CN105357520B - Measure the method and device of camera exposure time - Google Patents
Measure the method and device of camera exposure time Download PDFInfo
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- CN105357520B CN105357520B CN201510917155.6A CN201510917155A CN105357520B CN 105357520 B CN105357520 B CN 105357520B CN 201510917155 A CN201510917155 A CN 201510917155A CN 105357520 B CN105357520 B CN 105357520B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Abstract
The invention provides a kind of method and device for measuring the camera exposure time.This method includes：For being placed in before tested camera into multiple light-emitting devices of two-dimensional array, different lines or each light-emitting device luminous and extinguishing successively do not gone together are controlled according to different light periods；Receive the image of the array of light emitting devices through control captured by tested camera；And reference column or reference row light-emitting device in determination described image, and the time for exposure of tested camera is calculated based on the light period of the reference column or reference row light-emitting device, wherein, the brightness in described image of each light-emitting device of reference column or the reference row light-emitting device is closest, or the reference column or reference row the light-emitting device quantity of the light-emitting device in luminance in described image are not less than predetermined threshold.The method and device of measurement camera exposure time provided by the invention can calculate the time for exposure of camera according to image that camera photographs, and not only precision is high and cost is low and is easy to implement.
Description
Technical field
The present invention relates to technical field of image processing, in particular to a kind of method and dress for measuring the camera exposure time
Put.
Background technology
The camera exposure time refers to the time interval that closing is opened to from shutter, and within this period of time, object can be
Image is left on egative film.Time for exposure sees depending on needs that different application scenarios may need the different time for exposure.
When evaluating and testing a camera product, it is critically important to obtain the time for exposure that camera actually uses in shooting image.However,
Many camera products, especially USB camera, do not export its current exposure time.Therefore, it is necessary to a kind of measurement phase
The method or apparatus of machine time for exposure.
The content of the invention
In view of the shortcomings of the prior art, on the one hand, the present invention provides a kind of method for measuring the camera exposure time, the side
Method includes：For being placed in before tested camera into multiple light-emitting devices of two-dimensional array, according to different light period control not
Same column or each light-emitting device luminous and extinguishing successively do not gone together；Receive the light-emitting device battle array through control captured by tested camera
The image of row；And reference column or reference row light-emitting device in determination described image, and it is based on the reference column or reference row
The light period of light-emitting device calculates the time for exposure of the tested camera, wherein, reference column or the reference row light-emitting device
Each light-emitting device in described image brightness it is closest, or, reference column or the reference row light-emitting device is in described image
In the quantity of light-emitting device in luminance be not less than predetermined threshold.
In one embodiment of the invention, for control it is each row or each row light-emitting device light period with columns or row
Several increase equal proportions are incremented by.
In one embodiment of the invention, when each light-emitting device for occurring multiple row or multirow light-emitting device in described image
When brightness is close, selects the one of the light period maximum to arrange or a line is as the reference column or reference row light-emitting device.
In one embodiment of the invention, by determining the pixel value of light-emitting device corresponding position in described image
Whether predetermined threshold value is exceeded to determine whether light-emitting device is in luminance.
In one embodiment of the invention, the light-emitting device is light emitting diode.
On the other hand, also a kind of device for measuring the camera exposure time of the present invention, described device include：Control module, use
In for being placed in before tested camera into multiple light-emitting devices of two-dimensional array, according to different light periods control different lines or
Each light-emitting device luminous and extinguishing successively do not gone together；Receiving module, for receiving the hair through control captured by tested camera
The image of electro-optical device array；And analysis module, for determining reference column or reference row light-emitting device in described image, and base
The time for exposure of the tested camera is calculated in the light period of the reference column or reference row light-emitting device, wherein, the base
The brightness in described image of each light-emitting device of quasi- row or reference row light-emitting device is closest, or, the reference column or benchmark
Row light-emitting device quantity of the light-emitting device in luminance in described image is not less than predetermined threshold.
In one embodiment of the invention, for control it is each row or each row light-emitting device light period with columns or row
Several increase equal proportions are incremented by.
In one embodiment of the invention, when each light-emitting device for occurring multiple row or multirow light-emitting device in described image
When brightness is close, the analysis module selects the maximum row of the light period or a line as the reference column or reference row
Light-emitting device.
