CN106657802B - A kind of rotary-type multispectral camera automatic exposure regulating system and adjusting method - Google Patents
A kind of rotary-type multispectral camera automatic exposure regulating system and adjusting method Download PDFInfo
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- CN106657802B CN106657802B CN201611180137.5A CN201611180137A CN106657802B CN 106657802 B CN106657802 B CN 106657802B CN 201611180137 A CN201611180137 A CN 201611180137A CN 106657802 B CN106657802 B CN 106657802B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/71—Circuitry for evaluating the brightness variation
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Exposure Control For Cameras (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Blocking Light For Cameras (AREA)
Abstract
A kind of rotary-type multispectral camera automatic exposure regulating system and adjusting method, system include filter wheel, optical lens, imaging detector, Photometer part, signal processing unit, control unit and data record unit.The brightness information through optical filter is measured and calculated by Photometer part and signal processing unit, and the exposure parameter of multispectral camera is adjusted according to the brightness information of measurement.Filter wheel, optical lens, the placement location of Photometer part and filter wheel direction of rotation guarantee the position of a certain optical filter and imaging detector on filter wheel to it is corresponding when filter wheel next optical filter and Photometer part position it is corresponding.The exposure parameter needed for Photometer part position optical filter corresponds to spectral coverage is calculated according to the brightness information through optical filter of measurement, when filter wheel rotation makes to have surveyed light optical filter and imaging detector position to the exposure parameter exposure image of control imaging detector as needed when corresponding to.
Description
Technical field
The present invention relates to a kind of automatic exposure regulating system and adjusting methods, belong to multispectral camera automatic control technology neck
Domain.
Background technique
Multi-optical spectrum imaging system usually has following several imaging modes: multi-detector multi-lens imaging mode, light beam separation
Imaging mode, miniature narrow-band filter array imaging mode, gradual filter imaging mode, optical filter runner imaging mode.It adopts
The multi-optical spectrum imaging system designed with optical filter runner imaging mode is excellent with same optical path only with an optical system
Gesture converts optical filter by the rotation of detector front filter runner, obtains multi-band image.Rotary-type multispectral camera
Advantage is that optical filter is replaceable, flexible in application, can be applicable in different applications, has been applied to industrial detection, air remote sensing
Equal fields.Since the central wavelength and spectral coverage of optical filter are of different size, the received light energy value difference of detector is bigger, imaging
When need to carry out auto-exposure control.Automatic exposure generally comprise brightness measurement, scene (signal) analysis and exposure compensating this
Three steps.
Usually there are two types of implementations for camera automatic exposure: one is optical modes, and one is electronic manners.Optics side
Formula measures brightness using an individual sensor, and image information is then obtained by imaging sensor, such imaging system
The luminance information of the image information for being used to show storage and image is separated into independent processing.
Optical mode automatic exposure is divided into External metering and interior two kinds of sides of survey light according to the riding position difference of photometry sensor
Formula.Photometry sensor is usually mounted on the surface or oblique upper of optical lens by External metering mode, for measuring brightness
Optical path and optical path for imaging be to be separated from each other independent, common method is based on ambient light sensor sense ambient light
Condition simultaneously selects exposure to be arranged by exposure setter using the instruction of environment light condition.Interior Exposure Metering is often in camera lens and Jiao Ping
One piece of main reflective mirror that can be popped up and reset downwards is placed in 45° angle between the shutter of face.When in light state is surveyed, by
Camera lens enters the light come in and is irradiated to survey light sensing after principal reflection mirror and subsequent focusing screen, condenser lens and reflective prism
On device and in view finder, light is surveyed for photometry sensor and is found a view.
The signal of imaging sensor output then is used to measure illuminance by electronic manner automatic exposure simultaneously.Based on shooting
The actual grey value of image judge that status has been widely used to the method that exposure value is adjusted.
Under electronics automatic exposure mode, for measuring the signal of current environment brightness situation directly from image sensing
The signal of device output, no longer needs separately to add photometry sensor in this way, and structure is simple, realizes and is easy, but measurement processing speed is slower.
It, can be because exposing delay normal imaging using this method when the revolving speed of runner is very fast for rotary-type multispectral camera.
Under optics automatic exposure mode, external light intensity can only be measured with the Exposure Metering except runner by placing, and cannot currently be filtered
The intensity signal of mating plate；The Exposure Metering that photometry sensor and imaging detector are put together will increase optical filtering chip size, make
Whole system volume becomes larger.
