CN107277389B - Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit and method based on FPGA - Google Patents
Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit and method based on FPGA Download PDFInfo
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- CN107277389B CN107277389B CN201710675810.0A CN201710675810A CN107277389B CN 107277389 B CN107277389 B CN 107277389B CN 201710675810 A CN201710675810 A CN 201710675810A CN 107277389 B CN107277389 B CN 107277389B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
- H04N5/067—Arrangements or circuits at the transmitter end
- H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations
- H04N5/0733—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations for distributing synchronisation pulses to different TV cameras
Abstract
The invention discloses a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit and method based on FPGA, circuit includes forward path module, FPGA processing module, power module and clock module, wherein: forward path module, interface channel is provided for each camera, FPGA processing module is connected simultaneously, transmits the triggering command of taking pictures of each camera of acquisition；FPGA processing module, it is taken pictures triggering command according to the camera of acquisition, record the asynchronous time difference of the shutter action of each camera, and calculate synchronization time difference numerical value, according to synchronization time difference numerical value, on the basis of the shutter action signal finally reached, postpone other trigger signals, to generate the synchronous photo taking trigger signal of each camera；Power module provides power supply for FPGA processing module, and clock module is configured as providing high frequency time base clock signal for FPGA processing module.
Description
Technical field
The present invention relates to a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit and method based on FPGA.
Background technique
Travelling shot measures the main sensors according to single digital camera as image capturing, the digitized video of acquisition
The a series of problems such as that there are film sizes is small, image quantity is more, processing time Long baselines are short, height accuracy is low.Although both at home and abroad
Unit such as China Surveying and Mapping Research Academy has developed the DMC of SWDC aviation measuring camera and the dedicated super wide angle combination camera of UAV, the U.S.
Aviation measuring camera, Austria UCD aviation measuring camera, but there are prices it is high, volume is big, structure is complicated, weight weight the problems such as.
Multicamera system is used widely, and compared with one camera, multicamera system can obtain more accurate letter
Breath improves estimator；Closer to the actual size shape of object, reduce most of inherent scale error, more complete 3D vision.
In polyphaser camera work, often requires that more cameras carry out Photographic Study to same target from different directions, sometimes require that
The different physical of same target is obtained, this requires the synchronization between more cameras, can obtain same target not Tongfang
The one-to-one prompting message of position.
Conventional synchronization is that polyphaser controls synchronous exposure using same lock-out pulse, does not consider the mechanical differences of each camera
Property and camera factors such as temperature, humidity and air pressure in complicated working environment cause each camera exposure synchronous error when
Between and dispersibility spatially etc., cause to cannot achieve microsecond rank in 10mS or so using the synchronization exposure error of this method
Within high-precise synchronization exposure.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes a kind of Digital Photogrammetric System polyphaser dynamic synchronization based on FPGA
Exposure circuit and method, the present invention carry out processing to the shutter signal of more cameras and synchronize them photography, guarantee essence when shooting
It is really synchronous, it can guarantee camera while exposing, the coincidence of Shi Ge photo centre, convenient for the splicing and post-processing of more camera images,
Image processing speed can be greatly speeded up, the interior industry time is reduced.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit based on FPGA, including forward path module,
FPGA processing module, power module and clock module, in which:
The forward path module is configured as providing interface channel for each camera, while connecting FPGA processing module,
Transmit the triggering command of taking pictures of each camera of acquisition；
The FPGA processing module, is configured as triggering command of taking pictures according to the camera of acquisition, records the fast of each camera
The asynchronous time difference of door movement, and synchronization time difference numerical value is calculated, according to synchronization time difference numerical value, with the shutter finally reached
On the basis of action signal, postpone other trigger signals, to generate the synchronous photo taking trigger signal of each camera；
Power module provides power supply for FPGA processing module, and clock module is configured as providing high frequency for FPGA processing module
Time base clock signal.
Further, the FPGA processing module, including sequentially connected gate module, timing module, latch module and
Trigger module, after the gate module obtains the triggering command of taking pictures of camera, opening gate according to shutter signal allows timing mould
Block timing, the timing module record the asynchronous time difference of the shutter action of each camera, and latch module records each road camera
Synchronization time difference numerical value, trigger module prolongs on the basis of the shutter action signal finally reached according to synchronization time difference numerical value
Others trigger signal late, to generate the synchronous photo taking trigger signal of each camera.
Further, the clock module connects timing module and latch module by digital phase-locked loop.
Further, the both ends of the latch module are connected with memory module, with store each camera take pictures every time it is same
Walk the time difference.
Further, it is attached between each camera and forward path module by data connecting line.
Further, the forward path module includes amplifying circuit, filter circuit and shaping circuit, respectively to receiving
Camera shutter signal amplify, filter and shaping operation.
Further, the power module includes external power supply and internal battery module, and the external power supply and inside are electric
Pond module connects FPGA processing module by DC-DC module.
By forward path module, each camera and trigger module, cycling circuit is constituted, the bat of each camera is constantly acquired
It according to shutter trigger signal, then synchronizes, to realize that dynamic adjusts synchronous purpose.