In one embodiment of the invention, the analysis module is by determining that light-emitting device corresponds to position in described image
Whether the pixel value at the place of putting exceedes predetermined threshold value to determine whether light-emitting device is in luminance.
In one embodiment of the invention, the light-emitting device is light emitting diode.
The method and device of measurement camera exposure time provided by the invention can calculate according to the image that camera photographs
The time for exposure of camera, not only precision is high, cost is low, and is easy to implement.
Brief description of the drawings
The drawings below of the present invention is used to understand the present invention in this as the part of the present invention.Shown in the drawings of this hair
Bright embodiment and its description, for explaining the principle of the present invention.
In accompanying drawing：
Fig. 1 shows the flow chart of according to embodiments of the present invention, the measurement camera exposure time method；
Fig. 2 shows showing for the two-dimensional array for the light-emitting device put according to an embodiment of the invention before tested camera
Example；And
Fig. 3 shows the structured flowchart of according to embodiments of the present invention, the measurement camera exposure time device.
Embodiment
In the following description, a large amount of concrete details are given to provide more thorough understanding of the invention.So
And it is obvious to the skilled person that the present invention can be able to without one or more of these details
Implement.In other examples, in order to avoid obscuring with the present invention, do not enter for some technical characteristics well known in the art
Row description.
It should be appreciated that the present invention can be implemented in different forms, and it should not be construed as being limited to what is proposed here
Embodiment.On the contrary, providing these embodiments disclosure will be made thoroughly and complete, and will fully convey the scope of the invention to
Those skilled in the art.
The purpose of term as used herein is only that description specific embodiment and not as the limitation of the present invention.Make herein
Used time, " one " of singulative, "one" and " described/should " be also intended to include plural form, unless context is expressly noted that separately
Outer mode.It is also to be understood that term " composition " and/or " comprising ", when in this specification in use, determining the feature, whole
Number, step, operation, the presence of element and/or part, but be not excluded for one or more other features, integer, step, operation,
The presence or addition of element, part and/or group.Herein in use, term "and/or" includes any and institute of related Listed Items
There is combination.
In order to thoroughly understand the present invention, detailed step and detailed structure will be proposed in following description, so as to
Explain technical scheme.Presently preferred embodiments of the present invention is described in detail as follows, but in addition to these detailed descriptions, this
Invention can also have other embodiment.
The method that embodiments of the invention provide the measurement camera exposure time, for being calculated in the image that is photographed from camera
The time for exposure of camera.This method is described in detail with reference to Fig. 1.Fig. 1 shows according to embodiments of the present invention, measurement camera
The flow chart of the method 100 of time for exposure.As shown in figure 1, method 100 comprises the following steps：
Step 101：For being placed in into multiple light-emitting devices of two-dimensional array before tested camera, according to different luminous weeks
Each light-emitting device luminous and extinguishing successively of phase control different lines (or not going together).
Exemplarily, light-emitting device can be light emitting diode (LED).M*N light emitting diode can be placed in by
Survey before camera and form the lamp array of M rows N row, and each light emitting diode of each column controlled lights successively according to different light periods
And extinguishing.Or each light emitting diode often gone is controlled according to different light period successively luminous and extinguishing.
Fig. 2 shows showing for the two-dimensional array for the light-emitting device put according to an embodiment of the invention before tested camera
Example.As shown in Fig. 2 each small circular represents a light-emitting device, light-emitting device LED.In fig. 2 it is shown that M rows N row
LED battle array, for simplicity, only takes M=3, and each light emitting diode for exemplarily only describing each column in N row below is controlled according to not
Same light period luminous and extinguishing successively.Similarly, it will appreciated by the skilled person that each light-emitting diodes often gone
Manage the controlled process according to different light period successively luminous and extinguishing.
As shown in Fig. 2 N row lamp arrays line up one be placed across tested camera (not shown) before so that lamp bar is in quilt
Survey the image border of camera.N row lamp arrays are referred to as N group lamp arrays, the lamp longitudinal arrangement in every group.Can by this N groups lamp from
Left-to-right numbering is 1~N.
