CN114778076A - Multi-camera synchronism measuring method and device based on nanosecond LED (light emitting diode) running water lamp - Google Patents
Multi-camera synchronism measuring method and device based on nanosecond LED (light emitting diode) running water lamp Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
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- H—ELECTRICITY
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Abstract
The invention relates to a multiphase machine synchronism measuring device based on nanosecond LED (light emitting diode) running light, which comprises a time sequence logic unit, a running light module, a digital display array and a computer, wherein the running light module comprises a plurality of LED lamp beads and the digital display array, the time sequence logic unit outputs control signals to the running light module in parallel through a plurality of IO (input/output) ports, each LED lamp bead has nanosecond rising response time, the response time of the LED lamp bead is set to be less than T nanoseconds, the light emission of the next adjacent lamp bead can be realized within the time interval of the T nanoseconds, and the pre-arranged light-emitting lamp beads keep the light-emitting state; the numerical value displayed by the digital display array represents the number of times that all LED lamp beads in the water lamp module are already lighted; and the computer is used for analyzing and comparing the shot images of the high-speed cameras to realize the synchronism measurement among the high-speed cameras to be measured.
Description
Technical Field
The invention belongs to the technical field of precision measurement and the field of optical engineering, and particularly relates to a nanosecond LED (light emitting diode) running light based multi-camera synchronism measurement method and device.
Background
In recent years, with the continuous improvement of hardware computing capability, the computer vision technology has also been developed rapidly and rapidly, and the computer vision technology is widely applied to various industrial fields, so that the production efficiency is improved, and the human input cost is reduced. Many application scenes are gradually replaced by automatic and intelligent industrial camera detection from the original manual detection, and the application scenes are developing towards the directions of high speed, high precision, large-view detection and the like, so that a plurality of cameras are required to perform cooperative operation according to a certain rule to synchronously acquire images. In the case where the target to be detected is a high-speed object, the cameras need to have a high frame rate, and the final detection accuracy is affected by how well the cameras of the high frame rate are synchronized. At present, in a low-speed scene, a camera acquires the same trigger signal, and the camera can acquiesce to simultaneously acquire images at the same time, so that the problems of difference of intermediate hardware response characteristics and time errors caused by different conversion modes of the trigger signal are ignored. Therefore, under the scene of multi-camera high-speed acquisition, especially when different types of trigger signals or different types of cameras are used, the synchronization verification work among a plurality of cameras has very important practical significance.
The method for verifying the synchronism of the existing commonly used area-array camera is simple and effective, and generally comprises the steps of placing a millisecond-level timer in a common visual field of a plurality of cameras, enabling the cameras to receive synchronous trigger signals, and finishing the synchronism measurement of the area-array camera by directly observing the time difference of the timers in images acquired by different cameras.
However, the method of placing the timer in the common view of the multiple cameras is affected by the refresh rate of the timer display device, and the refresh rate of the conventional display device is only about one hundred, so that the method can only be used for verifying the low-speed acquisition synchronism of the multiple cameras, and it is difficult to ensure that a theoretical accurate image can be obtained during high-speed acquisition. At present, the synchronism verification between the area array high-speed cameras does not have a universal measuring method and a corresponding device.
