CN110296689A - Sweeping image Duplication test device and method in a kind of aerial imagery camera - Google Patents
Sweeping image Duplication test device and method in a kind of aerial imagery camera Download PDFInfo
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- CN110296689A CN110296689A CN201910471755.2A CN201910471755A CN110296689A CN 110296689 A CN110296689 A CN 110296689A CN 201910471755 A CN201910471755 A CN 201910471755A CN 110296689 A CN110296689 A CN 110296689A
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- aerial imagery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
Abstract
The present invention relates to a kind of test devices, and in particular to sweeping image Duplication test device and method in a kind of aerial imagery camera；It solves existing aerial imagery camera imaging Duplication test device and can not measure two or more a shooting period and take pictures a Duplication, and test process is more complex, it is easy to cause image Duplication test result error big, the technical issues of to influence image mosaic precision and splicing efficiency, even result in splicing failure.Sweeping image Duplication test device in a kind of aerial imagery camera of the invention, including pedestal, the optical platform being fixed on the base, the mounting bracket for being fixed on the base and being located above optical platform, the N number of parallel light tube being fixed on the mounting bracket, the target asterism being arranged on each focal surface of collimator tube；Aerial imagery camera is set on optical platform；Parallel light tube be arranged in mounting bracket and direction of illumination towards mounting bracket central point；The sweeping swivel point of camera is located on the central point of mounting bracket.
Description
Technical field
The present invention relates to a kind of test devices, and in particular to sweeping image Duplication test dress in a kind of aerial imagery camera
It sets and method.
Background technique
Optical imaging apparatus with the fast development and extensive use of unmanned plane during flying device, for air remote sensing imaging
In fast development, wherein be mounted on aerial remote sensing camera on unmanned plane due to can quick obtaining ground image, it is wide
It is general to be applied to the fields such as aeroplane photography, geographical mapping, environmental monitoring and disaster response.
Traditional aerial remote sensing camera is directed toward operating mode using fixed, and for focal length camera, system has higher
Resolution ratio still since optical system focal length is longer, cause camera lens single width field angle smaller, therefore, for large area
Regional imaging, it is lower that small field of view will lead to imaging efficiency, needs unmanned plane is round-trip to be repeatedly just able to achieve wide cut imaging, operating efficiency
It is low.
Aerial imagery camera by the way that by camera, sweeping is continuously taken pictures imaging within the scope of vertical course direction progress ± θ, then
Image is spliced by data post-processing software, to realize that wide cut is imaged.Since the later period needs to aerial imagery camera
The image obtained carries out the big picture image of splicing acquisition and needs to guarantee sweeping process generally according to image mosaic parameter request
In there is between adjacent two images certain Duplication, the image of different moments could be realized so seamless spliced.
It is required according to image mosaic technology, it is contemplated that distortion, visual field angle error and a place value of taking pictures for camera lens is missed
The factors such as difference, the adjacent two images Duplication for usually requiring that sweeping imaging obtains are greater than 10%.Since the Duplication is basis
The taking pictures a position of camera sweeping mechanism and determination, therefore, the ground debugging stage need precise measurement camera sweeping at
The Duplication index of picture, and an angle position of taking pictures for camera is modified.
When carrying out Duplication index actual test, overlapping region position analysis of taking pictures according to camera is needed, in overlapping region
Interior arrangement flat pattern light pipe generates asterism target and carries out Image Acquisition, then by calculating analysis light pipe culminant star point target respectively in phase
Pixel coordinate position in adjacent two images can realize that Duplication index calculates.The image that Duplication is unsatisfactory for requiring cannot
Splice for wide format images, it is therefore, accurate to measure whether Duplication index meets the requirements, it is the key that influence wide format images splicing
Factor.
Existing aerial imagery camera imaging Duplication test device can not measure more than two bats within a shooting period
According to a Duplication, and test process is more complex, is easy to cause image Duplication test result error big, to influence image mosaic
Precision and splicing efficiency, even result in splicing failure.
Summary of the invention
In order to solve existing aerial imagery camera imaging Duplication test device two can not be measured a shooting period
It takes pictures above a Duplication, and test process is more complex, is easy to cause image Duplication test result error big, thus influence diagram
As splicing precision and splicing efficiency, the technical issues of splicing failure is even resulted in, the present invention provides a kind of imagings of aviation sweeping
Duplication test device and method.
