CN201667683U - Large focal variation ratio automatic focusing all-in-one video camera - Google Patents
Large focal variation ratio automatic focusing all-in-one video camera Download PDFInfo
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- CN201667683U CN201667683U CN2010201453415U CN201020145341U CN201667683U CN 201667683 U CN201667683 U CN 201667683U CN 2010201453415 U CN2010201453415 U CN 2010201453415U CN 201020145341 U CN201020145341 U CN 201020145341U CN 201667683 U CN201667683 U CN 201667683U
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Abstract
The utility model relates to a large focal variation ratio automatic focusing all-in-one video camera, belonging to the optical, mechanical and electric all-in-one technical field, comprising an optical system, an automatic focusing system, a video driving system and a shell. The automatic focusing is realized using a contrast detection method and the image signal is collected, processed, calculated and compared by the control signal sent from a processor 108 of the automatic focusing system and the process signal is sent out to control a step motor 111 and a compensation group G4 of the optical system 101 is driven to move to the focusing position, thus the video camera automatically focuses. When the video camera automatically focuses, an auxiliary light source is not needed and the video camera is free from the effect of object distance and the focusing process uses a microcontroller to control and the time is compact and also has a video drive to automatically adjust the aperture according to the environment, thus the video camera accurately, quickly automatically focuses at light, dark, far and near environments and the image is undistorted and the video camera is widely applied on the fields such as the highway, the airfield, the finance, the military and the harbor.
Description
Technical field
The utility model belongs to the optical, mechanical and electronic integration field, relates to a kind of integrated camera that is used for protection and monitor field, and especially a kind of have big zoom ratio and can self-focusing integrated camera in zooming range.
Background technology
Along with the development of domestic and international security protection industry, people are to the increasingly stringent that requires of security product.Usually the domestic and international monitoring camera lens of producing comprises zoom lens and tight shot in the security protection industry, wherein all straight performance and the technical merits thereof that influence product of pressing such as automaticity of the controllability of zoom lens zooming range size, focal length adjustment and lens aperture control.At present both at home and abroad the monitoring zoom lens of producing mainly contains two kinds of manual zoom and power zooms.Manually zoom lens is contained in inconvenience when using on the video camera, can't realize the controllability that focal length is adjusted, and generally its focal length section is also less; Power zoom can be realized the controllability of focal length on certain degree, but owing to will lean on motor-driven, so its volume is bigger, automaticity is not high enough simultaneously, when camera lens (as mechanical shock, wearing and tearing, distortion, loosening etc.) and when making imaging focal plane depart from CCD for some reason, just can't blur-free imaging.This just limited these products such as highway, airport, financial field, military affairs, harbour etc. to the use in the demanding important industry of monitoring camera lens automation.Use the automatic focus technology all-in-one volume of the same focal length section is greatly reduced, and improve the automaticity of all-in-one greatly.But because the automatic focus technical sophistication, require high, difficulty is big, become the bottleneck of the domestic all-in-one development of restriction always, for satisfying instructions for use, the automatic focusing integrated camera that key areas such as present domestic highway, airport, financial field, military affairs, harbour mainly use Japan to make.If can independently research and develop the automatic focus all-in-one, then can fill up domestic blank in automatic focusing integrated camera lens field, capture certain market share, import substitutes.
Summary of the invention
The purpose of this utility model provide a kind of have 16 times of big zoom ratio abilities, in whole zoom process, can realize self-focusing integrated camera.
