CN208938170U - A kind of near-infrared camera parameters scaling board - Google Patents
A kind of near-infrared camera parameters scaling board Download PDFInfo
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- CN208938170U CN208938170U CN201821103075.2U CN201821103075U CN208938170U CN 208938170 U CN208938170 U CN 208938170U CN 201821103075 U CN201821103075 U CN 201821103075U CN 208938170 U CN208938170 U CN 208938170U
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- scaling board
- camera parameters
- infrared camera
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Abstract
This patent is related to field of optical measurements, and in particular to a kind of near-infrared camera parameters scaling board.A kind of near-infrared camera parameters scaling board, including lighttight substrate are provided with array of circular apertures M × N on the substrate, ranks are vertical, which is characterized in that further include a location hole, one jiao of array of circular apertures is arranged in the location hole, is provided with reflective fabric in the circular hole in the array of circular apertures.The aluminium alloy plate that the substrate is square has certain thickness, is unlikely to deform.From the surface of substrate to from substrate back 0.01mm~0.5mm, the diameter of circular hole is from outward appearance to inner essence gradually reduced along substrate thickness direction.It is simple that this patent is designed to provide a kind of structure, easy to use, and the accuracy of manufacture is high, long service life, is capable of the passive luminous near-infrared light source scaling board of Accurate Calibration near-infrared video camera internal and external parameter.
Description
Technical field
This patent is related to field of optical measurements, and in particular to a kind of near-infrared camera parameters scaling board.
Background technique
Optical measurement and positioning application in, in measuring system the acquisition of video camera internal and external parameter directly determines measurement and
Positioning accuracy.Determine that the process of these parameters is known as camera calibration using caliberating device and scaling method, it is therefore, how smart
True calibrating camera is always research hotspot.On the one hand it is continuously improved and is improved calibration algorithm, on the other hand designs accurate mark
Fixed board.If scaling board is inaccurate, regardless of calibration algorithm, accurate calibration result cannot be all obtained.Therefore, near-infrared mark
The design accuracy of fixed board is to influence the key factor of near-infrared measuring system.The scaling board of common ordinary optical imaging system is set
Meter is fairly perfect, due to the particularity of near-infrared camera, does not receive visible light, cannot obtain common optical system calibration
The texture of plate, therefore be not available common film graph card or optical glass graph card and camera is demarcated.Two-dimensional surface mark
Earnest method has many advantages, such as that stated accuracy is higher, scaling board production is simple, calibration process is convenient, becomes current calibrating camera
Commonly used method.
Application No. is 201410144055X patents to disclose a kind of camera parameters scaling board, camera parameters calibration
Plate can either be suitable for visible light camera, can also be suitable for near-infrared video camera.It specifically includes and is provided with N × M array
The plate of circular hole is provided with the adjustable full spectral luminescence lamps and lanterns of brightness, the full spectral luminescence lamps and lanterns in the array circular hole
Inside sink into the array circular hole, the hole wall of the array circular hole has good reflective.Camera parameters scaling board tool
There are the full spectral luminescence lamps and lanterns being arranged in array circular hole.Actively luminous scaling board meeting is carried out using full spectral luminescence lamps and lanterns
The different situation of luminous intensity is generated, the circular hole size and practical scaling board circular hole size when intensity is too big, on uncalibrated image
It is not inconsistent, the position in the center of circle cannot be accurately acquired, to influences the stated accuracy of camera parameter
Summary of the invention
To solve the above problems, this patent provides a kind of stated accuracy that can improve near-infrared video camera internal and external parameter
Near-infrared camera parameters scaling board.
A kind of near-infrared camera parameters scaling board, including lighttight substrate are provided with array of circular apertures M on the substrate
× N, ranks are vertical, further include a location hole, and the location hole is arranged in one jiao of array of circular apertures, in the array of circular apertures
Reflective fabric is provided in circular hole.
