CN101021604A - Dynamic target automatic zooming system based on image processing - Google Patents
Dynamic target automatic zooming system based on image processing Download PDFInfo
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- CN101021604A CN101021604A CN200710064687.5A CN200710064687A CN101021604A CN 101021604 A CN101021604 A CN 101021604A CN 200710064687 A CN200710064687 A CN 200710064687A CN 101021604 A CN101021604 A CN 101021604A
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Abstract
An automatic zooming system for dynamic target based on image processing mainly comprises: the zoom lens is used for adjusting the focal length of the camera; a camera for capturing a target image; the image processing control unit receives image data from the camera, divides the target to obtain the imaging size of the target, and decides to send a control command to the lens driving control circuit according to the comparison result of the target size and the set size; and the lens driving control circuit is connected with the image processing control unit through a serial port and is connected with the positive control line and the negative control line of the zoom lens through two cables, and the lens driving control circuit receives a control command sent by the image processing control unit to move the zoom lens so as to adjust the focal length of the camera. The invention has the function of real-time automatic zooming and has the advantages of high efficiency and high precision.
Description
Technical field
The present invention relates to automatic focusing system, particularly a kind of dynamic target automatic focusing system based on Flame Image Process.
Background technology
When video camera (CCD, CMOS) is taken dynamic object, if focus of camera fix, so along with the distance of target range, the size of target on screen also can change.Keep the precision measured, the imaging size that needs to keep target is in a suitable dimensions scope, and present video camera (CCD, CMOS) generally has manual zoom function, by manual shift, carries out zoom, and the target imaging size is controlled at suitable dimension.
But, when taking tracking high-speed mobile target, the quick variation of the generation distance that target can be continuous, present mode has following several, and one is to use manual adjustments, and the 2nd, calculate focal length value, control zoom according to focal length value.This dual mode is all efficient low, and the shortcoming that precision is not high is difficult to guarantee auto zooming.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, a kind of dynamic target automatic focusing system based on Flame Image Process is provided, it can be when tracking target, the size of real-time judge target, autozoom.
Technical scheme of the present invention: a kind of dynamic target automatic focusing system based on Flame Image Process, its characteristics are to comprise: Varifocal zoom lens is used to regulate focus of camera; Video camera is to be used for the photographic subjects image; Image processing control unit is the core of system, and it accepts from the next view data of video camera target to be cut apart, and obtains the imaging size of target, sends control command according to the big or small comparative result decision of target sizes and setting and gives the lens driving control circuit;
The lens driving control circuit, be connected with serial ports with image processing control unit, be connected with the positive and negative control line of Varifocal zoom lens by two cables simultaneously, the lens driving control circuit is accepted the control command that image processing control unit sends, Varifocal zoom lens is moved, to regulate focus of camera.
Principle of the present invention: when the space Fast Moving Object is followed the tracks of, keep target in the range of size that imaging size on the video camera is being scheduled to all the time, pass through image segmentation, obtain the size of target on the image, if be greater than or less than predetermined size, to give an order to image processing control unit, image processing control unit is regulated zoom motor on the camera lens automatically by the lens driving control circuit, make zoom lens move to correct position, the size of target on screen adjusted to preliminary dimension.
The present invention's advantage compared with prior art is: the present invention by image processing control unit because can be when the tracking target, the size of real-time judge target, target sizes compares with the size of being scheduled to, if greater than preliminary dimension or less than preliminary dimension, just regulate the preceding Varifocal zoom lens of video camera,, reach the purpose of adjusting target imaging size on screen by the control of zoom lens, therefore have auto zooming function, and efficient and precision improve greatly.
Description of drawings
Fig. 1 is a principle schematic of the present invention;
Fig. 2 is a lens driving control circuit schematic diagram of the present invention;
Fig. 3 is the theory diagram of image processing control unit of the present invention, and wherein Fig. 3 a is that ordinary PC is the processing of circuit module frame chart that core devices constitutes, and Fig. 3 b is for the digital signal processor DSP being the processing of circuit module frame chart of core devices formation;
Fig. 4 is the process flow diagram of automatic focusing system of the present invention.
