CN108957514B - A kind of nuclear radiation detection method - Google Patents
A kind of nuclear radiation detection method Download PDFInfo
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- CN108957514B CN108957514B CN201810488263.XA CN201810488263A CN108957514B CN 108957514 B CN108957514 B CN 108957514B CN 201810488263 A CN201810488263 A CN 201810488263A CN 108957514 B CN108957514 B CN 108957514B
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
Abstract
The present invention provides a kind of nuclear radiation detection method, and long-term accurately nuclear radiation monitoring can be carried out to the dynamic environment on video recording equipment periphery and nuclear radiation dosage rate is estimated.The described method includes: under the conditions of obtaining without shading dynamic scene, the video recorded in the environment for needing nuclear radiation monitoring using CCD/CMOS as the video recording equipment of sensor；The video of recording is subjected to sub-frame processing and obtains series of frame images, obtains the difference image of each frame image frame adjacent thereto；According to the moving object region in obtained difference image detection difference image, and remove the moving object region in difference image；Whether contain radiation speck according to the difference image detection frame image in removal moving object region；The case where accounting for the ratio of the totalframes of the video of recording according to the number of the frame image containing radiation speck and deducting moving object area, the radiation dose rate of nuclear radiation environment where obtaining video recording equipment.The present invention is operated suitable for nuclear radiation detection.
Description
Technical field
The present invention relates to nuclear radiation detection fields, particularly relate to a kind of nuclear radiation detection method.
Background technique
Nuclear radiation detection field experienced the process from counting, to detecting nuclear radiation energy spectrum, showing to current image, mesh
Preceding most popular nuclear radiation detection method is usually with gas, and scintillator and semiconductor material are medium.And it is based on
The above medium has been developed that all kinds of gas nuclear radiation detectors, scintillator nuclear radiation detector and semiconductor nuclear radiation detection
Device.But gas nuclear radiation detector dead time long unsuitable high count rate occasion, and scintillator nuclear radiation detector price is high
It is expensive to be difficult to promote.Semiconductor imaging tools by taking CCD/CMOS as an example start to play a role in nuclear radiation field, and CCD/CMOS is passed
Sensor is very universal in fields such as camera shooting, imaging and measurements, the daily image capture device with camera such as mobile phone, mutually mechanical, electrical
Brain and monitoring camera is first-class mostly uses CCD/CMOS sensor as light sensing original part.Nuclear radiation detection based on CCD/CMOS
Method can sufficiently effective feature high using cmos sensor popularity rate, cheap.
It has had tried to use CCD/CMOS sensor as sensing element to detect nuclear radiation at present；One of which side
Method is, in the case where known gamma-ray incident direction, the CCD/CMOS sensor that smart phone can be used detects ring
Gamma-ray spectral information in border.In addition, being commonly often made with screening using CCD/CMOS sensor detection method of radiating
Light device blocks the visible light into sensor, under the influence of excluding visible light, obtains gamma-rays in CCD/CMOS sensor
Response image, then whether containing nuclear radiation in environment is judged by algorithm to image, but this method is needed using shading device
Sensor is blocked, here it is causing the video recording equipment based on CCD/CMOS sensor to lose original function, causes resource
Waste, be unfavorable for the universal of this method.In addition, somebody proposes one kind under static without motion object scene based on CCD/
The nuclear radiation detection method of cmos sensor, due to environmentally defined without dynamic object, the very harsh conditions such as illumination is stablized,
Nuclear radiation detection can not be carried out to general daily life scene, so be difficult to popularize.
Tradition is set by the camera shooting of photosensitive element of CCD/CMOS based on the nuclear radiation detection method of CCD/CMOS not wasting
Under conditions of its standby original camera function, the nuclear radiation for detecting surrounding enviroment has harsh want to the recording environment of radiation source
It asks, can not be effectively applied in everyday scenes.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of nuclear radiation detection methods, to solve present in the prior art
There is harsh requirement to the recording environment of radiation source when detecting the nuclear radiation of surrounding enviroment, daily field can not be effectively applied to
The problems in scape.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of nuclear radiation detection method, comprising:
Under the conditions of obtaining without shading dynamic scene, nuclear radiation monitoring is being needed by the video recording equipment of sensor of CCD/CMOS
The video recorded in environment；
The video of recording is subjected to sub-frame processing and obtains series of frame images, obtains the difference of each frame image frame adjacent thereto
Partial image；
According to the moving object region in obtained difference image detection difference image, and remove the movement in difference image
Object area；
Whether contain radiation speck according to the difference image detection frame image in removal moving object region；
The ratio of the totalframes of the video of recording is accounted for according to the number of the frame image containing radiation speck and deducts movement
The case where object area, the radiation dose rate of nuclear radiation environment where obtaining video recording equipment.
