CN102360083A - Method for removing belt artifacts in images for line scanning X-ray security inspection equipment - Google Patents
Method for removing belt artifacts in images for line scanning X-ray security inspection equipment Download PDFInfo
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- CN102360083A CN102360083A CN2011102404627A CN201110240462A CN102360083A CN 102360083 A CN102360083 A CN 102360083A CN 2011102404627 A CN2011102404627 A CN 2011102404627A CN 201110240462 A CN201110240462 A CN 201110240462A CN 102360083 A CN102360083 A CN 102360083A
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Abstract
The invention provides a method for removing belt artifacts in images for line scanning X-ray security inspection equipment, wherein a method for dynamically calibrating objects to be inspected one bag by one bag on basis of an optoelectronic switch trigger mode is adopted, that is to say, an optoelectronic switch is triggered when a bag enters a channel each time and then a time-based signal is produced to control the start of an X-ray and the motions such as collection of a detector. After the X-ray is started up, saturated data is immediately collected; and after the bag gets out of the channel and the X-ray is closed, background data is immediately collected and then a new calibration parameter is calculated through a calibration algorithm. Repeating in this way, any part of a belt can be calibrated so as to avoid belt artifacts in images, thereby solving the problem of image artifacts caused by incapability of correcting the state of the current belt through the calibration parameter when the belt of the X-ray security inspection equipment is deviated or the edge of the belt is irregular.
Description
Technical field
The present invention relates to a kind of image calibration technology of X ray screening machine, particularly relate to and a kind ofly be applied in the X-ray-scanning images of object screening machine image peeling with the method for pseudo-shadow.
Background technology
The invention of X ray screening machine and application play an important role to the for example safety precaution in fields such as customs, aviation, communications and transportation.Is example with the bottom according to formula X ray screening machine.Radiographic source is assemblied in device bottom, and X-ray penetrates through belt (also claiming travelling belt or conveyer belt) from the below, passes the object that moves on the belt again and finally on the line sweep detector at equipment top, forms images.Because the each scanning of line sweep detector can only obtain the slice image data of object at current scanning position place, when belt drags object when at the uniform velocity moving, just can be through the complete image that is spliced to form to every row view data.
Because the line sweep detector of X ray screening machine is connected in series by a lot of piece detector modules.Photosensitive-member on each module even each module can be because the technology difference causes light sensitivity inconsistent; That is to say the x-ray bombardment of reception with dosage; The output voltage that obtains is also inconsistent; Thereby,, said X ray screening machine will carry out the primary calibration operation when starting shooting each time to image, so that can detecting accurately, it violates a ban or dangerous goods.
Traditional X ray screening machine is because travelling belt long-term work meeting causes the wearing and tearing of belt periphery, even belt deviation.At this moment, in the time of scan image, screen is the pseudo-shadow that irregular belt edge causes to occur, and has influenced the sharpness of parcel image to be detected.Trace it to its cause is because along with extend the working time of system; For example the belt became uneven is even and burr takes place in the belt edge wearing and tearing; Perhaps temperature causes the drift of background data; And job insecurity causes factors such as saturated data drift all can have influence on background data and saturated data, thereby causes gain parameter can not in time reflect the variation of system.
In the prior art, because traditional X ray screening machine only carries out the primary calibration operation to image in the time of start.Therefore, when belt deviation or edge irregularity, calibration parameter can not be revised current belt state automatically, causes having occurred pseudo-shadow in the images displayed, and then has influence on Security Officer's judgement, and the work of safety precaution has been brought hidden danger.
Summary of the invention
The shortcoming of prior art in view of the above; The object of the present invention is to provide a kind of method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow; To solve X ray screening machine of the prior art when belt deviation or the edge irregularity; Calibration parameter can not be revised current belt state automatically, causes occurring in the images displayed problem of pseudo-shadow.