Embodiment
As shown in Figure 1, 2, the present invention is made up of Varifocal zoom lens 1, video camera 2, image processing control unit 3, lens driving control circuit 4 and display 5, Varifocal zoom lens 1 is used to regulate the focal length of video camera 2, Varifocal zoom lens 1 is for to be made of zoom motor 12 and zoom lens 11, zoom motor 12 is connected with zoom lens 11, zoom motor 12 rotates the focal length that just can change zoom lens, and zoom motor 12 can be DC electrode or stepper motor; Video camera 2 is used for the photographic subjects image, and the sensor of capture video data can be general video camera commonly used, also can be image acquisition sensors such as charge coupling device CCD, CMOS; Image processing control unit 3 is cores of system, it is accepted from the next view data of video camera, target is cut apart, obtained the imaging size of target, send control command according to the big or small comparative result decision of target sizes and setting and give lens driving control circuit 4; Lens driving control circuit 4 adopts serial ports to be connected with image processing control unit 3, and it also is connected with the positive and negative control line of Varifocal zoom lens 1 by two cables simultaneously.Lens driving control circuit 4 is accepted the control command that image processing control unit 3 sends, difference according to command word, the output cable upload send different time sections ± 12V voltage, the motor on the Varifocal zoom lens 1 can be forward or backward under the driving of voltage moves, and disappears up to driving voltage.
As shown in Figure 2, lens driving control circuit 4 is to be the circuit of core devices with DSP, and in actual the use, DSP has selected the TMS320LF2407A of TI company for use.DSP realizes communicating by letter by the good by appointment agreement of serial ports with image processing control unit 3, it waits for the interrupt request of image processing control unit 3 in the mode of interrupt response, real-time response is interrupted, in interrupt handling routine, judge the character string command that image processing control unit 3 is sent here by serial ports, according to different character strings, output ± 12V voltage signal on the voltage output interface, the power on length of continuous time of pressure holding of output interface is corresponding with different character strings, by input, judge whether the zoom motor 12 in the Varifocal zoom lens 1 rotate in place again.DSP also detects outside limit signal in real time, in case signal is effective, just stops operating.Voltage output interface in succession positive and negative by cable and zoom motor 12 according to the order of DSP, finished the function of voltage transitions output among Fig. 2.
The flow process of the drive controlling of lens driving control circuit 4: the order of receiving image processing control unit 3 as DSP by serial ports, just according to the agreement of program agreement to command process, according to the voltage of the difference output different time length of ordering, the output time of voltage adopts the stepping method, is to explore the stepping process, adopt big step pitch when far away apart from expectation value, when near the time, switch to the small step distance, when fine adjustments, switch to littler step pitch, can improve response like this, guarantee that the adjusting time is quick.Voltage output interface output ± 12V voltage on the circuit board that passes through drives zoom motor 12 and rotates accordingly.DSP detects the position that motor rotates simultaneously in zoom motor 12 rotation processes, judges whether zoom motor 12 forwards endpoint location to, and provides feedback to graphics processing unit 3.
Shown in Fig. 3 a and Fig. 3 b, image processing control unit 3 is to be the processing of circuit module of core devices formation with ordinary PC or digital signal processor DSP.
Shown in Fig. 3 a, comprise PC, two parts of image pick-up card based on the hardware of the image processing control unit of PC.Comprise the CPU, hard disk, internal memory of general use etc. in the PC: image pick-up card is installed in the ordinary PC, and the runs image processing software program is connected with the lens driving control circuit by serial ports.Control command is sent to the lens driving control circuit.Image pick-up card is inserted in the PCI slot of computing machine, is connected with video camera or CCD by video line, and image pick-up card is finished the analog to digital conversion of vision signal and calculator memory is gone in the data image signal collection.
Shown in Fig. 3 b, comprise digital signal processor DSP, complex programmable logic device (CPLD), Flash Memory based on the hardware of the image processing control unit of digital signal processor DSP.
Digital signal processor DSP carries out image algorithm to be handled, and comprises filtering and noise reduction, Image Edge-Detection, and image segmentation, zone marker, regional connectivity are calculated to be the size of picture.The effect of complex programmable logic device (CPLD) is the sequential of the image that transmits of control DSP reading images sensor, gives DSP the view data that DSP requires to obtain.The function of Flash Memory is the software program code and the store image information of storage dsp system operation.
