CN106303308A - Camera head - Google Patents
Camera head Download PDFInfo
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- CN106303308A CN106303308A CN201610373320.0A CN201610373320A CN106303308A CN 106303308 A CN106303308 A CN 106303308A CN 201610373320 A CN201610373320 A CN 201610373320A CN 106303308 A CN106303308 A CN 106303308A
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- Prior art keywords
- period
- light
- imaging apparatus
- shutter
- camera head
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/53—Control of the integration time
- H04N25/531—Control of the integration time by controlling rolling shutters in CMOS SSIS
-
- 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
-
- 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
- H04N23/745—Detection of flicker frequency or suppression of flicker wherein the flicker is caused by illumination, e.g. due to fluorescent tube illumination or pulsed LED illumination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/53—Control of the integration time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
- H04N25/61—Noise processing, e.g. detecting, correcting, reducing or removing noise the noise originating only from the lens unit, e.g. flare, shading, vignetting or "cos4"
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Devices (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
The present invention provides a kind of in the case of using the imaging apparatus for every line storage and output electric charge corresponding with light light quantity, it is possible to effectively suppresses flicker, and can suppress the camera head of photographed images distortion.Camera head (1) possesses: imaging apparatus (40), stores for every line and exports electric charge corresponding with light light quantity；Lens (10), make the light from target area in imaging apparatus (40) imaging；Shutter (30), is arranged in side, target area relative to imaging apparatus (40)；And control portion (50).Imaging apparatus (40) is controlled by control portion (50), so that the part during the electric charge in each line on imaging apparatus (40) stores is overlapped, and the detection of AC wave shape of based on commercial ac power source repeat to light with the luminous source extinguished light period, and during wired electric charge stores overlapped repeat to store during with light during in overlapping period, shutter (30) is opened.
Description
Technical field
The present invention relates to a kind of camera head that target area is imaged, be particluarly suitable for the landscape comprising signal lights
Use when imaging.
Background technology
Known have the camera head utilizing CCTV camera to image street or intersection.At this camera head
In, photographed images is such as used for vehicle accident verification etc..In verification, except confirming the situation of vehicles or pedestrians, also
That wants confirmation letter signal lamp lights situation.It is to say, which kind of of red, blue, yellow signal lights be with during confirmation accident
Color is lighted.
In recent years, the light source of signal lights uses light emitting diode.If utilizing commercial ac power source driven for emitting lights diode, then
Light emitting diode can repeat to light and extinguish with the short cycle.Therefore, the signal lights with light emitting diode as light source also can be respectively
When lighting of color, repeated to light and extinguish with the short cycle.If signal lights is lighted with the short cycle like this and extinguishes, then signal
The brightness of the photographed images of lamp changes in interframe, and the photographed images of signal lights produces flicker (flicker).If the shooting of signal lights
Image produces flicker, then in verification, it is possible to causing cannot the situation that light color of confirmation letter signal lamp equitably.
In following patent documentation 1, describe and can suppress because of LED (light-emitting diode, light emitting diode)
The camera head of the flicker of the generations such as illumination.This camera head performs following control, i.e. when being judged to have flicker,
The electric charge scanning frequency pulse relative to CCD (Charge Coupled Device, charge coupled cell) sensor is changed in each field
With the sequential of electric charge read pulse, and can the same phase part of light period of illumination for exposure at each field shooting machine.
[prior art literature]
[patent documentation]
[patent documentation 1] Japanese Patent Laid-Open 2011-193065 publication
Summary of the invention
[inventing problem to be solved]
In the maneuver of described patent documentation 1, need to change the sequential of electric charge scanning frequency pulse and electric charge read pulse in each field
Deng the control that ccd sensor is intrinsic.Therefore, the maneuver of patent documentation 1 cannot directly utilize in using ccd sensor
The image capture method of imaging apparatus in addition.
In view of this problem, it is an object of the invention to provide one and using for every line storage and exporting and light light quantity
In the case of the imaging apparatus of corresponding electric charge, it is possible to effectively suppress flicker, and taking the photograph of photographed images distortion can be suppressed
As device.
[solving the technological means of problem]
The Main Morphology of the present invention relates to a kind of camera head.The camera head of this form possesses: imaging apparatus, for often
Bar line stores and exports electric charge corresponding with light light quantity；Lens, make the light from target area become at described imaging apparatus
Picture；Shutter, is arranged in side, described target area relative to described imaging apparatus；And control portion.Described control portion is to institute
State imaging apparatus to be controlled, so that a part of phase mutual respect during the electric charge storage in each line on described imaging apparatus
Folded, AC wave shape based on commercial ac power source detection repeats to light and the lighting period of the luminous source extinguished, and about
All described lines and electric charge during storing overlapped repeat to store during light in overlapping period period with described, general
Described shutter is opened.
According to the camera head of this form, owing to shutter being beaten in period overlapping with lighting period during repeating to store
Open, even if so in the case of signal lights etc. was lighted with the short cycle imaging with the luminous source extinguished, it is possible to suppression
The light carrying out self-emitting light source in each shooting cycle is easily received by imaging apparatus, and carrys out total light light quantity of the light of self-emitting light source
The situation that frame difference is big.Therefore, it is possible to effectively suppress the flicker that the photographed images of luminous source produces.Further, since
Repeat store during in imaging apparatus exposure, so to institute wired with identical sequential and exposure during, irradiation target area
The light in territory.Therefore, even if in the case of the subject of high-speed mobile is included in target area, the photographed images of subject
Also distortion will not be produced.
