CN106559617B - Automatic focusing device of telephoto lens - Google Patents
Automatic focusing device of telephoto lens Download PDFInfo
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- CN106559617B CN106559617B CN201510823283.4A CN201510823283A CN106559617B CN 106559617 B CN106559617 B CN 106559617B CN 201510823283 A CN201510823283 A CN 201510823283A CN 106559617 B CN106559617 B CN 106559617B
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Abstract
The invention provides an automatic focusing device of a telephoto lens, which relates to the field of security equipment and comprises the following components: the system comprises a processor, a video source docking interface, a control signal conversion chip, a lens control wiring interface, a video output interface and a power input interface, wherein the video source docking interface, the control signal conversion chip, the lens control wiring interface, the video output interface and the power input interface are respectively connected with the processor; the control signal conversion chip is also connected with the lens control wiring interface; also includes; and the holder control line interface is connected with the control signal conversion chip. The automatic focusing device of the telephoto lens has the function of realizing the automatic focusing of the telephoto lens, and supports the 3D control function of the holder and the lens. The method can be used for video imaging and automatic focusing of a telephoto lens; and the 3D coordinate positioning function when the video event detection linkage alarms is realized, so that the image required by the video alarm can be accurately amplified.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of security equipment, in particular to an automatic focusing device of a telephoto lens.
[ background of the invention ]
The video event analysis technology is a new technology developed in various monitoring fields in recent years, the technology is sourced from the United states, higher technology sublimation is obtained in France, and the technology is widely applied and popularized in China. However, only the all-in-one pan-tilt camera or the all-in-one ball camera can realize the image tracking analysis function due to the influence of the automation level of the video acquisition equipment. At present, focusing modes of a telephoto lens are electric focusing, and a clear image can be obtained by waiting for a manual command, so that even if a pan-tilt supports tracking preset positions and an alarm input function, the two-dimensional positioning function of an X axis (namely, the horizontal direction) and a Y axis (the vertical direction) can be still realized, and the image of the depth of field of the lens cannot be amplified to an image (namely, a clear image after 3D positioning) suitable for full screen of the size of an alarm point and the Z axis (the depth of field and the deep drawing direction of the lens) positioning of clear focusing.
Because the telephoto lens is widely applied to the special monitoring field, but the functions of automatic focusing and 3D positioning cannot be realized, and the application effect of view finding monitoring and the image capturing effectiveness of the telephoto lens are seriously influenced in practical application, the device which can realize the function of automatic focusing of the telephoto lens, can meet the control of the cloud mirror and can realize the function of 3D positioning of the image becomes another technical requirement in the monitoring field.
[ summary of the invention ]
The invention provides an automatic focusing device of a telephoto lens, which is used for solving the technical problem.
The present invention provides an automatic focusing device for a telephoto lens, comprising: the system comprises a processor, a video source docking interface, a control signal conversion chip, a lens control wiring interface, a video output interface and a power input interface, wherein the video source docking interface, the control signal conversion chip, the lens control wiring interface, the video output interface and the power input interface are respectively connected with the processor; the control signal conversion chip is also connected with the lens control wiring interface; further comprising: and the holder control line interface is connected with the control signal conversion chip.
The video source docking interface is used for connecting a video source to the telephoto lens automatic focusing device; the processor is used for processing the video source and sending a control signal to the control signal conversion chip or directly sending a control signal to the lens control wiring interface; the control signal conversion chip is used for converting the control signal sent by the processor and transmitting the control signal to the lens control wiring interface and the holder control line interface so as to control the telephoto lens butted with the lens control wiring interface to finish automatic focusing and control the holder butted with the holder control line interface to finish visual angle conversion; the video output interface is used for outputting video signals; the power input interface is used for supplying power to the telephoto lens automatic focusing device.
The control signal conversion chip converts the control signal sent by the processor into an RS485 control signal and outputs the RS485 control signal to the lens control wiring interface and the holder control line interface.
After the zoom lens in butt joint with the lens control wiring interface is zoomed or when the zoom lens is not zoomed, a video image accessed by the video source butt joint interface judges whether a preset effect value of clear video is achieved or not through a processor, if the preset effect value is not achieved, the processor sends a control signal to the control signal conversion chip once, or directly sends a control signal to the lens control wiring interface once; and if so, the processor sends a stop command and carries out standby.