A kind of near-infrared camera parameters scaling board that this patent provides, including substrate are provided with array of circular apertures M on substrate
× N, in order to demarcate conveniently, the circular hole of array of circular apertures is all evenly distributed on substrate, there is fixed distance between each circular hole.Circle
Reflective fabric is provided in hole, this patent carries out passive reflective, light source active hair at video camera using reflective fabric
Penetrate the lamp bead of infrared light.Reflective fabric is the one side for being attached to circular hole, and substrate is opaque, and the hole wall of circular hole has good reflective,
The light of reflective fabric reflection is sent out by the hole wall of circular hole.Hair can be generated by carrying out actively luminous scaling board using light-emitting lamp
The different situation of luminous intensity, when intensity is too big, the circular hole size on uncalibrated image is not inconsistent with practical scaling board circular hole size, no
The position in the center of circle can be accurately acquired, to influence the stated accuracy of camera parameter.By the way of reflective fabric, luminous intensity is suitable
In and stablize, the luminous intensity of each circular hole is uniform, avoids the problem of active light-emitting instrument is brought, and can accurately acquire the center of circle
Position, improve near-infrared video camera internal and external parameter stated accuracy.In addition, the luminous production of reflective fabric is simpler, operation
More convenient, the service life is longer.Near-infrared camera parameters are being carried out using the near-infrared camera parameters scaling board of this patent
When calibration, the angles and positions of scaling board are converted, is remain stationary after transformation every time, caliberating device is shot by video camera, shot
Enough photos after the completion of uncalibrated image shooting, need to extract the characteristic point on scaling board first.The center of circular hole can be used as
Characteristic point.On scaling board image, according to four angle points in the prompt click feature point region clockwise of identification point,
Four angle points are the center of four circular holes on four angles of round matrix.Then it is extracted in the enclosed region of four angle points special
Levy the subpixel coordinates of point and by centainly regularly arranged.In above process, the click sequence of four angle points is to guarantee image
The arrangement position of upper characteristic point matrix and the consistent key of characteristic point matrix of scaling board template.Therefore this patent substrate further includes one
A location hole, four angles which is used to constitute M × N number of point round matrix are ranked up, close that of location hole
The center of circular hole is first angle point, four thus apparent then along successively determining subsequent angle point clockwise
The click sequence of angle point.
Further, circular hole includes round platform hole and cylindrical hole, and the starting point of round platform hole is in substrate front side, the hole of round platform hole
Diameter is gradually reduced along substrate thickness direction, and the end of round platform hole is identical as the connection of the starting point of cylindrical hole and aperture, cylindrical hole
Aperture it is constant, on substrate back, the end of the cylindrical hole is provided with reflective fabric for the end of cylindrical hole.This patent devises
The circular hole of the special shape of round platform hole and cylindrical hole one.Compared with common cylindrical circular hole, when under a different angle into
When row shooting, the circular hole of this patent will not be blocked the luminous point of circular hole, while round platform hole energy maximum limit by the thickness of substrate itself
Degree ground transmitting infrared light.
Further, the range of the cylinder hole depth is 0.01mm to 0.5mm, the diameter range of cylindrical hole be 3mm extremely
5mm.Cylinder hole depth should be the smaller the better, but is limited by technique, still there is a little thickness.The diameter of cylindrical hole is also equal to justify
The diameter of platform bore end, so the requirement to the diameter of cylindrical hole is very stringent.In order to make video camera shoot picture clearly with mention
High camera parameters stated accuracy, the diameter of cylindrical hole is preferably in 3mm between 5mm.
Further, plane angulation where forming the bevel edge and substrate of the round platform hole is 25 ° to 35 °.This
In angular range, round platform hole emits infrared light to the maximum extent.
Further, the value range of M=N, N are more than or equal to 5, and the ranks of array of circular apertures are respectively parallel to substrate
Edge, the distance range between adjacent circular holes are 2cm to 4cm.The square array of circular hole substantially, and ranks are put down respectively
Row is 2cm to 4cm in the distance between circular hole each on the edge of substrate, substrate range, and the distance between hole is all by higher
The measuring instrument of precision is determined.
Further, the material of the substrate is aluminium alloy.Substrate is with certain thickness, on-deformable aluminium alloy
Plate, it is ensured that the circular hole on aluminium alloy plate is in same plane, being capable of Accurate Calibration near-infrared video camera internal and external parameter.Due to adopting
With aluminium alloy plate, therefore the hole wall reflective of circular hole is preferable.
Further, the surface of the substrate is through peroxidating.The surface of the aluminium alloy plate carries out oxygen by chemical method
Change, avoids reflective.
Further, the thickness range of the substrate is 4mm to 7mm.The thickness of substrate cannot be too small, too small thickness drop
The intensity of low substrate, substrate are easily deformed, and cannot ensure that the circular hole on aluminium alloy plate is in same plane, to influence calibration
Accuracy；The thickness of substrate can not be excessive, when being shot under a different angle, thickness that circular hole can be excessive by substrate
Block the luminous point of circular hole.
