KR102179298B1 - Shadow-Compensated LED Electronic Board According To The Shadow And Solar Angle According To The Surrounding Environment - Google Patents

Abstract

Disclosed is an LED display with shadow compensation by a sun angle and shadows in accordance with a surrounding environment. The LED display with shadow compensation by a sun angle and shadows in accordance with a surrounding environment includes: an illuminance sensor part formed with an illuminance sensor or digital camera generating basic data about there is sunshine or shade on the front side of an electronic display; an illuminance calculation part, if data inputted from the illuminance sensor part is data by the illuminance sensor, identifying a position of each illuminance sensor so as to estimate positions of a shade part and a sunshine part of the electronic display, thereby converting an analogue signal outputted from the illuminance sensor into a digital signal for communication with an electronic display management computer; and a management computer correction logic part correcting and displaying a source image on the electronic display by calculating correction data for improving the visibility of images on the electronic display by determining the sunshine and shade parts of the electronic display and sunshine, considering an illuminance value inputted from the illuminance sensor as an illuminance deviation value and a photographed image received from the digital camera as a brightness data value by pixel, based on the data inputted from the digital camera or the illuminance calculation part. Therefore, the present invention has an effect of increasing visibility enabling a user to always see clear images on an electronic display without interference by sunshine or shade.

Description

Shadow-Compensated LED Electronic Board According To The Shadow And Solar Angle According To The Surrounding Environment}

The present invention relates to an LED billboard. In particular, it is installed outdoors and conveys information to the spectators. The image of the electronic signboard looks bright in the shadow part of the surrounding buildings or landmarks, while the image displayed in the part where the sunlight shines is relatively dim. It relates to an LED display that compensates for shadows according to the sun's angle and shadows according to the surrounding environment by making the image darker in the shaded area or brightly correcting the image in the area exposed to sunlight.

In general, it is well known that with the development of LED devices, image technology, and LED correction technology for electronic signs, the image quality of electronic signs can display high-definition, high-quality images suitable for the digital age. And with the formation of the signage market, the electronic display market is on the rise, and the electronic display is used in various ways.

In particular, outdoor sports billboards for horse racing, bicycle racing, and racing, urban outdoor advertising billboards, and outdoor sports billboards that express game scores or situations, have shadows cast on the billboards when the solar altitude decreases and direct sunlight. When the electric sign is divided into two parts, the image or text is clearly visible in the shaded area, while the image or text is relatively faint on the side where the sunlight is lit, causing problems in identification and recognition.

In order to minimize this problem, electronic boards that deliver information to a large number of the public have various corrections to increase the display image quality of the electronic board in order to actively respond to the demands of the times for displaying high-quality, high-resolution images beyond simple image display while starting digital broadcasting. The method is being studied.

The correction in the electronic signboard is mainly to make the difference in brightness and chromaticity of the LED, which is a display element, uniform. The "individual correction method for LED based on the operating computer of the LED signboard" disclosed in Patent No. 10-1893949 registered by the present applicant It is to run on the operating computer to calibrate the LEDs to be uniform brightness and chromaticity by measuring the brightness and chromaticity of each LED measured by the instrument.

In addition, the “on-system LED individual correction and correction factor imaging for easy verification and correction” disclosed in Patent No. 10-1374648 facilitates monitoring by converting the correction value into a BMP file that is an image. It is to minimize the deviation by correcting the LED with a correction electric sign that combines

Also disclosed in Patent No. 10-0995890 is a method of adjusting the brightness of an electronic signage by a chromaticity difference by photographing a nearby car with a camera, and a method of real-time gamma correction. This correction is a method of correcting the entire electronic signboard.In the shadows of conventional buildings or features, the image of the signboard looks bright, whereas the part exposed to sunlight shows a relatively blurred image. This fall-off point is implied as it is.

Therefore, according to the sunlight and shade on the electric signboard, the contrast of the part where the sunlight shines is low, making the screen look dim, and the development of an electric sign that enhances visibility by correcting the electric signboard in the sun and shade areas that are brightly reflected by the relatively shaded electric signboard part. This is in desperate need.