Working method based on above system, comprising the following steps:
The triggering command of taking pictures for acquiring each camera takes pictures trigger signal according to the camera of acquisition, records each camera
The asynchronous time of shutter action calculates other cameras and standard shutter is dynamic on the basis of the shutter action signal finally reached
The synchronization time difference numerical value for making the affiliated camera of signal postpones the trigger signal of other camera shutters according to synchronization time difference numerical value,
To generate the synchronous photo taking trigger signal of each camera.
Further, cycle operation is constituted, constantly acquires the space shooting shutter trigger signal of each camera, then synchronize,
To realize that dynamic adjusts synchronous purpose.
Compared with prior art, the invention has the benefit that carrying out processing to the shutter signal of more cameras is allowed to same
Step photography guarantees precise synchronization when shooting, can guarantee camera while exposing, Shi Ge photo centre is overlapped, is convenient for more cameras
The splicing and post-processing of image can greatly speed up image processing speed, reduce the interior industry time.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is conditioning shutter signal circuit diagram of the invention；
Fig. 3 is that the embodiment of the present invention adjusts process schematic；
Fig. 4 is power module detailed maps of the invention.
Wherein, forward path module 1, shutter FPGA signal processing apparatus 2, power supply device 3,20MHz clock 4, storage mould
Block 5, camera 6.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair
Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and indicate may be a fixed connection,
It is also possible to be integrally connected or is detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be,
It is not considered as limiting the invention.
As background technique is introduced, the ineffective deficiency of synchronized-pulse control exists in the prior art, to understand
Technical problem certainly as above, present applicant proposes a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit based on FPGA
And method.
In a kind of typical embodiment of the application, as shown in Figure 1, including forward path module 1, shutter FPGA signal
Processing unit 2, power supply device 3,20MHz clock 4, memory module 5, camera 6；The forward path module 1 and shutter FPGA
Signal processing apparatus 2 connects, and the power supply device 3,20MHz clock 4 are connect with shutter FPGA signal processing apparatus 2, shutter
FPGA signal processing apparatus 2 and memory module 5 are connected with each other, and shutter FPGA signal processing apparatus 2 is connect with camera 6, camera 6 and
Forward path module 1 connects, it is characterised in that: the shutter FPGA signal processing apparatus 2 is by gate module 2-1, timing mould
Block 2-2, latch module 2-3, trigger module 2-4, digital phase-locked loop PLL2-5 composition, forward path module 1 and gate module 2-1
Connection, gate module 2-1 connect with latch module 2-3, and latch module 2-3 is connect with trigger module 2-4, trigger module 2-4 and
Camera 6 connects；The digital phase-locked loop PLL2-5 is connect with timing module 2-2, latch module 2-3 respectively；The latch
The both ends of module 2-3 are connected with memory module 5, and the 20MHz clock 4 is connect with digital phase-locked loop PLL2-5.
It is attached between the camera 6 and forward path module 1 by data connecting line.
The power supply device 3 is made of DC-DC module 3-1, external power supply 3-2, internal electric source 3-3, external power supply 3-
2, internal electric source 3-3 is connect with DC-DC module 3-1.
After the photographing instruction, that is, external trigger for obtaining camera, open gate according to shutter signal allows gate module 2-1
Timing module 2-2 timing；Clocking portions are used to record the asynchronous time difference of each road camera shutter movement；Latch module 2-3 is used
In the synchronization time difference numerical value for keeping in each road camera；Trigger module 2-4 generates the trigger signal of taking pictures of each camera according to the time difference；
Digital phase-locked loop PLL2-5 is used to occur the high frequency time base clock signal of timing 100MHz；Memory module 5 is for storing each phase
The synchronization time difference that machine is taken pictures every time.
The present invention is based on FPGA Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit and methods, comprising:
As shown in Fig. 2, be used to improve shutter signal, receive shutter signal and amplified, filtered and the electricity of shaping
Road.
As shown in figure 3, the shutter signal of more cameras is after the amplification of above-mentioned part, filtering and shaping, into this portion
Point, this part is the processing links based on FPGA: recording multiple shutter signals respectively and reaches the time of this part, and stores
Come；That signal finally reached is found in multiple shutter signals, and on the basis of this signal, obtain this most slow letter respectively
Time difference number with other several signals；The synchronous triggering after postponing the corresponding time difference respectively of the trigger signal on other several roads.Example
As: there are 4 cameras, 4 road shutter signal camera A, B, C and D shown in following, wherein the 4th tunnel is most slow, and on the basis of the 4th tunnel, the 1st
Fast 3 seconds of 4 tunnel Lu Bi, 1 second faster than the 4th tunnel of the 2nd tunnel, 2 seconds faster than the 4th tunnel of the 3rd tunnel；Then the 1st tunnel trigger signal postpones 3 seconds, and the 2nd
Road trigger signal postpones 1 second, and the 3rd tunnel trigger signal postpones 2 seconds, and the 4th tunnel trigger signal is constant.After 4 road shutters are triggered, return
Current multichannel shutter signal, then into above-mentioned amplification shaping unit, prepare adjustment next time.It is adjusted together to reach dynamic
The purpose of step.
