CN105676569A - Shooting system based on off-axis optical path technology and method of shooting system - Google Patents

Abstract

The invention discloses a shooting system based on an off-axis optical path technology and a method of the shooting system. An offset is set between the central axis of a target surface of a camera and a main optimal axis of an imaging object lens to form an off-axis visual angle, and a small-picture camera is combined with a large-picture prime lens; when the target surface of the camera stays in a certain position, the lens and the target surface of the camera form a first system combination; and when the target surface of the camera is controlled to rotate around the main optical axis of the object lens, the camera obtains a large imaging range in the visual field range of the lens, and a second system combination is obtained. Thus, the imaging system with two different visual field angels and two different picture occupied proportions of an object is formed, the structure is compact, the size is small, and the image definitions in the two types of parameters are the same. When the shooting system is used to shoot the object, it is not required to make the lens just face the object to find a view due to existence of the off-axis visual angle; and after installation, dead visual angle below can be reduced, and the observation range is widened.

Description

A kind of camera system and method thereof based on from axial light path technology

Technical field

The present invention relates to optical imaging field, be specifically related to a kind of based on taking the photograph from axial light path technologyPicture system.

Background technology

In optical imaging field, the imaging system that one group of image-forming objective lens and camera parameters are definite,It can imaging scope be the angle of visual field and specified distance target shared ratio in pictureExample is that target accounts for amplitude ratio and fixes. But in actual use, to captured scenery scopeOr the distance of target, ratio texts shared on picture have different requirements, for oftenPlanting different requirements just needs different object lens and the various combination pattern of video camera, and Here it is graspsThe personnel that do need constantly to change the even reason of video camera of object lens in the time of actual photographed. Replacing systemOperation comparatively complicated, in a lot of situations, after completion system assembling, also just missed shootingThe best opportunity of scenery, thus work reduced. Therefore, if can be in a kind of imaging systemRealize the combination of multiple object lens and video camera simultaneously, just can be in the situation of not changing system componentThe lower flexible switching that realizes multiple shooting effect, reduces operating procedure, ensures photographic subjects and scapeThe continuity of thing, increases work efficiency.

Optical image technology is developed so far, successively occurred multiple can be in a set of optical imagery systemIn system, realize the method for many group parameters.

1, use the earliest and what continue into the present is to adopt to have the imaging object lens of Zoom structure, logicalCross the continuous variation of objective focal length, imaging system can be switched between various combination parameter.But varifocus objective is the performance that realizes zoom, must uses complicated lens arrangement, then addUpper supporting governor motion, makes its volume and weight exceed common tight shot several times, althoughAvoided changing the step of parts, but carrying and installing of the equipment of giving brings extra burden,Restrict its application in engineering and safety-security area.

2, along with the raising of video camera number of picture elements and the progress of image processing techniques, developed outThe technology that digital picture is amplified, utilizes the resolution ratio of image superelevation, then in conjunction with multiple digital pictureThe use of algorithm can directly realize the amplification of subregion image and dwindle on picture,Thereby realize the object that changes system imaging effect. This technology is being taken the situation of single width photoUnder can obtain good actual effect. But in the time of capture video image, because video is differentiatedRate is low, and data volume is large, and is subject to the impact of image processor performance, carry out numeral amplify orIn the process of dwindling, can cause the phenomenon of image resolution ratio decline and slowed-down video, thus restrictionThe use of this technology.

Summary of the invention

For the deficiencies in the prior art, the present invention aims to provide a kind of based on from axial light path technologyCamera system, by setting skew between video camera target surface central shaft and image-forming objective lens primary optical axisAmount, has formed from axle visual angle, in conjunction with the design side of little picture video camera and large picture tight shotCase, in the time that video camera target surface rests on a certain position, camera lens and video camera target surface have formed one groupSystem in combination, when controlling video camera target surface around the rotation of object lens primary optical axis, video camera is looked at camera lensIn wild scope, just obtain a larger areas imaging, thereby obtained the second group system combination.So just form a set of imaging that the different angle of visual field of two covers and target account for amplitude ratio parameter that hasSystem, compact conformation, volume is small and exquisite, and has identical clear picture under two kinds of parametersDegree. Camera system, in the time that target is taken, owing to existing from axle visual angle, does not need simultaneouslyEquipment camera lens is just found a view to target, after installation, and the blind area under just can reducing,Improve range of observation.