Disclosure of Invention
The invention aims to provide a multi-camera synchronism measuring device and a measuring method which can realize the synchronism accurate measurement of multi-camera acquisition. The invention realizes the nanosecond LED water lamp based on the sequential logic circuit, performs comparative analysis on nanosecond timestamps obtained by different cameras to be tested, realizes the image acquisition synchronism test among multiple cameras, can eliminate the influence of insufficient refresh rate of the conventional digital display device on the synchronism test, and improves the measurement precision and range. The technical scheme is as follows:
a multiphase machine synchronism measuring device based on nanosecond LED (light emitting diode) running light comprises a time sequence logic unit, a running light module and a computer, wherein the time sequence logic unit is connected with the running light module and comprises a plurality of LED lamp beads and a digital display array, the time sequence logic unit outputs control signals to the running light module in parallel through a plurality of IO (input/output) ports, the control signals drive each LED lamp bead in the running light module, each LED lamp bead has nanosecond rise response time, the response time of the LED lamp bead is set to be smaller than T nanosecond, light is emitted within T nanosecond when an electric signal arrives, the time sequence logic unit generates nanosecond accurate timing through time sequence logic control, the light emission of the next adjacent lamp bead can be realized within the time interval of T nanosecond, and the emitted lamp bead keeps a light emitting state;
the numerical value displayed by the digital display array represents the number of times that all the LED lamp beads in the water lamp module are lightened;
the shot image of the high-speed camera comprises LED lamp beads and a digital display array in the water lamp module;
and the computer is used for analyzing and comparing the shot images of the high-speed cameras, converting the light-emitting number of the LED lamp beads of the water flowing lamp module and the numerical value of the digital display array of the shot images of different high-speed cameras into corresponding time difference values, further obtaining the nanoscale time difference at the actual acquisition time of different high-speed cameras, and comparing and analyzing the light-emitting condition of the LED lamp beads in the water flowing lamp module shot by the high-speed camera to be detected and the numerical value of the digital display array to realize the synchronization measurement among the high-speed cameras to be detected.
Furthermore, the sequential logic unit changes the crystal oscillator clock signal through clock frequency division and controls the logic circuit through the clock signal after frequency division
The working state of the water lamp module is selected, and the sequential logic control method of the water lamp module comprises the following steps:
a. setting a crystal oscillator clock signal of the time sequence logic unit; dividing the frequency of the crystal oscillator clock signal through a counter register;
b. the water lamp state selection register stores decimal serial numbers representing different light emitting conditions of the water lamp module, and an output register of the water lamp state selection register provides selection signals for the light emitting state of the water lamp module to control the on-off state of LED lamp beads in the water lamp module; the pipeline lamp state register is in a set fixed signal mode, multiple different binary values in the pipeline lamp state register represent different light-emitting states of the pipeline lamp module, the next adjacent working state always lightens one LED lamp bead more than the previous working state, the time interval of the two adjacent working states is the time represented by the clock after the frequency division of the crystal oscillator clock signal, and the time represented by the single clock signal after the frequency division is T nanoseconds; in each cycle of the running water lamp module, the lamps which are already lighted in the preamble of the running water lamp LED lamp bead sequence are kept not to be extinguished, and the last running water lamp state signal in the running water lamp state register represents the state that all the running water lamp LEDs emit light;
c. the system reset signal is valid when being 0, namely valid when being low level; the reset signal input end of the register is effective when in a time-effective state, namely effective when in a high level; the system reset signal is connected with the reset signal input ends of the counter register and the running light state selection register, and the reset operation of the counter register and the running light state selection register is controlled; when the system reset signal acts on the counter register, the system reset signal negation and an AND gate output signal of the counter register after a low two-bit output signal passes through an AND gate pass through an OR gate and are output to a reset signal input end of the counter register; when the system reset signal acts on the drain lamp state selection register, the system reset signal is directly connected with a reset signal input port of the drain lamp state selection register, when the system reset signal is effective, the reset zero state of the drain lamp state selection register is kept, at the moment, the drain lamp state selection register cannot receive the result of an adder at the input end of the state selection register, namely, the adder at the input end of the state selection register fails, and the system reset signal is waited for failure; when a system reset signal fails, an adder at the input end of the state selection register starts to work and outputs a signal to an output register of the running water lamp state selection register, wherein the output signal is a final LED state selection signal, and the LED state selection signal selects and outputs a state signal of a running water lamp module in the running water lamp state register through a multi-path selector and is displayed in a light-emitting state of the running water lamp module;
the invention also provides a method for measuring the synchronism of the multiple cameras by using the device, which comprises the following steps:
(1) placing the water lamp module in a common visual field of a plurality of high-speed cameras, and carrying out focusing adjustment on the high-speed cameras to enable the water lamp module to clearly image in the visual field;
(2) synchronous trigger signals of the nanosecond synchronous trigger are transmitted to the high-speed cameras through the trigger signal transmission lines, the high-speed cameras synchronously shoot the LED water lamp modules of the synchronous testing device under the control of the synchronous trigger signals, and images shot by the high-speed cameras are transmitted to the computer;
(3) the computer analyzes and compares the shot images of the high-speed cameras, converts the light-emitting number of the LED lamp beads of the water flowing lamp module and the numerical value of the digital display array of the shot images of different high-speed cameras into corresponding time difference values, further can obtain the nanoscale time difference at the actual acquisition moment of different high-speed cameras, and compares and analyzes the light-emitting condition of the LED lamp beads in the water flowing lamp module shot by the high-speed camera to be detected and the numerical value of the digital display array, so that the synchronism measurement among the high-speed cameras to be detected is realized.
