CN104345523A - Method and device for automatically controlling local lighting amount of intelligent traffic camera - Google Patents
Method and device for automatically controlling local lighting amount of intelligent traffic camera Download PDFInfo
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- CN104345523A CN104345523A CN201310338386.2A CN201310338386A CN104345523A CN 104345523 A CN104345523 A CN 104345523A CN 201310338386 A CN201310338386 A CN 201310338386A CN 104345523 A CN104345523 A CN 104345523A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/006—Filter holders
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
- G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/18—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with light-reducing "factor" of filter or other obturator used with or on the lens of the camera
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- Optics & Photonics (AREA)
- Blocking Light For Cameras (AREA)
- Studio Devices (AREA)
Abstract
The invention relates to an intelligent traffic camera, and discloses a method and a device for automatically controlling local lighting amount of the intelligent traffic camera. The intelligent traffic camera comprises a filter set, wherein the filter set comprises a first filter and a second filter; the first filter is located above the second filter; the transmission rate of the first filter is smaller than the transmission rate of the second filter. The method for automatically controlling the local lighting amount of the intelligent traffic camera comprises the following step of when the lighting intensity of the scene of a current video frame is judged to be lower than a threshold value, moving the filter set, so that the first filter and the second filter respectively cover one part of area of the whole scene, and the first filter covers the area where traffic lights are located. The filter set is controlled to move to the appropriate position according to different scene modes, and when other modes are switched to the low-light scene mode, the lighting amount of the traffic light area is limited, and the aim of avoiding overexposure of red lights is achieved, so that the problem that the red lights are a little yellow is avoided.
Description
Technical field
The present invention relates to intelligent transportation video camera, particularly the intelligent transportation video camera local method that automatically controls of light-inletting quantity and device thereof.
Background technology
Along with the sharply increase of countries in the world vehicle fleet size, traffic is subject to people's attention day by day.The social concerns such as traffic jam, traffic hazard, energy-consuming and environmental pollution worsen increasingly, how effectively to carry out traffic administration, more and more become the focus that countries in the world government and relevant department pay close attention to.
Along with the develop rapidly of video technique and being multiplied of the operational speed of a computer, the realization based on the traffic surveillance and control system of computer video detection technique becomes possibility.Existing intelligent transportation video camera in round-the-clock practical application, because whole day 24 hours light the change of divergence is comparatively large, and due to weather, time, season, geographic position, the difference of the factors such as the installation position of camera and angle, also usually causes intensity of illumination, the difference of direction of illumination.And the difference of illumination, larger difference can be formed to the imaging of camera.
Existing intelligent transportation video camera is in round-the-clock practical application, and often following problems may be encountered:
Under low-light level environment, in the traffic lights picture captured, there is partially yellow problem in red light.
Under frontlighting environment, there is vehicle license plate overexposure, and the phenomenon that above picture, scene is too dark.
Under backlight environment, occur that vehicle license plate is excessively dark, and the phenomenon of scene overexposure above picture.
Overexposure is when capture video and photo, and because ambient light is excessively strong, aperture is excessive, shutter to cross in the picture that the reason such as slow causes local or brightness too high, make a kind of phenomenon of video or photo whiting.
Under low-light level environment, existing most of scheme is all the mode adopting red light to learn to write by tracing over characters printed in red, and amber light in output image is retouched into red light.But this kind of disposal route cannot as the foundation of break in traffic rules and regulations punishment.
Under suitable backlight scene, existing scheme is according to detected image and capture the image arrived, computed image characteristic information.According to the image feature information calculated, utilize the technology of backlight compensation, compensate video camera in the defect along shooting picture under backlight environment, ensure that car plate brightness is suitable, and overall scenario is very poor.
Summary of the invention
The method that the object of the present invention is to provide a kind of intelligent transportation video camera local light-inletting quantity automatically to control and device thereof, when ambient brightness changes, control filter set according to different scene modes and move to suitable position, solve in prior art and capture the problem that in picture, red light is partially yellow, and along scene overexposure or vehicle overexposure problem in backlight situation.
For solving the problems of the technologies described above, embodiments of the present invention disclose the method that a kind of intelligent transportation video camera local light-inletting quantity controls automatically, video camera comprises filter set, this filter set comprises the first optical filter and the second optical filter, first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece;
Method comprises the following steps:
When judging the scene brightness of current video frame lower than threshold value, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the first optical filter covers the region at traffic lights place.