To achieve these goals, the present invention adopts following technical scheme:

Based on the camera system from axial light path technology, comprise image-forming objective lens, video camera, appearanceState control structure, described image-forming objective lens, video camera, attitude control structure are in the direction of propagation of lightOn be arranged in order; Wherein, tool between video camera target surface center and the primary optical axis of image-forming objective lensHave certain for axle offset amount.

It should be noted that, described attitude control structure be connected in described video camera and control its aroundThe primary optical axis rotation of image-forming objective lens.

Further, it should be noted that, described attitude control structure comprises driving gear, fixedPosition gear, motor and gear-box, described Positioning Gear and described driving gear are located at described gearIn case, described Positioning Gear one end is connected in described video camera; Described driving gear is connected in instituteState the output shaft of motor, and engage with described Positioning Gear.

Further, it should be noted that, described Positioning Gear comprises at least two, andBe meshed with same driving gear.

Further, it should be noted that the other end place Positioning Gear of described Positioning GearRoller end fall within the set spacing hole of described gear-box.

It should be noted that, described is fixed value from axle offset amount, and target surface marginal position is cut in outwardWhen in image-forming objective lens the visual field from axle offset amount for the maximum that can arrange is from axle offset amount.

It should be noted that, the length of video camera target surface is not less than the radius of view of image-forming objective lens.

Make a method for the above-mentioned camera system based on from axial light path technology, comprise following stepRapid:

Step S1 makes image-forming objective lens, video camera, attitude control structure on the direction of propagation of lightBe arranged in order, and video camera target surface center is had from axle with respect to image-forming objective lens primary optical axisSide-play amount, to obtain the image of visual field, image-forming objective lens edge; Wherein, described from axle offset amountMaximum be target surface marginal position while being cut in the image-forming objective lens visual field outward from axle offset amount, described fromThe maximum of axle offset amount is calculated by following formula:

$d_{max}=\frac{\sqrt{4R^2-b^2}-a}{2};$

Wherein R is image-forming objective lens radius of view, and a, b are respectively the length of video camera target surface and wide,Wherein, in order to ensure the good imaging in central area, the image-forming objective lens visual field, also should meet video camera target surfaceLong a be not less than the radius of view R of image-forming objective lens, thereby ensure large as far as possible camera lens is lookedWild imaging;

A S2 video camera end face direct and Positioning Gear positions installation, Positioning GearBetween the mounting hole site of end and the rotating shaft of Positioning Gear, set from axle offset amount d, so that positioning toothWhen wheel rotation, drive video camera to circle around image-forming objective lens primary optical axis;

The all Positioning Gears of S3 engage to ensure all Positioning Gear rotations with same driving gearSynchronism, and described driving gear is connected in the output shaft of described motor; Described Positioning Gear,Driving gear is all installed in gear-box, is limited the rotation space of Positioning Gear by gear-box.

The method of work of the above-mentioned camera system based on from axial light path technology is:

By setting from axle offset amount d, make shape between video camera target surface and image-forming objective lens primary optical axisBecome from axle angle of deflection, the off-axis position silent frame imaging of video camera in the image-forming objective lens visual field,Do around image-forming objective lens primary optical axis the circumference that radius is d by attitude control structure control video cameraMotion, the direction of simultaneously controlling video camera target surface does not change in rotation process, ensures instituteThe picture of taking maintains forward all the time.

Beneficial effect of the present invention is:

First, the present invention adopts from axle technology, makes the primary optical axis of video camera target surface and image-forming objective lensBetween form certain for axle deflection angle, thereby can obtain the image of visual field, image-forming objective lens edge;Computing formula from axle angle of deflection is:

$\mathrm{\α}=\arctan \frac{d}{f^{,}};$

Wherein, d is that f ' is the focal length of image-forming objective lens from actual in axle offset amount in axial light path.

Secondly, by attitude controlling mechanism, make video camera in the image-forming objective lens visual field around key lightAxle rotation, thus the image information in whole angles of visual field of camera lens obtained, with respect to large pictureVideo camera direct imaging, has improved the resolution ratio of image in the full shot angle of visual field.

