CN205490960U - Camera/video camera exposure time test system - Google Patents
Camera/video camera exposure time test system Download PDFInfo
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- CN205490960U CN205490960U CN201521050094.XU CN201521050094U CN205490960U CN 205490960 U CN205490960 U CN 205490960U CN 201521050094 U CN201521050094 U CN 201521050094U CN 205490960 U CN205490960 U CN 205490960U
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- time
- camera
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- test system
- pulse generator
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- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 229910052701 rubidium Inorganic materials 0.000 claims description 13
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 description 14
- 239000011324 bead Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 1
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model relates to a camera/video camera exposure time test system. The LED lamp array comprises a high-precision time pulse generator, an LED lamp array and a main control computer. The utility model provides a camera/video camera exposure time test system that precision is high, convenient operation, with low costs.
Description
Technical field
This utility model belongs to photoelectricity test field, relates to a kind of test system, particularly relates to one
Plant camera/camcorder time of exposure test system.
Background technology
Along with camera, the reaching its maturity of camcorder technology, digital camera and video camera have become as
Main flow, for present wide variety of digital camera and video camera, general employing is built-in
Electronic shutter, it is impossible to directly measuring the time of exposure of digital camera, the method that standard specifies is
The most applicable.For the research worker of this China National Measuring Science Research Inst. " during digital cameral exposure
Between scaling method research " in propose the method by auxiliary shuttern and be exposed the test of time.
The method test philosophy is as follows:
Digital camera, the light exposure (H) of video camera are equal to the time of exposure (t) of its electronic shutter
With the product of illuminance of image plane (E) i.e.:
H=E × t (1)
In formula: H: light exposure, show as gradation of image；
E: illuminance of image plane, is a constant during each parameter determination；
T: time of exposure.
Then time of exposure is:
In formula: H1: auxiliary shuttern fully opens, open the light exposure under equipment self shutter；
H2: equipment built-in electronic shutter fully opens, starts the exposure under auxiliary shuttern
Amount；
The demarcation time of exposure of t1: auxiliary shuttern；
T2:: equipment under test time of exposure
The method supposing, parameter E is a constant, but the factor of affecting parameters E in actual test
The most, such as light stability degree, uniformity；Auxiliary door opening position and motion mode and photoreceptors
Part responsiveness.Error is wayward, and operation easier is relatively big, is difficult to promote in Product checking field.
The research worker of Guangzhou Institute of Measuring And Testing Technology proposes dynamic object shooting method and carries out
Time of exposure is tested.The method is the movement locus of shooting moving object, when digital camera shoots
Rotating point source, if arranging time that light source rotates a circle more than time of exposure, then time of exposure
With point source track relation in gained image it is: time of exposure is that image track angle is divided by light source
Angular velocity of rotation.The problem that the method exists is main: (1) track rotational angle measures difficulty relatively
Greatly.(2) it is difficult to prepare the destination apparatus of high rotating speed high stability.(3) the strange edge of image is easy
Conditions of streaking occurs, has brought test error into.Therefore the method is the most just difficult to promote.
Utility model content
The exposure of digital camera/video camera cannot be directly measured in order to solve background technology is previously mentioned
The technical problem of light time, it is simple that this utility model provides a kind of test process, it is easy to engineering
A kind of camera/camcorder time of exposure test system realized.
For realizing above utility model purpose, this utility model provides techniques below scheme: a kind of
Camera/camcorder time of exposure test system, it is characterized in that
Including split-second precision pulse generator, LED light array, main control computer；
Described main control computer includes the image acquisition for gathering tested camera review data
Unit, frequency control unit and image-display units；
Described split-second precision pulse generator respectively with LED light array and FREQUENCY CONTROL list
Unit connects；Described frequency control unit is sent out with image acquisition units and split-second precision pulse respectively
Raw device is connected；
Described LED light array include controlling the driver element of LED brightness, fast reaction LED,
LED control unit；
Described split-second precision pulse generator includes rubidium atomic frequency standard and B code generator；
Described rubidium atomic frequency standard is: day drift rate 1 × 10-11～6 × 10-13/1d, frequently
Degree of stability: sample time 1s:s=5 × 10-11～5 × 10-12/1s；Frequency accuracy A:2
× 10-10～5 × 10-11/1s；
Above-mentioned state split-second precision pulse generator output pulse square wave frequency be 1Hz, 10Hz,
100Hz, 1KHz, 10KHz and 100KHz；
The lighting time of above-mentioned fast reaction LED and fall time are ns level；
Above-mentioned LED light array includes: the LED of n × m (n, m >=4) individual equidistant arrangement.