Embodiments of the present invention also disclose the method that a kind of intelligent transportation video camera local light-inletting quantity controls automatically, video camera comprises filter set, this filter set comprises the first optical filter and the second optical filter, first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece;
Method comprises the following steps:
When judging that current video frame is backlight scene mode, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the second optical filter covers the region at vehicle place.
Embodiments of the present invention also disclose the method that a kind of intelligent transportation video camera local light-inletting quantity controls automatically, video camera comprises filter set, this filter set comprises the second optical filter and the 3rd optical filter, second optical filter is positioned at the top of the 3rd optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second optical filter;
Method comprises the following steps:
When judging that current video frame is frontlighting scene mode, mobile spectral filter group, makes the second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
Embodiments of the present invention also disclose the device that a kind of intelligent transportation video camera local light-inletting quantity controls automatically, comprising:
Filter set, this filter set comprises the first optical filter and the second optical filter, and the first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece;
Judging unit, for judging the scene mode of current video frame;
Low-light level control module, during for judging the scene brightness of current video frame lower than threshold value when judging unit, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the first optical filter covers the region at traffic lights place.
Embodiments of the present invention also disclose the device that a kind of intelligent transportation video camera local light-inletting quantity controls automatically, comprising:
Filter set, this filter set comprises the first optical filter and the second optical filter, and the first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece;
Judging unit, for judging the scene mode of current video frame;
Backlight control module, during for judging that current video frame is backlight scene mode when judging unit, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the second optical filter covers the region at vehicle place.
Embodiments of the present invention also disclose the device that a kind of intelligent transportation video camera local light-inletting quantity controls automatically, comprising:
Filter set, this filter set comprises the second optical filter and the 3rd optical filter, and the second optical filter is positioned at the top of the 3rd optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second optical filter;
Judging unit, for judging the scene mode of current video frame;
Frontlighting control module, during for judging that current video frame is frontlighting scene mode when judging unit, mobile spectral filter group, makes the second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
Compared with prior art, the key distinction and effect thereof are embodiment of the present invention:
When being switched to low-brightness scene pattern by other patterns, controlling filter set and moving to suitable position, limiting the light-inletting quantity in traffic lights region, reaching the object of red light not overexposure, thus avoid the partially yellow problem of red light, reach normal traffic lights effect.
When being switched to backlight scene mode by other patterns, controlling filter set and moving to suitable position, thus avoiding scene overexposure above backlight situation hypograph, the problem that below vehicle is too dark occurs.
When being switched to frontlighting scene mode by other patterns, controlling filter set and moving to suitable position, thus it is too dark to avoid scene above frontlighting situation hypograph, the problem of below vehicle license plate overexposure occurs.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method that in first embodiment of the invention, a kind of intelligent transportation video camera local light-inletting quantity controls automatically;
Fig. 2 is the schematic diagram of a kind of filter set in first embodiment of the invention;
Fig. 3 is the schematic diagram of a kind of filter set in first embodiment of the invention;
Fig. 4 is the schematic diagram of reflected light imaging when a kind of two optical filters are glued together in first embodiment of the invention;
Fig. 5 is the schematic flow sheet of the method that in first embodiment of the invention, a kind of intelligent transportation video camera local light-inletting quantity controls automatically;
Fig. 6 is the schematic flow sheet of the method that in second embodiment of the invention, a kind of intelligent transportation video camera local light-inletting quantity controls automatically;
Fig. 7 is the schematic flow sheet of the method that in third embodiment of the invention, a kind of intelligent transportation video camera local light-inletting quantity controls automatically;
Fig. 8 is the structural representation of the device that in four embodiment of the invention, a kind of intelligent transportation video camera local light-inletting quantity controls automatically;
Fig. 9 is the structural representation of the device that in four embodiment of the invention preference, a kind of intelligent transportation video camera local light-inletting quantity controls automatically;
Figure 10 is that in four embodiment of the invention, a kind of filter set is that the local light-inletting quantity that filter set that upper and lower two panels transmitance is different is combined controls schematic diagram;
Figure 11 is the structural representation of the device that in fifth embodiment of the invention, a kind of intelligent transportation video camera local light-inletting quantity controls automatically;
Figure 12 is the structural representation of the device that in sixth embodiment of the invention, a kind of intelligent transportation video camera local light-inletting quantity controls automatically;
Figure 13 is that in sixth embodiment of the invention, a kind of filter set is that the local light-inletting quantity that filter set that upper, middle and lower three transmitances are different is combined controls schematic diagram.