The camera head of this form can be set to the composition possessing the circuit part being supplied to electric power from commercial ac power source.In these feelings
Under condition, the AC wave shape of described control portion commercial ac power source based on supply to described circuit part, detects described luminous source
Light period.
In more detail, described AC wave shape waveform after all wave rectification is exceeded set in advance lighting by described control portion
The period of threshold value be set to described luminous source light period detect.Thus, it is possible to successfully examined by simple process
That surveys luminous source lights period.Additionally, the circuit part in this composition such as can be set to adjust from commercial ac power source supply
Electric power the power circuit in each portion supplied to camera head.
Or, described control portion can be set to constitute as follows: comprises described sending out from the image contract imaged by described imaging apparatus
The region of light source, brightness based on the region extracted, that detects described luminous source lights period.Then, even if taking the photograph
In the case of being not attached to commercial ac power source as device, it is also possible to that detects luminous source lights period.
In this case, described control portion can be set to constitute as follows: each shooting cycle is repeated below process, i.e. from
Described repeat to store during in specific time sequence open described shutter and the image imaged by described imaging apparatus, extraction is wrapped
Containing the region of described luminous source, and obtain the brightness in extracted region, become maximum based on acquired described brightness
Described shutter in the described shooting cycle open sequential, detect described luminous source light period.
It addition, described control portion can be set to constitute as follows: cannot comprise from the image contract imaged by described imaging apparatus
In the case of the described region of described luminous source, changing the sequential of opening of described shutter, extraction comprises the institute of described luminous source
State region.Thus, it is possible to order and promptly extraction comprise the region of luminous source.Therefore, it is possible to set smoothly and promptly
Pinpoint bright period, it is possible to the flicker of the luminous source in suppression photographed images effectively.
It addition, described control portion can be set to constitute as follows: repeat described luminous source under given conditions lights period
Detection process, carry out described in light period reset.Period T3 is lighted thus, it is possible to dynamically adjust, thus
Precision can set well and light period T3.
In the camera head of this form, described control portion can be set to constitute as follows: produces repeatedly institute a shooting cycle
State during repeating to store with described light overlapping period period in the case of, use described repeat during storage with described point
One or more periods that bright period is overlapping, set described shutter based on shutter speed opens period.Thus, it is possible to
The most light quantities are guided imaging apparatus.Therefore, it is possible to more effectively suppress flicker.
Additionally, in the camera head of this form, the luminous source for example, signal lights of shooting object.In this case, energy
Enough flickers of the signal lights in suppression photographed images, such as in the verification of vehicle accident, it is possible to confirmation letter signal lamp equitably
Light color.
[invention effect]
As it has been described above, according to the present invention, it is possible to provide a kind of can effectively be suppressed taking the photograph of flicker by additional being simply formed
As device.
Effect or the meaning of the present invention should be more than you know by the explanation of embodiment shown below.But, shown below
Embodiment only for implement the present invention time an illustration, the present invention is not exposed in the record of implementation below
Any restriction held.
Accompanying drawing explanation
Fig. 1 (a) is the figure of the outward appearance composition of the image management system representing embodiment.Fig. 1 (b) represents embodiment
The figure of one example of photographed images.
Fig. 2 is the figure of the composition of the camera head representing embodiment.
Fig. 3 is the figure of the composition of the cmos image sensor representing embodiment.
Fig. 4 (a), (b) are the figures reading control of the cmos image sensor that embodiment is described.
Fig. 5 is the sequential chart of the control method of the shutter representing embodiment.
Fig. 6 is the sequential chart of the control method of the shutter representing embodiment.
Fig. 7 is the sequential chart of the control method of the shutter representing comparative example.
Fig. 8 is the sequential chart of the control method of the shutter representing comparative example.
Fig. 9 (a), (b) are the figures of the control method of the cmos image sensor that modification is described.
Figure 10 is the sequential chart of the control method of the shutter representing another modification.
Detailed description of the invention
Hereinafter, referring to the drawings embodiments of the present invention are illustrated.
Fig. 1 (a) is the figure of the outward appearance composition of the image management system representing embodiment.
As shown in Fig. 1 (a), image management system possesses camera head 1 and external device (ED) 2.Camera head 1 is that monitoring is taken the photograph
Camera, and the street comprising signal lights or intersection etc. can be arranged on imaging thing 3 is set.It is set
The outer wall of thing 3 for example, building etc. or the structure on roof, wire pole etc..The figure that camera head 1 will image
As recording at any time at internal record medium.External device (ED) 2 is the personal computer of taking.Additionally, external device (ED) 2
It is alternatively other the portable data assistance such as mobile phone, flat board.
Record the image at camera head 1 suitably to be reclaimed by external device (ED) 2.Camera head 1 can profit with external device (ED) 2
Communicate with WLAN (local area network, LAN).The communication lines of WLAN established by external device (ED) 2
Footpath, downloads image from camera head 1.Communication between camera head 1 and external device (ED) 2 is not limited to wireless
LAN, it is possible to for other the communication mode such as bluetooth.
Fig. 1 (b) is the figure of the example representing the photographed images imaged by camera head 1.Herein, the friendship of signal lights 4 is comprised
Cross road mouth 5 is set in target area.For convenience, the most graphic direction towards camera head 1 in Fig. 1 (b)
Signal lights 4.After the image imaged by camera head 1 is reclaimed by external device (ED) 2, such as, it is used in vehicle accident
Verification etc..In this verification, except confirming the situation of the vehicles or pedestrians advanced in intersection 5, also want confirmation signal
Lamp 4 light situation.It is to say, signal lights 4 is with red, blue, which kind of color dot of yellow during confirmation accident
Bright.
