CN110928175B - Camera time synchronization system based on LED lamp - Google Patents
Camera time synchronization system based on LED lamp Download PDFInfo
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- CN110928175B CN110928175B CN201911317720.XA CN201911317720A CN110928175B CN 110928175 B CN110928175 B CN 110928175B CN 201911317720 A CN201911317720 A CN 201911317720A CN 110928175 B CN110928175 B CN 110928175B
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- G—PHYSICS
- G04—HOROLOGY
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- G04G5/00—Setting, i.e. correcting or changing, the time-indication
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- G04G—ELECTRONIC TIME-PIECES
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Abstract
The invention relates to a camera time synchronization system based on an LED lamp. The time synchronization system comprises: the LED time setting lamp comprises an LED time setting lamp panel and a controller; the LED time setting lamp panel comprises a plurality of LED lamps; the output end of the controller is connected with the control ends of the LED lamps through a control data line; the controller is used for generating stroboflash-free pulse signals with different frequencies, transmitting the stroboflash-free pulse signals to the plurality of LED lamps through the control data line and controlling the states of the plurality of LED lamps; and the plurality of cameras shoot the LED time-tick lamp panel at the same time and are used for realizing time proofreading during image processing. The controller controls the LED time tick lamp panel to display the non-stroboscopic signal with the specific frequency, so that the phenomenon of flickering is avoided, the shape of the LED time tick lamp panel can be flexibly designed, the view field area of the camera is reduced as much as possible by the LED time tick lamp panel, the LED lamp brightness of the LED time tick lamp panel is high, the camera can shoot high-precision and high-resolution signals, and accurate time tick between multiple cameras is realized.
Description
Technical Field
The invention relates to the field of digital image processing, in particular to a camera time setting system based on an LED lamp.
Background
Compared with other sensors, digital images have the advantages of intuition, multiple observation points (for a camera, the number of pixels is the number of observation points), fast technical progress, mature technology and the like, so that in recent years, cameras, high-speed cameras and thermal infrared cameras are widely applied to scientific experimental research and engineering technical application as observation means. However, different kinds of cameras have their own advantages. For example, a general commercial camera is slow in speed (one frame to several hertz for several seconds), but high in the number of pixels (in the order of ten million pixels), and can continuously photograph for a long time at a low speed; high-speed camera shooting speeds (kilohertz to megahertz levels) are high, but the number of pixels (thousands of pixels to millions of pixels) is low; the thermal infrared camera may capture thermal information of the experimental sample. Therefore, in order to obtain more comprehensive information, researchers are increasingly adopting a scheme of joint observation by multiple cameras. Such as the development of experiments using a combination of a common commercial camera, a high-speed camera and a thermal infrared camera.
Based on the above development background, the problem of multi-camera time synchronization (or time calibration, time synchronization) is generated. The currently common multi-camera time synchronization means is to use an external trigger signal to activate a camera or a camera shutter, so as to implement time synchronization at the first frame or some frames. The disadvantages of this approach are: 1) compatibility is poor, external trigger interfaces and voltages of various cameras are possibly different, and a corresponding trigger cable needs to be designed or purchased and the voltages are converted when a new camera is added every time; 2) the time difference between the cameras is still unknown and cannot be controlled, the response time of different cameras to the trigger signal is different, the response time is limited by the type and the manufacturer of the cameras, and a user cannot control the response time; moreover, because the shutter time of different cameras is very different, camera manufacturers only design the cameras according to the performance requirements of the cameras, so that the response time of different types of cameras to trigger signals is very different (can be as large as several orders of magnitude), and the time synchronization quality between low-speed cameras and high-speed cameras is greatly influenced; 3) the time points which can be used for time synchronization are few, the cameras are controlled by adopting the external trigger signals, and continuous photographing is usually started by utilizing the first electric pulse in the trigger signals, so that only one time point is needed among the cameras; a few cameras (low-speed cameras and partial high-speed cameras) can use an external trigger signal to trigger each shutter action (i.e. take a picture), but it is difficult for cameras with different speeds to share the same pulse signal, for example, a high-speed camera uses a periodic pulse signal of 5kHz, and such a high-speed signal cannot be normally responded to by the low-speed camera at all.