KR Patent No. 10-1893949 KR Patent No. 10-1374648 KR Patent No. 10-0995890

The present invention was developed to compensate for the problems of the prior art and provide various additional advantages, and according to the sunlight and shade reflected on the image of the electronic signboard, the image of the electronic signboard of the corresponding part is darkened or the image of the corresponding part is brightened. The purpose of this is to provide an LED display that compensates for the shadow according to the surrounding environment and the sun angle, which improves visibility.

The above object is achieved by a shadow compensation LED display according to the shadow according to the surrounding environment and the sun angle provided according to the present invention.

According to an aspect of the disclosed invention, a shadow compensation LED billboard according to a shadow according to a surrounding environment and a shade according to a sun angle is provided, comprising a digital camera or an illuminance sensor that generates basic data on whether sunlight is shining or shade on the front of the billboard. Sensor unit; When the data input from the illuminance sensor unit is data from the illuminance sensor, the position of each illuminance sensor is identified so that the positions of the sunlight and shade portions of the electric signboard can be estimated, and the analog signal output from the illuminance sensor is obtained. An illuminance calculation unit for converting a digital signal for communication with an electronic display operating computer; Based on data input from the illuminance calculator or the digital camera, the illuminance value input from the illuminance sensor is an illuminance deviation value, and the photographed image received from the digital camera is a luminance data value for each pixel, sunlight and sunlight Sunlight, shade, and blur based on data input from the illuminance sensor or digital camera, which calculates correction data to improve the visibility of the electric signboard image by determining the part and shade, and corrects the source image to be displayed on the signboard. And illuminance analysis logic to determine whether to perform correction by grasping the night state, and calculating the position of the shade by adaptively matching the coordinates of the displayed image of the operating computer monitor of the electronic board and the coordinates of the electronic board in a 1:1 manner. Contrary to the date and time logging logic that inserts date and time information into the logic and shade location information, and the received data, the shaded portion lowers the data luminance and the sunlight portion increases to create a bmp-shaped correction data image. Operation computer correction logic unit consisting of data storage logic to store shade information with the date and time logged and use it as big data and image signal correction logic to create a corrected image to be displayed by overlapping the source image with the correction data image. Include.

The illuminance calculating unit, for communication with the electronic display operating computer, the illuminance sensor position calculation logic to identify the position of each illuminance sensor and the analog signal output from the illuminance sensor so that the position of the sunlight shining and shaded portions of the billboard can be estimated. It is characterized by consisting of digital conversion logic that converts to digital.

The digital camera or illuminance sensor is used to detect sunlight and shade, but irregular shades are attached to the digital camera or by the illuminance sensor attached to the front of the LED module, and regular shades are attached to the edge of the signboard in the form of x, y coordinates. It is characterized in that it is detected by an illuminance sensor.

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The image signal correction corrects the image data dark for the image in the shaded part of the electric signboard, while the image data for the sunlight part corrects the image data brightly, but has a variable constant that can be changed and set according to the intensity of sunlight and the latitude of the place where the signboard is installed. It is characterized by configuring a program.

It is characterized in that the data storage logic stores shade data for each year and time, so that when the surrounding environment is the same, it can be used as big data for shade from the following year.

According to the disclosed embodiment, in the case of an outdoor display board, the displayed image is immediately corrected for a decrease in visibility of the sunlight part due to the difference in contrast between the part where sunlight is illuminated by the sun and the shaded part. Gives a boosting effect.

In addition, in order to increase visibility, the expression that dims the lighting of the shaded area or the expression that brightly exposes the sunlight-exposed area and darken the shaded area gives an effect that can be expressed without an increase in power consumption.

In addition, when using data collected for a long time through big data, it simply judges that sunlight is affected by clouds or rain on that day, and gives an effect that can be easily applied because there is no calculation process.

1 is a block diagram showing the configuration of a shadow compensation LED billboard according to a shadow and a sun angle according to the surrounding environment of the present invention,
2 is a configuration diagram of a shade detection configuration of an electric signboard by a digital camera in FIG. 1,
3 is a configuration diagram of a shade detection of an electric sign by an illuminance sensor in FIG. 1,
4B, 4C, and 4C are views showing that the illuminance sensor of FIG. 1 is attached to the edge of the electric signboard,
5A and 5B are exemplary views of shades of various forms of an electric signboard,
6A and 6B are exemplary views to which the method of implementing the correction of an electric signboard according to the present invention is applied,
7 is a flow chart of the operating computer correction logic shown in FIG.

