CN108897055A - A kind of method for controlling radiation source and fast general formula safe examination system - Google Patents
A kind of method for controlling radiation source and fast general formula safe examination system Download PDFInfo
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Abstract
The invention discloses a kind of method for controlling radiation source, including：After radiation source starts transmitting the first radiation beam scanning detected material, detector signal is obtained by radiation beam detector；By image recognition algorithm to detector signal carry out image recognition processing, with detect present scanning position whether be detected material boundary position；When detecting present scanning position is the boundary position of detected material, control radiation source starts to emit the second radiation beam.The invention also discloses a kind of fast general formula safe examination systems.The boundary position of vehicle cab and cargo area can be accurately and quickly judged using the present invention.
Description
The invention has the following application numbers: 201610102115.0, filing date: 2016, 2, 24 days, named: the invention patent application of 'a radiation source control method and a quick pass type security inspection system' is divided into divisional applications.
Technical Field
The invention relates to the technical field of radiation imaging, in particular to a radiation source control method and a quick pass type security inspection system using the same.
Background
In the process of vehicle safety inspection, the non-stop inspection technology based on the radiation source automatic scanning flow control has very high passing rate and high safety inspection efficiency. In the non-stop inspection technology, in order to ensure the safety of a driver in a cab, the cab needs to be subjected to radiation avoidance, namely, only after the cab leaves a radiation inspection position, a high-energy and high-dose-rate radiation beam is allowed to be emitted, and only goods in a cargo compartment behind the cab are scanned and inspected. Because the cab is not scanned and checked, a security hole exists. To eliminate this security hole, a full-vehicle differential scanning technique may be employed to inspect the cab portion of the vehicle with low or low dose rate radiation that meets radiation safety standards, while inspecting the cargo compartment portion with high or high dose rate radiation. The premise of the non-stop inspection technology is that the position of the cab needs to be accurately judged, and the safety of personnel in the cab is directly influenced by the accuracy of judgment.
The present radiation source control scheme for vehicle non-stop inspection mostly utilizes hardware devices such as ground induction coil, light curtain, photoelectric sensor, laser distance sensor, laser scanner to discern the driver's cabin position, can satisfy the user demand to a certain extent, but still has following drawback: on one hand, hardware equipment such as sensors and the like needs to be specially installed and arranged, the early investment cost is high, various equipment is easily influenced by the environment (such as rain, snow, wind, sand and the like), the equipment failure rate is high, and the maintenance cost is high; on the other hand, hardware devices such as sensors are easily affected by vehicle decorations, coverings and the like to generate recognition errors, so that the cargo compartment is missed to be scanned, and even the cab is scanned by mistake.
Disclosure of Invention
In view of the above, the present invention provides a radiation source control method and a fast pass safety inspection system, which process the scanned image of each radiation pulse in real time, and determine whether the protection area of the vehicle (or the entire vehicle) has passed through the scanning position by using an image analysis method.
The invention provides a radiation source control method, which comprises the following steps: after the radiation source starts emitting the first radiation beam to scan the detected object, the detector signal I is acquired by the radiation beam detectoriWhere i is the sequence number of the detector signal, i is 0,1,2, …, n; carrying out image recognition processing on the detector signal through an image recognition algorithm to detect whether the current scanning position is the boundary position of the detected object; when the current scanning position is detected to be the boundary position of the detected object, controlling the radiation source to start emitting a second radiation beam; wherein the boundary position refers to a gap between a first part and a second part of the detected object, and the current scanning position and the s-th detector signal IsAnd correspondingly.
The invention also provides a quick pass type security inspection system, which comprises: at least one radiation source for emitting at least two radiation beams; radiation beam detector for acquiring a plurality of detector signals IiWhere i is the sequence number of the detector signal, i is 0,1,2, …, n; the image recognition algorithm module is used for carrying out image recognition processing on the detector signal so as to detect whether the current scanning position is the boundary position of the detected object; a radiation source control module for controlling the radiation sourceWhen the current scanning position is detected to be the boundary position of the detected object, controlling the radiation source to start emitting the appointed radiation beam; wherein the boundary position refers to a gap between a first part and a second part of the detected object, and the current scanning position and the s-th detector signal IsAnd correspondingly.
