CN104820338B - A kind of camera shutter delay time measurement device and method - Google Patents
A kind of camera shutter delay time measurement device and method Download PDFInfo
- Publication number
- CN104820338B CN104820338B CN201510219198.7A CN201510219198A CN104820338B CN 104820338 B CN104820338 B CN 104820338B CN 201510219198 A CN201510219198 A CN 201510219198A CN 104820338 B CN104820338 B CN 104820338B
- Authority
- CN
- China
- Prior art keywords
- camera
- display
- shutter
- delay time
- counter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Indication In Cameras, And Counting Of Exposures (AREA)
- Exposure Control For Cameras (AREA)
Abstract
The present invention provides a kind of camera shutter delay time measurement device and method, the shutter control line of single-chip microcomputer, display and camera is set, single-chip microcomputer connects the shutter control line of display and camera respectively, and display is placed in the viewfinder range of camera, and the single-chip microcomputer performs flow：Step 1, counter is started, the accumulation result output display of counter is over the display；Step 2, delay waits camera to be ready to；Step 3, judge whether and reach default pendulous frequency, be then power cut-off, otherwise reset count device, sends exposure instruction so that camera shoots display and obtains the camera current shutter delay time by shutter control line to camera, step 2 is then back to, until reaching pendulous frequency.Camera shutter delay time parameter can be quickly and accurately measured using technical solution of the present invention, it is ensured that subsequent images data processing accuracy.
Description
Technical field
The invention belongs to photography, the more particularly to camera for aerophotogrammetry or traditional photography measurement is fast
Gate delay time measurement device and method.
Background technology
Camera shutter postpones（Otherwise referred to as shutter is sluggish, shutter time lag）It is an important parameter of camera, this ginseng
Number reacted camera after shutter is pressed to the processing speed after the completion of photograph taking.In being normally applied, the influence of this parameter
Candid photograph speed, particularly in motion photography, if the shutter delay time is longer, can miss camera meeting.And in photography
In survey engineering, particularly field of aerial photography measurement is developed rapidly in recent years（Especially unmanned plane, including rotor craft or
Person's Fixed Wing AirVehicle hangs over photographic equipment）, the importance of camera shutter delay parameter highlights.Because being surveyed in aeroplane photography
In amount, for the processing of later data（Splicing, modeling, identification etc.）, it is necessary to which location equipment, time control apparatus and photography are set
Standby connection, to obtain position of aircraft, posture and the temporal information of photograph shooting time, and due to depositing that camera shutter postpones
So that this corresponding relation shifts.For example on 100km/h carrier, if camera shutter delay is 100ms,
The offset of positional information can just reach 2.8m, along with because attitude information mistake, meeting caused by positional information mistake
The problem of bigger is brought to the post-processing of photograph.
If a kind of equipment, it can quickly and accurately measure camera shutter delay time parameter, then can be by this parameter
Data processing is added to as systematic error, then can effectively weaken or eliminate this problem so that at the data in later stage
Reason is easier, accurate.But, not yet there is the relevant device for being capable of practice to occur at present.
The content of the invention
The present invention is precisely in order to solve the above problems, with a kind of device easy to operate, accurate, the quick, measurement of batch
The shutter delay time of camera.
Technical scheme provides a kind of camera shutter delay time measurement device, including single-chip microcomputer, display and
The shutter control line of camera, single-chip microcomputer connects the shutter control line of display and camera respectively, and display is placed in finding a view for camera
In the range of,
Set in the single-chip microcomputer with lower unit,
Counter unit, for starting counter, the accumulation result output display of counter is over the display；
Delay cell, for postponing to wait camera to be ready to；
Judge module is shot, for judging whether and reaching default pendulous frequency, is then power cut-off, otherwise resets
Counter, exposure instruction is sent by shutter control line to camera so that camera shoots display and obtains current fast of the camera
Gate delay time, then command counter cell operation, until reaching pendulous frequency.
Moreover, the display is using four seven segmentation light-emitting diode displays.