The technical solution of the invention is as follows:
Sweeping image Duplication test device in a kind of aerial imagery camera, is characterized in that
Including pedestal, the optical platform being fixed on the base, the installation for being fixed on the base and being located above optical platform
Bracket, the N number of parallel light tube being fixed on the mounting bracket, the target asterism being arranged on each focal surface of collimator tube；Target satellite
Point be denoted as respectively I1 ... IN, wherein N be >=2 integer；
Aerial imagery camera is set on the optical platform；
The focal length f1 of the parallel light tube and the focal length f2 of aerial imagery camera meet following relationship: f1 >=f2；
The top of the mounting bracket is semi-circular；The parallel light tube is arranged along the circumferential of mounting bracket in mounting bracket
Upper and direction of illumination is towards semiorbicular central point；The sweeping swivel point of the aerial imagery camera be located at it is described it is semiorbicular in
On heart point.
Further, the focal length f1 of the parallel light tube and focal length f2 of aerial imagery camera meets following relationship: f1 >=
3f2。
Further, the target asterism passes through LED illumination.
Further, the optical platform includes bottom plate and two otic placodes being fixed on bottom plate.
Meanwhile the present invention also provides a kind of test method of sweeping image Duplication in aerial camera, special characters
It is, comprising the following steps:
1) position of taking pictures for aerial imagery camera is set, the installation side in its sweeping direction Yu at least two target asterisms is made
To consistent, and meet and all target satellite points can be imaged during aerial imagery camera sweeping；
2) position of target asterism is adjusted, and observes the real-time display image of aerial imagery camera, it is ensured that each asterism point
It does not image in the overlapping region of two images；
3) control aerial imagery camera is continuously taken pictures in the sweeping position of setting, stores the image of acquisition；
4) Duplication is calculated:
4.1) Duplication A1 is surveyed according to first object asterism I1；
4.1.1 imaging point of the P1 point as first object asterism I1 on target surface) is set, it is L that target surface, which surveys pixel number,X×LY, target surface
The lower left corner is pixel origin (0,0), and the target surface upper right corner is pixel vertex (LX, LY), camera sweeping direction F is the target surface length side X
To；Pixel coordinate of the P1 dot center on image PIC1 is (X1, Y1)；Pixel coordinate of the P1 dot center on image PIC2 be
(X2, Y2)；
4.1.2 the pixel overlapping widths L1 of two images in the X direction) is calculated as follows:
L1=(LX-X1)+X2
Wherein: LXFor the X axis coordinate on pixel vertex；
LYFor the Y axis coordinate on pixel vertex；
X1The pixel X axis coordinate for being P1 dot center on image PIC1；
Y1The pixel Y axis coordinate for being P1 dot center on image PIC1；
X2The pixel X axis coordinate for being P1 dot center on image PIC2；
Y2The pixel Y axis coordinate for being P1 dot center on image PIC2；
4.1.3 the Duplication A1 of two images) is calculated as follows:
A1=L1/LX；
4.2) use step 4.1) method, successively obtain target asterism I2 ... the Duplication A2 of IN ... AN；
5) by Duplication A1, A2 ... AN is compared with design threshold respectively, if being all larger than equal to design threshold,
The sweeping direction of aerial imagery camera no longer needs to adjust at this time；If thering is any value to be less than design threshold, return step 1).
The beneficial effect of the present invention compared with prior art is:
1, the present invention installs at least two parallel light tubes, Mei Geping by mounting bracket on the path in camera sweeping direction
It is equipped with asterism target on row light pipe, the Duplication for measuring more than two Duplication of taking pictures in the period can be shot at one, is surveyed
Examination process is simple, is easily achieved, strong operability.
2, each asterism target in the present invention is imaged on two images, then is converted by picpointed coordinate position
It calculates and completes Duplication index measurement, the measuring accuracy with Pixel-level, as a result accurately and reliably.
3, the present invention can adjust the position of taking pictures during camera sweeping by Duplication calculated result, avoid because of phase
Machine sweeping obtains image Duplication and is unsatisfactory for requiring and image mosaic being caused to fail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of a specific embodiment of the invention；
Fig. 2 is the measuring and calculation schematic diagram in the embodiment；
Appended drawing reference are as follows:
1- optical platform, 101- bottom plate, 102- otic placode, 2- mounting bracket, 3- parallel light tube, 4- pedestal, 6- aerial imagery
Camera, I1- first object asterism, I2- the second target asterism.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention will be further described.
