CN104820338A - Measurement apparatus and method of camera shutter delay time - Google Patents
Measurement apparatus and method of camera shutter delay time Download PDFInfo
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- CN104820338A CN104820338A CN201510219198.7A CN201510219198A CN104820338A CN 104820338 A CN104820338 A CN 104820338A CN 201510219198 A CN201510219198 A CN 201510219198A CN 104820338 A CN104820338 A CN 104820338A
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Abstract
Provided in the invention is a measurement apparatus and method of camera shutter delay time. A single-chip microcomputer, a display, and a camera shutter control line are arranged. The single-chip microcomputer I connected with the display and the camera shutter control line; and the display is arranged in a viewfinder range of the camera. The single-chip microcomputer executes the following flow: step one, starting a counter and outputting and displaying an accumulated result of the counter to the display; step two, carrying out delaying to wait for preparation of the camera; and step three, determining whether a preset number of times for measurement is reached; if so, finishing the work; and if not, resetting the counter and sending an exposure instruction to the camera by the shutter control line, thereby enabling the camera to shoot the display to obtain current shutter delay time of the camera; and returning to the step two until reaching the number of times for measurement. On the basis of the technical scheme, the delay time parameter of the camera shutter can be measured rapidly and accurately, thereby guaranteeing accuracy of subsequent image data processing.
Description
Technical field
The invention belongs to photography, particularly relate to the camera shutter delay time measurement device and method measured for photogrammetric measurement or traditional photography.
Background technology
Camera shutter postpones (sometimes sluggish also referred to as shutter, shutter time lag) is an important parameter of camera, this parameter reacted camera complete to photograph taking after shutter is pressed after processing speed.In the general application, this parameter influence candid photograph speed, particularly in motion photography, if the shutter delay time is longer, then can miss camera meeting.And in photogrammetric engineering, particularly field of aerial photography measurement developed (especially unmanned plane, comprises rotor craft or Fixed Wing AirVehicle hangs over photographic equipment) rapidly in recent years, the importance of camera shutter delay parameter highlighted.Because in photogrammetric measurement, in order to the process (splicing, modeling, identification etc.) of late time data, positioning equipment, time control apparatus is needed to be connected with photographic equipment, to obtain the photograph shooting position of aircraft in moment, attitude and temporal information, and due to camera shutter postpone existence, this corresponding relation is offset.Such as on the carrier of 100km/h, if camera shutter postpones to be 100ms, then the side-play amount of positional information just can reach 2.8m, adds the attitude information mistake caused because of positional information mistake, can bring larger problem to the post-processed of photograph.
If there is a kind of equipment, camera shutter delay time parameter can be measured rapidly, exactly, then this parameter can be joined Data processing as systematic error, then effectively can weaken or eliminate this problem, make the data processing in later stage easier, accurate.But, not yet have at present can practice relevant device occur.
Summary of the invention
The present invention just in order to solve the problem, with a kind of device easy and simple to handle, accurately, fast, shutter delay time of the measurement camera of batch.
Technical scheme of the present invention provides a kind of camera shutter delay time measurement device, comprises the shutter control line of single-chip microcomputer, display and camera, and single-chip microcomputer connects the shutter control line of display and camera respectively, and display is placed in the viewfinder range of camera,
Arrange in described single-chip microcomputer with lower unit,
Counter unit, for starting counter, the accumulation result output display of counter is over the display;
For postponing, delay cell, waits for that camera is ready to;
Shooting judge module, for judging whether and reaching default pendulous frequency, it is then power cut-off, otherwise reset counter, exposure instruction is sent by shutter control alignment camera, make camera take display and obtain this camera current shutter delay time, then command counter cell operation, until reach pendulous frequency.
And described display adopts four seven segmentation light-emitting diode displays.
And described counter counts with 1ms interval.
And, camera to be measured for multiple stage is connected to single-chip microcomputer by shutter control line simultaneously.
