CN110300248A - A kind of imaging system and video camera - Google Patents
A kind of imaging system and video camera Download PDFInfo
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- CN110300248A CN110300248A CN201910628460.1A CN201910628460A CN110300248A CN 110300248 A CN110300248 A CN 110300248A CN 201910628460 A CN201910628460 A CN 201910628460A CN 110300248 A CN110300248 A CN 110300248A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 178
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000012544 monitoring process Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 13
- 230000000007 visual effect Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 7
- 238000004590 computer program Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 238000013473 artificial intelligence Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
Abstract
The invention discloses a kind of imaging system and video camera, the imaging system includes: imaging surface, camera lens and object plane；The imaging system meets following relationship: | ε | < 90 °；θ=arctan [(edge the V center-V)/(1/2*y ')]；Wherein, ε is the angle of the optical axis of the object plane and the camera lens, θ is the normal of the imaging surface and the optical axis included angle of the camera lens, the edge V is the corresponding image distance of lower edge object object distance in camera lens field range, the center V is the corresponding image distance of center-spot object object distance in camera lens field range, and y ' is imaging surface size.It is larger in the imaging system depth of field provided in an embodiment of the present invention, multiple monitored objects in field depth can blur-free imaging, therefore monitoring effect is good.It does not need to be focused each monitoring object, cost is relatively low for imaging system provided in an embodiment of the present invention.
Description
Technical field
The present invention relates to optical image technology field more particularly to a kind of imaging system and video cameras.
Background technique
Under artificial intelligence, the development of smart city, imaging system conduct is most direct, and most common information collection is set
It is standby, it is also higher and higher for the functional requirement of its intelligent recognition.It is existing due to wanting round-the-clock monitoring and carrying out relevant recognizer
The drawbacks of having imaging system often to use large aperture camera lens (typically larger than F1.6), but being brought using large aperture camera lens is exactly the depth of field
(range of blur-free imaging) is smaller.It, can only be clear in a small distance when someone or monitored object appear in the visual field
Clear imaging, from it is remote or closely will all thicken very much.
It is more when having in picture although existing imaging system can carry out blur-free imaging by the way of auto-focusing
When a monitored object, still multiple monitoring objects can not be focused simultaneously, therefore existing imaging system monitoring effect is bad,
And higher cost.
Summary of the invention
The embodiment of the invention provides a kind of imaging system and video cameras, to solve imaging system scape in the prior art
Deep small, the bad problem of monitoring effect.
The embodiment of the invention provides a kind of imaging system, the imaging system includes: imaging surface, camera lens and object plane；Institute
It states imaging system and meets following relationship:
|ε|<90°；
θ=arctan [(edge the V center-V)/(1/2*y ')]；
Wherein, ε is the angle of the optical axis of the object plane and the camera lens, and θ is the normal and the camera lens of the imaging surface
Optical axis included angle, the edge V be camera lens field range in the corresponding image distance of lower edge object object distance, the center V be camera lens visual field model
The corresponding image distance of interior center-spot object object distance is enclosed, y ' is imaging surface size.
Further, the optical axis included angle θ of the normal of the imaging surface and the camera lens meets 0 < | θ |≤10 °.
Further, the imaging surface is by around itself symmetry axis, or the symmetry axis rotation parallel with itself symmetry axis, changes
Become the normal of image planes and the optical axis included angle of the camera lens.
Further, the surrounded symmetry axis of the imaging surface rotation is remoter with itself symmetry axis, the ruler of the imaging surface
It is very little bigger.
Further, the imaging system meets following relationship:
N*p/f '=Y/L1；
N is the preset pixel quantity of recognizer, and p is the size of the pixel of imaging surface, and f ' is the focal length of camera lens, Y
For the width dimensions of center-spot object in camera lens field range, L1 is center-spot object object distance in camera lens field range.
Further, the object plane and the angle on ground are in preset angular range.
Further, the object plane is parallel to the ground.
Further, Amici prism is provided between the camera lens and imaging surface.
Further, the quantity of prismatic lens of quantity and Amici prism of the imaging surface is identical, prismatic lens and imaging surface
It corresponds.
On the other hand, the embodiment of the invention provides a kind of video camera, the video camera includes described in any of the above embodiments
Imaging system.
The embodiment of the invention provides a kind of imaging system, the imaging system includes: imaging surface, camera lens and object plane；Institute
It states imaging system and meets following relationship: | ε | < 90 °；θ=arctan [(edge the V center-V)/(1/2*y ')]；Wherein, ε is institute
The angle of the optical axis of object plane and the camera lens is stated, θ is the normal of the imaging surface and the optical axis included angle of the camera lens, and the edge V is
The corresponding image distance of lower edge object object distance in camera lens field range, the center V are center-spot object object in camera lens field range
Away from corresponding image distance, y ' is imaging surface size.
