KR100995890B1 - Luminance controller of LED message signs using for camera and it's control process - Google Patents

Abstract

The present invention relates to a brightness control apparatus of an electronic signboard, and photographs a vehicle traveling in front of a camera provided on one side of the signboard, extracts the photographed image, and detects a weather change according to motion / color temperature. The present invention relates to a display board brightness control apparatus using a camera and a control method thereof, which transmits brightness information according to a weather change to a display board so that information of the display board can be displayed clearly on a traveling vehicle.

Conventional LED display has a problem that can not control the brightness according to the weather conditions, the present invention is provided in the lower center of the display panel (1) consisting of a plurality of LED module (2) to solve this problem, the vehicle traveling on the road Photographing the camera 10 and transmitting the photographed image information to the image processor 21; An image processor 21 which removes noise from the image information transmitted from the camera 10 and transmits only the scene where the vehicle is photographed to the image extractor 22; An image extracting unit 22 for sequentially extracting a plurality of still images at predetermined time intervals in order to obtain luminance information from the video transmitted from the image processing unit 21; A color temperature detector 23 which detects a color temperature of the still image transmitted from the image extractor 22 and transmits the detected color temperature to a weather change detector 24; A motion detection unit 25 for comparing the plurality of still images transmitted from the image extraction unit 22 and detecting the presence or absence of motion, and transmitting the result to the weather change detection unit 24; The fog / snow ratio / cloudy / sunnyness of the weather is determined through the color temperature detector 23, and the luminance value of the LED module 2 is adjusted through the controller 26 according to the detection value transmitted through the motion detector 25. Weather change detection unit 24 and the; The brightness control device using a camera is characterized in that it comprises a control unit 26 for adjusting the brightness of the LED module 2 in accordance with the weather conditions transmitted from the weather change detection unit 24.

Therefore, the display board brightness adjusting apparatus using the camera according to the present invention, through the camera 10 provided on one side of the display board 1, photographing the vehicle traveling in front, and extracts the captured image to the motion / color temperature After detecting the change in the weather, the brightness of the signboard is automatically adjusted according to the weather condition, it is possible to deliver a clear signboard information to the driver passing through the road. In addition, the present invention transmits the image taken by the camera to the external computer 40 through the communication module 30, there is another effect that can monitor in real time the vehicle driving state of the road.

LED, electronic board, camera, brightness control, vehicle monitoring

Description

Luminance controller of LED message signs using for camera and it's control process}

The present invention relates to a brightness control device of an LED signboard, by photographing a vehicle traveling in front through a camera provided on one side of the signboard, and extracting the photographed image to detect weather changes according to motion / color temperature. The present invention relates to a display board brightness adjusting device using a camera and a method of controlling the same, which transmits brightness information according to a weather change to a display board so that information of the display board can be displayed clearly on a driving vehicle.

In the conventional electronic board, three LED devices displaying color light of red (R), green (G), and blue (B) are composed of one LED pixel, and a plurality of LED pixels are formed in a matrix form. It is produced by an LED module configured to be arranged to display an image.

In this case, the LED display board used as a color image display system requires M × N LED pixels for displaying images each with M × N resolution, and one LED pixel includes three colors of R, G, and B colors. Since a total of 3 x M x N LED elements are required because of LEDs, for example, 3 x 640 x 480 (921,600) LED elements are required in an LED display having a resolution of 640 x 480.

In this case, the LED signboard is generally used for displaying advertisement information, news information, etc. for an unspecified number indoors or outdoors, or for providing traffic information on a road, so that the installation position of the LED signboard may be improved. It is preferable to adjust the brightness according to the weather conditions.

That is, on a clear day, if the brightness is too high, the light is diffused and the letters on the display board appear to be agglomerated, and on a cloudy day, the brightness is clearly reversed to ensure clear readability.

Recently, a device for controlling luminance by a passive method of installing a CDS sensor has been introduced. However, since the CDS sensor checks only illuminance around an electric sign, there is a problem that it is not suitable for improving readability to a user. In particular, when the LED is turned on at night, the CDS sensor has a problem that the light generated from the LED is introduced, it does not recognize the correct illuminance of the surroundings.