Summary of the invention
Technical problem solved by the present invention is overcome the deficiencies in the prior art, propose a kind of rotary-type multispectral camera from
Dynamic exposure regulating system and adjusting method can effectively solve rotary-type multispectral camera automatic exposure adjusting at present and face not
The problem of rationally being exposed with spectral coverage image.
The technical solution of the invention is as follows: a kind of rotary-type multispectral camera automatic exposure regulating system, comprising: filters
Wheel, optical lens, imaging detector, Photometer part, signal processing unit, control unit, data record unit；Optical lens is put
It sets in filter wheel side, imaging detector, Photometer part are placed on the filter wheel other side；
Filter wheel includes rotary wheel device and optical filter, and the optical filter on filter wheel is uniformly distributed, and filter wheel is in rotary course
In, imaging detector and Photometer part are corresponding with filter centers two adjacent on filter wheel position respectively simultaneously；Filter wheel
Photoelectric sensor is installed, whether measurement optical filter reaches imaging detector position, and by the position of optical filter in rotary wheel device
Information is sent to control unit；
Optical lens uses transmitted light camera lens, and incident ray is after optical lens converges by the optical filter on filter wheel
It filters, projects on imaging detector；
Imaging detector receives the incident light after the optical filtering of filter wheel upper filter, passes through time for exposure and gain adjustment
The exposure parameter setting signal of light exposure, imaging detector reception control unit changes exposure parameter, in the control of control unit
Lower acquisition image is simultaneously exported to data record unit；
Photometer part is equipped with camera lens, and the camera lens of Photometer part is parallel with optical lens optical axis；Photometer part, which receives, to be penetrated
The incident optical signal of optical filter is converted to current signal and is transferred to signal processing unit；
Signal processing unit receives the current signal of Photometer part input, according to calibrated Photometer part electric current and light
The relationship of degree obtains the luminance data through optical filter, and luminance data is sent to control unit；
Control unit is stored with the time for exposure of luminance data and imaging detector and the relation database table of gain, according to
The luminance data that signal processing unit is sent calculates exposure parameter needed for optical filter corresponds to spectral coverage, and exposure parameter includes into
Time for exposure and gain as detector；Exposure parameter setting signal is sent to imaging detector by control unit, in filter wheel
When going to imaging position, control imaging detector is configured exposure parameter and controls imaging detector acquisition image, simultaneously
Spectral coverage information is sent to data record unit by control unit；
The spectral coverage information data that data record unit records the image data of imaging detector output and control unit is sent.
The imaging detector be global electronic shutter face battle array cmos imaging detector or global electronic shutter area array CCD at
As detector, time for exposure and gain adjustment light exposure by imaging detector.
The Photometer part uses silicon photoelectric diode or silicon photocell.
A kind of rotary-type multispectral camera automatic exposure regulating method, comprises the following steps that
Step 1: optical lens is placed on filter wheel side, imaging detector, that Photometer part is placed on filter wheel is another
Side；The position of imaging detector and Photometer part is adjusted, so that imaging detector and Photometer part are simultaneously respectively and on filter wheel
Two adjacent filter center positions are corresponding；Driving filter wheel starts turning；
Step 2: optical filter location information is sent to control unit by filter wheel, filter on control unit detection filter wheel
Whether piece reaches imaging and surveys optical position；
Step 3: when control unit detects the center some optical filter A and imaging detector position pair in filter wheel
At once, the measurement of Photometer part penetrates the optical signal for next optical filter B that optical filter A is adjacent in filter wheel and will transmit through optical filter
The optical signal of B is converted to current signal and is transferred to signal processing unit；Signal processing unit receives the electric current of Photometer part input
Signal obtains the luminance data through optical filter according to the relationship of calibrated Photometer part electric current and brightness, and by light
Brightness data is sent to control unit, and control unit is according to the pass of the time for exposure and gain of luminance data and imaging detector
Be tables of data and at this time signal processing unit output luminance data be calculated optical filter B correspond to spectral coverage be imaged when imaging
The time for exposure of detector needs and gain parameter are simultaneously recorded；
Step 4: whether corresponding to spectral coverage in a upper position for filter wheel rotation using control unit inquiry optical filter A
It has carried out survey light: if having surveyed light, imaging detector exposure image being controlled according to the exposure parameter that control unit after survey light obtains,
And the image data and spectral coverage information data of spectral coverage are corresponded to by data record unit record optical filter A；If not surveying light, spy is imaged
Survey device not exposure image；Exposure parameter includes time for exposure and the gain of imaging detector；
Step 5: driving filter wheel cycle rotation, repeats step 2~step 4, it is logical that data record unit records incident light
The image data and corresponding spectral coverage information data for crossing each spectral coverage acquisition after optical filter, until completing to all spectral coverage image datas
Acquisition and record.