Further, it under the conditions of obtaining without shading dynamic scene, is being needed by the video recording equipment of sensor of CCD/CMOS
Before the video recorded in the environment of nuclear radiation monitoring, the method also includes:
Under the conditions of no shading dynamic scene, utilizing is needing nuclear radiation monitoring by the video recording equipment of sensor of CCD/CMOS
Environment in recorded video, and by the video of recording be passed to data processing centre, so that the data processing centre executes acquisition
Under the conditions of shading dynamic scene, recorded in the environment for needing nuclear radiation monitoring using CCD/CMOS as the video recording equipment of sensor
The step of video.
Further, the video recording equipment include: using CCD/CMOS be the road monitoring of sensor, IP Camera or
One of person's mobile phone camera is a variety of.
Further, it includes: PC machine, mobile terminal or cloud computing that the video recording equipment, which includes: the data processing centre,
One of platform is a variety of.
Further, the difference image for obtaining each frame image frame adjacent thereto includes:
After carrying out image gray processing and smooth pretreatment to each frame image, the difference of each frame image frame adjacent thereto is obtained
Partial image；
Wherein, smooth preprocess method includes: dimensional Gaussian convolution kernel filtering method.
Further, the video by recording carry out sub-frame processing and obtain series of frame images include:
The video of recording is subjected to sub-frame processing and obtains series of frame images, and stores the relevant parameter of video；
Wherein, the relevant parameter of the video include: video duration length, video code model, video totalframes,
Video record time point, the video time for exposure, video frame rate and video record location longitude and latitude.
Further, the difference image of frame image frame adjacent thereto includes: the forward difference image of current frame image with after
To difference image；
The moving object region in difference image detection difference image that the basis obtains, and remove in difference image
Moving object region includes:
According to the forward difference image and backward difference image of obtained each frame image, the fortune based on background difference is utilized
Animal body detection method, frame differential method, the motion estimation algorithm based on optical flow field, the motion estimation algorithm based on Block- matching, inspection
Moving object region in error of measurement partial image, and the moving object region in difference image is removed, obtain two new difference diagrams
Picture.
Further, after obtaining two new difference images, the method also includes:
Edge noise is removed using filtering method to obtained new difference image.
Further, whether the difference image detection frame image according to removal moving object region contains radiation speck
Include:
Obtained new forward difference image is synthesized into a frame image with backward difference image, using thresholding method with
Judge whether the frame image of synthesis contains radiation speck.
Further, the number for the frame image that the basis contains radiation speck accounts for the ratio of the totalframes of the video of recording
And the case where deducting moving object area, the radiation dose rate of nuclear radiation environment includes: where obtaining video recording equipment
The ratio of the totalframes of the video of recording is accounted for according to the number of the frame image containing radiation speck and deducts movement
The case where object area, pass through formula:The nuclear radiation agent of environment where determining video recording equipment
Dose rate；
Wherein, the nuclear radiation dosage rate of environment where R indicates video recording equipment, β is carried out with nuclear radiation dosage measurement instrument
Control experiment obtains the proportionality coefficient between nuclear radiation dose value and video image calculated value, and N is the video in the unit time
Totalframes, s0It is the sum of all pixels of every frame image, siIt is remaining sum of all pixels after the i-th frame image deduction moving object, δiFor spoke
Penetrate event identifier.