For realizing above-mentioned purpose and other relevant purposes; The present invention provides a kind of method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow; Said X-ray-scanning images of object screening machine comprises at least; Frame, be arranged at the said detection of detection darkroom, approach darkroom on the said frame be used to carry article to be checked belt, be arranged on said detection darkroom and be positioned at said belt one side x-ray source, be arranged on said detection darkroom and be positioned at said belt opposite side scan detector, be arranged on porch, said detection darkroom in order to the optoelectronic switch of controlling said x-ray source, be arranged on display and CCU on the said frame; It is characterized in that; Said method comprising the steps of: 1) start; Gather initial background data and initial saturated data, and calculate one group of initial gain factor, to generate a current calibration rule; 2) when said optoelectronic switch is blocked by said article to be checked, open said x-ray source behind first Preset Time of delaying time, then, open said scan detector behind second Preset Time of delaying time, gather and upgrade saturated data; 3) judge whether said optoelectronic switch is still blocked by said article to be checked, if according to said current calibration rule the view data of scanning is calibrated, and show by the row splicing; If not, close said scan detector behind the 3rd Preset Time of then delaying time, then, close said x-ray source behind the 4th Preset Time of delaying time, open said scan detector once more behind the 5th Preset Time of delaying time, gather and upgrade the background data; And 4) go out one group according to saturated data of said renewal and said renewal background data computation and upgrade gain coefficient; And it is regular to upgrade said current calibration according to said renewal gain coefficient; And be back to step 2), according to the current calibration rule after this renewal view data is being calibrated in the scanning operation next time.
In the method for the invention, said scan detector includes a plurality of detector modules, and respectively has a plurality of sensitivity specks in this detector module.In concrete embodiment, the sensitivity speck in the said scan detector is n, and wherein a sensitivity speck is designated as i, and then said renewal background data are designated as V
Off i(i=1,2,3 ... .n); The saturated data of said renewal are designated as V
On i(i=1,2,3 ... .n); Said renewal gain coefficient then is G
i=2
x/ (V
On i-V
Off i), (i=1,2,3 ... N); And the current calibration rule after the said renewal is V
Real i=(V
i-V
Off i) * G
i, (i=1,2,3 ... N); Wherein, x is the AD precision figure place of said scan detector, V
iActual voltage value for this sensitivity speck i.
In the step 1) of the inventive method, comprising: 1-1) start; 1-2) open said scan detector, each sensitivity speck of each detector module in the said scan detector carried out the primary voltage data acquisition, with the voltage data of each sensitivity speck that obtains as initial background data; 1-3) open said x-ray source, each sensitivity speck of each detector module in the said scan detector carried out the primary voltage data acquisition again, with the voltage data of each sensitivity speck that obtains as initial saturated data; And 1-4) goes out one group of initial gain factor according to said initial background data and said initial saturated data computation, to generate a current calibration rule.In concrete embodiment, the sensitivity speck in the said scan detector is n, and wherein a sensitivity speck is designated as i, and then said initial background data are designated as V
Off i(i=1,2,3 ... .n); Said initial saturated data are designated as V
On i(i=1,2,3 ... .n); Said initial gain factor then is G
i=2
x/ (V
On i-V
Off i), (i=1,2,3 ... N); And said current calibration rule is V
Real i=(V
i-V
Off i) * G
i, (i=1,2,3 ... N); Wherein, x is the AD precision figure place of said scan detector, V
iActual voltage value for this sensitivity speck i.
The time of in the method for the invention, gathering said initial saturated data or the saturated data of said renewal is not more than 20ms; The time of gathering said initial background data or said renewal background data is not more than 20ms.
In the method for the invention, the time-delay starting point of said first Preset Time and second Preset Time is the moment that said optoelectronic switch is blocked by said article to be checked, and said second Preset Time is greater than said first Preset Time.Said the 3rd Preset Time, the 4th Preset Time, and the time-delay starting point of the 5th Preset Time be to judge the moment that said optoelectronic switch is not blocked by said article to be checked, and said the 5th Preset Time greater than said the 4th Preset Time greater than said the 3rd Preset Time.
As stated; The method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow of the present invention; Adopted the method that article to be checked are carried out dynamic calibration packet-by-packet based on the optoelectronic switch triggering mode; Trigger optoelectronic switch behind promptly each parcel admission passage, and as actions such as time-base signal control X ray switching and detector collections.After X ray is opened, carry out the saturation degree collection, when parcel rolls the passage X ray away from and cuts out, carry out the background data acquisition again, and then calculate new calibration parameter through calibration algorithm.So back and forth go down and just can carry out calibration process any position of belt; Stopped to occur in the image phenomenon of the pseudo-shadow of belt; And then solved in the prior art; When belt deviation or edge irregularity, calibration parameter can not be revised current belt state automatically but cause the problem of image artifacts.
Description of drawings
Fig. 1 is shown as the present invention and is applied to the method flow diagram of the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow.
Fig. 2 is shown as the present invention and is applied to the particular flow sheet of the peeling of image in the X-ray-scanning images of object screening machine with step S10 in the method for pseudo-shadow.