According to the embodiment of the invention, the boundary position of the cab and the goods area is identified for the vehicle image acquired by radiation imaging, so that the radiation source is controlled to emit proper rays, the purpose of vehicle inspection is achieved, the whole process is not influenced by environmental factors and also not influenced by a boundary position covering object, the use number of sensors can be reduced to the maximum extent, the installation and maintenance cost is reduced, and the detection reliability is high.
Drawings
Fig. 1-3 are a gray scale map, a binary map and related calculated values of three vehicle models according to the embodiment of the invention.
Fig. 4 is a flow chart of a radiation source control method of an embodiment of the invention.
Fig. 5 to 7 are flowcharts of three processing procedures of the image recognition algorithm in the embodiment of the present invention, respectively.
FIG. 8 is a flowchart illustrating an embodiment of the present invention controlling a radiation source to stop emitting a radiation beam.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
The driver's cab of a cargo vehicle and other areas that can accommodate passengers are often a whole, called the front, the cargo area behind the front being the cargo compartment, with a gap between the front and the cargo compartment. The width of this gap may vary for different models of truck. The gap width between the head and the cargo compartment of the truck in fig. 1 is larger, and the gap width in fig. 2 is smaller. Unlike a truck, the front and rear seats of the passenger vehicle compartment can accommodate passengers, so that the passenger vehicle itself is a whole body without any gap in the vehicle body, as shown in fig. 3.
The basic idea of the embodiment of the invention is to detect the integrity of the scanned object through the radiation image to judge whether the protection area (the head of a truck or the whole passenger vehicle) of the detected vehicle passes through the scanning area. According to the characteristics of ray scanning, a scanning image (each frame of image) of each pulse can be processed in real time, an inspected target is extracted from a background through an image segmentation method, on the basis, the appearance of a vehicle head is detected firstly and used as the start of the whole protected area, the frame-by-frame image is detected, whether the whole target is finished or not is judged according to whether the area of the scanned target in each frame of image is suddenly reduced, when the whole is finished, the vehicle protected area is judged to pass through scanning, then rays can be adjusted from low-energy rays or low-dose-rate rays to high-energy rays or high-dose-rate rays, and a cargo compartment behind the vehicle head is scanned and inspected.
Referring to fig. 4, a radiation source control method of an embodiment of the present invention includes the steps of:
after the radiation source starts emitting the first radiation beam to scan the detected object, the detector signal I is acquired by the radiation beam detectoriWhere i is the sequence number of the detector signal, i is 0,1,2, …, n;
detecting whether the current scanning position is the boundary position of the detected object or not through an image recognition algorithm, wherein the boundary position refers to a gap between a first part and a second part of the detected object, and the current scanning position and the s-th detector signal IsCorresponding;
and when the current scanning position is detected to be the boundary position of the detected object, controlling the radiation source to start emitting a second radiation beam.
In practical application scenes, the scheme is applied to the non-stop inspection technology of the vehicle, and the vehicleWhen the front end of the vehicle is detected to reach the preset position (which indicates that the vehicle head is about to enter the scanning position of the radiation source), the radiation source is controlled to emit a first radiation beam, and the first part (the vehicle head passenger carrying area) of the vehicle is scanned and inspected; during scanning, the radiation beam signal I is acquired in real time at a certain frequency in time sequence by using a radiation detectoriWhere i is the sequential number of the detector signals (i ═ 0,1,2, …, n); the current scanning position of the radiation source (corresponding to the s-th detector signal I) is detected by an image recognition algorithms) When the first part and the second part (the loading area behind the vehicle head) are positioned at the boundary position, the radiation source is controlled to emit a second radiation beam, and the loading area behind the vehicle loading area is scanned and checked. Wherein the first radiation beam is a low energy or low dose rate radiation beam complying with a radiation safety standard and the second radiation beam is a high energy or high dose rate radiation beam.