Embodiment
In the following description, many ins and outs are proposed in order to make reader understand the application better.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations of following embodiment and amendment, also can realize each claim of the application technical scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to the method that a kind of intelligent transportation video camera local light-inletting quantity controls automatically.Fig. 1 is the schematic flow sheet of the method that this intelligent transportation video camera local light-inletting quantity controls automatically.
This intelligent transportation video camera comprises filter set, and this filter set comprises the first optical filter and the second optical filter, and the first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece, as shown in Figure 2 a.
It should be noted that, in the present embodiment, preferably, filter set is integral type, is the filter set that multiple optical filters combines formation, and reality is whole piece optical filter, just be divided into multiple parts that transmitance is different, as the first optical filter, the second optical filter or the 3rd optical filter.
Filter set is a slice of integral type, is divided into multiple part by transmitance: up and down or upper, middle and lower.
Need to further illustrate, be for the relative height on ground below top alleged in present embodiment, top is direction overhead far away, and below is overhead nearer direction.
Specifically, as shown in Figure 1, the method comprises the following steps:
In a step 101, the scene mode of current video frame is analyzed.
Scene mode comprises: frontlighting scene, backlight scene, normal scene and low-brightness scene.
After this enter step 102, judge that whether the scene brightness of current video frame is lower than threshold value.
In this step, scene brightness has multiple determination methods lower than threshold value, typical case be mean flow rate lower than threshold value, also can be that the brightness of the regional area of specifying is lower than threshold value under special scenes, or after the computing that whole scene is specified, then judge that whether brightness is lower than threshold value.
During lower than threshold value, enter step 103, mobile spectral filter group, make the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the first optical filter covers the region at traffic lights place.
After this process ends.
Optical filter is the one of optical element, for attenuate light intensity, changes incident light spectral component, frequecy characteristic or polarization characteristic.Be widely used on the optoelectronic devices such as video camera.
The filter set schematic diagram that Fig. 2 provides for the embodiment of the present invention, in the present invention, optical filter can be multiple combination mode, according to different production technologies, can realize multiple combination:
A. the filter set that two panels transmitance is different is up and down combined into a slice, or the optical filter that two panels transmitance is different separately, wherein: transmitance x< transmitance y;
B. the filter set that two panels transmitance in left and right is different is combined into a slice, or the optical filter that two panels transmitance is different separately, wherein, and transmitance x< transmitance y.
It should be noted that, top-priority is at present optical filter array mode, is made up of ND glass and coated glass, and the mode of independent two panels can be considered to do Fuzzy Processing.
In addition, be appreciated that filter set has multiple different array mode in some other embodiment of the present invention, according to different production technologies, can multiple combination be realized, not as limit.
Further, preferably, light-inletting quantity method of automatically controlling in this intelligent transportation video camera local is further comprising the steps of:
When judging that current video frame is backlight scene mode, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the second optical filter covers the region at vehicle place.
Further, preferably, this filter set also comprises the 3rd optical filter, and the 3rd optical filter is positioned at the below of the second optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second optical filter.
It should be noted that, in the present embodiment, preferably, filter set is integral type, is the filter set that multiple optical filters combines formation, and reality is whole piece optical filter, just be divided into multiple parts that transmitance is different, as the first optical filter, the second optical filter or the 3rd optical filter.
Filter set is a slice of integral type, is divided into multiple part by transmitance: up and down or upper, middle and lower.
The filter set schematic diagram that Fig. 3 provides for the embodiment of the present invention, in the present invention, optical filter can be multiple combination mode, according to different production technologies, can realize multiple combination:
A. the filter set that upper, middle and lower three transmitances are different is combined into a slice, or the optical filter that independent three transmitances are different, wherein: transmitance x< transmitance y; Transmitance z< transmitance y;
B. the filter set that three, left, center, right transmitance is different is combined into a slice, or the optical filter that independent three transmitances are different, wherein: transmitance x< transmitance y; Transmitance z< transmitance y.
Similarly, it should be noted that, top-priority is at present optical filter array mode, is made up of ND glass and coated glass, and the mode of independent two panels can be considered to do Fuzzy Processing.
In the present embodiment, preferably, the first optical filter is ND glass, and the second optical filter is white glass, and the 3rd optical filter is ND glass.
Preferably, the thickness of ND glass is 0.5 to 1.5 millimeter, and optimum thickness is in 1 millimeter; Transmitance is between 1% to 4%, and optimum transmission is about 2.5%.
