CN114927092B - Correction method, device and system for visual angle difference of LED display screen - Google Patents
Correction method, device and system for visual angle difference of LED display screen Download PDFInfo
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Abstract
The invention discloses a correction method, device and system for visual angle difference of an LED display screen, comprising the following steps: acquiring a current X-Y direction angle between a camera and a target LED display screen in real time; obtaining a visual angle difference coefficient matrix corresponding to a target LED display screen, and determining a current visual angle difference coefficient according to a current X-Y direction angle and the visual angle difference coefficient matrix corresponding to the target LED display screen; performing brightness correction on a current picture to be displayed of the target LED display screen according to the current visual angle difference coefficient to obtain a current picture to be displayed with visual angle difference eliminated; and sending the current picture to be displayed with the view angle difference eliminated to a receiving card of the target LED display screen, and controlling the target LED display screen to display the current picture to be displayed with the view angle difference eliminated through the receiving card. The method, the device and the system provided by the invention can monitor the shooting visual angle of the camera in real time, process and display the display picture of the LED display screen in real time, ensure that the shooting picture eliminates the visual angle difference and ensures the continuity of the picture.
Description
Technical Field
The invention relates to the field of LED display effect processing, in particular to a method, a device and a system for correcting the visual angle difference of an LED display screen.
Background
Along with the rapid development of display technology, the application of display screens is not limited to small-area screens such as mobile phones, flat panels and computers, very large-area display screens of tens or hundreds of square meters slowly enter the market, virtual XR shooting is gradually raised, and in the current XR virtual shooting project, an LED display screen is used as a scene simulation environment for carrying out XR virtual shooting.
However, the structural factor of the LED lamp causes the problem of the visual angle of the LED display screen, that is, the front view brightness is high and the side view brightness is low. When the LED display screen is shot by the camera, the problem of inconsistent picture brightness of the LED display screen shot by the camera at different shooting visual angles can be caused due to the problem of visual angle of the LED display screen; for a stereoscopic screen built by the same type of LED display screen in XR virtual shooting, when at least two non-coplanar LED display screens included in the stereoscopic screen are shot by the same camera, because the shooting viewing angles of the cameras are different for the non-coplanar LED display screens, the non-uniform brightness also causes discontinuous display pictures between the non-coplanar display screens shot by the cameras.
If the above problem occurs in the XR virtual shooting process, more time costs and money costs are required to solve the above problem at a later stage. Therefore, those skilled in the art need to find a new technical solution to solve the above problems.
Disclosure of Invention
Aiming at the problems, the invention provides a method, a device and a system for correcting the visual angle difference of an LED display screen.
The method for correcting the visual angle difference of the LED display screen comprises the following steps:
acquiring a current X-Y direction angle between a camera and a target LED display screen in real time, wherein the X direction angle is a horizontal angle and the Y direction angle is a vertical angle;
obtaining a visual angle difference coefficient matrix corresponding to a target LED display screen, and determining a current visual angle difference coefficient according to a current X-Y direction angle and the visual angle difference coefficient matrix corresponding to the target LED display screen;
performing brightness correction on a current picture to be displayed of the target LED display screen according to the current visual angle difference coefficient to obtain a current picture to be displayed with visual angle difference eliminated;
and sending the current picture to be displayed with the view angle difference eliminated to a receiving card of the target LED display screen, and controlling the target LED display screen to display the current picture to be displayed with the view angle difference eliminated through the receiving card.
Further, the visual angle difference coefficient matrix is pre-stored in a sending card or a broadcasting control server corresponding to the target LED display screen, and the visual angle difference coefficient matrix corresponding to the target LED display screen is obtained as follows:
after a current picture to be displayed of the target LED display screen is issued to a sending card or a broadcasting control server corresponding to the target LED display screen, a visual angle difference coefficient matrix corresponding to the target LED display screen is obtained from the sending card or the broadcasting control server corresponding to the target LED display screen.