The present invention is to solve the above problems, photographing a vehicle running in front of the electronic sign, and extracting the photographed image to detect the weather change according to the motion / color temperature, the luminance according to the change of the surrounding weather It is an object of the present invention to provide a display board brightness adjusting device using a camera and a method of controlling the same so that information of the display board can be clearly displayed on a vehicle which is driven by transmitting the information.

In addition, another object of the present invention is to provide a brightness control apparatus and a control method using a camera that can contribute to establishing traffic information by transmitting the captured image wirelessly or by wire.

Display board brightness control device using a camera according to the present invention is provided in the lower center portion of the display board consisting of a plurality of LED modules to photograph the vehicle traveling on the road, and transmits the captured image information to the image processing unit; An image processor which removes noise from the image information transmitted from the camera and transmits only the scene where the vehicle is photographed to the image extractor; An image extracting unit extracting a plurality of still images sequentially at predetermined times according to time to obtain luminance information from the moving image transmitted from the image processing unit; A color temperature detector which detects a color temperature of the still image transmitted from the image extractor and transmits the detected color temperature to a weather change detector; A motion detector for comparing the plurality of still images transmitted from the image extractor to detect the presence of motion, and transmitting the result to a weather change detector; A weather change detection unit determining the fog / snow ratio / cloudy / sunnyness of the weather through the color temperature detection unit, and adjusting the luminance value of the LED module through the control unit according to the detection value transmitted through the motion detection unit; It is characterized in that it comprises a control unit for controlling the brightness of the LED module according to the weather conditions transmitted from the weather change detection unit.

Display board brightness control device using a camera according to the present invention through the camera 10 provided on one side of the display board (1), photographing the vehicle traveling in front, and extracts the photographed image to the weather according to the motion / color temperature After detecting the change, the brightness of the signboard is automatically adjusted according to the weather condition, thereby providing a clear signboard information to the driver passing through the road.

In addition, the present invention transmits the image taken by the camera to the external computer 40 through the communication module 30, there is another effect that can monitor in real time the vehicle driving state of the road.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view schematically showing a state in which a signboard brightness control apparatus using a camera according to the present invention is installed on a road, and FIG. 2 is a schematic diagram schematically showing photographing a vehicle running on a road with a camera of the present invention. FIG. 3 is a block diagram of a signboard brightness adjusting device using a camera according to the present invention, and FIG. 4 is a flowchart schematically illustrating a control operation of the signboard brightness adjusting device using a camera according to the present invention.

In the display board brightness control device using a camera according to the present invention as shown in Figure 1 and 2, in providing the vehicle driving information consisting of a character or a picture to the driver (or occupant) of the vehicle running on the road, By determining the current weather condition according to the image taken by the camera, the brightness of the LED module is automatically adjusted, and at the same time, the image information taken by the camera can be sent to the outside to supervise traffic information on the road.

To this end, as shown in FIG. 3, the brightness adjusting apparatus using the camera according to the present invention includes a camera 10 at a lower center of the display board 1 including the plurality of LED modules 2, and the display board 1. The main controller 20 is provided inside the main controller 20, and the main controller 20 converts and analyzes the image captured by the camera through a predetermined signal processing procedure to determine the luminance of the LED module 2 according to weather conditions. Will be controlled automatically.

That is, the main controller 20 includes an image processor 21 for removing noise from the image information transmitted from the camera 10 and transmitting only the scene where the vehicle is photographed to the image extractor 22; An image extracting unit 22 for sequentially extracting a plurality of still images at predetermined time intervals in order to obtain luminance information from the video transmitted from the image processing unit 21; A color temperature detector 23 which detects a color temperature of the still image transmitted from the image extractor 22 and transmits the detected color temperature to a weather change detector 24; A motion detection unit 25 for comparing the plurality of still images transmitted from the image extraction unit 22 and detecting the presence or absence of motion, and transmitting the result to the weather change detection unit 24; The fog / snow ratio / cloudy / sunnyness of the weather is determined through the color temperature detector 23, and the luminance value of the LED module 2 is adjusted through the controller 26 according to the detection value transmitted through the motion detector 25. Weather change detection unit 24 and the; It includes a control unit 26 for adjusting the brightness of the LED module 2 in accordance with the weather conditions transmitted from the weather change detection unit 24.