The utility model purpose is achieved by the following technical solution: a kind of large-zoom ratio automatic focusing integrated camera, form by optical system, autofocus system, video frequency driving system and casing thereof.It is self-focusing that wherein autofocus system is based on the realization of Contrast Detection method, comprises CCD 102, amplifier 105, filter 106, A/D conversion chip 107, processor 108, control card 109, driver 110 and stepping motor 111.When optical system 101 fails that subject focused on CCD 102 target surfaces, processor 108 sends control signal, the IMAQ that control CCD 102 transmits optical system also is converted into analog signal, by amplifier 105 it is carried out processing and amplifying, through filter 106 filtering and to reach A/D conversion chip 107 be digital voltage signal with this analog signal conversion, reach at last in the processor 108 again.Processor 108 calculates a focal length evaluation of estimate according to the focal length evaluation function to the signal that transmits.Processor 108 sends and controls signal to control card 109 then, and control card 109 sends electric pulse Control Driver 110, thus control step motor 111, and the compensation group G4 that drives optical system 101 moves with the step pitch of determining, the image planes position is changed.Send signal by processor 108 again, the acquisition process picture signal also calculates second focal length evaluation of estimate, and processor 108 compares the direction of motion of determining stepping motor 111 to former and later two evaluations of estimate.Stepping motor 111 drives compensation group G4 according to the direction of determining with the step pitch of determining again and moves, whenever moving a step pitch just calculates an evaluation of estimate and compares the direction of motion of determining stepping motor 111 with previous evaluation of estimate, by ceaselessly gathering, calculate, comparing, up to the maximum that finds the focal length evaluation of estimate, focus on and finish, can see clearly imaging with the vision signal that display 112 receiving processors 108 transmit this moment.Optical system comprises that the preceding fixedly group G1 of positive light coke, the change of negative power doubly organize the back fixedly group G3 of G2, positive light coke and the compensation group G4 of positive light coke.During use, preceding fixing group G1 and back are fixed group G3 and are maintained static, doubly organize the zoom that G2 realizes 6-96mm by mobile change, compensate the variation of image planes position behind the zoom again by motion compensation group G4, guarantee that the position of image planes in whole zooming range can immobilize.Video frequency driving system mainly comprises drive circuit 103 and micromachine 104, the size of the analog electrical signal that transmits according to CCD 102, by drive circuit output one control voltage control micromachine, adjust aperture size, the vision signal of video camera output is remained in the selected fiduciary level scope of video.
Because the utility model adopts the Contrast Detection method to realize automatic focus, do not need secondary light source during automatic focus, be not subjected to the influence of target distance, and processor 108 cooperates compactness in the whole focusing process with stepping motor 111, does not lose time, and the utility model adopts video drive simultaneously, can regulate aperture automatically according to environment, therefore the utility model can be bright, dark what allow, far away, automatic focus accurately and rapidly in the near-ambient scope, and image is undistorted.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model, comprises optical system, autofocus system, video frequency driving system;
Fig. 2 is a structural representation of the present utility model;
Fig. 3 is the automatic focus flow chart;
Fig. 4 is an optical system Lens assembly structure chart, and G2, back fixing group G3 and compensation group G4 are doubly organized in fixing group G1, change before comprising;
Fig. 5 is the optical system installation diagram.
Embodiment
As shown in Figure 2, the utility model mainly comprises optical system 201, autofocus system, video frequency driving system 203 and casing 207 thereof.Autofocus system comprises amplifier, filter, A/D conversion chip, processor, control card, driver, stepping motor 204 and CCD 205, and wherein amplifier, filter, A/D conversion chip, processor, control card, driver are integrated on the optical system circuit board 202 all around.The utility model is equipped with circuit board 206 in addition, and the picture signal that processor can be transmitted is handled, and finally the mode with the screen signal passes on the display by video line 208.This machine is contained on the control point, after the energized, can carries out the monitoring work of fixed-direction; Also this machine core can be contained on the clipping the ball, and be equipped with infrared lamp, can realize comprehensive, round-the-clock monitoring work, satisfy the instructions for use of key areas such as highway, airport, finance, military affairs, harbour.
As shown in Figure 1, when described integrated camera begins zoom, processor 108 sends the change of control signal control optical system 101 and doubly organizes G2 moves to correspondence according to required focal length position, moving of G2 also doubly organized because of becoming in the position of image planes simultaneously, makes imaging clearly originally fog.And then auto-focus function starts, send signal to CCD 102 by processor 108, analog signal is gathered and be converted into to 102 pairs of picture signals of CCD, then this signal is reached amplifier 105 processing and amplifying, carry out Filtering Processing through filter 106 again, with the The noise that reduces to sample, quantizes, the disturbance of environment produces in transmission and the image acquisition process in image.Subsequently signal is reached A/D conversion chip 107, be digital voltage signal with analog signal conversion and reach in the processor 108.Processor 108 calculates a focal length evaluation of estimate with the signal substitution focal length evaluation function that transmits, send again and control signal to control card 109, control card 109 sends electric pulse to driver 110,111 motions of control step motor, the compensation group G4 that drives optical lens 101 moves forward a step pitch, send signal by processor 108 again, gather second image and calculate corresponding focal length evaluation of estimate.Two focal length evaluations of estimate that processor 108 will obtain compare, analyze, and determine the direction of motion of stepping motor 111, send control signal then, and drive stepping motor 111 is moved by the direction of determining with the step pitch of determining.Compensation group G4 whenever moves a step pitch processor 108 and just controls CCD 102 images acquired, and picture signal handled, calculates, compare, analyze by working as front focal length evaluation of estimate and previous value, determine the moving direction of next step stepping motor, and judge whether current evaluation of estimate is maximum.By ceaselessly gathering, comparing, make the focal length evaluation of estimate reach peaked position up to finding, illustrate that subject has focused on the CCD target surface, display 112 will reappear picture clearly this moment, processor 108 can send signal, stops to focus on action, focuses on and finishes.