The technical scheme of the embodiment of the invention can be used for scanning and checking the vehicle without stopping the vehicle, the position of the vehicle head is identified by using an image identification algorithm in the scanning process, the vehicle head is scanned and checked by the radiation source with low-energy or low-dosage-rate rays when the vehicle head reaches the scanning position, and when the vehicle head passes through the scanning position and the cargo compartment is about to reach the scanning position, the radiation source is switched to emit high-energy or high-dosage-rate rays to scan and check the cargo in the cargo compartment. The system not only realizes the differential scanning of the whole vehicle, has high security inspection efficiency and low omission factor, but also avoids the trouble of installing special sensor equipment for identifying the position of the vehicle head in the past, reduces the investment cost, is not influenced by environmental factors such as shielding, rain, snow and the like, and has accurate and stable identification.
In the embodiment of the invention, the image recognition algorithm can be realized by different methods, for example, the embodiment of the invention judges whether the protection area (the head of a truck or the whole of a passenger vehicle) of a detected vehicle passes through the scanning area by detecting the integrity of a scanned object through a radiation image, therefore, according to the basic principle of ray scanning, each frame of scanning image of a detector can be processed in real time, an object to be detected is extracted from a background by an image segmentation method, on the basis, the appearance of the head is firstly detected to be used as the start of the whole protection area, the detection is carried out frame by frame through images, whether the whole protection area of the object to be scanned is suddenly reduced in each frame of images is judged to be finished, when the whole is finished, the vehicle protection area is judged to have passed through the scanning, and further, the ray can be adjusted from low energy or low dosage rate to high dosage rate, and scanning and checking the cargo compartment behind the vehicle head.
Fig. 5-7 show the processing flow diagrams of the three image recognition algorithms, which are described in detail below. Generally, the ray sources of such devices are all in a pulse working mode, the acquisition time of the secondary detector corresponds to the pulse time of each ray, and each frame of image of the detector is a ray scanning image of each pulse.
Algorithm one, referring to fig. 5, the steps are as follows:
1) when a vehicle enters a scanning area, a first radiation beam switch is turned on, a radiation source emits a first radiation beam to scan, and an initialization counter Ctr is 0;
2) the linear array detector collects the data of each ray pulse to obtain each column of scanning images IiWhere i is 0,1, …, N is the pulse count;
3) for image IiThe correction image Ic is obtained by correcting the inconsistency and the brightness of each pixeli(ii) a Wherein the inconsistency correction and the brightness correction can be handled in accordance with known correction methods;
4) using threshold value method to image IciPerforming binarization processing to realize image segmentation of background and scanned target to obtain a binarized image IbiThe binarization effect can refer to fig. 1(b), 2(b) and 3(b), which are respectively a binary image of three vehicle types, IbiI.e. the ith column value in the diagram. Fig. 1(a), 2(a) and 3(a) are grayscale images of three vehicle types. The threshold value may be set to be an empty portion (not detected) in the corrected imageObject) by a scaling factor, i.e. μ x ICAirWherein, ICAirFor correcting the image ICiThe gray value of the hollow load part, mu is a proportionality coefficient, 0<μ<1; and will be less than μ x ICAirSet the pixel of (2) to 0, and to be not less than mu ICAirThe pixel of (1) is set to 1. The proportional coefficient can be adjusted according to the recognition effect, and the value range of the proportional coefficient<1, for example, can be set to 0.85.
5) Vertical projection calculation is carried out on the binary image, the projection value is the number of the pixels with non-background value, and the projection value P can be obtainediTypical vehicle image projection values are shown in FIGS. 1-3;
6) calculating the gradient of the projection value, calculating by using a difference method, such as a central difference, in order to improve the detection effect on the slow change of the projection value, the difference window may be set to be larger, such as 10, and the difference formula is as follows:
Gi＝(Pi-1+Pi-2+…+Pi-w/2-Pi-w/2-1-Pi-w/2-2-…-Pi-w)/w，
where w is the window width. The projection values and gradient values for each ray pulse image are shown in fig. 1(c), 2(c) and 3 (c).