Further, in the step (3), the method for obtaining the nanoscale time difference of the actual acquisition time of the different high-speed cameras is as follows:
a. after the positions of the high-speed camera and the water lamp module are fixed, before the water lamp module is lighted, the high-speed camera is triggered to shoot the non-luminous water lamp module to be used as a reference image. So that the water lamp module works normally. The nanosecond synchronous trigger transmits the synchronous trigger signal to external trigger signal receiving ends of the plurality of high-speed cameras, so that each high-speed camera receiving the external trigger signal can synchronously shoot. And acquiring the light-emitting state of the LED lamp beads and the numerical value of the numerical display array in the water lamp module image synchronously acquired by different high-speed cameras, and comparing the light-emitting state with the reference image of the non-electrified water lamp module shot before to acquire the light-emitting number of the LED lamp beads and the numerical value of the numerical display array corresponding to the acquired image.
b. Calculating a nanosecond timestamp at the acquisition moment of the high-speed camera, wherein the nanosecond timestamp refers to an accumulated result of lighting time intervals of LED lamp beads, N is the total number of the LED lamp beads in the water lamp module, and if the difference value of the lighting numbers of the LED lamp beads displayed in the water lamp module acquired by different high-speed cameras is N and the digital difference value of the digital display array is k, the synchronous acquisition time difference of different high-speed cameras is accumulated from 0 nanosecond to T x k + T (N +1) nanosecond; as the numerical array value increases, the corresponding time measurement interval also increases.
The invention has the following beneficial effects:
(1) the nanosecond LED running water lamp multi-camera synchronism measuring device based on the sequential logic circuit is flexible in arrangement, suitable for accurate measurement of camera acquisition synchronism under different visual fields and angles and wide in application scene;
(2) the invention provides a method for measuring the synchronism of multiple cameras of a nanosecond LED (light-emitting diode) running light based on a sequential logic circuit, which is used for carrying out comparative analysis on nanosecond timestamps obtained by different cameras to be measured so as to realize the measurement of the image acquisition synchronism among the multiple cameras and is suitable for the accurate measurement of the acquisition synchronism among various high-speed cameras;
(3) the invention provides a method for measuring the synchronism of multiple cameras by a running water lamp, which eliminates the influence of insufficient refresh rate of a common digital display device on synchronism measurement and improves the measurement precision and range.
Drawings
Fig. 1 is a schematic diagram of multi-camera synchronous testing of a running light of the present invention.
Fig. 2 is a schematic diagram of sequential logic control of a FPGA for a water lamp according to the present invention.
In fig. 1: 1 is a power supply; 2 is a sequential logic unit; 3 is a water lamp module; 4 is a high-speed camera; 5 is a nanosecond synchronous trigger; 6 is a network switch; and 7 is a PC storage unit.