The utility model has the advantages that: this utility model utilizes shooting multiple image, by checking
Dbjective state captured by image carries out camera exposure Time Calculation, it is provided that a kind of test process
Simply, it is easy to the camera camera shutter time test system and method for Project Realization.
This utility model uses LED light array as target, has high brightness, low-power consumption, fast
The superperformance of speed reaction.The mode using regulation operating current changes LED light energy, makes mesh
Mark feature substantially and is more easy to differentiate.The test request of different exposure time can be met.Use quickly
Reaction LED lamp bead, its response time (including lighting time and fall time) is ns level,
Effectively subtract the test error brought due to LED response characteristic.This LED light array is comprised
LED lamp bead number should be no less than 50 (test high level error close to 2%), for improving test
Precision can increase LED lamp bead number.
This utility model use split-second precision pulse generator as signal source, use high accuracy,
High stability, the rubidium atomic frequency standard can traced to the source to national measurement standard as time reference,
1Hz, 10Hz, 100Hz, 1KHz, 10KHz and 100KHz is exported by B code generator
Pulse square wave etc. multiple different frequency.The time of exposure test to us level of the s level can be met.
Its day drift rate 1 × 10-11～6 × 10-13/1D, frequently degree of stability: sample time 1s:s=5
× 10-11～5 × 10-12/1S；Frequency accuracy A:2 × 10-10～5 × 10-11/1S.
Provide high accuracy, high stability time reference effectively reduces test error.
This utility model uses high accuracy, high temperature sensitivity capture card as final image data
Collection, make this equipment be applicable to camera and video camera time of exposure test, expanded test
Function.Carry out camera shutter time test time, this capture card can carry out digital signal and
Collection of simulant signal.It is applicable to multiple video camera.
This utility model utilizes image processing techniques and Computer Control Technology to achieve camera and takes the photograph
Camera time of exposure is tested automatically, saves labour force and cost.
Accompanying drawing explanation
Fig. 1 is this utility model structural representation；
Wherein when 1-LED lamp array, the tested video camera of 2-, 3-main control computer, 4-high accuracy
Between pulse generator.
Detailed description of the invention
Below in conjunction with the accompanying drawings content of the present utility model is described in detail.
Fig. 1 gives a specific embodiment of the present utility model.During camera/camcorder exposure
Between test system, including split-second precision pulse generator 4, LED light array 1, master control meter
Calculation machine 3；Main control computer 3 includes the image acquisition for gathering tested camera review data
Unit, for controlling frequency control unit and the use of split-second precision pulse generator output frequency
Image-display units in the image that display camera or video camera are taken pictures；Split-second precision pulse
Generator 4 is connected with LED light array 1 and frequency control unit respectively；Frequency control unit divides
It is not connected with image acquisition units and split-second precision pulse generator 4；LED light array 1 wraps
Include and can control the driver element of LED brightness, fast reaction LED, LED control unit；High
Precision Time pulse generator 4 includes that (rubidium atomic frequency standard is that rubidium is former to rubidium atomic frequency standard
The one of secondary clock) and B code generator；Above-mentioned rubidium atomic frequency standard is the one of rubidium atomic clock；
Above-mentioned B code generator is a kind of common apparatus when the Big Dipper or GPS school, it is possible to receive
Extraneous signal automatically generates various timing signal；Rubidium atomic frequency standard is: day drift rate 1 ×
10-11～6 × 10-13/1d, frequently degree of stability: sample time 1s:s=5 × 10-11～5 ×
10-12/1s；Frequency accuracy A:2 × 10-10～5 × 10-11/1s, above-mentioned rubidium atom frequency
Rate standard refers within a certain period of time, the rubidium atomic frequency such as 1 day, in 1 second.Split-second precision
Pulse generator 4 export the frequency of pulse square wave be 1Hz, 10Hz, 100Hz, 1KHz,
10KHz and 100KHz；The lighting time of fast reaction LED and fall time are ns level；
LED light array is equidistantly rearranged by n × m (n, m >=4) individual LED.
