CN202563147U - Wireless automatic focusing system - Google Patents
Wireless automatic focusing system Download PDFInfo
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- CN202563147U CN202563147U CN2012200623367U CN201220062336U CN202563147U CN 202563147 U CN202563147 U CN 202563147U CN 2012200623367 U CN2012200623367 U CN 2012200623367U CN 201220062336 U CN201220062336 U CN 201220062336U CN 202563147 U CN202563147 U CN 202563147U
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Abstract
The utility model discloses a wireless automatic focusing system. The wireless automatic focusing system comprises a lens, an image display screen, a charge coupled device (CCD) sensor, a video synchronization separation module, an analogue-digital (AD) acquisition module, an automatic focusing drive module, a first wireless transmission module, a second wireless transmission module, a master controller and a vice controller, wherein the lens is respectively connected with the CCD sensor and the automatic focusing drive module; the CCD sensor is respectively connected with the image display screen and the video synchronization separation module; the video synchronization separation module is respectively connected with the AD acquisition module and the vice controller; the AD acquisition module is connected with the vice controller; the vice controller is respectively connected with the first wireless transmission module and the automatic focusing drive module; and the second wireless transmission module is connected with the master controller. The wireless automatic focusing system has the advantages that the system structure is simplified; the fussy operation caused by connecting wires is avoided; the wireless automatic focusing system is convenient to install; and simultaneously, the anti-interference of the external environment is improved.
Description
Technical field
The utility model relates to a kind of autofocus system, especially relates to a kind of wireless autofocus system.
Background technology
Autofocus system is the control system of a closed loop, and it comprises the automatic detection and automatic adjustment two parts of signal, and with respect to manual focusing, it has easy to operate, the characteristics that precision and efficient are higher, but the general more complicated of its structure, and cost is also than higher.Traditional autofocus system can be divided into two types of active autofocus system and passive type autofocus systems.Active autofocus system is a distance of utilizing emission infrared ray or ultrasound wave to measure object, and autofocus system drives the camera adjusting image distance according to the range data that is obtained, thereby accomplishes automatic focus; The passive type autofocus system is through the information of acceptance from object, and the mode of survey or phase difference detection of looking with electronics is accomplished automatic focus.But traditional autofocus system circuit is various, complex structure, and installation process is more loaded down with trivial details, receives the interference of external environment easily, loses standard thereby cause focusing on, and is image blurring.
Summary of the invention
It is simple, easy for installation that the utility model technical matters to be solved provides a kind of circuit, the wireless autofocus system of strong interference immunity.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of wireless autofocus system; Comprise camera lens and image display panel; Also comprise ccd sensor, audio video synchronization separation module, AD acquisition module, automatic focus driver module, first wireless transport module, second wireless transport module, master controller and submaster controller; Described camera lens is connected with described automatic focus driver module with described ccd sensor respectively; Described ccd sensor is connected with described audio video synchronization separation module with described image display panel respectively; Described audio video synchronization separation module is connected with described submaster controller with described AD acquisition module respectively; Described AD acquisition module is connected with described submaster controller, and described submaster controller is connected with described automatic focus driver module with described first wireless transport module respectively, and described second wireless transport module is connected with described master controller.
Described master controller is connected with the TFT touch display screen.
Described audio video synchronization separation module is that integrated chip and the peripheral circuit of LM1881 formed by model mainly, and described AD acquisition module is that integrated chip and the peripheral circuit of ADS828 formed by model mainly.
Described first wireless transport module is that integrated chip and the peripheral circuit of NRF2401 formed by model mainly, and described second wireless transport module is that integrated chip and the peripheral circuit of NRF2401 formed by model mainly.
Described master controller is that integrated chip and the peripheral circuit of Cortex-M3 formed by model mainly, and described submaster controller is that integrated chip and the peripheral circuit of Cortex-M0 formed by model mainly.
Described automatic focus driver module is that 8050 PNP triode, model are 8550 NPN triode and form based on the H bridge driving circuit of L9110 chip for driving by model mainly.
Compared with prior art; The advantage of the utility model is to cooperate focus method through master controller and submaster controller are set, and not only can realize closely focusing on, and can also realize far distance automatic focusing; Through first wireless transport module of setting and being used of second wireless transport module; Utilize wireless communication technology to realize the wireless transmission of image video signal and control signal, simplified system architecture, the troublesome operation of having avoided wiring to bring; Easy for installation, improved the anti-interference of environment to external world simultaneously;
If master controller is connected with the TFT touch display screen, the user can add artificial intervention to image focusing as requested, and adaptability is stronger;
If it is the chip of Cortex-M3 that master controller adopts model, it is the chip of Cortex-M0 that submaster controller adopts model, and its price is equal to 8 MCU; And it has 32 performance of processors; Accelerated data processing speed, strengthened focusing effect, made it have higher economic and practical; If it is the chip of ADS828 that the AD sampling module adopts model, can the rich image video signal collective count further improved the degree of accuracy that focuses on;
If the automatic focus driver module is avoided the race hazard between drive signal through the complementary PWM ripple of H bridge driving circuit output based on the L9110 chip for driving, make motor-driven control more steadily effectively.