One idea for solving the problem is as follows: all cameras shoot the same object which can display time. Such as some physical signal or some clock. However, under existing conditions, this concept is not convenient or even useful. Because, triggering some kind of physical signal often requires human manipulation, which introduces errors and instability; the clock based on the pointer has poor stability at the speed of kilohertz and megahertz, and is not suitable for high-speed time synchronization; the existing electronic clocks have relatively good stability, but also have the following disadvantages: 1) the brightness is very low and is hardly visible under the condition of extremely short shutter time of a high-speed camera; 2) the stroboscopic effect is very common, but the stroboscopic effect is very common when the electronic clock is designed for human eyes to watch, and the stroboscopic effect is suddenly and suddenly generated under the conditions that a high-speed camera and even a high-speed shutter of a low-speed camera take a picture, so that a useful signal cannot be provided; 3) ordinary electronic clocks cannot provide signals with high accuracy and resolution above kilohertz; 4) the area of a common electronic clock is too large, and for a high-speed camera, the view area is often reduced as much as possible in order to improve the photographing speed, while the area of the common electronic clock (several centimeters by several centimeters) is far larger than the view area provided by the high-speed camera for time synchronization.
Disclosure of Invention
The invention aims to provide a camera time synchronization system based on an LED lamp, which realizes accurate time synchronization among a plurality of cameras.
In order to achieve the purpose, the invention provides the following scheme:
a camera time setting system based on an LED lamp, comprising: the LED time setting lamp comprises an LED time setting lamp panel and a controller;
the LED time setting lamp panel comprises a plurality of LED lamps;
the output end of the controller is connected with the control ends of the LED lamps through a control data line; the controller is used for generating non-stroboscopic pulse signals with different frequencies, transmitting the non-stroboscopic pulse signals to the plurality of LED lamps through the control data line and controlling the states of the plurality of LED lamps;
and the plurality of cameras shoot the LED time-tick lamp panel at the same time and are used for realizing time proofreading during image processing.
Optionally, the LED time-tick lamp panel further includes: a PCB board;
and the LED lamps are fixed on the PCB.
Optionally, the time synchronization system further includes: an external trigger;
the output end of the external trigger is connected with the input end of the controller through an external trigger signal data line; the external trigger is used for generating an external pulse signal and transmitting the external pulse signal to the controller; the controller is further used for converting the external pulse signal into an external non-stroboscopic pulse signal, transmitting the external non-stroboscopic pulse signal to the LED lamps, and controlling the states of the LED lamps through the control data line.
Optionally, the external trigger is a signal generator.
Optionally, the LED lamp is a visible light LED lamp or an infrared LED lamp.
Optionally, the controller includes: a single chip microcomputer;
the input end of the single chip microcomputer is connected with the output end of the external trigger through an external trigger signal data line; the output end of the single chip microcomputer is connected with the control ends of the LED lamps through control data lines.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the camera time synchronization system based on the LED lamp, the controller controls the LED time synchronization lamp panel to display the non-stroboscopic signal with the specific frequency, so that the phenomenon of flickering is avoided, the shape of the LED time synchronization lamp panel can be flexibly designed, the view field area of the camera is reduced as much as possible by the LED time synchronization lamp panel, the brightness of the LED lamp of the LED time synchronization lamp panel is high, the camera can shoot high-precision and high-resolution signals, and therefore accurate time synchronization among multiple cameras is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a camera timing system based on LED lamps according to the present invention;
fig. 2 is a structural diagram of an LED time-setting lamp panel provided by the present invention.
Description of the symbols:
the LED time-setting lamp comprises a 1-LED time-setting lamp panel, a 2-controller, a 3-LED lamp, a 4-external trigger, a 5-control data line and a 6-external trigger signal data line.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a camera time synchronization system based on an LED lamp, which realizes accurate time synchronization among a plurality of cameras.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a structural diagram of a camera time setting system based on an LED lamp according to an embodiment of the present invention, and as shown in fig. 1, a camera time setting system based on an LED lamp includes: the LED time setting lamp comprises an LED time setting lamp panel 1 and a controller 2;
the LED time-setting lamp panel 1 includes a plurality of LED lamps 3.
