CN103391394A - Device and method for improving quality of images captured by electronic police capturing system - Google Patents

Abstract

Disclosed are a device and a method for improving the quality of images captured by an electronic police capturing system. The device comprises a CCD camera of the electronic police capturing system, and the upper portion of a sensor plate of the camera, on which a CCD is installed is backed through a metal gasket, so that an included angle which is an acute angle is formed between the sensor plate on which the CCD is installed and a camera lens. According to the device and the method, the image definition is adjusted on the basis of adjustment of CCD inclination angles, surfaces formed by stop lines and red traffic lights are enabled to be at clear focusing positions, vehicles and red light positions can have clear image information, and the fact that effective law enforcement cannot be performed on illegal acts due to unclear images at red light positions can be avoided. The device and the method are applied to electronic police capturing systems in cities, so that good and clear image effects can be achieved, the intelligent level of cities can be improved, and the traffic safety of the cities can be improved.

Description

A kind of electric police grasp shoot system that improves is captured the device and method of picture quality

Technical field

The present invention relates to the road traffic field, be specifically related to a kind of electric police grasp shoot system that improves and capture the device and method of picture quality.

Background technology

Development along with science and technology, the progress of society, the intelligent city construction is the direction of current urban development, road traffic facility construction as the city macroscopic features more and more comes into one's own, develop convenient, fast, effectively, accurately intelligent transportation system be the development wisdom city an important topic.

In the electric police grasp shoot system, behavior has and captures accurately function to illegal vehicle except the assurance system, the image information of capturing also should have effective Law enforcement capability, namely prove the evidence of vehicle execution illegal activities, accordingly, relevant law enforcement agency could make correct judgement to illegal activities, and punishes accordingly.But, smudgy if the red light position of the image information of capturing occurs, cause and can not judge vehicle by image information and whether implemented illegal activities, law enforcement agency just can not punish the lawbreaker accordingly so.

In the time of the CCD in video camera and camera lens keeping parallelism state, while due to video camera, placing and ground is angled, so the image vehicle location that obtains is clearly, but the position of red light is not clearly, the red light image can cause image can't judge the illegal activities of vehicle not clearly, causes law enforcement to carry out smoothly.How making vehicle location place and red light position all keep clear, is the problem of demanding urgently studying.

Summary of the invention

, for the problem that prior art exists, the invention provides a kind of electric police grasp shoot system that improves and capture the device and method of picture quality.

Technical scheme of the present invention is:

A kind of electric police grasp shoot system that improves is captured the device of picture quality, the ccd video camera that comprises the electric police grasp shoot system, the top of the sensor board of CCD is installed at this video camera adopts metallic gasket to pave, make sensor board and camera lens that CCD is installed form an angle, this angle is acute angle.

Adopt described device to improve the electric police grasp shoot system and capture the method for picture quality, comprise the following steps:

Step 1: between the closest approach that can absorb according to the height h of the F type bar that the electric police grasp shoot system is installed and this F type bar and video camera apart from a, try to achieve video camera to the line of its closest approach that can absorb and this F type α that bar acutangulates, the visual angle that video camera can absorb is 90 °-α, this visual angle

Be the angle that red traffic lights and video camera can absorb angle, the visual angle separated time that arrives

Step 2: calculate F type bar that electric police grasp shoot system be installed and camera lens central point perpendicular to the angle intersection point of stop line between perpendicular to the intersection point A of stop line to the height h of the distance of F type bar and F type bar according to the camera lens central point, and then try to achieve the camera lens central point perpendicular to the intersection point A of stop line and the angle β between the separated time of angle, video camera visual angle;

Step 3: according to the masthead O of F type bar to distance and the angle β of camera lens central point perpendicular to the intersection point A of stop line, calculate the object distance OH of camera lens central point perpendicular to the intersection point A of stop line, some H is the camera lens central point perpendicular to the intersection point A of the stop line intersection point to angle, video camera visual angle separated time;

Step 4: according to the masthead O of F type bar to distance and angle between red traffic lights position B , calculating the object distance OD of red traffic lights position B, some D is the intersection point of red traffic lights position B to angle, video camera visual angle separated time;

Step 5: according to the focal length of object distance OH, object distance OD and video camera, obtain image distance OH ' corresponding to object distance OH and image distance OD ' corresponding to object distance OD by convex lens imaging principle, the camera lens central point is A ' perpendicular to the imaging point that the intersection point A of stop line sees through video camera, and the imaging point that red traffic lights position B sees through video camera is B ';

Step 6:, according to angle β and image distance OH ', try to achieve the camera lens central point and see through the vertical range A ' H ' of the imaging point A ' of video camera to angle, video camera visual angle separated time extended line perpendicular to the intersection point A of stop line, according to angle