Fig. 2 is the figure of the composition representing camera head 1.
Camera head 1 possess lens 10, aperture 20, shutter 30, imaging apparatus 40, control portion 50, storage part 60,
Communication unit 70 and power circuit 80.
Lens 10 obtain the light from target area, and make the picture sensitive surface imaging at imaging apparatus 40 of target area.
In the way of suitable light quantity is incident to imaging apparatus 40 by the power according to the light from target area by aperture 20, limit
Make from outside light.Aperture 20 adjusts aperture amount by aperture drive circuit 21.
Shutter 30 is liquid crystal shutter.Shutter 30 for example, when being applied with voltage transmitance become maximum, if resistance
Power-off pressure applies, and the what is called of transmitance step-down has the liquid crystal shutter of the characteristic of normally-black mode.In this case, shutter 30
Make light transmission when being applied with voltage, when no applied voltage, light is interdicted.Additionally, shutter 30 is also
Can be that transmitance becomes maximum when no applied voltage, if applying voltage, the what is called of transmitance step-down has Chang Bai
The liquid crystal shutter of the characteristic of mode.As long as it addition, shutter 30 can be able to be the most also the fast of other modes with high speed opening and closing
Door.Shutter 30, by the driving signal from fast gate drive circuit 31, switches open and-shut mode.
Imaging apparatus 40 is CMOS (complementary metal oxide semiconductor, CMOS (Complementary Metal Oxide Semiconductor) half
Conductor) imageing sensor.Imaging apparatus 40 is respectively provided with photodiode in the position corresponding with each pixel on sensitive surface.
Imaging apparatus 40 is controlled by camera signal processing circuit 41, carries out the electric charge relative to photodiode for every line
Store and output.
Control portion 50 possesses the arithmetic processing circuits such as CPU (Central Processing Unit, central processing unit), and according to
Each portion is controlled by the program being saved in storage part 60.Storage part 60, in addition to preserving the program controlled, goes back quilt
As the working region during control in control portion 50.According to being saved in the program of storage part 60, and control portion 50 is to light
Circle drive circuit 21, fast gate drive circuit 31, camera signal processing circuit 41 are controlled.Communication unit 70 and Fig. 1 (a)
Shown external device (ED) 2 communicates.
Power circuit 80 is connected to commercial ac power source, and supply after the electric power supplied from commercial ac power source is adjusted to
Each portion in camera head 1.It addition, the alternating voltage all wave rectification that power circuit 80 will supply from commercial ac power source
Rear supply is to control portion 50.As described below, control portion 50 current waveform in full-wave rectifier based on commercial ac power source, detection letter
Signal lamp 4 light period.
Fig. 3 is the figure of the composition schematically showing imaging apparatus 40.For convenience, illustrate in figure 3 and 9
The composition of the part that individual pixel is corresponding, but it practice, identical be formed in longitudinally and the most corresponding with specific pixel count and
Configuration.
Imaging apparatus 40 has photodiode 40a in the position corresponding with each pixel.If photodiode 40a receives light,
Then store electric charge corresponding with light light quantity.The electric charge being stored is converted to voltage by amplifier 40b, and is exaggerated.
If switch 40c opens (ON), then the voltage being exaggerated is transferred into vertical signal line 40d for every line L.Transmitted
Voltage by the column circuits 40e temporary safe-keeping configured for every vertical signal line 40d.If column select switch 40f beats
Open, then the voltage taken care of is transferred into horizontal signal lines 40g.Then, the voltage of horizontal signal lines 40g it is transferred into
It is transferred into camera signal processing circuit 41.So, in imaging apparatus 40, send voltage signal for every line L.
It addition, imaging apparatus 40 to carry out the side of the storage of the electric charge relative to photodiode 40a for every line L
Formula is controlled.It is to say, the photodiode 40a on a line L was set as storing electric charge in specific period
State, if through during this period, then in each photodiode 40a on this line L, produced electric charge is output.This control
Make and carry out successively from the line L of uppermost towards the line L of lowermost.When online L is in the state that can store electric charge, if
Photodiode 40a on line L is irradiated light, then electric charge corresponding with the light quantity of irradiated light is stored on this line
Each photodiode 40a.The electric charge so stored is read for every line L in this way, is converted to voltage signal
Rear output is to camera signal processing circuit 41.
Hereinafter, Jiang Gexian is set so as to store the period of the state of electric charge referred to as " during electric charge stores ".
Being back to Fig. 2, each line on imaging apparatus 40 is set as that electric charge stores the phase by camera signal processing circuit 41 successively
Between, and the reading of electric charge is carried out for every line.Camera signal processing circuit 41 possess A/D (analog to digital,
Analog/digital) change-over circuit, the electricity of every line that will supply from imaging apparatus 40 via horizontal signal lines 40g (with reference to Fig. 3)
Pressure signal is converted to digital signal, and exports to control portion 50.Control portion 50 makes to supply from camera signal processing circuit 41
Digital signal (luminance signal) be stored in storage part 60.Consequently, it is possible to by exporting from camera signal processing circuit 41
Wired (1 frame sign) luminance signal constitute 1 photographed images.
Fig. 4 (a), (b) are the figures reading control that imaging apparatus 40 is described.Fig. 4 (a) is to schematically show with normally
The figure of speed control (hereinafter referred to as " normal readout mode ") in the case of each line carries out the reading of electric charge, Fig. 4 (b)
It is to schematically show with at a high speed control in the case of each line carries out the reading of electric charge (hereinafter referred to as " high speed readout mould
Formula ") figure.
