is simple, stability is strong, and, be convenient to follow-up algorithm like this and upgrade adopting the independence design between each functional module.Mode complementary in the independent sets ideally combines each functional structure, and the realization of each functional module is separate, be independent of each other, and the function of whole platform realizes smooth and unify, though used three kernels to write software, not redundant.The advantage of every kind of kernel is embodied a concentrated reflection of on the corresponding functional module, the kernel that different funcalls is different, thus make the realization of function reach optimization.
Flow chart of data processing in this image processing platform as shown in Figure 5, wherein the VideoLAN module is by to behind the ICP/IP protocol decoded packet data that receives, by video decode section is shown in the window again, these power functions are integrated in VideoLAN inside, directly call VideoLAN main thread interface by setting play parameter, realize real-time reception section stream.The OpenCV module reads slice of data from database, adopt the 2-d reconstruction algorithm to realize various image processing functions; The OpenGL module adopts the three-dimensional reconstruction algorithm to realize three-dimensional reconstruction function.The Main function is as the main thread function, and the thread of various functions all can directly call by the Main function, thereby realizes by above-mentioned various functions.
The stream of reception section in real time function, adopting the VideoLAN dynamic link library is the function that kernel is write stream reception, storage flow.The parameter of display setting is in real time: " I ", "--ignore-config " }.The parameter that storage is set is: { "--sout=#duplicate{dst=display, dst=std{access=file, mux=ts, dst="+Path+ " } } " }, wherein path is the path that the receiver, video stream file is deposited in this locality.Receiving section stream in real time deposits in the local folders with audio video interleaved.The specific code flow process is seen Fig. 6.
The OpenCV storehouse has been used in the loading of section file, and the program code flow process is seen Fig. 7.
Two dimensional image processing section function adopts the real-time image processing algorithm of OpenCV storehouse exploitation.Adopt basic interface function cvLoadImage to be written into section, use image processing algorithm, be shown in the window at last.
The OpenCV storehouse has been adopted in geometric transformation in the two dimensional image processing section, to the image slices that is written into, adopts methods such as arest neighbors interpolation, bilinear interpolation, realizes rotation, the Pan and Zoom of image.The program code flow process is seen Fig. 8.
Edge detection algorithm adopts edge detection methods such as Canny operator edge detection method and Sobel operator, and the program code flow process is seen Fig. 9.
Image segmentation algorithm adopts methods such as thresholding method, and the program code flow process is seen Figure 10.
3-D view processing section function adopts OpenGL storehouse exploitation three-dimensional reconstruction algorithm.Be written into various section sequences, the three-dimensional reconstruction algorithm, figure is shown in the window with three-dimensional reconstruction.Concrete structure flow process such as Fig. 5.
The three-dimensional reconstruction algorithm, program code flow process figure sees Figure 11.
Claims (2)
1. an industry CT imaging and wireless flow media data processing and three-dimensional reconstruction platform, it is characterized in that comprising machine control unit, x-ray source, CCD device, video server, first and second wave points and image processing platform, wherein the output terminal of machine control unit connects the input end of x-ray source and CCD device respectively, the output terminal of CCD device is connected in series behind video server, first wave point and the second wave point wireless connections successively, and image processing platform is connected with second wave point.
2. slice of data storage means based on the described industry CT imaging of claim 1 and wireless flow media data processing and three-dimensional reconstruction platform is characterized in that described method is as follows:
(1) selected examined object needs surveyed area, by the machine control unit initial alignment;
(2) the energy wire harness of x-ray source penetrates the initial position of the examined object that is selected, and obtains the light signal of sign with the attenuation coefficient of each point according to the decay of ray in examined object;
(3) after light signal shines directly into the CCD camera, convert data image signal to, this data image signal is exactly the section picture that obtains from Industrial CT Machine scanning;
(4) data image signal passes to embedded server through standard port;
(5) by video coding chip the data image signal of input is encoded;
(6) image code stream after will encoding outputs to the picture frame storer;
(7) by the reorientating of machine control unit, choose the new scanning position of examined object;
(8) repeat above-mentioned (2)-(6) step, get access to a new frame slice of data, be compressed into code stream together with the data of obtaining previously, be stored in the picture frame storer according to time sequencing;
(9) circulation successively, after whole scanning process finished, the code stream in the picture frame storer finally was stored in the server hard disc with the video code model of MPEG.
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| CN111060528A (en) * | 2019-12-31 | 2020-04-24 | 塔里木大学 | Optical detection system and detection method for fruit defect development rule |
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