Wherein, still include: and the video event alarm access interface is connected with the processor.
The video event alarm access interface is used for accessing a video event alarm signal; after the processor receives a video event alarm signal through the video event alarm access interface, the holder control part: the processor sends a control signal to the control signal conversion chip, the converted control signal is sent to the holder through the holder control line interface, and the holder automatically turns to the direction of the alarm signal source; telephoto lens auto-focusing section: and the processor sends a control signal to the control signal conversion chip or directly sends a control signal to the lens control wiring interface, so that the telephoto lens butted with the lens control wiring interface is zoomed to the full screen position of the alarm signal point, and the telephoto lens is adjusted to finish focusing.
Wherein, the processor is an ARM Cortex-M3 processor.
Wherein, the control signal conversion chip is an SP485ee chip.
The automatic focusing device of the telephoto lens has the function of realizing the automatic focusing of the telephoto lens, and supports the 3D control function of the holder and the lens. The method can be used for video imaging and automatic focusing of a telephoto lens; and the 3D coordinate positioning function when the video event detection linkage alarms is realized, so that the image required by the video alarm can be accurately amplified. The device has small volume, light weight, high technological content and simple and easy operation and integration, and can be used for lenses with long focal length of dozens of millimeters to thousands of millimeters. The device only needs to be in butt joint with a lens control line, a cloud platform control line and a video line, communication control is carried out, an automatic focusing function, a cloud mirror formulation and a 3D positioning image acquisition function can be achieved, focusing is accurate (and a manual focusing correction function is supported), and linkage alarming and positioning are accurate.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
[ detailed description ] embodiments
In order to solve the problems in the prior art, the automatic focusing device of the telephoto lens is a multifunctional control module in form, can be directly butted with a lens control line and placed in a lens shield, can also be placed outside the lens shield, is butted with a pan-tilt control line, is butted with a power supply, and is in communication control with an external control function through a communication control interface. When the zoom control is carried out on the telephoto lens, the device automatically starts the automatic focusing function to obtain a clear image, and if the automatic focusing image is not real and can be corrected through manual focusing. The device simultaneously supports the automatic focusing function after scene change, namely, the device automatically starts the automatic focusing function to obtain a clear image after the holder rotates, and if the automatic focusing image is not real and can be corrected through manual focusing. After the device is connected with an external video event detection alarm function in a butt joint mode, the function of accurately positioning a source image of a linkage alarm 3D signal coordinate can be achieved, and effective video and image information of an alarm point can be obtained in the shortest time. High efficiency, time saving, and reduced error and working strength of manual operation. The following examples are given for the purpose of illustration.
The telephoto lens automatic focusing device according to the embodiment, as shown in fig. 1, includes: the system comprises a processor 11, a video source docking interface 12, a control signal conversion chip 13, a lens control wiring interface 14, a video output interface 15 and a power input interface 16 which are respectively connected with the processor 11; the control signal conversion chip 13 is also connected with a lens control wiring interface 14, and further comprises a pan-tilt control line interface 17 connected with the control signal conversion chip 13; and more preferably, a video event alert access interface 18 coupled to the processor 11.
The video source docking interface 12 is used for connecting a video source to the telephoto lens automatic focusing device of the present embodiment.
The processor 11 is used for processing the video source and sending a control signal to the control signal conversion chip 13; or directly sends a control signal to the lens control wiring interface 14, that is, if the lens is a normal motor control command, the normal motor control command is directly sent to the telephoto lens to perform focusing (i.e., FOCUS) action.
The control signal conversion chip 13 is configured to convert the control signal sent from the processor 11, specifically, may convert the control signal into an RS485 control signal, and forward the control signal to the lens control connection interface 14 and the pan/tilt/zoom control line interface 17, so as to control the telephoto lens butted with the lens control connection interface 14 to complete automatic focusing, and to control the pan/tilt/zoom control line interface 17 to complete view angle conversion.
The video output interface 15 is used to output a video signal.
The power input interface 16 is used to supply power to the telephoto lens auto-focusing device according to the present embodiment.
The video event alert access interface 18 is used to access video event alert signals to the processor 11.