In Fig. 4 (a), the left side of (b), it is schematically indicated the sensitive surface of imaging apparatus 40 and each line L.Herein,
The line L of epimere is set to L0, and the line of lowermost is set to Ln.It addition, on Fig. 4 (a), the right side of (b), it is schematically indicated
Control sequential to each line.
With reference to Fig. 4 (a), in normal readout mode, the control to the line L0 of uppermost is to start in sequential t1, time
Sequence t2 terminates.It is to postpone only to start after special time than sequential t1 to the control of the line L2 of lower 1 section.Consequently, it is possible to it is every
Start sequential when line L changes to hypomere and just postpone special time, carry out the control to each line successively.The line of lowermost
The beginning sequential of Ln becomes sequential t2 postponing Δ t than sequential t1.
In the line L0 of uppermost, storing electric charge from the period of sequential t1 to sequential t2.Such as, from sequential t1 to
During period Δ t between sequential t2 is electric charge storage.For other lines L, during setting electric charge storage similarly.
Sequential t2 after have passed through period Δ t from sequential t1, performs electric charge reading to the line L0 of uppermost.
About the line L1 of the 2nd section, the sequential after postponing special time than sequential t1 starts electric charge and stores, than sequential
T2 postpones the sequential after special time and performs electric charge reading.Consequently, it is possible to when line L changes, the beginning that electric charge stores
Sequential just postpones special time, and the execution sequential that electric charge reads also postpones special time.Electric charge to the line Ln of lowermost
The beginnings sequential stored becomes and is delayed sequential t2 after Δ t than sequential t1, and the execution sequential of electric charge reading becomes and compares sequential
T2 is delayed sequential t3 after Δ t.
So, in normal readout mode, the end sequential of the electric charge storage of the line L0 of uppermost is become lowermost
Line Ln electric charge store beginning sequential.Therefore, in normal readout mode, wired electric charge storage will not be produced
Deposit the period of period overlap.
With reference to Fig. 4 (b), in high speed readout pattern, by improving the electric charge reading speed to each line L, the control between line L
System starts the side-play amount of sequential and shortens than normal readout mode.In the example of Fig. 4 (b), controlling between line L starts sequential
Side-play amount reduces half than normal readout mode.Therefore, to the beginning sequential only comparison of the control of the line Ln of lowermost
Beginning sequential t1 of the control of the line L0 of epimere postpones Δ t/2.
By by bit when making bit number during charge signal specimen (the A/D conversion) of each line compare normal readout mode
Number is cut down further, and the electric charge reading speed of each line L is able to high speed.This process is control portion 50 based on Fig. 2
Control under, camera signal processing circuit 41 carry out.In high speed readout pattern, cut down specimen ratio as mentioned above
Special number, so compared with normal readout mode, the image quality of photographed images somewhat deteriorates.But, this deterioration is at monitoring camera
It the purposes such as machine is the visibility deterioration without the degree of special problem.Or, it is also possible to by imaging apparatus 40 and shooting
The improvement of signal processing circuit 41, high speed, and save as equal specimen bit number.
So, by by the control model of imaging apparatus 40 is set as high speed readout pattern, as shown in Fig. 4 (b), produce
Raw wired electric charge during storing overlapped repeat to store during.And, by carrying out during repeating to store at this
Exposure, and each line L is irradiated the light from target area with identical sequential, and to photodiode on wired L
40a stores electric charge with identical sequential and light exposure.Therefore, it is possible to the photographed images of the subject of suppression high-speed mobile is produced
Raw distortion.It is to say, Rolling shutter phenomenon is inhibited, thus realize using the global shutter merit of imaging apparatus 40
Energy.
In the present embodiment, the control model of imaging apparatus 40 is set as high speed readout pattern.And, repeating
During storage, shutter 30 is opened, by the light directing imaging apparatus 40 from target area.
Fig. 5 is the sequential chart of the control method representing shutter 30.
The uppermost of Fig. 5 is the voltage waveform of commercial ac power source.Herein, it is contemplated that the frequency of commercial ac power source is 50Hz.
In this case, the cycle T 1 of the voltage waveform of commercial ac power source is 1/50 second.Signal lights 4 each at Fig. 1 (b)
In the case of the light source of color uses light emitting diode, light emitting diode is as shown in the 2nd section from the top of Fig. 5, with commercialization
The alternating voltage of alternating current power supply voltage after all wave rectification is driven.The cycle T 2 of the voltage waveform after all wave rectification
It it is 1/100 second.Light emitting diode exceedes at the voltage after all wave rectification to be lighted the period T3 of threshold value SH1 and lights.Cause
This, the assorted signal lights of the signal lights 4 of Fig. 1 (b) is lighted with cycle T 2 that is 1/100 second cycle and extinguishes.
In contrast, imaging apparatus 40 was constituted the photographed images of 1 frame sign with 1/60 second cycle.It is to say, shooting
The shooting cycle T 4 of device 1 is 1/60 second, with lighting and extinguishing cycle that is 1/100 of the assorted signal lights of signal lights 4
Phase offset.Therefore, the fixed position in during repeating shown in Fig. 4 (b) stores sets the exposure of special time width
In the case of period, during exposure with signal lights 4 (light emitting diode) light period overlapped time width for
Every frame change.Therefore, the brightness of the photographed images of signal lights 4 is different in interframe, and the photographed images of signal lights 4 produces dodges
Bright.
