KR101554169B1 - Camera assembly for recognizing a license number of vehicle - Google Patents

Camera assembly for recognizing a license number of vehicle Download PDF

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Publication number
KR101554169B1
KR101554169B1 KR1020150094541A KR20150094541A KR101554169B1 KR 101554169 B1 KR101554169 B1 KR 101554169B1 KR 1020150094541 A KR1020150094541 A KR 1020150094541A KR 20150094541 A KR20150094541 A KR 20150094541A KR 101554169 B1 KR101554169 B1 KR 101554169B1
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KR
South Korea
Prior art keywords
camera
camera module
infrared
photographing
module
Prior art date
Application number
KR1020150094541A
Other languages
Korean (ko)
Inventor
이소영
이창호
장기진
Original Assignee
(주)지피아이코리아
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Priority to KR1020150094541A priority Critical patent/KR101554169B1/en
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Publication of KR101554169B1 publication Critical patent/KR101554169B1/en

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
    • 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
    • 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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/04—Combinations of cameras with non-electronic flash apparatus; Non-electronic flash units
    • G03B15/0405—Non-electronic flash apparatus incorporated in photographic apparatus
    • 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
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • G03B2215/0564—Combinations of cameras with electronic flash units characterised by the type of light source
    • G03B2215/0567—Solid-state light source, e.g. LED, laser

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)

Abstract

The present invention relates to a camera assembly for vehicle identification, and more particularly, to a camera assembly for vehicle identification, which comprises a first camera module for photographing a license plate, a second camera module for a whole vehicle and a surrounding camera, And a control board for controlling the operation of the first and second camera modules and the infrared LED group. Therefore, it is possible to accurately recognize the vehicle number in the daytime as well as in the nighttime, The present invention relates to a camera assembly for recognizing a car number capable of securing image information on the environment and further capable of maintaining excellent weatherability and moisture resistance even under severe weather conditions.

Description

Technical Field [0001] The present invention relates to a camera assembly for recognizing a license number,

The present invention relates to a camera assembly for vehicle identification, and more particularly, to a camera assembly for vehicle identification, which comprises a first camera module for photographing a license plate, a second camera module for a whole vehicle and a surrounding camera, And a control board for controlling the operation of the first and second camera modules and the infrared LED group. Therefore, it is possible to accurately recognize the vehicle number in the daytime as well as in the nighttime, The present invention relates to a camera assembly for recognizing a car number capable of securing image information on the environment and further capable of maintaining excellent weatherability and moisture resistance even under severe weather conditions.

In recent years, a camera has been developed and used to automatically recognize the vehicle number of a car in order to increase the quantity of the car explosively, to inquire about a pick-up vehicle, to perform an illegal parking enforcement or parking management more efficiently.

Such a car number recognition camera captures a car license plate with a high resolution camera, for example, and transmits the image to a PC or dedicated hardware through a capture board. Then, the outside of the car license plate, characters and numbers are analyzed It is operated as a system to extract the car number of the vehicle.

For reference, Japanese Patent No. 10-1151523 (May 23, 2012), Patent No. 10-0852683 (Aug. 11, 2008), Patent No. 10-0716260 (May 02, 2007) 10-2008-0076353 (Aug. 20, 2008) discloses various vehicle identification systems. As disclosed in these patents, the use of a camera for recognizing a car number enables automatic, fast, accurate recognition, storage and retrieval of a car number of a large number of cars. Thus, for example, Or to control illegal parking.

Conventionally, when a car number recognition camera is installed in a police patrol car, for example, infrared light (IR) is installed outside a patrol car, and a high resolution black and white camera is installed inside the car to extract license plate images.

However, in this structure, since the black-and-white camera and the infrared light are separated from each other, it is difficult to match the angle and the distance with each other in the case of performing night work, and since only the license plate is photographed, There is a limit in that information about the surrounding environment can not be secured.

Patent No. 10-1151523 (May 23, 2012) Patent No. 10-0852683 (Aug. 11, 2008) Patent No. 10-0716260 (May 02, 2007) Open Patent No. 10-2008-0076353 (Aug. 20, 2008)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an information processing apparatus and method that can acquire image information of a vehicle license plate together with image information of an entire vehicle and its surrounding environment together with the vehicle license plate, And to provide a camera assembly for recognizing a car number that is easily detachable or adjustable in focus and distance.

On the other hand, since the car number recognition camera is usually operated outdoors, it is necessary to provide weather resistance and moisture resistance against changes in climate and temperature. Accordingly, another object of the present invention is to provide a camera assembly for vehicle number recognition, which is excellent in weatherability and moisture resistance against changes in climate and temperature.