Moreover, the counter is counted with 1ms intervals.
Moreover, many cameras to be measured are connected into single-chip microcomputer by shutter control line simultaneously.
The present invention accordingly provides a kind of camera shutter delay time determining method, sets single-chip microcomputer, display and camera
Shutter control line, single-chip microcomputer connects the shutter control line of display and camera respectively, and display is placed in the viewfinder range of camera
It is interior,
The single-chip microcomputer performs below scheme,
Step 1, counter is started, the accumulation result output display of counter is over the display；
Step 2, delay waits camera to be ready to；
Step 3, judge whether and reach default pendulous frequency, be then power cut-off, otherwise reset count device, passes through
Shutter control line sends exposure instruction to camera so that camera shoots display and obtains the camera current shutter delay time,
Step 2 is then back to, until reaching pendulous frequency.
Moreover, the display is using four seven segmentation light-emitting diode displays.
Moreover, the counter is counted with 1ms intervals.
Moreover, many cameras to be measured are connected into single-chip microcomputer by shutter control line simultaneously, single-chip microcomputer measures many simultaneously
The shutter delay time of individual camera.
Apparatus of the present invention can automatically control camera and shoot several photos, support to eliminate random by the method averaged
Error, can quickly and accurately measure camera shutter delay time parameter, it is ensured that subsequent images data processing accuracy；Also,
Measurement scheme proposed by the present invention is suitable to measure single camera, also supports simultaneously to measure multiple cameras, speed
Degree is fast, efficiency high.The apparatus structure of the present invention is ingenious, it is easy to accomplish, it is with low cost, suitable for promoting the use of.
Brief description of the drawings
Fig. 1 is structure chart of the embodiment of the present invention；
Fig. 2 is single-chip microcomputer flow chart of the embodiment of the present invention.
Embodiment
Technical solution of the present invention is specifically described below in conjunction with drawings and examples.
Referring to Fig. 1, the embodiment of the present invention, which provides device, includes a single-chip microcomputer（MCU）, light-emitting diode display and a shutter
Control line.Singlechip chip is provided with multiple GPIO pins, i.e. universal input-output pin GPIO0 ~ 12, and INT pins,
That is external interrupt pin.
Single-chip microcomputer is connected by GPIO pin GPIO0 ~ 11 with light-emitting diode display, when it is implemented, middle can be set suitably
Current-limiting resistance.
Single-chip microcomputer is connected by the shutter control line of GPIO pin GPIO12 and camera.Before measurement, camera is first adjusted
Find a view so that be clear that LED displays, i.e. LED displays need to be placed in the viewfinder range of camera.Specific implementation
When, multiple cameras can be connected simultaneously, you can while multiple cameras are controlled, while measuring the shutter delay time of multiple cameras.
Further, it is also possible to set a starting switch, it is connected on INT pins, to carry out start-up operation.Specific implementation
When, starting switch can be integrally disposed at single-chip microcomputer.
The major part that embodiment provides device is single-chip microcomputer, the single-chip microcomputer on the one hand exposure of control camera shutter, one
Aspect controls a fast aging device, and shows timing result on seven sections of light-emitting diode displays of giant-screen.Based on monolithic
Machine, it is possible to achieve with predetermined time interval（Such as 1ms, is easy to timing statisticses）Tally function is carried out, meter is shown over the display
Number result, it is possible to while camera exposure is controlled, counter is resetted（Zero setting is simultaneously started counting up again）.
Before test, the shutter of camera to be tested and single-chip microcomputer are attached first, can be by order to quickly test
Many cameras to be measured are connected to single-chip microcomputer by shutter control line simultaneously, and camera lens then are directed at into light-emitting diode display, if any must
Will, it may be determined that good focal length.Then starting switch is pressed, now, single-chip microcomputer control light-emitting diode display circulation shows that ms is counted, and
Control camera shutter is exposed action at certain intervals.While exposure instruction is sent to camera, reset count device（Timing
Device zero setting）, so, the timer show value taken by each camera is the shutter delay time of the camera, can be with
Multiple cameras are measured simultaneously.