By controller, LED can be controlled to be lighted successively by pre-designed pattern, that is, control each column LED according to not
Same light period luminous and extinguishing successively, the image of the LED battle array through control is shot by being tested camera.Specifically, for i-th
3 lamps of group, the controlled a period of time Ti bright successively of this 3 lamps, i.e.,：
0) first lamp in three lamps is lighted；
1) the Ti times are waited；
2) extinguish first lamp in three lamps, light second lamp in three lamps；
3) the Ti times are waited；
4) extinguish second lamp in three lamps, light the 3rd lamp in three lamps；
5) the Ti times are waited；
6) extinguish the 3rd lamp in three lamps, return to and 0) restart.
The time Ti that every group of lamp uses may be constructed an incremental Geometric Sequence, for controlling each row (or each row) luminous
The light period of device is incremented by with the increase equal proportion of columns (or line number).Can miss the relative of measured value using Geometric Sequence
Difference limit is consistent in measurement range.Exemplary, T1=1/3ms, T (i+1)=1.2Ti.
Step 102：Receive the image of the array of light emitting devices through control captured by tested camera.
Exemplarily, any known to persons of ordinary skill in the art be wirelessly transferred or wire transmission technology connects can be used
The image on the array of light emitting devices through control captured by tested camera is received, for the figure captured by based on tested camera
Time for exposure as determining tested camera.
Step 103：It is determined that reference column (or reference row) light-emitting device in captured image, and it is based on the reference column
The light period of (or reference row) light-emitting device calculates the time for exposure of tested camera, wherein, the reference column (or reference row) hair
Brightness is closest in the picture for each light-emitting device of electro-optical device, or, reference column (or reference row) light-emitting device is in the picture
The quantity of light-emitting device in luminance is not less than predetermined threshold.If in a step 101 by row control light-emitting device
Luminous and extinguishing, then reference column light-emitting device is determined in captured image in step 103., whereas if in step 101
By the luminous and extinguishing of row control light-emitting device, then reference row light-emitting device is determined in captured image in step 103.
In one embodiment of the invention, can find in the picture each light-emitting device brightness it is immediate one row (or
A line) reference column (or reference row) light-emitting device is used as, exemplarily, it can judge that each light-emitting device exists by naked eyes viewing
Whether brightness approaches in image, or, it can be sentenced by luminance detection device (for example, luminance sensor) with cooperations such as processors
Breaking, whether brightness approaches each light-emitting device in the picture.If controlling the luminous and extinguishing of light-emitting device by row, with continued reference to
Fig. 2 example.In fig. 2, for the image of the lamp array photographed, in the picture bright of three lamps in N number of lamp group can be found
Immediate one group is spent, if it is i-th group, then the measured value of time for exposure is exactly 3Ti.This is due to when the period of change of lamp group
When the integral multiple of (3Ti) and close time for exposure, brightness that 3 lamps are photographed just can be very close to.Therefore, it can be deduced that to quilt
Survey the estimation of the time for exposure of time.Similarly, it will appreciated by the skilled person that when by the luminous dress of row control
The light period based on reference row light-emitting device calculates the process of the time for exposure of tested camera during the luminous and extinguishing put.
When each light-emitting device brightness for occurring multiple row light-emitting device in captured image is close, light period is selected most
Big row (i.e. in fig. 2 when three lamps in multigroup brightness all very close to when, select the row of rightmost) be used as reference column
Light-emitting device.Similarly, when each light-emitting device brightness for occurring multirow light-emitting device in captured image is close, selection hair
A line of photoperiod maximum is as reference row light-emitting device.
If in captured image by naked eyes find brightness it is immediate one row (or a line) light-emitting device, with based on
Its light period calculate the tested camera exposure time method can direct with the naked eye reading, suitable in time for exposure required precision
The scene quickly estimated the camera exposure time in the case of not high.If coordinated by luminance detection device and processor
Mode find an immediate row (or a line) light-emitting device of brightness, during calculating tested camera exposure based on its light period
Between process can be completed by processor, exemplarily, some computings can be carried out by processor and obtain the tested camera exposure time, it is real
Existing automatic measurement, precision are higher.
