CN102230975A - Transmission image deformation correction method for channel type X-ray safety inspection equipment - Google Patents
Transmission image deformation correction method for channel type X-ray safety inspection equipment Download PDFInfo
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- CN102230975A CN102230975A CN2011100878826A CN201110087882A CN102230975A CN 102230975 A CN102230975 A CN 102230975A CN 2011100878826 A CN2011100878826 A CN 2011100878826A CN 201110087882 A CN201110087882 A CN 201110087882A CN 102230975 A CN102230975 A CN 102230975A
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Abstract
The invention relates to a transmission image deformation correction method for channel type X-ray safety inspection equipment. The transmission image deformation correction method comprises the following steps of: 1) calculating projection proportionality factors of detectors: calculating the projection proportionality factors of every detector board and all the detectors on the board according to a position relation among an X-ray source, an object channel plane and the detector board in the channel type X-ray safety inspection equipment; 2) calculating deformation correction factors of the detectors: calculating a deformation correction factor of each detector; and 3) performing interpolation amplification processing on each pixel point of the transmission image according to the difference of the deformation correction factors so as to acquire an image of a deformation correction result. The transmission image deformation correction method has the advantages that: on the basis of the conventional channel type X-ray safety inspection equipment and on the premise of not increasing any hardware cost, the deformation correction of the transmission image is realized only by the image deformation correction method, and the omitted judgment and wrong judgment of a safety inspector can be reduced.
Description
Technical field
The present invention relates to X ray security inspection applications field, relate in particular to a kind of channel-type X ray safety inspection equipment transmission image deformation bearing calibration.
Background technology
In channel-type X ray safety inspection equipment, because the relation of the position between x-ray source and object channel plane, the detecting plate three, distance on the detecting plate between each detector and the radiographic source there are differences, cause in the transmission projection image, the projection ratio difference of diverse location place detector, thereby the zones of different that causes object to be detected scaled degree difference in transmission imaging causes the contour of object distortion that is distorted, and is not inconsistent with the object true form.Be embodied in: for onesize object, be placed on apart from radiographic source more nearby be placed on that the person of comparing is big apart from radiographic source at a distance.Because the torsional deformation of subject image makes the safety inspector be not easy to distinguish object type, reduced the accuracy that the safety inspector judges for object to be detected.At present, in channel-type X ray safety inspection field, still do not solve the effective ways of this image deformation.
Summary of the invention
The purpose of this invention is to provide a kind of channel-type X ray safety inspection equipment transmission image deformation bearing calibration, reduce existing safety inspection equipment because failing to judge of causing of scalloping distortion, erroneous judgement problem, help the object in safety inspector's identification more intuitively parcel, to solve the deformation problems that exists in the transmission image.
The objective of the invention is to be achieved through the following technical solutions:
A kind of channel-type X ray safety inspection equipment transmission image deformation bearing calibration may further comprise the steps:
1) the projection scale factor of calculating detector:, calculate the projection scale factor of each detector on each piece detector panel and the plate according to the relation of the position between x-ray source, object channel plane and the detecting plate three in the channel-type X ray security detection equipment;
2) calculating detector deformation correction factor: at each detector, calculate a deformation correction factor respectively, the deformation correction factor is used for the projection scale factor that obtains through step 1) is revised;
3) interpolation processing and amplifying: with process step 2) the deformation correction factor of the detector that obtains is a foundation, transmission image is carried out deformation to be proofreaied and correct, according to the difference of deformation correction factor, each pixel of transmission image is carried out the interpolation processing and amplifying, obtain deformation and proofread and correct result images.
In above-mentioned channel-type X ray safety inspection equipment transmission image deformation bearing calibration, in step 1): described x-ray source and detector lay respectively at the both sides of object channel plane; After passing the object channel plane by the X ray of x-ray source emission, the detector that is positioned at object channel plane opposite side is collected, and through transforming the transmission image that generates object.
In above-mentioned channel-type X ray safety inspection equipment transmission image deformation bearing calibration, in step 1), the projection scale factor that calculates each detector may further comprise the steps:
(1) at first calculates the projection scale factor of each detector to the object channel plane according to the geometric position of detector, object channel plane, x-ray source; The projection scale factor is defined as:
(2) the projection scale factor that will obtain through step (1) is as the projection scale factor of centre position detector on each piece detecting plate;
(3), adopt linear interpolation method to obtain the projection scale factor of all detectors between them according to the projection scale factor of centre position detector on adjacent two detecting plates.