When the brightness of described integrated camera environment of living in changes, the image analoging signal that CCD 102 gathers and transforms will change, analog signal and standard value after drive circuit 103 will change compare, according to 104 motions of a control of comparative result output voltage control micromachine, thereby adjustment aperture size, the vision signal of video camera output is remained in the selected fiduciary level scope of video, guarantee that the image of output on display is undistorted.
As shown in Figure 3, the utility model adopts the Contrast Detection method to realize automatic focus.By step 301 and step 302 pair image signal's collection, amplification, filtering, A/D conversion process, the final image signal is converted in the digital voltage signal input processor 208.In step 303,108 pairs of digital voltage signals that transmit of processor are understood, are added up, determine each pixel intensity signal magnitude on the CCD 102, again according to focal length evaluation function: F (i)=∑ | fi (x, y)-fi (x, y-1) |+| fi (x, y)-fi (x-1, y) | calculate focal length evaluation of estimate F (i).This focal length evaluation function represents that CCD goes up the absolute value sum of neighbor luminance signal difference, i=0 wherein, 1,2,3 ..., i the focal length evaluation of estimate that processor calculates during expression automatic focus, the focal length evaluation of estimate that processor calculated when the compensation group G4 of F (0) expression optical system was not mobile, (x y) is illustrated in capable, the y row pixel intensity signal value of x on the CCD 102 to fi.In step 304, processor 108 is made comparisons the focal length evaluation of estimate F (i) of current calculating with previous evaluation of estimate F (i-1), if F (i)＞F (i-1), processor sends control signal, the control compensation group is moved by original direction, and gathers new picture signal, calculates new evaluation of estimate.When F (1)＜F (0), processor 108 sends control signal, and control compensation group G4 is by opposite direction motion, and gathers Next picture signal, calculates new evaluation of estimate.G4 moves to certain position when the compensation group, make F (i)＞F (i-1) and F (i+1)＜F (i), processor 108 sends control signal, control compensation group G4 continues by the original direction step pitch of advancing, and calculate F (i+2), if F (i+2)＞F (i+1) illustrates that processor 108 sends control signal and compensation group G4 is moved forward and calculates new evaluation of estimate and analyze comparison; If F (i+2)＜F (i+1) illustrates that F (i) reaches maximum, processor 108 sends control signal, and the compensation group is moved to the position of F (i) just now, and stops to focus on action, and optical system is finished focusing.
As shown in Figure 4, described optical system comprises that the preceding fixedly group G1 of positive light coke, the change of negative power doubly organize the back fixedly group G3 of G2, positive light coke and the compensation group G4 of positive light coke.As shown in Figure 5, when fixing len, eyeglass is clipped in the corresponding mould in order, by plastic transfer molding machine the assembly die casting of fixing len is come out then, eyeglass is fixed on the corresponding assembly.Wherein, preceding fixing G1 of group and back are fixed group G3 and are fixed on the preceding arrangement of mirrors tube 501, change is doubly organized G2 and is fixed on the doubly mobile seat 502 of change, compensation group G4 is fixed on compensation and moves on the seat 505, and become doubly move seat 502 and compensation move seat 505 all be contained in two with optical axis parallel guide rod 503 on, they can slide along guide rod 503 front and back.During use, drive to become by stepping motor and doubly to move seat 502 and move, doubly organize G2 and move, realize the zoom of 6-96mm at preceding arrangement of mirrors tube 501 thereby drive to become; Drive compensation by stepping motor and move seat 505 and move, thus drive compensation group G4 back arrangement of mirrors tube 506 move compensate zoom after the variation of image planes position, guarantee that the position of image planes in whole zooming range can immobilize.
