CN102693698A - Automatic adjusting method and automatic adjusting system for brightness of outdoor LED (Light-Emitting Diode) display screen based on environmental light change - Google Patents
Automatic adjusting method and automatic adjusting system for brightness of outdoor LED (Light-Emitting Diode) display screen based on environmental light change Download PDFInfo
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Abstract
The invention discloses an automatic adjusting method and an automatic adjusting system for the brightness of an outdoor LED (Light-Emitting Diode) display screen based on an environmental light change. The method is characterized by comprising the steps that: an image collection module collects images in a surrounding of the LED display screen through a camera according to a pre-set time interval, and sends the images to an image processing module; the image processing module receives image data sent by the image processing module, processes the image data, extracts surrounding brightness data and sends the surrounding brightness data to a brightness converting table; the brightness converting table receives the surrounding brightness data sent by the image processing module, and outputs corresponding brightness control data of the LED display screen to an LED display screen control system; and an LED display screen control module receives the LED display screen brightness control data sent by the brightness converting table and changes a pulse width, so as to adjust the brightness of the LED display screen..
Description
Technical field
The present invention relates to LED display brightness regulation field, specifically, relate to a kind of outdoor LED display screen automatic brightness adjustment method and system that change based on surround lighting.
Background technology
Along with the continuous development of LED technology, the application of outdoor LED display screen more and more widely relates generally to the information propagating of public good propaganda, media advertisement, corporate image and public place etc.Compare the following advantage of LED display with traditional canvas advertisement, lamp box advertisement:
1) big picture, visual impression is strong, brightness is high, the life-span is long, is easy to attract people's notice.
2) content update is fast convenient, and content type is abundant, comprises special topic, special column, variety, animation, radio play, TV play, breaks for commercialsy in the program gap.
3) outward appearance is novel unique, promotes city image, enriches resident's culture life.
The unique display styles of LED display makes it obtain using widely.LED display is to be made up of series of LED (being light emitting diode) dot matrix, the main at present LED that uses three kinds of colors of red, green, blue.Just be called double-colored screen or color line screen to the red and green display screen of forming a pixel of putting together; Just be called full-color screen to three kinds of pixels of red, green, blue display screen of forming a pixel of putting together.The pixel diameter of outdoor LED display screen and pel spacing do not have very unified standard at present, by nearly 1024 points of every square meter pixel quantity, 1600 points, and 2000 points, 2500 points, plurality of specifications such as 4096.
With the full-color LED display screen example of 2000 of every square meters, total 2000*3=6000 LED, each pixel of the display screen that has has 4 LED, and then every square meter has 8000 LED.The working current of each LED is 0.02A, and WV is 5V, its every square meter power consumption:
0.02A?*?5V?*?6000?=?600W
It is thus clear that the power consumption of LED display is very huge, large-scale promotion application must be considered the problem that how reduces power consumption.The brightness of LED is by the voltage at LED two ends and the size of current decision of flowing through LED.The method of common adjusting LED display brightness has two kinds: regulate electric current and width modulation (PWM).Because width modulation has greater flexibility, and be suitable for digital controlly, use more.
In addition, different time and place, the brightness of surround lighting changes greatly, if the broadcast brightness of LED display will cause light pollution to human eye greater than ambient brightness 60%, makes human eye incompatible.Therefore, design LED display automatic brightness-regulating system is very important.
Summary of the invention
The present invention is directed to above problem, propose a kind of outdoor LED display screen automatic brightness adjustment method and system that change based on surround lighting.
The present invention adopts following technological means to realize goal of the invention:
A kind of outdoor LED display screen automatic brightness adjustment method that changes based on surround lighting is characterized in that, comprises the steps:
(1) image capture module is according to the time interval of setting, and through the image of camera collection LED display surrounding environment, and image sent to image processing module;
(2) image processing module receives the view data that image capture module sends, and view data is handled, and extracts the environment bright degrees of data, and the environment bright degrees of data is sent to the brightness transition table;
(3) the brightness transition table receives the environment bright degrees of data that image processing module sends, and the LED display luminance control data of output correspondence is to the LED display control system;
(4) the LED display control module receives the LED display luminance control data that the brightness transition table sends, and changes pulse width, thereby regulates the brightness of LED display.