In fig. 2: 8 is a system reset signal; 9 is a crystal oscillator clock signal; 10 is a counter register; 11 is the output signal of the counter register; 12 is the adder at the input end of the counter register; 13 is an AND gate; 14 is an OR gate; 15 is the reset signal end of the counter register; 16 is the output signal of the AND gate; 17 is an adder at the input end of the state selection register; 18 is a running light state selection register; 19 is the output register of the running light state selection register; 20 is a water lamp status register; 21 is a multiplexer.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description. The best mode is composed of the following parts:
the first part provides a nanosecond LED running water lamp multi-camera synchronism measuring device based on a sequential logic circuit;
the invention discloses a nanosecond LED water lamp multi-camera synchronism measuring device based on a sequential logic circuit, which comprises a power supply 1, a sequential logic unit 2 and a water lamp module 3. The sequential logic unit of the embodiment is implemented by using an FPGA development board. The sequential logic unit 2 is connected with the water lamp module 3, the power supply 1 supplies power to the sequential logic unit 2 through a power supply transmission line, the water lamp module 3 comprises a plurality of LED lamp beads and a digital display array, the sequential logic unit 2 outputs control signals to the water lamp module 3 in parallel through a plurality of IO ports, the control signals drive each LED lamp bead of the water lamp module 3, each LED lamp bead has a rising response time less than 30 nanoseconds, the LED lamp beads emit light within 30 nanoseconds when electric signals arrive, the sequential logic unit generates nanosecond-level accurate timing through sequential logic control, the adjacent next lamp bead can emit light within 30 nanoseconds, the pre-emitted lamp bead keeps a light-emitting state, the influence of overlong response time of the LED lamp beads on the light-emitting condition of the whole water lamp is avoided, and the numerical value displayed by the digital display array represents the number of times that all the LED lamp beads in the water lamp module are already lighted, the method can realize the synchronism test of the LED water lamp module within a longer time range.
A second part, which provides a multi-camera synchronism measuring method aiming at the measuring device structure of the first part;
referring to fig. 1, a flow lamp multi-camera synchronous measurement schematic diagram. The power supply 1, the sequential logic unit 2 and the water lamp module 3 form a synchronous testing device, the whole synchronous testing device is placed in a common visual field of a plurality of high-speed cameras 4, and the high-speed cameras 4 are focused and adjusted to form clear images in the visual field. Synchronous trigger signals of the nanosecond synchronous trigger 5 are transmitted to the high-speed cameras 4, the high-speed cameras 4 synchronously shoot the LED running water lamp module 3 of the synchronous testing device under the control of the multichannel synchronous trigger signals, shot images are transmitted to the network switch 6 through a ten-thousand-million network cable, and then the network switch 6 transmits the shot images to the PC storage unit 7 through the ten-thousand-million network cable. The images shot by the high-speed cameras 4 in the PC storage unit 7 are analyzed and compared, the number of the LED lamp beads in the water lamp module 3 of the images shot by the different high-speed cameras 4 is converted into corresponding time difference values, so that the nanoscale time difference at the actual acquisition time of the different high-speed cameras 4 can be obtained, the LED lamp bead lighting conditions in the water lamp module 3 shot by the high-speed camera 4 to be detected are compared and analyzed, and the synchronism measurement among the high-speed cameras 4 to be detected is realized.
The multi-camera synchronism measurement comprises synchronous shooting and acquisition of a nanosecond LED water lamp and calculation of a camera acquisition time stamp, and is realized by the following steps:
a. after the positions of the high-speed camera 4 and the water lamp module 3 are fixed, before the water lamp module 3 is lighted, the high-speed camera 4 is triggered to shoot the non-luminous water lamp module 3 as a reference image. Then, the power supply of the synchronous testing device is turned on, so that the water lamp module 3 works normally. The nanosecond synchronous trigger 5 transmits the synchronous trigger signal to the external trigger signal receiving ends of the plurality of high-speed cameras 4 through the trigger signal transmission line, so that each high-speed camera 4 receiving the external trigger signal performs synchronous shooting. And acquiring the light emitting state of the LED lamp beads and the numerical value of the digital display array in the images of the water lamp module 3 acquired by the different high-speed cameras 4 synchronously, and comparing the light emitting state with the reference image of the previously shot non-electrified water lamp module 3 to acquire the light emitting number of the LED lamp beads and the numerical value of the digital display array corresponding to the acquired images.