In another embodiment of the present invention, the luminous dress in luminance can be found in captured image
Row (or a line) light-emitting device of the quantity not less than predetermined threshold is put as reference column (or reference row) device.For example, with by
It is example that row, which controls the luminous and extinguishing of light-emitting device, and control array of light emitting devices is lighted and put out by pre-designed pattern
Go out.Exemplarily, N*M LED is put into M rows N row, wherein N>=4, M>=1.Can be in period j*Ti per the lamp of i rows j row
~(j+1) * Ti, (j+N) * Ti~(j+N+1) * Ti, (j+2N) * Ti~(j+2N+1) * Ti ... inside light, wherein, Ti is every
One time parameter of a line identical, is incremented by with i in a manner of Geometric Sequence.Exemplary, Ti=1ms*Ni/2。
, exemplarily, can be by determining the pixel of light-emitting device corresponding position in the picture in the image of shooting
Whether value exceedes predetermined threshold value to determine whether light-emitting device is in luminance.For example, the predetermined threshold value be 200, then when appoint
When the pixel value of corresponding position of one LED in captured image is more than 200, it is illuminating state to determine the LED,
It is otherwise non-lit up.
The quantity for making Si be the lamp for being in illuminating state per a line, then it can search out the minimum for making Si be not less than predetermined threshold
I, such as make Si>=3 minimum i, then Si*Ti is measured value.Si>=3 this condition may insure that measured value is more than Ti.
Because the lamp being only lit in camera exposure can be just photographed, so method in this embodiment can measure camera
Time for exposure.The estimation that method in the embodiment was applied to the time for exposure has higher requirements, or requires automatic measurement
Scene.The image that the method for measurement camera exposure time according to the above embodiment of the present invention photographs according to camera calculates camera
Time for exposure, not only precision is high, cost is low, and is easy to implement.
According to another aspect of the present invention, the device of measurement camera exposure time is additionally provided.Fig. 3 is shown according to this hair
The structured flowchart of the device 300 of the measurement camera exposure time of bright embodiment.As shown in figure 3, device 300 includes control module
301st, receiving module 302 and analysis module 303.Wherein, control module 301 can include processor, for for being placed in
Into multiple light-emitting devices of two-dimensional array before tested camera, each of different lines (or not going together) is controlled according to different light periods
Light-emitting device luminous and extinguishing successively；Receiving module 302 can include cable interface, USB interface and corresponding controller, use
In the image for receiving the array of light emitting devices through control captured by tested camera；Analysis module 303 can include processor, use
In it is determined that reference column (or reference row) light-emitting device in captured image, and based on the luminous dress of the reference column (or reference row)
The light period put calculates the time for exposure of tested camera.Wherein, each luminous dress of reference column (or reference row) light-emitting device
It is closest to put brightness in the picture, or, reference column (or reference row) light-emitting device is in the hair of luminance in the picture
The quantity of electro-optical device is not less than predetermined threshold.
In one embodiment of the invention, for control it is each row (or each row) light-emitting device light period with columns
The increase equal proportion of (or line number) is incremented by.
In one embodiment of the invention, when each hair for occurring multiple row (or multirow) light-emitting device in captured image
When electro-optical device brightness is close, analysis module 303 selects the maximum row (or a line) of light period as reference column (or benchmark
OK) light-emitting device.
In one embodiment of the invention, analysis module 303 is by determining light-emitting device corresponding position in the picture
Pixel value whether exceed predetermined threshold value and determine whether light-emitting device is in luminance.
In one embodiment of the invention, light-emitting device is light emitting diode.
The embodiment that may be referred to Fig. 1 descriptions understands the detailed process of above-mentioned each module operation, and here is omitted.This
The modules of inventive embodiments can be realized with hardware, or the software module to be run on one or more processor
Realize, or realized with combinations thereof.It will be understood by those of skill in the art that can in practice using microprocessor or
In device of the person's digital signal processor (DSP) to realize the measurement camera exposure time according to embodiments of the present invention some or
The some or all functions of person's whole part.The present invention is also implemented as perform method as described herein one
Divide either whole equipment or program of device (for example, computer program and computer program product).It is such to realize this hair
Bright program can store on a computer-readable medium, or can have the form of one or more signal.It is such
Signal can be downloaded from internet website and obtained, and either provided on memory carrier or provided in the form of any other.
The present invention is illustrated by above-described embodiment, but it is to be understood that, above-described embodiment is only intended to
Citing and the purpose of explanation, and be not intended to limit the invention in described scope of embodiments.In addition people in the art
Member can also make more kinds of it is understood that the invention is not limited in above-described embodiment according to the teachings of the present invention
Variants and modifications, these variants and modifications are all fallen within scope of the present invention.Protection scope of the present invention by
The appended claims and its equivalent scope are defined.