The present invention is corresponding provides a kind of camera shutter delay time determining method, arranges the shutter control line of single-chip microcomputer, display and camera, and single-chip microcomputer connects the shutter control line of display and camera respectively, and display is placed in the viewfinder range of camera,
Described single-chip microcomputer performs following flow process,
Step 1, start counter, the accumulation result output display of counter is over the display;
Step 2, postpones to wait for that camera is ready to;
Step 3, judges whether and reaches default pendulous frequency, is then power cut-off, otherwise reset counter, sends exposure instruction by shutter control alignment camera, make camera take display and obtain this camera current shutter delay time, then step 2 is returned, until reach pendulous frequency.
And described display adopts four seven segmentation light-emitting diode displays.
And described counter counts with 1ms interval.
And camera to be measured for multiple stage is connected to single-chip microcomputer by shutter control line, and the shutter delay time of multiple camera measured by single-chip microcomputer simultaneously simultaneously.
Apparatus of the present invention automatically can control camera and take several photos, supporting that the method by averaging eliminates stochastic error, can measure camera shutter delay time parameter rapidly, exactly, ensure subsequent images data processing accuracy; Further, namely the measurement scheme that the present invention proposes is suitable for measuring single camera, and also support to measure multiple camera, speed is fast, efficiency is high simultaneously.Apparatus structure of the present invention is ingenious, is easy to realize, with low cost, is suitable for promoting the use of.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention structural drawing;
Fig. 2 is embodiment of the present invention single-chip microcomputer process flow diagram.
Embodiment
Below in conjunction with drawings and Examples, technical solution of the present invention is specifically described.
See Fig. 1, embodiment of the present invention institute generator comprises a single-chip microcomputer (MCU), a light-emitting diode display and shutter control line.Singlechip chip is provided with multiple GPIO pin, i.e. universal input-output pin GPIO0 ~ 12, and INT pin, i.e. external interrupt pin.
Single-chip microcomputer is connected with light-emitting diode display by GPIO pin GPIO0 ~ 11, and when specifically implementing, centre can arrange suitable current-limiting resistance.
Single-chip microcomputer is connected with the shutter control line of camera by GPIO pin GPIO12.Before measurement, first adjust the finding a view of camera, make it possible to clearly see LED display, namely LED display need be placed in the viewfinder range of camera.During concrete enforcement, multiple camera can be connected simultaneously, multiple camera can be controlled simultaneously, measure the shutter delay time of multiple camera simultaneously.
In addition, a starting switch can also be set, receive on INT pin, to carry out start-up operation.During concrete enforcement, single-chip microcomputer place can be arranged on by integrated for starting switch.
The major part of embodiment institute generator is single-chip microcomputer, and this single-chip microcomputer controls camera shutter exposure on the one hand, controls a fast aging device on the one hand, and timing result is shown on giant-screen seven sections of light-emitting diode displays.Based on single-chip microcomputer, can realize carrying out tally function with predetermined time interval (such as 1ms, is convenient to timing statistics), show count results over the display, and while control camera exposure, counter can be carried out reset (zero setting also restarts counting).
Before test, first the shutter of camera to be tested is connected with single-chip microcomputer, in order to quick test, camera to be measured for multiple stage can be connected to single-chip microcomputer by shutter control line simultaneously, then camera lens is aimed at light-emitting diode display, if necessary, can focal length be determined.Then press starting switch, now, Single-chip Controlling light-emitting diode display Circulating fibrocytes ms counts, and control camera shutter carries out exposure actions at certain intervals.While send exposure instruction to camera, reset counter (timer zero setting), so, the timer displayed value taken by each camera is the shutter delay time of this camera, can measure multiple camera simultaneously.
During concrete enforcement, automatically can control camera and take several photos, to support that the method by averaging eliminates error immediately.Only need after operation, repeatedly send exposure instruction to camera at a certain time interval, counter is carried out reset (zero setting also restarts counting) simultaneously.The numerical value that this device now taken by camera shows is exactly the shutter delay time (unit is ms) of this camera.