The advantageous effects of the above technical solutions of the present invention are as follows:
In above scheme, under the conditions of obtaining without shading dynamic scene, needed by the video recording equipment of sensor of CCD/CMOS
The video recorded in the environment of nuclear radiation monitoring；The video of recording is subjected to sub-frame processing and obtains series of frame images, is obtained every
The difference image of one frame image frame adjacent thereto；The moving object region in difference image is detected according to obtained difference image,
And remove the moving object region in difference image；Whether contained according to the difference image detection frame image in removal moving object region
There is radiation speck；The ratio of the totalframes of the video of recording is accounted for according to the number of the frame image containing radiation speck and deducts fortune
The case where body area, the radiation dose rate of nuclear radiation environment where obtaining video recording equipment；In such manner, it is possible in no shading dynamic
Under scene condition, the original camera function of CCD/CMOS video recording equipment is kept, the dynamic environment on video recording equipment periphery is grown
Phase accurate nuclear radiation monitoring and nuclear radiation dosage rate are estimated, and monitoring cost is low.
Detailed description of the invention
Fig. 1 is the flow diagram of nuclear radiation detection method provided in an embodiment of the present invention；
Fig. 2 is the knot of CMOS camera and data processing centre that nuclear radiation detection method provided in an embodiment of the present invention uses
Structure schematic diagram；
Fig. 3 is the detailed process schematic diagram of nuclear radiation detection method provided in an embodiment of the present invention；
Fig. 4 is the system noise schematic diagram of sensor provided in an embodiment of the present invention；
Fig. 5 is grey for the three-dimensional of speck feature in difference image under the conditions of not shading dynamic scene provided in an embodiment of the present invention
Angle value schematic diagram；
Fig. 6 (a) is the effect diagram before moving object provided in an embodiment of the present invention removes；
Fig. 6 (b) is moving object removal provided in an embodiment of the present invention and object boundary removal effect schematic diagram；
Fig. 7 (a) is the ash that two difference images provided in an embodiment of the present invention by current non-radiative frame ultimately generate
Degree figure V schematic diagram；
Fig. 7 (b) is the gray scale that two difference images provided in an embodiment of the present invention by current radiation frame ultimately generate
Scheme V schematic diagram；
Fig. 8 is the ash that the frame image of the radiationless situation video of not shading dynamic scene provided in an embodiment of the present invention generates
The η Distribution value histogram of degree figure V；
Fig. 9 (a) is the frame figure of video under 22.0 μ Svh radiation intensity of not shading dynamic scene provided in an embodiment of the present invention
As the η Distribution value histogram of the grayscale image V generated；
Fig. 9 (b) is the frame figure of video under 38.6 μ Svh radiation intensity of not shading dynamic scene provided in an embodiment of the present invention
As the η Distribution value histogram of the grayscale image V generated；
Fig. 9 (c) is the frame figure of video under 69.1 μ Svh radiation intensity of not shading dynamic scene provided in an embodiment of the present invention
As the η Distribution value histogram of the grayscale image V generated；
Fig. 9 (d) is the frame figure of video under 183.7 μ Svh radiation intensity of not shading dynamic scene provided in an embodiment of the present invention
As the η Distribution value histogram of the grayscale image V generated；
Fig. 9 (e) is the frame figure of video under 271.6 μ Svh radiation intensity of not shading dynamic scene provided in an embodiment of the present invention
As the η Distribution value histogram of the grayscale image V generated；
Fig. 9 (f) is the frame figure of video under 614.9 μ Svh radiation intensity of not shading dynamic scene provided in an embodiment of the present invention
As the η Distribution value histogram of the grayscale image V generated.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
There is harsh want to the recording environment of radiation source when the present invention is for the existing nuclear radiation for detecting surrounding enviroment
It asks, the problems in everyday scenes can not be effectively applied to, a kind of nuclear radiation detection method is provided.
As shown in Figure 1, nuclear radiation detection method provided in an embodiment of the present invention, comprising:
S101 is needing nuclear radiation by the video recording equipment of sensor of CCD/CMOS under the conditions of obtaining without shading dynamic scene
The video recorded in the environment of monitoring；
The video of recording is carried out sub-frame processing and obtains series of frame images, it is adjacent thereto to obtain each frame image by S102
The difference image of frame；
S103 according to the moving object region in obtained difference image detection difference image, and is removed in difference image
Moving object region；
Whether S104 contains radiation speck according to the difference image detection frame image in removal moving object region；
S105 accounts for the ratio and deduction of the totalframes of the video of recording according to the number of the frame image containing radiation speck
The case where moving object area, the radiation dose rate of nuclear radiation environment where obtaining video recording equipment.