Fig. 3 is shown as the present invention and is applied to the peeling of image in the X-ray-scanning images of object screening machine and implements sequential chart with the dynamic calibration of the method for pseudo-shadow.
Embodiment
Below through specific instantiation embodiment of the present invention is described, those skilled in the art can understand other advantages of the present invention and effect easily by the content that this instructions disclosed.The present invention can also implement or use through other different embodiment, and each item details in this instructions also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
See also Fig. 1, be shown as the method flow diagram that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow of the present invention.Need to prove; The diagram that is provided in the present embodiment is only explained basic conception of the present invention in a schematic way; Satisfy only show in graphic with the present invention in relevant assembly but not component count, shape and plotted when implementing according to reality; Kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also maybe be more complicated.
The present invention provides a kind of method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow; Said X-ray-scanning images of object screening machine comprises at least, frame, be arranged at the said detection of detection darkroom, approach darkroom on the said frame be used to carry article to be checked (for example parcel and luggage etc.) belt, be arranged on said detection darkroom and be positioned at said belt one side x-ray source, be arranged on said detection darkroom and be positioned at said belt opposite side scan detector, be arranged on porch, said detection darkroom in order to the optoelectronic switch of controlling said x-ray source, be arranged on the said frame display and in order to control the CCU of above-mentioned each module operation.
Need to prove; Because said modules realizes the necessary assembly of its function for the X ray screening machine; And of the present inventionly focus on providing a kind of and be applied in the X-ray-scanning images of object screening machine image peeling with the method for pseudo-shadow; Thereby in this embodiment, each assembly in the said X-ray-scanning images of object screening machine will no longer be drawn diagram, state clearly hereby.
In addition; For the technology contents of putting down in writing below the easy to understand; What still need explain is that in X ray screening machine of the present invention, x-ray source on-off action and image display action and time-delay control are all by said CCU control; The on-off action of said optoelectronic switch is to be triggered by the article to be checked through said detection darkroom inlet, thereby the signal after the triggering also is to pass to said CCU to cause corresponding operation.
In the present invention; Described optoelectronic switch only describes with the example that act as of a trigger signal generator; But be not limited thereto, other functions of said optoelectronic switch, the effect of for example article to be checked (for example parcel and luggage etc.) being counted etc. will not be given unnecessary details one by one.
Said scan detector includes a plurality of detector modules, and respectively has a plurality of sensitivity specks (also claiming pixel) in this detector module.In the present embodiment, the sensitivity speck in the said scan detector is n, and wherein a sensitivity speck is designated as i, i=1 then, 2,3 ... .n.For example the detector with 12 AD precision is an example, and the sensitivity speck in the said scan detector is 4096, is 4096 grades of gray scales.
See also Fig. 1 and Fig. 2, Fig. 1 is shown as the present invention and is applied to the method flow diagram of the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow; Fig. 2 is shown as the present invention and is applied to the particular flow sheet of the peeling of image in the X-ray-scanning images of object screening machine with step S10 in the method for pseudo-shadow.As shown in the figure, the present invention is applied to the method that image is removed the peel with pseudo-shadow in the X-ray-scanning images of object screening machine and may further comprise the steps:
At first execution in step S10 starts shooting, and gathers initial background data and initial saturated data, and calculates one group of initial gain factor, to generate a current calibration rule.In the present embodiment, said step S10 may further comprise the steps:
At first execution in step S101 starts shooting.Follow execution in step S102.
In step S102; Open said scan detector, each sensitivity speck of each detector module in the said scan detector carried out the primary voltage data acquisition, with the voltage data of each sensitivity speck that obtains as initial background data; In concrete implementation process; The x-ray source of this moment is a closed condition, and said scan detector is once sampled to each sensitivity speck in each module (perhaps being pixel), is provided with n sensitivity speck; The voltage data that obtains is called initial background data, and just scan detector is in the output that does not have under the X-ray irradiation.Said initial background data are designated as:
V
Off?i(i＝1，2，3….n)；
In concrete implementation process, the time of gathering said initial background data is not more than 20ms.What said initial background data reflected is that scan detector is at the components and parts noise data that does not receive under any irradiation.Follow execution in step S103.
In step S103, open said x-ray source, each sensitivity speck of each detector module in the said scan detector is carried out the primary voltage data acquisition again, with the voltage data of each sensitivity speck that obtains as initial saturated data.In concrete implementation process; Open said x-ray source; Each module is once sampled again, and the voltage data that obtains is called initial saturated data, and just scan detector is opened under the condition and the middle output voltage that obtains when having no object to block at x-ray source.Said initial saturated data are designated as:
V
on?i(i＝1，2，3…n)
In concrete implementation process, the time of gathering said initial saturated data is not more than 20ms.What said initial saturated data reflected is the maximum output response of each sensitivity speck on the detector.Follow execution in step S104.