In the present embodiment, preferably, first, second, and third optical filter is glued together by optical cement.Each cemented surface is all an angle with the surface of light incidence, and the angular range of this angle is between 30 to 60 degree.
In addition, be appreciated that cemented surface also can not tilt, but vertical with the surface of light incidence in some other embodiment of the present invention.
Wherein, ND glass refers to neutral gray scale glass, and be called for short neutral density or ND glass, this glass can in the scope of wider wavelength, the decay of homogenous proportion carried out to incident light and does not change the color of light, being widely used in the photography or the industry shooting occasion that prevent overexposure.
Below, for white glass and ND glass two optical filters glued together, a kind of structure and characteristics of preferred filter set is described.
Particularly, as shown in Figure 4, in fig .4, the cemented surface of white glass and ND glass two optical filters is vertical with the surface of light incidence; In fig. 4b, the cemented surface of white glass and ND glass two optical filters and the surface of light incidence are an angle, and the angular range of this angle is between 5 to 60 degree.
As shown in fig. 4 a, when cementing layer does not tilt, extraneous light is when inciding on white glass, interface between cementing layer and ND glass, because of the change of different materials refractive index, reflected light can be formed on these interfaces, if reflected light is fallen on sensor (Sensor), then form ghost image.Ghost image can have a strong impact on the picture quality of video camera.In order to alleviate boundary reflection, need careful selection ND glass and the material of optical cement, what their refractive index and white glass were tried one's best is close.Such as, even if but through such process, enough strong at external light source, when having automobile lamp direct projection camera, the impact of ghost image is still very large, and picture effect is still undesirable.
As shown in fig 4b, white glass and ND glass are all made pitch angle and glued together, even if cemented surface has reflected light like this, but because there is certain inclination angle in this face, from reflection theorem, reflected light can shine the region outside sensor, as thus obvious impact can not be caused on image.In addition, owing to there is pitch angle, when a series of light be arranged above and below is successively from left to right by optical filter, the distance that they propagate in ND glass can increase gradually, also strengthens gradually the attenuating of light, thus forms the effect of the Graduated Filter.
Preferably, light-inletting quantity method of automatically controlling in this intelligent transportation video camera local is further comprising the steps of:
When judging that current video frame is frontlighting scene mode, mobile spectral filter group, makes the second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
In addition, be appreciated that the region covering car plate place refers to the position covering car plate and usually there will be.
As a preferred embodiment of the present invention, Fig. 5 is the schematic flow sheet of video camera local light-inletting quantity control method in the present invention, and light-inletting quantity control realization step comprises:
1. pair frame of video is analyzed, and judges which kind of scene mode current live environment is in, and scene mode comprises: frontlighting scene, backlight scene, normal scene, low-brightness scene;
2. obtain the scene mode of present frame;
3., when the scene mode of present frame changes, control the movement of filter set;
4. detect the position of current filter set in real time;
5., after filter set reaches precalculated position, stop the movement of filter set; Otherwise, mobile spectral filter group will be continued.
When being switched to low-brightness scene pattern by other patterns, controlling optical filter combination and moving to suitable position, limiting the light-inletting quantity in traffic lights region, reach the object of red light not overexposure, thus avoiding the partially yellow problem of red light, reaching normal traffic lights effect.
When being switched to backlight scene mode by other patterns, control optical filter combination and move to suitable position, thus avoid scene overexposure above backlight situation hypograph, the problem that below vehicle is too dark occurs.
When being switched to frontlighting scene mode by other patterns, controlling optical filter combination and moving to suitable position, thus it is too dark to avoid scene above frontlighting situation hypograph, the problem of below vehicle license plate overexposure occurs.
Second embodiment of the invention relates to the method that a kind of intelligent transportation video camera local light-inletting quantity controls automatically.Fig. 6 is the schematic flow sheet of the method that this intelligent transportation video camera local light-inletting quantity controls automatically.
This intelligent transportation video camera comprises filter set, and this filter set comprises the first optical filter and the second optical filter, and the first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece.
Specifically, as shown in Figure 6, the method comprises the following steps:
In step 601, the scene mode of current video frame is analyzed.
Scene mode comprises: frontlighting scene, backlight scene, normal scene and low-brightness scene.
After this enter step 602, judge whether current video frame is backlight scene mode.
If so, then enter step 603, mobile spectral filter group, make the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the second optical filter covers the region at vehicle place.
After this process ends.
When judging that current video frame is backlight scene mode, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the second optical filter covers the region at vehicle place.