Further, it is the arc-shaped of 1cm that four angles of the substrate, which are radius, avoids sharp, facilitates storage and hand-held.
The beneficial effect of this patent is, carries out using reflective fabric passive reflective, and light source is at video camera
Actively emit the lamp bead of infrared light.The different feelings of luminous intensity can be generated by carrying out actively luminous scaling board using light-emitting lamp
Condition, when intensity is too big, the circular hole size on uncalibrated image is not inconsistent with practical scaling board circular hole size, cannot accurately acquire circle
The position of the heart, to influence the stated accuracy of camera parameter.By the way of reflective fabric, luminous intensity is moderate and stablizes, each
The luminous intensity of circular hole is uniform, avoids the problem of active light-emitting instrument is brought, and can accurately acquire the position in the center of circle, improves close
The stated accuracy of thermal camera internal and external parameter.In addition, the luminous production of reflective fabric is simpler, more convenient operation uses the longevity
It orders longer.The circular hole of the special shape of round platform hole and cylindrical hole one has also been devised in this patent.When carrying out under a different angle
When shooting, the circular hole of this patent will not be blocked the luminous point of circular hole by the thickness of substrate itself, while round platform hole can be to greatest extent
Ground emits infrared light.Substrate is with certain thickness, on-deformable aluminium alloy plate, it is ensured that the circular hole on aluminium alloy plate is in
Same plane, being capable of Accurate Calibration near-infrared video camera internal and external parameter.
Detailed description of the invention
Fig. 1 is the structure chart of this patent near-infrared camera parameters scaling board.
Fig. 2 is the sectional view of circular hole.
Fig. 3 is the main view of a certain embodiment of this patent near-infrared camera parameters scaling board.
Fig. 4 is image of this patent near-infrared camera parameters scaling board in near-infrared video camera.
It include substrate 1, circular hole 2, round platform hole 21, cylindrical hole 22, location hole 3, reflective fabric 4 in figure.
Specific embodiment
This patent scheme is further described below in conjunction with attached drawing.
As shown in Figure 1, a kind of near-infrared camera parameters scaling board, including lighttight substrate 1, set on the substrate 1
It is equipped with array of circular apertures M × N, it further includes a location hole 3 that ranks are vertical, and one jiao of array of circular apertures is arranged in the location hole 3,
Reflective fabric 4 is provided in circular hole 2 in the array of circular apertures.
A kind of near-infrared camera parameters scaling board that this patent provides, including substrate 1 are provided with array of circular apertures on substrate
M × N, in order to demarcate conveniently, the circular hole 2 of array of circular apertures is all evenly distributed on substrate, have between each circular hole 2 it is fixed away from
From.It is provided with reflective fabric 4 in circular hole 2, this patent carries out passive reflective using reflective fabric 4, and light source is from video camera
Place actively emits the lamp bead of infrared light.Reflective fabric 4 is the one side for being attached to circular hole, and substrate 1 is opaque, and the hole wall of circular hole 2 has good
Good reflective, the light that reflective fabric 4 reflects are sent out by the hole wall of circular hole 2.Carry out what active shone using light-emitting lamp
Scaling board can generate the different situation of luminous intensity, the circular hole size and practical scaling board when intensity is too big, on uncalibrated image
Circular hole size is not inconsistent, and cannot accurately acquire the position in the center of circle, to influence the stated accuracy of camera parameter.Using reflective fabric 4
Mode, luminous intensity it is moderate and stablize, the luminous intensity of each circular hole 2 is uniform, avoids active light-emitting instrument bring and asks
Topic can accurately acquire the position in the center of circle, improve the stated accuracy of near-infrared video camera internal and external parameter.In addition, reflective fabric
Luminous production is simpler, and more convenient operation, the service life is longer.
The form of the scaling board of video camera is varied, wherein round calibration is that effect is optimal.Because circle is to image
Threshold value it is insensitive, and characteristic point coordinate be easy determine, it is possible to be relatively easy to obtain the stated accuracy of sub-pixel.Circle
Shape scaling board is the evenly distributed circular hole of the same size on surface plate, and the center between circular hole is away from accurately known, in circular hole
The heart can be used as characteristic point.Because of more not special circular hole, it is difficult to automatically determine space coordinates coordinate origin.It is demarcating
When, generally manually to choose calibration range and coordinate origin on the image, a kind of method that automatic Calibration may be implemented be with
Center of circular hole on scaling board edge establishes coordinate system as origin.