Embodiments of the present invention are illustrated for the purpose of explaining the technical idea of the present invention.

The scope of the rights according to the present invention is not limited to the embodiments presented below or the detailed description of this embodiment.

All technical terms and scientific terms used in the present invention have meanings generally understood by those of ordinary skill in the art, unless otherwise defined. All terms used in the present invention are selected for the purpose of more clearly explaining the following invention content, and are not selected to limit the scope of the rights according to the present invention.

Expressions such as "comprising," "having," "having," and the like used in the present invention are open terms including the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the corresponding expression is included (open -ended terms).

The expression of the singular form described in the present invention may include the meaning of the plural, unless otherwise stated, and this applies equally to the expression of the singular form described in the claims.

In addition, in the present invention, when it is mentioned that a certain component is "connected" to another component, the certain component can be directly connected to or can be connected to the other component, or a new other component is used. It is to be understood that it can be connected or can be connected to.

In addition, direction indicators such as "front" and "front" used in the present invention refer to the x-axis direction in the accompanying drawings, and direction indicators such as "rear" and "rear" mean the opposite direction.

Hereinafter, with reference to the accompanying drawings, a description will be made of an embodiment of a shadow compensation LED display panel according to a shadow according to the surrounding environment and a sun angle according to the present invention. In the accompanying drawings, the same or corresponding elements are assigned the same reference numerals. In addition, in the description of the following embodiments, overlapping descriptions of the same or corresponding components may be omitted. However, even if a description of a component is omitted, it is not intended that the component is not included in any embodiment.

It is preferable to install the outdoor billboard facing north away from the sun as it has little influence from the sun during the day, but in this case, it is not easy to install because sunlight shines on the stands.

If the signboard is facing south, east, or west, the sunlight directly shines on the signboard in the morning, sunset, and winter when the sun's altitude is low, and the shaded part is bright and clear if the image display surface of the signboard is partially shaded by surrounding objects. Relatively, the area directly lit by sunlight is difficult to recognize because the contrast is lowered. In the case of an electric sign in which numbers or letters must be checked, it is necessary to immediately correct it to increase visibility, and the present invention is very suitable for such use.

1 is a block diagram showing the configuration of a shadow compensation LED billboard according to a shadow and a sun angle according to the surrounding environment of the present invention.

As shown in the figure, if the configuration of the electric sign 100 according to the present invention is roughly divided, it includes an illuminance sensor unit 110, an illuminance calculation unit 130, and a correction logic unit 150 of the electronic display operating computer.

The illuminance sensor unit 110 generates basic data on whether sunlight is shining on the front of the electric signboard or shade, and the illuminance sensor unit 110 may be configured with an illuminance sensor 112 or a digital camera 114.

When the data input from the illuminance sensor unit 110 is data by the illuminance sensor 112, the illuminance calculation unit 130 may estimate the positions of the sunlight and shade portions of the electric signboard. 112), and converts the analog signal output from the illuminance sensor 112 into a digital signal for communication with the electronic board operating computer 150a (refer to FIGS. 2 and 3), and the illuminance calculation unit 130 ) Is an illuminance sensor position calculation logic 132 for identifying the position of each illuminance sensor and an analog signal output from the illuminance sensor 112 so as to estimate the positions of the sunlight and shade portions of the electronic display board operating computer 150a. ) (Refer to FIGS. 2 and 3), which is composed of a digital conversion logic 134 that converts to digital for communication.In the case of the digital conversion logic 134, a binary 8 BIT value of 256 steps including an A/D converter It adopts a processor that outputs and processes and processes I2C communication. Converting analog signal illuminance value to digital, since the location is not the same and various, it is desirable to set the adjustment terminal to output the appropriate value for the installation location.