When being switched to backlight scene mode by other patterns, control optical filter combination and move to suitable position, thus avoid scene overexposure above backlight situation hypograph, the problem that below vehicle is too dark occurs.
Third embodiment of the invention relates to the method that a kind of intelligent transportation video camera local light-inletting quantity controls automatically.Fig. 7 is the schematic flow sheet of the method that this intelligent transportation video camera local light-inletting quantity controls automatically.
The method video camera that this intelligent transportation video camera local light-inletting quantity controls automatically comprises filter set, this filter set comprises the second optical filter and the 3rd optical filter, second optical filter is positioned at the top of the 3rd optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second light transmission piece.
Specifically, as shown in Figure 7, the method comprises the following steps:
In step 701, analyze the scene mode of current video frame.
Scene mode comprises: frontlighting scene, backlight scene, normal scene and low-brightness scene.
After this enter step 702, judge whether current video frame is frontlighting scene mode.
If so, then enter step 703, mobile spectral filter group, make the second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
After this process ends.
When judging that current video frame is frontlighting scene mode, mobile spectral filter group, makes the second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
When being switched to frontlighting scene mode by other patterns, controlling optical filter combination and moving to suitable position, thus it is too dark to avoid scene above frontlighting situation hypograph, the problem of below vehicle license plate overexposure occurs.
Each method embodiment of the present invention all can realize in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the addressable storer of computing machine of any type (such as permanent or revisable, volatibility or non-volatile, solid-state or non-solid, fixing or removable medium etc.).Equally, storer can be such as programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), ROM (read-only memory) (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.
Four embodiment of the invention relates to the device that a kind of intelligent transportation video camera local light-inletting quantity controls automatically.Fig. 8 is the structural representation of the device that this intelligent transportation video camera local light-inletting quantity controls automatically.
Specifically, as shown in Figure 8, the device that this intelligent transportation video camera local light-inletting quantity controls automatically comprises:
Filter set, this filter set comprises the first optical filter and the second optical filter, and the first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece.
It should be noted that, in the present embodiment, preferably, filter set is integral type, is the filter set that multiple optical filters combines formation, and reality is whole piece optical filter, just be divided into multiple parts that transmitance is different, as the first optical filter, the second optical filter or the 3rd optical filter.
Filter set is a slice of integral type, is divided into multiple part by transmitance: up and down or upper, middle and lower.
Judging unit, for judging the scene mode of current video frame.
Low-light level control module, during for judging the scene brightness of current video frame lower than threshold value when judging unit, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the first optical filter covers the region at traffic lights place.
Preferably, the device that this intelligent transportation video camera local light-inletting quantity controls automatically also comprises:
Backlight control module, during for judging that current video frame is backlight scene mode when judging unit, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the second optical filter covers the region at vehicle place.
Further, preferably, filter set also comprises the 3rd optical filter, and the 3rd optical filter is positioned at the below of the second optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second optical filter.
Preferably, the device that this intelligent transportation video camera local light-inletting quantity controls automatically also comprises:
Frontlighting control module, during for judging that current video frame is frontlighting scene mode when judging unit, mobile spectral filter group, makes the second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
As a preference of the present invention, the device that this intelligent transportation video camera local light-inletting quantity controls automatically as shown in Figure 9, comprising:
Filter set, enters the light-inletting quantity in camera optics sensor for controlling.
Filter set provides one or more groups optical filter, for controlling through optical filter, enters the light-inletting quantity of optical sensor; Optical filter combines according to light-inletting quantity size, has 100% transmitance and a certain proportion of transmitance.
Optical sensor, for light signal is converted to electric signal, and finally obtains vision signal.
Optical sensor is requisite device in video camera, by light signal is converted to electric signal, and finally obtains vision signal.
Image processing module, requisite unit in video camera, carries out calculation process for the vision signal sent by optical sensor, analyzes the scene mode of frame of video.
Position detecting module, for detecting the position of filter set in real time.
Transmission module, for driving filter set, makes filter set move to assigned address together along with transmission module.
Adopt stepper motor to carry out transmission to filter set in this preference, in other embodiments of the present invention, also can adopt other transmission modules, do not affect enforcement of the present invention.
Control module, for obtaining the scene mode of present frame from image processing module, detects position detecting module in real time, and moves to precalculated position by transmission module control filter set.Control module, according to the information calculated in image processing module, detects the positional information in position detecting module, by carrying out analyzing and processing to operation result, thus controls transmission module, and finally realize the accurate switching of filter set.