A camera assembly for recognizing a car number according to the present invention comprises: a camera housing having a closed structure and having camera support rails arranged on both sides in a front and rear direction; A first camera module which is reversibly fixed to one of the camera support rails and is equipped with an IR pass filter and photographs a license plate; A second camera module that is reversibly fixed to the other of the camera support rails and captures the entire vehicle and its surroundings; An infrared LED group installed in front of the camera housing for irradiating infrared rays of a specific region toward a subject; A control board for controlling operations of the first and second camera modules and the infrared LED group; And a control unit.

In addition, the camera assembly is filled with nitrogen gas inside the camera housing, and an air valve for filling a nitrogen gas is installed at one side of the camera housing.

The first camera module may be a camera module for photographing a monochrome image, and the second camera module may be a camera module for photographing a color image.

The infrared LED group may include a first LED element synchronized with the shutter speed of the first camera module so as to be flashed to emit light, And a second LED element synchronized to the second LED element.

Since the first camera module photographs the license plate and at the same time the second camera module photographs the surrounding environment such as the shape and position of the entire vehicle, It is easy to acquire evidence for a vehicle and the like.

Since the first and second camera modules are reversibly fixed on the support rails, the camera support rails are arranged in the front and back directions in the camera housing. Therefore, it is easy to attach and detach regardless of the size of the camera lens And the focus and distance can be easily adjusted.

In addition, since the camera housing is made of a closed structure and nitrogen gas is filled therein, it has an excellent weather resistance and moisture resistance even under severe weather conditions.

1 is a block diagram of a camera assembly for recognizing a car number according to the present invention;
2 is a perspective view of the camera assembly,
Figure 3 is a top cross-sectional view of the camera assembly,
4 is an exploded perspective view showing a state of use of the camera assembly,
5 is a view showing the state of use of the camera assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings. However, even if it is indispensable to carry out the present invention, detailed description of the constituent elements that belong to known art or can be easily carried out by the ordinary artisan by the ordinary artisan will be omitted. In order to facilitate the description of the present invention, the direction in which the subject is located with respect to the photographing direction of the camera is referred to as "front" and the direction opposite thereto is referred to as "rearward".

As shown in FIG. 1, a camera assembly 10 for recognizing a car number according to the present invention includes a first camera module 20 for photographing a license plate, a second camera module 20 for photographing the entire vehicle, A control board 50 for controlling operations of the first and second camera modules 20 and 30 and the infrared LED group 40, .

First, as shown in FIGS. 2 and 3, the camera housing 10 preferably has a flat rectangular parallelepiped shape, and has a sealing structure that can block movement of air and moisture. In the inside of the camera housing 10, camera support rails 11 are provided on both sides in the front-back direction.

Next, the first camera module 20 photographs a license plate, and is equipped with an infrared pass filter (IR pass filter), and is reversibly fixed to one of the camera support rails 11. The infrared pass filter may be directly attached to the image sensor or may be mounted in the form of a window in front of the lens of the first camera module 20.

The second camera module 30 photographs the whole of the vehicle with the license plate attached thereto and its periphery, and is reversibly fixed to the other of the camera support rails 11. The second camera module 30 is equipped with an IR cut filter which is installed only during daytime shooting and can be removed at night.

In the present invention, since the first camera module 20 captures only the license plate, it is preferable to use a camera having a relatively long focal distance. The second camera module 30 includes the entire vehicle, It is preferable to use a camera having a relatively short focal distance.

Preferably, the first camera module 20 is a camera module for photographing a monochrome image, and the second camera module 30 is a camera module for photographing a color image. Each of the first and second camera modules 20 and 30 may use a zoom lens or a general fixed lens.

The first and second camera modules 20 and 30 are reversibly installed in the camera supporting rail 11 extending in the front and rear direction inside the camera housing 10 by the fixing means T, Reversible 'means a state in which the fixing state by the fixing means T is released as necessary and is temporarily coupled so as to be fixed at another position.

Therefore, the first and second camera modules 20 and 30 having different lens lengths and sizes can be freely replaced and mounted on one camera housing 10, and furthermore, the first and second camera modules 20, 30 can be changed conveniently. As the fixing means T for fixing the first and second camera modules 20 and 30, a 'fixing bolt' may be used.

Next, the infrared LED group 40 irradiates infrared rays of a specific region toward the subject, and is installed in front of the camera housing 10. FIG. The infrared LED group 40 includes a first LED device 40a synchronized to flash light according to a shutter speed of the first camera module 20, And a second LED element 40b synchronized with the shutter speed of the second LED 40b so as to emit light.

The first LED element 40a is disposed generally around the first camera module 20 and the second LED element 40b is disposed around the second camera module 30. [ However, it is preferable that the number of the first LED elements 40a is relatively larger than that of the second LED elements 40b in order to secure clearer image information on the license plate.