Due in embodiments of the present invention, imaging system includes imaging surface, camera lens and object plane, and imaging system meet with
Lower relational expression: | ε | < 90 °；θ=arctan [(edge the V center-V)/(1/2*y ')].Monitored object in longer distance all
Can blur-free imaging, therefore the imaging system depth of field provided in an embodiment of the present invention is larger, multiple monitored objects in field depth
Body can blur-free imaging, therefore monitoring effect is good.It does not need to be focused each monitoring object, the embodiment of the present invention provides
Imaging system cost is relatively low.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is imaging system schematic diagram provided in an embodiment of the present invention；
Fig. 2 is imaging system design schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the imaging system application schematic diagram that the embodiment of the present invention 1 provides.
Specific embodiment
The present invention will be describe below in further detail with reference to the accompanying drawings, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
All other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Fig. 1 is imaging system schematic diagram provided in an embodiment of the present invention, and new image planes shown in Fig. 1 are provided by this case
Imaging surface in imaging system, primary image plane are the imaging surface in imaging system in the prior art.New object plane is provided by this case
Imaging system in object plane, past heritage face be imaging system in the prior art in object plane.
Imaging system provided in an embodiment of the present invention meets following relationship:
|ε|<90°；
θ=arctan [(edge the V center-V)/(1/2*y ')]；
Wherein, ε is the angle of the optical axis of the object plane and the camera lens, and θ is the normal and the camera lens of the imaging surface
Optical axis included angle, the edge V be camera lens field range in the corresponding image distance of lower edge object object distance, the center V be camera lens visual field model
The corresponding image distance of interior center-spot object object distance is enclosed, y ' is imaging surface size.
As shown in Figure 1, optimal imaging object plane changes with the inclination of imaging surface after imaging surface inclination.According to Fig. 1
Imaging system schematic diagram can be seen that monitored object in longer distance can blur-free imaging, therefore the present invention is real
The imaging system depth of field for applying example offer is larger.
Preferably, the normal of the imaging surface in imaging system and the optical axis included angle θ of camera lens are full in order to further increase the depth of field
0 < of foot | θ |≤10 °.
The normal of imaging surface and the optical axis included angle θ of camera lens meet 0 < | θ | at≤10 °, object plane is parallel to the ground or is formed
Lesser angle can largely increase the depth of field of imaging system at this time.
Imaging surface in imaging system provided in an embodiment of the present invention can rotate, wherein imaging surface can be right around itself
Claim axis rotation, can also be rotated around the symmetry axis parallel with itself symmetry axis.Imaging surface by around itself symmetry axis rotate, or
It is rotated around the symmetry axis parallel with itself symmetry axis, realizes the change of the normal of imaging surface and the optical axis included angle of the camera lens.For
Mark is clear, and new image planes shown in Fig. 1 are rotated around the symmetry axis parallel with itself symmetry axis.
The surrounded symmetry axis of imaging surface rotation is remoter with itself symmetry axis, and the size that imaging surface requires is bigger, works as imaging
When rotation surrounded symmetry axis in face is itself symmetry axis, size required by imaging surface is minimum.
The imaging system also meets following relationship:
N*p/f '=Y/L1；
N is the preset pixel quantity of recognizer, and p is the size of the pixel of imaging surface, and f ' is the focal length of camera lens, Y
For the width dimensions of center-spot object in camera lens field range, L1 is center-spot object object distance in camera lens field range.
The preset pixel quantity of recognizer can be 120 pixels, 150 pixels etc., when monitored object
When shared pixel quantity reaches recognizer preset pixel quantity in the picture, monitored object can be carried out
Identification.P is the size of the pixel of imaging surface, and f ' is the focal length of camera lens, and Y is the width of center-spot object in camera lens field range
Size is spent, L1 is center-spot object object distance in camera lens field range.
Fig. 2 is imaging system design schematic diagram provided in an embodiment of the present invention, by taking Fig. 2 as an example, in camera lens field range in
The heart focuses object for the object at focus point, according to the object object distance at the width dimensions Y of the object at focus point, focus point
The size p of the pixel of L1, the preset pixel quantity n of recognizer and imaging surface, mirror can be determined by substituting into above-mentioned relation formula
Head focal length f '.Focal length setting is carried out to camera lens according to the focal length f ' determined, to accurately improve monitoring service.
Imaging system also meets relational expression θ=arctan [(edge the V center-V)/(1/2*y ')].The edge V is camera lens visual field
The corresponding image distance of lower edge object object distance in range, that is, the people shown in Fig. 2 corresponding picture in disappearance position in the camera
Away from.It should be noted that be also possible to top edges object object distance in camera lens field range corresponding for the edge V in above-mentioned formula
Image distance, that is to say, that can be people in the farthest corresponding image distance in local disappearance position.The center V is during camera lens field range is interior
The corresponding image distance of heart focusing object object distance, that is, the corresponding image distance of object at focus point.