b. The timestamp calculation of the acquisition time of the high-speed camera 4 is carried out, the nanosecond timestamp is an accumulated result of the lighting time intervals of the LED lamp beads and is the problem of different time intervals represented by different numbers of luminous LED lamp beads, N is the total number of the LED lamp beads in the running water lamp module 3, if the difference value of the luminous numbers of the LED lamp beads displayed in the running water lamp module 3 acquired by the different high-speed cameras 4 is N, and the digital difference value of the digital display array is k, the synchronous delay time nanosecond timestamp is accumulated from 0 nanosecond to 30 k (N +1) +30 (N +1) nanoseconds. In addition, as the numerical array value increases, the corresponding time measurement interval also increases.
A third part, which provides a sequential logic control method for the water lamp module of the first part;
the sequential logic unit changes the crystal oscillator clock signal through clock frequency division, and then selects the working state of the pipeline lamp module through the clock signal control logic circuit after frequency division, as shown in fig. 2, which is a sequential logic control schematic diagram of the pipeline lamp. The sequential logic control method is realized by the following steps:
a. the crystal clock signal 9 of the sequential logic unit 2 is set to 100 MHz. The crystal oscillator clock signal 9 is divided into three parts by a counter register 10, the counter register 10 is composed of two-bit binary numbers, namely, a timer _ cnt [0] and a timer _ cnt [1], only when the timer _ cnt [0] is equal to 0 and the timer _ cnt [1] is equal to 1, an output signal 16 passing through an and gate 13 is at a high level 1, and the output signal 16 passing through the and gate 13 is at a low level 0 in the rest cases, the initial value of the counter register 10 is 01 due to the 1 adding operation of an adder 12, and the zero setting operation of the counter register 10 is performed when the value is 10, the counter register returns to a 00 state, namely, the counter register 10 maintains a cycle value of 01- >10- >00- >01- >10 …, and the process is repeatedly cycled, so that the three-part operation of the counter register 10 on the crystal oscillator clock signal 9 is completed.
b. The running water lamp state selection register 18 stores decimal serial numbers representing different light emitting conditions of the running water lamp module 3, and the output register 19 of the running water lamp state selection register provides selection signals for the light emitting state of the running water lamp module 3 to control the on-off state of the LED lamp beads in the running water lamp module 3. The water lamp status register 20 is in a set fixed signal mode, multiple different binary values in the water lamp status register 20 represent different light emitting states of the water lamp module 3, an adjacent latter working state is always brighter than the former working state by one LED lamp bead, and the time interval between the two adjacent working states is the time represented by the clock after the frequency division of the crystal oscillator clock signal 9, that is, in the case that the crystal oscillator clock signal 9 is 100M, and in the case that the frequency division is performed by the counter register 10, the time represented by a single clock signal after the frequency division is 30 nanoseconds. In order to eliminate the influence of the turn-off response time of the LED lamp beads, in each cycle of the water lamp module 3, the lamps that have been previously lit in the sequence of the water lamp LED lamp beads are kept from being turned off, that is, the last water lamp status signal in the water lamp status register 20 represents the state that all the water lamp LEDs are lit.
c. The system reset signal 8 is active at 0, i.e., active at low level. The reset signal input terminal of the register is active at 1, i.e., active at high level. The system reset signal 8 is connected to the reset signal input terminals of the counter register 10 and the water lamp status selection register 18, and controls the reset operation of the counter register 10 and the water lamp status selection register 18. When the system reset signal 8 acts on the counter register 10, the system reset signal 8 negates the and gate output signal 16 after the lower two-bit output signal of the counter register 10 passes through the and gate 13, and then the and gate output signal passes through the or gate 14 and is output to the reset signal input end of the counter register 10; when the system reset signal 8 acts on the water lamp state selection register 18, the system reset signal 8 is directly connected with the reset signal input port of the water lamp state selection register 18, when the system reset signal 8 is valid, the reset zero setting state of the water lamp state selection register 18 is maintained, at this time, the water lamp state selection register 18 does not receive the result of the adder 17 at the input end of the state selection register, namely, the adder 17 at the input end of the state selection register fails, and the system reset signal 8 waits for the failure of the system reset signal 8. When the system reset signal 8 fails, the adder 21 at the input end of the state selection register starts to work, and outputs a signal to the output register of the water lamp state selection register, wherein the output signal is the final LED state selection signal, and the LED state selection signal selects and outputs the state signal of the water lamp module 3 in the water lamp state register 20 through the multiplexer 21, so as to change the working state of the water lamp module 3.