The imaging detector be global electronic shutter face battle array cmos imaging detector or global electronic shutter area array CCD at
As detector, time for exposure and gain adjustment light exposure by imaging detector.
The Photometer part uses silicon photoelectric diode or silicon photocell.
The advantages of the present invention over the prior art are that:
(1) present invention measures the brightness through optical filter by the way of External metering, according to through optical filter
Brightness be exposed adjusting, can satisfy rotary-type multispectral camera application, the especially replaceable application demand of optical filter；
Have the advantages that adjustment speed is fast, wide adaptation range；
(2) Photometer part of the present invention and image device installation site correspond to two adjacent optical filters, pass through filter wheel
Light and camera exposure process are surveyed in rotation control.Optical filtering chip size when can avoid the installation of Photometer part increases, the installation of Photometer part
Flexibly, and control is simple.
Detailed description of the invention
Fig. 1 is a kind of rotary-type multispectral camera automatic exposure regulating system composition schematic diagram；
Fig. 2 is a kind of rotary-type multispectral camera automatic exposure regulating method block diagram.
Specific embodiment
As shown in Figure 1, a kind of rotary-type multispectral camera automatic exposure regulating system, including filter wheel, optical lens, at
As detector, Photometer part, signal processing unit, control unit, data record unit.
Filter wheel includes rotary wheel device and optical filter, and the optical filter on filter wheel is uniformly distributed.Filter wheel is driven by motor,
It is equipped with whether photoelectric sensor measurement optical filter reaches imaging detector position in rotary wheel device, and the position of optical filter is believed
Breath is sent to control unit.
Optical lens uses transmitted light camera lens, and optical lens is placed on filter wheel front end.Incident ray is through optical frames
It is filtered, is projected on imaging detector by the optical filter on filter wheel after head convergence.
Imaging detector selects global electronic shutter face battle array cmos imaging detector or the imaging of global electronic shutter area array CCD
Detector passes through imaging detector time for exposure and gain adjustment light exposure.The exposure of imaging detector reception control unit is joined
Number setting signal changes exposure parameter, acquires image under the control of the control unit and exports.
Photometer part selects silicon photoelectric diode or silicon photocell, and installs mating camera lens in Photometer part front end.Survey light
The camera lens of device is parallel with optical lens optical axis.Photometer part receives the optical signal for penetrating optical filter, is converted to current signal biography
It is defeated to arrive signal processing unit.The current value of Photometer part silicon photoelectric diode output and the linear pass of brightness for penetrating optical filter
System.
Signal processing unit handles the Photometer part current signal of input, according to calibrated Photometer part electric current
The luminance data through optical filter is obtained with the relationship of brightness, is sent to control unit.
Control unit uses DSP circuit plate, wherein the cmos detector for being stored with luminance data and imaging detector exposes
With the relation database table of gain between light time, the exposure parameter needed for optical filter corresponds to spectral coverage is calculated according to brightness information, is wrapped
Include time for exposure and the gain of imaging detector.Control unit controls filter wheel, imaging detector, Photometer part, data record
The synchronization of cell operation.For control unit when filter wheel goes to Photometer part position, tracer signal processing unit sends brightness
Data and survey spectrum segment information；Simultaneously when filter wheel goes to imaging position, imaging detector exposure parameter is configured simultaneously
It controls imaging detector and acquires image, while spectral coverage information is sent to data record unit.
The spectral coverage information data that data record unit records the image data of imaging detector output and control unit is sent.
Filter wheel, optical lens, imaging detector, the placement location of Photometer part and filter wheel direction of rotation make to filter
When the center a certain optical filter A and imaging detector center of wheel are to correspondence in next adjacent optical filter B of filter wheel
The position of the heart and Photometer part is corresponding.For filter wheel in rotary course, imaging detector and Photometer part can be simultaneously respectively with two
A adjacent filter center position is corresponding.The Photometer part measurement of the rear end optical filter B penetrates the optical signal of optical filter, through signal
Brightness information is transferred to control unit after processing unit processes.Control unit calculates filter according to the brightness information of measurement
Exposure parameter needed for mating plate B corresponds to spectral coverage.If optical filter A at this time correspond to spectral coverage exposure parameter it is known that if control imaging detection
Device acquisition image is simultaneously recorded by data record unit；If it is unknown that optical filter A corresponds to spectral coverage exposure parameter, imaging detector
Do not acquire image.When filter wheel rotation makes the position of optical filter B and imaging detector control imaging detection to control unit when corresponding to
Device light exposure exposure image as needed is simultaneously recorded by data record unit；It is measured simultaneously through next optical filter C's
Brightness information.During the cycle rotation of filter wheel, light, post-exposure are first surveyed by corresponding to spectral coverage to each optical filter, is made more
Each spectral coverage of spectrum camera can rationally expose.