Display device has multiple choices as LED and LCD, but consider if clear, accurately photograph shown numerical value, time shutter must very short (through experiment, time shutter 1/500s be the most suitable), and therefore display device is sufficiently bright and the response time is sufficiently short.By contrast, the response frequency of LED is equivalent to the response frequency of low frequency diode, and generally all higher than 1Mhz, being converted into the response time is less than 1 delicate exactly, the shutter delay time measured in this device, is suitable for the present invention.And the response time of LCD is Millisecond, with the measured shutter delay time at an order of magnitude, therefore be not suitable for.Therefore embodiment is selected to adopt giant-screen seven sections of light-emitting diode displays.During concrete enforcement, those skilled in the art can select concrete LED device voluntarily.
The single-chip microcomputer of embodiment is implemented as follows function:
When detect starting switch press after (down trigger), counter is started, then progressively increases with the speed of 1ms, and accumulation result is presented in seven segmentation LED screen.After waiting for one default period (general camera needs a few second), GPIO pin level upset (be generally high level and be set to low level) of control linkage camera shutter, simultaneously by counter resets (restarting after zero setting), now because camera detects the change of cable release level, start to enter exposure actions, take a photo.Photo now records be exactly this camera shutter action time, LED screen display Counter Value, the namely shutter delay time of this camera.In order to eliminate stochastic error, this device is after waiting for the time (generally still needing wait for that camera is ready to a few second) of presetting, can repeat to send exposure instruction to camera, reset counter, gathers multiple measured value so that the method for averaging is to eliminate stochastic error for user simultaneously.See Fig. 2, flow process can be designed to:
Step 1, flow process starts, and start counter, the accumulation result output display of counter is in seven segmentation LED screen;
Step 2, postpones to wait for that camera is ready to;
Step 3, judges whether and reaches default pendulous frequency, is then process ends, otherwise reset counter, sends exposure instruction by shutter control alignment camera, make camera take display and obtain this camera current shutter delay time, then step 2 is returned, until reach pendulous frequency.
During concrete enforcement, modular mode can be adopted to realize:
Arrange in described single-chip microcomputer with lower unit,
Counter unit, for starting counter, the accumulation result output display of counter is over the display;
For postponing, delay cell, waits for that camera is ready to;
Shooting judge module, for judging whether and reaching default pendulous frequency, it is then power cut-off, otherwise reset counter, exposure instruction is sent by shutter control alignment camera, make camera take display and obtain this camera current shutter delay time, then command counter cell operation, until reach pendulous frequency.
During concrete enforcement, those skilled in the art can preset the value of pendulous frequency voluntarily and postpone the time span of wait.After obtaining the shutter delay time of repetitive measurement gained, net result can be obtained by being averaging simply.Follow-up automatic processing device can be expanded, such as, computing machine is set, automatically identify on display numerical value by after photograph shooting results input computing machine and be averaging computing, realize full-automatic measurement.
Test through reality the camera that some officials have announced the shutter delay time, the result that this device records and the result consistance that official announces fine.Certain slr camera of such as Nikon, the shutter delay time that official announces is 40ms, and the result that this measurement device obtains is 43ms.
Above embodiment will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
Claims (8)
1. a camera shutter delay time measurement device, is characterized in that: the shutter control line comprising single-chip microcomputer, display and camera, and single-chip microcomputer connects the shutter control line of display and camera respectively, and display is placed in the viewfinder range of camera,
Arrange in described single-chip microcomputer with lower unit,
Counter unit, for starting counter, the accumulation result output display of counter is over the display;
For postponing, delay cell, waits for that camera is ready to;
Shooting judge module, for judging whether and reaching default pendulous frequency, it is then power cut-off, otherwise reset counter, exposure instruction is sent by shutter control alignment camera, make camera take display and obtain this camera current shutter delay time, then command counter cell operation, until reach pendulous frequency.