Fig. 7 is the feelings during the exposure of the fixed position setting special time width being shown schematically in shooting cycle T 4
Under condition, the sequential chart of the light light quantity that the light from signal lights 4 (light emitting diode) is received by imaging apparatus 40.Herein,
During the terminal of shooting cycle T 4 only sets exposure so that time width T7 opens shutter 30.In this case, come
Period T81～T83 being extracted to imaging apparatus 40 from the light of signal lights 4 (light emitting diode) changes in interframe.Therefore,
As Fig. 7 lowermost schematically shown in, relative to the imaging apparatus 40 of light from signal lights 4 (light emitting diode)
Light light quantity is the most different for every frame.Thus, the image of signal lights 4 produces flicker.
Fig. 8 is to be shown schematically in the case of the time width T7 shortening of Fig. 7, from signal lights 4 (luminous two
Pole is managed) the sequential chart of light light quantity that received by imaging apparatus 40 of light.Such as, the target area such as daytime at fine day is bright
In the case of bright, time width T7 (shutter speed) shortens.In this case, also identical with Fig. 7, in shooting cycle T 4
Terminal only set exposure so that time width T7 opens shutter 30 during.In this case, (luminous from signal lights 4
Diode) light be extracted to period T81, T82 of imaging apparatus 40 and change in interframe.It addition, from the from left to right the 3rd
During individual shooting, due to during exposure with signal lights 4 (light emitting diode) to light period T3 the most overlapping, so from
The light of signal lights 4 (light emitting diode) is not extracted to imaging apparatus 40.
Therefore, as Fig. 8 lowermost schematically shown in, relative to taking the photograph of the light from signal lights 4 (light emitting diode)
The light light quantity of element 40 is the most different for every frame, and thus, the photographed images of signal lights 4 produces flicker.Separately
Outward, in the frame corresponding with during the from left to right the 3rd shooting, due to without relative to from signal lights 4 (light emitting diode)
The light light quantity of imaging apparatus 40 of light, so becoming the photographed images of the signal lights 4 without illuminating state.
In contrast, in the present embodiment, as it is shown in figure 5, repeating storage period T5 and signal lights 4 (luminous two
Pole manage) light period T3 overlap during, shutter 30 is opened.Therefore, signal lights 4 (light emitting diode) is lighted
Period T3 easily comprise shutter 30 open period, with Fig. 7,8 situation compared with, be not likely to produce signal lights 4
Light the frame of gaps and omissions.In Figure 5, period T3 is lighted repeat to store period T5 and signal lights 4 (light emitting diode)
In overlapping period T61, T62, T62', T63, shutter 30 is opened.Thus, with Fig. 7,8 situation compared with,
The difference of the interframe that the light from signal lights 4 (light emitting diode) is extracted to total light light quantity of imaging apparatus 40 diminishes.
Therefore, the photographed images of signal lights 4 is not likely to produce flicker.
Herein, the period T3 that lights of signal lights 4 (light emitting diode) is based on the AC commercial supplied from power circuit 80
The current waveform in full-wave rectifier of power supply and be detected.As shown in Fig. 1 (b), owing to camera head 1 is to image signal lights 4
Camera head, so being arranged in the vicinity of signal lights 4.Therefore, the friendship of the commercial ac power source to signal lights 4 is supplied
Stream waveform is roughly the same to the AC wave shape phase place of camera head 1 with supply.Therefore, in camera head 1, it is possible to base
In the AC wave shape of supply to the commercial ac power source of self, that detects signal lights 4 (light emitting diode) lights period T3.
Specifically, as with reference to illustrated by Fig. 5, to the AC wave shape all wave rectification of the commercial ac power source being fed to self
Wave setting lights threshold value SH1, is exceeded by the waveform of all wave rectification and lights period of threshold value SH1 and be set to the point of signal lights 4
Bright period T3 detects.It is to say, complete by the commercial ac power source that supplies from power circuit 80 of control portion 50
Ripple rectified waveform exceed the period lighting threshold value SH1 set in advance be set to signal lights 4 (light emitting diode) light period
T3 detects.
Additionally, for light period T3 judgement light threshold value SH1 by being envisaged for the light-emitting diodes of signal lights 4
Pipe sets.The light emitting diode for signal lights 4 can exist multiple in the case of, by the point of various light emitting diodes
In bright threshold value the highest light that threshold value is set as judgement for lighting period light threshold value SH1.Or, it is possible to will compare
The highest light the highest voltage value of threshold value be judgement for lighting period light threshold value SH1.By so
Set and light threshold value SH1 for judge, no matter which kind of light emitting diode is used for signal lights 4, at commercial ac power source
Current waveform in full-wave rectifier exceed be set light threshold value SH1 during, signal lights 4 all can be lighted.
Consequently, it is possible to detection signal lights 4 (light emitting diode) light period T3 after, control portion 50 is to having examined
Survey light period T3 and repeat store period T5 repetition sequential detect.And, control portion 50 is in the phase of lighting
Between T3 with repeating to store the period that period T5 repeats, shutter 30 is set as ON (opening) state.Such as, control portion 50
Lighting period T3 and repeating to store the sequential repeating to start of period T5, shutter 30 switched to ON (opening) state,
Then, shutter 30 based on shutter speed open period terminate or light period T3 with repeat storage during
The sequential repeating to terminate of T5, switches to OFF (closedown) state by shutter 30.
