CN116634624A - Illumination control method and device for transparent screen display cabinet - Google Patents

Illumination control method and device for transparent screen display cabinet Download PDF

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Publication number
CN116634624A
CN116634624A CN202310900589.XA CN202310900589A CN116634624A CN 116634624 A CN116634624 A CN 116634624A CN 202310900589 A CN202310900589 A CN 202310900589A CN 116634624 A CN116634624 A CN 116634624A
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Prior art keywords
area
brightness
display
projection
determining
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CN202310900589.XA
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CN116634624B (en
Inventor
石继元
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Zhuhai Zhongxucheng Technology Co ltd
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Zhuhai Zhongxucheng Technology Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/115—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings
    • H05B47/125—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings by using cameras
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

The invention relates to the technical field of illumination, in particular to an illumination control method and device of a transparent screen display cabinet. The method comprises the following steps: recognizing the faces of the images acquired by the cameras, and respectively determining the center points of two eyes in the faces; determining the three-dimensional positions of two center points in a three-dimensional coordinate system; for each center point, taking the three-dimensional position of the center point as a starting point, connecting an edge pixel of a display area by a ray and extending the ray to a backlight plate of a display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area; determining a non-overlapping area and an overlapping area of a projection area obtained by the two center points; obtaining an ambient brightness value and setting the brightness of a backlight plate; calculating the difference between the brightness of the backlight plate and the average brightness of the display area; adjusting the brightness of the projection area; the brightness of the non-overlapping area and the overlapping area of the projection area is reduced. The invention solves the problem that the illumination in the transparent screen display cabinet needs to be regulated.

Description

Illumination control method and device for transparent screen display cabinet
Technical Field
The invention relates to the technical field of illumination, in particular to an illumination control method and device of a transparent screen display cabinet.
Background
The transparent screen showcase is also called a transparent showcase, and is a high-tech product integrating microelectronic technology, computer technology, photoelectronic technology and information processing technology. The display device mainly comprises a transparent display screen, an adapter power supply, a playing box integrating a driving module and a power supply module and the like. The transparent screen showcase can display contents such as characters, pictures and videos on the screen, and meanwhile, as the screen is transparent, a viewer can see articles in the showcase through the screen, and a unique display effect is realized.
Because the principle of transparent display screen is limited, transparent display screen can't provide very high luminance, needs backlight to supplement the illumination, and transparent screen display cabinet generally is applied to places such as shop, exhibition hall, museum, requires transparent screen display cabinet to be in the highlight state moreover. At present, a lighting module is arranged in a transparent screen display cabinet, and a backlight plate is arranged by adopting an LED lamp group to provide backlight for the transparent screen.
In this way, if the light of the backlight plate is stronger, the light can pass through the transparent display screen to enter human eyes, so that the observation of the human eyes on the content on the transparent display screen is affected; when the light is not strong enough, the inside of the cabinet is darker, and the watching is influenced, so how to adjust the illumination in the transparent screen display cabinet is a problem to be solved.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, apparatus and computer device for controlling illumination of a transparent screen display case.
The embodiment of the invention is realized in such a way that the illumination control method of the transparent screen display cabinet comprises the following steps:
identifying whether the image acquired by the camera shows a human face or not, if so, respectively determining the plane positions of the center points of two eyes in the human face;
establishing a three-dimensional coordinate system, and determining three-dimensional positions of two center points in the three-dimensional coordinate system;
for each center point, taking the three-dimensional position of the center point as a starting point, connecting an edge pixel of a display area of the display cabinet with a ray and extending the ray to a backlight plate of the display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area;
determining a non-overlapping area and an overlapping area of a projection area obtained by the two center points;
acquiring an ambient brightness value, and setting the brightness of the backlight plate according to a set comparison table by the ambient brightness value;
calculating the difference between the brightness of the backlight plate and the average brightness of the display area;
adjusting the brightness of the projection area according to the positive and negative of the difference value;
respectively reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the difference value;
wherein, the camera has two, sets up in the place ahead of show cupboard.