In step S104, go out one group of initial gain factor according to said initial background data and said initial saturated data computation, to generate a current calibration rule.Particularly, be for each the sensitivity speck calculated gains value on each module.Be designated as:
G
i=2
x/ (V
On i-V
Off i), (i=1,2,3 ... N), wherein, x is the AD precision figure place of said scan detector, because in this embodiment, for example the detector with 12 AD precision is an example, and the sensitivity speck in the said scan detector is 4096 (promptly 2
12), then
G
i＝4096/(V
on?i-V
Off?i)，(i＝1，2，3…n)；
That is to say, calculate under current environment, the amplitude that promptly each sensitivity speck need be revised under temperature, belt, the x-ray source state.
In the present embodiment, said current calibration rule converts through following formula and obtains:
V
Real i=(V
i-V
Off i) * G
i, (i=1,2,3 ... N); Wherein, V
iActual voltage value for this sensitivity speck i.
At this moment, described V
Real iBe exactly the magnitude of voltage that each pixel correction is crossed on the image, be reflected to through image processing means again and carry out the gray scale demonstration on the screen.
Follow execution in step S11.
Please cooperate and consult Fig. 3, be shown as the present invention and be applied to the peeling of image in the X-ray-scanning images of object screening machine and implement sequential chart with the dynamic calibration of the method for pseudo-shadow.In step S11, judge whether said optoelectronic switch is blocked by said article to be checked, in other words; Promptly judge and whether placed article to be checked on the said belt (for example parcel and luggage etc.) and sheltered from the light that is transmitted into its receiving end of this optoelectronic switch; If then proceed to step S12, if not; Then return step S11, continue to judge.
In step S12, said x-ray source is opened in first preset time T of delaying time, 1 back, then execution in step S13.
In step S13, said scan detector is opened in second preset time T of delaying time, 2 backs, gathers and upgrades saturated data; In concrete implementation process; When the said optoelectronic switch of said article to be checked forward position process, promptly from being blocked state, it sends a high level signal to optoelectronic switch.Delaying x-ray source through first preset time T 1 opens.The setting of said first preset time T 1 is will guarantee said article to be checked forward position through behind the said optoelectronic switch, continues to drive to almost and opens x-ray source again near the scanning position of detection darkroom centre.If article shading light electric switch to be checked is arranged always, x-ray source is just opened, and can waste the life-span of x-ray source like this.Thereby,, x-ray source upgrades saturated data through just beginning to open the scan detector collection after 2 these time-delays of second preset time T again after opening, continuously carry out scanning collection.Be in order before collection, to let x-ray source can fully open and stable bright dipping like this.Because each x-ray source unlatching all need be stablized the hundreds of millisecond and could be guaranteed stabilized intensity.So in the step S12 and S13 of present embodiment, the time-delay starting point of said first Preset Time and second Preset Time is the moment that said optoelectronic switch is blocked by said article to be checked, and said second Preset Time is greater than said first Preset Time.
Need to prove; In the present embodiment; Do not provide the concrete time value of said first Preset Time and second Preset Time; Be because method of the present invention is applied to specification or detects the passage length in darkroom, or in the different X ray screening machine of the travelling speed of belt the time, can preset the concrete numerical value of said first Preset Time and second Preset Time according to the applicable cases of reality.
The time of in the present embodiment, gathering the saturated data of said renewal is not more than 20ms.The saturated data of said renewal are designated as: V
On i(i=1,2,3 ... N)
Follow execution in step S14.
In step S14, judge whether said optoelectronic switch is still blocked by said article to be checked, if, then proceed to step S15, if not, then proceed to step S16.
In step S15, according to said current calibration rule the view data of scanning is calibrated, and show, and return and continue among the step S14 to judge by the row splicing.
In step S16, close said scan detector after the 3rd preset time T 3 of delaying time, then execution in step S17.
In step S17, close said x-ray source after the 4th preset time T 4 of delaying time, then execution in step S18.
In step S18, open said scan detector once more after the 5th preset time T 5 of delaying time, gather and upgrade the background data.The time of in the present embodiment, gathering said renewal background data is not more than 20ms.Said renewal background data are designated as: V
Off i(i=1,2,3 ... .n).
