CN105046724B - Double image point barycenter extracting method in Differential Image motion air relevant parameters test - Google Patents
Double image point barycenter extracting method in Differential Image motion air relevant parameters test Download PDFInfo
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Abstract
The present invention discloses the double image point barycenter extracting method in a kind of Differential Image motion air relevant parameters test.Double image dot image just automatically can be divided into two single picture point images by this method without human assistance.For every single picture point image, this method can choose the bounding box position of single picture point automatically, exclude the influence that those pixels not covered by picture point are extracted to picture point barycenter, to suppress the picture point barycenter extraction accuracy reduction that the output noise of imaging sensor is caused.This method is in real time stored in the double facula mass center coordinates extracted in test process in test record file, and data that can at any time in test record file after completion test calculate Fried parameter values.
Description
Technical field
The invention belongs to atmospheric optics technical field of measurement and test, it is related in a kind of Differential Image motion air relevant parameters test
Double image point barycenter extracting method.
Background technology
In the application such as optic communication, astronomical observation, generally require to know the atmospheric turbulence intensity on light transmission path in star.
Generally the turbulence intensity of whole atmosphere is measured with atmospheric coherence length (i.e. Fried parameters).At present, many documents are all mentioned,
Measure the fluctuating of the difference of light wave angle of arrival with the Differential Image method of movement, so according to angle of arrival structure function and Fried parameters it
Between theory relation obtain Fried parameter values.Based on Differential Image method of movement measurement Fried parameters it is crucial that to extract image
The barycenter of two picture points in the image of sensor output.Sat in the barycenter for obtaining a series of two picture points of continuous picture frames
After mark, can be had mercy on direct basis it is auspicious in it is written《Modern Atmospheric Optics》In theoretical model, calculate and arrive per two field picture is corresponding
Up to angle the component parallel and perpendicular to aperture center line direction differenceWithFor a series of continuous
Picture frame, can obtain a series ofWithValue；It is a series of for thisWithValue, meter
CalculateWithAverage value, just obtain angle of arrival parallel and perpendicular to aperture center line direction
Structure function.For night tests, because starlight is fainter, cause the output signal-to-noise ratio of imaging sensor not high, scheme
As the various noises that sensor is exported influence very big to the barycenter extraction accuracy of two picture points.Air phase trepang is moved to Differential Image
Double image dot image in number test is analyzed it can be found that those gray values not covered by picture point are more than 0 image pixel
It is actually all affected by noise, if when extracting picture point barycenter, however not excluded that the shadow of those image pixels not covered by picture point
Ring, then when flicker causes picture point brightness very low, barycenter extracts error can be very big.The present invention provides a kind of Differential Image motion air
Double image point barycenter extracting method in relevant parameters test, when extracting picture point barycenter, can exclude automatically it is most not by
The influence of the image pixel of picture point covering, is remarkably improved barycenter extraction accuracy.
The content of the invention
The equipment that this method is related to includes Differential Image method of movement test optical system, imaging sensor and computer；Such as Fig. 1
Shown, starlight is incided after being transmitted through atmosphere in two input apertures of Differential Image method of movement test optical system, transformed
After be again incident on imaging sensor, imaging sensor output double image dot image be transmitted to computer, it is complete on computers
The extraction of picture point center-of-mass coordinate in pairs.As shown in Fig. 2 the origin of coordinate system is arranged on the lower left corner of double image dot image, seat
The x-axis direction of mark system is set to the horizontal direction along double image dot image, and the y-axis direction of coordinate system is set to along double image dot image
Vertical direction；When installing Differential Image method of movement test optical system and imaging sensor, it is ensured that image during without Turbulent Flow Effects
Horizontal direction of the double image point barycenter line of the double image dot image of sensor output parallel to double image dot image.
