WO2008046261A1 - Procédé permettant d'analyser un type d'objet en mouvement et son système et procédé d'imagerie et de détection de l'objet en mouvement et du système - Google Patents

Procédé permettant d'analyser un type d'objet en mouvement et son système et procédé d'imagerie et de détection de l'objet en mouvement et du système Download PDF

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Publication number
WO2008046261A1
WO2008046261A1 PCT/CN2006/003574 CN2006003574W WO2008046261A1 WO 2008046261 A1 WO2008046261 A1 WO 2008046261A1 CN 2006003574 W CN2006003574 W CN 2006003574W WO 2008046261 A1 WO2008046261 A1 WO 2008046261A1
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WO
WIPO (PCT)
Prior art keywords
moving target
moving
light beam
channel
identifying
Prior art date
Application number
PCT/CN2006/003574
Other languages
English (en)
French (fr)
Inventor
Zhiqiang Chen
Yuanjing Li
Yinong Liu
Junli Li
Hua Peng
Yaohong Liu
Shangmin Sun
Jinyu Zhang
Qingjun Zhang
Li Zhang
Yali Xie
Yanli Deng
Ming Ruan
Siyuan Liang
Guang Yang
Wei Jia
Original Assignee
Nuctech Company Limited
Tsinghua University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nuctech Company Limited, Tsinghua University filed Critical Nuctech Company Limited
Priority to AU2006346223A priority Critical patent/AU2006346223B2/en
Priority to US11/997,465 priority patent/US7911592B2/en
Priority to PL06828445T priority patent/PL2575118T3/pl
Priority to EP06828445.4A priority patent/EP2575118B1/en
Priority to BRPI0622243A priority patent/BRPI0622243B8/pt
Priority to JP2008539215A priority patent/JP4701290B2/ja
Publication of WO2008046261A1 publication Critical patent/WO2008046261A1/zh

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
    • G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
    • G01V5/232—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays having relative motion between the source, detector and object other than by conveyor
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/015—Detecting movement of traffic to be counted or controlled with provision for distinguishing between two or more types of vehicles, e.g. between motor-cars and cycles
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors

Definitions

  • Embodiments of the present invention relate to methods and systems for identifying moving targets, and more particularly to methods and systems for imaging imaging of moving targets in different radiation beam inspection modes for different moving targets. Background technique
  • the automatic avoidance of the cab is usually performed after the front end of the vehicle travels to a fixed position in the direction of the exit of the passage, and the system performs a scan check. Since the shape of different vehicles varies greatly, this type of avoidance must ensure that the largest vehicle in the cab can be safely avoided. In the case of small vehicles, image information is incomplete, and even some cars cannot be inspected at all. For the truck to check the image, there is no unnecessary information. This type of inspection limits the energy and dose rate of the source, causing some vehicles to fail to check, check for low image indicators, have excess information, or have incomplete information, and cannot guarantee that the dose of radiation received by the driver is minimal. There is therefore a need for a vehicle shape recognition system that can be automatically sorted by usage to provide a suitable scanning solution for a rapid inspection system.
  • the traditional vehicle identification system for toll collection only measures the height of the vehicle and the length of the vehicle, and then determines the charging standard by the size of the vehicle.
  • Traditional vehicle identification systems cannot be classified according to the purpose of the vehicle, and it is not possible to identify whether it is a passenger car or a truck. Summary of the invention
  • a method for recognizing a moving target comprising the steps of: a driving step of causing a moving target to enter a channel; a speed measuring step for measuring a moving speed of the moving target; and a step of emitting a light beam, Generating a beam from one side of the channel; receiving a beam of light, receiving a beam that is not obscured by the moving target on the other side of the channel; determining a contour step, based on the received beam and the measured The moving speed of the moving target determines an outline of at least a portion of the moving target; and an identifying step of comparing the at least one portion of the contour with the information of the pre-stored moving target to determine the type of the moving target.
  • a system for identifying a moving target includes: a passage through which the moving target passes; a speed measuring device for measuring a moving speed of the moving target; a light emitting device and a light receiving device, wherein the light emitting device a device disposed on one side of the channel for emitting a light beam into the channel, and a light receiving device disposed on the other side of the channel for receiving a light beam that is not blocked by the moving target; determining a contour device, the determining contour device Determining an outline of at least a portion of the moving target according to a light beam received by the light receiving device and a moving speed of the moving target measured by the speed measuring device; and identifying means for contouring the at least one portion and the pre-stored moving target The information is compared to determine the type of moving target.
  • a method for performing radiation imaging inspection on a moving target including the above method for identifying a moving target, and an inspecting step of determining whether to move the mobile object based on the identified type of moving target is provided
  • the target performs a radiographic examination and a method of performing a radiographic examination.
  • a system for performing radiation imaging inspection of a moving object includes: the above system for identifying a moving target; and a scanning imaging inspection device, wherein the scanning imaging inspection device is identified The type of moving target, determine whether to perform a radiographic examination of the moving target.
  • the control feature of the invention is that the ground sensing coils are respectively installed at the inlet and outlet of the channel, the optical detecting device and the real-time speed measuring radar are installed on both sides of the channel near the accelerator cabin, and the photoelectric switch is installed in the direction of the exit of the channel from the beam of the accelerator. Both sides of the channel at the appropriate distance.
  • the scanning control logic controller comprehensively determines the position of the vehicle, the number of vehicles in the passage, the 'vehicle driving state and the like according to the state change of each sensor, and controls the driver's avoidance, outbound scanning, scanning stop, etc. of the scanning system according to the information.
  • Real-time speed radars measure vehicle travel speed in real time and provide real-time scan trigger pulses to the accelerator.
  • Accelerators, detectors, and imaging devices Scan imaging based on the scan pulses formed by the velocity measurement. Radiation protection devices are used to ensure that the environmental dose around the equipment is within the limits of the regulations. The invention adopts a series of control methods to ensure the safety of the passengers.