Nuclear radiation detection method described in the embodiment of the present invention, under the conditions of obtaining without shading dynamic scene, with CCD/CMOS
The video recorded in the environment for needing nuclear radiation monitoring for the video recording equipment of sensor；The video of recording is carried out sub-frame processing to obtain
To series of frame images, the difference image of each frame image frame adjacent thereto is obtained；Difference is detected according to obtained difference image
Moving object region in image, and remove the moving object region in difference image；According to the difference in removal moving object region
Whether partial image detection frame image contains radiation speck；The video of recording is accounted for according to the number of the frame image containing radiation speck
The case where ratio and deduction moving object area of totalframes, the dose of radiation of nuclear radiation environment where obtaining video recording equipment
Rate；In such manner, it is possible to the original camera function of CCD/CMOS video recording equipment be kept, to video recording under the conditions of no shading dynamic scene
The dynamic environment on equipment periphery carries out long-term accurately nuclear radiation monitoring and nuclear radiation dosage rate is estimated, and monitoring cost is low.
In the specific embodiment of aforementioned nuclear radiation detection method, further, obtaining without shading dynamic scene item
Under part, before the video recorded in the environment for needing nuclear radiation monitoring using CCD/CMOS as the video recording equipment of sensor, the side
Method further include:
Under the conditions of no shading dynamic scene, utilizing is needing nuclear radiation monitoring by the video recording equipment of sensor of CCD/CMOS
Environment in recorded video, and by the video of recording be passed to data processing centre, so that the data processing centre executes acquisition
Under the conditions of shading dynamic scene, recorded in the environment for needing nuclear radiation monitoring using CCD/CMOS as the video recording equipment of sensor
The step of video.
In order to realize nuclear radiation detection method described in the present embodiment, need using the record for comprising CCD/CMOS being sensor
As the data processing centre of equipment and rear end；In this way, the video that video recording equipment records certain length can be used, and by recording
Video is passed to the data processing centre of rear end, to carry out nuclear radiation monitoring and nuclear radiation dosage in the data processing centre of rear end
Rate estimation.
In the specific embodiment of aforementioned nuclear radiation detection method, further, the video recording equipment includes: to use
CCD/CMOS is one of road monitoring, IP Camera or mobile phone camera of sensor or a variety of.
In the specific embodiment of aforementioned nuclear radiation detection method, further, the video recording equipment includes: the number
It according to processing center include: one of PC machine, mobile terminal or cloud computing platform or a variety of.
In the present embodiment, the mobile terminal includes but is not limited to: smart phone, plate, laptop.
It is further, described to obtain each frame image and its in the specific embodiment of aforementioned nuclear radiation detection method
The difference image of consecutive frame includes:
After carrying out image gray processing and smooth pretreatment to each frame image, the difference of each frame image frame adjacent thereto is obtained
Partial image；
Wherein, smooth preprocess method includes: dimensional Gaussian convolution kernel filtering method.
It is further, described to be divided the video of recording in the specific embodiment of aforementioned nuclear radiation detection method
Frame handles to obtain series of frame images
The video of recording is subjected to sub-frame processing and obtains series of frame images, and stores the relevant parameter of video；
Wherein, the relevant parameter of the video include: video duration length, video code model, video totalframes,
Video record time point, the video time for exposure, video frame rate and video record location longitude and latitude.
In the specific embodiment of aforementioned nuclear radiation detection method, further, the difference of frame image frame adjacent thereto
Image includes: the forward difference image and backward difference image of current frame image；
The moving object region in difference image detection difference image that the basis obtains, and remove in difference image
Moving object region includes:
According to the forward difference image and backward difference image of obtained each frame image, the fortune based on background difference is utilized
Animal body detection method, frame differential method, the motion estimation algorithm based on optical flow field, the motion estimation algorithm based on Block- matching, inspection
Moving object region in error of measurement partial image, and the moving object region in difference image is removed, obtain two new difference diagrams
Picture.
In the specific embodiment of aforementioned nuclear radiation detection method, further, two new difference images are being obtained
Later, the method also includes:
Edge noise is removed using filtering method to obtained new difference image.
It is further, described according to removal moving object area in the specific embodiment of aforementioned nuclear radiation detection method
Whether the difference image detection frame image in domain contains radiation speck
Obtained new forward difference image is synthesized into a frame image with backward difference image, using thresholding method with
Judge whether the frame image of synthesis contains radiation speck.