In one embodiment, the present invention provides a lighting control device for a transparent screen display case, the lighting control device for a transparent screen display case comprising:
the eye recognition module is used for recognizing whether the image acquired by the camera has a human face or not, and if so, the plane positions of the center points of the two eyes in the human face are respectively determined;
the position determining module is used for establishing a three-dimensional coordinate system, and determining the three-dimensional positions of the two center points in the three-dimensional coordinate system;
the projection area module is used for connecting the edge pixels of the display area of the display cabinet with a ray for each center point by taking the three-dimensional position of the center point as a starting point and extending the ray to the backlight plate of the display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area;
the overlapping module is used for determining an overlapping area and a non-overlapping area of the projection area obtained by the two center points;
the brightness setting module is used for obtaining an ambient brightness value, and setting the brightness of the backlight plate according to a set comparison table by the ambient brightness value;
the calculating difference module is used for calculating the difference between the brightness of the backlight plate and the average brightness of the display area;
the brightness adjusting module is used for adjusting the brightness of the projection area according to the positive and negative of the difference value;
and the brightness reducing module is used for respectively reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the difference value.
According to the illumination control method for the transparent screen display cabinet, provided by the embodiment of the invention, the projection area of the eyes on the backlight plate for the display area of the display cabinet in the three-dimensional coordinate system is obtained by identifying the eyes in the image acquired by the camera, and the brightness of the LED lamp corresponding to the projection area is adjusted according to the set brightness of the backlight plate and the average brightness difference of the display area.
Drawings
FIG. 1 is a flow chart of a method of controlling illumination of a transparent screen display case in one embodiment;
FIG. 2 is a schematic diagram of an image captured by a camera in one embodiment;
FIG. 3 is a three-dimensional schematic of the relative orientation of a camera and an eye in one embodiment;
FIG. 4 is a schematic view of an eye and a display area in one embodiment;
FIG. 5 is a block diagram of the lighting control device of the transparent screen display case in one embodiment;
FIG. 6 is a block diagram of the internal architecture of a computer device in one embodiment.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms unless otherwise specified. These terms are only used to distinguish one element from another element. For example, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script, without departing from the scope of this disclosure.
As shown in fig. 1, in one embodiment, a method for controlling illumination of a transparent screen display cabinet is provided, which specifically includes the following steps:
identifying whether the image acquired by the camera shows a human face or not, if so, respectively determining the plane positions of the center points of two eyes in the human face;
establishing a three-dimensional coordinate system, and determining three-dimensional positions of two center points in the three-dimensional coordinate system;
for each center point, taking the three-dimensional position of the center point as a starting point, connecting an edge pixel of a display area of the display cabinet with a ray and extending the ray to a backlight plate of the display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area;
determining a non-overlapping area and an overlapping area of a projection area obtained by the two center points;
acquiring an ambient brightness value, and setting the brightness of the backlight plate according to a set comparison table by the ambient brightness value;
calculating the difference between the brightness of the backlight plate and the average brightness of the display area;
adjusting the brightness of the projection area according to the positive and negative of the difference value;
respectively reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the difference value;
wherein, the camera has two, sets up in the place ahead of show cupboard.
In this embodiment, the face recognition technology is a prior art, and can recognize the face of the image acquired by the camera.
In this embodiment, the eye is an area composed of a plurality of pixels on the image, and for convenience of positioning and calculation, the center point of the eye is selected as the positioning point of the eye.
In this embodiment, the plane position refers to the lateral distance and the longitudinal distance of the eyes from the center of the image on the image acquired by the camera.
In the present embodiment, the three-dimensional position refers to a spatial coordinate in a three-dimensional coordinate system.
In this embodiment, there are a number of ways to determine the edge pixels of the display area of the display case, such as image edge recognition techniques.
In this embodiment, the display area may be one continuous area or may be a plurality of separate areas.
In this embodiment, the resulting projected area may be one continuous area, or multiple separate areas for each center point, depending on the display area.