7) When Ctr is 0, go to step 8; when Ctr is 1, go to step 9; when Ctr is not equal to 0 and not equal to 1, the step 10) is carried out;
8) when the projection value gradient is larger than a set threshold Thrd _ Gf (G)i>Thrd _ Gf, as shown in fig. 1-3), when a vehicle head is detected, Ctr is set to 1, i.e., Ctr is 1, return to step 2); otherwise, directly returning to the step 2);
9) when the projection value gradient is smaller than a set threshold value Thrd _ Gb (G)i<Thr _ Gb, as shown in fig. 1-3), detecting that the rear edge of the cab starts to fall, setting Ctr to 2, i.e., Ctr ═ 2, and returning to step 2); otherwise, directly returning to the step 2);
10) when the current projection value gradient GiGreater than the previous gradient value Gi-1Sum of threshold Thrd _ IP (G)i>Gi-1+ Thrd _ IP), i.e. the inflection point at which the gradient change is detected, as shown in fig. 1-3, it can be determined that the gap portion has been scanned to the rear of the protection zone, indicating that the protection zone of the vehicle has passed the scan, and the rays can be modified from the first radiation beam to the second radiation beam; otherwise, returning to the step 2.
And secondly, according to a real-time scanned image, by using an image segmentation method, the change of a projection value can be directly measured in a moving window detection mode, so that whether the vehicle protection area passes through the scanning position or not is detected, and a flow chart is shown in fig. 6 and comprises the following steps:
1) when the vehicle enters the scanning area, the first radiation beam switch is turned on, the radiation source emits the first radiation beam to scan, and the maximum projection value P is initializedmax＝0；
2) Step 2) -5) in the same algorithm one as the previous algorithm one);
3) the mean of the projection values in the MaxP window is calculated as follows:
Mi＝(Pi+Pi-1+…+Pi-m+1) M, wherein MiIs the average value of M rows of projection values before the current projection value, M is the width of a MaxP window, M is more than or equal to 1, and when M is equal to 1, M is equal to 1i＝Pi；
The purpose of selecting a window to calculate the mean value of the projection values is to perform signal smoothing processing to reduce interference of fine objects, the width of the window can be appropriately larger, for example, the width is 9, and the window is specifically set according to implementation effects;
4) when M isi>PmaxWhen it is, update PmaxValue, i.e. Pmax＝Mi；
5) Calculating the mean value of the current projection values in the CurrentP window according to the following formula by adopting a similar method in the step 3):
Ci＝(Pi+Pi-1+…+Pi-c+1) C, wherein CiC is the average value of the projection values of C columns before the current projection value, C is the width of a CurrentP window, wherein C is more than or equal to 1, and when C is 1, Ci＝Pi；
The width of the CurrentP window can be appropriately smaller, for example, the width is 3, and the setting is specifically performed according to the required smoothness degree in the implementation process;
6) when C is presenti<PmaxThrd _ P, the portion of the gap that has scanned to the rear of the protected area can be determined, indicating that the protected area of the vehicle has passed the scan, and the rays can be modified from the first radiation beam to the second radiation beam; otherwise, returning to the step 2;
wherein Thrd _ P is a discrimination threshold coefficient, and the value range thereof is less than 1, for example, it can be set to 0.3, and it can be set preferentially according to the implementation effect.
And thirdly, according to the real-time scanning image, in addition to the two modes of utilizing the image statistical characteristics to realize the detection of the protective area of the vehicle, the currently scanned vehicle can be identified by adopting a mode identification technology so as to judge whether the protective area of the vehicle passes through the scanning position, and the third algorithm is the mode of adopting template matching to realize the detection.