The output end of the controller 2 is connected with the control ends of the LED lamps 3 through a control data line 5; the controller 2 is used for generating non-stroboscopic pulse signals with different frequencies, transmitting the non-stroboscopic pulse signals to the LED lamps 3 through the control data line 5, and controlling the states of the LED lamps 3.
The LED time-tick lamp panel 1 is shot by a plurality of cameras at the same time and is used for realizing time proofreading during image processing. The LED lamp 3 has the advantages of high brightness, wide spectrum and small volume. The LED lamp 3 can realize several times or even dozens of times of luminous intensity under the same power consumption, and is more beneficial to high-speed camera shooting.
The LED lamp 3 may be a visible light LED lamp or an infrared LED lamp. When the visible light LED lamp and the infrared LED lamp are used in a combined mode, the combined time synchronization of the visible light camera and the infrared camera is achieved, the difficult problem of time synchronization of the visible light camera and the infrared camera is solved, and the better expansibility of the invention is embodied.
LED time to lamp panel 1 still includes: a PCB board; a plurality of LED lamps 3 are fixed on the PCB board.
As shown in fig. 2, the shape of the LED pair lamp panel 1 and the arrangement of the LED lamps 3 provided by the embodiment of the invention can be flexibly designed according to experimental and research requirements, and can be processed into different shapes, for example, there are 16 LED lamps, which can be designed into different arrangements such as 1x16, 2x8, or 4x 4. In the process of developing experimental research, in order to utilize the resolution of the camera as much as possible, the view field is often very limited, so that the time synchronization equipment needs to shield the sample as little as possible, and the area of the LED time synchronization lamp panel 1 provided by the invention can be very small, and the view field of the camera is occupied as little as possible while the time synchronization is realized.
As a preferred embodiment, but not limited to this embodiment, the time synchronization system of the present invention further includes: an external trigger 4; the output end of the external trigger 4 is connected with the input end of the controller 2 through an external trigger signal data line 6; the external trigger 4 is used for generating an external pulse signal and transmitting the external pulse signal to the controller 2; the controller 2 is also used for converting an external pulse signal into an external non-stroboscopic pulse signal, transmitting the external non-stroboscopic pulse signal to the plurality of LED lamps 3, and controlling the states of the plurality of LED lamps 3 through the control data line 5. Preferably, the external trigger 4 is a signal generator. The external trigger 4 can realize external trigger starting, and is beneficial to increasing the universality of the system. The external trigger 4 can also be connected with a data acquisition unit, the data acquisition unit comprises a strain acquisition unit, an acoustic emission acquisition unit, a pressure acquisition unit and the like, the external trigger 4 generates pulse signals and synchronously transmits the pulse signals to each system (a camera time synchronization device, a strain gauge, an acoustic emission instrument and the like) in a multipath manner, the multipath synchronous transmission is equivalent to broadcasting the pulse signals, each system starts to work after receiving the pulse signals, and therefore the time synchronization between the camera and each acquisition system is realized.
The controller 2 includes: a single chip microcomputer; the input end of the single chip microcomputer is connected with the output end of the external trigger 4 through an external trigger signal data line 6; the output end of the singlechip is connected with the control ends of the LED lamps 3 through a control data line 5. The single chip microcomputer has stable oscillation period, the oscillation frequency can reach one megahertz to dozens megahertz, the programming design is convenient, the size is small, no stroboscopic signals can be generated, the frequency can be changed by frequency division and frequency doubling technologies, the frequency range of the invention is greatly increased, and the camera time synchronization system based on the LED lamp can be suitable for time synchronization of cameras with various speeds.
Preferably, the pulse signal of the system can be controlled by programming according to needs, and the simplest scheme is that a programmed digital accumulator is used, each LED lamp is used as a binary bit, and the sum of digital accumulation at a specific frequency is displayed, so that the effect of an electronic clock is realized. The programmed digital accumulator is used for controlling the brightness and the non-brightness of the LED, so that the identification in the digital image at the later stage is convenient, the brightness of a fixed position in the image is very easy to detect, any complex image processing algorithm is not needed, and the time information is easy to extract from the image.