Further, each type of LED display screen corresponds to a view angle difference coefficient matrix, and for a certain type of LED display screen, the method for generating the view angle difference coefficient matrix corresponding to the LED display screen includes:
taking the central point of the LED display screen of the type as a datum point, presetting brightness acquisition equipment on a straight line passing through the central point of the LED display screen and perpendicular to the LED display screen;
keeping the setting position of the brightness acquisition equipment unchanged, enabling the brightness acquisition equipment to be opposite to the central point of the LED display screen, enabling the X-Y direction angle between the brightness acquisition equipment and the LED display screen to be (0 degrees and 0 degrees), and acquiring a corresponding reference brightness value, wherein the reference brightness value comprises a red light reference brightness value RL (0,0) Standard brightness value GL of green light (0,0) Reference brightness value BL of blue lamp (0,0) ；
Changing X-Y direction angles between the brightness acquisition equipment and the LED display screen, respectively acquiring corresponding acquired brightness values under a plurality of preset X-Y direction angles, wherein the acquired brightness values comprise red light acquired brightness values RL (x ， y) Green light collecting brightness value GL (x，y) Blue lamp acquisition brightness value BL (x，y) ；
According to a viewing angle difference coefficient calculation formula and the acquired brightness values under each preset X-Y direction angle, calculating to obtain the corresponding viewing angle difference coefficient under each preset X-Y direction angle, wherein the viewing angle difference coefficient comprises a red light viewing angle difference coefficient CoefR (x，y) Coefficient of green light viewing angle difference CoefG (x，y) CoefB coefficient of viewing angle difference for blue lamp (x，y) Wherein, the view angle difference coefficient calculation formula is: viewing angle difference coefficient = reference luminance value/collection luminance value;
and taking a matrix formed by the view angle difference coefficients under each preset X-Y direction angle as a view angle difference coefficient matrix corresponding to the LED display screen.
Further, obtaining a view angle difference coefficient matrix corresponding to the target LED display screen, and determining the current view angle difference coefficient according to the current X-Y direction angle and the view angle difference coefficient matrix corresponding to the target LED display screen includes:
judging whether a view angle difference coefficient corresponding to the current X-Y direction angle exists in the view angle difference coefficient matrix, and if so, taking the view angle difference coefficient corresponding to the current X-Y direction angle as the current view angle difference coefficient;
if the current X-Y direction angle is not the same, calculating to obtain a view angle difference coefficient corresponding to the current X-Y direction angle as the current view angle difference coefficient by using a view angle difference coefficient matrix corresponding to the target LED display screen through a cubic spline interpolation method.
Further, for a certain type of LED display screen, the corresponding method for generating the viewing angle difference coefficient matrix further includes:
calculating to obtain the residual view angle difference coefficient under the X-Y direction angles according to the view angle difference coefficient under each preset X-Y direction angle by a cubic spline interpolation method;
and taking a matrix formed by the visual angle difference coefficient under the preset X-Y direction angle and the visual angle difference coefficient under the rest X-Y direction angle as a visual angle difference coefficient matrix corresponding to the LED display screen.
Further, obtaining a view angle difference coefficient matrix corresponding to the target LED display screen, and determining the current view angle difference coefficient according to the current X-Y direction angle and the view angle difference coefficient matrix corresponding to the target LED display screen includes:
and reading the view angle difference coefficient corresponding to the current X-Y direction angle from the view angle difference coefficient matrix corresponding to the target LED display screen, and determining the view angle difference coefficient as the current view angle difference coefficient.
Further, performing brightness correction on a current picture to be displayed of the target LED display screen according to the current viewing angle difference coefficient, and obtaining the current picture to be displayed for eliminating the viewing angle difference includes:
correcting the current brightness value of each lamp point in the current picture to be displayed to be a target brightness value to obtain the current picture to be displayed with the view angle difference eliminated;
where target luminance value = current luminance value x current view difference coefficient.