The algorithm has the main ideas that: firstly, establishing a template library, wherein protection areas (truck head parts or passenger carrying vehicles) of different types of vehicles correspond to different templates; when the detected vehicle is scanned, the scanned image obtained in real time is taken as a processing object and is matched with each template in the template library; when the matching degree of the scanned image and a certain template meets the corresponding requirement, the identification is completed, and meanwhile, the fact that the protective area of the vehicle passes through the scanning position is determined. The method comprises the following specific steps:
1. building warehouse
Firstly, a common type of vehicle is scanned by a first radiation beam, and after an original scanning image is obtained, preprocessing such as inconsistency correction, brightness correction (see step 3) of the algorithm I) and geometric correction is carried out, wherein the geometric correction can be processed according to the relative speed between the vehicle and a scanning system, image distortion caused by different speeds is eliminated, and the processed image is in the same measurement scale, so that the situation that the current detected image and a template sample cannot be identified due to different proportions can be avoided.
Manually selecting corresponding vehicle protection areas (head parts of freight vehicles or whole passenger vehicles) in the preprocessed images to be used as different templates TnWherein N is 1,2, …, and N is the number of templates.
2. Matching
The matching process is carried out dynamically in real time along with scanning, the obtained images can be matched once in each ray pulse period, several pulse periods can be selected for matching once, and the matching period can be determined on the premise of guaranteeing the timeliness according to the comprehensive measurement of the matching operation speed and the pulse frequency. Before each matching, the template library T is selected according to the width of the current scanning imagen(only the front part of the cargo compartment, including the gap) selecting the templates with the same width to form an effective template set VTmAnd matching is carried out in the effective template group, so that the matching calculation amount can be reduced, and the recognition efficiency is improved. The specific matching process is shown in fig. 7, and the steps are as follows:
1) when the vehicle enters a scanning area, a first radiation beam switch is turned on, and a radiation source emits a first radiation beam to scan;
2) step 2) and step 3) of the first algorithmiCorrecting to obtain a correction signal ICi；
3) Correcting the first I columns of signals I which are acquiredC1～ICiCombining according to the sequence, and carrying out geometric correction according to the moving speed of the vehicle to obtain the vehicle scanning image Isum which is finished at the current momenti；
4) And judging whether the current pulse is subjected to matching processing, and setting r to i% p, wherein i is the serial number of the current pulse, p is the number of set matching interval pulses (matching is performed every p pulses), and the% is remainder operation. When r is equal to 0, turning to step 5) for matching; and when r is not equal to 0, the step 2) is carried out. The P value can be determined according to the comprehensive measurement of the matching operation speed and the pulse frequency, and the P value is required to be as small as possible in order to ensure the real-time property;
5) according to the image IsumiFrom the template library T as followsnSelecting templates with approximate widths to form an effective template set VTm：
V-shaped channelmE-shaped channeln，m＝1,2,3,…,
And is
Wherein m is the number of templates in the effective template group,is an image IsumiThe width of (a) is greater than (b),for image V canalmThe width of (e), channel hrd _ w is a width control threshold, which can be set according to the implementation effect, and is generally a few pixels wide, for example, 5.
6) Image IsumiAnd effective template set VTmEach template in (1) is matched, the degree of matching can be measured by calculating the degree of dissimilarity, and a matching strategy with higher efficiency, such as Sequential Similarity Detection Algorithm (SSDA), can be adopted in implementation, and the formula for calculating the degree of dissimilarity is as follows:
wherein,respectively an image IsumiWidth and height of (d);
7) when the degree of dissimilarity is less than a set threshold Thrd _ S, namely Sm(u)<Canal hrd _ S
When the current scanning image is matched with the template, the protective area (vehicle) of the vehicle is detected
Head or passenger car) has passed through the scanning position and can thus direct radiation from the first radiation beam
Adjusting to a second type of radiation beam, and ending the process; otherwise, returning to the step 2.
The above embodiments describe in detail the use of the invention to control the switching of radiation beams (from a first type of radiation beam for a first partial passenger area examination to a second type of radiation beam for a second partial cargo area examination) and to present three image recognition algorithms. The following embodiments describe controlling the stopping of the radiation beam using the invention, i.e. controlling the stopping of the radiation beam when the vehicle is moving from the scanning position (scan complete).