  • the invention adopts the above control ideas, and can take corresponding scanning control modes for different vehicles, so that the inspection information of the inspected vehicle is complete, the image index is high, and the dose received by the passengers is the least.
  • the invention can greatly improve the image index of the vehicle to be inspected, increase the type of the vehicle that can be inspected, and greatly reduce the dose accepted by the passengers. Therefore, the rapid radiation imaging inspection equipment can be used in various road bayonet applications.
  • FIG. 1 is a block diagram of a system for identifying a moving target according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a system for identifying a moving target according to an embodiment of the present invention. a top view;
  • FIG. 4 is a flow chart of a method of vehicle type recognition of a moving target, in accordance with an embodiment of the present invention. detailed description
  • the system for identifying a moving target includes: a passage for passing a checked moving object such as a container; a speed measuring device for measuring a moving speed of the moving target; a light emitting device and a light receiving device, wherein the light emitting device is disposed at One side of the channel for emitting a light beam into the channel, and the light receiving device is disposed on the other side of the channel for receiving a light beam that penetrates the moving target; determining a contour device that is received by the light receiving device
  • the moving speed of the moving target measured by the beam and velocity measuring device determines a contour of at least a portion of the moving target; and the identifying means compares the contour of at least a portion of the moving target determined by the determining contouring device with the pre-stored vehicle information,
  • the type of moving target is determined, such as determining whether the moving target is a container
  • a passage 14 for passing a checked moving object such as a container may be set at the customs terminal, airport cargo Checkpoints, highways, etc., where it is necessary to identify and inspect past freight vehicles.
  • a quick-response light curtain switch 2 and a ground-sensing coil 3 for detecting the driving-in passage of the vehicle are provided.
  • the quick-response light curtain switch 2 is mounted on the mounting post on both sides of the passage, the ground-sensing coil 3 Buried below the surface of the channel entrance (near the right side of Figure 2) as the first switch of the vehicle entrance, these two devices are used in combination to determine whether the inspected moving target enters the channel and has entered
  • the vehicles of the channel are counted by the first counter.
  • the first counter may be provided in the fast response light curtain switch 2 and/or the ground sensing coil 3, or may be provided in the control room or separately.
  • a speed measuring radar 7 and a control room (not shown) for measuring the moving speed of the vehicle are provided in the passage.
  • the speed measuring radar 7 is used to measure the moving speed of the moving target to be inspected, and in this embodiment, it can be mounted on the outer wall of the accelerator cabin 9 close to the passage. Alternatively, as a speed measuring device, the speed measuring radar may be replaced by other types of speed measuring devices that obtain speed by measuring the moving time and moving distance of the moving object.
  • the control room is the center of the entire system, and the control unit disposed in the control room can be electrically connected with other various electronic devices in the system to receive electrical signals of the electronic devices and send control signals to the electronic devices to control the operating state thereof. .
  • a vertical protective wall 4, 11 for blocking the penetration of radiation is provided on both sides of the channel, and a vertical detector arm 12 is disposed on the side of the protective wall 4, 11 , and an optical detecting device is disposed on the detector arm 12 5.
  • the optical detecting device 5 is composed of two parts, a transmitter and a receiver, and is respectively installed on both sides of the channel.
  • the both sides are preferably the left side and the right side of the lateral direction of the moving object, alternatively, the upper side and the lower side of the moving object.
  • the beam emitted by the emitter passes through the slit structure and is formed such that the projection on a plane perpendicular to the emission direction and perpendicular to the ground may be a linear parallel beam.
  • the parallel beam should have a higher mobility than the moving target, so that the beam emitted from the transmitter can still have a partial beam reaching the receiver after being blocked by the moving target.
  • the height of the light beam blocked by the moving object indicates the height of the moving target, and it can be said that the amount of the light beam received by the receiver corresponds to the height of the moving target.
  • the emitter emits a parallel beam to the moving object moving in the channel through the slit structure
  • the receiver receives the beam that is not blocked by the moving target from a direction perpendicular to the moving direction of the moving object.
  • a corresponding number of photosensors are provided in the receiver, and the photosensors convert the received optical signals into electrical signals according to a predetermined frequency, and each time a conversion is completed, one sampling is completed to form a set of sampling signals. It will be appreciated that each set of sampled signals corresponds to the height of the portion of the moving target that was scanned by the beam from the emitter during sampling.
  • the determining contouring means is preferably disposed in the control room.
  • Each set of sampling signals generated by the receiver and a signal detected by the speed measuring radar indicating the moving speed of the moving target are transmitted to the determining contour device, and the determining contour device determines the moving target according to each set of the sample signal of the receiver and the signal of the speed measuring radar At least a portion of the outline.
  • the determining contour device processes a set of sample signals received from the receiver from a certain starting time TO.
  • ⁇ can be directly derived from the set of sampled signals.
  • the height H0 of the portion of the moving target that is being scanned by the beam from the emitter at the time of sampling, and the width of the scanned portion of the moving target at this time (i.e., the distance moved from the time of T.) is 0.
  • the area S that has been scanned at this time. H.
  • the width W of the scanned portion at the time is the product of the moving speed V of the moving target and the time difference from T, time to T, and time:
  • the area of the moving target that is scanned from time to time is:
  • a storage device for storing partial contour information of the moving object is further included.
  • the information stored in the storage device may be a specific portion of the vehicle, such as the front portion of the vehicle, or contour information of the side of the pedestrian, and the vehicle includes a manned or loaded vehicle such as a container truck, a van, a passenger car, or a car.
  • the contour information of a specific part of these vehicles is obtained by means of projection and stored in a storage device corresponding to a partial contour of the moving object to be obtained when the recognition is performed, for example, the front end
  • the information of the vehicle stored in the storage device can be updated at any time as the number of vehicles having a new shape on the market increases.