A kind of rotary-type multispectral camera automatic exposure regulating method, as shown in Figure 2, the specific steps are as follows:
1) after rotary-type multispectral camera is started to work, filter wheel starts the cycle over rotation.
2) location information is sent to control unit by filter wheel, and whether control unit detection filter wheel reaches imaging and survey light
Position.
3) when control unit detect a center optical filter A in filter wheel and imaging detector position to it is corresponding when survey
Optical device measurement is through the optical signal of optical filter A in filter wheel adjacent next optical filter B, and signal processing unit is to Photometer
The current signal of part output is handled, and the brightness information obtained after processing is sent to control unit, control unit root
Imaging detector needs when optical filter B corresponds to spectral coverage imaging are calculated in the brightness information that signal processing unit exports when accordingly
Time for exposure and gain parameter and recorded.
4) control unit inquiry optical filter A corresponds to whether spectral coverage has surveyed light in a upper position for filter wheel rotation.If
Light is surveyed, then imaging detector exposure image is controlled according to the exposure parameter information that control unit after survey light obtains, and remembered by data
Record unit record optical filter A corresponds to the image data and spectral coverage information data of spectral coverage；If not surveying light, imaging detector does not expose
Imaging.
5) filter wheel cycle rotation, repeats step 2)~step 4), and data record unit records the image of each spectral coverage acquisition
Data and corresponding spectral coverage information data, until multispectral camera stops working.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (6)
1. a kind of rotary-type multispectral camera automatic exposure regulating system characterized by comprising filter wheel, optical lens, at
As detector, Photometer part, signal processing unit, control unit, data record unit；Optical lens is placed on filter wheel one
Side, imaging detector, Photometer part are placed on the filter wheel other side；
Filter wheel includes rotary wheel device and optical filter, and the optical filter on filter wheel is uniformly distributed, filter wheel in rotary course, at
As detector and Photometer part are corresponding with filter centers two adjacent on filter wheel position respectively simultaneously；Filter wheel runner dress
Photoelectric sensor is installed, whether measurement optical filter reaches imaging detector position, and the location information of optical filter is sent out in setting
Give control unit；
Optical lens uses transmitted light camera lens, and incident ray is filtered after optical lens converges by the optical filter on filter wheel
Light projects on imaging detector；
Imaging detector receives the incident light after the optical filtering of filter wheel upper filter, is exposed by time for exposure and gain adjustment
The exposure parameter setting signal of amount, imaging detector reception control unit changes exposure parameter, adopts under the control of the control unit
Collect image and exports to data record unit；
Photometer part is equipped with camera lens, and the camera lens of Photometer part is parallel with optical lens optical axis；Photometer part is received through optical filtering
The incident optical signal of piece is converted to current signal and is transferred to signal processing unit；
Signal processing unit receives the current signal of Photometer part input, according to calibrated Photometer part electric current and brightness
Relationship obtains the luminance data through optical filter, and luminance data is sent to control unit；
Control unit is stored with the time for exposure of luminance data and imaging detector and the relation database table of gain, according to signal
The luminance data that processing unit is sent calculates exposure parameter needed for optical filter corresponds to spectral coverage, and exposure parameter includes that imaging is visited
Survey time for exposure and the gain of device；Exposure parameter setting signal is sent to imaging detector by control unit, is gone in filter wheel
When imaging position, control imaging detector is configured to exposure parameter and controls imaging detector acquisition image, controls simultaneously
Spectral coverage information is sent to data record unit by unit；
The spectral coverage information data that data record unit records the image data of imaging detector output and control unit is sent.
2. a kind of rotary-type multispectral camera automatic exposure regulating system according to claim 1, it is characterised in that: described
Imaging detector is global electronic shutter face battle array cmos imaging detector or global electronic shutter area array CCD imaging detector, is led to
Cross time for exposure and the gain adjustment light exposure of imaging detector.