In this embodiment, the projection area obtained by one center point does not have a coincidence area.
In this embodiment, for the backlight plane, there may or may not be a overlapping area of the two projection areas obtained by the two center points.
In this embodiment, the ambient brightness value may be obtained by a hardware device such as a sensor.
In this embodiment, the set reference table is a reference table of the ambient temperature and the brightness of the backlight panel set by the user.
In the present embodiment, if there are a plurality of display areas, the average luminance of each display area is calculated separately, and the difference between the luminance of the background plate and the average luminance of each display area is calculated separately.
In this embodiment, the brightness of the projection area is adjusted according to the positive and negative of the difference value to ensure that the brightness of the projection area is lower than the average brightness of the corresponding display area.
In this embodiment, the brightness of the non-overlapping area and the overlapping area of the projection area is reduced, so that the light transmitted through the transparent display screen is reduced, the display screen is clearer, and meanwhile, a contrast of light difference is formed between the display screen and the area outside the display screen of the transparent display screen.
According to the illumination control method for the transparent screen display cabinet, provided by the embodiment of the invention, the projection area of the eyes on the backlight plate for the display area of the display cabinet in the three-dimensional coordinate system is obtained by identifying the eyes in the image acquired by the camera, and the brightness of the LED lamp corresponding to the projection area is adjusted according to the set brightness of the backlight plate and the average brightness difference of the display area.
As shown in fig. 2, in one embodiment, the determining the plane positions of the center points of the two eyes in the face respectively includes:
for images acquired by any one camera, respectively identifying two eyes in a face;
for any one eye, a lateral distance and a longitudinal distance are determined for the center point of the eye from the center of the acquired image.
In this embodiment, the eye recognition technology is a prior art technology, and can recognize the eye region of a face.
In this embodiment, the lateral distance refers to a distance in the horizontal direction of the center point of the eye at the midpoint of the image.
In this embodiment, the longitudinal distance refers to a distance in the vertical direction of the center point of the eye at the midpoint of the image.
In this embodiment, as shown in fig. 2, assuming that an image acquired by a camera is located in a box and a small black dot in the middle is the center of the image, a lateral distance and a longitudinal distance that the center point of the eye deviates from the center of the acquired image can be determined according to the acquired image.
As shown in fig. 3, in one embodiment, the establishing a three-dimensional coordinate system in which the three-dimensional positions of the two center points are determined includes:
a three-dimensional coordinate system is established by taking one vertex of the display cabinet as an origin, and the directions of length, width and height are respectively x-axis, y-axis and z-axis directions;
determining three-dimensional positions of the two cameras;
for any one eye, obtaining a horizontal deflection angle with any one camera according to the transverse distance of the center point of the eye in the image acquired by the camera;
obtaining a vertical deflection angle with the camera according to the longitudinal distance of the center point of the eye in the image acquired by the camera;
obtaining the relative direction between the center point of the eye and the camera according to the horizontal deflection angle and the vertical deflection angle;
the three-dimensional position of the center point of the eye is obtained from the opposite directions of the center point of the eye and the two cameras.
In the present embodiment, as shown in FIG. 3, O l And O r Representing two cameras, f being the ray along the Y-axis at the center of the camera, and the square being the image acquired by the camera, (c) x ，c y ) For the centre of the acquired image, p l And p r For the position of the eye in the images acquired by the two cameras, for O l Camera head according to p l The horizontal offset angle is determined by the lateral distance on the acquired image, for example, the horizontal view angle of the camera is 120 DEG, the length of the acquired image is 120mm, p l At (c) x ，c y ) And distance (c) x ，c y ) The horizontal offset angle is 30 deg. based on the ratio of the horizontal distance to the length of the image, which is 30 mm.
In this embodiment, as shown in fig. 3, the relative direction between the center point of the eye and the camera, i.e. line segment O, is determined by the horizontal deflection angle and the vertical deflection angle l p l Is a direction of (2).