In a specific implementation, the telephoto lens automatic focusing device according to this embodiment may employ multiple layers of PCB boards, various chips, resistors, capacitors, triacs, etc., a chip heat sink, a communication interface, a video source docking interface, a video output interface, a power input interface, etc. The multilayer PCB is mainly made of PVC, PI and other insulating materials, the size of the multilayer PCB is determined according to the practical lens application link, and the thickness of the multilayer PCB is 2-4.0 mm. Copper-laying areas are arranged on the upper surface and the lower surface of the multilayer PCB, and a chip can be welded on the copper-laying areas, and devices such as a communication interface, a power input interface and the like are added. The main body portion of the device is on this multilayer PCB. The surface of the device is subjected to waterproof, dustproof and anticorrosive treatment, and the device is placed in the protective cover to be suitable for the outside. The processor 11 may employ an ARM Cortex-M3 processor (i.e., an ARM Cortex-M3 processor
A processor), the control signal conversion chip 13 may employ an SP485ee chip. The ARM Cortex-M3 processor is suitable for real-time application with high certainty, realizes real-time analysis on the clearness of a video image, stops analysis processing action if the video image is clear, and sends a command to adjust zooming or focusing action of a lens if the video image is not clear so as to achieve clear images.
Specifically, the autofocus device for a telephoto lens according to this embodiment is connected to the telephoto lens (i.e., connected to the zoom and focus function lines of the telephoto lens in a butt joint manner), connected to the video output port of the video camera for video capture, and outputs an RS485 control signal to the pan/tilt and the telephoto lens through the SP485ee chip, or directly sends the control signal to the lens without converting the control signal into an RS485 signal for controlling zoom and focus of the lens. Specific execution parts of the autofocus function: after all the ports are connected, the power supply is normal, when the telephoto lens is doubled or not, after a video source collects a video image in a working state, the image is converted into a signal source which can be identified by an ARM Cortex-M3 processor, whether the signal source reaches a preset effect value of clear video is analyzed and judged, a specific judgment mode can adopt a local sampling method, an integral sampling method, a linear interpolation method and the like, if the signal source does not reach the preset effect value, the ARM Cortex-M3 processor sends out a control signal (if the used telephoto lens is controlled by RS485, the SP485ee chip is selected to be converted into an RS485 command, if the used telephoto lens is a common motor control command, a common motor control command is directly sent out to the telephoto lens to carry out focusing (i.e. FOS) action, and when the control signal is sent out once, the image collected by the video source is transmitted to the ARM Cortex-M3 processor until the effect value of clear image is reached, the ARM Cortex-M3 processor issues a stop command to stand by. The autofocus function may also be triggered by a change in the video scene. If the camera is connected with a fixed-focus lens, the focusing is not needed, and the visual range and the imaging effect of an image are realized in any direction of the scene. However, in the application of a long-focus lens connected with a camera under a normal working state that the lens is zoomed or not zoomed, the focusing function needs to be controlled by manual operation, so that insufficient focusing or over focusing is easily caused, a clear image cannot be obtained (generally, an operator skilled in obtaining the clear image needs about 30 seconds), time is wasted, the operation is completed in one step, and great manual operation intensity is brought to lens control. The device of the embodiment can enable the picture to obtain a clear image within 1 to 2 seconds, greatly improves the working efficiency and wins effective time for real-time monitoring. Specific execution part of the 3D positioning function: after all the ports are connected, the power supply is normal, and after a video event alarm signal is received, the ARM Cortex-M3 processor converts the signal source into an RS485 control signal through the SP485ee chip and sends the RS485 control signal to the holder, and the holder automatically turns to the direction of the alarm signal source; meanwhile, the ARM Cortex-M3 processor converts a signal source into a motor signal for controlling the lens or an RS485 control signal through an SP485ee chip, so that the lens is Zoomed (ZOOM) to the full screen position of an alarm signal point, the Focusing (FOCUS) function of the lens is automatically adjusted, whether the real-time image signal is clear or not is judged through analysis of the processor, and a stop command is automatically sent for standby after the real-time image signal is clear. After the device is in butt joint with a cloud mirror camera system and a video event detection alarm system, when a video alarm signal sends a 3D coordinate value of an alarm point to the device, the device automatically starts a 3D positioning and tracking function to realize accurate positioning of an image 3D coordinate, and if a video event alarm signal source is a variable 3D coordinate value, the device can realize the function of accurately tracking an alarm target.