With image distance OD ', try to achieve red traffic lights position B and see through the vertical range B ' D ' of the imaging point B ' of video camera to angle, video camera visual angle separated time extended line, obtain H ' D ' according to image distance OH ' and image distance OD ';

Step 7: according to vertical range B ' D ', vertical range A ' H ' and H ' D ' try to achieve acute angle theta between A ' B ' and B ' D ' ', this acute angle theta ' be that the camera lens central point sees through imaging point and the line of the imaging point that red traffic lights position sees through video camera and the angle between camera lens of video camera perpendicular to the intersection point of stop line, the sensor board of CCD and the angle of the required formation of camera lens namely are installed;

Step 8:, according to the angle of the sensor board that CCD is installed and the required formation of camera lens and the length that the sensor board of CCD is installed, try to achieve the height that while making sensor board and camera lens form this angle, sensor board need to pave;

Step 9: metallic gasket is fixed on connecting screw between sensor board upside and camera lens, realizes the height that sensor board need to pave.

Beneficial effect:

The present invention is based on and adjusts CCD angle of inclination (angle of inclination of the sensor board of CCD is installed) and adjust image definition, can make the camera lens central point be in the clear place of focusing perpendicular to the intersection point of stop line and the line of red traffic lights position, guarantee that vehicle and red light have definition equally preferably, by the angle of inclination of adjusting CCD, image definition is proofreaied and correct, can, so that vehicle and red light position all have image information clearly, avoid not fogging clear can't effectively the enforcing the law to illegal activities of causing in red light place.The present invention effectively improves picture quality, and the validity that support vehicles are captured is convenient to carrying out smoothly lawbreaker's law enforcement, be applied to incity, city electric police grasp shoot system, make that it obtains better, image effect clearly, can improve the city intelligent level, improve urban traffic safety.

Description of drawings

Fig. 1 is the simple path situation position in kind simulation drawing of the specific embodiment of the invention;

Fig. 2 is the image of the camera lens of the specific embodiment of the invention;

Fig. 3 is the adjustment CCD angle of inclination figure of the specific embodiment of the invention;

Fig. 4 is the overall flow figure at the adjustment CCD angle of inclination of the specific embodiment of the invention;

Fig. 5 is the apparatus structure schematic diagram that the specific embodiment of the invention improves electric police grasp shoot system candid photograph picture quality;

Fig. 6 is the real road situation location drawing of the specific embodiment of the invention;

Wherein, 1-CCD, 2-sensor board, 3-metallic gasket, 4-camera lens, 5-connecting screw, 6-F type bar, 7-stop line, the red traffic lights position of 8-.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.

as shown in Figure 5, the raising electric police grasp shoot system of present embodiment is captured the device of picture quality, the ccd video camera that comprises the electric police grasp shoot system, the electric police grasp shoot system is arranged on the cross bar of F type bar 6, the top of the sensor board 2 of CCD is installed at this video camera adopts metallic gasket 3 to pave, make the sensor board 2 that CCD1 is installed form an angle with camera lens 4, this angle is acute angle, the real road situation position of present embodiment as shown in Figure 6, this acute angle is that the face of 8 one-tenth of stop line 7 and red traffic lights positions sees through the imaging surface of video camera gained and the angle between camera lens.

In present embodiment, adopt above-mentioned device to improve the electric police grasp shoot system and capture the method for picture quality, as shown in Figure 4, comprise the following steps:

Step 1: between the closest approach that can absorb according to the height h of the F type bar that the electric police grasp shoot system is installed and this F type bar and video camera apart from a, try to achieve video camera to the line of its closest approach that can absorb and this F type α that bar acutangulates, the visual angle that video camera can absorb is 90 °-α, this visual angle

Be the angle that red traffic lights and video camera can absorb angle, the visual angle separated time that arrives

as shown in Figure 1, A is the intersection point of camera lens central point perpendicular to stop line, B is red traffic lights positions, in order to make the camera lens central point have identical definition perpendicular to the intersection point of stop line and the image of red traffic lights position, make A and B on same straight line, E point position is the closest approach that video camera can absorb, E is a=16 rice with the distance of the F type bar OG that the electric police grasp shoot system is installed, the camera lens central point is b=20 rice perpendicular to the intersection point of stop line to the distance of F type bar OG, the camera lens central point is c=50 rice perpendicular to the intersection point of stop line to the distance of red traffic signals lamp stand, the height h=6.5 rice of F type bar OG,

Video camera, to line and this F type α that bar acutangulates of its closest approach E that can absorb, can utilize the arc tangent formula to try to achieve to the distance of F type bar with the height h of F type bar OG by E,

The visual angle that video camera can absorb is 90 °-α, the video camera visual angle