This method realizes step：
Step001：Start computer, the double image dot image that continuous acquisition n frames come from imaging sensor transmission, n >=10；Profit
With computer program, it is double image point that two-dimensional array an IMAG, M comprising M rows, N column elements are created in the internal memory of computer
Total number of lines of pixels of image, N is total pixel columns of double image dot image；Array IMAG all elements are all entered as 0；To I
=1,2 ..., M, J=1,2 ..., N calculate I rows, the gray value of J row pixels of all n frames double image dot images collected
Sum A001, gray value sum A001 divided by n result is assigned to array IMAG I rows, J column elements；
Step002：Using computer program, an one-dimension array for including N number of element is created in the internal memory of computer
HIST；To J=1,2 ..., N, the array IMAG J all elements value sums arranged are assigned to HIST j-th elements；
Step003：Divided byResult be assigned to variable X S, HIST (J) represent array
The value of HIST j-th element；Order Expression rounds up；
Step004：If receiving stopping test command, go to step Step008, otherwise gather a frame it is new from image sensing
The double image dot image A002 that device transmission comes；The gray value of the pixel of the 1st of image A002 to M rows, the 1st to Idx row is protected
One is stored to include in M rows, the two-dimensional array A003 of Idx column elements, i.e., to I=1,2 ..., M, J=1,2 ..., Idx, figure
The gray value of I rows, J row pixels as A002 is assigned to array A003 I rows, J column elements；The of image A002
1 to M rows, Idx+1 to Nth column pixel gray value be saved in one comprising M rows, N-Idx column elements two-dimensional array
In A004, i.e., to I=1,2 ..., M, J=Idx+1, Idx+2 ..., N, the gray scale of I rows, J row pixels image A002
Value is assigned to array A004 I rows, J-Idx column elements；
Step005：The numbering MI and the numbering MJ of row of row where the element for the value maximum for finding out array A003, if number
The maximum of element in group A003 is simultaneously corresponding to multiple elements, then where finding out any one maximum element therein
The capable numbering MI and numbering MJ of row；Make i1=max (1, MI-W), i2=min (M, MI+W), j1=max (1, MJ-W), j2=
Min (Idx, MJ+W), max (X, Y) expression take the maximum among X and Y, and min (X, Y) represents to take the minimum value among X and Y, W
For integer, W represents half length of side of picture point bounding box；It is calculated as follows expression formula：WithWherein A003 (I, J) represents array A003 I rows, the value of the element of J row；
Step006：The numbering MI2 and the numbering MJ2 of row of row where the element for the value maximum for finding out array A004, if
The maximum of element in array A004 then finds out any one maximum element place therein simultaneously corresponding to multiple elements
Row numbering MI2 and row numbering MJ2；Make i1=max (1, MI2-W), i2=min (M, MI2+W), j1=max (1, MJ2-
W), j2=min (N-Idx, MJ2+W)；It is calculated as follows expression formula：
WithWherein A004 (I, J) represents array A004
I rows, J row element value；
Step007：The center-of-mass coordinate of double image point is exported to test record file using computer program, wherein left picture point
The x coordinate of barycenter is (clj-0.5)×wp, the y-coordinate of the barycenter of left picture point is (cli-0.5)×hp, the x seats of the barycenter of right picture point
Mark is (crj+Idx-0.5)×wp, the y-coordinate of the barycenter of right picture point is (cri-0.5)×hp, wpRepresent the pixel of imaging sensor
Width, hpRepresent the height of the pixel of imaging sensor；OrderGo to step Step004；
Step008：Stop double image point barycenter and extract operation.
Beneficial effect
The invention provides the double image point barycenter extracting method in a kind of motion air relevant parameters test of Differential Image, surveying
During examination, double image dot image automatically can be divided into two single picture point figures by this method in the case of without human assistance
Picture, and the bounding box position of single picture point is chosen automatically, to exclude the influence of those pixels not covered by picture point, so as to reduce
Influence of the output noise of imaging sensor to picture point barycenter extraction accuracy.This method can be in test process in real time double
The center-of-mass coordinate data of picture point are stored in test record file.After the completion of test, it can be remembered at any time according to test
Data in record file calculate Fried parameter values.