The advantages of the telephoto lens automatic focusing device of the embodiment are as follows:
1. an external communication control PCB board device is adopted, so that various types of direct current motors or stepping motor lenses on the market can be connected with power lines and control lines on the original lens, and the automatic focusing function can be realized after software debugging; the feasibility is strong, and the use is convenient.
2. The external communication control PCB device not only can assist the telephoto lens to realize the function of automatic focusing and clear imaging, but also can control the holder and the lens through data return to realize the 3D coordinate value positioning function.
3. The comprehensive management chip of the external communication control PCB device is connected, and can be communicated through RS485 or 232, so that the practicability is good, the anti-interference capability is good, and the performance is stable.
4. External communication control PCB board device, it is small, through dustproof, waterproof, anticorrosive treatment, can install in the inside guard shield that also can install in the camera lens outside of camera lens, operating temperature is reliable and stable.
5. The external communication control PCB device has the advantages of accurate software control protocol and content, short time for realizing automatic focusing, accurate clear image acquisition, good universality, stability and reliability.
The description and use of the invention herein are illustrative and exemplary only, and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are fully possible, and alternative and equivalent various components of the embodiments are well known to those skilled in the art. It will also be apparent to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, examples, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof, and that other modifications and variations may be made to the embodiments disclosed herein without departing from the scope or spirit of the invention.
Claims (4)
1. An autofocus device for a telephoto lens, comprising: the system comprises a processor, a video source docking interface, a control signal conversion chip, a lens control wiring interface, a video output interface and a power input interface, wherein the video source docking interface, the control signal conversion chip, the lens control wiring interface, the video output interface and the power input interface are respectively connected with the processor; the control signal conversion chip is also connected with the lens control wiring interface; further comprising: the holder control line interface is connected with the control signal conversion chip;
the video source docking interface is used for connecting a video source to the telephoto lens automatic focusing device;
the processor is used for processing the video source and sending a control signal to the control signal conversion chip or directly sending a control signal to the lens control wiring interface;
the control signal conversion chip is used for converting the control signal sent by the processor and transmitting the control signal to the lens control wiring interface and the holder control line interface so as to control the telephoto lens butted with the lens control wiring interface to finish automatic focusing and control the holder butted with the holder control line interface to finish visual angle conversion;
the video output interface is used for outputting video signals;
the power input interface is used for supplying power to the telephoto lens automatic focusing device;
after the zoom lens in butt joint with the lens control wiring interface is zoomed or when the zoom lens is not zoomed, a video image accessed by the video source butt joint interface judges whether a preset effect value of video clearness is achieved or not through a processor, if the preset effect value is not achieved, the processor sends a control signal to the control signal conversion chip once, or directly sends a control signal to the lens control wiring interface once; if so, the processor sends a stop command and carries out standby;
further comprising: a video event alarm access interface connected to the processor;
the video event alarm access interface is used for accessing a video event alarm signal;
after the processor receives the video event alarm signal through the video event alarm access interface, the holder control part: the processor sends a control signal to the control signal conversion chip, the converted control signal is sent to the holder through the holder control line interface, and the holder automatically turns to the direction of the alarm signal source; telephoto lens auto-focusing section: and the processor sends a control signal to the control signal conversion chip or directly sends a control signal to the lens control wiring interface, so that the telephoto lens butted with the lens control wiring interface is zoomed to the full screen position of the alarm signal point, and the telephoto lens is adjusted to finish focusing.
2. The autofocus apparatus of claim 1, wherein the control signal converter chip converts the control signal from the processor into an RS485 control signal, and outputs the RS485 control signal to the lens control connection interface and the pan/tilt control line interface.
3. The telephoto lens autofocus device as recited in claim 1, wherein the processor is an ARM Cortex-M3 processor.
4. The telephoto lens automatic focusing device as claimed in claim 1, wherein the control signal conversion chip is an SP485ee chip.
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| CN201510823283.4A CN106559617B (en) | 2015-11-25 | 2015-11-25 | Automatic focusing device of telephoto lens |
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| CN201510823283.4A CN106559617B (en) | 2015-11-25 | 2015-11-25 | Automatic focusing device of telephoto lens |
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