In the application process of the camera time synchronization system based on the LED lamp, provided by the embodiment of the invention, a plurality of cameras simultaneously shoot one LED time synchronization lamp panel (such as a high-speed camera, a common commercial single-lens reflex camera and an infrared camera, and one LED time synchronization lamp panel is shot simultaneously), so that each camera can conveniently and directly shoot the same time information, the time synchronization (time correction) purpose is realized, and errors possibly introduced by a complex time synchronization system are avoided.
The camera time synchronization system based on the LED lamp provided by the embodiment of the invention has the advantages of simple structure, simple principle and convenience in realization, and the display of the LED lamp is controlled by using the single chip as a non-stroboscopic and frequency-stable signal source, so that the accurate time synchronization among a plurality of cameras is realized.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. A camera time setting system based on an LED lamp is characterized in that the time setting system comprises: the LED time setting lamp comprises an LED time setting lamp panel, a controller and an external trigger;
the LED time setting lamp panel comprises a plurality of LED lamps;
the output end of the controller is connected with the control ends of the LED lamps through a control data line; the controller is used for generating non-stroboscopic pulse signals with different frequencies, transmitting the non-stroboscopic pulse signals to the plurality of LED lamps through the control data line and controlling the states of the plurality of LED lamps;
the plurality of cameras shoot the LED time-setting lamp panels at the same time and are used for realizing time correction during image processing;
the output end of the external trigger is connected with the input end of the controller through an external trigger signal data line; the external trigger is used for generating an external pulse signal and transmitting the external pulse signal to the controller; the controller is further used for converting the external pulse signal into an external non-stroboscopic pulse signal, transmitting the external non-stroboscopic pulse signal to the LED lamps, and controlling the states of the LED lamps through the control data line.
2. The LED lamp based camera time tick system of claim 1, wherein the LED time tick panel further comprises: a PCB board;
and the LED lamps are fixed on the PCB.
3. The LED lamp based camera to time system of claim 1, wherein the external trigger is a signal generator.
4. The LED lamp based camera to time system as claimed in claim 1, wherein the LED lamp is a visible LED lamp or an infrared LED lamp.
5. The LED lamp based camera to time system of claim 1, wherein the controller comprises: a single chip microcomputer;
the input end of the single chip microcomputer is connected with the output end of the external trigger through an external trigger signal data line; the output end of the single chip microcomputer is connected with the control ends of the LED lamps through control data lines.
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| CN112153372B (en) * | 2020-09-04 | 2022-04-29 | 合肥富煌君达高科信息技术有限公司 | Precision-controllable synchronous error measurement system for multiple high-speed cameras |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103792841A (en) * | 2014-01-23 | 2014-05-14 | 中国科学院长春光学精密机械与物理研究所 | Image time hack information generating system of space camera |
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| US20050151849A1 (en) * | 2004-01-13 | 2005-07-14 | Andrew Fitzhugh | Method and system for image driven clock synchronization |
| CN102997898B (en) * | 2011-09-16 | 2015-07-08 | 首都师范大学 | Time synchronization control method and system |
| CN104296727B (en) * | 2014-10-10 | 2016-07-06 | 中国科学院长春光学精密机械与物理研究所 | The method for synchronizing time of LMCCD camera and synchro system |
| CN104301719B (en) * | 2014-10-29 | 2016-04-20 | 北京理工大学 | Correct the system of synchronousness in multiple stage high speed camera combined measurement system |
| CN107187464B (en) * | 2017-05-18 | 2023-09-12 | 武汉汉宁轨道交通技术有限公司 | Track slab detection vehicle, system and method |
| CN108259776B (en) * | 2018-04-08 | 2020-07-28 | 乐山师范学院 | Multi-angle collection light supplement device for image processing |
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| CN103792841A (en) * | 2014-01-23 | 2014-05-14 | 中国科学院长春光学精密机械与物理研究所 | Image time hack information generating system of space camera |
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