In the present embodiment, as shown in FIG. 3, line segment O l p l And line segment O r p r The intersection is at point P, namely the point P is the three-dimensional position of the eyes in the three-dimensional coordinate system.
In one embodiment, as shown in fig. 4, for each center point, starting from the three-dimensional position of the center point, a ray is connected to an edge pixel of the display area of the display case and extends onto the backlight board of the display case, so that the ray moves along the edge of the display area to obtain a projection area of the display area, and the method includes:
determining the three-dimensional positions of all edge pixels of a display area of the display case;
for any one eye, connecting the three-dimensional position of any one edge pixel with a ray by taking the three-dimensional position of the center point of the eye as a starting point, and extending the three-dimensional position to the backlight plate plane of the display cabinet to obtain the three-dimensional position of the projection of the edge pixel on the backlight plate plane;
the rays are respectively connected with all edge pixels, and the three-dimensional positions of projection of all edge pixels on the plane of the backlight plate are obtained;
the area enclosed by the three-dimensional position of projection of all edge pixels on the backlight plane is determined as the projection area of the display area.
In the present embodiment, S as shown in FIG. 4 1 S is the display area 2 Is a transparent display screen S 3 S is the projection area of the display area on the backlight plate 4 Is the plane of the backlight plate, P is the three-dimensional position of eyes, and P and S 1 Extends to S after all points on the edge of (C) are connected 4 On the surface, a pattern is obtained, and the area surrounded by the pattern is S 3 。
In one embodiment, the determining the three-dimensional positions of all edge pixels of the display area of the display case includes:
s201, determining all pixels in color development states of a display screen by taking a transparent display screen as a plane;
s202, selecting a pixel in a color development state, and setting a nine-grid of 3*3 by taking the pixel in the color development state as the center;
s203, judging whether the pixels in the grids are all pixels in a color development state, if so, the selected pixels are not edge pixels, and if not, the selected pixels are edge pixels;
s204, executing S202-S203 on all pixels in the color development state, and determining all edge pixels;
s205, determining three-dimensional positions of all edge pixels of a display area of the display cabinet in a three-dimensional coordinate system.
In this embodiment, the edge pixels are pixels having transparent states among pixels surrounding one circle of any one of the color development pixels, and the nine squares of 3*3 include the center pixel and pixels surrounding one circle of the center pixel, so the nine squares of 3*3 are used for the judgment.
In this embodiment, the three-dimensional coordinate system is established by taking a vertex of the display cabinet as an origin, and directions of length, width and height are x-axis, y-axis and z-axis directions respectively, so that for the transparent display screen, the three-dimensional position of each pixel is determined, and only the edge pixel needs to be found out to determine the three-dimensional position.
In one embodiment, the determining the non-overlapping region and the overlapping region of the projection region resulting from the two center points includes:
determining an LED lamp corresponding to a projection area on a plane of a backlight plate;
judging the number of projection areas falling in the area of any LED lamp;
if only one projection area falls in the area of the LED lamp, the LED lamp is marked as M;
if two projection areas fall in the area of the LED lamp, the LED lamp is marked as C;
all the areas formed by M are marked as non-overlapping areas of the projection areas;
all the areas of C are denoted as overlapping areas of the projection areas.
In this embodiment, the area of the LED lamp refers to the area of the light emitting plane of the LED, and for the backlight, the LED lamp is composed of a plurality of LED lamps, and in fact, the LED lamp is not a point, but has a specific light emitting plane, and changing the brightness of the LED is changing the brightness of the whole light emitting plane.
In this embodiment, if the projection area falls within the area of any one of the LED lamps, the LED lamp is considered to be one of the LED lamps whose projection area corresponds to the backlight plane.
In this embodiment, for the LED lamp whose projection area corresponds to the plane of the backlight plate, there are only two possibilities, one is that one projection area falls within the area of the LED lamp, and the other is that both projection areas fall within the area of the LED lamp.