When it is implemented, can automatically control camera shoots several photos, to support to eliminate by the method averaged
Error immediately.Only need after operation, repeatedly exposure instruction to be sent to camera at a certain time interval, while counter is carried out
Reset（Zero setting is simultaneously started counting up again）.The numerical value now shown on the device taken by camera is exactly the shutter of the camera
Time delay（Unit is ms）.
Display device has multiple choices such as LED and LCD, if it is contemplated that clear, accurate photograph shown number
Value, the time for exposure must be very short（Through experiment, the time for exposure, 1/500s was the most suitable）, therefore display device must it is bright enough and
Response time must be short enough.By contrast, LED response frequency equivalent to low frequency diode response frequency, it is typically all high
In 1Mhz, being converted into the response time is just less than 1 delicate, much smaller than the shutter delay time measured in the present apparatus, is suitable for
The present invention.And LCD response time is Millisecond, with the measured shutter delay time in an order of magnitude, therefore be not suitable for.
Therefore embodiment selection uses seven sections of light-emitting diode displays of giant-screen.When it is implemented, those skilled in the art can be voluntarily from specific
LED device.
The single-chip microcomputer of embodiment is implemented as follows function：
After detecting starting switch and pressing（Down trigger）, a counter is started, then with 1ms rate delivery
Plus, and accumulation result is included in seven segmentation LED screens.Wait after one default time（General camera needs several seconds）,
The GPIO pins level upset of control connection camera shutter（Generally high level is set to low level）, while by counter resets
（Restart after zero setting）, now because camera detects the change of cable release level, exposure actions are initially entered, a photograph is taken
Piece.Recorded on photo now be exactly the camera shutter action when, the Counter Value that LED screen is shown, that is, the phase
The shutter delay time of machine.In order to eliminate random error, the device is waiting the default time（Typically need for several seconds etc.
Treat that camera is ready to）Afterwards, it can repeat to send exposure instruction to camera, while reset count device, multiple measured values are gathered for user
To eliminate random error with the method averaged.Referring to Fig. 2, flow may be designed as：
Step 1, flow starts, and starts counter, the accumulation result output display of counter is in seven segmentation LED screens；
Step 2, delay waits camera to be ready to；
Step 3, judge whether and reach default pendulous frequency, be to terminate flow, otherwise reset count device, passes through
Shutter control line sends exposure instruction to camera so that camera shoots display and obtains the camera current shutter delay time,
Step 2 is then back to, until reaching pendulous frequency.
When it is implemented, can be realized using modular mode：
Set in the single-chip microcomputer with lower unit,
Counter unit, for starting counter, the accumulation result output display of counter is over the display；
Delay cell, for postponing to wait camera to be ready to；
Judge module is shot, for judging whether and reaching default pendulous frequency, is then power cut-off, otherwise resets
Counter, exposure instruction is sent by shutter control line to camera so that camera shoots display and obtains current fast of the camera
Gate delay time, then command counter cell operation, until reaching pendulous frequency.
When it is implemented, the time that those skilled in the art can voluntarily preset the value of pendulous frequency and postpone to wait is long
Degree.Obtain after the shutter delay time repeatedly obtained by measurement, final result can be obtained by being simply averaging.It can extend
Follow-up automatic processing device, for example, set computer, photograph shooting result is inputted automatic identification display is carried out after computer
Upper numerical value and averaging computing, realize full-automatic measurement.
The camera of shutter delay time is announced through some officials of actual test, the result that the present apparatus is measured is public with official
The result uniformity of cloth is fine.Certain slr camera of such as Nikon, the shutter delay time that official announces is 40ms, and this dress
It is 43ms to put and measure obtained result.
Above example will be helpful to those skilled in the art and further understand the present invention, but not limit in any form
The present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, also
Several modifications and improvements can be made.These belong to protection scope of the present invention.