As the further qualification to the present technique scheme, said step (2) comprises the steps:
(2.1) luminance graph generates: change into luminance picture to coloured image, coloured image is made up of three kinds of colors of red, green, blue, according to the formula of these three kinds of color calculation luminance graphs is:
Y
Brightness=0.299*R+0.587*G+0.114*B
Wherein, R represents the pixel value of red color, and G represents green color pixel value, and B represents blue color pixel value;
(2.2) brightness is extracted: calculate the average gray value of luminance picture, concrete formula is following:
Y
On average=(all pixel value sums in the luminance graph)/pixel number
Promptly obtain the current environmental light brightness size;
A kind of outdoor LED display screen automatic brightness-regulating system that changes based on surround lighting is characterized in that, comprising:
Camera: the image of gathering the LED display surrounding environment;
Image capture module:,, and image sent to image processing module through the image of camera collection LED display surrounding environment according to the time interval of setting;
Image processing module: receive the view data that image capture module sends, view data is handled, extract the environment bright degrees of data, and the environment bright degrees of data is sent to the brightness transition table;
The brightness transition table: receive the environment bright degrees of data that image processing module sends, the LED display luminance control data of output correspondence is to the LED display control module;
LED display control module: receive the LED display luminance control data that the brightness transition table sends, change pulse width, thereby regulate the brightness of LED display.
As the further qualification to the present technique scheme, said image processing module comprises:
The luminance graph generation unit: change into luminance picture to coloured image, coloured image is made up of three kinds of colors of red, green, blue, according to the formula of these three kinds of color calculation luminance graphs is:
Y
Brightness=0.299*R+0.587*G+0.114*B
R represents the pixel value of red color, and G represents green color pixel value, and B represents blue color pixel value; The brightness extraction unit: calculate the average gray value of luminance picture, concrete formula is following:
Y
On averageAll pixel value sum/pixel numbers in the=luminance graph
Promptly obtain the current environmental light brightness size.
Compared with prior art; Advantage of the present invention and good effect are: the light pollution problem that the present invention is directed to outdoor LED display screen power hungry problem and LED display; Propose a kind of image processing techniques of passing through and gathered environmental light brightness, regulated the solution of LED display brightness then according to environmental light brightness, can greatly reduce the power consumption of LED display; Adapt to various Changes in weather, and can not cause light pollution.
Description of drawings
Fig. 1 is the system block diagram of the preferred embodiment of the present invention.
Fig. 2 is the product process figure of luminance graph in the image processing module of patent of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment the present invention is made detailed description further.
Referring to Fig. 1, Fig. 2, the present invention includes following steps:
(1) image capture module is according to the time interval of setting, and through the image of camera collection LED display surrounding environment, and image sent to image processing module;
(2) image processing module receives the view data that image capture module sends, and view data is handled, and extracts the environment bright degrees of data, and the environment bright degrees of data is sent to the brightness transition table;
(3) the brightness transition table receives the environment bright degrees of data that image processing module sends, and the LED display luminance control data of output correspondence is to the LED display control system;
(4) the LED display control module receives the LED display luminance control data that the brightness transition table sends, and changes pulse width, thereby regulates the brightness of LED display.
Said step (2) comprises the steps:
(2.1) luminance graph generates: change into luminance picture to coloured image, coloured image is made up of three kinds of colors of red, green, blue, according to the formula of these three kinds of color calculation luminance graphs is:
Y
Brightness=0.299*R+0.587*G+0.114*B
Wherein, R represents the pixel value of red color, and G represents green color pixel value, and B represents blue color pixel value;
(2.2) brightness is extracted: calculate the average gray value of luminance picture, concrete formula is following:
Y
On averageAll pixel value sum/pixel numbers in the=luminance graph
Promptly obtain the current environmental light brightness size;
A kind of outdoor LED display screen automatic brightness-regulating system that changes based on surround lighting comprises:
Camera: the image of gathering the LED display surrounding environment;
Image capture module:,, and image sent to image processing module through the image of camera collection LED display surrounding environment according to the time interval of setting;
Image processing module: receive the view data that image capture module sends, view data is handled, extract the environment bright degrees of data, and the environment bright degrees of data is sent to the brightness transition table;
The brightness transition table: receive the environment bright degrees of data that image processing module sends, the LED display luminance control data of output correspondence is to the LED display control module; Its practical implementation method:
According to the brightness regulation grade of LED display, the full luminance space is divided.
For example,, have only three kinds of brightness sizes, i.e. low-light level, normal, high brightness to the LED display of three grades of adjustings.Therefore, the corresponding brightness conversion table has only three kinds of outputs, and brightness transition table input data are 0-255, and 256 inputs are arranged.The effect of brightness transition table is exactly input data in 256 are corresponded in these three kinds of outputs.