When the near-infrared camera parameters scaling board using this patent carries out the calibration of near-infrared camera parameters, transformation mark
The angles and positions of fixed board remain stationary after transformation every time, shoot caliberating device by video camera, shoot enough photos,
After the completion of uncalibrated image shooting, need to extract the characteristic point on scaling board first.The center of circular hole 2 can be used as characteristic point.It is marking
On fixed board image, according to four angle points for prompting click feature point region clockwise of identification point, four angle points are
For the center of four circular holes 2 on four angles of round matrix.Then the Asia of characteristic point is extracted in the enclosed region of four angle points
Pixel coordinate simultaneously presses centainly regularly arranged.In above process, the click sequence of four angle points is to guarantee characteristic point on image
The arrangement position of matrix and the consistent key of characteristic point matrix of scaling board template.Therefore this patent substrate further includes a location hole
3, which is used to be ranked up four angles that M × N number of point constitutes round matrix, that close circular hole of location hole 3
Center is first angle point, then along successively determining subsequent angle point clockwise, thus apparent four angle points
Click sequence.
As shown in Fig. 2, circular hole 2 includes round platform hole 21 and cylindrical hole 22, the starting point of round platform hole 21 on 1 front of substrate,
The aperture of round platform hole 21 is gradually reduced along 1 thickness direction of substrate, and the end of round platform hole 21 is connect with the starting point of cylindrical hole 22
And aperture is identical, the aperture of cylindrical hole 22 is constant, and the end of cylindrical hole 22 is on 1 back side of substrate, the end of the cylindrical hole 22
It is provided with reflective fabric.This patent devises the circular hole 2 of the special shape of 22 one of round platform hole 21 and cylindrical hole.With common cylinder
Shape circular hole is compared, and when being shot under a different angle, the circular hole 2 of this patent will not block circle by the thickness of substrate itself
The luminous point in hole 2, while round platform hole 21 can emit infrared light to the maximum extent.Preferably, the range of the cylinder hole depth h is
0.01mm to 0.5mm, the diameter l range of cylindrical hole are 3mm to 5mm.Cylinder hole depth should be the smaller the better, but by the limit of technique
System, still there is a little thickness.The diameter of cylindrical hole is also equal to the diameter of rotary table bore end, so the requirement of the diameter to cylindrical hole
It is very stringent.In order to shoot video camera picture clearly with improve camera parameters stated accuracy, the diameter l of cylindrical hole preferably exists
3mm is between 5mm.The bevel edge and 1 place plane angulation α of substrate for forming the round platform hole 21 are 25 ° to 35 °.This
In angular range, round platform hole 21 emits infrared light to the maximum extent.
Fig. 3 is the front view of some embodiment, and substrate 1 shown in Fig. 3 is the square of side length a, it is preferred that a=
30cm, it is the arc-shaped of 1cm that four angles of the substrate 1, which are radius c, avoids sharp, facilitates storage and hand-held.M=N=in figure
7, the array of " 1+7*7 " is presented in first dot, 2 left side in anchor point 3, it is preferable that the value range of M=N, N be greater than or
Equal to 5, the ranks of array of circular apertures are respectively parallel to the edge of substrate 1, and the distance d range between adjacent circular holes is 2cm to 4cm.It is fixed
Distance of the position hole apart from the adjacent both sides of substrate is b, it is preferable that b 4.5cm.The square array of circular hole 2 on substrate 1, and
And ranks are respectively parallel to the edge of substrate, the distance between hole is all determined by the measuring instrument of higher precision.Make
When carrying out the calibration of near-infrared camera parameters with the near-infrared camera parameters scaling board of the embodiment, the angle of scaling board is converted
And position, it is remain stationary after transformation every time, the image by video camera shooting scaling board is as shown in Figure 4.
Preferably, the material of the substrate 1 is aluminium alloy.Substrate 1 is with certain thickness, on-deformable aluminium alloy
Plate, it is ensured that the circular hole 2 on aluminium alloy plate is in same plane, being capable of Accurate Calibration near-infrared video camera internal and external parameter.Due to
Using aluminium alloy plate, therefore the hole wall reflective of circular hole is preferable.Through peroxidating, the method for oxidation can be on the surface of the substrate 1
It is chemical method, the substrate surface after oxidation can be to avoid reflective.The substrate 1 is 4mm to 7mm with a thickness of range.Substrate 1
Thickness cannot be too small, too small thickness reduces the intensity of substrate 1, and substrate 1 is easily deformed, and cannot ensure the circle on aluminium alloy plate
Hole is in same plane, to influence the accuracy of calibration；The thickness of substrate 1 can not be excessive, when under a different angle into
When row shooting, circular hole can be blocked the luminous point of circular hole by the excessive thickness of substrate 1.