3. a kind of rotary-type multispectral camera automatic exposure regulating system according to claim 1 or 2, it is characterised in that:
The Photometer part uses silicon photoelectric diode or silicon photocell.
4. a kind of rotary-type multispectral camera automatic exposure regulating method, which is characterized in that comprise the following steps that
Step 1: optical lens is placed on filter wheel side, imaging detector, Photometer part are placed on the filter wheel other side；
Adjust the position of imaging detector and Photometer part so that imaging detector and Photometer part simultaneously respectively with two on filter wheel
Adjacent filter center position is corresponding；Driving filter wheel starts turning；
Step 2: optical filter location information is sent to control unit by filter wheel, control unit detection filter wheel upper filter is
No arrival imaging and survey optical position；
Step 3: when control unit detect the center some optical filter A in filter wheel and imaging detector position to it is corresponding when
The measurement of Photometer part penetrates the optical signal for next optical filter B that optical filter A is adjacent in filter wheel and will transmit through the light of optical filter B
Signal is converted to current signal and is transferred to signal processing unit；Signal processing unit receives the current signal of Photometer part input,
The luminance data through optical filter is obtained according to the relationship of calibrated Photometer part electric current and brightness, and by bright degree
According to being sent to control unit, control unit is according to the relation data of the time for exposure and gain of luminance data and imaging detector
Imaging detector when optical filter B corresponds to spectral coverage imaging is calculated in table and the luminance data of signal processing unit output at this time
The time for exposure and gain parameter that need simultaneously are recorded；
Step 4: corresponding to whether spectral coverage has carried out in a upper position for filter wheel rotation using control unit inquiry optical filter A
Survey light: if having surveyed light, controlling imaging detector exposure image according to the exposure parameter that control unit after light obtains is surveyed, and by
Data record unit record optical filter A corresponds to the image data and spectral coverage information data of spectral coverage；If not surveying light, imaging detector
Not exposure image；Exposure parameter includes time for exposure and the gain of imaging detector；
Step 5: driving filter wheel cycle rotation, repeats step 2~step 4, data record unit record incident light passes through filter
The image data and corresponding spectral coverage information data of each spectral coverage acquisition after mating plate, until completing to adopt all spectral coverage image datas
Collection and record.
5. a kind of rotary-type multispectral camera automatic exposure regulating method according to claim 4, it is characterised in that: described
Imaging detector is global electronic shutter face battle array cmos imaging detector or global electronic shutter area array CCD imaging detector, is led to
Cross time for exposure and the gain adjustment light exposure of imaging detector.
6. a kind of rotary-type multispectral camera automatic exposure regulating method according to claim 4 or 5, it is characterised in that:
The Photometer part uses silicon photoelectric diode or silicon photocell.
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| CN108777769B (en) * | 2018-05-31 | 2020-02-18 | 歌尔股份有限公司 | Camera exposure time adjusting method, device and equipment |
| CN108419026B (en) * | 2018-05-31 | 2020-05-15 | 歌尔股份有限公司 | Camera exposure time adjusting method, device and equipment |
| CN109556708A (en) * | 2019-01-04 | 2019-04-02 | 北京环境特性研究所 | Larger Dynamic range scene imaging brightness measuring device for camera and imaging luminance measuring method |
| CN110267407A (en) * | 2019-03-20 | 2019-09-20 | 合肥名德光电科技股份有限公司 | Intelligent luminaire and its control system based on image procossing |
| CN110211260A (en) * | 2019-04-23 | 2019-09-06 | 江西理工大学 | A kind of system and method carrying out intelligent recognition using optical information |
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| CN111089649A (en) * | 2020-01-21 | 2020-05-01 | 敦煌研究院 | Multispectral light source and multispectral imaging system |
| CN112153380B (en) * | 2020-09-29 | 2024-04-16 | 广东弓叶科技有限公司 | Multispectral camera, multispectral camera parameter calculating method and device |
| CN113542596B (en) * | 2021-06-29 | 2022-08-19 | 中国科学院长春光学精密机械与物理研究所 | Imaging control method of CCD imager |
| CN115426459B (en) * | 2022-08-30 | 2024-05-21 | 广州星博科仪有限公司 | Multispectral camera and pre-exposure optimization method thereof |
| CN115174820B (en) * | 2022-09-06 | 2022-11-25 | 安徽科大擎天科技有限公司 | Quick adjusting method for automatic exposure of camera |
| CN115265786B (en) * | 2022-09-30 | 2023-01-10 | 长春理工大学 | Strong light polarization detection device capable of automatically adjusting exposure value and detection method thereof |
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