Brief description of the drawings
Fig. 1 is the hardware device composition schematic diagram that this method is related to.Fig. 2 is double image dot image and the relation of coordinate system.
Embodiment
In order that the feature and advantage of this method are more clearly understood, this method is made into one with reference to specific embodiment
The description of step.In the present embodiment, n=20 is made, double image is detected using the height of the pixel imaging sensor equal with width
Dot image.
The equipment that this method is related to includes Differential Image method of movement test optical system, imaging sensor and computer；Such as Fig. 1
Shown, starlight is incided after being transmitted through atmosphere in two input apertures of Differential Image method of movement test optical system, transformed
After be again incident on imaging sensor, imaging sensor output double image dot image be transmitted to computer, it is complete on computers
The extraction of picture point center-of-mass coordinate in pairs.As shown in Fig. 2 the origin of coordinate system is arranged on the lower left corner of double image dot image, seat
The x-axis direction of mark system is set to the horizontal direction along double image dot image, and the y-axis direction of coordinate system is set to along double image dot image
Vertical direction；When installing Differential Image method of movement test optical system and imaging sensor, it is ensured that image during without Turbulent Flow Effects
Horizontal direction of the double image point barycenter line of the double image dot image of sensor output parallel to double image dot image.
This method realizes step：
Step001：Start computer, the double image dot image that continuous acquisition n frames come from imaging sensor transmission, n >=10；Profit
With computer program, it is double image point that two-dimensional array an IMAG, M comprising M rows, N column elements are created in the internal memory of computer
Total number of lines of pixels of image, N is total pixel columns of double image dot image；Array IMAG all elements are all entered as 0；To I
=1,2 ..., M, J=1,2 ..., N calculate I rows, the gray value of J row pixels of all n frames double image dot images collected
Sum A001, gray value sum A001 divided by n result is assigned to array IMAG I rows, J column elements；
Step002：Using computer program, an one-dimension array for including N number of element is created in the internal memory of computer
HIST；To J=1,2 ..., N, the array IMAG J all elements value sums arranged are assigned to HIST j-th elements；
Step003：Divided byResult be assigned to variable X S, HIST (J) represent array
The value of HIST j-th element；Order Expression rounds up；
Step004：If receiving stopping test command, go to step Step008, otherwise gather a frame it is new from image sensing
The double image dot image A002 that device transmission comes；The gray value of the pixel of the 1st of image A002 to M rows, the 1st to Idx row is protected
One is stored to include in M rows, the two-dimensional array A003 of Idx column elements, i.e., to I=1,2 ..., M, J=1,2 ..., Idx, figure
The gray value of I rows, J row pixels as A002 is assigned to array A003 I rows, J column elements；The of image A002
1 to M rows, Idx+1 to Nth column pixel gray value be saved in one comprising M rows, N-Idx column elements two-dimensional array
In A004, i.e., to I=1,2 ..., M, J=Idx+1, Idx+2 ..., N, the gray scale of I rows, J row pixels image A002
Value is assigned to array A004 I rows, J-Idx column elements；
Step005：The numbering MI and the numbering MJ of row of row where the element for the value maximum for finding out array A003, if number
The maximum of element in group A003 is simultaneously corresponding to multiple elements, then where finding out any one maximum element therein
The capable numbering MI and numbering MJ of row；Make i1=max (1, MI-W), i2=min (M, MI+W), j1=max (1, MJ-W), j2=
Min (Idx, MJ+W), max (X, Y) expression take the maximum among X and Y, and min (X, Y) represents to take the minimum value among X and Y, W
For integer, W represents half length of side of picture point bounding box；It is calculated as follows expression formula：WithWherein A003 (I, J) represents array A003 I rows, the value of the element of J row；
Step006：The numbering MI2 and the numbering MJ2 of row of row where the element for the value maximum for finding out array A004, if
The maximum of element in array A004 then finds out any one maximum element place therein simultaneously corresponding to multiple elements
Row numbering MI2 and row numbering MJ2；Make i1=max (1, MI2-W), i2=min (M, MI2+W), j1=max (1, MJ2-
W), j2=min (N-Idx, MJ2+W)；It is calculated as follows expression formula：
WithWherein A004 (I, J) represents array A004
I rows, J row element value；
Step007：The center-of-mass coordinate of double image point is exported to test record file using computer program, wherein left picture point
The x coordinate of barycenter is (clj-0.5)×wp, the y-coordinate of the barycenter of left picture point is (cli-0.5)×hp, the x seats of the barycenter of right picture point
Mark is (crj+Idx-0.5)×wp, the y-coordinate of the barycenter of right picture point is (cri-0.5)×hp, wpRepresent the pixel of imaging sensor
Width, hpRepresent the height of the pixel of imaging sensor；OrderGo to step Step004；
Step008：Stop double image point barycenter and extract operation.