Silent frame angle of visual field computing formula is:

$\mathrm{\θ}=2\arctan \frac{R}{f^{\′}};$

Sub-picture angle of visual field computing formula is:

${\mathrm{\θ}}_{sub}=2\arctan \frac{c}{2f^{\′}};$

C is the catercorner length of video camera target surface, and R is image-forming objective lens radius of view. Wherein byIn R > c/2, thereby the angle of visual field parameter θ of long burnt end and the angle of visual field ginseng that short Jiao holds are obtainedNumber θ_sub。

Brief description of the drawings

Fig. 1 is principle of the invention schematic diagram;

Fig. 2 is system cross section structure schematic diagram in embodiment;

Fig. 3 is camera system relevant parameter index schematic diagram calculation.

Detailed description of the invention

Below with reference to accompanying drawing, the invention will be further described, it should be noted that this realityExecute example taking the technical program as prerequisite, provided detailed embodiment and concrete operating process,But protection scope of the present invention is not limited to the present embodiment.

As shown in Figure 1, a kind of camera system based on from axial light path technology, comprises image-forming objective lens1, video camera 2, attitude control structure 3, described image-forming objective lens 1, video camera 2, attitude controlStructure 3 processed is arranged in order successively on the direction of propagation of light; Wherein, the target surface of video camera 2Center and the primary optical axis of image-forming objective lens 1 between have all the time certain for axle offset amount d,To obtain the image of image-forming objective lens 1 visual field, edge; Attitude control structure 3 is connected in described shootingMachine 1 is also controlled it and is rotated around primary optical axis. In the present embodiment, described image-forming objective lens 1 adoptsPinhole lens 4 as shown in Figure 2.

As shown in Figure 2, described attitude control structure 3 also comprises driving gear 7, two locationGear 5, motor 8 and gear-box 6, described Positioning Gear 5 and described driving gear 7 are located atIn described gear-box 6, described in being connected in as location and installation face, described Positioning Gear 5 one end take the photographCamera 4, and the roller end of the other end place Positioning Gear 5 of Positioning Gear 5 falls within described toothOn roller box 6 bases in set spacing hole; Described driving gear 7 is connected in described motor 8Output shaft, and engage with described Positioning Gear 5. Adopt gear-driven project organization as appearanceState control structure, can strengthen compactness and the stability of attitude control structure.

As a kind of preferred version, when target surface marginal position is cut in the image-forming objective lens visual field outward described inBe the maximum d from axle offset amount from axle offset amount d_max。

As a kind of preferred version, the long a of the target surface of video camera 2 is not less than image-forming objective lens 1Radius of view R. Can ensure so large as far as possible to the imaging of the image-forming objective lens visual field.

Make a method for the above-mentioned camera system based on from axial light path technology, comprise following stepRapid:

Step S1 video camera target surface center has from axle inclined to one side with respect to image-forming objective lens primary optical axisThe amount of moving d, and from the maximum d of axle offset amount_max(ensure that target surface marginal position maximum can only be outwardBe cut in the image-forming objective lens visual field from axle offset amount, calculate by following formula as shown in Figure 3):

$d_{max}=\frac{\sqrt{4R^2-b^2}-a}{2};$

Wherein R is image-forming objective lens radius of view, and a, b are respectively the length of video camera target surface and wide,Wherein, in order to ensure the good imaging in central area, the image-forming objective lens visual field, also should meet video camera target surfaceLong a be not less than the radius of view R of image-forming objective lens, thereby ensure large as far as possible camera lens is lookedWild imaging;

A S2 video camera end face direct and Positioning Gear positions installation, Positioning GearBetween the mounting hole site of end and Positioning Gear rotating shaft, set from axle offset amount d, so that Positioning GearRotarily driving video camera circles around camera lens primary optical axis;

The all Positioning Gears of S3 are fixed with video camera simultaneously, and engage with same driving gearTo ensure the synchronism of all Positioning Gear rotations, and described driving gear is connected in described motorOutput shaft. This design can ensure that video camera remains that direction is not in the process of rotationBecome, thus the stability of guarantee imaging picture. Described Positioning Gear, driving gear are all installed onIn gear-box, at the bottom of the rotating shaft of described Positioning Gear other end place Positioning Gear falls into described gear-boxIn the set spacing hole of seat, limited the rotation space of Positioning Gear by gear-box.