Finally, the control board 50 controls the operation of the first and second camera modules 20 and 30 and the infrared LED group 40, (C). ≪ / RTI > The first and second camera modules 20 and 30 and the infrared LED group 40 suitably supply external power to the first and second camera modules 20 and 30. The first and second camera modules 20 and 30, And functions to synchronize the elements 40a and 40b with each other.

Hereinafter, an operation method of the camera number recognition camera assembly according to the present invention will be described. First, the first camera module 20 is equipped with an infrared pass filter. The infrared pass filter is emitted from the first LED device 40a to selectively pass infrared rays of a specific region. The first LED device 40a is synchronized with the shutter speed of the first camera module 20 so that the first LED device 40a can be turned on and off according to the shutter speed.

Therefore, the first camera module 20 can secure a clear and clear image of the license plate by using the infrared light emitted from the first LED device 40a at night as well as during the day, It is possible to remarkably reduce the computation and image processing load of a central processing unit (CPU) or a digital signal processing device (DSP) for extracting numbers.

On the other hand, the second camera module 30 captures an image of the entire vehicle and its surroundings using natural light during the daytime, and images the infrared ray emitted from the infrared LED group 40 at night . Accordingly, the second camera module 30 captures a black-and-white image using the infrared light at night even if the camera module is used to photograph a color image.

When the infrared cut-off filter is installed in the second camera module 30, the infrared cut filter cuts off the infrared rays emitted from the first LED 40a and photographs the image with visible light during the daytime photographing. At this time, the second LED element 40b does not emit light. However, at the time of night shooting, the infrared cut-off filter is removed, and the second LED element 40b flashes infrared light in accordance with the shutter speed of the second camera module 30. [

However, if the first and second LED elements 40a and 40b simultaneously emit light at night, the quality of the image photographed by the second camera module 30 due to the strong infrared light reflected by the license plate is degraded . Therefore, the shutter opening timing of the first camera module 20 and that of the second camera module 30 are different from each other, so that the light emitting time point of the first LED device 40a and the light emitting time point of the second LED device 40b It is preferable to synchronize them so as not to overlap each other.

In the present invention, by controlling the infrared LED group 40 to emit light in a flickering manner, it is possible to suppress the heat generation of the first and second LED elements 40a and 40b, to extend the service life, and to increase the luminous intensity .

According to a preferred embodiment of the present invention, nitrogen gas is filled in the camera housing 10, and a nitrogen gas filling valve 12 is installed at one side of the camera housing 10. At this time, it is preferable that the internal pressure of the nitrogen gas is maintained at 1.2 to 3 atmospheres higher than the atmospheric pressure so that outside air or moisture does not flow into the camera housing 10. By doing so, it is possible to prevent internal components from being oxidized or corroded due to the inflow of oxygen, moisture or external air remaining in the first and second camera modules 20 and 30, It is possible to prevent a condensation phenomenon of condensation of moisture in the camera lens, an inner window, and the like.

4, the camera supporting rails 11 are provided with sliding slots 11a in the longitudinal direction thereof. The first and second camera modules 20 and 30 are fixed to the fixing means T To be fixed to the sliding groove 11a.

The sliding grooves 11a are preferably formed in two rows, one for each camera supporting rail 11. The sliding groove 11a has a function of facilitating the adjustment of the fixed position and the vertical angle between the front and rear of the first and second camera modules 20 and 30 on the camera supporting rail 11. [

The angle adjusting fitting 13 may be inserted between the camera supporting rail 11 and the first and second camera modules 20 and 30, respectively. As shown in FIG. 5, the shim 13 collects the focal points of the first camera module 20 and the second camera module 30 at a central point and coincides them at one point. It is preferable that the shim 13 is formed in an ∩ shape to facilitate insertion or removal.

The shim 13 changes the angle between the cameras 20 and 30 according to the thickness thereof. For example, when a thick-walled fitting 13 is inserted into the fixing means T positioned in front of both the cameras 20 and 30, the angle between the cameras 20 and 30 becomes narrower, The insertion of the shim 13 having a small thickness causes the angle between the cameras 20 and 30 to be widened so that the distances at which the focal points coincide with each other are relatively distant from each other. As described above, in the present invention, by adjusting the angle between the cameras 20 and 30 using the thickness of the fitting 13, the distances of the focal points of the cameras 20 and 30 can be adjusted.

Meanwhile, the camera assembly according to the present invention sufficiently removes the moisture of all the components including the first and second camera modules 20 and 30 using the parts dryer before assembly. Subsequently, each component is assembled into the camera housing 10 one by one, the air inside the housing 10 is completely removed through the air valve 12, and then, through the air valve 12, To fill with nitrogen gas.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, the scope of protection of the present invention is not limited by these embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. It will not escape.