Such as, in the example of Fig. 5, the period T3 that lights repeating to store period T5 and signal lights 4 (light emitting diode) weighs
It is longer that folded period T61 opens period than shutter 30 based on shutter speed.Therefore, in period T61, in the phase
Between before T61 terminates, shutter 30 is switched to OFF (closedown) state.In contrast, in period T62, based on
The shutter 30 of shutter speed open period more longer than period T61.Therefore, in period T62, lighting period T3
With repeat store period T5 repeat terminate sequential, shutter 30 is switched to OFF (closedown) state.
Additionally, in the example of Fig. 5, from the from left to right the 2nd shooting cycle T 4, signal lights 4 light period T3 and
The period repeating to store period T5 repetition is period T62 and period T62' these 2 times.In this case, due to period T62
In shutter 30 open period than shutter based on shutter speed open period shorter, so control portion 50 is the 2nd
The period T62' of secondary appearance make shutter 30 open again.In this case, control portion 50 is with the period T62 of the 1st time
Process after not enough shutter open period, in the period T62' of the 2nd time, open shutter 30.Thus, from from left to right
2 shooting cycle T 4 extract to the light summation of imaging apparatus 40 close to light quantity based on shutter speed.
As previously discussed, by repeat to store period T5 and signal lights 4 (light emitting diode) to light period T3 overlapping
Period T61, T62, T62', T63 in shutter 30 is opened, and with Fig. 7,8 situation compared with, from signal lights
The difference of the interframe that the light of 4 (light emitting diodes) is extracted to total light light quantity of imaging apparatus 40 diminishes.Thus, signal
The photographed images of lamp 4 is not likely to produce flicker.
Additionally, such as, in the case of the target area such as daytime of fine day is bright, must be higher by shutter speed settings, as
Shown in Fig. 6, shorter during the ON of shutter 30.Thus, from the light quantity of target area extraction to the light of imaging apparatus 40
Reduce.Even if in this case, also as shown in the lowermost of Fig. 6, from the light of signal lights 4 (light emitting diode) by really
Extract on the spot to imaging apparatus 40.It addition, the light from signal lights 4 (light emitting diode) is extracted to imaging apparatus 40
The difference of the interframe of total light light quantity diminishes.Thus, the photographed images of signal lights 4 is not likely to produce flicker.
Effect ＞ of ＜ embodiment
According to present embodiment, play following effect.
As shown in Figures 5 and 6, due to repeat to store the period T5 period T61 overlapping with lighting period T3, T62,
Shutter 30 is opened in T62', T63, so even imaging with the signal lights 4 extinguished lighting with the short cycle
In the case of, it is possible to suppression light from signal lights 4 in respective shooting cycle T 4 is easily received by imaging apparatus 40,
And from total light light quantity of light of signal lights 4 in the most different situation of interframe.Thereby, it is possible to effectively suppress letter
The flicker produced in the photographed images of signal lamp 4.Further, since expose repeating to store imaging apparatus 40 in period T5,
So to wired during identical sequential and exposure, irradiate the light of target area.Therefore, even if at the quilt of high-speed mobile
Taking the photograph in the case of body is included in target area, the photographed images of subject also will not produce distortion.
Further, since the waveform that the AC wave shape from commercial ac power source carries out all wave rectification is exceeded by control portion 50
The period lighting threshold value SH1 set in advance is set to the period T3 that lights of described luminous source and detects, it is possible to logical
That crosses simple process successfully detection signal lights 4 lights period T3.
Further, since control portion 50 produces a shooting cycle T 4 in described control portion, and storage period T5 is repeated several times
In the case of the period (T62, T62') overlapping with lighting period T3, period T62 is not only used also to use period T62',
Set shutter 30 based on shutter speed opens period, it is possible to the most light quantities are guided imaging apparatus 40.
Therefore, it is possible to more effectively suppress flicker.
It addition, shutter 30 is liquid crystal shutter, shutter 30 as shown in Figures 5 and 6, is entered by control portion 50 in a pulsed manner
Row ON/OFF control.Thus, even if in the case of period as period T62 is shorter, it is also possible to correctly carry out
The opening and closing of shutter 30.
＜ modification ＞
In said embodiment, as shown in Fig. 4 (b), by the control model of imaging apparatus 40 is set as high fast reading
Exit pattern produces during repeating to store, but also can be as shown in Fig. 9 (b), by the control model of imaging apparatus 40 being set
Be set to low-speed mode produce repeat store during.In low-speed mode, it is set as during the shooting of each line shown in Fig. 9 (a)
2 times of normal readout mode, i.e. 2 Δ t.In this case, shutter 30 is also identical with described embodiment, is repeating
During storage with signal lights 4 (light emitting diode) light period overlapping during open.Thus, also with described enforcement
Mode is identical, it is possible to produced flicker in the photographed images of suppression signal lights 4, and suppression acquisition comprises without illuminating state
The photographed images of signal lights 4.
It addition, in said embodiment, the AC wave shape inspection of commercial ac power source based on supply to power circuit 80
That surveys signal lights 4 lights period T3, but also can as described below, based on the photographed images imaged by imaging apparatus 40,
That detects signal lights 4 lights period T3.
It is to say, in this modification, the camera watch region of imaging apparatus 40 is such as divided into level 8 block, hangs down
The region of total 64 block of straight 8 blocks.And, the image information exported from respective region by fourier transform,
And for each region, detection flicker frequency, the frequency of the frame frequency i.e. corresponding to image information take with by fourier transform
The difference of the frequency in each region obtained.Do not comprise signal lights 4 grade to light and the flicker in the region of luminous source extinguished with the short cycle
Frequency (differences of two frequencies) is zero, and lights and inspection in the region of the luminous source extinguished with the short cycle comprising signal lights 4 etc.