The invention also provides a device for correcting the visual angle difference of the LED display screen, which comprises a camera direction angle acquisition module, a visual angle difference coefficient matrix acquisition module, a visual angle difference coefficient determination module, a display screen correction module and a sending module, wherein:
the camera direction angle acquisition module is connected with the visual angle difference coefficient determination module and is used for acquiring the current X-Y direction angle between the camera and the target LED display screen in real time, wherein the X direction angle is a horizontal angle and the Y direction angle is a vertical angle;
the visual angle difference coefficient matrix acquisition module is connected with the visual angle difference coefficient determination module and is used for acquiring a visual angle difference coefficient matrix corresponding to the target LED display screen;
the visual angle difference coefficient determining module is connected with the display picture correcting module and is used for determining a current visual angle difference coefficient according to the current X-Y direction angle and a visual angle difference coefficient matrix corresponding to the target LED display screen;
the display picture correction module is connected with the sending module and is used for carrying out brightness correction on a current picture to be displayed of the target LED display screen according to the current visual angle difference coefficient to obtain a current picture to be displayed with the visual angle difference eliminated;
and the sending module is used for sending the current picture to be displayed with the view angle difference eliminated to a receiving card of the target LED display screen, and controlling the target LED display screen to display the current picture to be displayed with the view angle difference eliminated through the receiving card.
Further, the view angle difference coefficient matrix is pre-stored in a transmitting card or a broadcasting control server corresponding to the target LED display screen, and the view angle difference coefficient matrix obtaining module obtains the view angle difference coefficient matrix corresponding to the target LED display screen as follows:
after a current picture to be displayed of the target LED display screen is issued to a sending card or a broadcasting control server corresponding to the target LED display screen, a visual angle difference coefficient matrix corresponding to the target LED display screen is obtained from the sending card or the broadcasting control server corresponding to the target LED display screen.
The invention also provides a system for correcting the visual angle difference of the LED display screen, which comprises a broadcasting control server, a sending card and the LED display screen, wherein:
the broadcasting control server is connected with the sending card, and the sending card is connected with the receiving card in the LED display screen;
the broadcasting control server is used for obtaining the current picture to be displayed for eliminating the visual angle difference according to the correction method of the visual angle difference of the LED display screen, and sending the current picture to be displayed for eliminating the visual angle difference to a receiving card in the LED display screen through a sending card so as to control the LED display screen to display the current picture to be displayed for eliminating the visual angle difference through the receiving card.
The method, the device and the system for correcting the visual angle difference of the LED display screen provided by the invention at least comprise the following beneficial effects:
(1) The brightness of the current picture to be displayed of the LED display screen is corrected according to the current X-Y direction angle (namely the camera visual angle) between the camera and the target LED display screen, so that the visual angle difference is eliminated, the current picture to be displayed after the visual angle difference is eliminated is obtained and sent to a receiving card of the target LED display screen, the current picture to be displayed after the visual angle difference is eliminated is controlled by the receiving card to display the picture to be displayed after the visual angle difference is eliminated, the picture obtained by shooting the camera is the picture after the visual angle difference is eliminated for the target LED display screen, the brightness of the pictures obtained by shooting the visual angles of the camera is consistent, the effect of the picture shot by the camera is improved, and for a three-dimensional screen built by utilizing the LED display screen visual angle difference correction method, the picture to be displayed of each LED display screen in the three-dimensional screen is processed, so that the pictures of different LED display screens of the three-dimensional screen under the shooting visual angle of the camera are continuous.
(2) The invention adjusts the display picture of the target LED display screen in real time by acquiring the current X-Y direction angle between the camera and the target LED display screen in real time, so that the picture to be displayed of the target LED display screen can be corrected in time as long as the shooting visual angle of the camera is changed in the shooting process, and the brightness of the display picture of the target LED display screen shot under the shooting visual angle of the camera is consistent no matter how the shooting visual angle of the camera is changed.