The correction logic unit 150 of the display board operating computer 150a is based on data directly input from the illuminance calculation unit 130 or the digital camera 114, but the illuminance value input from the illuminance sensor 112 is As an illuminance deviation value, the photographed image received by the digital camera 114 is a luminance data value for each pixel, and correction data for improving the visibility of the image on the billboard is calculated by determining the sunlight and the sunlight and the shade of the billboard. It is a device that corrects the source image and displays it on the electric signboard, and it is a big data storage that stores data on shade, such as monitoring and applying shade in real time, predicting and applying the sun angle, or using data from the past one year.

As shown in FIG. 1, the correction logic unit 150 of the operating computer as described above includes an illuminance analysis logic 151, an electric signboard position illuminance calculation logic 152, a date and time logging logic 153, and a correction data image generation logic. 154, a data storage logic 155, and an image signal correction logic 156.

The illuminance analysis logic 151 is divided into two cases: a case of receiving shade data of an electric signboard from the illuminance sensor 112 of the illuminance calculation unit 130, and a case of receiving an image image photographing an electric signboard from the digital camera 114.

The illuminance analysis logic 151 compares the illuminance deviation, and if the deviation is small, it determines that the sunlight is cloudy, and if the value is low, the illuminance analysis logic 151 does not perform the function of the present invention, and the digital camera 114 The image captured from the camera is analyzed by analyzing the luminance data value for each pixel to determine whether the electric sign is in the shade.

When using the illuminance sensor 112, the illuminance calculation logic 152 of the signboard position provides the positional information from the illuminance calculating unit 130, so that the position of the display surface of the signboard can be easily grasped. It is easy to correspond if the coordinates of the displayed image of and the coordinates of the electronic signboard are adaptively matched 1:1, and in the case of the digital camera 114, the x of the shade is based on the determination of whether the electric signboard is shaded by the illuminance analysis logic 151. , Calculate the position of the shade by calculating the y-coordinate position.

Such data is stored in the data storage logic 155 by adding time information in the date and time logging logic 153, and at the same time, in the correction data image generation logic 154, the shaded portion is data luminance opposite to the received data. The bmp-type correction data image is created by lowering and increasing the sunlight part. However, if data is increased, it may be darkened by the rounding number, so an operation process including the rounding number is required.

The image signal correction logic 156 overlaps the source image with the correction data image generation logic 154 to generate the corrected image to be finally displayed, and corrects it by the following operation. That is, if the source image is multiplied by the correction data, the correction data of 16 bits in binary is calculated, but since the DVI signal system is 8 bits, only the upper D15 to D8 digit data is taken, and the method of selecting is multiplied and shifted 8 times from the upper bit when the number of binary digits becomes 16 digits. When stored in memory, the lower 8 bits are automatically deleted. However, if the electronic display operating computer 150a is a 10 BIT system, up to D15 to D6 are utilized, and necessary data corrected in this manner can be obtained.

This correction method is the same as in Patent Document 1 (Patent No. 10-1893949) applied and registered by the present applicant, "An individual correction method for LEDs based on an operating computer for an LED display".

The data storage logic 155 is a place to store correction data images by date and time, and if the images are stored from time to time, it is preferable to store the data by time, and an image between time and time can be calculated by calculation.

FIG. 2 is a block diagram illustrating a configuration of detecting a shade of an electric sign by a digital camera in FIG. 1.

As shown in the drawing, it is composed of a camera, which is an illuminance sensor unit 110, an electric sign operating computer 150a, a main controller 170, and a local controller 180, and except for the illuminance sensor unit 110, a general system of an electric signboard Is the same as In addition, any camera that acts as a sensor can be referred to as a digital camera 114, and the connection between the digital camera 114 and the electric sign 100 can be communicated using a LAN or light.

FIG. 3 is a configuration diagram illustrating a shade detection configuration of an electric sign by an illuminance sensor in FIG. 1.

As shown in the drawing, the configuration for detecting the shade of the electric sign by the illumination sensor is also, as shown in FIG. 2, the illumination sensor 112 and the illumination calculation unit 130 of the illumination sensor unit 110 and the electric display operating computer 150a, main It is composed of a controller 170 and a local controller 180, and is the same as a general system of an electric signboard except for the illuminance sensor unit 110.

4A is a view showing that the illuminance sensor of FIG. 1 is attached to the LED module.