  • the 'identification device compares the contour of the moving object determined by the determining contour device with the vehicle information stored in advance in the storage device one by one until the moving target (such as a container truck) determined by the determining contour device
  • the profile is consistent with the information of a certain moving target (such as a container truck) pre-stored in the storage device to determine the specific type of moving target through the passage 14, such as a container truck.
  • the control unit activates the scanning imaging device 13 to emit a radiation beam to the container to start inspection of the cargo carried by the container truck.
  • the identified moving target is a passenger car, a car, or a pedestrian, etc.
  • the control unit does not activate the scanning imaging device to emit a radiation beam.
  • the scanning imaging device 13 is disposed on the accelerator cabin 9 on both sides of the passage 14. On the wall.
  • the system for recognizing a moving object further includes, for example, an adjuster provided in the control unit, the adjuster converting the received light beam into a receiver according to a moving speed of the moving object measured by the speed measuring radar
  • the frequency of the electrical signal that is, the time interval between two samples, so that the sampling frequency of the receiver corresponds to the moving speed of the measured moving target.
  • a quick response light curtain switch 10 is further disposed on the protective walls 4, U on both sides of the channel 14, and the ground direction is biased toward the exit direction (the left side in FIG.
  • the coil 8, the quick response light curtain switch 10 and the ground sensing coil 8 are used in combination to determine whether the inspected vehicle is away from the passage, and to count the inspected vehicle in the exit passage by the second counter.
  • the second counter may be provided in the fast response light curtain switch 6 and/or the ground sensing coil 8, or may be provided in the control room or separately.
  • the scanning imaging device may be any form of device that inspects an object to be inspected by irradiating a radiation beam such as X-rays, Y-rays, particularly a conventional emission imaging device for inspecting a container.
  • the scanning imaging apparatus includes: an accelerator for emitting a radiation beam to scan a checked moving object such as a vehicle, the accelerator being capable of adjusting a radiation beam according to a speed of the vehicle measured by the speed measuring radar 7 under the control of the control unit a frequency, which in turn controls a scanning frequency to the vehicle; a detector for receiving a radiation beam transmitted from the inspected moving object; and an imaging device that images the radiation beam transmitted from the inspected moving object detected by the detector; And a radiation protection device for ensuring that the amount of radiation beam around the device is limited to an allowable range, thereby protecting workers near the device from radiation beams.
  • the quick response light curtains 2, 10 and the ground sense coils 3, 8 for detecting the entry or exit of the vehicle, respectively, are described, but the present invention is not limited thereto, for example , one of the light curtain switch and the ground coil can be used to detect the entry and exit of the vehicle. It should be noted that, according to the characteristics of the ground coil, only when the contact area of the moving object and the ground coil moving in the channel 14 reaches a certain level, the ground coil generates a signal (positive signal) for detecting the moving target.
  • the light curtain switches 2, 10 can also be replaced by conventional photodetectors.
  • the ground coils 3, 8 may be replaced by at least one of a photodetector, a piezoelectric detector, an electronic sensor, a microwave sensor, an ultrasonic sensor, and a pressure sensor.
  • the present invention also provides a method for identifying a moving target, comprising the steps of: driving into a step (S10), moving a target such as a container truck, a van, a passenger car, a car, and the like.
  • Driving into the channel 14 speed measuring step (S20) for measuring the movement using a speed measuring device such as a speed measuring radar 7
  • the moving speed of the moving target in the specific 14 the step of emitting a light beam (S30), using the emitter to emit a pupil from one side of the channel to the moving target, the light beam being projected on a plane perpendicular to the emission direction and perpendicular to the ground It may be a straight line or a flat shape having a certain width.
  • the receiver receives the light beam that is not blocked by the moving target on the other side of the channel, and converts the light beam signal into an electrical signal through a plurality of photoelectric sensors disposed in the receiver,
  • the height of the beam occluded by the moving object indicates the height of the moving object
  • the converted electrical signal corresponds to the height of the portion of the moving object that is scanned by the beam from the emitter.
  • the frequency at which the received light beam is converted into an electric signal is adjusted in accordance with the moving speed of the moving object, so that the switching frequency corresponds to the moving speed of the measured moving target.
  • the contour determining means determines the contour of at least a portion of the moving object based on the electrical signal generated by the receiver and the measured moving speed of the moving target.
  • the contour is consistent with the information of a certain moving object (such as a container truck) pre-stored in the storage device, and the specific type of moving target through the passage 14, such as a container truck, is determined.
  • a method for performing radiation imaging inspection on a moving target comprising the steps of: identifying a type of a moving target by using the above method for identifying a moving target; and checking a step (S70), using the scanning imaging device Determining the type of the moving target, determining whether to perform a radiation imaging inspection on the moving target, if the identified moving target is a passenger car, a car, or a pedestrian, etc., the control unit does not activate the scanning imaging device to emit a radiation beam; if it is identified When the moving target is a freight vehicle such as a container truck, the scanning imaging device is activated to emit a radiation beam to start a radiation beam inspection on the moving target; further, the radiation imaging inspection method is determined according to the specific type of the freight vehicle, for example: if it is a container truck , delaying for a long period of time, after the cab part passes through the radiation beam scanning area, and then starts the radiation beam inspection of the container truck to achieve the protection of the driver; if it is a box truck
  • a method for recognizing a moving object and a method for performing a radiation imaging inspection on a moving object further comprising determining whether a moving target such as a vehicle enters a channel (S11), and if it is determined that the moving target enters the channel, initiating recognition program.
  • the system is in standby when the number of vehicles in the channel is 0.
  • the ground sense line Circle 3 is effective first, and combined with the quick response light curtain switch 2 to complete the judgment of the vehicle entering the passage and the direction of travel, if the vehicle enters the passage, the count value of the first counter indicating the number of vehicles in the passage is increased by 1, the speed radar 7 The vehicle travel speed is measured and the system enters the ready state.