Referring to Fig.1, this test device include pedestal 4, the optical platform being fixed on pedestal 41, be fixed on pedestal 4 and
Mounting bracket 2 above optical platform 1, is arranged in parallel light tube 3 two parallel light tubes 3 being fixed in mounting bracket 2
Two target asterisms I1 and I2 on focal plane.Aerial imagery camera 6 is set on optical platform 1.Optical platform 1 includes bottom plate 101
With two otic placodes 102 being fixed on bottom plate 101.
The focal length f1 of parallel light tube 3 and the focal length f2 of aerial imagery camera 6 meet following relationship: f1 >=3f2.Mounting bracket
2 top is semi-circular.Parallel light tube 3 is arranged in mounting bracket 2 and direction of illumination is towards semi-ring along the circumferential of mounting bracket 2
The central point of shape.The sweeping swivel point of aerial imagery camera 6 is located on semiorbicular central point.Two target asterisms I1 and I2 are equal
Pass through LED illumination.
The height of optical platform 1, left-right position are adjustable, it is ensured that 6 sweeping direction F of aerial imagery camera and parallel light tube 3
Installation direction is consistent, and meeting 6 sweeping of aerial imagery camera in the process can be in different location to the asterism in two parallel light tubes 3
It is imaged.
Install parallel light tube 3 when, need in the quiescent state by aerial imagery camera 6 respectively sweeping to imaging of continuously taking pictures two
A angle adjusts the installation site of parallel light tube 3, is observed by camera image real-time display, makes the asterism of parallel light tube 3
Target is located in the overlapping region of two images.
When Duplication is tested, the target asterism in flat pattern light pipe 3 is lighted by LED illumination, adjusts illumination intensity, pass through
Camera image shows that ensuring image clearly is continuously taken pictures as it can be seen that controlling aerial imagery camera 6 in the sweeping position of setting, will
In the image recording storage to computer of camera acquisition.
Referring to Fig.1, Fig. 2:
The present invention also provides a kind of test methods of sweeping image Duplication in aerial camera, comprising the following steps:
1) sweeping that aerial imagery camera 6 is arranged is taken pictures a position, makes its sweeping direction and two target asterisms I1 and I2
Installation direction it is consistent, and meet and target asterism I1 and I2 can be imaged during 6 sweeping of aerial imagery camera；
2) position of target asterism I1 and I2 is adjusted, and observes the real-time display image of aerial imagery camera 6, it is ensured that is each
Asterism is imaged in respectively in the overlapping region of two images；
3) control aerial imagery camera 6 is continuously taken pictures in the sweeping position of setting, stores the image of acquisition；
4) Duplication is calculated:
4.1) Duplication A1 is surveyed according to first object asterism I1；
4.1.1 imaging point of the P1 point as first object asterism I1 on target surface) is set, it is L that target surface, which surveys pixel number,X×LY, target surface
The lower left corner is pixel origin (0,0), and the target surface upper right corner is pixel vertex (LX, LY), camera sweeping direction F is the target surface length side X
To；Pixel coordinate of the P1 dot center on image PIC1 is (X1, Y1)；Pixel coordinate of the P1 dot center on image PIC2 be
(X2, Y2)；
4.1.2 the pixel overlapping widths L1 of two images in the X direction) is calculated as follows:
L1=(LX-X1)+X2
Wherein: LXFor the X axis coordinate on pixel vertex；
LYFor the Y axis coordinate on pixel vertex；
X1The pixel X axis coordinate for being P1 dot center on image PIC1；
Y1The pixel Y axis coordinate for being P1 dot center on image PIC1；
X2The pixel X axis coordinate for being P1 dot center on image PIC2；
Y2The pixel Y axis coordinate for being P1 dot center on image PIC2；
4.1.3 the Duplication A1 of two images) is calculated as follows:
A1=L1/LX；
4.2) Duplication A2 is surveyed according to the second target asterism I2；
4.2.1 imaging point of the P2 point as the second target asterism on target surface) is set, it is L that target surface, which surveys pixel number,X×LY, a target surface left side
Inferior horn is pixel origin (0,0), and the target surface upper right corner is pixel vertex (LX, LY), camera sweeping direction is target surface length X-direction；P1
Pixel coordinate of the dot center on image PIC1 is (X3, Y3)；Pixel coordinate of the P1 dot center on image PIC2 is (X4, Y4)；
4.2.2 the pixel overlapping widths L2 of two images in the X direction) is calculated as follows:
L2=(LX-X3)+X4
Wherein: LXFor the X axis coordinate on pixel vertex；
LYFor the Y axis coordinate on pixel vertex；
X3The pixel X axis coordinate for being P2 dot center on image PIC1；
Y3The pixel Y axis coordinate for being P2 dot center on image PIC1；
X4The pixel X axis coordinate for being P2 dot center on image PIC2；
Y4The pixel Y axis coordinate for being P2 dot center on image PIC2；
4.2.3 the Duplication A2 of two images) is calculated as follows:
A2=L2/LX；
5) Duplication A1, A2 is compared with design threshold respectively, if being all larger than equal to design threshold, at this time aviation
The sweeping direction of image camera no longer needs to adjust；If thering is any value to be less than design threshold, return step 1).