In concrete implementation process, when judging said optoelectronic switch and do not blocked, explain promptly behind the said article to be checked that along sailing out of optoelectronic switch, it is unimpeded that optoelectronic switch recovers, its output low level signal by said article to be checked.After this, said article to be checked also will could thoroughly pass through to detect the scanning position of darkroom central authorities after motion a period of time on the belt.Therefore, after the edge is left after said optoelectronic switch detects object, close said scan detector after the 3rd preset time T 3 of delaying time, close said x-ray source after the 4th preset time T 4 of delaying time again.If closing x-ray source earlier closes scan detector again and can cause IMAQ to close slow and collect upgrading the background data, cause occurring on the image the vertical striped of black.
In the present embodiment; As shown in Figure 3; Said the 3rd Preset Time, the 4th Preset Time, and the time-delay starting point of the 5th Preset Time be to judge the moment that said optoelectronic switch is not blocked by said article to be checked; Be that optoelectronic switch is sailed out of on the edge behind the said article to be checked, it is unimpeded that optoelectronic switch recovers, the moment of its output low level signal.And said the 5th Preset Time greater than said the 4th Preset Time greater than said the 3rd Preset Time.Need to prove; In the present embodiment; Do not provide said the 3rd Preset Time, the 4th Preset Time, and the concrete time value of the 5th Preset Time; Be because method of the present invention is applied to specification or detects the passage length in darkroom, or in the different X ray screening machine of the travelling speed of belt the time, can preset said the 3rd Preset Time, the 4th Preset Time, reach the concrete numerical value of the 5th Preset Time according to the applicable cases of reality.
Follow execution in step S19.
In step S19, go out one group according to saturated data of said renewal and said renewal background data computation and upgrade gain coefficient, and upgrade said current calibration rule according to said renewal gain coefficient, in the present embodiment, G
i=2
x/ (V
On i-V
Off i), (i=1,2,3 ... N), wherein, x is the AD precision figure place of said scan detector, because in this embodiment, for example the detector with 12 AD precision is an example, and the sensitivity speck in the said scan detector is 4096 (promptly 2
12), the current calibration rule after the then said renewal is V
Real i, in the present embodiment, the regular V of current calibration after the renewal
Real iObtain through following formula conversion:
Be V
Real i=(V
i-V
Off i) * G
i, (i=1,2,3 ... N); Wherein, V
iActual voltage value for this sensitivity speck i.
At last, be back to step 2), the regular V of current calibration after in scanning operation next time, upgrading according to this
Real iView data is calibrated.
By on can know; The method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow of the present invention; When but each article to be checked get into the detection darkroom go back the no show scanning position; Because this moment, scan line position was not blocked by any object, open x-ray source and upgrade the saturation degree collection fast this moment; Detect the darkroom when article to be checked roll away from, once upgrade the collection of background data after x-ray source is closed again fast; The renewal background data that utilization obtains are upgraded the Gi gain parameter again with the saturated data of renewal and are prepared to next article use to be checked.So back and forth go down and just can carry out calibration process, stopped to occur in the image of traditional X ray screening machine the phenomenon of the pseudo-shadow of belt any position of belt.
In sum; The method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow of the present invention; Adopted the method that article to be checked are carried out dynamic calibration packet-by-packet based on the optoelectronic switch triggering mode; Trigger optoelectronic switch behind promptly each parcel admission passage, and as actions such as time-base signal control X ray switching and detector collections.After X ray is opened, carry out the saturation degree collection, when parcel rolls the passage X ray away from and cuts out, carry out the background data acquisition again, and then calculate new calibration parameter through calibration algorithm.So back and forth go down and just can carry out calibration process any position of belt; Stopped to occur in the image phenomenon of the pseudo-shadow of belt; And then solved in the prior art; When belt deviation or edge irregularity, calibration parameter can not be revised current belt state automatically but cause the problem of image artifacts.So the present invention has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any be familiar with this technological personage all can be under spirit of the present invention and category, the foregoing description is modified or is changed.Therefore, have common knowledge the knowledgeable in the affiliated such as technical field, must contain by claim of the present invention not breaking away from all equivalence modifications of being accomplished under disclosed spirit and the technological thought or changing.