The method of testing of camera/camcorder time of exposure test system, comprises the following steps:
1] tested camera/camcorder is fixed to correct position；Will fix by camera/photographing unit；
2], before LED light array being placed on camera, regulation LED light array position makes LED light array
Just cover viewing field of camera；
3] lightening LED lamp array, regulates LED luminance, makes each LED in LED light array
Lamp imaging under camera regulation time of exposure is clear and legible；Clear to imaging in camera GB
Clear definition includes subjective assessment and objective evaluation, used here as subjective assessment, objective evaluation one
As shoot resolution chart measure, the most inapplicable, subjective assessment can only be used；Mean LED
Pearl is clear and legible；
4] according to exposure time range or the nominal value of surveyed camera/camcorder, take higher than this value
The frequency of at least 1 order of magnitude is output frequency；The defeated of split-second precision pulse generator is set
Go out this frequency；Step 4] need the exposure time range according to product or nominal value to select output
Frequency.
5] use camera that LED light array is continuously shot some width images, main control computer collection
Taken image；
6] use the captured image of main control computer playback, check in each width image taken
LED lamp bead number and the N that averages；
7] use following equation calculating time of exposure:
In formula (1): t is time of exposure value of calculation；The LED that N is taken is average
Lamp bead number；F is the output frequency of split-second precision pulse generator.
Claims (4)
1. a camera/camcorder time of exposure test system, it is characterised in that: include split-second precision pulse generator, LED light array, main control computer；
Described main control computer includes image acquisition units, frequency control unit and image-display units；
Described split-second precision pulse generator is connected with LED light array and frequency control unit respectively；Described frequency control unit is connected with image acquisition units and split-second precision pulse generator respectively；
Described LED light array includes controlling the driver element of LED brightness, fast reaction LED, LED control unit；
Described split-second precision pulse generator includes rubidium atomic frequency standard and B code generator；
Described rubidium atomic frequency standard is: day drift rate 1 × 10-11～6 × 10-13/1d, degree of stability frequently: sample time 1s:s=5 × 10-11～5 × 10-12/1s；Frequency accuracy A:2 × 10-10～5 × 10-11/1s.
A kind of camera/camcorder time of exposure test system the most according to claim 1, it is characterised in that: the frequency of described split-second precision pulse generator output pulse square wave is 1Hz, 10Hz, 100Hz, 1KHz, 10KHz and 100KHz.
A kind of camera/camcorder time of exposure test system the most according to claim 1 and 2, it is characterised in that: the lighting time of described fast reaction LED and fall time are ns level.
A kind of camera/camcorder time of exposure test system the most according to claim 1 and 2, it is characterised in that: described LED light array includes n × m the LED equidistantly arranged, wherein n, m >=4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521050094.XU CN205490960U (en) | 2015-12-16 | 2015-12-16 | Camera/video camera exposure time test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521050094.XU CN205490960U (en) | 2015-12-16 | 2015-12-16 | Camera/video camera exposure time test system |
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| CN205490960U true CN205490960U (en) | 2016-08-17 |
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| CN201521050094.XU Expired - Fee Related CN205490960U (en) | 2015-12-16 | 2015-12-16 | Camera/video camera exposure time test system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105430387A (en) * | 2015-12-16 | 2016-03-23 | 中国科学院西安光学精密机械研究所 | Camera/video camera exposure time testing system and method |
| CN111726538A (en) * | 2019-03-20 | 2020-09-29 | 北京初速度科技有限公司 | Image exposure parameter measurement system and target equipment |
| CN113225551A (en) * | 2021-05-07 | 2021-08-06 | 中国人民解放军63660部队 | Camera exposure time detection method based on calibration lamp |
-
2015
- 2015-12-16 CN CN201521050094.XU patent/CN205490960U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105430387A (en) * | 2015-12-16 | 2016-03-23 | 中国科学院西安光学精密机械研究所 | Camera/video camera exposure time testing system and method |
| CN105430387B (en) * | 2015-12-16 | 2017-12-01 | 中国科学院西安光学精密机械研究所 | Camera/video camera exposure time testing system and method |
| CN111726538A (en) * | 2019-03-20 | 2020-09-29 | 北京初速度科技有限公司 | Image exposure parameter measurement system and target equipment |
| CN111726538B (en) * | 2019-03-20 | 2021-10-01 | 北京初速度科技有限公司 | Image exposure parameter measurement system and target equipment |
| CN113225551A (en) * | 2021-05-07 | 2021-08-06 | 中国人民解放军63660部队 | Camera exposure time detection method based on calibration lamp |
| CN113225551B (en) * | 2021-05-07 | 2022-11-22 | 中国人民解放军63660部队 | Camera exposure time detection method based on calibration lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20181216 |