Claims (8)
1. a kind of camera shutter delay time measurement device, it is characterised in that：Surveyed for aerophotogrammetry or traditional photography
Amount, includes the shutter control line of single-chip microcomputer, display and camera, and single-chip microcomputer connects display and camera by GPIO pin respectively
Shutter control line, display is placed in the viewfinder range of camera, and sets a starting switch to be connected to the INT pipes of single-chip microcomputer
On pin；
Set in the single-chip microcomputer with lower unit,
Counter unit, for supporting after detecting starting switch and pressing, starts counter, the accumulation result of counter is exported
Over the display, the accumulation result of counter is shown in the viewfinder range of camera through display for display；
Delay cell, for postponing to wait camera to be ready to；
Judge module is shot, is then power cut-off for judging whether and reaching default pendulous frequency, supports that collection is multiple
Measured value, random error is eliminated with the mode averaged；Otherwise reset count device, controls the GPIO pipes of connection camera shutter
Pin level is overturn, and sends exposure instruction to camera by shutter control line, camera detects the change of cable release level, initially entered
Exposure actions, take a photo so that camera shoots display, shoots what is shown through display in the viewfinder range of camera
The accumulation result of counter, obtains the camera current shutter delay time, then command counter cell operation, until reaching
Pendulous frequency.
2. camera shutter delay time measurement device according to claim 1, it is characterised in that：The display uses four
Seven segmentation light-emitting diode displays.
3. camera shutter delay time measurement device according to claim 1, it is characterised in that：The counter is between 1ms
Every being counted.
4. the camera shutter delay time measurement device according to claim 1 or 2 or 3, it is characterised in that：It is to be measured by many
Camera is connected to single-chip microcomputer by shutter control line simultaneously.
5. a kind of camera shutter delay time determining method, it is characterised in that：Surveyed for aerophotogrammetry or traditional photography
Amount, sets the shutter control line of single-chip microcomputer, display and camera, and single-chip microcomputer connects display and camera by GPIO pin respectively
Shutter control line, display is placed in the viewfinder range of camera, and sets a starting switch to be connected to the INT pipes of single-chip microcomputer
On pin；
The single-chip microcomputer performs below scheme,
Step 1, counter is started, over the display, the accumulation result of counter is through aobvious for the accumulation result output display of counter
Show that device is shown in the viewfinder range of camera；
Step 2, delay waits camera to be ready to；
Step 3, judge whether and reach default pendulous frequency, be then power cut-off, support the multiple measured values of collection, with taking
The mode of average value eliminates random error；Otherwise reset count device, controls the GPIO pins level upset of connection camera shutter,
Exposure instruction is sent to camera by shutter control line, camera detects the change of cable release level, initially enters exposure actions, claps
Next photo so that camera shoots display, shoots the tired of the counter that is shown through display in the viewfinder range of camera
Plus result, the camera current shutter delay time is obtained, step 2 is then back to, until reaching pendulous frequency.
6. camera shutter delay time determining method according to claim 5, it is characterised in that：The display uses four
Seven segmentation light-emitting diode displays.
7. camera shutter delay time determining method according to claim 5, it is characterised in that：The counter is between 1ms
Every being counted.