The camera 10 may selectively use a day camera or a night camera using an infrared LED according to the purpose of use, but in the brightness control which is the primary purpose of the present invention, the daytime weather state is mainly considered. Since it is a target, the following describes the operation state based on the daytime camera.

The video information captured by the camera 10 is transferred to the image processor 21, and the image processor 21 transmits a clear image from which noise is removed to the image extractor 22 and the communication module 30. Done.

At this time, since the camera is impossible to shoot in the case of extreme fog, the present invention determines in advance whether or not the 'shooting state' as a supplement to this.

That is, the image processor 21 transmits the initially photographed image to the controller 26. When the distribution of white is 80% or more in the image, the controller 26 stops recording and immediately starts the LED module. Enhance the brightness of (2) to the best.

The communication module 30 is a technical specificity of the present invention for determining weather conditions by the camera 10, and the image from which the noise is removed from the image processor 21 is externally wired or wirelessly through the communication module 30. Since it is transmitted to 40, the external computer 40 can check the vehicle traffic state of the road in real time.

In addition, the image extractor 22 extracts a still image every set time (for example, every 0.5 seconds) to analyze the moving image transmitted from the image processor 21, and then the color temperature detector 23 and the motion detector 25. To pass).

The color temperature detector 23 classifies the photographed image into 'A' grade corresponding to 'snow / rain / hail', 'B' grade corresponding to 'cloudy', and 'C' grade corresponding to 'sunny' The weather change detection unit 24 is transmitted.

When the color temperature is A grade, the weather change detection unit 24 receives the motion change value of the vehicle due to snow / rain / hail through the motion detection unit 25 again, and when the motion change value is equal to or greater than the reference value, 'snow / rain' / Hail ('bad weather conditions), and if the motion variation value is less than the reference value is determined to be' cloudy 'and transmits to the controller 26.

In addition, the weather change detection unit 24 determines that the weather is "cloudy" when the color temperature is B grade, and determines that the weather is "clear" when the color temperature is C grade, and transmits it to the controller 26.

Accordingly, the controller 26 converts the brightness of the LED module 2 to 'best' in the case of an extreme fog situation, and sets the brightness of the LED module 2 to 'up' in the case of 'snow / rain / hail'. In case of 'cloudy', the brightness of the LED module is changed to 'medium', and in case of 'clear', the brightness of the LED module 2 is converted to 'phase'.

(Basically, the LED module is set to low brightness to reduce power consumption and is converted to proper brightness according to the control value transmitted from the controller.)

On the other hand, the control method of the display board brightness control apparatus using a camera according to the present invention proceeds according to the flowchart shown in FIG.

First, power is supplied to the electric signboard 1 so that the camera 10 is turned on (S10) to photograph the situation of the road.

The image captured by the camera 10 is transmitted to the controller 26 through the image processor 21, and the controller 26 determines whether the current weather state is a 'capable of shooting' (S11).

In this case, the 'capable of recording state' means a state in which it is determined that the weather condition is not 'severe fog' because the ratio of white is maintained to 80% or less on the entire screen of the captured image. In operation 26, the brightness of the LED module 2 is changed to a 'best' state (S15).

Detecting the ratio of white (or specific color) to the entire screen and performing a predetermined control process through it is a common known technique in the conventional image processing method, and thus, further description thereof will be omitted.

In addition, when the current meteorological state is a state capable of photographing, the camera 10 captures a vehicle traveling on the road (S12) and passes a predetermined signal processing procedure to remove noise through the image processor 21. 22).

The image extractor 22 extracts a still image from an image captured by the vehicle (S13) and transmits the still image to the color temperature detector 23 and the motion detector 25. The color temperature detector 23 extracts the color temperature from the extracted still image. The determination is made (S14).

At this time, when the color temperature is A grade corresponding to 'rain / snow / hail' (S20), the detection of the motion transmitted from the motion extraction unit 25 (S21) and the change of the variation value is determined (S22), If the change value is greater than or equal to the reference value, the brightness of the LED module 2 is switched to 'up' (S23), otherwise the brightness is switched to 'middle' (S24).

In addition, when the color temperature is 'B' corresponding to 'cloudy' (S30), the brightness is changed to 'medium' (S24), and when the color temperature is 'C' corresponding to 'sunny' (S40), the brightness is 'up' It is switched (S41).