  • the vehicle continues to move forward, and the optical detecting device 5 measures the external contour feature of the vehicle in real time.
  • the system judges that the passing vehicle is a truck, a box truck, a passenger car according to a certain characteristic or external contour feature of the vehicle, and correspondingly according to the recognition result. Scanning strategy.
  • the scanning inspection is started to ensure the safety of the passengers; Scanning inspections can also be carried out with a licensed dose if the regulations permit.
  • the system monitors the accelerator's operating status in real time to ensure that the accelerator does not miss the beam.
  • the count value of the second counter representing the vehicle in the channel is incremented by one. As long as the count value of the second counter and the value of the first counter are not equal, the scanning imaging device of the inspection device remains in the ready-to-operate state; when the two are equal, the scanning imaging device enters the standby state.
  • the first and second counters may also be replaced by a receiver, that is, when the vehicle enters the channel, the counter is incremented by one, and the count is decremented by one when the vehicle travels out of the scanning channel. As long as the count value of the counter is not 0, the system remains in the working state; when the number of vehicles in the channel is 0, the system enters the standby state.
  • the transmitter and the receiver are respectively located on the left and right sides of the lateral direction of the vehicle.
  • the illuminating device and the light receiving device can be located on the upper side and the lower side of the vehicle, respectively.
  • one of the light-emitting device and the light-receiving device may be disposed on the frame, and the other may be disposed below the surface of the channel.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Traffic Control Systems (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Description

对移动目标辐射成像检查的方法和系统 技术领域
本发明的实施例涉及对移动目标进行识别的方法和系统， 特别是涉及在对不同 的移动目标釆取不同辐射束检査方式的对移动目标辐射成像检査的方法和系统。 背景技术
利用高能射线对车辆进行快速辐射成像检査的设备中， 驾驶室的自动避让通常 采用的是车辆最前端行驶到通道出口方向某一固定位置后， 系统再进行扫描检查。 由于不同车辆的外形差别很大， 这种避让方式必须保证驾驶室最大的车辆能够安全 避让， 那么对于小型车辆检査就会产生图像信息不完整， 甚至有的小车根本无法检 查。 而对于集卡车检査图像则又存在不需要的多余信息。 这种检查方式限制了辐射 源的能量和剂量率， 致使有些车辆不能检査、 检查图像指标低、 存在多余的信息或 者信息不完整、 不能保证司乘所接受的辐射剂量最少。 因此需要一种能够按用途自 动分类的车辆外形识别系统为快速检查系统提供适宜的扫描方案。
传统的用于收费的车型识别系统只是测量车辆的高度和车辆长度， 进而通过车 辆的大小判别收费标准。 传统的车型识别系统不能按车辆的用途进行分类， 不能识 别是客车还是货车。 发明内容
为了克服上述现有技术中的缺陷， 本发明的目的是提供一种对移动目标进行识 别的方法和系统、 以及对移动目标辐射成像检查的方法和系统。 它可对满足一定速 度范围内的正常行驶车辆进行自动车型识别， 并根据不同的车型釆取不同的扫描控 制方式进行自动成像、 检查。 在车辆行进过程中自动进行车型识别并检査， 不需要 司乘人员下车， 在保证图像信息完整的前提下使司乘人员接受的辐射剂量最少。