Description of drawings
Fig. 1 is the structured flowchart of the utility model;
Fig. 2 is the circuit connection diagram of AD acquisition module, first wireless transport module and the submaster controller of utility model;
Fig. 3 is the aperture control unit circuit figure of the automatic focus driver module of the utility model;
Fig. 4 is the motor-driven control unit circuit figure of the automatic focus driver module of the utility model;
Fig. 5 is the workflow diagram of the utility model.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
As shown in Figure 1; A kind of wireless autofocus system; Comprise camera lens 1, ccd sensor 2, image display panel 3, audio video synchronization separation module 4, AD acquisition module 5, first wireless transport module 6, automatic focus driver module 7, submaster controller 8, second wireless transport module 9 and master controller 10; Camera lens 1 is connected with automatic focus driver module 7 with ccd sensor 2 respectively; Ccd sensor 2 is connected with audio video synchronization separation module 4 with image display panel 3 respectively, and audio video synchronization separation module 4 is connected with submaster controller 8 with AD acquisition module 5 respectively, and AD acquisition module 5 is connected with submaster controller 8; Submaster controller 8 is connected with automatic focus driver module 7 with first wireless transport module 6 respectively, and second wireless transport module 9 is connected with master controller 10.
In the above-mentioned specific embodiment, camera lens 1 can be 10 times of all-in-ones, and image display panel 3 can shield for white and black displays, and audio video synchronization separation module 4 is that integrated chip and the peripheral circuit of LM1881 formed by model mainly; As shown in Figure 2; AD acquisition module 5 is that integrated chip and the peripheral circuit of ADS828 formed by model mainly; First wireless transport module 6 is that integrated chip and the peripheral circuit of NRF2401 formed by model mainly; Second wireless transport module 9 is that integrated chip and the peripheral circuit of NRF2401 formed by model mainly, and submaster controller 8 is that integrated chip and the peripheral circuit of Cortex-M0 formed by model mainly, and master controller 10 is main to be that integrated chip and the peripheral circuit of Cortex-M3 formed by model; Cortex-M0 chip and Cortex-M3 chip are the arm processors of high performance-price ratio on the market; Its price is equal to 8 MCU, but has the performance of 32 bit processors, can accelerate data processing speed.
In the above-mentioned specific embodiment; Master controller 10 can be connected with TFT touch display screen 11; TFT touch display screen 11 is as a User Interface; The user can adjust the correlation parameter (brightness of image, resolution, white balance or contrast etc.) of image as requested, can also image scene be reproduced simultaneously, makes the user reach the purpose of remote monitoring.
In the above-mentioned specific embodiment, automatic focus driver module 7 mainly comprises aperture control module and motor-driven control module, physical circuit such as Fig. 3 and shown in Figure 4.Aperture control module major control DAMP+ signal and DAMP-signal, the 3.3V DC voltage directly links to each other with the DAMP+ signal end through 22 Europe resistance, and the 3.3V DC voltage links to each other with the base stage B of 8050 triodes; The emitter E ground connection of 8050 triodes; The collector C of 8050 triodes links to each other with the DAMP-signal end, when DAMP+ signal end input high level, and DAMP-signal end input low level; And when satisfying certain power input, aperture is opened; Motor-driven control module major control DRIVE+, DRIVE-, FOCUS_A+, FOCUS_A-, FOCUS_B+ and FOCUS_B-signal, the driving principle and the circuit connecting of DRIVE+ and DRIVE-signal are consistent with DAMP+ and DAMP-signal.Two chip for driving control FOCUS_A+ and FOCUS_A-signals that model is L9110; Its control mouthful PA+, PA-links to each other with the IO mouth of the Cortex-M0 chip of submaster controller 8, when the PA+ input high level; A+ output high level during the PA-input low level, the A-output low level; When the PA+ input low level, A+ output low level during the PA-input high level, A-exports high level; When PA+ and PA-while input high level or low level, A+ and A-all export output low level.Like this; The motor-driven control module not only amplifies the electric current of IO mouth, and make two output terminals A+with A-can not export high level, stable drive stepping motor simultaneously; Control step motor stretching camera lens 1; The adjustment focal position avoids the IO mouth to drive the race and hazard phenomenon that occurs simultaneously, and the driving principle and the circuit connecting of FOCUS_B+ and FOCUS_B-control signal are consistent with FOCUS_A+ and FOCUS_A-signal.