2. camera shutter delay time measurement device according to claim 1, is characterized in that: described display adopts four seven segmentation light-emitting diode displays.
3. camera shutter delay time measurement device according to claim 1, is characterized in that: described counter counts with 1ms interval.
4. camera shutter delay time measurement device according to claim 1 or 2 or 3, is characterized in that: camera to be measured for multiple stage is connected to single-chip microcomputer by shutter control line simultaneously.
5. a camera shutter delay time determining method, is characterized in that: the shutter control line arranging single-chip microcomputer, display and camera, and single-chip microcomputer connects the shutter control line of display and camera respectively, and display is placed in the viewfinder range of camera,
Described single-chip microcomputer performs following flow process,
Step 1, start counter, the accumulation result output display of counter is over the display;
Step 2, postpones to wait for that camera is ready to;
Step 3, judges whether and reaches default pendulous frequency, is then power cut-off, otherwise reset counter, sends exposure instruction by shutter control alignment camera, make camera take display and obtain this camera current shutter delay time, then step 2 is returned, until reach pendulous frequency.
6. camera shutter delay time determining method according to claim 5, is characterized in that: described display adopts four seven segmentation light-emitting diode displays.
7. camera shutter delay time determining method according to claim 5, is characterized in that: described counter counts with 1ms interval.
8. camera shutter delay time determining method according to claim 5 or 6 or 7, it is characterized in that: camera to be measured for multiple stage is connected to single-chip microcomputer by shutter control line simultaneously, the shutter delay time of multiple camera measured by single-chip microcomputer simultaneously.
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| CN201510219198.7A CN104820338B (en) | 2015-04-30 | 2015-04-30 | A kind of camera shutter delay time measurement device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107566827A (en) * | 2017-07-28 | 2018-01-09 | 腾讯科技（上海）有限公司 | Shoot Delay computing method, apparatus and equipment |
| CN110087062A (en) * | 2019-04-18 | 2019-08-02 | 中北大学 | A kind of high speed camera operating lag test method and system |
| CN110971892A (en) * | 2019-11-27 | 2020-04-07 | 深圳市派科斯科技有限公司 | Exposure delay measuring method, device and storage medium |
| CN111093021A (en) * | 2018-10-23 | 2020-05-01 | 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 |
| CN111435971A (en) * | 2019-01-15 | 2020-07-21 | 阿里巴巴集团控股有限公司 | Image acquisition parameter configuration method and device, terminal and readable storage medium |
| CN113438473A (en) * | 2021-06-25 | 2021-09-24 | 广州极飞科技股份有限公司 | Method and device for testing camera shutter lag time and terminal equipment |
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| 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 |
| 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 |
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| CN201408324Y (en) * | 2009-04-29 | 2010-02-17 | 重庆师范大学 | Camera shutter test instrument |
| 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 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107566827A (en) * | 2017-07-28 | 2018-01-09 | 腾讯科技（上海）有限公司 | Shoot Delay computing method, apparatus and equipment |
| CN111093021A (en) * | 2018-10-23 | 2020-05-01 | 光速视觉（北京）科技有限公司 | Time domain synchronization method of camera |
| 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 |
| CN111435971A (en) * | 2019-01-15 | 2020-07-21 | 阿里巴巴集团控股有限公司 | Image acquisition parameter configuration method and device, terminal and readable storage medium |
| 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 |
| CN110971892A (en) * | 2019-11-27 | 2020-04-07 | 深圳市派科斯科技有限公司 | Exposure delay measuring method, device and storage medium |
| 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 |
| CN113438473A (en) * | 2021-06-25 | 2021-09-24 | 广州极飞科技股份有限公司 | Method and device for testing camera shutter lag time and terminal equipment |
| 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 |
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