The above description is only an embodiment of the present invention, and it is not intended to limit the protection scope of the present invention, all to utilize the present invention
Equivalent structure transformation made by specification and accompanying drawing content, is applied directly or indirectly in other relevant technical fields, and wraps
It includes in scope of patent protection of the invention.
Claims (5)
1. sweeping image Duplication test device in a kind of aerial imagery camera, it is characterised in that:
Including pedestal (4), the optical platform (1) being fixed on pedestal (4), it is fixed on pedestal (4) and is located at optical platform (1)
The mounting bracket (2) of top, is separately positioned on each parallel light tube at the N number of parallel light tube (3) being fixed on mounting bracket (2)
(3) the target asterism on focal plane；Target asterism be denoted as respectively I1 ... IN, wherein N be >=2 integer；
Aerial imagery camera (6) are set on the optical platform (1)；
The focal length f1 of the parallel light tube (3) and the focal length f2 of aerial imagery camera (6) meet following relationship: f1 >=f2；
The top of the mounting bracket (2) is semi-circular；The parallel light tube (3) is being pacified along the circumferential setting of mounting bracket (2)
It fills on bracket (2), and direction of illumination is towards semiorbicular central point；The sweeping swivel point of the aerial imagery camera (6) is located at
On the semiorbicular central point.
2. sweeping image Duplication test device in a kind of aerial imagery camera according to claim 1, it is characterised in that:
The focal length f1 of the parallel light tube (3) and the focal length f2 of aerial imagery camera (6) meet following relationship: f1 >=3f2.
3. sweeping image Duplication test device in a kind of aerial imagery camera according to claim 2, it is characterised in that:
The target asterism passes through LED illumination.
4. sweeping image Duplication test device in a kind of aerial imagery camera according to claim 3, it is characterised in that:
The optical platform (1) includes bottom plate (101) and two otic placodes (102) being fixed on bottom plate (101).
5. the test method of sweeping image Duplication in a kind of aerial camera, which comprises the following steps:
1) position of taking pictures of aerial imagery camera (6) is set, the installation side in its sweeping direction Yu at least two target asterisms is made
To consistent, and meet and all target satellite points can be imaged during aerial imagery camera (6) sweeping；
2) position of target asterism is adjusted, and observes the real-time display image of aerial imagery camera (6), it is ensured that each asterism difference
It images in the overlapping region of two images；
3) control aerial imagery camera (6) is continuously taken pictures in the sweeping position of setting, stores the image of acquisition；
4) Duplication is calculated:
4.1) Duplication A1 is surveyed according to first object asterism I1；
4.1.1 imaging point of the P1 point as first object asterism I1 on target surface) is set, it is L that target surface, which surveys pixel number,X×LY, target surface lower-left
Angle is pixel origin (0,0), and the target surface upper right corner is pixel vertex (LX, LY), camera sweeping direction F is target surface length X-direction；P1
Pixel coordinate of the dot center on image PIC1 is (X1, Y1)；Pixel coordinate of the P1 dot center on image PIC2 is (X2, Y2)；
4.1.2 the pixel overlapping widths L1 of two images in the X direction) is calculated as follows:
L1=(LX-X1)+X2
Wherein: LXFor the X axis coordinate on pixel vertex；
LYFor the Y axis coordinate on pixel vertex；
X1The pixel X axis coordinate for being P1 dot center on image PIC1；
Y1The pixel Y axis coordinate for being P1 dot center on image PIC1；
X2The pixel X axis coordinate for being P1 dot center on image PIC2；
Y2The pixel Y axis coordinate for being P1 dot center on image PIC2；
4.1.3 the Duplication A1 of two images) is calculated as follows:
A1=L1/LX；
4.2) use step 4.1) method, successively obtain target asterism I2 ... the Duplication A2 of IN ... AN；
5) by Duplication A1, A2 ... AN is compared with design threshold respectively, if being all larger than equal to design threshold, at this time
A position of taking pictures for aerial imagery camera no longer needs to adjust；If thering is any value to be less than design threshold, return step 1).
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