As shown in the drawing, since the illuminance sensor 112 is entirely distributed over the front of the electric signboard 100, a large number of sensors are installed to obtain detailed information about the sunlight and shade of the electric signboard, but installed in the LED module 12 There is a hassle.

Therefore, it is preferable to apply when the digital camera 114 cannot be installed in front of the electric sign 200 and the shade is irregular.

4B and 4C are views showing that the illuminance sensor of FIG. 1 is attached to the edge of the electric signboard.

As shown in the drawing, when the shape of the shade of the electric sign 100 changes linearly with a certain shape, the illumination sensor 112 is arranged at equal intervals in a square shape along the electric sign rim 102 in a suitable shape. The shape of the shade for the electric sign can be inferred by the x and y-axis coordinates of the rim of the electric sign of the illumination sensor 112 installed along (102). Installation of the illuminance sensor 112 to the edge 102 of the electric signboard has an advantage that it is easier to install than the illuminance sensor 112 in the LED module 12.

5A and 5B are exemplary views of various shades of an electric signboard.

As shown in the drawing, FIG. 5A illustrates an irregular shade of an electric sign, and the irregular shade is a digital camera 114 (see FIGS. 1 and 2) and an illuminance sensor 112 attached inside the module (FIG. 4a) can be applied.

5B is an illustration of a regular shade horizontally and vertically of the electric signboard, and the regular shade is a method of the illuminance sensor 112 attached to the digital camera 114 and the rim 102 of the electric signboard, regardless of the width or length of the electric signboard. It is desirable to adopt.

6A and 6B are exemplary views to which the method of implementing the correction of an electric signboard according to the present invention is applied.

As shown in FIG. 6A, it shows the state of the signboard when the upper part of the signboard 100 is shaded by the upper structure and the lower part is directly illuminated by sunlight.The upper shadow looks relatively bright, and the part exposed to the lower sunlight is It looks faint. Assuming that the state of the electronic board is corrected, FIG. 6B describes the operating principle corrected by the operating computer correction logic unit 150.

Since the image in the shaded area of the electric signboard looks bright, the image data is corrected relatively dark, and in the sunlight part, the image is relatively low in brightness due to low contrast, so the specific gravity of the image data must be increased.

Therefore, based on the information received from the illuminance sensor unit 110 (see Fig. 1), a correction data image (also expressed as a mask) imaged as a bmp file is created and multiplied by 1:1 between the source image and pixels to correct the source image. You just need to display it on the electronic board. In order to perform this function of the present invention, the brightness of the electric signboard should be usually lower than the maximum design value. In general, the LED individual correction is adjusted to the average level by lowering the LED brighter than the reference value, so that the electric signboard performing the general LED individual correction is lower than the maximum brightness. Corrected and used.

If the daily set signboard sets 75% of the maximum brightness, the shaded part of the correction data image (mask) has a correction factor of 0.75 or less, and the sunlight part must be 0.75 or more, and usually 5% or more. There is.

Therefore, it is advisable to program so that the constant can be changed and set as it depends on the intensity and latitude of sunlight. The correction method is not limited to the above example, and only the shaded portion may be darkened or only the sunlight portion may be brightened.

7 is a flow chart of the operating computer correction logic unit shown in FIG.

As shown in the figure, by receiving digital illuminance data from the digital camera 114 (see FIGS. 1 and 2) or the illuminance sensor 112 installed in multiple stages, it is determined whether the illuminance for each location is uniform. Since it is not in a shade state, it is not necessary to apply the functions of the present invention, so that the electronic signboard is operated in a normal state, and when the illuminance is low, the entire electronic signboard is operated in a dark night mode (S1 to S5).

Contrary to the above, when the illuminance is not uniform, the sun's altitude is low and the light appears to be the most dim when shining on the LED surface, and the correction factor should be increased to make the LED brightness relatively bright.

To this end, analyze the illumination data such as x,y position of the illumination sensor (S3a) and the intensity of sunlight (S4a) to determine the correction level (S5a) and generate a correction data image (S6a). Data is stored in the memory according to the and time information (S7a) (S8a), and image data correction (S9a) is performed. It is also desirable to visually determine the correction level and input a correction constant.