8. the camera shutter delay time determining method according to claim 5 or 6 or 7, it is characterised in that：It is to be measured by many
Camera is connected to single-chip microcomputer by shutter control line simultaneously, and single-chip microcomputer measures the shutter delay time of multiple cameras simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510219198.7A CN104820338B (en) | 2015-04-30 | 2015-04-30 | A kind of camera shutter delay time measurement device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510219198.7A CN104820338B (en) | 2015-04-30 | 2015-04-30 | A kind of camera shutter delay time measurement device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104820338A CN104820338A (en) | 2015-08-05 |
| CN104820338B true CN104820338B (en) | 2017-10-24 |
Family
ID=53730668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510219198.7A Active CN104820338B (en) | 2015-04-30 | 2015-04-30 | A kind of camera shutter delay time measurement device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104820338B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107566827B (en) * | 2017-07-28 | 2019-06-04 | 腾讯科技（上海）有限公司 | Shoot Delay computing method, device and equipment |
| CN111093021B (en) * | 2018-10-23 | 2021-07-16 | 光速视觉（北京）科技有限公司 | Time domain synchronization method of camera |
| CN111355947A (en) * | 2018-12-24 | 2020-06-30 | 清华大学 | Method for measuring starting time of camera |
| CN111435971B (en) * | 2019-01-15 | 2022-04-08 | 阿里巴巴集团控股有限公司 | Image acquisition parameter configuration method and device, terminal and readable storage medium |
| CN110087062A (en) * | 2019-04-18 | 2019-08-02 | 中北大学 | A kind of high speed camera operating lag test method and system |
| CN110971892B (en) * | 2019-11-27 | 2021-05-11 | 深圳市派科斯科技有限公司 | Exposure delay measuring method, device and storage medium |
| CN113438473B (en) * | 2021-06-25 | 2022-05-10 | 广州极飞科技股份有限公司 | Method and device for testing camera shutter lag time and terminal equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201408324Y (en) * | 2009-04-29 | 2010-02-17 | 重庆师范大学 | Camera shutter test instrument |
| CN103336405A (en) * | 2013-07-09 | 2013-10-02 | 中国科学院光电技术研究所 | Improved shutter delay measurement system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014057654A1 (en) * | 2012-10-12 | 2014-04-17 | セイコーエプソン株式会社 | Method, display device, and device for measuring shutter time lag; method for manufacturing camera; method for measuring camera display delay; and device for measuring display delay |
-
2015
- 2015-04-30 CN CN201510219198.7A patent/CN104820338B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201408324Y (en) * | 2009-04-29 | 2010-02-17 | 重庆师范大学 | Camera shutter test instrument |
| CN103336405A (en) * | 2013-07-09 | 2013-10-02 | 中国科学院光电技术研究所 | Improved shutter delay measurement system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104820338A (en) | 2015-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104820338B (en) | A kind of camera shutter delay time measurement device and method | |
| CN108288044B (en) | Electronic device, face recognition method and related product | |
| CN104301597B (en) | Control system of taking pictures and method | |
| CN105681626B (en) | Detection method, control method, detection device, control device and electronic device | |
| TW200534676A (en) | Test system for portable electronic apparatus and test method there of | |
| KR101322465B1 (en) | Method and apparatus for taking a self camera recording | |
| CN104864866B (en) | Aircraft flight error correction device, antidote and unmanned vehicle | |
| CN107238796A (en) | A kind of maintainability test equipment for wiring board | |
| CN110021158A (en) | A kind of camera shooting meter system and method based on deep learning | |
| CN104333709A (en) | Method, device and electronic equipment for controlling flash lamp | |
| JP2006084556A (en) | Focus detecting device | |
| CN105554400A (en) | Method for achieving automatic jumping photographing through intelligent wristband | |
| WO2016041188A1 (en) | Method and device for determining photographing delay time and photographing apparatus | |
| CN109782459A (en) | Polarizer sheet sticking detection method, device and display device | |
| CN111405272B (en) | Device and method for detecting lost frame and repeated frame of camera | |
| CN102957856A (en) | Camera photographing control method and system | |
| CN110460768B (en) | Electronic device, photographing method, control device, and recording medium | |
| CN114236885B (en) | Electric energy meter liquid crystal display machine vision detection system and method | |
| CN104116505A (en) | Pulse estimation device and pulse estimation program | |
| JP2005354199A5 (en) | ||
| US20120045195A1 (en) | Image pickup apparatus having first and second timers | |
| CN110475075B (en) | Exposure signal feedback system and method and unmanned aerial vehicle | |
| CN114813567A (en) | STM32 chip-based general motion control module for flying-shooting automatic visual equipment | |
| CN104655019B (en) | Critical size measuring method and system | |
| JP3186706U (en) | Leak checker with camera |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |