CN200956018Y - Multi-vision aviation container safety inspection system - Google Patents
Multi-vision aviation container safety inspection system Download PDFInfo
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- CN200956018Y CN200956018Y CN 200620113713 CN200620113713U CN200956018Y CN 200956018 Y CN200956018 Y CN 200956018Y CN 200620113713 CN200620113713 CN 200620113713 CN 200620113713 U CN200620113713 U CN 200620113713U CN 200956018 Y CN200956018 Y CN 200956018Y
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- 230000003993 interaction Effects 0.000 claims abstract description 4
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- 238000002955 isolation Methods 0.000 claims description 3
- 230000003537 radioprotector Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 4
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- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 238000002591 computed tomography Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 238000002594 fluoroscopy Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
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- 239000002360 explosive Substances 0.000 description 1
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- 238000013507 mapping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
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Abstract
The utility model discloses a multi-perspective security inspection system for aerial containers, which relates to the field of radiation checking technology. The system comprises a turntable for loading the containers and a ray generating device which is used for producing radiation beam to transmit container. A scanning device is used for receiving radiation beam which transmits the container. The transmission data of the container is received by the scanning device, and then transmitted to a main control and data processing computer. The main control and data processing computer which can rebuild the transmission data received from the scanning device into image and display at the same time,is used for providing a human-computer interaction interface. The utility model is used for rapid security inspection for aerial containers with the high efficiency, and meets the need of rapid security inspection for mass cargoes of airport. The problem of image for superposition cargoes is resolved effectively, thereby improving the accuracy for cargo checking. The utility model is extremely propitious to the checking for contraband.
Description
Technical field
The utility model relates to the radiation checking technical field, relates in particular to a kind of multi-vision aviation container safety inspection system.
Background technology
Safety inspection has crucial meaning in fields such as anti-terrorism, strike traffic in drugs smugglings.After the calendar year 2001 U.S.'s 911 incidents, countries in the world are more and more paid attention to the safety inspection of civil aviation.Along with the deep expansion of hitting the traffic in drugs smuggling, also more and more higher simultaneously to the requirement of various cargo safety inspections.On the airport, public place such as station, customs and harbour, taked a series of safety inspection measures that hand baggage article, cargo container etc. are checked.
Computer tomography (Computed Tomography, CT) technology is widely used at medical diagnosis and industrial nondestructive testing field, and along with the development of society, it also increases gradually in the demand of public safety and social security.In the CT scan system of widespread use, in the majority with the scan mode of circular orbit.The physical construction that this scan mode requires is comparatively simple, realizes easily on engineering, simultaneously corresponding reconstruction algorithm mature and reliable.In the scanning system of circular orbit, general fladellum or the pencil-beam X-CT modes of adopting more, corresponding detector is respectively linear array or planar array detector, and x-ray source-detector is to placing with respect to object turntable rotation center symmetry.
When utilizing the CT scan system that large-volume objects is carried out the CT tomoscan, general feasible method is to adopt the scan mode of rotation+translation, checks that promptly object rotates around central shaft, and the radiographic source detector moves along the direction that is parallel to turning axle.For the bigger object of xsect, if wish accurate reconstruction, just need carry out the projection of big measuring angle, cause the speed of safety inspection very slow, efficient is also very low, and a lot of data might not be that the user is concerned about.Therefore, such CT scan system is unpractical for the airport that all needs lot cargo is carried out safety inspection every day.
In addition, for perspective imaging, if with the beam parallel direction a plurality of article are being arranged, then article are mutual superposition in image, are difficult to accurately differentiate article generally speaking, bring very big difficulty for the inspection of contraband goods.
The utility model content
(1) technical matters that will solve
The purpose of this utility model is to provide a kind of multi-vision aviation container safety inspection system at above-mentioned the deficiencies in the prior art.
(2) technical scheme
For achieving the above object, the technical solution adopted in the utility model is such:
A kind of multi-vision aviation container safety inspection system comprises the turntable that is used for bearing container, and this system also comprises:
The ray generating means is used to produce the beam of transmission container, is scanned device behind this beam transmission container and receives;
Scanister is used to receive the transmission data of transmission container beam, and the transmission data of obtaining is sent to master control and data handling machine;
Master control and data handling machine are used to provide human-computer interaction interface, and the transmission data that is received from scanister is redeveloped into image and demonstration.
Described ray generating means is an X ray accelerator radiographic source.
Described scanister comprises: data collector, and the beam that is used for being received from the ray generating means is converted into electric signal, and signals converted is sent to image acquiring device; Image acquiring device is used to receive the electric signal that data collector sends, and the electric signal that receives is sent to master control and data handling machine; Conveyer is used for container is sent to turntable, and after checking end container is transported out of turntable; Slewing equipment is used for fixing container and turntable synchronous operation on the turntable; The scanning jacking gear is used to carry ray generating means and detector synchronization lifting.
Described data collector comprises detector array and measurement mechanism.
Described conveyer comprises the aviation case conveyer at turntable two ends and is used for carrying out the lifting conveyer that transition transmits with the airport transportation equipment.
The container conveyer of described slewing equipment on rotary table or turntable, installing.
Described scanning jacking gear is two groups of hoistable platforms, is separately installed with ray generating means and data collector.Described hoistable platform further is equipped with horizontal collimating apparatus.
Described scanister further comprises radioprotector, is used for equipment and operating personnel are carried out safety isolation and protection.
This system further comprises scan controller, is used for according to the instruction that is received from master control and data handling machine to the scanister sending controling instruction, and the gated sweep device scans container.
(3) beneficial effect
1, because the system that application the utility model provides can carry out various visual angles scanning to air container, obtain the various visual angles data for projection of air container fast, and reconstruct the faultage image of air container according to the various visual angles data for projection that obtains, so the utility model can be realized the inspection fast and safely to air container, improve the safety inspection efficient of air container greatly, satisfied the airport is carried out safety inspection fast to lot cargo needs.
2, because the utility model can be rebuild the faultage image of air container, thus efficiently solve the problem of article mutual superposition when rebuilding fluoroscopy images, and then effectively improved the accuracy rate that article are checked, be very beneficial for inspection to contraband goods.
Description of drawings
The multi-vision aviation container check system schematic diagram that Fig. 1 provides for the utility model;
The multi-vision aviation container check system synoptic diagram that Fig. 2 provides for the utility model;
The multi-vision aviation container safety inspection method flow diagram that Fig. 3 provides for the utility model;
Fig. 4 scans synoptic diagram for the circular orbit fan-beam of the multi-vision aviation container check system that the utility model provides;
The various visual angles scan mode synoptic diagram of the multi-vision aviation container check system that Fig. 5 provides for the utility model.
Embodiment
Know more and understand for the technical scheme that the utility model is provided,, the utility model is elaborated below in conjunction with specific embodiment and with reference to accompanying drawing.
As shown in Figure 1, the multi-vision aviation container check system schematic diagram that provides for the utility model of Fig. 1.Ray generating means 101 produces X-ray beam, the air container 102 of carrying on the transmission turntable 104, the detector array that projection data after the transmission is scanned device 103 receives, and sending master control and data handling machine to, master control and data handling machine carry out image reconstruction and show the image of rebuilding the data for projection that receives.
The multi-vision aviation container safety inspection system that the utility model provides comprises turntable, ray generating means, scanister and master control and data handling machine.Wherein, turntable is used for bearing container.The ray generating means is used to produce the beam of transmission container, is scanned device behind this beam transmission container and receives.Scanister is used to receive the transmission data of transmission container beam, and the transmission data of obtaining is sent to master control and data handling machine.Master control and data handling machine are used to provide human-computer interaction interface, and the transmission data that is received from scanister is redeveloped into image and demonstration.
This system can further include scan controller, is used for according to the instruction that is received from master control and data handling machine to the scanister sending controling instruction, and the gated sweep device scans container, and drives the turntable rotation.
In the multi-vision aviation container safety inspection system that the utility model provides, in order to obtain reconstructed image more clearly, the ray generating means is generally selected X ray accelerator radiographic source for use.
In the multi-vision aviation container safety inspection system that the utility model provides, scanister comprises data collector, image acquiring device, conveyer, slewing equipment and scanning jacking gear.
Wherein, the beam that data collector is used for being received from the ray generating means is converted into electric signal, and signals converted is sent to image acquiring device, is generally detector array.And this survey device array is generally linear array and surveys the device array, is positioned at the radiogenic opposite of X ray accelerator, and promptly described survey device array and X ray accelerator radiographic source are placed about the central shaft symmetry of turntable.In order to realize checking fast and accurately, data collector also comprises the device that is used for accurately measuring or demarcating following systematic parameter: X ray accelerator radiographic source is to the distance D of detector, X ray accelerator radiographic source is to the distance R of turntable turning axle, X ray accelerator radiographic source is mapping position P (u on imaging screen, v), the Pixel Dimensions d of imaging screen, turntable anglec of rotation θ etc.The device of measuring or demarcating for these systematic parameters is known in the art, does not therefore repeat them here.
Image acquiring device is used to receive the electric signal that data collector sends, and the electric signal that receives is sent to master control and data handling machine.
Conveyer is used for container is sent to turntable, and after checking end container is transported out of turntable.Described conveyer comprises the aviation case conveyer at turntable two ends and is used for carrying out the lifting conveyer that transition transmits with the airport transportation equipment.In actual applications, should move control reliably, and conveyer should effectively be used in combination also with the existing transfer equipment that uses in airport to conveyer.Tested aviation case is by being divided into three sections roller bed type transfer system transmission, and the conveyer of interlude is to transmit and turn round turntable by roller bed type to constitute, and it can transmit the aviation case and move on passage, and the aviation case is rotated.
Slewing equipment is used for fixing container and the turntable synchronous operation on the turntable.Turntable requires to carry out the revolution operation of continous-stable under load-up condition, table top is wanted and can be transmitted conveying automatically and stop the location the aviation case.The displacement signal of turntable angle of revolution can be used to control X ray accelerator radiographic source and produces pulse.The aviation case conveyer of installing on the turntable can guarantee that the aviation case can run on the turntable or from turntable automatically and run on the conveyer automatically, and prevent aviation case shift position when turntable moves.
The scanning jacking gear is used to carry ray generating means and detector synchronization lifting.Described scanning jacking gear is two groups of hoistable platforms, is separately installed with ray generating means and data collector.In addition, on hoistable platform, horizontal collimating apparatus can also be installed further.
In the multi-vision aviation container safety inspection system that the utility model provides, scanister can further include radioprotector, is used for equipment and operating personnel are carried out safety isolation and protection
As shown in Figure 2, the multi-vision aviation container check system synoptic diagram that provides for the utility model of Fig. 2.During system works, air container is delivered on the rotary table 204 by transmitting roller-way 201, X ray accelerator radiographic source 202 and detector array 203 separate from the both sides of rotary table 204, rotary table 204 can rotate continuously or be positioned to specify the anglec of rotation, and X ray accelerator radiographic source 202 and detector array 203 can move up and down synchronously.When rotary table 204 was static, a synchronization lifting by X ray accelerator radiographic source 202 and detector array 203 can obtain the 2 d fluoroscopy images of aviation case under current visual angle.Be maintained fixed height at X ray accelerator radiographic source 202 and detector array 203, rotary table 204 drives the aviation case and rotates continuously, can obtain the aviation case at the CT of current slice position data for projection.
As shown in Figure 3, the multi-vision aviation container safety inspection method flow diagram that Fig. 3 provides for the utility model, this method may further comprise the steps:
Step 301: the various visual angles data for projection of turntable bearing container is obtained in scanister scanning, and the various visual angles data for projection that will obtain sends to master control and data handling machine.
In this step, to obtain the process of various visual angles data for projection of turntable bearing container as follows for the scanning of described scanister:
1, start-up system, ray generating means produce the container of beam transmission turntable carrying, and vertically move upward, and scanister receives the data for projection of transmission turntable bearing container; When scanister receives the data for projection of transmission turntable bearing container, along ray generating means travel direction and the synchronous operation of ray generating means;
2, the ray generating means moves to the summit, and the turntable bearing container turns an angle, and ray generating means transmission turntable bearing article also vertically moves downward, and scanister receives the data for projection of transmission turntable bearing container; In this step, the turntable bearing container rotates the angle of at least 15 degree;
3, repeated execution of steps step 2 is rotated a week until the turntable bearing container, and data collector receives whole data for projection of transmission turntable bearing container.
In scanning process, circular orbit fan-beam scanning synoptic diagram can be referring to Fig. 4, and Fig. 4 shows the circular orbit fan-beam scanning synoptic diagram of the multi-vision aviation container check system that the utility model provides.Various visual angles scan mode synoptic diagram can be referring to Fig. 5, and Fig. 5 shows the various visual angles scan mode synoptic diagram of the multi-vision aviation container check system that the utility model provides.The projection scanning that has shown uniform four angles in Fig. 5, S1, S2, S3 and S4 are respectively residing four positions of X ray accelerator radiographic source.
Step 302: the various visual angles data for projection that master control and data handling machine will receive is redeveloped into image and shows.
In this step, when master control and data handling machine carry out image reconstruction to the various visual angles data for projection that receives, can adopt filter back-projection algorithm (Filtered-backprojctionalgorithm, FBP), greatest hope value-based algorithm (Expectation Maximum, EM) and the order subset statistic algorithm (Ordered Subset EM OSEM) carries out.
When the various visual angles data for projection that adopts the FBP algorithm to receive was redeveloped into image, process of reconstruction comprised:
1), the various visual angles data for projection that receives is carried out filtering, detailed process is as follows:
Suppose F
p(ρ is the various visual angles data for projection receiving one dimensional fourier transform on the plane parallel direction with data acquisition unit θ), according to formula
The various visual angles data for projection that receives is carried out Filtering Processing, obtain Filtering Processing result the various visual angles data for projection;
2), the various visual angles data for projection after the Filtering Processing is carried out back projection, detailed process is as follows: suppose
For the image of rebuilding, according to formula
The Filtering Processing result is carried out back projection handle, obtain the reconstructed image of various visual angles data for projection.
When the various visual angles data for projection that adopts the EM algorithm to receive was redeveloped into image, process of reconstruction comprised following two steps: promptly E goes on foot, the expectation value of design conditions likelihood function; The M step, the maximal value of calculation expectation function.
Lifting an object lesson below is elaborated to the EM algorithm flow:
(1) supposes the image of x for rebuilding, a
IjBe projection matrix coefficient, initialization
For on the occasion of;
(2) carry out following step, up to convergence:
B) calculate projection value
C) to projection value back projection,
D) obtain
The OSEM algorithm is similar to the EM algorithm, but speed of convergence must EM algorithm height, and image quality EM algorithm is close, and the utility model also can adopt the OSEM algorithm.When the various visual angles data for projection that adopts the OSEM calculation to receive was redeveloped into image, process of reconstruction comprised:
(1) supposes the image of x for rebuilding, a
IjBe projection matrix coefficient, initialization
For on the occasion of;
(2) carry out following step, up to convergence:
B) for each subclass i=1,2 ..., n calculates projection value
Projection value is carried out back projection
C) obtain
The various visual angles data for projection that receives is carried out after image reconstruction finishes at master control and data handling machine, master control and data handling machine show the image of rebuilding.
In addition, when air container was scanned, the utility model can also adopt double-view angle scanning pattern and CT section scan pattern.
Under the double-view angle scanning pattern, system only obtains two 2 d fluoroscopy images under the orthogonal views, shows simultaneously that on computer screen two width of cloth fluoroscopy images are for operator's interpretation.This mode scanning time is short, the percent of pass height, but operator's interpretation mode and foundation are similar with original check system, need higher experience and sense of responsibility.
Under CT section scan pattern, system at first obtains the CT data for projection that the aviation case is specified slice position, then rebuilds the corresponding CT faultage image that generates this position by data, and warning is provided.Because this sectioning image can reflect the size and the distribution mode of cargo density information in the corresponding section of aviation case, the accuracy rate of warning greatly improves, but sweep time is longer.
And under the various visual angles scan pattern, system obtains the 2 d fluoroscopy images under several different visual angles continuously, go out the three-dimensional data of whole object by incomplete data method for reconstructing approximate reconstruction, be shown on the computer screen for operator's interpretation, and can carry out interactive operation to the dependent projections data by man-machine interface, highlight emphasis suspicion zone simultaneously.System can tentatively realize the warning to dangerous material such as explosives under this pattern, and sweep time is moderate, so as the preferred scan mode of the utility model.
System can carry out automatically to the switching of three kinds of scan patterns, and does not need switching time, therefore in actual use, can use different scan patterns flexibly according to risk assessment or the airport security class requirement to aviation case to be checked.Under the situation of pursuing percent of pass, select the double-view angle scanning pattern for use; Under usual condition, use earlier the various visual angles scan pattern, and the backsight concrete condition is carried out CT section scanning to the ad-hoc location of the suspicion aviation case that can not get rid of in the three-dimensional data interpretation.