The process software of the graphics processing unit 3 among the present invention comprises the image acquisition program, and image processing program is judged control program three parts.
(1) the image acquisition program is used for the vision signal of video camera or CCD is carried out analog to digital conversion by image pick-up card hardware.Software can be set the frequency of collection, and the image resolution ratio of collection can be regulated functions such as contrast.
(2) image processing program is handled gathering the digital picture of coming in.Comprise filtering and noise reduction, Image Edge-Detection, image segmentation, zone marker, regional connectivity are calculated to be the length of picture and wide, i.e. imaging size A.
(3) judge that control program is used for the big or small A of imaging and the big or small B of expectation are compared, the size dimension B of expectation can set in software in advance, also can real time modifying.As imaging size A during greater than desired size B, control program sends the character string command of zoom lens reach to Drive and Control Circuit by serial ports.Otherwise, as imaging size A during less than desired size B, the character string command that control program moves after Drive and Control Circuit is sent zoom lens by serial ports.
As shown in Figure 4, the concrete course of work of the present invention is as follows:
(1) watch-dog is opened, and is used to observe the target of tracked shooting, during target is in and moves.
(2) image processing control unit 3 is set the target sizes size that expectation obtains, and can set in advance, also can revise in tracing process.
(3) video camera 2 photographic images, view data one tunnel are delivered to display screen and are shown that image processing control unit 3 is delivered on another road.
(4) operation related software in the graphics processing unit 3 is cut apart the target in the image, the algorithm of image segmentation, and software extracts the size characteristic of target, according to cutting apart the object edge line that obtains, extracts the size length and width information A of target.
(5) expect that the size scope B that obtains is solidificated in the software of graphics processing unit in advance, also can revise on software interface.Compare A and B in the software, if target size A less than the B that sets, sends the control word order that moves forward.If instead target size A greater than the B that sets, sends the control word order of moving backward.If target size A does not then send order in the B scope of setting.
(6) order that sends in the graphics processing unit 3, pass to control Driver Circuit 4 by Serial Port Line, lens driving control circuit 4 is accepted the control command that image processing control unit sends, according to the difference of command word, output cable upload send different time sections ± 12V voltage.
(7) motor on the Varifocal zoom lens 1 is subjected to Control of Voltage, when receive ± during 12V voltage, just can before and after rotate, move forward and backward thereby drive camera lens, reach the purpose that changes focal length.The change of focal length makes the size of imaging change.
(8) by such closed-loop control, reach when the dynamic object fast moving, adjust the target imaging size automatically to specified size.
Claims (6)
1, a kind of dynamic target automatic focusing system based on Flame Image Process is characterized in that mainly comprising:
Varifocal zoom lens is used to regulate focus of camera;
Video camera is used for the photographic subjects image;
Image processing control unit is accepted from the next view data of video camera target to be cut apart, and obtains the imaging size of target, sends control command according to the big or small comparative result decision of target sizes and setting and gives the lens driving control circuit;
The lens driving control circuit, be connected with serial ports with image processing control unit, be connected with the positive and negative control line of Varifocal zoom lens by two cables simultaneously, the lens driving control circuit is accepted the control command that image processing control unit sends, Varifocal zoom lens is moved, to regulate focus of camera.
2, the dynamic target automatic focusing system based on Flame Image Process according to claim 1, it is characterized in that: described Varifocal zoom lens is made of zoom motor and zoom lens.
3, the dynamic target automatic focusing system based on Flame Image Process according to claim 1 is characterized in that: described zoom motor is DC electrode or stepper motor.
4, the dynamic target automatic focusing system based on Flame Image Process according to claim 1 is characterized in that: described video camera is video camera commonly used, or image acquisition sensors such as charge coupling device CCD, CMOS.
5, the dynamic target automatic focusing system based on Flame Image Process according to claim 1 is characterized in that: described image processing control unit is to be the processing of circuit module of core devices formation with ordinary PC or digital signal processor DSP.