In above-mentioned channel-type X ray safety inspection equipment transmission image deformation bearing calibration, in step 2) in, calculating detector deformation correction factor may further comprise the steps:
(1) at first select some detector projection scale factors as the reference value
Z 0
(2) calculate reference value
Z 0 With the ratio of each detector projection scale factor, obtain the deformation correction factor of each detector
R i :
According to the difference of selecting reference value, the deformation correction factor of detector may also may be less than 1 greater than 1; For selected reference detector, its deformation correction factor is 1.
In above-mentioned channel-type X ray safety inspection equipment transmission image deformation bearing calibration, in step 3), the interpolation processing and amplifying may further comprise the steps:
(1), calculates the picture traverse after original transmission image is proofreaied and correct through deformation according to the deformation correction factor of each detector; The width that the back image is proofreaied and correct in deformation is
, wherein
NFor proofreading and correct preceding picture traverse,
Deformation correction factor sum for all detectors;
(2) calculate the mapping relations of putting through on the original image before each point and the interpolation on the image after step (1) the deformation correction, obtain the interpolation concordance list; The interpolation concordance list is total
M, each position on the picture traverse direction after corresponding respectively the correction; It is as follows that each index list item comprises information: adjacent 2 points of picture traverse direction before this position pixel is mapped to and proofreaies and correct
P x With
P X+1 , and a weight coefficient
F(0≤
F≤ 1);
(3) the interpolation concordance list that obtains according to step (2) adopts image interpolation method to obtain proofreading and correct the back image; Each position pixel value is in the image of correction back:
P x + (
P X+1 -
P x ) *
F
Beneficial effect of the present invention is: can not increase any hardware cost on the basis of existing channel-type X ray safety inspection equipment, only realize the deformation of transmission image is proofreaied and correct by image deformation bearing calibration of the present invention, reduce failing to judge and judging by accident of safety inspector.
Description of drawings
With reference to the accompanying drawings the present invention is described in further detail below.
Fig. 1 is the process flow diagram of the described channel-type X ray of embodiment of the invention safety inspection equipment transmission image deformation bearing calibration;
Fig. 2 be in the described channel-type X ray of the embodiment of the invention safety inspection equipment transmission image deformation bearing calibration between x-ray source, object channel plane and the detecting plate three position concern synoptic diagram;
Fig. 3 is the described image that does not adopt channel-type X ray safety inspection equipment transmission image deformation bearing calibration to handle of the embodiment of the invention;
Fig. 4 is that Fig. 3 adopts the image after channel-type X ray safety inspection equipment transmission image deformation bearing calibration is handled.
Embodiment
Shown in Fig. 1-2, the described a kind of channel-type X ray safety inspection equipment transmission image deformation bearing calibration of the embodiment of the invention may further comprise the steps:
1) the projection scale factor of calculating detector:, calculate the projection scale factor of each detector on each piece detector panel 3 and the plate according to the relation of the position between x-ray source 1, object channel plane 2 and detecting plate 3 threes in the channel-type X ray security detection equipment;
2) calculating detector deformation correction factor: at each detector, calculate a deformation correction factor respectively, the deformation correction factor is used for the projection scale factor that obtains through step 1) is revised;
3) interpolation processing and amplifying: with process step 2) the deformation correction factor of the detector that obtains is a foundation, transmission image is carried out deformation to be proofreaied and correct, according to the difference of deformation correction factor, each pixel of transmission image is carried out the interpolation processing and amplifying, obtain deformation and proofread and correct result images.
In above-mentioned channel-type X ray safety inspection equipment transmission image deformation bearing calibration, in step 1): described x-ray source 1 and detector lay respectively at the both sides of object channel plane 2; After passing object channel plane 2 by the X ray of x-ray source 1 emission, the detector that is positioned at object channel plane 2 opposite sides is collected, and through transforming the transmission image that generates object;
In above-mentioned channel-type X ray safety inspection equipment transmission image deformation bearing calibration, in step 1), the projection scale factor that calculates each detector may further comprise the steps:
(1) at first calculates the projection scale factor of each detector to object channel plane 2 according to the geometric position of detector, object channel plane 2, x-ray source 1; The projection scale factor is defined as:
(2) the projection scale factor that will obtain through step (1) is as the projection scale factor of centre position detector on each piece detecting plate 3;
(3), adopt linear interpolation method to obtain the projection scale factor of all detectors between them according to the projection scale factor of centre position detector on adjacent two detecting plates 3.