The method of work of the above-mentioned camera system based on from axial light path technology is: by setting from axleSide-play amount d, makes to form from axle angle of deflection between video camera target surface and image-forming objective lens primary optical axis, takes the photographThe off-axis position silent frame imaging of camera in the image-forming objective lens visual field, by the control of attitude control structureVideo camera does around image-forming objective lens primary optical axis the circular motion that radius is d, controls video camera simultaneouslyThe direction of target surface does not change in rotation process, ensures that captured picture is just maintaining all the timeTo.

For a person skilled in the art, can be according to above technical scheme and design,Make various corresponding changes and distortion, and these all changes and distortion all should be included inWithin the protection domain of the claims in the present invention.

Claims (9)

1. the camera system based on from axial light path technology, is characterized in that, comprises imagingObject lens, video camera, attitude control structure, described image-forming objective lens, video camera, attitude control knotStructure is arranged in order on the direction of propagation of light; Wherein, video camera target surface center and imaging thingBetween the primary optical axis of mirror, have certain for axle offset amount.

2. the camera system based on from axial light path technology according to claim 1, its spyLevy and be, described attitude control structure is connected in described video camera and controls it around image-forming objective lensPrimary optical axis rotation.

3. the camera system based on from axial light path technology according to claim 2, its spyLevy and be, described attitude control structure comprises driving gear, Positioning Gear, motor and gear-box,Described Positioning Gear and described driving gear are located in described gear-box, described Positioning Gear one endBe connected in described video camera; Described driving gear is connected in the output shaft of described motor, and with instituteState Positioning Gear engagement.

4. the camera system based on from axial light path technology according to claim 3, its spyLevy and be, described Positioning Gear comprises at least two, and is meshed with same driving gear.

5. according to the camera system based on from axial light path technology described in claim 3 or 4,It is characterized in that, described in the roller end of the other end place Positioning Gear of described Positioning Gear falls withinIn the set spacing hole of gear-box.

6. the camera system based on from axial light path technology according to claim 1, its spyLevy and be, described is fixed value from axle offset amount, and target surface marginal position is cut in image-forming objective lens outward and looksWhen wild from axle offset amount for the maximum that can arrange is from axle offset amount.

7. the camera system based on from axial light path technology according to claim 1, its spyLevy and be, the length of video camera target surface is not less than the radius of view of image-forming objective lens.

A making as described in above-mentioned arbitrary claim based on taking the photograph from axial light path technologyThe method of picture system, is characterized in that: comprise the steps:

Step S1 makes image-forming objective lens, video camera, attitude control structure on the direction of propagation of lightBe arranged in order, and video camera target surface center is had from axle with respect to image-forming objective lens primary optical axisSide-play amount, to obtain the image of visual field, image-forming objective lens edge; Wherein, described from axle offset amountMaximum be target surface marginal position while being cut in the image-forming objective lens visual field outward from axle offset amount, described fromThe maximum of axle offset amount is calculated by following formula:

$d_{max}=\frac{\sqrt{4R^2-b^2}-a}{2};$

Wherein R is image-forming objective lens radius of view, and a, b are respectively the length of video camera target surface and wide,Wherein, in order to ensure the good imaging in central area, the image-forming objective lens visual field, also should meet video camera target surfaceLong a be not less than the radius of view R of image-forming objective lens, thereby ensure large as far as possible camera lens is lookedWild imaging;

A S2 video camera end face direct and Positioning Gear positions installation, Positioning GearBetween the mounting hole site of end and the rotating shaft of Positioning Gear, set from axle offset amount d, so that positioning toothWhen wheel rotation, drive video camera to circle around image-forming objective lens primary optical axis;

The all Positioning Gears of S3 engage to ensure all Positioning Gear rotations with same driving gearSynchronism, and described driving gear is connected in the output shaft of described motor; Described Positioning Gear,Driving gear is all installed in gear-box, is limited the rotation space of Positioning Gear by gear-box.

9. the shooting system based on from axial light path technology as described in as arbitrary in claim 1-7The method of work of system, is characterized in that, comprising:

By setting from axle offset amount d, make shape between video camera target surface and image-forming objective lens primary optical axisBecome from axle angle of deflection, the off-axis position silent frame imaging of video camera in the image-forming objective lens visual field,Do around image-forming objective lens primary optical axis the circumference that radius is d by attitude control structure control video cameraMotion, the direction of simultaneously controlling video camera target surface does not change in rotation process, ensures instituteThe picture of taking maintains forward all the time.