In the specific embodiment of aforementioned nuclear radiation detection method, further, the basis contains radiation speck
The case where number of frame image accounts for the ratio of the totalframes of the video of recording and deducts moving object area, obtains video recording equipment
The radiation dose rate of place nuclear radiation environment includes:
The ratio of the totalframes of the video of recording is accounted for according to the number of the frame image containing radiation speck and deducts movement
The case where object area, pass through formula:The nuclear radiation agent of environment where determining video recording equipment
Dose rate；
Wherein, the nuclear radiation dosage rate of environment where R indicates video recording equipment, β is carried out with nuclear radiation dosage measurement instrument
Control experiment obtains the proportionality coefficient between nuclear radiation dose value and video image calculated value, and N is the video in the unit time
Totalframes, s0It is the sum of all pixels of every frame image, siIt is remaining sum of all pixels after the i-th frame image deduction moving object, δiFor spoke
Penetrate event identifier.
The nuclear radiation detection method for a better understanding of the present invention, as shown in Fig. 2, in the present embodiment, with CMOS
It is described in detail for video recording equipment nuclear radiation detection method described in the embodiment of the present invention of sensor, the method is specific
May include:
A11 is used and is recorded certain length in the environment for needing nuclear radiation monitoring by the video recording equipment of sensor of CMOS
Video, and by the video of recording be passed to rear end data processing centre.
As shown in figure 3, installing and using CMOS phase in the doubtful environment containing nuclear radiation source or setting nuclear radiation source
Machine uses from the video that CMOS is recorded in the present embodiment and is syncopated as the video that length is 1000 frames, and by data
It is passed to Back end data processing center as shown in Figure 2.
Specifically: for CMOS camera used in Fig. 2, can be dedicated CMOS camera, be also possible to make with CMOS
For the mobile phone of photosensitive element, monitor etc..For Back end data processing center, PC machine including but not limited to shown in Fig. 2, notes
This computer, Cloud Server and smart phone.For resulting video frame number length, 1000 frames are not limited to, according to environment
Difference different frame numbers can be used.
In the present embodiment, labled radiopharmaceuticals can be used99TcmLiquid is as nuclear radiation source.
Monitoring gained video is carried out sub-frame processing and obtains a series of images, and retains the relevant parameter of video by A12.Such as
Shown in Fig. 3, the image after video framing is saved according to the time by serial number, and save the relevant parameter of original video.
Specifically: as shown in figure 3, resulting 1000 frame image is carried out mark preservation by serial number 1 to 1000, and retaining original
The relevant parameter of video, relevant parameter information includes but is not limited to: video duration length, video code model, video
Totalframes, video record time point, the longitude and latitude of video time for exposure, video frame rate and video record location.
A13 obtains each frame image and its phase after carrying out image gray processing and image smoothing pretreatment to each frame image
The difference image of adjacent frame.As shown in figure 3, sequentially carrying out image gray processing and image smoothing pretreatment to resulting each frame image
Afterwards, the forward difference image and backward difference image of present frame are obtained.
Since CMOS camera generally uses traditional three-chip type imaging method, i.e., the object of recording is used tri- color of RGB respectively
It is encoded.And radiating particle is different from monochromatic light, radiation example is beaten on the image sensor, and particle on sensor can be caused to hit
The variation of area charge is played, tri- color value of RGB for generating radiation speck has no obvious specificity, and speck is on color and in environment
Shine or reflective white point is similar.Therefore the extraction that radiation information will can be carried out again after video image progress gray processing processing, from
And data volume is reduced, improve the speed of data processing.As shown in figure 4, due to the product quality reasons of imaging sensor sheet, or
It will appear some bad points in long-term use process, the output of bad point will not make corresponding change according to the variation of intensity of illumination
Change, the constant point of a gray value may be reflected as on the video images, or be lasting bright spot, or be lasting blackening.This
The gray value of a little bad points is relatively stable, and bad point is often isolated extraordinary image vegetarian refreshments, has no relevance with other pixels.Such as figure
Shown in 5, under the conditions of not shading dynamic scene in difference image speck feature Three-Dimensional Gray value schematic diagram, system noise and radiation
The gray value that speck generates on the image has biggish difference, therefore can be used includes but is not limited to dimensional Gaussian convolution kernel filter method
System noise is removed etc. smooth preprocess method.