Referring to fig. 8, the steps of the control method for stopping the radiation beam of the radiation source are as follows:
carrying out radiation scanning inspection on the detected object by adopting a radiation beam emitted by a radiation source;
acquiring radiation beam signals I at a certain frequency in time sequence by using array radiation detectoriWhere i is the sequential number of the detector signal (i ═ 0,1,2, …);
when the feature that the current scanning position corresponds to the air and the detected object is located at the downstream of the scanning position is identified through an image identification algorithm (namely the detected object passes through the scanning), the radiation source is controlled to stop emitting the radiation beam.
In the above embodiments, by means of real-time detection of radiation images, it can be determined whether a protection area (a vehicle head or a passenger vehicle) of a vehicle has been scanned, and the result is used as a control signal for switching radiation beams; furthermore, whether the vehicle has completely passed the scanning can be judged by image recognition as a control signal for closing the ray. The projection value determination method in embodiments 1 and 2 can also be used to determine whether the vehicle completely passes through, and the flow is shown in fig. 8, and the steps are as follows:
1) when the vehicle enters a scanning area, a first type of radiation beam switch is turned on, the radiation source emits a first type of radiation beam to scan, and an idle identification variable Ctr0 is initialized to 0;
2) same as the first algorithm of the embodiment 1, steps 2), 3), 4) and 5)
3) When Ctr0 is equal to 0, go to step 4); when Ctr0 is equal to 1, go to step 5);
4) when the projection value PiGreater than a set threshold Thrd _0P (P)i>Thr — 0P), then Ctr0 is set to 1, i.e., Ctr0 is 1, and the procedure returns to step 2); otherwise, directly returning to the step 2); wherein the threshold Thrd _0P is an average value of projection values of the no-load image (the scanned image without the object), Thrd _0P can be set to 0 if the no-load image has small statistical fluctuation, and the threshold can be adjusted up appropriately if the statistical fluctuation is large.
5) When the projection value PiIs less than or equal to the set threshold Thrd _0P (P)i<Thrd _0P), then the image is restored to be a no-load image, the vehicle has passed the scanning, at this moment, the ray can be closed; otherwise, return to step 2).
The technical solutions of the present invention are described in detail with reference to specific embodiments, which are used to help understanding the idea of the present invention. The derivation and modification made by the person skilled in the art on the basis of the specific embodiment of the present invention also belong to the protection scope of the present invention.
Claims (17)
1. A radiation source control method, comprising:
after the radiation source starts emitting the first radiation beam to scan the detected object, the detector signal I is acquired by the radiation beam detectoriWhere i is the sequence number of the detector signal, i is 0,1,2, …, n;
carrying out image recognition processing on the detector signal through an image recognition algorithm, obtaining a finished vehicle scanning image at the current moment in real time according to the detector signal, and detecting whether the current scanning position is the boundary position of the detected object according to the integrity of the finished vehicle scanning image at the current moment; the method comprises the following steps:
for detector signal IiEach pixel of the image data is corrected to obtain a corrected image ICi；
For the corrected image ICiPerforming image segmentation processing on the detected object and the background to obtain a segmented image IBi；
For the segmented image IBiDetecting boundary position characteristics; the boundary position feature detection includes:
① initializing a maximum projection value P if i is 0max＝0；
② pairs of segmented images IBiPerforming vertical projection calculation to obtain a projection value PiProjection value PiI.e. the segmentation image IBiThe number of pixels of the detected object;
③ calculating the mean M of the M rows of projection values before the current projection valuei＝(Pi+Pi-1+…+Pi-m+1) Where M is not less than 1, and when M is 1, Mi＝Pi(ii) a And, when Mi>PmaxWhen it is, update PmaxValue, i.e. Pmax＝Mi；
④ calculating the mean value C of the C columns of projection values before the current projection valuei＝(Pi+Pi-1+…+Pi-c+1) C, where C is not less than 1, and when C is 1, Ci＝Pi；
⑤ if Ci<PmaxThrd _ P and Thrd _ P are discrimination threshold coefficients, and then the current detector signal I is judgediLocating at the boundary position between the first part and the second part of the detected object, and ending the process, otherwise, jumping to step ②;
when the current scanning position is detected to be the boundary position of the detected object, controlling the radiation source to start emitting a second radiation beam; wherein,
the boundary position refers to a gap between a first part and a second part of the detected object, and the current scanning position and the s-th detector signal IsAnd correspondingly.