10; Camera housing 11; Camera support rail
11a; A sliding groove 12; Air valve
13; Shims 20; The first camera module
30; A second camera module 40; Infrared LED Group
40a; A first LED element 40b; The second LED element
50; Control board
T; Fixing means C; Connector

Claims (9)

A camera housing (10) having a closed structure and provided with camera support rails (11) on both sides in the front and rear direction;
A first camera module (20) reversibly fixed to one of the camera support rails (11) and equipped with an infrared pass filter (IR pass filter) and photographing a license plate;
A second camera module (30) reversibly fixed to the other of the camera supporting rails (11) and photographing the entire vehicle and its surroundings;
An infrared LED group (40) provided in front of the camera housing (10) for irradiating infrared rays of a specific region toward a subject;
A control board 50 for controlling operations of the first and second camera modules 20 and 30 and the infrared LED group 40; And,
Wherein an angle adjusting fitting (13) is inserted between the camera supporting rail (11) and the first and second camera modules (20, 30), respectively.
2. The air conditioner according to claim 1, wherein a nitrogen gas is filled in the inside of the camera housing (10), and an air valve (12) for filling a nitrogen gas is installed on one side of the camera housing Recognition camera assembly.
3. The camera assembly according to claim 2, wherein the internal pressure of the nitrogen gas filled in the camera housing (10) is 1.2 to 3 atm.
The camera module according to claim 1 or 2, wherein the camera support rail (11) is provided with a sliding groove (11a) in the longitudinal direction thereof, and the first and second camera modules (20, 30) T) is fixed to the sliding groove (11a).
delete 3. The apparatus according to claim 1 or 2, wherein the first camera module (20) is a camera module for photographing a monochrome image, and the second camera module (30) is a camera module for photographing a color image. A camera assembly for number recognition.
7. The camera assembly of claim 6, wherein the second camera module (30) is provided with an infrared cut filter (IR cut filter) installed only during daytime shooting.
The infrared LED group (40) according to claim 1 or 2, wherein the infrared LED group (40) comprises a first LED element (40a) synchronized to flash light in accordance with a shutter speed of the first camera module (20) And a second LED element (40b) synchronized to emit light in accordance with a shutter speed of the second camera module (30).
9. The camera assembly of claim 8, wherein the first LED element (40a) and the second LED element (40b) are synchronized so that light emission time points do not overlap each other at night.
KR1020150094541A 2015-07-02 2015-07-02 Camera assembly for recognizing a license number of vehicle KR101554169B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101678420B1 (en) * 2016-02-12 2016-11-22 주식회사 나눔컴퍼니 Searchlight and car number recognition system using the same
US10547829B2 (en) 2016-06-16 2020-01-28 Samsung Electronics Co., Ltd. Image detecting device and image detecting method using the same
CN116567375A (en) * 2023-04-24 2023-08-08 禾多科技（北京）有限公司 Vehicle-mounted front-view camera all-in-one machine, vehicle and vehicle speed control method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100716260B1 (en) 2007-01-30 2007-05-08 주식회사 엘리소프트 A camera apparatus for recognizing number of vehicles
KR101151523B1 (en) * 2010-11-11 2012-05-30 권호철 apparatus for recognizing number of vehicle using dual camera and method thereof
JP2014182071A (en) * 2013-03-21 2014-09-29 Tamron Co Ltd Infrared imaging device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100716260B1 (en) 2007-01-30 2007-05-08 주식회사 엘리소프트 A camera apparatus for recognizing number of vehicles
KR101151523B1 (en) * 2010-11-11 2012-05-30 권호철 apparatus for recognizing number of vehicle using dual camera and method thereof
JP2014182071A (en) * 2013-03-21 2014-09-29 Tamron Co Ltd Infrared imaging device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101678420B1 (en) * 2016-02-12 2016-11-22 주식회사 나눔컴퍼니 Searchlight and car number recognition system using the same
US10547829B2 (en) 2016-06-16 2020-01-28 Samsung Electronics Co., Ltd. Image detecting device and image detecting method using the same
US11350062B2 (en) 2016-06-16 2022-05-31 Samsung Electronics Co., Ltd. Image detecting device and image detecting method using the same
CN116567375A (en) * 2023-04-24 2023-08-08 禾多科技（北京）有限公司 Vehicle-mounted front-view camera all-in-one machine, vehicle and vehicle speed control method
CN116567375B (en) * 2023-04-24 2024-02-02 禾多科技（北京）有限公司 Vehicle-mounted front-view camera all-in-one machine, vehicle and vehicle speed control method

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