After accomplishing brightness transition, the brightness transition table output data of correspondence is sent to LED display brilliance control module;
The LED display control module: receive the LED display luminance control data that the brightness transition table sends, the corresponding pulse width that changes, thereby the brightness of adjusting LED display, brightness is big more, and pulse width is wide more; Brightness is more little, and pulse width is more little.
Said image processing module comprises:
1) luminance graph generation unit: change into luminance picture to coloured image, coloured image is made up of three kinds of colors of red, green, blue, according to the formula of these three kinds of color calculation luminance graphs is:
Y
Brightness=0.299*R+0.587*G+0.114*B
Wherein, R represents the pixel value of red color, and G represents green color pixel value, and B represents blue color pixel value;
2) brightness extraction unit: calculate the average gray value of luminance picture, concrete formula is following:
Y
On averageAll pixel value sum/pixel numbers in the=luminance graph
Promptly obtain the current environmental light brightness size.
Certainly, above-mentioned explanation is not a limitation of the present invention, and the present invention also is not limited only to above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also belong to protection scope of the present invention.
Claims (3)
1. an outdoor LED display screen automatic brightness adjustment method that changes based on surround lighting is characterized in that, comprises the steps:
(1) image capture module is according to the time interval of setting, and through the image of camera collection LED display surrounding environment, and image sent to image processing module;
(2) image processing module receives the view data that image capture module sends, and view data is handled, and extracts the environment bright degrees of data, and the environment bright degrees of data is sent to the brightness transition table;
(3) the brightness transition table receives the environment bright degrees of data that image processing module sends, and the LED display luminance control data of output correspondence is to the LED display control system;
(4) the LED display control module receives the LED display luminance control data that the brightness transition table sends, and changes pulse width, thereby regulates the brightness of LED display.
2. according to the said outdoor LED display screen automatic brightness adjustment method that changes based on surround lighting of claim 1, it is characterized in that said step (2) comprises the steps:
(2.1) luminance graph generates: change into luminance picture to coloured image, coloured image is made up of three kinds of colors of red, green, blue, according to the formula of these three kinds of color calculation luminance pictures is:
Y
Brightness=0.299*R+0.587*G+0.114*B
R represents the pixel value of red color, and G represents green color pixel value, and B represents blue color pixel value; (2.2) brightness is extracted: calculate the average gray value of luminance picture, concrete formula is following:
Y
On average=(all pixel value sums in the luminance graph)/pixel number
Promptly obtain the current environmental light brightness size;
A kind of outdoor LED display screen automatic brightness-regulating system that changes based on surround lighting is characterized in that, comprising:
Camera: the image of gathering the LED display surrounding environment;
Image capture module:,, and image sent to image processing module through the image of camera collection LED display surrounding environment according to the time interval of setting;
Image processing module: receive the view data that image capture module sends, view data is handled, extract the environment bright degrees of data, and the environment bright degrees of data is sent to the brightness transition table;
The brightness transition table: receive the environment bright degrees of data that image processing module sends, the LED display luminance control data of output correspondence is to the LED display control module;
LED display control module: receive the LED display luminance control data that the brightness transition table sends, change pulse width, thereby regulate the brightness of LED display.
3. the outdoor LED display screen automatic brightness-regulating system that changes based on surround lighting according to claim 3 is characterized in that said image processing module comprises:
The luminance graph generation unit: change into luminance picture to coloured image, coloured image is made up of three kinds of colors of red, green, blue, according to the formula of these three kinds of color calculation luminance graphs is:
Y (brightness)=0.299*R+0.587*G+0.114*B
Wherein, R represents the pixel value of red color, and G represents green color pixel value, and B represents blue color pixel value;
The brightness extraction unit: calculate the average gray value of luminance picture, concrete formula is following:
Y
On average=(all pixel value sums in the luminance graph)/pixel number
Promptly obtain the current environmental light brightness size.
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| CN103247260A (en) * | 2013-04-19 | 2013-08-14 | 深圳市联建光电股份有限公司 | Automatic regulation system and method for brightness of LED display screen |
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| CN104777973A (en) * | 2014-01-14 | 2015-07-15 | 腾讯科技（深圳）有限公司 | Interface display control method and device |
| CN105869604A (en) * | 2015-12-03 | 2016-08-17 | 乐视致新电子科技（天津）有限公司 | Method and device for regulating display brightness of screen and electronic device |
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