Claims (8)
- A kind of 1. method for measuring the camera exposure time, it is characterised in that methods described includes：For being placed in before tested camera into multiple light-emitting devices of two-dimensional array, different lines are controlled according to different light periods Or each light-emitting device luminous and extinguishing successively do not gone together；Receive the image of the array of light emitting devices through control captured by the tested camera；AndDetermine the reference column or reference row light-emitting device in described image, and based on the reference column or reference row light-emitting device Light period calculates the time for exposure of the tested camera,Wherein, reference column or the reference row light-emitting device be the brightness in described image of each light-emitting device it is immediate one row or A line, or be the maximum row or one of light period in the immediate multiple row of each light-emitting device brightness in described image or multirow OK；Or the quantity of the reference column or reference row the light-emitting device light-emitting device in luminance in described image is not Less than predetermined threshold.
- 2. the method as described in claim 1, it is characterised in that for control it is each row or each row light-emitting device light period with The increase equal proportion of columns or line number is incremented by.
- 3. method as claimed in claim 2, it is characterised in that by determining light-emitting device corresponding position in described image Pixel value whether exceed predetermined threshold value and determine whether light-emitting device is in luminance.
- 4. the method as described in any one of claim 1-3, it is characterised in that the light-emitting device is light emitting diode.
- 5. a kind of device for measuring the camera exposure time, it is characterised in that described device includes：Control module, for for being placed in before tested camera into multiple light-emitting devices of two-dimensional array, according to different luminous Periodic Control different lines or each light-emitting device luminous and extinguishing successively do not gone together；Receiving module, for receiving the image of the array of light emitting devices through control captured by the tested camera；AndAnalysis module, for determining reference column or reference row light-emitting device in described image, and it is based on the reference column or base There won't be any problem the light period of light-emitting device calculates the time for exposure of the tested camera,Wherein, reference column or the reference row light-emitting device be the brightness in described image of each light-emitting device it is immediate one row or A line, or be the maximum row or one of light period in the immediate multiple row of each light-emitting device brightness in described image or multirow OK；Or the quantity of the reference column or reference row the light-emitting device light-emitting device in luminance in described image is not Less than predetermined threshold.
- 6. device as claimed in claim 5, it is characterised in that for control it is each row or each row light-emitting device light period with The increase equal proportion of columns or line number is incremented by.
- 7. device as claimed in claim 6, it is characterised in that the analysis module is by determining light-emitting device in described image Whether the pixel value of middle corresponding position exceedes predetermined threshold value to determine whether light-emitting device is in luminance.
- 8. the device as described in any one of claim 5-7, it is characterised in that the light-emitting device is light emitting diode.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108900834B (en) * | 2018-07-25 | 2019-08-23 | 南京富锐光电科技有限公司 | A kind of high speed camera time for exposure and lose frame measuring device and method |
| CN108668127B (en) * | 2018-08-01 | 2019-09-27 | 昆山丘钛微电子科技有限公司 | Imaging device time for exposure test device |
| 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 |
| 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 |
| CN114007062A (en) * | 2021-10-29 | 2022-02-01 | 上海商汤临港智能科技有限公司 | Measuring system, method, device, computer equipment and storage medium |
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Address after: 100190 Beijing, Haidian District Academy of Sciences, South Road, No. 2, block A, No. 313 Applicant after: BEIJING KUANGSHI TECHNOLOGY Co.,Ltd. Applicant after: MEGVII (BEIJING) TECHNOLOGY Co.,Ltd. Address before: 100190 Beijing, Haidian District Academy of Sciences, South Road, No. 2, block A, No. 313 Applicant before: BEIJING KUANGSHI TECHNOLOGY Co.,Ltd. Applicant before: PINHOLE (BEIJING) TECHNOLOGY Co.,Ltd. |
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Denomination of invention: Method and device for measuring camera exposure time Effective date of registration: 20230404 Granted publication date: 20171226 Pledgee: Shanghai Yunxin Venture Capital Co.,Ltd. Pledgor: BEIJING KUANGSHI TECHNOLOGY Co.,Ltd.|MEGVII (BEIJING) TECHNOLOGY Co.,Ltd. Registration number: Y2023990000191 |
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