Claims (2)
1. large-zoom ratio automatic focusing integrated camera, comprise optical system, autofocus system, screen drive system and casing thereof, the IMAQ that the CCD102 that it is characterized in that video camera transmits optical system 101 also is converted into analog signal, by autofocus system the analog signal that transforms is amplified, filtering, A/D conversion, calculated, relatively, provide feedback signal control step motor 111 drive optical system compensation group G4 again and do corresponding mobile, make integrated camera automatic focus; By video frequency driving system analog signal and standard value are compared,, adjust aperture size, the vision signal of video camera output is remained in the selected fiduciary level scope of video according to a control of comparative result output voltage control micromachine 104.
2. a kind of large-zoom ratio automatic focusing integrated camera according to claim 1, it is characterized in that described autofocus system comprises CCD102, amplifier 105, filter 106, A/D conversion chip 107, processor 108, control card 109, driver 110 and stepping motor 111, send control signal control CCD102 images acquired signal and be translated into analog signal by processor 108, carrying out amplification filtering by amplifier 105 and 106 pairs of analog signals of filter again handles, after process A/D conversion chip 107 is converted to digital voltage signal, reach processor 108, calculate by 108 pairs of digital voltage signals that transmit of processor, draw the focal length evaluation of estimate and compare with previous evaluation of estimate, determine the direction of motion of stepping motor 111, send the compensation group G4 motion of control signal control optical system 101 again, gather new picture signal, by ceaselessly gathering, calculate, the movement images signal, providing feedback signal control compensation group G4 moves, up to the maximum that finds the focal length evaluation of estimate, optical system is finished focusing, processor 108 sends control signal, stops to focus on action.
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| CN2010201453415U CN201667683U (en) | 2010-03-31 | 2010-03-31 | Large focal variation ratio automatic focusing all-in-one video camera |
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| CN2010201453415U CN201667683U (en) | 2010-03-31 | 2010-03-31 | Large focal variation ratio automatic focusing all-in-one video camera |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867705A (en) * | 2010-03-31 | 2010-10-20 | 福州开发区鸿发光电子技术有限公司 | Large-zoom ratio automatic focusing integrated camera |
| CN102830489A (en) * | 2011-12-17 | 2012-12-19 | 中国航空工业集团公司洛阳电光设备研究所 | Device and method for compensating depth of field of rotational variable multiple optical system |
| CN103728813A (en) * | 2012-10-15 | 2014-04-16 | 浙江大华技术股份有限公司 | Method for synchronizing focusing operation and zooming operation |
| CN103916584A (en) * | 2013-01-04 | 2014-07-09 | 齐发光电股份有限公司 | Image acquisition system |
| CN104954680A (en) * | 2015-06-16 | 2015-09-30 | 深圳市金立通信设备有限公司 | Camera focusing method and terminal |
| CN107170239A (en) * | 2017-06-30 | 2017-09-15 | 广东工业大学 | A kind of target vehicle follows the trail of grasp shoot method and device |
-
2010
- 2010-03-31 CN CN2010201453415U patent/CN201667683U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867705A (en) * | 2010-03-31 | 2010-10-20 | 福州开发区鸿发光电子技术有限公司 | Large-zoom ratio automatic focusing integrated camera |
| CN102830489A (en) * | 2011-12-17 | 2012-12-19 | 中国航空工业集团公司洛阳电光设备研究所 | Device and method for compensating depth of field of rotational variable multiple optical system |
| CN102830489B (en) * | 2011-12-17 | 2015-05-06 | 中国航空工业集团公司洛阳电光设备研究所 | Method for compensating depth of field of rotational variable multiple optical system |
| CN103728813A (en) * | 2012-10-15 | 2014-04-16 | 浙江大华技术股份有限公司 | Method for synchronizing focusing operation and zooming operation |
| CN103916584A (en) * | 2013-01-04 | 2014-07-09 | 齐发光电股份有限公司 | Image acquisition system |
| CN104954680A (en) * | 2015-06-16 | 2015-09-30 | 深圳市金立通信设备有限公司 | Camera focusing method and terminal |
| CN107170239A (en) * | 2017-06-30 | 2017-09-15 | 广东工业大学 | A kind of target vehicle follows the trail of grasp shoot method and device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101208 Termination date: 20150331 |
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| EXPY | Termination of patent right or utility model |