2. The radiation source control method according to claim 1, wherein the image segmentation process is a binarization process that uses a threshold value of μ x ICAirWherein, ICAirFor correcting the image ICiThe gray value of the hollow load part, mu is a proportionality coefficient, 0<μ<1; and will be less than μ x ICAirSet the pixel of (2) to 0, and to be not less than mu ICAirThe pixel of (1) is set to 1.
3. The radiation source control method according to claim 1, further characterized in that the image recognition algorithm further comprises performing image recognition processing on the detector signal, obtaining a vehicle scanning image completed at the current time in real time according to the detector signal, and detecting whether the scanning of the detected object is completed according to the integrity of the vehicle scanning image completed at the current time; and when the completion of the scanning of the detected object is detected, controlling the radiation source to stop emitting the radiation beam.
4. The radiation source control method according to claim 3, wherein said performing image recognition processing on the detector signal to detect whether the scanning of the object to be detected has been completed comprises:
for detector signal IiEach pixel of the image data is corrected to obtain a corrected image ICi；
For the corrected image ICiPerforming image segmentation processing on the detected object and the background to obtain a segmented image IBi；
For the segmented image IBiAnd performing characteristic detection of the scanned position corresponding to the air and the detected object located at the downstream of the scanned position.
5. The radiation source control method according to claim 4, wherein the image segmentation process is a binarization process that uses a threshold value of μ x ICAirWherein, ICAirFor correcting the image ICiOf the idling partGray scale value, μ is a scale factor, 0<μ<1; and will be less than μ x ICAirSet the pixel of (2) to 0, and make the pixel be greater than or equal to mu ICAirThe pixel of (1) is set to 1.
6. The radiation source control method of claim 5, wherein the detecting of the characteristic that the scanning position corresponds to air and the object to be detected is located downstream of the scanning position comprises:
① if i is 0, initialize counter Ctr0 is 0;
② pairs of segmented images IBiPerforming vertical projection calculation to obtain a projection value PiProjection value PiI.e. the segmentation image IBiThe number of pixels of the detected object;
③ if Crt0 is 0 and the projected value PiIf the threshold value Thrd _0P is larger than the preset threshold value thr _0P, the detected object is judged to be scanned, Ctr0 is set to be 1, and then the step ② is returned;
④ if Ctr0 is 0 and the projected value PiIf the value is less than or equal to the predetermined threshold Thrd _0P, it is determined that the detected object is not scanned, and the step ② is returned;
⑤ if Ctr0 is 1 and the projected value P isiIf the value is less than or equal to the preset threshold Thrd _0P, the current scanning position is judged to correspond to the air, and the detected object is positioned at the downstream of the scanning position, and the process is ended.
7. The radiation source control method as set forth in claim 6, wherein the predetermined threshold Thrd _0P is an average value of projection values of the idle image.
8. The radiation source control method defined in any one of claims 1-7, wherein the object to be detected is a vehicle, the first portion is a passenger area of the vehicle, and the second portion is a cargo area of the vehicle.
9. The radiation source control method as set forth in claim 1, further,the image recognition algorithm further comprises establishing a vehicle template library TnAnd scanning the finished vehicle by the image IsumiAnd matching with the vehicle template, wherein n is the number of the templates.
10. The radiation source control method defined in claim 9, wherein the vehicle template library TnEach template of (a) contains at least the passenger carrying area and the demarcation location.