Be designated as

Step 2: calculate F type bar that electric police grasp shoot system be installed and camera lens central point perpendicular to the angle intersection point of stop line between perpendicular to the intersection point A of stop line to the height h of the distance of F type bar and F type bar according to the camera lens central point, and then try to achieve the camera lens central point perpendicular to the intersection point A of stop line and the angle β between the separated time of angle, video camera visual angle;

F type bar and camera lens central point are perpendicular to the formed acute angle of intersection point A of stop line

The camera lens central point perpendicular to the intersection point A of stop line and the angle between the separated time of angle, video camera visual angle is

Step 3: according to the masthead O of F type bar to distance and the angle β of camera lens central point perpendicular to the intersection point A of stop line, calculate the object distance OH of camera lens central point perpendicular to the intersection point A of stop line, some H is the camera lens central point perpendicular to the intersection point A of the stop line intersection point to angle, video camera visual angle separated time;

The masthead O of F type bar and camera lens central point are perpendicular to the line of the intersection point A of stop line

Object distance OH tries to achieve OH=cos β * OA according to following formula;

Step 4: according to the masthead O of F type bar to distance and angle between red traffic lights position B

Calculate the object distance OD of red traffic lights position B, some D is the intersection point of red traffic lights position B to angle, video camera visual angle separated time;

Distance between F type bar OG and red traffic lights position BK is OB=b+c;

Object distance OD tries to achieve according to following formula,

Step 5: according to the focal length of object distance OH, object distance OD and video camera, obtain image distance OH ' corresponding to object distance OH and image distance OD ' corresponding to object distance OD by convex lens imaging principle, the camera lens central point is A ' perpendicular to the imaging point that the intersection point A of stop line sees through video camera, and the imaging point that red traffic lights position B sees through video camera is B ';

In convex lens imaging principle, because there are relation formula in object distance, image distance and focal length three

Wherein, u representative distance, v represents image distance, and f is the focal length of video camera, and as shown in Figure 2, A ' is that the camera lens central point sees through the imaging point of video camera perpendicular to the intersection point A of stop line, and B ' is the imaging point that red traffic lights position B sees through video camera; D ' sees through the imaging point of video camera to the intersection point D of angle, video camera visual angle separated time for B, H ' sees through the imaging point of video camera to the intersection point H of angle, video camera visual angle separated time for A;

Can draw in Fig. 2 corresponding according to Fig. 1

With the position of β, the angle that θ ' should tilt for CCD.Can calculate according to following formula:

$\frac{1}{\mathrm{OH}}+\frac{1}{{\mathrm{OH}}^{\′}}=\frac{1}{f}\⇒{\mathrm{OH}}^{\′}=1/\frac{1}{f}-\frac{1}{\mathrm{OH}},$ $\frac{1}{\mathrm{OD}}+\frac{1}{{\mathrm{OD}}^{\′}}=\frac{1}{f}\⇒{\mathrm{OD}}^{\′}=1/\frac{1}{f}-\frac{1}{\mathrm{OD}}$

Step 6:, according to angle β and image distance OH ', try to achieve the camera lens central point and see through the vertical range A ' H ' of the imaging point A ' of video camera to angle, video camera visual angle separated time extended line perpendicular to the intersection point A of stop line, according to angle

With image distance OD ', try to achieve red traffic lights position B and see through the vertical range B ' D ' of the imaging point B ' of video camera to angle, video camera visual angle separated time extended line, obtain H ' D ' according to image distance OH ' and image distance OD ';

$H^{\′}{D}^{\′}={\mathrm{OH}}^{\′}-{\mathrm{OD}}^{\′}=1/\frac{1}{f}-\frac{1}{\mathrm{OH}}-1/\frac{1}{f}-\frac{1}{\mathrm{OD}}$

A′H′=tanβ×OH′，

Step 7: according to vertical range B ' D ', vertical range A ' H ' and H ' D ' try to achieve acute angle theta between A ' B ' and B ' D ' ', this acute angle theta ' be that the camera lens central point sees through imaging point and the line of the imaging point that red traffic lights position sees through video camera and the angle between camera lens of video camera perpendicular to the intersection point of stop line, the sensor board of CCD and the angle of the required formation of camera lens namely are installed;

$\tan {\mathrm{\θ}}^{\′}=\frac{H^{\′}{D}^{\′}}{A^{\′}{H}^{\′}+B^{\′}{D}^{\′}}\⇒\∠{\mathrm{\θ}}^{\′}=\arctan \frac{H^{\′}{D}^{\′}}{A^{\′}{H}^{\′}+B^{\′}{D}^{\′}};$