Claims (9)
1. method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow; Said X-ray-scanning images of object screening machine comprises at least; Frame, be arranged at the said detection of detection darkroom, approach darkroom on the said frame be used to carry article to be checked belt, be arranged on said detection darkroom and be positioned at said belt one side x-ray source, be arranged on said detection darkroom and be positioned at said belt opposite side scan detector, be arranged on porch, said detection darkroom in order to the optoelectronic switch of controlling said x-ray source, be arranged on display and CCU on the said frame; It is characterized in that, said method comprising the steps of:
1) start is gathered initial background data and initial saturated data, and is calculated one group of initial gain factor, to generate a current calibration rule;
2) when said optoelectronic switch is blocked by said article to be checked, open said x-ray source behind first Preset Time of delaying time, then, open said scan detector behind second Preset Time of delaying time, gather and upgrade saturated data;
3) judge whether said optoelectronic switch is still blocked by said article to be checked, if according to said current calibration rule the view data of scanning is calibrated, and show by the row splicing; If not, close said scan detector behind the 3rd Preset Time of then delaying time, then, close said x-ray source behind the 4th Preset Time of delaying time, open said scan detector once more behind the 5th Preset Time of delaying time, gather and upgrade the background data; And
4) go out one group according to saturated data of said renewal and said renewal background data computation and upgrade gain coefficient; And it is regular to upgrade said current calibration according to said renewal gain coefficient; And be back to step 2), according to the current calibration rule after this renewal view data is being calibrated in the scanning operation next time.
2. the method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow according to claim 1 is characterized in that:
Said scan detector includes a plurality of detector modules, and respectively has a plurality of sensitivity specks in this detector module.
3. the method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow according to claim 2 is characterized in that:
Sensitivity speck in the said scan detector is n, and wherein a sensitivity speck is designated as i, then
Said renewal background data are designated as V
Off i(i=1,2,3 ... .n);
The saturated data of said renewal are designated as V
On i(i=1,2,3 ... .n);
Said renewal gain coefficient then is G
i=2
x/ (V
On i-V
Off i), (i=1,2,3 ... N); And
Current calibration rule after the said renewal is V
Real i=(V
i-V
Off i) * G
i, (i=1,2,3 ... N); Wherein, x is the AD precision figure place of said scan detector, V
iActual voltage value for this sensitivity speck i.
4. the method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow according to claim 2 is characterized in that:
In said step 1), comprising:
1-1) start;
1-2) open said scan detector, each sensitivity speck of each detector module in the said scan detector carried out the primary voltage data acquisition, with the voltage data of each sensitivity speck that obtains as initial background data;
1-3) open said x-ray source, each sensitivity speck of each detector module in the said scan detector carried out the primary voltage data acquisition again, with the voltage data of each sensitivity speck that obtains as initial saturated data; And
1-4) go out one group of initial gain factor, to generate a current calibration rule according to said initial background data and said initial saturated data computation.
5. the method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow according to claim 4 is characterized in that:
Sensitivity speck in the said scan detector is n, and wherein a sensitivity speck is designated as i, then
Said initial background data are designated as V
Off i(i=1,2,3 ... .n);
Said initial saturated data are designated as V
On i(i=1,2,3 ... .n);
Said initial gain factor then is G
i=2
x/ (V
On i-V
Off i), (i=1,2,3 ... N); And
Said current calibration rule is V
Real i=(V
i-V
Off i) * G
i, (i=1,2,3 ... N); Wherein, x is the AD precision figure place of said scan detector, V
iActual voltage value for this sensitivity speck i.
6. the method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow according to claim 1 is characterized in that:
Gathering said initial saturated data or said renewal gathers the time of saturated data and is not more than 20ms.
7. the method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow according to claim 1 is characterized in that:
The time of gathering said initial background data or said renewal collection background data is not more than 20ms.
8. the method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow according to claim 1 is characterized in that:
The time-delay starting point of said first Preset Time and second Preset Time is the moment that said optoelectronic switch is blocked by said article to be checked, and said second Preset Time is greater than said first Preset Time.
9. the method that is applied to the peeling of image in the X-ray-scanning images of object screening machine with pseudo-shadow according to claim 1 is characterized in that:
Said the 3rd Preset Time, the 4th Preset Time, and the time-delay starting point of the 5th Preset Time be to judge the moment that said optoelectronic switch is not blocked by said article to be checked, and said the 5th Preset Time greater than said the 4th Preset Time greater than said the 3rd Preset Time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110240462 CN102360083B (en) | 2011-08-19 | 2011-08-19 | Method for removing belt artifacts in images for line scanning X-ray security inspection equipment |
Applications Claiming Priority (1)
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| CN103487449A (en) * | 2013-05-27 | 2014-01-01 | 深圳市天和时代电子设备有限公司 | Dynamic calibration method |
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