As shown in Figure 5; The principle of work of the utility model is: camera lens 1 is taken in the external image signal; But picture signal is converted into the electric signal of digital processing through ccd sensor 2; A road of this electric signal is delivered to image display panel 3 and is shown that judge foundation the most intuitively with this as focusing effect, another road of this electric signal is delivered to and isolated line synchronizing signal and parity field synchronizing signal in the audio video synchronization separation module 4; When submaster controller 8 successively receiver, video synchronizing separator circuit 4 isolated strange field sync signals (rising edge triggering) and line synchronizing signal (rising edge triggering); To export high level at PIO1.2, this moment, image data acquiring was carried out in 5 startups of AD acquisition module; AD acquisition module 5 is sent into the data that collect in the submaster controller 8 through parallel data transmission IO mouth and is sent in second wireless transport module 9 through first wireless transport module 6 behind the buffer memory again; Second wireless transport module 9 sends to the data that receive in the master controller 10, and the Cortex-M3 chip of master controller 10 utilizes the grey scale difference algorithm that the sharpness of the view data of reception is analyzed, and its algorithm expression formula is:
, wherein
F (i)Expression the
iWidth of cloth difference image,
f i (x, y)Expression
F (i)(
x,
y) gray-scale value at pixel place,
f i (x, y-1)Expression
F (i)(
x,
Y-1) gray-scale value at pixel place,
f i (x-1, y)Expression
F (i)(
X-1,
y) gray-scale value at pixel place.Theoretical according to Digital Image Processing: how many image focusing degree (being whether image is clear) mainly determining by light distribution medium-high frequency component; High fdrequency component is image blurring at least; The abundant then clear picture of high fdrequency component, the contrast that shows as image in the spatial domain changes obviously; The image that can draw collection is clear more, promptly
F (i)Be worth greatly more, just the effect that focuses on of explanation is good more; Draw current according to the grey scale difference algorithm
F (i)Value and preceding once draws
F (i-1)Value compares
,Judge whether image is in best focus.When the client does not launch TFT touch display screen 11; Master controller 10 draws the data of stepper motor adjustment according to the data of grey scale difference algorithm; And be converted into control signal and send to first wireless transport module 6 through second wireless transport module 9; First wireless transport module 6 is transferred to submaster controller 8 with this control signal again; Submaster controller 8 sends corresponding PWM wave control signal to automatic focus driver module 7 according to this control signal, and automatic focus driver module 7 drive stepping motor adjustment camera lens 1 carries out automatic focus; Adjusted the correlation parameter (brightness of image, resolution, white balance or contrast etc.) of image through TFT touch display screen 11 as the client; Be converted into control signal behind the corresponding data of master controller 10 according to this adjustment information modification grey scale difference algorithm and send to first wireless transport module 6 through second wireless transport module 9; First wireless transport module 6 is transferred to submaster controller 8 with this control signal again; Submaster controller 8 sends corresponding PWM wave control signal to automatic focus driver module 7 according to this control signal, and automatic focus driver module 7 drive stepping motor adjustment camera lens 1 carries out automatic focus.
Claims (6)
1. wireless autofocus system; Comprise camera lens and image display panel; It is characterized in that also comprising ccd sensor, audio video synchronization separation module, AD acquisition module, automatic focus driver module, first wireless transport module, second wireless transport module, master controller and submaster controller; Described camera lens is connected with described automatic focus driver module with described ccd sensor respectively; Described ccd sensor is connected with described audio video synchronization separation module with described image display panel respectively; Described audio video synchronization separation module is connected with described submaster controller with described AD acquisition module respectively; Described AD acquisition module is connected with described submaster controller, and described submaster controller is connected with described automatic focus driver module with described first wireless transport module respectively, and described second wireless transport module is connected with described master controller.
2. a kind of wireless autofocus system according to claim 1 is characterized in that described master controller is connected with the TFT touch display screen.
3.3. a kind of wireless autofocus system according to claim 1; It is characterized in that described audio video synchronization separation module is that integrated chip and the peripheral circuit of LM1881 formed by model mainly, described AD acquisition module is that integrated chip and the peripheral circuit of ADS828 formed by model mainly.
4. a kind of wireless autofocus system according to claim 1; It is characterized in that described first wireless transport module is that integrated chip and the peripheral circuit of NRF2401 formed by model mainly, described second wireless transport module is that integrated chip and the peripheral circuit of NRF2401 formed by model mainly.
5. a kind of wireless autofocus system according to claim 1; It is characterized in that described master controller is that integrated chip and the peripheral circuit of Cortex-M3 formed by model mainly, described submaster controller is that integrated chip and the peripheral circuit of Cortex-M0 formed by model mainly.
6. a kind of wireless autofocus system according to claim 1 is characterized in that described automatic focus driver module is that 8050 PNP triode, model are 8550 NPN triode and form based on the H bridge driving circuit of L9110 chip for driving by model mainly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200623367U CN202563147U (en) | 2012-02-24 | 2012-02-24 | Wireless automatic focusing system |
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| CN2012200623367U CN202563147U (en) | 2012-02-24 | 2012-02-24 | Wireless automatic focusing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106488142A (en) * | 2016-12-08 | 2017-03-08 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of auto iris signal conversion method and circuit |
-
2012
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106488142A (en) * | 2016-12-08 | 2017-03-08 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of auto iris signal conversion method and circuit |
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Granted publication date: 20121128 Termination date: 20150224 |
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| EXPY | Termination of patent right or utility model |