6, the dynamic target automatic focusing system based on Flame Image Process according to claim 1 and 2, it is characterized in that: described lens driving control circuit is to be the circuit of core devices with DSP, DSP realizes communicating by letter by the good by appointment agreement of serial ports with image processing control unit, the judgement of control command is finished in the order that it is sent here by serial ports according to image processing control unit, the voltage signal that the time of sending is not waited, by input, judge whether the zoom motor in the Varifocal zoom lens rotate in place again; DSP also detects outside limit signal in real time, in case signal is effective, just stops operating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100646875A CN101021604B (en) | 2007-03-23 | 2007-03-23 | Dynamic target automatic zooming system based on image processing |
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| CN2007100646875A CN101021604B (en) | 2007-03-23 | 2007-03-23 | Dynamic target automatic zooming system based on image processing |
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| CN101021604A true CN101021604A (en) | 2007-08-22 |
| CN101021604B CN101021604B (en) | 2010-07-21 |
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| CN102281398A (en) * | 2010-06-10 | 2011-12-14 | 佳能株式会社 | Image pickup apparatus and method for controlling image pickup apparatus |
| CN103584888A (en) * | 2013-12-02 | 2014-02-19 | 深圳市恩普电子技术有限公司 | Ultrasonic target motion tracking method |
| CN103957060A (en) * | 2014-05-21 | 2014-07-30 | 中国人民解放军信息工程大学 | Visible light receiving device and visible light communication method |
| CN104883506A (en) * | 2015-06-26 | 2015-09-02 | 重庆智韬信息技术中心 | Self-service shooting method based on face identification technology |
| 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 |
| CN106301109A (en) * | 2016-09-20 | 2017-01-04 | 北京旷视科技有限公司 | Circuit for controlling motor and motor control method |
| CN106910206A (en) * | 2017-01-17 | 2017-06-30 | 邢惠钧 | A kind of method for tracking target and device |
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| CN109803090A (en) * | 2019-01-25 | 2019-05-24 | 睿魔智能科技（深圳）有限公司 | Unmanned shooting automatic zooming method and system, unmanned cameras and storage medium |
| US10317777B2 (en) | 2015-03-27 | 2019-06-11 | Huawei Technologies Co., Ltd. | Automatic zooming method and apparatus |
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| CN110249618A (en) * | 2017-07-31 | 2019-09-17 | 深圳市大疆创新科技有限公司 | Control device, lens assembly, photographic device, control method and program |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000258682A (en) * | 1999-03-08 | 2000-09-22 | Olympus Optical Co Ltd | Automatic focusing device |
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2007
- 2007-03-23 CN CN2007100646875A patent/CN101021604B/en not_active Expired - Fee Related
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| CN102281398B (en) * | 2010-06-10 | 2014-01-22 | 佳能株式会社 | Image pickup apparatus and method for controlling image pickup apparatus |
| CN102281398A (en) * | 2010-06-10 | 2011-12-14 | 佳能株式会社 | Image pickup apparatus and method for controlling image pickup apparatus |
| CN108540696A (en) * | 2012-07-30 | 2018-09-14 | Lg伊诺特有限公司 | Camera model |
| CN103584888A (en) * | 2013-12-02 | 2014-02-19 | 深圳市恩普电子技术有限公司 | Ultrasonic target motion tracking method |
| 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 |
| 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 |
| CN103957060A (en) * | 2014-05-21 | 2014-07-30 | 中国人民解放军信息工程大学 | Visible light receiving device and visible light communication method |
| CN103957060B (en) * | 2014-05-21 | 2017-04-12 | 中国人民解放军信息工程大学 | Visible light receiving device and visible light communication method |
| US10317777B2 (en) | 2015-03-27 | 2019-06-11 | Huawei Technologies Co., Ltd. | Automatic zooming method and apparatus |
| CN104883506A (en) * | 2015-06-26 | 2015-09-02 | 重庆智韬信息技术中心 | Self-service shooting method based on face identification technology |
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| CN104883506B9 (en) * | 2015-06-26 | 2021-09-03 | 重庆智韬信息技术中心 | Self-service shooting method based on face recognition technology |
| CN106301109A (en) * | 2016-09-20 | 2017-01-04 | 北京旷视科技有限公司 | Circuit for controlling motor and motor control method |
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| CN110249618A (en) * | 2017-07-31 | 2019-09-17 | 深圳市大疆创新科技有限公司 | Control device, lens assembly, photographic device, control method and program |
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