根据本发明的一方面， 提供一种对移动目标进行识别的方法， 包括如下步骤- 驶入步骤， 使移动目标进入通道； 速度测量步骤， 用于测量移动目标的移动速度； 发出光束的步骤， 从所述通道的一侧发出光束； 接收光束的步骤， 在所述通道的另 一侧接收没有被移动目标遮挡的光束； 确定轮廓步骤， 根据所接收的光束和所测量 的移动目标的移动速度确定移动目标的至少一部分的轮廓； 以及识别步骤， 将所述 至少一部分的轮廓和预先存储的移动目标的信息进行比较， 进而确定移动目标的类 型。
根据本发明的另一方面， 提供一种对移动目标进行识别的系统， 包括： 移动目 标经此通过的通道； 速度测量装置， 用于测量移动目标的移动速度； 发光装置和光 接收装置， 其中发光装置设置在通道的一侧， 用于向所述通道内发射光束， 而光接 收装置设置在通道的另一侧， 用于接收没有被移动目标遮挡的光束； 确定轮廓装 置， 所述确定轮廓装置根据所述光接收装置所接收的光束和所述速度测量装置所测 量的移动目标的移动速度确定移动目标的至少一部分的轮廓； 以及识别装置， 将所 述至少一部分的轮廓和预先存储的移动目标的信息迸行比较， 进而确定移动目标的 类型。
根据本发明进一步的方面， 提供一种对移动目标进行辐射成像检查的方法， 包 括上述对移动目标进行识别的方法； 以及检査步骤， 根据所识别出的移动目标的类 型， 确定是否对该移动目标进行辐射成像检査、 以及进行辐射成像检查的方式。
根据本发明更进一歩的方面， 提供一种对移动目标进行辐射成像检查的系统， 包括： 上述对移动目标进行识别的系统； 以及扫描成像检查装置， 所述扫描成像检 査装置根据所识别出的移动目标的类型， 确定是否对该移动目标进行辐射成像检 查。
本发明的控制特点是， 地感线圈分别安装在通道入口和出口位置， 光学检测装置 和实时测速雷达安装在加速器舱体附近的通道两侧， 光电开关安装在通道出口方向 上距加速器束流缝适当距离的通道两侧。 由扫描控制逻辑控制器根据各传感器的状 态变化综合判断车辆的位置， 通道内车辆的数量, '车辆行驶状态等信息， 并根据这 些信息控制扫描系统的司机避让、 出束扫描、 扫描停止等动作。 实时测速雷达实时 测量车辆行驶速度并为加速器提供实时扫描触发脉冲。 加速器、 探测器和成像装置 根据测速形成的扫描脉冲进行扫描成像。 辐射防护装置用于保证设备周边的环境剂 量限定在法规允许范围之内。 本发明采用一系列的控制方法保证司乘人员的安全。
本发明由于釆用了上述的控制思路， 可以对不同车辆釆取相应的扫描控制方 式， 使被检车辆检査信息完整， 图像指标高， 司乘人员接受的剂量最少。 同现有技 术相比， 本发明可大大提高被检车辆图像指标， 增加可检查车辆的种类、 大大减少 司乘人员接受的剂量。 从而可使快速辐射成像检查设备在各类公路卡口场合使用。 下面结合附图和具体的实施方式对本发明作进一步的说明。 附图说明
图 1是根据本发明的实施例的对移动目标进行识别的系统的方框图； 图 2是根据本发明的实施例的对移动目标进行识别的系统的结构示意图； 图 3是图 1所示系统的俯视示意图； 以及
图 4是根据本发明的实施例的对移动目标进行车型识别的方法的流程图。 具体实施方式
下面将参照附图 1和 2对作为本发明的一个示例性实施例的车辆检查设备的结构 和工作过程进行详细说明。
参看附图 1， 本发明的对移动目标进行识别的系统和对移动目标迸行快速辐射 成像检查的系统的方框图。 该对移动目标进行识别的系统包括： 供诸如载有集装箱 之类的受检查移动目标通过的通道； 速度测量装置， 用于测量移动目标的移动速 度； 发光装置和光接收装置， 其中发光装置设置在通道的一侧， 用于向通道内发射 光束，. 而光接收装置设置在通道的另一侧， 用于接收穿透移动目标的光束； 确定轮 廓装置， 该确定轮廓装置根据光接收装置所接收的光束和速度测量装置所测量的移 动目标的移动速度确定移动目标的至少一部分的轮廓； 以及识别装置， 将由确定轮 廓装置所确定的移动目标的至少一部分的轮廓和预先存储的车辆信息进行比较， 进 而确定移动目标的类型， 比如确定移动目标是集装箱卡车、 箱式货车、 客车、 小汽 车、 或者是行人。
更具体地说， 参见图 2和 3， 在根据本发明的对移动目标进行识别的系统中， 供 诸如载有集装箱之类的受检査移动目标通过的通道 14可以设置在海关码头、 机场货 运检査站、 高速公路等需要对过往的货运车辆进行识别检查的场所。 在通道的入口 处， 设置用于检测车辆驶入通道的快速响应光幕开关 2和地感线圈 3， 优选地， 快速 响应光幕开关 2安装在通道两侧的安装立柱上， 地感线圈 3埋设于通道入口 （附图 2的 右侧附近） 的地表下面作为车辆入口的第一个开关， 这两个装置结合使用， 用于判 别受检査移动目标的是否进入所述通道并对已进入通道的车辆通过第一计数器进行 计数。 该第一计数器可以设置在快速响应光幕开关 2和 /或地感线圈 3中， 也可以设置 在控制室中或单独设置。 在通道中设有用于测量车辆的移动速度的测速雷达 7和控制室 （未示出） 。 测速 雷达 7用于测量受检查移动目标的移动速度， 在本实施例中可以安装在加速器舱体 9 靠近通道的外墙上。 可供选择地， 作为一种测速装置， 测速雷达也可以由通过测量 移动目标的移动时间和移动距离而获得速度的其它类型的测速装置代替。 控制室是 整个系统的中心， 设置在控制室内的控制单元可以与系统中的其它各种电子设备进 行电连接， 以接收这些电子设备的电信号并向这些电子设备发出控制信号进而控制 其操作状态。
在通道两侧设置垂直的用于阻止辐射线穿透的防护墙 4、 11， 并在防护墙 4、 11 夕卜侧的设置垂直的探测器臂 12， 探测器臂 12上设有光学检测装置 5， 该光学检测装 置 5 都由发射器和接收器两部分组成， 并分别安装在通道的两侧。 所述两侧优选是 移动目标的横向方向的左侧和右侧， 可供选择地， 也可以是移动目标的上侧和下 侧。 该发射器所发出的光束经过狭缝结构， 并且形成为在与发射方向垂直并与地面 垂直的平面上的投影可以为直线形的平行光束。 可以理解， 该平行光束的髙度应该 高于移动目标的高度， 以便从发射器发出的光束在被移动目标遮挡之后， 仍然能够 有部分光束达到接收器。 在这种情况下， 被移动目标遮挡的光束的高度就表示移动 目标的高度， 也可以说， 被接收器接收的光束的多少与移动目标的高度相对应。