In one embodiment, the calculating the difference between the backlight brightness and the average brightness of the display area includes:
from the following componentsObtaining the brightness of each pixel of the display area;
from the following componentsObtaining the average brightness l of the display area;
from the following componentsObtaining a difference value;
wherein L is i Is the brightness of any one pixel in the display area, n is the number of pixels in the display area, A 1 Is the backlight brightness.
In the present embodiment, the RGB color space is based on three basic colors of R (Red), G (Green) and B (Blue), and is superimposed to different degrees to generate rich and wide colors, so commonly called as three primary color mode, the RGB color space is suitable for display system but not suitable for image processing, the YIQ color space belongs to NTSC system, the luminance components in the image can be separated and extracted, and the YIQ color space and the RGB color space are in linear transformation relation, so that the color information is obtained byThe brightness of the pixel can be obtained.
In one embodiment, the adjusting the brightness of the projection area according to the positive and negative of the difference value includes:
judging whether the difference value is more than or equal to 0;
if yes, setting an adjustment value t of the projection area to be 0;
if not, byObtaining an adjustment value t of a projection area;
according toSetting the brightness of the LED lamp corresponding to the projection area;
wherein A is 1 Is a backlight plateDegree, H is the difference.
In this embodiment, setting the brightness of the LED lamps corresponding to the projection area means that all the LED lamps corresponding to the projection area are set identically.
In this embodiment, since the LED lamps corresponding to the projection area are all of the same brightness, the brightness essence of the projection area is the brightness of the LED lamps corresponding to the projection area.
In this embodiment, the luminance of the adjusted projection area is lower than the average luminance of the display area, and the difference is the absolute value of H, for example, if the average luminance of the display area is 20 and the backlight luminance is 15, the difference H is 5 and t is 0, according toThe brightness of the LED lamp corresponding to the projection area is 15, if the average brightness of the display area is 15 and the brightness of the backlight plate is 20, the difference H is-5, t is 10, and the brightness is calculated according to +.>The brightness of the LED lamp corresponding to the projection area is 10, and the difference between the average brightness of the display area and the brightness of the LED lamp corresponding to the adjusted projection area is 5.
In one embodiment, the reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the magnitude of the difference value includes:
from the following componentsObtaining a first reduction value E;
from the following componentsObtaining a second reduction value F;
according toSetting the brightness of the LED lamp corresponding to the non-overlapping area of the projection area;
according toSetting projectionBrightness of the LED lamp corresponding to the overlapping area of the areas;
wherein a and b are set proportion values, H is a difference value, D is the actual distance between eyes and the center of the display cabinet, D is the set maximum distance between eyes and the center of the display cabinet, A 2 And the brightness of the LED lamp corresponding to the projection area.
In this embodiment, the larger a and b are, the larger E, F is, and the smaller the brightness of the LED corresponding to the projection area is, so the values of a and b depend on the requirements of the user for brightness.
In this embodiment, d may be obtained in a three-dimensional coordinate system.
In this embodiment, the maximum distance the display case allows the camera to recognize the face is the projection of D in the three-dimensional coordinate system on the Y-axis.
In this embodiment, in actual operation, the brightness of the LED lamp corresponding to the projection area may be reduced by E, and then the brightness of the LED lamp corresponding to the overlapping area may be reduced by F.
In this embodiment, the farther the eyes are from the center of the display case, the larger the ratio of D to D is, the larger E, F is, the smaller the brightness of the LED corresponding to the projection area is, which is the farther the eyes are from the center of the display case, the larger the brightness of the LED corresponding to the projection area is, the more light rays passing through the transparent display screen are, the more transparent the display area is, and the more blurred the image of the display area is seen, so when the eyes are far from the center of the display case, the brightness of the LED corresponding to the projection area is made smaller.
