CN101867705A - Large-zoom ratio automatic focusing integrated camera - Google Patents
Large-zoom ratio automatic focusing integrated camera Download PDFInfo
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- CN101867705A CN101867705A CN 201010136324 CN201010136324A CN101867705A CN 101867705 A CN101867705 A CN 101867705A CN 201010136324 CN201010136324 CN 201010136324 CN 201010136324 A CN201010136324 A CN 201010136324A CN 101867705 A CN101867705 A CN 101867705A
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Abstract
The invention relates to a large-zoom ratio automatic focusing integrated camera, which belongs to the field of optical, mechanical and electronic integration. The camera comprises an automatic focusing system, a video drive system and a shell thereof. The camera adopts a contrast detection method to carry out automatic focusing, and a processor (108) of the automatic focusing system is utilized to send out control signals to acquire, process, calculate and compare image signals and processing signals to control a step motor (111) to drive a compensation assembly (G4) to move to a focusing position, so that the camera is automatically focused. The automatic focusing of the camera does not need an auxiliary light source, and cannot be affected by the distance of an object, the focusing process is controlled by the microprocessor, the time is short, the camera also has the function of video drive, and can automatically adjust an aperture according to environments, so the camera can be accurately, quickly and automatically focused under various environments, while the image cannot be distorted, and the camera can be widely applied to fields, such as expressways, air ports, finance, military, ports and the like.
Description
Technical field
The invention belongs to the optical, mechanical and electronic integration field, relate to a kind of integrated camera that is used for protection and monitor field, 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 monitoring camera lens of producing both at home and abroad in the security protection industry comprises zoom lens and tight shot, and wherein the automaticity of the controllability of zoom lens zooming range size, focal length adjustment and lens aperture control etc. all directly influences the performance and the technical merit thereof of product.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 invention is to provide a kind of have 16 times of big zoom ratio abilities, in whole zoom process, can realize self-focusing integrated camera.
The present invention seeks to be achieved through the following technical solutions: 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 CCD102, 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 present invention 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 present invention simultaneously adopts video drive, can regulate aperture automatically according to environment, therefore the present invention 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 invention, comprises optical system, autofocus system, video frequency driving system;
Fig. 2 is a structural representation of the present invention;
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 present invention 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.Circuit board 206 is equipped with in the present invention 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 present invention 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 CCD 102 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 CCD 102, amplifier 105, filter 106, A/D conversion chip 107, processor 108, control card 109, driver 110 and stepping motor 111, send control signal control CCD 102 images acquired signals 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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| CN 201010136324 CN101867705A (en) | 2010-03-31 | 2010-03-31 | Large-zoom ratio automatic focusing integrated camera |
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| CN 201010136324 CN101867705A (en) | 2010-03-31 | 2010-03-31 | Large-zoom ratio automatic focusing integrated camera |
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Cited By (3)
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| CN104010131A (en) * | 2014-05-05 | 2014-08-27 | 深圳市莫孚康技术有限公司 | Automatic follow-focus device and method of cameras |
| CN104639894A (en) * | 2014-12-11 | 2015-05-20 | 北京中星微电子有限公司 | Image focusing method and device for surveillance camera |
| CN104917956A (en) * | 2014-03-12 | 2015-09-16 | 全视技术有限公司 | System And Method For Continuous Auto Focus Within Camera Module |
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| CN1604335A (en) * | 2004-11-15 | 2005-04-06 | 西华大学 | CCD image sensor and high-precision linear dimension measuring device and measuring method thereof |
| CN101064779A (en) * | 2006-04-27 | 2007-10-31 | 中兴通讯股份有限公司 | Method for realizing minisize camera automatic focusing and minisize camera thereof |
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| CN104917956A (en) * | 2014-03-12 | 2015-09-16 | 全视技术有限公司 | System And Method For Continuous Auto Focus Within Camera Module |
| CN104917956B (en) * | 2014-03-12 | 2018-10-09 | 豪威科技股份有限公司 | For the continuous autofocus system and method in camera model |
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| CN104639894A (en) * | 2014-12-11 | 2015-05-20 | 北京中星微电子有限公司 | Image focusing method and device for surveillance camera |
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Open date: 20101020 |