In this preference, video camera local light-inletting quantity autocontrol method mainly completes in described control module, and specifically, control module comprises following submodule:
Scene detection submodule, for when ambient brightness changes, according to the analysis of image processing module to current frame image, judges which kind of scene mode current live environment is in.
Optical filter switches control submodule, for completing the control to transmission module and the detection to position detecting module, realizes filter set to move to precalculated position like clockwork.
In this preference, video camera completes following work:
1. light enters optical sensor by filter set;
2. optical sensor utilizes opto-electronic conversion, and the video signal after conversion is sent to image processing module;
3. image processing module can the shutter of control both optical sensor and gain, can analyze current video frame simultaneously, judge which kind of scene mode current live environment is in, and scene mode comprises: frontlighting scene, backlight scene, normal scene, low-brightness scene;
4. control module obtains the scene mode of present frame from image processing module, detects position detecting module in real time, and the final transmission module that controls carries out blocked operation to optical filter.
The local light-inletting quantity of this preference controls schematic diagram as shown in Figure 10, and in the present invention, local light-inletting quantity has controlled following work:
Filter set shown in Figure 10 is that the filter set that upper and lower two panels transmitance is different is combined, wherein: transmitance x< transmitance y
1. image processing module is analyzed present frame, judges the scene mode drawing current live environment;
2. image processing module is by operational analysis, draws the scene mode of current live environment, then notifies that optical filter switches and controls submodule current scene pattern;
3. optical filter switches control submodule acquisition current live environmental pattern, when being switched to low-brightness scene pattern by other patterns, optical filter switches control submodule and will start, control optical filter combination and move to precalculated position, the light-inletting quantity of optical sensor upper area (in diagram region A) light-inletting quantity comparatively lower zone (in diagram region B) will be lacked, limit the light-inletting quantity in red light region, reach the object of red light not overexposure, thus avoid the partially yellow problem of red light, reach normal red light effect;
4. optical filter switches control submodule acquisition current live environmental pattern, when being switched to backlight scene mode by other patterns, optical filter switches control submodule and will start, control optical filter combination and move to precalculated position, the light-inletting quantity of optical sensor upper area (in diagram region A) light-inletting quantity comparatively lower zone (in diagram region B) will be lacked, limit the light-inletting quantity of image upper area (in diagram region A), thus avoiding scene overexposure above backlight situation hypograph, the problem that below vehicle is too dark occurs.
It should be noted that, in the present embodiment, preferably, filter set is integral type, is the filter set that multiple optical filters combines formation, and reality is whole piece optical filter, just be divided into multiple parts that transmitance is different, as the first optical filter, the second optical filter or the 3rd optical filter.
Filter set is a slice of integral type, is divided into multiple part by transmitance: up and down or upper, middle and lower.
When ambient brightness changes, carry out the position blocked operation of filter set according to different scene modes, solve in prior art and capture the partially yellow problem of red light in picture, and the problem of scene overexposure in backlight situation.
When being switched to low-brightness scene pattern by other patterns, limiting the light-inletting quantity in red light region, reaching the object of red light not overexposure, thus avoid the partially yellow problem of red light, reach normal red light effect.
When being switched to backlight scene mode by other patterns, control optical filter combination and move to precalculated position, thus avoid scene overexposure above backlight situation hypograph, the problem that below vehicle is too dark occurs.
First embodiment is the method embodiment corresponding with present embodiment, and present embodiment can be worked in coordination with the first embodiment and be implemented.The relevant technical details mentioned in first embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first embodiment.
Fifth embodiment of the invention relates to the device that a kind of intelligent transportation video camera local light-inletting quantity controls automatically.Figure 11 is the structural representation of the device that this intelligent transportation video camera local light-inletting quantity controls automatically.
Specifically, as shown in figure 11, the device that this intelligent transportation video camera local light-inletting quantity controls automatically comprises:
Filter set, this filter set comprises the first optical filter and the second optical filter, and the first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece.
It should be noted that, in the present embodiment, preferably, filter set is integral type, is the filter set that multiple optical filters combines formation, and reality is whole piece optical filter, just be divided into multiple parts that transmitance is different, as the first optical filter, the second optical filter or the 3rd optical filter.
Filter set is a slice of integral type, is divided into multiple part by transmitance: up and down or upper, middle and lower.
Judging unit, for judging the scene mode of current video frame.
Backlight control module, during for judging that current video frame is backlight scene mode when judging unit, mobile spectral filter group, makes the first optical filter and the second optical filter respectively cover a part of region of whole scene, and the second optical filter covers the region at vehicle place.