This patent carries out passive reflective using reflective fabric 4, and light source actively emits infrared light at video camera
Lamp bead.The different situation of luminous intensity can be generated by carrying out actively luminous scaling board using light-emitting lamp, when intensity is too big,
Circular hole size on uncalibrated image is not inconsistent with practical scaling board circular hole size, the position in the center of circle cannot be accurately acquired, thus shadow
Ring the stated accuracy of camera parameter.By the way of reflective fabric 4, luminous intensity is moderate and stablizes, the luminous intensity of each circular hole
Uniformly, the problem of active light-emitting instrument is brought is avoided, the position in the center of circle can be accurately acquired, is improved inside and outside near-infrared video camera
The stated accuracy of portion's parameter.In addition, the luminous production of reflective fabric is simpler, more convenient operation, the service life is longer.This patent is also
Devise the circular hole 2 of the special shape of 22 one of round platform hole 21 and cylindrical hole.When being shot under a different angle, this is specially
The circular hole 2 of benefit will not be blocked the luminous point of circular hole by the thickness of substrate 1 itself, at the same round platform hole 21 can emit to the maximum extent it is red
Outer light.
Substrate 1 is with certain thickness, on-deformable aluminium alloy plate, it is ensured that the circular hole 2 on aluminium alloy plate is in same
One plane, being capable of Accurate Calibration near-infrared video camera internal and external parameter.
Claims (8)
1. a kind of near-infrared camera parameters scaling board, including lighttight substrate, be provided on the substrate array of circular apertures M ×
N, ranks are vertical, which is characterized in that further include a location hole, one jiao of array of circular apertures, the circle is arranged in the location hole
Reflective fabric is provided in circular hole in hole array.
2. a kind of near-infrared camera parameters scaling board according to claim 1, which is characterized in that circular hole includes round platform hole
With cylindrical hole, the starting point of round platform hole is in substrate front side, and the aperture of round platform hole is gradually reduced along substrate thickness direction, rotary table
The end in hole is identical as the connection of the starting point of cylindrical hole and aperture, and the aperture of cylindrical hole is constant, and the end of cylindrical hole is carried on the back in substrate
On face, the end of the cylindrical hole is provided with reflective fabric.
3. a kind of near-infrared camera parameters scaling board according to claim 2, which is characterized in that the cylinder hole depth
Range be 0.01mm to 0.5mm, the diameter range of cylindrical hole is 3mm to 5mm.
4. a kind of near-infrared camera parameters scaling board according to claim 2, which is characterized in that form the round platform hole
Bevel edge and substrate where plane angulation be 25 ° to 35 °.
5. a kind of near-infrared camera parameters scaling board according to claim 1, which is characterized in that the value model of M=N, N
It encloses for more than or equal to 5, the ranks of array of circular apertures are respectively parallel to the edge of substrate, the distance range between adjacent circular holes is 2cm
To 4cm.
6. a kind of near-infrared camera parameters scaling board according to claim 1, which is characterized in that the material of the substrate
For aluminium alloy.
7. a kind of near-infrared camera parameters scaling board according to claim 1, which is characterized in that the thickness of the substrate
Range is 4mm to 7mm.
8. a kind of near-infrared camera parameters scaling board according to claim 1, which is characterized in that four of the substrate
Angle is that radius is the arc-shaped of 1cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821103075.2U CN208938170U (en) | 2018-07-12 | 2018-07-12 | A kind of near-infrared camera parameters scaling board |
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| CN201821103075.2U CN208938170U (en) | 2018-07-12 | 2018-07-12 | A kind of near-infrared camera parameters scaling board |
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| CN208938170U true CN208938170U (en) | 2019-06-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108648243A (en) * | 2018-07-12 | 2018-10-12 | 广东省医疗器械质量监督检验所 | A kind of near-infrared camera parameters scaling board |
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2018
- 2018-07-12 CN CN201821103075.2U patent/CN208938170U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108648243A (en) * | 2018-07-12 | 2018-10-12 | 广东省医疗器械质量监督检验所 | A kind of near-infrared camera parameters scaling board |
| CN108648243B (en) * | 2018-07-12 | 2024-03-26 | 广东省医疗器械质量监督检验所 | Near infrared camera parameter calibration board |
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