(3) The invention corrects the current picture to be displayed before receiving the card to obtain the current picture to be displayed after eliminating the visual angle difference, and then directly sends the current picture to be displayed after eliminating the visual angle difference to the receiving card without correcting the receiving card, thereby avoiding the problem of discontinuous display picture playing process of the LED display screen caused by ' the black screen phenomenon caused by correcting the picture to be displayed in the receiving card ', and further generating the problem that the picture to be displayed cannot be applied in real time '.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for correcting the viewing angle difference of an LED display screen according to an embodiment of the invention;
FIG. 2 is a schematic top view of a camera and a target LED display screen according to an embodiment of the invention;
FIG. 3 is a schematic side view of a camera and a target LED display screen according to an embodiment of the invention;
FIG. 4 is a flowchart illustrating a method for generating a view angle difference coefficient matrix according to an embodiment of the present invention;
FIG. 5 is a flow chart of a current view angle difference coefficient determination method according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for generating a view angle difference coefficient matrix according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a device for correcting the viewing angle difference of an LED display screen according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a system for correcting the viewing angle difference of an LED display screen according to an embodiment of the present invention;
the system comprises a 701-camera direction angle acquisition module, a 702-view angle difference coefficient matrix acquisition module, a 703-view angle difference coefficient determination module, a 704-display screen correction module, a 705-transmission module, a 801-broadcasting control server, an 802-transmission card and 803-LED display screen.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In one embodiment of the present invention, as shown in fig. 1, the method for correcting the viewing angle difference of the LED display screen in the present invention includes the following steps:
step S101: and acquiring the current X-Y direction angle between the camera and the target LED display screen in real time.
Wherein the X-direction angle is a horizontal angle and the Y-direction angle is a vertical angle.
Specifically, fig. 2 is a schematic top view of the camera and the target LED display screen, fig. 3 is a schematic side view of the camera and the target LED display screen, as shown in fig. 2, an X-direction angle between the camera and the target LED display screen is θ1, and as shown in fig. 3, a Y-direction angle between the camera and the target LED display screen is θ2. That is, the current X-Y direction angle between the camera and the target LED display screen is denoted by (θ1, θ2), and further, during actual camera shooting, if there is only horizontal movement or vertical movement during camera shooting, only the angle of the camera in the horizontal direction or the vertical direction may be acquired here.
More specifically, in this step, static position information or dynamic position information of the shooting camera can be obtained through a professional camera tracking system (such as a positioning tracker), and the horizontal and vertical angles between the camera and the LED display screen are determined through the position information; the professional camera tracking system is applied to an XR virtual shooting scene and can be used for acquiring the movement angle of a camera.
Step S102: obtaining a visual angle difference coefficient matrix corresponding to the target LED display screen, and determining a current visual angle difference coefficient according to the current X-Y direction angle and the visual angle difference coefficient matrix corresponding to the target LED display screen.
Specifically, the view angle difference coefficient matrix is pre-stored in a storage medium (such as flash) in a transmitting card or a broadcasting control server corresponding to the target LED display screen, and the view angle difference coefficient matrix corresponding to the target LED display screen is obtained as follows: after a current picture to be displayed of a target LED display screen is issued to a sending card or a broadcasting control server corresponding to the target LED display screen, a visual angle difference coefficient matrix corresponding to the target LED display screen is obtained from the sending card or the broadcasting control server corresponding to the target LED display screen.
The view angle difference coefficient matrix comprises a plurality of view angle difference coefficients, and each view angle difference coefficient corresponds to one X-Y direction angle.
More specifically, in the present invention, each type of LED display screen corresponds to a matrix of viewing angle difference coefficients, that is, the matrix of viewing angle difference coefficients corresponding to the same type of LED display screen is the same, where the same type of LED display screen refers to a batch of LED display screens with the same size and structure.
In actual processing, corresponding visual angle difference coefficient matrixes can be generated for each type of LED display screen respectively, and when the display screen is used later, the corresponding visual angle difference coefficient matrixes are selected according to the type of the LED display screen and stored in a corresponding sending card or a broadcasting control server of the LED display screen.
Step S103: and carrying out brightness correction on the current picture to be displayed of the target LED display screen according to the current visual angle difference coefficient to obtain the current picture to be displayed with the visual angle difference eliminated.