Claims (4)
1. A multiphase machine synchronism measuring device based on a nanosecond LED (light emitting diode) running water lamp comprises a time sequence logic unit, a running water lamp module and a computer, wherein the time sequence logic unit is connected with the running water lamp module, the running water lamp module comprises a plurality of LED lamp beads and a digital display array, the time sequence logic unit outputs control signals to the running water lamp module in parallel through a plurality of IO (input/output) ports, the control signals drive each LED lamp bead in the running water lamp module, each LED lamp bead has nanosecond rise response time, the response time of the LED lamp bead is set to be smaller than T nanosecond, light is emitted within T nanosecond when an electric signal arrives, the time sequence logic unit generates nanosecond accurate timing through time sequence logic control, the light emission of the next adjacent lamp bead can be achieved within the time interval of T nanosecond, and the pre-emitted lamp bead keeps a light emitting state;
the numerical value displayed by the digital display array represents the number of times that all the LED lamp beads in the water lamp module are lightened;
the shot image of the high-speed camera comprises LED lamp beads and a digital display array in the water lamp module;
and the computer is used for analyzing and comparing the shot images of the high-speed cameras, converting the light-emitting number of the LED lamp beads in the water flowing lamp module of the shot images of the different high-speed cameras and the numerical value of the digital display array into corresponding time difference values, further obtaining the nanoscale time difference at the actual acquisition time of the different high-speed cameras, comparing and analyzing the light-emitting condition of the LED lamp beads in the water flowing lamp module shot by the high-speed cameras to be detected and the numerical value of the digital display array, and realizing the measurement of the synchronism among the high-speed cameras to be detected.
2. The multi-camera synchronism measurement device based on the nanosecond LED pipeline lamp, according to claim 1, wherein the sequential logic unit changes the crystal oscillator clock signal through clock frequency division, and then selects the working state of the pipeline lamp module through the clock signal control logic circuit after frequency division, and the sequential logic control method of the pipeline lamp module is as follows:
a. setting a crystal oscillator clock signal of the time sequence logic unit; dividing the frequency of the crystal oscillator clock signal through a counter register;
b. the output register of the running water lamp state selection register provides selection signals for the light-emitting state of the running water lamp module and controls the on-off state of LED lamp beads in the running water lamp module; the running water lamp state register is in a set fixed signal mode, multiple different binary values in the running water lamp state register represent different light-emitting states of the running water lamp module, the adjacent latter working state is always brighter than the former working state by one LED lamp bead, the time interval of the adjacent two working states is the time represented by the clock after the frequency division of the crystal oscillator clock signal, and the time represented by the single clock signal after the frequency division is T nanoseconds; in each cycle of the running water lamp module, the lamps which are lighted in the preorders of the running water lamp LED lamp bead sequence are not extinguished, and the last running water lamp state signal in the running water lamp state register represents the state that all the running water lamps LED emit light;
c. the system reset signal is active at 0, i.e. active at low level; the reset signal input end of the register is effective when in a time-effective state, namely effective when in a high level; the system reset signal is connected with the reset signal input ends of the counter register and the running light state selection register, and the reset operation of the counter register and the running light state selection register is controlled; when the system reset signal acts on the counter register, the system reset signal is negated, and an AND gate output signal of the counter register after a low two-bit output signal passes through the AND gate passes through the OR gate and is output to a reset signal input end of the counter register; when the system reset signal acts on the pipeline lamp state selection register, the system reset signal is directly connected with a reset signal input port of the pipeline lamp state selection register, when the system reset signal is effective, the reset zero setting state of the pipeline lamp state selection register is kept, at the moment, the pipeline lamp state selection register cannot receive the result of an adder at the input end of the state selection register, namely, the adder at the input end of the state selection register fails, and the system reset signal is waited to fail; when the system reset signal fails, the adder at the input end of the state selection register starts to work, and outputs a signal to the output register of the water lamp state selection register, wherein the output signal is a final LED state selection signal, and the LED state selection signal selects and outputs a state signal of a water lamp module in the water lamp state register through the multiplexer and is displayed in a light-emitting state of the water lamp module.