发射器通过狭缝结构向正在通道中移动的移动目标发出平行光束， 接收器从与 移动目标的移动方向垂直的方向接收未被移动目标遮挡的光束。 在接收器中设有相 应数量的光电传感器， 这些光电传感器按照预定的频率将接收的光信号转换成电信 号， 每完成一次转换， 就完成了一次采样， 形成一组采样信号。 可以理解， 每组釆 样信号都对应于采样时移动目标的、 被来自于发射器的光束扫描的那部分的高度。
在根据本发明的对移动目标进行识别的系统中， 确定轮廓装置优选设置在控制 室中。 接收器产生的每组采样信号和测速雷达检测的表示移动目标移动速度的信号 都传输到该确定轮廓装置， 该确定轮廓装置根据接收器的每组釆样信号和测速雷达 的信号确定移动目标的至少一部分的轮廓。
具体而言， 该确定轮廓装置从某一开始时刻 TO开始对从接收器接收的一组釆样 信号进行处理。 从上面的讨论可知， 从该组采样信号中可以直接得出 τ。时刻釆样时 移动目标的、 正被来自于发射器的光束扫描的那部分的高度 H0， 而此时移动目标的 已被扫描部分的宽度 (即从 T。时刻起移动的距离） 为 0, 此时已扫描的面积 S。=H。 而在 ^时刻对移动目标进行第二次扫描时， 从第二组釆样信号中可以直接得出
T,时刻釆样时移动目标的、 正被扫描的那部分的高度 Hl ;
假设移动目标以速度 V勾速移动， 那么从 T。时刻起被扫描部分的宽度 W,为移动 目标的移动速度 V与从 T,时刻到 T,时刻的时间差的乘积， 即：
W, =Vx (T -T„) ； '
从而， 从 T。时刻起被扫描的移动目标的面积为：
S, =H, X W,=H, X Vx (Τ,-Τη) 。
依此类推， 可以得出， 在 Τη 时刻扫描时， 从 ,时刻起已被扫描部分的面积 为：
S„ = Hn X W„=Hn X Vx ( T„一 Tn-I ) 。
这样， 经过 η次采样， 就可得到 η个扫描面积， 将所得到的 η个扫描面积叠加 则可得到类似被扫描移动目标的轮廓。
在根据本发明的对移动目标进行识别的系统中， 还包括用于存储移动目标的部 分轮廓信息的存储装 ¾。 存储装置中存储的信息可以是车辆的特定部分， 比如车头 部分， 或行人的侧部的轮廓信息， 车辆包括集装箱卡车、 箱式货车、 客车、 小汽车 等载人或载货的车辆。 在设置整个识别系统时， 釆用投影的方式获得这些车辆的特 定部分的轮廓信息并存储在存储装置中， 该特定部分与进行识别时将要获得的移动 目标的部分轮廓相对应， 比如都是车头部分的轮廓， 如果是行人的话， 则获得整个 人的外形轮廓。 并且可以随市场上具有新外形的车辆的增加， 随时更新存储在存储 装置中的车辆的信息。
在控制单元的控制下， '识别装置将由确定轮廓装置所确定的移动目标的轮廓和 预先存储在存储装置中的车辆信息逐一进行比较， 直到由确定轮廓装置所确定的移 动目标 （比如集装箱卡车） 的轮廓和预先存储在存储装置中的某种移动目标 （比如 集装箱卡车） 的信息一致， 就确定出通过通道 14的移动目标的具体类型， 比如为集 装箱卡车。
进一步地， 如果识别出移动目标的具体类型， 比如移动目标为集装箱卡车， 则 控制单元启动扫描成像装置 13 向集装箱发射辐射束， 开始对集装箱卡车运载的货物 进行检查。 这样就构成了根据本发明的对移动目标进行辐射成像检查的系统。 如果 识别出的移动目标为客车、 小汽车、 或者行人等， 则控制单元不启动扫描成像装置 发射辐射束。 在一种实施例中， 扫描成像装置 13设置在通道 14两侧的加速器舱体 9 的墙壁上。
进一步， 根据本发明的对移动目标进行识别的系统还包括比如设置在控制单元 中的调节器， 该调节器根据由测速雷达测量的移动目标的移动速度， 调节接收器将 所接收的光束转换成电信号的频率， 即两次采样之间的时间间隔， 以使接收器的釆 样频率与所测量的移动目标的移动速度相对应。 进一歩地， 在位于通道 14两侧的防护墙 4、 U上进一步设置快速响应光幕幵关 10, 并在通道 14的地表面下偏向于出口方向 （图 2中的左侧） 设置地感线圈 8， 快速 响应光幕开关 10和地感线圈 8结合用于判别受检査车辆是否离幵所述通道， 并通过第 二计数器对驶出通道内的受检査车辆进行计数。 该第二计数器可以设置在快速响应 光幕开关 6和 /或地感线圈 8中， 也可以设置在控制室中或者单独设置。
扫描成像装置可以是通过辐射诸如 X射线、 Y射线之类的辐射束对被检查目标 进行检查的任何形式的装置， 特别是传统的用于检查集装箱的发射成像装置。 扫描 成像装置包括： 加速器， 用于发射辐射束以对诸如车辆之类的受检查移动目标迸行 扫描， 该加速器可在控制单元的控制下， 根据测速雷达 7所测量的车辆的速度调整辐 射束的频率， 进而控制对车辆的扫描频率； 探测器， 用于接收从受检查移动目标透 射的辐射束； 成像装置， 根据探测器所探测到的从受检査移动目标透射的辐射束进 行成像； 和辐射防护装置， 用于保证设备周边的辐射束的量限定在允许范围之内， 从而保护有可能靠近设备周围的工作人员免受辐射束的伤害。
在本发明的上述实施例中， 描述了分别用于检测车辆的驶入或者驶出的快速响 应光幕幵关 2、 10和地感线圈 3、 8， 但本发明并不局限于此， 比如， 可以使用光幕 开关和地感线圈中的其中之一检测车辆的驶入和驶出。 需要说明的是， 根据地感线 圈的特性， 仅当在通道 14 内移动的移动目标与地感线圈的接触面积达到一定程度 时， 地感线圈才产生检测到移动目标的信号 （肯定信号） 。
进一歩地， 光幕开关 2、 10也可以由传统的光电检测器代替。 可供选择地， 地感 线圈 3、 8也可以由光电检测器、 压电检测器、 电子传感器、 微波传感器、 超声波传 感器、 压力传感器中的至少一种代替。