Below only be embodiment of the present utility model; be not limited to the utility model; according to the disclosed content of the utility model, some identical, replacement schemes that those of ordinary skill in the art can expect apparently all should be included within the protection domain of the present utility model.
Claims (10)
1, a kind of multi-vision aviation container safety inspection system comprises the turntable that is used for bearing container, it is characterized in that, this system also comprises:
The ray generating means is used to produce the beam of transmission container, is scanned device behind this beam transmission container and receives;
Scanister is used to receive the transmission data of transmission container beam, and the transmission data of obtaining is sent to master control and data handling machine;
Master control and data handling machine are used to provide human-computer interaction interface, and the transmission data that is received from scanister is redeveloped into image and demonstration.
2, system according to claim 1 is characterized in that, described ray generating means is an X ray accelerator radiographic source.
3, system according to claim 1 is characterized in that, described scanister comprises:
Data collector, the beam that is used for being received from the ray generating means is converted into electric signal, and signals converted is sent to image acquiring device;
Image acquiring device is used to receive the electric signal that data collector sends, and the electric signal that receives is sent to master control and data handling machine;
Conveyer is used for container is sent to turntable, and after checking end container is transported out of turntable;
Slewing equipment is used for fixing container and turntable synchronous operation on the turntable;
The scanning jacking gear is used to carry ray generating means and detector synchronization lifting.
4, system according to claim 3 is characterized in that, described data collector comprises detector array and measurement mechanism.
5, system according to claim 3 is characterized in that, described conveyer comprises the aviation case conveyer at turntable two ends and is used for carrying out the lifting conveyer that transition transmits with the airport transportation equipment.
6, system according to claim 3 is characterized in that, the container conveyer of described slewing equipment for installing on rotary table or turntable.
7, system according to claim 3 is characterized in that, described scanning jacking gear is two groups of hoistable platforms, is separately installed with ray generating means and data collector.
8, system according to claim 7 is characterized in that, described hoistable platform further is equipped with horizontal collimating apparatus.
9, system according to claim 3 is characterized in that, described scanister further comprises radioprotector, is used for equipment and operating personnel are carried out safety isolation and protection.
10, system according to claim 1, it is characterized in that, this system further comprises scan controller, is used for according to the instruction that is received from master control and data handling machine to the scanister sending controling instruction, and the gated sweep device scans container.
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| CN 200620113713 CN200956018Y (en) | 2006-05-08 | 2006-05-08 | Multi-vision aviation container safety inspection system |
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| CN 200620113713 CN200956018Y (en) | 2006-05-08 | 2006-05-08 | Multi-vision aviation container safety inspection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071111B (en) * | 2006-05-08 | 2011-05-11 | 清华大学 | Multi-vision aviation container safety inspection system and method |
| CN104567758A (en) * | 2013-10-29 | 2015-04-29 | 同方威视技术股份有限公司 | Three-dimensional imaging system and method thereof |
| CN115598718A (en) * | 2021-07-07 | 2023-01-13 | 同方威视技术股份有限公司（Cn） | Inspection system and method |
-
2006
- 2006-05-08 CN CN 200620113713 patent/CN200956018Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071111B (en) * | 2006-05-08 | 2011-05-11 | 清华大学 | Multi-vision aviation container safety inspection system and method |
| CN104567758A (en) * | 2013-10-29 | 2015-04-29 | 同方威视技术股份有限公司 | Three-dimensional imaging system and method thereof |
| CN104567758B (en) * | 2013-10-29 | 2017-11-17 | 同方威视技术股份有限公司 | Stereo imaging system and its method |
| CN115598718A (en) * | 2021-07-07 | 2023-01-13 | 同方威视技术股份有限公司（Cn） | Inspection system and method |
| CN115598718B (en) * | 2021-07-07 | 2024-05-31 | 同方威视技术股份有限公司 | Inspection system and method |
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| C14 | Grant of patent or utility model | ||
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| CP03 | Change of name, title or address |
Address after: 100084 Tsinghua University, Beijing, Haidian District Co-patentee after: Nuctech Company Limited Patentee after: Tsinghua University Address before: 100084 Tsinghua University, Beijing, Haidian District Co-patentee before: Qinghua Tongfang Weishi Tech Co.,Ltd. Patentee before: Tsinghua University |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20071003 Effective date of abandoning: 20111207 |