Survey flicker frequency.Therefore, in the region detecting flicker frequency, can determine that as there is signal lights 4.Additionally, no matter
Signal lights 4 is photographed, in the case of all not detecting flicker frequency, makes the sequential of opening of shutter 30 move, inspection
Survey flicker frequency.Consequently, it is possible to detecting that the regional determination of flicker frequency is for existing signal lights 4.
Secondly, about comprising the region of signal lights 4, for each shooting cycle T 4, the aggregate value obtaining brightness (is always subject to
Light light quantity).In this case, such as, as shown in Figure 10, the period of opening of shutter 30 is set as and the luminescence of imagination
Diode light period T3 same degree.Thus, signal lights 4 light period T be included in repeat store during
T5 and shutter 30 open period both in the case of, in the region comprising signal lights 4, from signal lights 4
The light light quantity of light becomes maximum.In the example of Figure 10, in period T63, the light light quantity of signal lights 4 becomes maximum.
Therefore, it is possible to by the shutter 30 in period T63 open period be set to signal lights 4 light period detect.
Control portion 50 by such process, obtains the region that is judged to comprise signal lights 4 in each shooting cycle T 4
The aggregate value (total light light quantity) of brightness, opening of the shutter 30 when the aggregate value (total light light quantity) of brightness is become maximum
Period is set to one of the period T3 that lights of signal lights 4 and detects.And, control portion 50 will have been detected as lighting
Period T3 repeats to set with the ignition period (in the case of commercial ac power source is as 50Hz, be 1/100 second) of signal lights 4
Fixed, be set in each shooting cycle T 4 lights period T3.
Additionally, in this modification, it is necessary to before carrying out the shutter control of Fig. 5 and Fig. 6, perform described process, sentence
That determines signal lights 4 lights period T3.It addition, it can be desirable to start Fig. 5 and Fig. 6 shutter control after, also
Being appropriately performed described process with specific condition, reset signal lights 4 lights period T3.Such as, letter is being carried out
After the setting lighting period T3 of signal lamp 4, the sequential through fixing period carries out described process and carries out lighting period T3
Reset.Or, exist because of have a power failure or temporary interruption, the increase etc. of circuit noise and light period T3 generation
In the case of the probability of skew, carry out described process and carry out lighting resetting of period T3.By the most dynamically
Ground adjusts and lights period T3, it is possible to precision sets well lights period T3.
According to this modification, in the case of the battery that power supply is switch type of camera head 1 etc., camera head 1 does not connects
In the case of being connected on commercial ac power source, it is also possible to that detects signal lights 4 lights period T3.
Additionally, in this modification, comprise the region of signal lights 4 based on flicker frequency detection, but comprise signal lights 4
The detection method in region is not limited to this, such as, both can using comprise with signal lights 4 light corresponding image as quiet
Only the region detection of image only special time is the region comprising signal lights 4, it is possible in the feelings that imaging apparatus 40 is colour
Under condition, using lighting of comprising signal lights 4, color is i.e. green, red, the image of yellow is as rest image only special time
Region detection be the region comprising signal lights 4.It addition, the method distinguishing camera watch region is also not limited to level 8 district
Block, vertical 8 blocks, it is possible to utilize additive method to distinguish.
And then, light the decision method of period T3 and be also not limited to described, such as, it is possible to repeat to store during
Making shutter 30 open during T5 is identical, the aggregate value of the brightness in being judged to the region comprising signal lights 4 (is always subject to
Light light quantity) become maximum and repeat to store that period T5 is judged to comprise signal lights 4 lights period T3.In this case,
Such as, the aggregate value (total light light quantity) of brightness both can have been become the middle sequential repeating storage period T5 of maximum as letter
The middle sequential lighting period T3 of signal lamp 4, set signal lights 4 lights period T3, it is possible to utilize additive method,
The aggregate value (total light light quantity) of brightness become maximum repeat to store period T5 in setting light period T3.
Above, embodiments of the present invention and modification are illustrated, but the present invention not by described embodiment and
Any restriction of modification, it addition, embodiments of the present invention also are able to the various changes carried out in addition to described.
Such as, in said embodiment, as shown in Figures 5 and 6, period T3 and repetition are lighted at signal lights 4
Storage period T5 starts the sequential of overlap and shutter 30 switches to ON (opening) state, but the changing method of shutter 30 is also
Be not limited to this, if be set as light period T3 with repeat store period T5 overlapping during shutter 30 be
ON (opening) state, it is possible to utilize other changing method.
It addition, in said embodiment, as it is shown in figure 5, in a shooting cycle T 4, at the point of signal lights 4
Bright period T3 with repeat to store period T5 overlapping period exist multiple in the case of, first, during initial overlap
Carry out opening of shutter 30, utilize this to open and based on shutter speed open period deficiency in the case of, follow-up
Overlap during shutter 30 is opened.But, there is the shutter in the case of during multiple overlap in a shooting cycle T 4
Control be not limited to this, such as, both can during last overlap successively set shutter 30 open period, directly
To corresponding with shutter speed open period enough, or, it is possible to open period impartial by corresponding with shutter speed
Distribute to all overlaps during.
It addition, in said embodiment, shooting object is signal lights 4, but shooting object may not be signal lights 4, also
Can be to light and other luminous sources extinguished with the short cycle.
It addition, in said embodiment, camera head 1 is arranged on outer wall or the structure on roof, the electricity of building etc.
Line pole etc., such as, it is possible to comprise the composition of camera head 1 integratedly at street lamp etc..