参见图 4, 根据另一方面， 本发明还提供一种对移动目标进行识别的方法， 包 括如下步骤： 驶入步骤 （S10) , 使诸如集装箱卡车、 箱式货车、 客车、 小汽车等移 动目标驶入通道 14; 速度测量步骤 （S20) ， 用于利用测速雷达 7等测速装置测量移 动目标的在特定 14 中的移动速度； 发出光束的步骤 （S30) ， 利用发射器从通道的 一侧向移动目标发出光朿， 该光束在与发射方向垂直并与地面垂直的平面上的投影 可以为直线形， 也可以是具有一定宽度的平面形。
在接收光束的步骤 （S40) 中， 利用接收器在通道的另一侧接收没有被移动目标 遮住的光束， 并将该光束信号通过设置在接收器中的多个光电传感器转换成电信 号， 在这种情况下， 被移动目标遮挡的光束的高度就表示移动目标的高度， 而且被 转换的电信号对应于釆样时移动目标的、 被来自于发射器的光束扫描的那部分的高 度。 进一步地， 在该接收光束的步骤中， 根据移动目标的移动速度调整将接收的光 束转换成电信号的频率， 使该转换频率与所测量的移动目标的移动速度相对应。
之后， 在确定轮廓步骤 （S50) 中， 利用确定轮廓装置根据接收器产生的电信号 和所测量的移动目标的移动速度确定移动目标的至少一部分的轮廓。
识别步骤 （S60) ， 利用识别装置将已确定的至少一部分的轮廓和预先存储在存 储装置中的移动目标的相应部分的轮廓的信息逐一进行比较， 直到所确定的移动目 标 （比如集装箱卡车） 的轮廓和预先存储在存储装置中的某种移动目标 （比如集装 箱卡车） 的信息一致， 就确定出通过通道 14的移动目标的具体类型， 比如为集装箱 卡车。
进一步地， 提供一种对移动目标进行辐射成像检査的方法， 包括如下步骤： 利 用上述对移动目标进行识别的方法识别出移动目标的类型； 以及检查步骤 （S70) ， 利用扫描成像装置根据所识别出的移动目标的类型， 确定是否对该移动目标进行辐 射成像检查， 如果识别出的移动目标为客车、 小汽车、 或者行人等， 则控制单元不 启动扫描成像装置发射辐射束； 如果识别出移动目标为集装箱卡车等货运车辆， 则 启动扫描成像装置发射辐射束开始对移动目标进行辐射束检査； 进一步地， 还根据 货运车辆的具体类型确定辐射成像检查的方式， 比如： 如果是集装箱卡车， 则延迟 较长的时间， 使驾驶室部分通过辐射束扫描区域之后， 再开始对集装箱卡车进行辐 射束检查， 以实现对驾驶员的保护； 如果是箱式货车， 则延迟相对较少的时间。
根据本发明的对移动目标进行识别的方法和对移动目标进行辐射成像检查的方 法， 还包括判断诸如车辆之类的移动目标是否进入通道 （S11 ) ， 如果判断到移动目 标进入通道， 则启动识别程序。
下面以识别和检査进入通道的车辆为例， 说明本发明的工作过程：
' 在通道内车辆数为 0时系统处于待机状态， 当一辆车 1A向通道驶来时， 地感线 圈 3 首先有效， 并结合快速响应光幕开关 2 完成对车辆进入通道和行驶方向的判 另 IJ , 若车辆驶入通道则使表示通道内车辆数目的第一计数器的计数值加 1， 测速雷达 7对车辆行驶速度进行测量， 系统进入就绪状态。 车辆继续向前行驶， 光学检测装置 5实时测量车辆外部轮廓特征， 系统根据车辆的某个显著特征或外部轮廓特征判断通 过的车辆是集卡车、 箱式货车、 客车， 并根据识别结果釆取相应的扫描策略。 针对 集卡车釆取扫描集装箱有效长度， 不产生多余的信息； 针对箱式货车釆取驾驶室离 开射线面到安全距离后才开始扫描检査， 保证司乘人员的安全； 针对客车则釆取不 扫描检查， 在法规许可的情况下也可以釆用许可剂量进行扫描。 在驾驶室通过扫描 区域时， 系统实时监测加速器工作状态， 确保加速器不会误出束。 当车辆行驶出扫 描通道时， 则使表示通道内车辆的第二计数器的计数值加 1。 只要第二计数器的计数 值和第一计数器的值不相等， 检査设备的扫描成像装置就保持在就绪工作状态； 当 二者相等时， 扫描成像装置进入待机状态。
可供选择地， 第一和第二计数器也可以由一个接收器代替， 即车辆驶入通道 时， 计数器加 1， 当车辆行驶出扫描通道时， 计数减 1。 只要计数器的计数值不为 0， 系统就保持在继续工作状态； 当通道内车辆数量为 0时， 系统进入待机状态。
值得说明的是， 按照本发明的技术方案， 将上述实施例中的技术特征， 其中光 学检测装置可以做以下技术特征等同替换， 例如利用多只间隔一定距离光电开关进 行车辆外观测量。 总之这些技术特征的替换釆取的是本领域技术人员公知技术所形 成的技术方案均应属于本发明的保护范围。
此外， 尽管本发明的实施例中， 发射器和接收器分别位于车辆的横向方向的左侧 和右侧。 然而， 很明显， 发光装置和光接收装置可以分别位于车辆的上侧和下侧。 在这种情况下， 发光装置和光接收装置中的一个可以设置在框架上， 而另一个可以 设置在通道的表面之下。
尽管已经示出并描述了本发明的一些实施例， 然而本领域的技术人员可以了解， 在不脱离本发明的原理和精髓的情况下能够对这些实施例作出改动， 本发明的保护 范围限定在权利要求及其等同物中。

Claims

权 利 要 求
1. 一种对移动目标进行识别的方法， 包括如下步骤：
驶入歩骤， 使移动目标进入通道；
速度测量步骤， 用于测量移动 g标的移动速度；
发出光束的步骤， 从所述通道的一侧发出光束；
接收光束的步骤， 在所述通道的另一侧接收没有被移动目标遮挡的光束； 确定轮廓步骤， 根据所接收的光束和所测量的移动目标的移动速度确定移动目 标的至少一部分的轮廓； 以及
识别步骤， 将所述至少一部分的轮廓和预先存储的移动目标的信息进行比较， 进而确定移动目标的类型。
2. 根据权利要求 1所述的对移动目标进行识别的方法， 其中， 在接收光束的步 骤中， 根据移动目标的移动速度调整将接收的光束转换成电信号的转换频率， 使该 转换频率与所测量的移动目标的移动速度相对应。
3. 根据权利要求 1所述的对移动目标进行识别的方法， 其中， 在接收光束的步 骤中， 将所接收的光束转换成电信号。
4. 根据权利要求 1所述的对移动目标进行车型识别的方法， 其中， 在驶入步骤 中， 还包括检测移动目标是否进入通道的步骤。
5. 根据权利要求 1所述的对移动目标进行车型识别的方法， 其中， 所述发出的 光束在与发射方向垂直的平面上的投影为直线形。