As shown in fig. 5, in one embodiment, there is provided a lighting control device of a transparent screen display cabinet, which may specifically include:
the eye recognition module is used for recognizing whether the image acquired by the camera has a human face or not, and if so, the plane positions of the center points of the two eyes in the human face are respectively determined;
the position determining module is used for establishing a three-dimensional coordinate system, and determining the three-dimensional positions of the two center points in the three-dimensional coordinate system;
the projection area module is used for connecting the edge pixels of the display area of the display cabinet with a ray for each center point by taking the three-dimensional position of the center point as a starting point and extending the ray to the backlight plate of the display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area;
the overlapping module is used for determining an overlapping area and a non-overlapping area of the projection area obtained by the two center points;
the brightness setting module is used for obtaining an ambient brightness value, and setting the brightness of the backlight plate according to a set comparison table by the ambient brightness value;
the calculating difference module is used for calculating the difference between the brightness of the backlight plate and the average brightness of the display area;
the brightness adjusting module is used for adjusting the brightness of the projection area according to the positive and negative of the difference value;
and the brightness reducing module is used for respectively reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the difference value.
In this embodiment, each module of the lighting control device of the transparent screen display cabinet is modularized in the method portion of the present invention, and for a specific explanation of each module, please refer to the corresponding content of the method portion of the present invention, the embodiments of the present invention are not described herein again.
FIG. 6 illustrates an internal block diagram of a computer device in one embodiment. As shown in fig. 6, the computer device includes a processor, a memory, a network interface, an input device, and a display screen connected by a system bus. The memory includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program, where the computer program when executed by the processor may cause the processor to implement the lighting control method of the transparent screen display cabinet provided by the embodiment of the present invention. The internal memory may also store a computer program, which when executed by the processor, causes the processor to execute the lighting control method of the transparent screen display cabinet provided by the embodiment of the invention. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 6 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, the lighting control apparatus of the transparent screen display case provided in the embodiment of the present invention may be implemented as a computer program, which may be executed on a computer device as shown in fig. 6. The memory of the computer device may store various program modules that make up the lighting control device of the transparent screen display case, such as the identify eyes module, determine position module, project area module, determine overlap module, set brightness module, calculate difference module, adjust brightness module, and decrease brightness module shown in fig. 5. The computer program of each program module causes the processor to carry out the steps of the lighting control method of the transparent screen display cabinet of each embodiment of the invention described in the specification.
For example, the computer device shown in fig. 6 may perform step S101 by identifying an eye module in the lighting control apparatus of the transparent screen display case as shown in fig. 5; the computer device may perform step S102 by determining a location module; the computer device may execute step S103 through the projection area module; the computer device may perform step S104 by determining a coincidence module; the computer device may execute step S105 by setting the brightness module; the computer device may execute step S106 by calculating a difference module; the computer device may execute step S107 by adjusting the brightness module; the computer device may perform step S108 by the brightness reduction module.
In one embodiment, a computer device is presented, the computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
identifying whether the image acquired by the camera shows a human face or not, if so, respectively determining the plane positions of the center points of two eyes in the human face;
establishing a three-dimensional coordinate system, and determining three-dimensional positions of two center points in the three-dimensional coordinate system;
for each center point, taking the three-dimensional position of the center point as a starting point, connecting an edge pixel of a display area of the display cabinet with a ray and extending the ray to a backlight plate of the display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area;
determining a non-overlapping area and an overlapping area of a projection area obtained by the two center points;
acquiring an ambient brightness value, and setting the brightness of the backlight plate according to a set comparison table by the ambient brightness value;
calculating the difference between the brightness of the backlight plate and the average brightness of the display area;
adjusting the brightness of the projection area according to the positive and negative of the difference value;
respectively reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the difference value;
wherein, the camera has two, sets up in the place ahead of show cupboard.
In one embodiment, a computer readable storage medium is provided, having a computer program stored thereon, which when executed by a processor causes the processor to perform the steps of:
identifying whether the image acquired by the camera shows a human face or not, if so, respectively determining the plane positions of the center points of two eyes in the human face;
establishing a three-dimensional coordinate system, and determining three-dimensional positions of two center points in the three-dimensional coordinate system;
for each center point, taking the three-dimensional position of the center point as a starting point, connecting an edge pixel of a display area of the display cabinet with a ray and extending the ray to a backlight plate of the display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area;
determining a non-overlapping area and an overlapping area of a projection area obtained by the two center points;
acquiring an ambient brightness value, and setting the brightness of the backlight plate according to a set comparison table by the ambient brightness value;
calculating the difference between the brightness of the backlight plate and the average brightness of the display area;
adjusting the brightness of the projection area according to the positive and negative of the difference value;
respectively reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the difference value;
wherein, the camera has two, sets up in the place ahead of show cupboard.