Step 8:, according to the angle of the sensor board that CCD is installed and the required formation of camera lens and the length that the sensor board of CCD is installed, try to achieve the height that while making sensor board and camera lens form this angle, sensor board need to pave;

As shown in Figure 3, h _CCD=sin θ ' * L, h _CCDFor the height that sensor board need to pave, L=7cm is for installing the length of ccd sensor plate (sensor plate);

In the situation that the focal distance f of different cameras, the angle of inclination of the required adjustment of CCD (sensor board of CCD and the angle of the required formation of camera lens are installed) result of calculation is as follows:

When f=0.016 rice, θ '=0.0964134501365 °, h _CCD=0.11779119mm;

When f=0.025 rice, θ '=0.1506934187359 °, h _CCD=0.18410653mm;

Step 9: metallic gasket is fixed on connecting screw between sensor board upside and camera lens, realizes the height that sensor board need to pave.

, with the sensor board inclination ∠ θ ' of CCD is installed, be about to the padded h of sensor board _CCDHighly, can reach the effect that improves image definition.

As shown in Figure 5, place the pad of suitable thickness at the place, top position, junction of the sensor board that CCD is installed and camera lens, be about to metallic gasket and be fixed on connecting screw 5 between sensor board upside and camera lens, make the padded h of sensor board that CCD is installed _CCDHighly, with the angle theta that reaches sensor board and the required formation of camera lens '.

Claims (2)

1. one kind is improved the electric police grasp shoot system and captures the device of picture quality, the ccd video camera that comprises the electric police grasp shoot system, it is characterized in that: the top that the sensor board of CCD is installed at this video camera adopts metallic gasket to pave, make sensor board and camera lens that CCD is installed form an angle, this angle is acute angle.

2. adopt device claimed in claim 1 to improve the electric police grasp shoot system and capture the method for picture quality, it is characterized in that: comprise the following steps:

Step 1: between the closest approach that can absorb according to the height h of the F type bar that the electric police grasp shoot system is installed and this F type bar and video camera apart from a, try to achieve video camera to the line of its closest approach that can absorb and this F type α that bar acutangulates, the visual angle that video camera can absorb is 90 °-α, this visual angle

Be the angle that red traffic lights and video camera can absorb angle, the visual angle separated time that arrives

Step 2: calculate F type bar that electric police grasp shoot system be installed and camera lens central point perpendicular to the angle intersection point of stop line between perpendicular to the intersection point A point of stop line to the height h of the distance of F type bar and F type bar according to the camera lens central point, and then try to achieve the camera lens central point perpendicular to the intersection point A of stop line and the angle β between the separated time of angle, video camera visual angle;

Step 3: according to the masthead O of F type bar to distance and the angle β of camera lens central point perpendicular to the intersection point A of stop line, calculate the object distance OH of camera lens central point perpendicular to the intersection point A of stop line, some H is the camera lens central point perpendicular to the intersection point A of the stop line intersection point to angle, video camera visual angle separated time;

Step 4: according to the masthead O of F type bar to distance and angle between red traffic lights position B

Calculate the object distance OD of red traffic lights position B, some D is the intersection point of red traffic lights position B to angle, video camera visual angle separated time;

Step 5: according to the focal length of object distance OH, object distance OD and video camera, obtain image distance OH ' corresponding to object distance OH and image distance OD ' corresponding to object distance OD by convex lens imaging principle, the camera lens central point is A ' perpendicular to the imaging point that the intersection point A of stop line sees through video camera, and the imaging point that red traffic lights position B sees through video camera is B ';

Step 6:, according to angle β and image distance OH ', try to achieve the camera lens central point and see through the vertical range A ' H ' of the imaging point A ' of video camera to angle, video camera visual angle separated time extended line perpendicular to the intersection point A of stop line, according to angle

With image distance OD ', try to achieve red traffic lights position B and see through the vertical range B ' D ' of the imaging point B ' of video camera to angle, video camera visual angle separated time extended line, obtain H ' D ' according to image distance OH ' and image distance OD ';

Step 7: according to vertical range B ' D ', vertical range A ' H ' and H ' D ' try to achieve acute angle theta between A ' B ' and B ' D ' ', this acute angle theta ' be that the camera lens central point sees through imaging point and the line of the imaging point that red traffic lights position sees through video camera and the angle between camera lens of video camera perpendicular to the intersection point of stop line, the sensor board of CCD and the angle of the required formation of camera lens namely are installed;

Step 8:, according to the angle of the sensor board that CCD is installed and the required formation of camera lens and the length that the sensor board of CCD is installed, try to achieve the height that while making sensor board and camera lens form this angle, sensor board need to pave;

Step 9: metallic gasket is fixed on connecting screw between sensor board upside and camera lens, realizes the height that sensor board need to pave.

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