The choosing method of the value of parameter W in step Step005 and step Step006：Before the test begins, using calculating
The double image dot image that the transmission of the two field picture sensor of machine continuous acquisition 80 comes, is grasped using the image addition in Computer Image Processing
Make, this 80 frame double image dot image is superimposed, obtained in a new double image dot image B001, double image dot image B001
Image spot size can be bigger than the image spot size in the single frames double image dot image of computer acquisition；One is drawn on double image dot image B001
The bounding box BBOX of square, the size for setting bounding box BBOX is can surrounding left picture point and surrounding right picture point for minimum
Size, as shown in Fig. 2 picture point corresponding bounding box in left and right is two bounding boxes of length of side identical in figure.Calculate bounding box BBOX
The image pixel number NP of covering, order
Claims (1)
1. the double image point barycenter extracting method in Differential Image motion air relevant parameters test, it is characterised in that required equipment
With realize that step is as follows：
The equipment that this method is related to includes Differential Image method of movement test optical system, imaging sensor and computer；Starlight is through big
Gas-bearing formation transmission after incide the Differential Image method of movement test optical system two input apertures in, it is transformed after be again incident on image
On sensor, the double image dot image of imaging sensor output is transmitted to computer, and double image point barycenter is completed on computers and is sat
Target is extracted；The origin of coordinate system is arranged on the lower left corner of double image dot image, the x-axis direction of coordinate system is set to along double image
The horizontal direction of dot image, is set to the y-axis direction of coordinate system the vertical direction along double image dot image；Differential Image fortune is being installed
When dynamic method test optical system and imaging sensor, it is ensured that pair for the double image dot image that imaging sensor is exported during without Turbulent Flow Effects
Horizontal direction of the picture point barycenter line parallel to double image dot image；
This method realizes step：
Step001：Start computer, the double image dot image that continuous acquisition n frames come from imaging sensor transmission, n >=10；Utilize meter
Calculation machine program, it is double image dot image that two-dimensional array an IMAG, M comprising M rows, N column elements are created in the internal memory of computer
Total number of lines of pixels, N be double image dot image total pixel columns；Array IMAG all elements are all entered as 0；To I=1,
2 ..., M, J=1,2 ..., N calculate I rows, the gray value sum of J row pixels of all n frames double image dot images collected
A001, gray value sum A001 divided by n result is assigned to array IMAG I rows, J column elements；
Step002：Using computer program, an one-dimension array HIST for including N number of element is created in the internal memory of computer；
To J=1,2 ..., N, the array IMAG J all elements value sums arranged are assigned to HIST j-th elements；
Step003：Divided byResult be assigned to variable X S, HIST (J) represent array
The value of HIST j-th element；Order Expression rounds up；
Step004：If receiving stopping test command, Step008 is gone to step, otherwise gathers that a frame is new to be passed from imaging sensor
The double image dot image A002 sent；The gray value of the pixel of the 1st of image A002 to M rows, the 1st to Idx row is saved in
One includes in M rows, the two-dimensional array A003 of Idx column elements, i.e., to I=1,2 ..., M, J=1,2 ..., Idx, image
A002 I rows, the gray value of J row pixels are assigned to array A003 I rows, J column elements；The 1st of image A002 the
Gray value to M rows, Idx+1 to Nth column pixel is saved in a two-dimensional array comprising M rows, N-Idx column elements
In A004, i.e., to I=1,2 ..., M, J=Idx+1, Idx+2 ..., N, the gray scale of I rows, J row pixels image A002
Value is assigned to array A004 I rows, J-Idx column elements；
Step005：The numbering MI and the numbering MJ of row of row where the element for the value maximum for finding out array A003, if array
The maximum of element in A003 corresponding to multiple elements, then finds out the row where any one maximum element therein simultaneously
Numbering MI and row numbering MJ；Make i1=max (1, MI-W), i2=min (M, MI+W), j1=max (1, MJ-W), j2=
Min (Idx, MJ+W), max (X, Y) expression take the maximum among X and Y, and min (X, Y) represents to take the minimum value among X and Y, W
For integer, W represents half length of side of picture point bounding box；It is calculated as follows expression formula：
WithWherein A003 (I, J) represents the of array A003
The value of I rows, the element of J row；
Step006：The numbering MI2 and the numbering MJ2 of row of row where the element for the value maximum for finding out array A004, if array
The maximum of element in A004 corresponding to multiple elements, then finds out the row where any one maximum element therein simultaneously
Numbering MI2 and row numbering MJ2；I1=max (1, MI2-W), i2=min (M, MI2+W), j1=max (1, MJ2-W) are made,
J2=min (N-Idx, MJ2+W)；It is calculated as follows expression formula：
WithWherein A004 (I, J) represents the of array A004
The value of I rows, the element of J row；
Step007：The center-of-mass coordinate of double image point is exported to test record file using computer program, wherein the barycenter of left picture point
X coordinate be (clj-0.5)×wp, the y-coordinate of the barycenter of left picture point is (cli-0.5)×hp, the x coordinate of the barycenter of right picture point is
(crj+Idx-0.5)×wp, the y-coordinate of the barycenter of right picture point is (cri-0.5)×hp, wpRepresent the width of the pixel of imaging sensor
Degree, hpRepresent the height of the pixel of imaging sensor；OrderGo to step Step004；
Step008：Stop double image point barycenter and extract operation；
The choosing method of the value of parameter W in step Step005 and step Step006：Before the test begins, connected using computer
The double image dot image that continuous collection 80 two field picture sensors transmission comes, is operated using the image addition in Computer Image Processing,
This 80 frame double image dot image is superimposed, and obtains the picture point in a new double image dot image B001, double image dot image B001
Size can be bigger than the image spot size in the single frames double image dot image of computer acquisition；A pros are drawn on double image dot image B001
The bounding box BBOX of shape, the size for setting bounding box BBOX is can surrounding left picture point and surrounding the big of right picture point for minimum
It is small, calculate the image pixel number NP of bounding box BBOX coverings, order
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| CN102778300A (en) * | 2012-07-27 | 2012-11-14 | 中国科学院长春光学精密机械与物理研究所 | Method for stably measuring atmospheric coherence length |
| CN103578088A (en) * | 2013-11-20 | 2014-02-12 | 中国人民解放军海军大连舰艇学院 | Method for processing star image |
| CN104034353A (en) * | 2014-06-06 | 2014-09-10 | 中国科学院长春光学精密机械与物理研究所 | Computing method of digital sun sensor centroid based on detecting window |
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| US5537209A (en) * | 1994-01-14 | 1996-07-16 | Sparta, Inc. | An interferometric measuring system having temperature compensation and improved optical configurations |
| CN102778300A (en) * | 2012-07-27 | 2012-11-14 | 中国科学院长春光学精密机械与物理研究所 | Method for stably measuring atmospheric coherence length |
| CN103578088A (en) * | 2013-11-20 | 2014-02-12 | 中国人民解放军海军大连舰艇学院 | Method for processing star image |
| CN104034353A (en) * | 2014-06-06 | 2014-09-10 | 中国科学院长春光学精密机械与物理研究所 | Computing method of digital sun sensor centroid based on detecting window |
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