3. A method for multi-camera synchronism measurement, implemented by the device of any one of claims 1-2, comprising the steps of:
(1) placing the water lamp module in a common visual field of a plurality of high-speed cameras, and carrying out focusing adjustment on the high-speed cameras to enable the water lamp module to clearly image in the visual field;
(2) synchronous trigger signals of the nanosecond synchronous trigger are transmitted to the high-speed cameras through the trigger signal transmission lines, the high-speed cameras synchronously shoot the LED water lamp modules of the synchronous testing device under the control of the synchronous trigger signals, and images shot by the high-speed cameras are transmitted to the computer;
(3) the computer analyzes and compares the shot images of the high-speed cameras, converts the light-emitting number of the LED lamp beads of the water flowing lamp module and the numerical value of the digital display array of the shot images of different high-speed cameras into corresponding time difference values, further can obtain the nanoscale time difference at the actual acquisition moment of different high-speed cameras, and compares and analyzes the light-emitting condition of the LED lamp beads in the water flowing lamp module shot by the high-speed camera to be detected and the numerical value of the digital display array, so that the synchronism measurement among the high-speed cameras to be detected is realized.
4. The multi-camera synchronization measuring method according to claim 3, wherein in the step (3), the method for obtaining the nanoscale time difference between the actual acquisition moments of the different high-speed cameras is as follows:
a. after the positions of the high-speed camera and the water lamp module are fixed, before the water lamp module is lighted, the high-speed camera is triggered to shoot the non-luminous water lamp module to be used as a reference image. So that the running water lamp module can work normally. The nanosecond synchronous trigger transmits the synchronous trigger signal to external trigger signal receiving ends of the plurality of high-speed cameras, so that each high-speed camera receiving the external trigger signal can synchronously shoot. And acquiring the light-emitting state of the LED lamp beads and the numerical value of the numerical display array in the water lamp module image synchronously acquired by different high-speed cameras, and comparing the light-emitting state with the reference image of the non-electrified water lamp module shot before to acquire the light-emitting number of the LED lamp beads and the numerical value of the numerical display array corresponding to the acquired image.
b. Calculating a nanosecond timestamp at the acquisition moment of the high-speed camera, wherein the nanosecond timestamp refers to an accumulated result of lighting time intervals of LED lamp beads, N is the total number of the LED lamp beads in the water lamp module, and if the difference value of the lighting numbers of the LED lamp beads displayed in the water lamp module acquired by different high-speed cameras is N and the digital difference value of the digital display array is k, the synchronous acquisition time difference of different high-speed cameras is accumulated from 0 nanosecond to T x k + T (N +1) nanosecond; as the numerical array value increases, the corresponding time measurement interval also increases.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115334222A (en) * | 2022-08-16 | 2022-11-11 | 上海研鼎信息技术有限公司 | Shooting control system of camera based on trigger |
| CN117073638A (en) * | 2023-10-12 | 2023-11-17 | 湖南科天健光电技术有限公司 | Visual measurement system and visual measurement method |
-
2022
- 2022-04-13 CN CN202210385735.5A patent/CN114778076A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115334222A (en) * | 2022-08-16 | 2022-11-11 | 上海研鼎信息技术有限公司 | Shooting control system of camera based on trigger |
| CN117073638A (en) * | 2023-10-12 | 2023-11-17 | 湖南科天健光电技术有限公司 | Visual measurement system and visual measurement method |
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