In the embodiment of the present invention, for the angle on object plane and ground in preset angular range, which can
To be lesser angular range.Preferably, in order to make monitored object in field range can blur-free imaging, object plane can be with
Ground is parallel.By adjusting the normal of imaging surface and the optical axis included angle θ of the camera lens.It can change the angle on object plane and ground.
In addition, the quantity of the imaging surface in the embodiment of the present invention can be 1, or multiple.When in imaging system
When not set Amici prism, an imaging surface need to be only set.When being provided between camera lens and imaging surface in imaging system point
When light prism, the quantity of imaging surface is multiple, and the quantity of imaging surface is identical as the quantity of the prismatic lens of Amici prism, prism
Piece and imaging surface correspond.
Common, it include two in imaging system when Amici prism includes visible light prism and two, infrared light prism
Imaging surface, one of imaging surface is corresponding with visible light prism, for rendering visible images；Another imaging surface and infrared light
Prism is corresponding, for rendering infrared light image.
Certainly, Amici prism can also include blue light prism, green light prism etc., and the embodiment of the present invention is not in Amici prism
The quantity of prismatic lens is defined, and is not also defined certainly to the quantity of imaging surface, as long as the quantity of imaging surface and light splitting rib
The quantity of the prismatic lens of mirror is identical, and prismatic lens and imaging surface correspond.
A kind of video camera is additionally provided in the embodiment of the present invention, the video camera includes above-mentioned imaging system.
In conclusion the embodiment of the invention provides a kind of expansion depth field imaging system and video cameras, due to required observation
Object space scene it is parallel with the new object plane of imaging system or close to parallel, the object of key monitoring can be in observed scene
Picture is capable of providing broader effective blur-free imaging range on or near optimal imaging surface, and image sharpness is consistent
Property is good；It is small to automatic focusing dependence；It, can blur-free imaging, recognition efficiency be high simultaneously when more testees；It can be widely applied to
The fields such as protection and monitor field, especially recognition of face, road monitoring.
Below by a specific example, imaging system provided in an embodiment of the present invention is illustrated.
Embodiment 1:
Fig. 3 is imaging system application schematic diagram provided in an embodiment of the present invention, as shown in figure 3, setting angle is 80 °, water
When flat focal distance 10m, the monitored high 1.7m of the person, according to trigonometric function relationship, calculating mounting height is 3.46m, right
The center-spot object distance for answering camera lens is 10.15m.
According to the size pixl size=0.0029mm of the pixel of imaging surface (photosensitive element), imaging surface is empty in monitoring
Between imaging surface corresponding to middle vertical direction having a size of 4.408mm, the preset pixel quantity of face recognition algorithms is 120,
Face width 15cm, calculating lens focus are 23.548mm.
According to imaging surface in monitoring space imaging surface corresponding to vertical direction having a size of 4.408mm (vertical height
It 4.408mm) calculates, vertical field of view angle (VFOV) are as follows: 10.67 °.Object (people) object distance that disappears in the visual field that is monitored at this time is
6.64m。
Center-spot object distance is known as 10.15m, and the corresponding object distance of the object of visual field lower edge is 6.64m, to two
The picture point of object can be overlapped with imaging surface, then the difference of image distance both is equal to imaging surface needs divided by 1/2*4.408mm and inclines
The tangent value of rake angle θ, it may be assumed that
Tan θ=(edge the V center-V)/(1/2*4.408)；
V: image distance is indicated；
The center V: indicate that center-spot distance is the corresponding image distance of 10.15m；
The edge V: indicate that center-spot distance is the corresponding image distance of 6.64m；
θ: tilt angle needed for imaging surface (photosensitive element) is indicated.
According to the formula and known conditions of geometric optics, focal length and object distance, can calculate the center V is 23.603；V
Edge is 23.632.Further calculate out tan θ=(23.632-23.603)/2.204, θ=0.75 °.
At this point, focusing is all optimum image plane within the scope of from center to visual field lower edge；From center to visual field top edge range
It is interior, it focuses close to optimum image plane, therefore be capable of providing broader effective blur-free imaging range, image sharpness consistency is good.
According to the above aspect, the discovery and camera lens optical axis tilt adjustment of the imaging surface that various scenes are suitble to can be calculated
Angle, wherein preferable situation, the normal and camera lens optical axis angle theta range of imaging surface may is that 0 < | θ |≤5 °.