And then, camera head 1 is not limited to CCTV camera, it is possible to for possessing other shootings of image pickup part, storage part
Device.The present invention can be suitably applied to use the shooting storing and exporting electric charge corresponding with light light quantity for every line
The camera head of element.
Additionally, embodiments of the present invention are in the range of the technical thought shown in claim, it is possible to suitably carry out each
Plant change.
[explanation of symbol]
1 camera head
10 lens
30 shutters
40 imaging apparatuss
50 control portions
80 power circuits (circuit part)
Claims (9)
1. a camera head, it is characterised in that possess:
Imaging apparatus, stores for every line and exports electric charge corresponding with light light quantity；
Lens, make the light from target area in described imaging apparatus imaging；
Shutter, is arranged in side, described target area relative to described imaging apparatus；And
Control portion；And
Described control portion
Described imaging apparatus is controlled, so that during the electric charge storage in each line on described imaging apparatus
Part is overlapped,
AC wave shape based on commercial ac power source detection repeat to light with the luminous source that extinguishes light period,
And during the electric charge of all described lines stores overlapped repeat to store during light period weight with described
In folded period, described shutter is opened.
Camera head the most according to claim 1, it is characterised in that:
Possess the circuit part being supplied to electric power from commercial ac power source,
The AC wave shape of described control portion commercial ac power source based on supply to described circuit part, detects described luminescence
Source light period.
Camera head the most according to claim 2, it is characterised in that:
Described AC wave shape waveform after all wave rectification is exceeded threshold value of lighting set in advance by described control portion
Period be set to described luminous source light period detect.
Camera head the most according to claim 1, it is characterised in that:
Described control portion comprises the region of described luminous source from the image contract imaged by described imaging apparatus, and based on
The brightness in the region extracted, that detects described luminous source lights period.
Camera head the most according to claim 4, it is characterised in that:
Described control portion
Each shooting cycle is repeated following process, i.e. from described repeat store during in specific time sequence
Opening described shutter and the image imaged by described imaging apparatus, extraction comprises the region of described luminous source, and obtains
The brightness in the region extracted,
And open sequential based on what acquired described brightness became described shutter in maximum described shooting cycle,
That detects described luminous source lights period.
Camera head the most according to claim 5, it is characterised in that:
Described control portion cannot comprise described in described luminous source from the image contract imaged by described imaging apparatus
In the case of region, changing the sequential of opening of described shutter, extraction comprises the described region of described luminous source.
7. according to the camera head according to any one of claim 4 to 6, it is characterised in that:
Described control portion repeats the detection lighting period of described luminous source under given conditions and processes, and carries out institute
State and light resetting of period.
Camera head the most according to any one of claim 1 to 7, it is characterised in that:
Described control portion shooting cycle produce the most described repeat to store during with described to light period overlapping
Period in the case of, use described repeat to store during light overlapping one or more periods period with described,
Set described shutter based on shutter speed opens period.
Camera head the most according to any one of claim 1 to 8, it is characterised in that:
Described luminous source is signal lights.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-128032 | 2015-06-25 | ||
| JP2015128032A JP2017011625A (en) | 2015-06-25 | 2015-06-25 | Imaging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106303308A true CN106303308A (en) | 2017-01-04 |
Family
ID=57651316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610373320.0A Withdrawn CN106303308A (en) | 2015-06-25 | 2016-05-31 | Camera head |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2017011625A (en) |
| KR (1) | KR20170001581A (en) |
| CN (1) | CN106303308A (en) |
| TW (1) | TW201703510A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021147995A1 (en) * | 2020-01-23 | 2021-07-29 | 华为技术有限公司 | Control method and apparatus for intelligent vehicle, and related device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3323237A4 (en) * | 2015-08-26 | 2019-07-31 | Zhejiang Dahua Technology Co., Ltd | Methods and systems for traffic monitoring |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002374456A (en) * | 2001-06-14 | 2002-12-26 | Mitsubishi Electric Corp | Terminal with image pickup means |
| CN101567977A (en) * | 2009-06-09 | 2009-10-28 | 北京中星微电子有限公司 | Flicker detection method and device thereof |
| CN102196184A (en) * | 2010-03-12 | 2011-09-21 | 株式会社日立制作所 | Imaging equipment |
| JP2015070422A (en) * | 2013-09-27 | 2015-04-13 | 株式会社ニコン | Imaging apparatus |
-
2015
- 2015-06-25 JP JP2015128032A patent/JP2017011625A/en active Pending
-
2016
- 2016-05-31 CN CN201610373320.0A patent/CN106303308A/en not_active Withdrawn
- 2016-06-02 KR KR1020160068595A patent/KR20170001581A/en unknown
- 2016-06-07 TW TW105118018A patent/TW201703510A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002374456A (en) * | 2001-06-14 | 2002-12-26 | Mitsubishi Electric Corp | Terminal with image pickup means |
| CN101567977A (en) * | 2009-06-09 | 2009-10-28 | 北京中星微电子有限公司 | Flicker detection method and device thereof |
| CN102196184A (en) * | 2010-03-12 | 2011-09-21 | 株式会社日立制作所 | Imaging equipment |
| JP2015070422A (en) * | 2013-09-27 | 2015-04-13 | 株式会社ニコン | Imaging apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021147995A1 (en) * | 2020-01-23 | 2021-07-29 | 华为技术有限公司 | Control method and apparatus for intelligent vehicle, and related device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2017011625A (en) | 2017-01-12 |
| KR20170001581A (en) | 2017-01-04 |
| TW201703510A (en) | 2017-01-16 |
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