A14 detects the moving object region in difference image according to gained difference image, removes the movement in difference image
Object area, as shown in Figure 3.Moving object therein is identified according to resulting two difference images, removes the figure of moving object
As region, two new difference images are obtained.
Specifically: when detecting the moving object of difference image, removing and potentially radiate speck in image to moving object
The influence that physical examination is surveyed, it is smaller due to potentially radiating gray-value variation region caused by speck, opening for fixation structure can be used
Operation handles image, excludes the interference of radiation.The size of the structural body of operating process selection is opened to whether capable of effectively going
Except the radiation speck in difference image is most important.Since the photosensitive target piece of different cameras is different, radiating particle is formed by
Speck size also all differences, therefore the size of structural body will be adjusted according to different types of cmos sensor type.It is going
After radiation interference, the moving object in the difference image can be detected in the following way: based on background difference
Moving object segmentation method, frame differential method, the motion estimation algorithm based on optical flow field, estimation based on Block- matching calculate
Method, and the moving object region in difference image is removed, two new difference images are obtained, obtained new difference image is made
Edge noise is removed with filtering method, as shown in Fig. 6 (a), 6 (b).
In the present embodiment, obtained new forward difference image and backward difference image can be respectively labeled as D1, D2.
A15 calculates whether frame image contains radiation speck according to the difference image in removal moving object region, as shown in figure 3, will
To two new difference images synthesize one to obtain better robustness, and should using radiation speck detection algorithm detection
Whether image contains radiation speck.
Specifically: for each frame, by the difference image D1 and D2 after removal moving object, using following formula to image
Each of pixel calculate, synthesize a new image:
V=min (D1, D2)
Shown in gained image such as Fig. 7 (a), (b), from Fig. 7 (a), (b) it is found that non-radiative frame generation V figure maximum ash
The maximum gray scale for the V figure that degree is generated with radiation frame has apparent difference, so the maximum gradation value that can be used in V (is denoted as
η, wherein η=max (V)) it as frame to be screened whether is the gray feature value for radiating frame.More specifically, one is first set
Threshold value T, when the η value in the V figure that present frame generates is greater than T, then it is assumed that present frame is radiation frame, is otherwise non-radiative frame.Threshold
The setting of value is different according to the difference of environment where CMOS camera and camera.Such as: Fig. 8 is certain CMOS camera in radiationless source
The η distribution map for the V figure that 1000 frame images generate respectively in video under certain scene.Gained distribution is counted, after can must handling
It is 0.2 ‰ that probability of the characteristics of image gray value η greater than 10, which has been less than, it can be considered that pole in video image of the η value greater than 10
Maximum probability speck containing radiation, i.e., be set as 10 for threshold value T.Fig. 9 (a)-(f) is video under not shading dynamic scene difference radiation intensity
Frame image generate grayscale image V η Distribution value histogram.
A16 accounts for the ratio and deduction of the totalframes of the video of recording according to the number of the frame image containing radiation speck
The case where moving object area, show that video recording equipment place needs the dose of radiation of radioactive substance in the environment of nuclear radiation monitoring
Rate.
In the present embodiment, the Poisson distribution characteristic based on nuclear radiation event, and consider the moving object area deducted
Situation can pass through formulaCalculating video recording equipment place needs to put in the environment of nuclear radiation monitoring
The radiation dose rate R of penetrating property substance；
Wherein, when being determined as has radiation event, radiation event identifies δi=1, no person, radiation event identifies δi=0.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of nuclear radiation detection method characterized by comprising
It is the video recording equipment of sensor in the environment for needing nuclear radiation monitoring using CCD/CMOS under the conditions of obtaining without shading dynamic scene
The video of middle recording；
The video of recording is subjected to sub-frame processing and obtains series of frame images, obtains the difference diagram of each frame image frame adjacent thereto
Picture；
According to the moving object region in obtained difference image detection difference image, and remove the moving object in difference image
Region；
Whether contain radiation speck according to the difference image detection frame image in removal moving object region；
The ratio of the totalframes of the video of recording is accounted for according to the number of the frame image containing radiation speck and deducts moving object
The case where area, the radiation dose rate of nuclear radiation environment where obtaining video recording equipment；
Wherein, the number for the frame image that the basis contains radiation speck accounts for the ratio and deduction of the totalframes of the video of recording
The case where moving object area, the radiation dose rate of nuclear radiation environment includes: where obtaining video recording equipment
The ratio of the totalframes of the video of recording is accounted for according to the number of the frame image containing radiation speck and deducts moving object
The case where area, passes through formula:The nuclear radiation dosage rate of environment where determining video recording equipment；
Wherein, the nuclear radiation dosage rate of environment where R indicates video recording equipment, β is compareed with nuclear radiation dosage measurement instrument
Experiment obtains the proportionality coefficient between nuclear radiation dosage rate values and video image calculated value, and N is the total of the video in the unit time
Frame number, s0It is the sum of all pixels of every frame image, siIt is remaining sum of all pixels after the i-th frame image deduction moving object, δiFor radiation
Event identifier；
Wherein, when being determined as has radiation event, radiation event identifies δi=1, no person, radiation event identifies δi=0.