It should be understood that, although the steps in the flowcharts of the embodiments of the present invention are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in various embodiments may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
Those skilled in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by a computer program for instructing relevant hardware, where the program may be stored in a non-volatile computer readable storage medium, and where the program, when executed, may include processes in the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.

Claims (10)

1. The illumination control method of the transparent screen display cabinet is characterized by comprising the following steps of:
identifying whether the image acquired by the camera shows a human face or not, if so, respectively determining the plane positions of the center points of two eyes in the human face;
establishing a three-dimensional coordinate system, and determining three-dimensional positions of two center points in the three-dimensional coordinate system;
for each center point, taking the three-dimensional position of the center point as a starting point, connecting an edge pixel of a display area of the display cabinet with a ray and extending the ray to a backlight plate of the display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area;
determining a non-overlapping area and an overlapping area of a projection area obtained by the two center points;
acquiring an ambient brightness value, and setting the brightness of the backlight plate according to a set comparison table by the ambient brightness value;
calculating the difference between the brightness of the backlight plate and the average brightness of the display area;
adjusting the brightness of the projection area according to the positive and negative of the difference value;
respectively reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the difference value;
wherein, the camera has two, sets up in the place ahead of show cupboard.
2. The lighting control method of a transparent screen display case according to claim 1, wherein the determining the plane positions of the center points of the two eyes in the face, respectively, comprises:
for images acquired by any one camera, respectively identifying two eyes in a face;
for any one eye, a lateral distance and a longitudinal distance are determined for the center point of the eye from the center of the acquired image.
3. The method for controlling illumination of a transparent screen display case according to claim 2, wherein the establishing a three-dimensional coordinate system in which three-dimensional positions of two center points are determined includes:
a three-dimensional coordinate system is established by taking one vertex of the display cabinet as an origin, and the directions of length, width and height are respectively x-axis, y-axis and z-axis directions;
determining three-dimensional positions of the two cameras;
for any one eye, obtaining a horizontal deflection angle with any one camera according to the transverse distance of the center point of the eye in the image acquired by the camera;
obtaining a vertical deflection angle with the camera according to the longitudinal distance of the center point of the eye in the image acquired by the camera;
obtaining the relative direction between the center point of the eye and the camera according to the horizontal deflection angle and the vertical deflection angle;
the three-dimensional position of the center point of the eye is obtained from the opposite directions of the center point of the eye and the two cameras.
4. The method for controlling illumination of a transparent screen display case according to claim 1, wherein for each center point, starting from a three-dimensional position of the center point, a ray is connected to an edge pixel of a display area of the display case and extends onto a backlight plate of the display case, so that the ray moves along an edge of the display area to obtain a projection area of the display area, and the method comprises:
determining the three-dimensional positions of all edge pixels of a display area of the display case;
for any one eye, connecting the three-dimensional position of any one edge pixel with a ray by taking the three-dimensional position of the center point of the eye as a starting point, and extending the three-dimensional position to the backlight plate plane of the display cabinet to obtain the three-dimensional position of the projection of the edge pixel on the backlight plate plane;
the rays are respectively connected with all edge pixels, and the three-dimensional positions of projection of all edge pixels on the plane of the backlight plate are obtained;
the area enclosed by the three-dimensional position of projection of all edge pixels on the backlight plane is determined as the projection area of the display area.