Second embodiment is the method embodiment corresponding with present embodiment, and present embodiment can be worked in coordination with the second embodiment and be implemented.The relevant technical details mentioned in second embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the second embodiment.
Sixth embodiment of the invention relates to the device that a kind of intelligent transportation video camera local light-inletting quantity controls automatically.Figure 12 is the structural representation of the device that this intelligent transportation video camera local light-inletting quantity controls automatically.
Specifically, as shown in figure 12, the device that this intelligent transportation video camera local light-inletting quantity controls automatically comprises:
Filter set, this filter set comprises the second optical filter and the 3rd optical filter, and the second optical filter is positioned at the top of the 3rd optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second light transmission piece.
Judging unit, for judging the scene mode of current video frame.
Frontlighting control module, during for judging that when judging unit current video frame is frontlighting light scene mode, mobile spectral filter group, makes the second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
As a preference of the present invention, Figure 13 is that local light-inletting quantity controls schematic diagram, and in the present invention, local light-inletting quantity has controlled following work:
Filter set shown in Figure 13 is that the filter set that upper, middle and lower three transmitances are different is combined, wherein: transmitance x< transmitance y; Transmitance z< transmitance y;
1. image processing module is analyzed present frame, judges the scene mode drawing current live environment;
2. image processing module is by operational analysis, draws the scene mode of current live environment, then notifies that optical filter switches and controls submodule current scene pattern;
3. optical filter switches control submodule acquisition current live environmental pattern, when being switched to low-brightness scene pattern by other patterns, optical filter switches control submodule and will start, control optical filter combination and move to precalculated position, the light-inletting quantity of optical sensor upper area (in diagram region A) light-inletting quantity comparatively lower zone (in diagram region B) will be lacked, limit the light-inletting quantity in red light region, reach the object of red light not overexposure, thus avoid the partially yellow problem of red light, reach normal red light effect;
4. optical filter switches control submodule acquisition current live environmental pattern, when being switched to backlight scene mode by other patterns, optical filter switches control submodule and will start, control optical filter combination and move to precalculated position, the light-inletting quantity of optical sensor upper area (in diagram region A) light-inletting quantity comparatively lower zone (in diagram region B) will be lacked, limit the light-inletting quantity of image upper area (in diagram region A), thus avoiding scene overexposure above backlight situation hypograph, the problem that below vehicle is too dark occurs;
5. optical filter switches control submodule acquisition current live environmental pattern, when being switched to frontlighting scene mode by other patterns, optical filter switches control submodule and will start, control optical filter combination and move to precalculated position, the light-inletting quantity of optical sensor lower zone (in diagram region D) light-inletting quantity comparatively upper area (in diagram region C) will be lacked, limit the light-inletting quantity of image lower zone (in diagram region D), thus it is too dark to avoid scene above frontlighting situation hypograph, the problem of below vehicle license plate overexposure occurs.
It should be noted that, in the present embodiment, preferably, filter set is integral type, is the filter set that multiple optical filters combines formation, and reality is whole piece optical filter, just be divided into multiple parts that transmitance is different, as the first optical filter, the second optical filter or the 3rd optical filter.
Filter set is a slice of integral type, is divided into multiple part by transmitance: up and down or upper, middle and lower.
3rd embodiment is the method embodiment corresponding with present embodiment, and present embodiment can be worked in coordination with the 3rd embodiment and be implemented.The relevant technical details mentioned in 3rd embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the 3rd embodiment.
The invention provides the apparatus and method that a kind of intelligent transportation video camera local light-inletting quantity controls automatically, capture to solve in prior art the problem that in picture, red light is partially yellow, and along scene overexposure or vehicle overexposure problem in backlight situation.
The present invention efficiently solves the problem that red light is partially yellow under low-light level environment, and break in traffic rules and regulations process provides effective punishing justification; Simultaneously under severe suitable backlight scene, ensure that the effect of car plate and overall scenario.
It should be noted that, in the claim and instructions of this patent, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element " being comprised " limited by statement, and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Although by referring to some of the preferred embodiment of the invention, to invention has been diagram and describing, but those of ordinary skill in the art should be understood that and can do various change to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (11)
1. the method that automatically controls of intelligent transportation video camera local light-inletting quantity, it is characterized in that, described video camera comprises filter set, this filter set comprises the first optical filter and the second optical filter, first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece;
Said method comprising the steps of:
When judging the scene brightness of current video frame lower than threshold value, mobile described filter set, makes described first optical filter and the second optical filter respectively cover a part of region of whole scene, and described first optical filter covers the region at traffic lights place.