As shown in figure 4, power module is used to provide a system to the part of electric energy, conditioning circuit and FPGA two parts are carried out
Power supply.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (8)
1. a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit based on FPGA, it is characterized in that: including forward path
Module, FPGA processing module, power module and clock module, in which:
The forward path module is configured as each camera and provides interface channel, while connecting FPGA processing module, and transmitting is adopted
The triggering command of taking pictures of each camera of collection；
The FPGA processing module, is configured as triggering command of taking pictures according to the camera of acquisition, and the shutter for recording each camera is dynamic
The asynchronous time difference made, and synchronization time difference numerical value is calculated, according to synchronization time difference numerical value, with the shutter action finally reached
On the basis of signal, postpone other trigger signals, to generate the synchronous photo taking trigger signal of each camera；
By forward path module, each camera and trigger module, cycling circuit is constituted, it is fast constantly to acquire taking pictures for each camera
Door trigger signal, then synchronize, to realize that dynamic adjusts synchronous purpose；
Power module provides power supply for FPGA processing module, and clock module is configured as providing high frequency time base for FPGA processing module
Clock signal；
The forward path module includes amplifying circuit, filter circuit and shaping circuit, is believed respectively the camera shutter received
It number amplifies, filter and shaping operation.
2. a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit based on FPGA as described in claim 1, special
Sign is: the FPGA processing module, including sequentially connected gate module, timing module, latch module and trigger module, described
After gate module obtains the triggering command of taking pictures of camera, opening gate according to shutter signal allows timing module timing, the meter
When module record each camera shutter action the asynchronous time difference, latch module records difference synchronization time of each road camera
Value, trigger module is according to synchronization time difference numerical value, on the basis of the shutter action signal finally reached, postpones other triggering letters
Number, to generate the synchronous photo taking trigger signal of each camera.
3. a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit based on FPGA as claimed in claim 2, special
Sign is: the clock module connects timing module and latch module by digital phase-locked loop.
4. a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit based on FPGA as claimed in claim 2, special
Sign is: the both ends of the latch module are connected with memory module, to store the synchronization time difference that each camera is taken pictures every time.
5. a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit based on FPGA as described in claim 1, special
Sign is: being attached between each camera and forward path module by data connecting line.
6. a kind of Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit based on FPGA as described in claim 1, special
Sign is: the power module includes external power supply and internal battery module, and the external power supply and internal battery module pass through
DC-DC module connects FPGA processing module.
7. based on the Digital Photogrammetric System polyphaser dynamic synchronization exposure such as of any of claims 1-6 based on FPGA
The working method of circuit, it is characterized in that: the following steps are included:
The triggering command of taking pictures for acquiring each camera takes pictures trigger signal according to the camera of acquisition, records the shutter of each camera
The asynchronous time of movement calculates other cameras and standard shutter action is believed on the basis of the shutter action signal finally reached
The synchronization time difference numerical value of camera belonging to number postpones the trigger signal of other camera shutters, according to synchronization time difference numerical value with life
At the synchronous photo taking trigger signal of each camera.
8. working method as claimed in claim 7 constantly acquires taking pictures for each camera it is characterized in that: constituting cycle operation
Shutter trigger signal, then synchronize, to realize that dynamic adjusts synchronous purpose.
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| CN201710675810.0A CN107277389B (en) | 2017-08-09 | 2017-08-09 | Digital Photogrammetric System polyphaser dynamic synchronization exposure circuit and method based on FPGA |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110830718B (en) * | 2019-11-12 | 2021-07-20 | 广州极飞科技股份有限公司 | Photographing control method, mapping method and related device |
| CN113519151B (en) * | 2020-02-12 | 2023-06-20 | 深圳元戎启行科技有限公司 | Image acquisition triggering method, device, computer equipment, readable storage medium and monitoring equipment |
| CN111556224B (en) * | 2020-05-20 | 2022-08-05 | 武汉四维图新科技有限公司 | Multi-camera synchronous calibration method, device and system |
| CN111757018A (en) * | 2020-06-22 | 2020-10-09 | 季华实验室 | Camera group synchronous exposure control method and system, computer readable storage medium and camera group control system |
| WO2022141089A1 (en) * | 2020-12-29 | 2022-07-07 | 深圳市大疆创新科技有限公司 | Shutter apparatus and synchronization method and control method therefor, and photographing device |
| CN112953670B (en) * | 2021-01-26 | 2022-06-21 | 中电海康集团有限公司 | Fusion perception synchronous exposure method and device and readable storage medium |
| CN114785326B (en) * | 2022-06-20 | 2023-02-24 | 成都理工大学 | Synchronous triggering system of electricity experiment data recording equipment |
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| CN107018285A (en) * | 2015-09-23 | 2017-08-04 | 三星电子株式会社 | Bi-directional synchronization camera including its camera system and the method for operating camera system |
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