11. The radiation source control method defined in claim 9, wherein the scan image IsumiObtained by the following steps:
for detector signal IiEach pixel of the image sensor is subjected to correction processing to obtain a correction signal ICi；
Correcting the first I columns of signals I which are acquiredC1～ICiCombining according to the sequence, and carrying out geometric correction according to the moving speed of the vehicle to obtain the vehicle scanning image Isum which is finished at the current momenti。
12. The radiation source control method defined in any one of claims 9-11, wherein the matching comprises:
from a library of templates TnMiddle selection valid template VTmM is the number of effective templates, VTmThe image width of each template in (1) and the scanned image IMGiThe difference of the widths of the first and second electrodes is less than or equal to a preset difference value;
will scan the image IsumiAnd valid template VTmEach template in (1) is matched one by one, if the current scanning image IsumiAnd valid template VTmThe kth template VT ofkIs less than the set threshold Thrd _ S, the current scanned image Isum is considerediAnd the kth template VTkAnd if the scanning position is matched with the boundary position of the vehicle, judging that the current scanning position is located at the boundary position of the vehicle.
13. A quick pass security check system, comprising:
at least one radiation source for emitting at least two radiation beams;
radiation beam detector for acquiring a plurality of detector signals IiWhere i is the sequence number of the detector signal, i is 0,1,2, …, n;
the image recognition algorithm module is used for carrying out image recognition processing on the detector signal, obtaining a vehicle scanning image finished at the current moment in real time according to the detector signal, and detecting whether the current scanning position is the boundary position of the detected object according to the integrity of the vehicle scanning image finished at the current moment; the method comprises the following steps:
for detector signal IiEach pixel of the image data is corrected to obtain a corrected image ICi；
For the corrected image ICiPerforming image segmentation processing on the detected object and the background to obtain a segmented image IBi；
For the segmented image IBiDetecting boundary position characteristics; the boundary position feature detection includes:
① initializing a maximum projection value P if i is 0max＝0；
② pairs of segmented images IBiPerforming vertical projection calculation to obtain a projection value PiProjection value PiI.e. the segmentation image IBiThe number of pixels of the detected object;
③ calculating the mean M of the M rows of projection values before the current projection valuei＝(Pi+Pi-1+…+Pi-m+1) Where M is not less than 1, and when M is 1, Mi＝Pi(ii) a And, when Mi>PmaxWhen it is, update PmaxValue, i.e. Pmax＝Mi；
④ calculating the mean value C of the C columns of projection values before the current projection valuei＝(Pi+Pi-1+…+Pi-c+1) C, where C is not less than 1, and when C is 1, Ci＝Pi；
⑤ if Ci<PmaxThrd _ P, Thrd _ P is the discrimination threshold systemCounting, then judging the current detector signal IiLocating at the boundary position between the first part and the second part of the detected object, and ending the process, otherwise, jumping to step ②;
the radiation source control module is used for controlling the radiation source to start emitting the appointed radiation beam when the current scanning position is detected to be the boundary position of the detected object; wherein,
the boundary position refers to a gap between a first part and a second part of the detected object, and the current scanning position and the s-th detector signal IsAnd correspondingly.
14. The fast pass security inspection system of claim 13, further characterized in that the image recognition algorithm module is further configured to perform image recognition processing on the detector signal, obtain a vehicle scan image completed at the current time in real time according to the detector signal, and detect whether the scanning of the object to be inspected has been completed according to the vehicle scan image completed at the current time; when the completion of the scanning of the detected object is detected, the radiation source control module controls the radiation source to stop emitting the radiation beam.
15. The system of claim 13, wherein the object is a vehicle, the first portion is a passenger area of the vehicle, and the second portion is a cargo area of the vehicle.
16. The quick pass security check system of claim 15, further wherein the image recognition algorithm module is further configured to create a vehicle template library TnAnd scanning the finished vehicle by the image IsumiAnd matching with the vehicle template, wherein n is the number of the templates.
17. The quick pass security system of claim 16, wherein the vehicle template library TnEach template of (a) comprising at least said passenger carrying area andthe demarcation location.
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| CN108897055B (en) | 2020-02-21 |
| SA518392204B1 (en) | 2022-04-17 |
| CN105652332A (en) | 2016-06-08 |
| CN105652332B (en) | 2019-02-12 |
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