Specifically, rotation processing unit can be set in imaging system, when rotation processing unit receives imaging surface rotation
When instruction, according to the target angle for including in rotation command, with imaging surface itself symmetry axis or parallel with itself symmetry axis
Symmetry axis control imaging surface is rotated, so that the normal and camera lens optical axis of imaging surface are at target angle.For example, determining target
Angle theta=0.75 ° then controls imaging surface and rotates to the normal of imaging surface and camera lens optical axis into 0.75 °.
If controlling imaging surface rotation by rotary shaft of the symmetry axis parallel with itself symmetry axis, such as facial plane is imaged
Rotary shaft rotation imaging surface in one side can also translate imaging surface after turning to target angle, so that in imaging surface
Position of the heart position before adjusting where center.
In addition, the object distance mentioned in the embodiment of the present invention, focal length, mounting height, image distance, Pixel Dimensions, monitored object
A user interface can be set in minimum identification pixel quantity, pixel spot size, shooting distance and imaging surface size, by user
It inputs, can also show the normal of the imaging surface finally calculated and the angle information of optical axis on interface；It can be only aobvious on interface
Some parameters that angle information can be calculated among the above are shown, such as: it can be only image distance (marginal point and center
Point) and imaging surface size；It can also be with object distance (marginal point and central point), focal length and imaging surface size；It may also is that imaging
Face size, image distance (central point or marginal point), the object distance and focal length of corresponding marginal point or central point；And its mid-focal length is again
It can be replaced: shooting distance, Pixel Dimensions, pixel quantity and monitoring object width.
The embodiment of the invention provides a kind of imaging system and video camera, the imaging system include: imaging surface, camera lens and
Object plane；The imaging system meets following relationship: | ε | < 90 °；θ=arctan [(edge the V center-V)/(1/2*y ')]；Its
In, ε is the angle of the optical axis of the object plane and the camera lens, and θ is the normal of the imaging surface and the optical axis included angle of the camera lens,
The edge V is the corresponding image distance of lower edge object object distance in camera lens field range, and the center V is center-spot in camera lens field range
The corresponding image distance of object object distance, y ' are imaging surface size.
Due in embodiments of the present invention, imaging system includes imaging surface, camera lens and object plane, and imaging system meet with
Lower relational expression: | ε | < 90 °；θ=arctan [(edge the V center-V)/(1/2*y ')].Monitored object in longer distance all
Can blur-free imaging, therefore the imaging system depth of field provided in an embodiment of the present invention is larger, multiple monitored objects in field depth
Body can blur-free imaging, therefore monitoring effect is good.It does not need to be focused each monitoring object, the embodiment of the present invention provides
Imaging system cost is relatively low.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of imaging system, which is characterized in that the imaging system includes: imaging surface, camera lens and object plane；The imaging system
Meet following relationship:
|ε|<90°；
θ=arctan [(edge the V center-V)/(1/2*y ')]；
Wherein, ε is the angle of the optical axis of the object plane and the camera lens, and θ is the normal of the imaging surface and the light of the camera lens
Axle clamp angle, the edge V are the corresponding image distance of lower edge object object distance in camera lens field range, and the center V is in camera lens field range
The corresponding image distance of center-spot object object distance, y ' are imaging surface size.
2. imaging system as described in claim 1, which is characterized in that the optical axis of the normal of the imaging surface and the camera lens presss from both sides
Angle θ meets 0 < | θ |≤10 °.
3. imaging system as described in claim 1, which is characterized in that the imaging surface by around itself symmetry axis, or with from
The parallel symmetry axis rotation of body symmetry axis, changes the normal of imaging surface and the optical axis included angle of the camera lens.
4. imaging system as claimed in claim 3, which is characterized in that the imaging surface rotates surrounded symmetry axis and itself
Symmetry axis is remoter, and the size of the imaging surface is bigger.
5. imaging system as described in claim 1, which is characterized in that the imaging system also meets following relationship:
N*p/f '=Y/L1；
N is the preset pixel quantity of recognizer, and p is the size of the pixel of imaging surface, and f ' is the focal length of camera lens, and Y is mirror
The width dimensions of center-spot object in head field range, L1 are center-spot object object distance in camera lens field range.
6. imaging system as described in claim 1, which is characterized in that the object plane and the angle on ground are in preset angle model
In enclosing.
7. imaging system as claimed in claim 6, which is characterized in that the object plane is parallel to the ground.
8. imaging system as described in claim 1, which is characterized in that be provided with light splitting rib between the camera lens and imaging surface
Mirror.
9. imaging system as claimed in claim 8, which is characterized in that the quantity of the imaging surface and the prismatic lens of Amici prism
Quantity it is identical, prismatic lens and imaging surface correspond.
10. a kind of video camera, which is characterized in that the video camera includes imaging system described in any of the above-described claim.
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| CN111835951B (en) * | 2020-07-13 | 2022-03-25 | 杭州海康威视数字技术股份有限公司 | Adjusting method of shooting lens and shooting lens |
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