In addition, when the color temperature is C class (clear) and the image taken by the camera is a backlight, the driver of the road is not clear view of the signboard, so that the brightness is switched to 'best'. Determining whether or not "backlight" is a general known technique in the conventional camera photographing method, and thus, further detailed description thereof will be omitted.

The brightness of the LED module 2 divided into 'best, top, middle, and bottom' is for convenience of understanding, and may be subdivided in various ways according to the installation environment and conditions. The technical peculiarity is to analyze the captured image to grasp the weather condition and to automatically adjust the brightness of the LED display board according to the detected weather condition.

The present invention as described above is not limited to the above-described specific embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various changes without departing from the gist of the present invention as claimed in the claims. will be.

1 is a front view schematically showing a state in which a signboard brightness adjusting device using a camera according to the present invention is installed on a road;

2 is a schematic diagram schematically showing photographing a vehicle running on a road with the camera of the present invention;

3 is a block diagram of a display board brightness control device using a camera according to the present invention;

Figure 4 is a flow chart schematically showing the control operation of the display board brightness control device using a camera according to the present invention.

Description of the Related Art

1: Brightness Automatic Display Board 2: LED Module

3: vehicle 10: camera

20: main controller 21: image processing unit

22: image extraction unit 23: color temperature detection unit

24: weather change detection unit 25: motion detection unit

26: control unit 30: communication module

40: external computer

Claims (4)

A camera 10 provided at a lower center portion of the electronic display panel 1 including a plurality of LED modules 2 to photograph a vehicle traveling on a road and transmit the photographed image information to the image processor 21; An image processor 21 which removes noise from the image information transmitted from the camera 10 and transmits only the scene where the vehicle is photographed to the image extractor 22; An image extracting unit 22 for sequentially extracting a plurality of still images at predetermined time intervals in order to obtain luminance information from the video transmitted from the image processing unit 21; A color temperature detector 23 which detects a color temperature of the still image transmitted from the image extractor 22 and transmits the detected color temperature to a weather change detector 24; A motion detection unit 25 for comparing the plurality of still images transmitted from the image extraction unit 22 and detecting the presence or absence of motion, and transmitting the result to the weather change detection unit 24; The weather condition is determined by the color temperature detector 23 and transmitted to the controller 26. When the weather corresponds to snow / rain / hail, the change value transmitted through the motion detector 25 is transmitted to the controller 26. Weather change detection unit 24 for adjusting the luminance value of the LED module (2); A controller 26 for adjusting the brightness of the LED module 2 according to the weather condition transmitted from the weather change detector 24; Display board brightness control device using a camera, characterized in that comprising a. The method of claim 1, The image processor 21 removes noise from the image information transmitted from the camera 10, and displays the scene where the vehicle is photographed through the communication module 30 by either a wired or wireless method. Display board brightness control device using a camera, characterized in that for transmitting in real time. In the control method of the brightness adjusting device, The camera 10 is turned on (S10); Analyzing the image photographed by the camera 10 to determine whether the current meteorological condition is a photographable state (S11); If the current weather condition is not a photographable state, the brightness of the LED module 2 is switched to 'best' (S15), and if the current weather condition is a photographable state, photographing a vehicle passing through the road again (S12). ; Extracting a still image from the captured image of the vehicle (S13); Determining a color temperature from the extracted still image (S14); When the color temperature is A class corresponding to 'rain / snow / hail' (S20), the motion extracting unit 25 detects the motion transmitted (S21) and determines the change in the variation value (S22). If the reference value is greater than or equal to the brightness of the LED module 2 to 'phase' (S23), otherwise converting the brightness to 'medium' (S24); If the color temperature is a B grade corresponding to 'cloudy' (S30), switching the brightness to 'medium' (S24); If the color temperature is a C grade corresponding to 'sunny' (S40), switching the brightness to 'phase' (S41); The control method of the display board brightness control device using a camera, characterized in that proceeding sequentially. The method of claim 3, wherein In the photographic state, the brightness control device using a camera, characterized in that the weather condition is determined not to be 'severe fog' by maintaining the ratio of white to 80% or less on the entire screen of the captured image. Control method.

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