2. nuclear radiation detection method according to claim 1, which is characterized in that obtaining without shading dynamic scene condition
Under, before the video recorded in the environment for needing nuclear radiation monitoring using CCD/CMOS as the video recording equipment of sensor, the method
Further include:
Under the conditions of no shading dynamic scene, utilizing using CCD/CMOS is the video recording equipment of sensor in the ring for needing nuclear radiation monitoring
Recorded video in border, and the video of recording is passed to data processing centre, it obtains so that the data processing centre executes without screening
Under photokinesis scene condition, the video recorded in the environment for needing nuclear radiation monitoring using CCD/CMOS as the video recording equipment of sensor
The step of.
3. nuclear radiation detection method according to claim 2, which is characterized in that the video recording equipment includes: using CCD/
CMOS is one of road monitoring, IP Camera or mobile phone camera of sensor or a variety of.
4. nuclear radiation detection method according to claim 2, which is characterized in that the data processing centre include: PC machine,
One of mobile terminal or cloud computing platform are a variety of.
5. nuclear radiation detection method according to claim 1, which is characterized in that each frame image of acquisition is adjacent thereto
The difference image of frame includes:
After carrying out image gray processing and smooth pretreatment to each frame image, the difference diagram of each frame image frame adjacent thereto is obtained
Picture；
Wherein, smooth preprocess method includes: dimensional Gaussian convolution kernel filtering method.
6. nuclear radiation detection method according to claim 1, which is characterized in that the video by recording carries out at framing
Reason obtains series of frame images and includes:
The video of recording is subjected to sub-frame processing and obtains series of frame images, and stores the relevant parameter of video；
Wherein, the relevant parameter of the video includes: video duration length, video code model, video totalframes, video
Recording time point, video time for exposure, video frame rate and the longitude and latitude in video record location.
7. nuclear radiation detection method according to claim 1, which is characterized in that the difference image of frame image frame adjacent thereto
It include: the forward difference image and backward difference image of current frame image；
The moving object region in difference image detection difference image that the basis obtains, and remove the movement in difference image
Object area includes:
According to the forward difference image and backward difference image of obtained each frame image, the moving object based on background difference is utilized
Body detection method, frame differential method, the motion estimation algorithm based on optical flow field or the motion estimation algorithm based on Block- matching, it is poor to detect
Moving object region in partial image, and the moving object region in difference image is removed, obtain two new difference images.
8. nuclear radiation detection method according to claim 7, which is characterized in that obtain two new difference images it
Afterwards, the method also includes:
Edge noise is removed using filtering method to obtained new difference image.
9. nuclear radiation detection method according to claim 7, which is characterized in that described according to removal moving object region
Whether difference image detection frame image contains radiation speck
Obtained new forward difference image is synthesized into a frame image with backward difference image, using thresholding method to judge
Whether the frame image of synthesis contains radiation speck.
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| CN109793509B (en) * | 2019-03-15 | 2020-12-29 | 北京科技大学 | Nuclear radiation detection and heart rate measurement method and device |
| CN110261887B (en) * | 2019-06-27 | 2023-03-21 | 南华大学 | Method, device and medium for discriminating radiation ray types |
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| CN113468985B (en) * | 2021-06-16 | 2023-09-05 | 北京科技大学 | Locking method for suspicious radiation source carrying personnel |
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