In above-mentioned channel-type X ray safety inspection equipment transmission image deformation bearing calibration, in step 2) in, calculating detector deformation correction factor may further comprise the steps:
(1) at first select some detector projection scale factors as the reference value
Z 0
(2) calculate reference value
Z 0 With the ratio of each detector projection scale factor, obtain the deformation correction factor of each detector
R i :
According to the difference of selecting reference value, the deformation correction factor of detector may also may be less than 1 greater than 1; For selected reference detector, its deformation correction factor is 1.
In above-mentioned channel-type X ray safety inspection equipment transmission image deformation bearing calibration, in step 3), the interpolation processing and amplifying may further comprise the steps:
(1), calculates the picture traverse after original transmission image is proofreaied and correct through deformation according to the deformation correction factor of each detector; The width that the back image is proofreaied and correct in deformation is
, wherein
NFor proofreading and correct preceding picture traverse,
Deformation correction factor sum for all detectors;
(2) calculate the mapping relations of putting through on the original image before each point and the interpolation on the image after step (1) the deformation correction, obtain the interpolation concordance list; The interpolation concordance list is total
M, each position on the picture traverse direction after corresponding respectively the correction; It is as follows that each index list item comprises information: adjacent 2 points of picture traverse direction before this position pixel is mapped to and proofreaies and correct
P x With
P X+1 , and a weight coefficient
F(0≤
F≤ 1);
(3) the interpolation concordance list that obtains according to step (2) adopts image interpolation method to obtain proofreading and correct the back image; Each position pixel value is in the image of correction back:
P x + (
P X+1 -
P x ) *
F
The present invention is mainly according to the physical construction feature of channel-type X ray safety inspection equipment, calculate the projection scale factor of each detector on the X ray transmission path, and the method by the view data interpolation, make the projection scale factor of each detector reach unanimity, thereby the torsional deformation of image is proofreaied and correct.During concrete work, after the beam of x-ray source 1 emission passes object channel plane 2, project on the detector that is positioned at object channel plane 2 opposite sides; Detector absorbs X ray and is converted into electric signal; Finally obtain the transmission image data of object after electric signal sampled; Suppose that the detector number is on the equipment detecting plate 3
N, corresponding transmission image width also is
NAccording to the mechanical design structure figure of equipment, measure the width and the relation of the position between each detector, object channel plane 2 and the x-ray source 1 of every detecting plate 3 then; According to the relation of the position between detector, object channel plane 2 and the x-ray source 1, calculate the pairing projection scale factor of each detector on the detecting plate 3; The projection scale factor specifically is defined as: the width of detecting plate 3 correspondence image and the beam that arrives this detecting plate 3 pass the ratio of width of the point of crossing of object channel plane 2; According to the proportionate relationship between the projection scale factor of each detector, the transmission image data are carried out interpolation amplifies, make that the projection scale factor of each detector is tending towards identical, thereby the torsional deformation of image is reasonably proofreaied and correct in the image after interpolation is amplified.
As shown in Figure 3-4, the present invention is applied to the deformation correction of channel-type X ray safety inspection equipment.Fig. 3 is the detected image of a block length square plate in channel-type X ray safety inspection equipment; By image as seen, there is torsional deformation in the shape of steel plate in image, especially shows the latter half of Fig. 3.Fig. 4 is to use the result images after deformation bearing calibration proposed by the invention is proofreaied and correct view data, and the torsional deformation of image has obtained proofreading and correct preferably.Do not increase any hardware cost, only realize the deformation of transmission image is proofreaied and correct, reduce failing to judge and judging by accident of safety inspector by image deformation bearing calibration of the present invention.
Claims (5)
1. a channel-type X ray safety inspection equipment transmission image deformation bearing calibration is characterized in that, may further comprise the steps:
1) the projection scale factor of calculating detector:, calculate the projection scale factor of each detector on each piece detector panel and the plate according to the relation of the position between x-ray source, object channel plane and the detecting plate three in the channel-type X ray security detection equipment;
2) calculating detector deformation correction factor: at each detector, calculate a deformation correction factor respectively, the deformation correction factor is used for the projection scale factor that obtains through step 1) is revised;
3) interpolation processing and amplifying: with process step 2) the deformation correction factor of the detector that obtains is a foundation, transmission image is carried out deformation to be proofreaied and correct, according to the difference of deformation correction factor, each pixel of transmission image is carried out the interpolation processing and amplifying, obtain deformation and proofread and correct result images.
2. channel-type X ray safety inspection equipment transmission image deformation bearing calibration according to claim 1 is characterized in that in step 1): described x-ray source and detector lay respectively at the both sides of object channel plane; After passing the object channel plane by the X ray of x-ray source emission, the detector that is positioned at object channel plane opposite side is collected, and through transforming the transmission image that generates object.