2. the method that automatically controls of intelligent transportation video camera according to claim 1 local light-inletting quantity, is characterized in that, further comprising the steps of:
When judging that current video frame is backlight scene mode, mobile described filter set, makes described first optical filter and the second optical filter respectively cover a part of region of whole scene, and described second optical filter covers the region at vehicle place.
3. the method that automatically controls of intelligent transportation video camera according to claim 1 and 2 local light-inletting quantity, it is characterized in that, described filter set also comprises the 3rd optical filter, and the 3rd optical filter is positioned at the below of the second optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second optical filter;
Described method is further comprising the steps of:
When judging that current video frame is frontlighting scene mode, mobile described filter set, makes described second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
4. the method that automatically controls of intelligent transportation video camera according to claim 3 local light-inletting quantity, it is characterized in that, described first, second, and third optical filter is glued together by optical cement, each cemented surface is all an angle with the surface of light incidence, and the angular range of this angle is between 5 to 60 degree.
5. the method that automatically controls of intelligent transportation video camera local light-inletting quantity, it is characterized in that, described video camera comprises filter set, this filter set comprises the first optical filter and the second optical filter, first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece;
Said method comprising the steps of:
When judging that current video frame is backlight scene mode, mobile described filter set, makes described first optical filter and the second optical filter respectively cover a part of region of whole scene, and described second optical filter covers the region at vehicle place.
6. the method that automatically controls of intelligent transportation video camera local light-inletting quantity, it is characterized in that, described video camera comprises filter set, this filter set comprises the second optical filter and the 3rd optical filter, second optical filter is positioned at the top of the 3rd optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second optical filter;
Said method comprising the steps of:
When judging that current video frame is frontlighting scene mode, mobile described filter set, makes described second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and the 3rd optical filter covers the region at car plate place.
7. the intelligent transportation video camera local device that automatically controls of light-inletting quantity, is characterized in that, comprising:
Filter set, this filter set comprises the first optical filter and the second optical filter, and the first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece;
Judging unit, for judging the scene mode of current video frame;
Low-light level control module, for when described judging unit judges the scene brightness of current video frame lower than threshold value, mobile described filter set, makes described first optical filter and the second optical filter respectively cover a part of region of whole scene, and described first optical filter covers the region at traffic lights place.
8. the device that automatically controls of intelligent transportation video camera according to claim 7 local light-inletting quantity, is characterized in that, also comprise:
Backlight control module, for when described judging unit judges that current video frame is backlight scene mode, mobile described filter set, makes described first optical filter and the second optical filter respectively cover a part of region of whole scene, and described second optical filter covers the region at vehicle place.
9. the device that the intelligent transportation video camera local light-inletting quantity according to claim 7 or 8 controls automatically, it is characterized in that, described filter set also comprises the 3rd optical filter, and the 3rd optical filter is positioned at the below of the second optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second optical filter;
Also comprise:
Frontlighting control module, for when described judging unit judges that current video frame is frontlighting scene mode, mobile described filter set, makes described second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and described 3rd optical filter covers the region at car plate place.
10. the intelligent transportation video camera local device that automatically controls of light-inletting quantity, is characterized in that, comprising:
Filter set, this filter set comprises the first optical filter and the second optical filter, and the first optical filter is positioned at the top of the second optical filter, and the transmitance of the first optical filter is less than the transmitance of the second light transmission piece;
Judging unit, for judging the scene mode of current video frame;
Backlight control module, for when described judging unit judges that current video frame is backlight scene mode, mobile described filter set, makes described first optical filter and the second optical filter respectively cover a part of region of whole scene, and described second optical filter covers the region at vehicle place.
The device that 11. 1 kinds of intelligent transportation video camera local light-inletting quantities control automatically, is characterized in that, comprising:
Filter set, this filter set comprises the second optical filter and the 3rd optical filter, and the second optical filter is positioned at the top of the 3rd optical filter, and the transmitance of the 3rd optical filter is less than the transmitance of the second optical filter;
Judging unit, for judging the scene mode of current video frame;
Frontlighting control module, for when described judging unit judges that current video frame is frontlighting scene mode, mobile described filter set, makes described second optical filter and the 3rd optical filter respectively cover a part of region of whole scene, and described 3rd optical filter covers the region at car plate place.
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