When data is accumulated to a certain extent, correction data images are generated by calculation, and automatic execution is possible. If the board is flat, calculation can be performed by the orientation of the board and the hardness of the installation point.

Although the technical idea of the present disclosure has been described with reference to some embodiments and examples shown in the accompanying drawings above, the scope of the present disclosure does not depart from the technical idea and scope of the present disclosure that can be understood by those of ordinary skill in the art to which the present disclosure belongs. It will be appreciated that various substitutions, modifications and alterations may be made in In addition, such substitutions, modifications and changes are to be considered as falling within the scope of the appended claims.

Advantageous Effects of Invention According to the present invention, the usefulness of enhancing visibility is provided so that an image of an electric signboard can always be clearly seen without interference by sunlight or shade.

100: electronic board
110: illuminance sensor unit
112: illuminance sensor
114: digital camera
130: illuminance calculation unit
132: illuminance sensor position calculation logic
134: digital conversion logic
150: correction logic unit of the electronic display operating computer
151: illuminance analysis logic
152: electronic board position illuminance calculation logic
153: date, time logging logic
154: correction data image generation logic
155: data storage logic
156: video signal correction logic

Claims (6)

An illuminance sensor unit composed of a digital camera or illuminance sensor that generates basic data on whether sunlight is shining or shade on the front of the electric signboard;
When the data input from the illuminance sensor unit is data from the illuminance sensor, the position of each illuminance sensor is identified so that the positions of the sunlight and shade portions of the electric signboard can be estimated, and the analog signal output from the illuminance sensor is obtained. An illuminance calculation unit that converts digital signals for communication with an electronic board operating computer; And
Based on data input from the illuminance calculator or the digital camera, the illuminance value input from the illuminance sensor is an illuminance deviation value, and the photographed image received from the digital camera is a luminance data value for each pixel, sunlight and sunlight Sunlight, shade, and blur based on data input from the illuminance sensor or digital camera, which calculates correction data to improve the visibility of the electric signboard image by determining the part and shade, and corrects the source image to be displayed on the signboard. And illuminance analysis logic to determine whether to perform correction by grasping the night state, and calculating the position of the shade by adaptively matching the coordinates of the displayed image of the operating computer monitor of the electronic board and the coordinates of the electronic board in a 1:1 manner. Contrary to the date and time logging logic that inserts date and time information into the logic and shade location information, and the received data, the shaded portion lowers the data luminance and the sunlight portion increases to create a bmp-shaped correction data image. Operation computer correction logic unit consisting of data storage logic to store shade information with the date and time logged and use it as big data, and image signal correction logic to generate the corrected image to be displayed by overlapping the source image with the correction data image ; Shading compensation according to the sun angle and the shadow according to the surrounding environment of the electronic sign including a LED sign. The method of claim 1,
The illuminance calculation unit uses an illuminance sensor position calculation logic to determine the position of each illuminance sensor and an analog signal output from the illuminance sensor to be digital for communication with an operating computer so that the position of the sunlight and shade of the electric signboard can be estimated. It consists of a digital conversion logic that converts to a shadow according to the surrounding environment of the signboard and a shadow compensation LED display according to the sun angle. delete The method of claim 1,
The digital camera or illuminance sensor is used to detect sunlight and shade, but irregular shades are attached to the digital camera or by the illuminance sensor attached to the front of the LED module, and regular shades are attached to the edge of the signboard in the form of x, y coordinates. An LED display that compensates for shadows according to the sun angle and shadows according to the surrounding environment of the electric signboard, characterized in that it is detected by an illuminance sensor. The method of claim 1,
The image signal correction corrects the image data dark for the image in the shaded part of the electric signboard, while the image data for the sunlight part corrects the image data brightly, but has a variable constant that can be changed and set according to the intensity of sunlight and the latitude of the place where the signboard is installed. A shadow compensation LED display according to the angle of the sun and the shadow according to the surrounding environment of the electronic display, which comprises a program. The method of claim 1,
Shading compensation according to the shade according to the surrounding environment and the sun angle of the electric signboard that can be used as big data on the shade from the next year when the surrounding environment is the same by storing the shade data by date and time in the data storage logic.

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