3. channel-type X ray safety inspection equipment transmission image deformation bearing calibration according to claim 1 is characterized in that in step 1), the projection scale factor that calculates each detector may further comprise the steps:
(1) at first calculates the projection scale factor of each detector to the object channel plane according to the geometric position of detector, object channel plane, x-ray source; The projection scale factor is defined as:
(2) the projection scale factor that will obtain through step (1) is as the projection scale factor of centre position detector on each piece detecting plate;
(3), adopt linear interpolation method to obtain the projection scale factor of all detectors between them according to the projection scale factor of centre position detector on adjacent two detecting plates.
4. channel-type X ray safety inspection equipment transmission image deformation bearing calibration according to claim 1 is characterized in that, in step 2) in, calculating detector deformation correction factor may further comprise the steps:
(1) at first select some detector projection scale factors as the reference value
Z 0
(2) calculate reference value
Z 0 With the ratio of each detector projection scale factor, obtain the deformation correction factor of each detector
R i :
According to the difference of selecting reference value, the deformation correction factor of detector may also may be less than 1 greater than 1; For selected reference detector, its deformation correction factor is 1.
5. channel-type X ray safety inspection equipment transmission image deformation bearing calibration according to claim 1 is characterized in that in step 3), the interpolation processing and amplifying may further comprise the steps:
(1), calculates the picture traverse after original transmission image is proofreaied and correct through deformation according to the deformation correction factor of each detector; The width that the back image is proofreaied and correct in deformation is
, wherein
NFor proofreading and correct preceding picture traverse,
Deformation correction factor sum for all detectors;
(2) calculate the mapping relations of putting through on the original image before each point and the interpolation on the image after step (1) the deformation correction, obtain the interpolation concordance list; The interpolation concordance list is total
M, each position on the picture traverse direction after corresponding respectively the correction; It is as follows that each index list item comprises information: adjacent 2 points of picture traverse direction before this position pixel is mapped to and proofreaies and correct
P x With
P X+1 , and a weight coefficient
F(0≤
F≤ 1);
(3) the interpolation concordance list that obtains according to step (2) adopts image interpolation method to obtain proofreading and correct the back image; Each position pixel value is in the image of correction back:
P x + (
P X+1 -
P x ) *
F
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| CN 201110087882 CN102230975B (en) | 2011-04-08 | 2011-04-08 | Transmission image deformation correction method for channel type X-ray safety inspection equipment |
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Cited By (4)
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| CN103200056A (en) * | 2013-03-14 | 2013-07-10 | 上海瑞示电子科技有限公司 | Security check system based on network and method of security check system for achieving cooperative work |
| CN114936988A (en) * | 2022-07-21 | 2022-08-23 | 杭州睿影科技有限公司 | Image correction method and device and electronic equipment |
| CN115598152A (en) * | 2021-07-07 | 2023-01-13 | 同方威视技术股份有限公司（Cn） | Radiation imaging system and radiation imaging method |
| CN116449445A (en) * | 2023-06-15 | 2023-07-18 | 浙江啄云智能科技有限公司 | Correction method, device, medium and equipment for output response value of X-ray detection plate |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200056A (en) * | 2013-03-14 | 2013-07-10 | 上海瑞示电子科技有限公司 | Security check system based on network and method of security check system for achieving cooperative work |
| CN103200056B (en) * | 2013-03-14 | 2016-05-11 | 上海瑞示电子科技有限公司 | Network safe examination system and realize the method for collaborative work |
| CN115598152A (en) * | 2021-07-07 | 2023-01-13 | 同方威视技术股份有限公司（Cn） | Radiation imaging system and radiation imaging method |
| CN115598152B (en) * | 2021-07-07 | 2024-04-19 | 同方威视技术股份有限公司 | Radiographic imaging system and radiographic imaging method |
| CN114936988A (en) * | 2022-07-21 | 2022-08-23 | 杭州睿影科技有限公司 | Image correction method and device and electronic equipment |
| CN114936988B (en) * | 2022-07-21 | 2022-11-01 | 杭州睿影科技有限公司 | Image correction method and device and electronic equipment |
| CN116449445A (en) * | 2023-06-15 | 2023-07-18 | 浙江啄云智能科技有限公司 | Correction method, device, medium and equipment for output response value of X-ray detection plate |
| CN116449445B (en) * | 2023-06-15 | 2023-09-12 | 浙江啄云智能科技有限公司 | Correction method, device, medium and equipment for output response value of X-ray detection plate |
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