6. 根据权利要求 4所述的对移动目标进行识别的方法， 其中所述所发出的光束 为平行光束。
7. 根据权利要求 1所述的对移动目标进行识别的方法， 其中所述一侧和所述另 一侧分别是移动目标的横向方向的左侧和右侧、 或者分别是移动目标的上侧和下
8. 一种对移动目标进行识别的系统， 包括- 移动目标经此通过的通道；
速度测量装置， 用于测量移动目标的移动速度；
发光装置和光接收装置， 其中发光装置设置在通道的一侧， 用于向所述通道内 发射光束， 而光接收装置设置在通道的另一侧， 用于接收没有被移动目标遮挡的光 束；
确定轮廓装置， 所述确定轮廓装置根据所述光接收装置所接收的光束和所述速 度测量装置所测量的移动目标的移动速度确定移动目标的至少一部分的轮廓； 以及 识别装置， 将所述至少一部分的轮廓和预先存储的移动目标的信息进行比较， 进而确定移动目标的类型。
9. 根据权利要求 8所述的对移动目标进行识别的系统， 进一步包括调节器， 所 述调节器根据由所述速度测量装置测量的移动目标的移动速度调整所述光接收装置 将接收的光束转换成电信号的转换频率， 使该转换频率与所测量的移动目标的移动 速度相对应
10. 根据权利要求 8 所述的对移动目标进行识别的系统， 其中所述接收器将所 接收的光束转换成电信号。
11. 根据权利要求 7 所述的对移动目标进行识别的系统， 还包括第一检测装 置， 所述第一检测装置设置在所述通道入口， 用于判断是否有移动目标驶入通道。
12. 根据权利要求 7 所述的对移动目标进行识别的系统， 其中所述一侧和所述 另一侧分别是移动目标的横向方向的左侧和右侧、 或者分别是移动目标的上侧和下
.
13. 一种对移动目标进行辐射成像检査的方法， 包括如下步骤- 驶入步骤， 使移动目标进入通道；
速度测量步骤， 测量移动目标的移动速度；
发出光束的步骤， 从所述通道的一侧发出光束；
接收光束的步骤， 在所述通道的另一侧接收没有被移动目标遮挡的光束； 确定轮廓步骤， 根据所接收的光束和所测量的移动目标的移动速度确定移动目 标的至少一部分的轮廓；
识别步骤， 将所述至少一部分的轮廓和预先存储的移动目标的信息进行比较， 进而确定移动目标的类型； 以及
检查步骤， 根据所识别出的移动目标的类型， 确定是否对该移动目标进行辐射 成像检査、 以及进行辐射成像检查的方式。 '
14. 一种对移动目标进行辐射成像检查的系统， 包括：
移动目标经此通过的通道； 速度测量装置， 用于测量移动目标的移动速度；
发光装置和光接收装置， 其中发光装置设置在通道的一侧， 用于向所述通道内 发射光束， 而光接收装置设置在通道的另一侧， 用于接收没有被移动目标遮挡的光 束；
确定轮廓装置， 所述确定轮廓装置根据所述光接收装置所接收的光束和所述速 度测量装置所测量的移动目标的移动速度确定移动目标的至少一部分的轮廓；
识别装置， 将所述至少一部分的轮廓和预先存储的移动目标的信息进行比较， 进而确定移动目标的类型； 以及
扫描成像检查装置， 所述扫描成像检査装置根据所识别出的移动目标的类型， 确 定是否对该移动目标进行辐射成像检査。
PCT/CN2006/003574 2006-10-13 2006-12-25 Procédé permettant d'analyser un type d'objet en mouvement et son système et procédé d'imagerie et de détection de l'objet en mouvement et du système WO2008046261A1 (fr)

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US9817151B2 (en) 2008-02-28 2017-11-14 Rapiscan Systems, Inc. Drive-through scanning systems
US10754058B2 (en) 2008-02-28 2020-08-25 Rapiscan Systems, Inc. Drive-through scanning systems
US11579328B2 (en) 2008-02-28 2023-02-14 Rapiscan Systems, Inc. Drive-through scanning systems
US12061309B2 (en) 2008-02-28 2024-08-13 Rapiscan Systems, Inc. Drive-through scanning systems
CN107228869A (zh) * 2017-06-29 2017-10-03 北京君和信达科技有限公司 辐射检查系统和辐射检查方法

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BRPI0622243A2 (pt) 2011-12-27
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RU2396512C2 (ru) 2010-08-10
CN101162507A (zh) 2008-04-16
JP2009508276A (ja) 2009-02-26
AU2006346223A1 (en) 2008-05-01
PL2575118T3 (pl) 2014-03-31
AU2006346223B2 (en) 2010-10-28
EP2575118A4 (en) 2013-04-03
RU2008103708A (ru) 2009-08-10
MY151009A (en) 2014-03-31
EP2575118A1 (en) 2013-04-03
BRPI0622243B1 (pt) 2020-02-27
US7911592B2 (en) 2011-03-22
CN101162507B (zh) 2010-05-12
JP4701290B2 (ja) 2011-06-15

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