5. The method of claim 4, wherein determining the three-dimensional positions of all edge pixels of the display area of the display case comprises:
s201, determining all pixels in color development states of a display screen by taking a transparent display screen as a plane;
s202, selecting a pixel in a color development state, and setting a nine-grid of 3*3 by taking the pixel in the color development state as the center;
s203, judging whether the pixels in the grids are all pixels in a color development state, if so, the selected pixels are not edge pixels, and if not, the selected pixels are edge pixels;
s204, executing S202-S203 on all pixels in the color development state, and determining all edge pixels;
s205, determining three-dimensional positions of all edge pixels of a display area of the display cabinet in a three-dimensional coordinate system.
6. A method of controlling illumination of a transparent screen display case according to claim 1, wherein the determining the non-overlapping and overlapping areas of the projected areas from the two center points comprises:
determining an LED lamp corresponding to a projection area on a plane of a backlight plate;
judging the number of projection areas falling in the area of any LED lamp;
if only one projection area falls in the area of the LED lamp, the LED lamp is marked as M;
if two projection areas fall in the area of the LED lamp, the LED lamp is marked as C;
all the areas formed by M are marked as non-overlapping areas of the projection areas;
all the areas of C are denoted as overlapping areas of the projection areas.
7. The method of claim 1, wherein calculating the difference between the backlight brightness and the average brightness of the display area comprises:
from the following componentsObtaining the brightness of each pixel of the display area;
from the following componentsObtaining the average brightness l of the display area;
from the following componentsObtaining a difference value;
wherein L is i Is the brightness of any one pixel in the display area, n is the number of pixels in the display area, A 1 Is the backlight brightness.
8. The lighting control method of a transparent screen display cabinet according to claim 1, wherein the adjusting the brightness of the projection area according to the positive and negative of the difference value comprises:
judging whether the difference value is more than or equal to 0;
if yes, setting an adjustment value t of the projection area to be 0;
if not, byObtaining an adjustment value t of a projection area;
according toSetting the brightness of the LED lamp corresponding to the projection area;
wherein A is 1 The brightness of the backlight plate is shown, and H is the difference.
9. The lighting control method of a transparent screen display cabinet according to claim 1, wherein the reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the magnitude of the difference value comprises:
from the following componentsObtaining a first reduction value E;
from the following componentsObtaining a second reduction value F;
according toSetting the brightness of the LED lamp corresponding to the non-overlapping area of the projection area;
according toSetting the brightness of the LED lamp corresponding to the overlapping area of the projection area;
wherein a and b are set proportion values, H is a difference value, D is the actual distance between eyes and the center of the display cabinet, D is the set maximum distance between eyes and the center of the display cabinet, A 2 And the brightness of the LED lamp corresponding to the projection area.
10. The utility model provides a lighting control device of transparent screen display cabinet which characterized in that, lighting control device of transparent screen display cabinet includes:
the eye recognition module is used for recognizing whether the image acquired by the camera has a human face or not, and if so, the plane positions of the center points of the two eyes in the human face are respectively determined;
the position determining module is used for establishing a three-dimensional coordinate system, and determining the three-dimensional positions of the two center points in the three-dimensional coordinate system;
the projection area module is used for connecting the edge pixels of the display area of the display cabinet with a ray for each center point by taking the three-dimensional position of the center point as a starting point and extending the ray to the backlight plate of the display cabinet, so that the ray moves along the edge of the display area to obtain a projection area of the display area;
the overlapping module is used for determining an overlapping area and a non-overlapping area of the projection area obtained by the two center points;
the brightness setting module is used for obtaining an ambient brightness value, and setting the brightness of the backlight plate according to a set comparison table by the ambient brightness value;
the calculating difference module is used for calculating the difference between the brightness of the backlight plate and the average brightness of the display area;
the brightness adjusting module is used for adjusting the brightness of the projection area according to the positive and negative of the difference value;
and the brightness reducing module is used for respectively reducing the brightness of the non-overlapping area and the overlapping area of the projection area according to the difference value.
CN202310900589.XA 2023-07-21 2023-07-21 Illumination control method and device for transparent screen display cabinet Active CN116634624B (en)

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