Specifically, in this step, performing brightness correction on the current frame to be displayed refers to correcting brightness value data corresponding to each light point in the current frame to be displayed.
Further, performing brightness correction on a current picture to be displayed of the target LED display screen according to the current viewing angle difference coefficient, and obtaining the current picture to be displayed for eliminating the viewing angle difference includes:
correcting the current brightness value of each lamp point in the current picture to be displayed to be a target brightness value to obtain the current picture to be displayed with the view angle difference eliminated; where target luminance value = current luminance value x current view difference coefficient. The current brightness values of the lamp points in the picture to be displayed form a brightness matrix. In this step, the luminance matrix formed by the target luminance values of each lamp point in the picture to be displayed is calculated according to the above formula target luminance value=current luminance value×current viewing angle difference coefficient.
Specifically, the current brightness value of each light point in the current frame to be displayed actually refers to the brightness value of each pixel point in the frame to be displayed. Step S104: and sending the current picture to be displayed with the view angle difference eliminated to a receiving card of the target LED display screen, and controlling the target LED display screen to display the current picture to be displayed with the view angle difference eliminated through the receiving card.
According to the correction method for the visual angle difference of the LED display screen, the current X-Y direction angle (namely the visual angle of the camera) between the camera and the target LED display screen is obtained, the brightness of the current picture to be displayed of the LED display screen is corrected according to the current X-Y direction angle, so that the visual angle difference is eliminated, the current picture to be displayed after the visual angle difference is eliminated is obtained and is sent to the receiving card of the target LED display screen, the current picture to be displayed after the visual angle difference is eliminated is controlled by the receiving card to display the current picture to be displayed after the visual angle difference is eliminated, the picture shot by the camera is the picture after the visual angle difference is eliminated by the target LED display screen, the brightness of the picture shot by the camera at different shooting visual angles is consistent, and the picture shooting effect of the camera is improved. In the XR virtual shooting scene, shooting a three-dimensional screen built by using the same type of LED display screen, and processing the picture to be displayed of each LED display screen in the three-dimensional screen by using the correction method of the visual angle difference of the LED display screen, so that pictures of different LED display screens of the three-dimensional screen are continuous under the shooting visual angle of a camera. Further, in the XR virtual shooting scene, a picture shot by the camera is displayed in a display terminal of the television user.
In addition, the current X-Y direction angle between the camera and the target LED display screen is obtained in real time, so that the display picture of the target LED display screen is adjusted in real time, and in the shooting process, the picture to be displayed of the target LED display screen can be corrected in time as long as the shooting visual angle of the camera is changed, so that the brightness of the display picture of the target LED display screen shot under the shooting visual angle of the camera is consistent no matter how the shooting visual angle of the camera is changed.
In addition, the current picture to be displayed is corrected before the receiving card, so that the current picture to be displayed after the visual angle difference is eliminated is obtained, the current picture to be displayed after the visual angle difference is eliminated is directly transmitted to the receiving card, no correction work is needed in the receiving card (if the brightness correction is carried out on the display picture in the receiving card, the LED display screen is required to be re-lightened in order to display the corrected display picture, so that the transient black screen phenomenon of the LED display screen is caused), and the problem that the LED display screen is caused to be transient black screen due to the correction work of the picture to be displayed in the receiving card, so that the discontinuous display picture of the LED display screen is caused in the playing process is avoided.
In yet another embodiment of the present invention, as shown in fig. 4, for a certain type of LED display screen, the method for generating a corresponding viewing angle difference coefficient matrix includes the following steps:
step S401: taking the central point of the LED display screen of the type as a reference point, presetting the brightness acquisition equipment on a straight line passing through the central point of the LED display screen and perpendicular to the LED display screen.
Specifically, in the present embodiment, the luminance collecting device may be a device for measuring luminance such as a light gun.
Step S402: the setting position of the brightness acquisition equipment is kept unchanged, the brightness acquisition equipment is opposite to the central point of the LED display screen, the X-Y direction angle between the brightness acquisition equipment and the LED display screen is enabled to be (0 degrees ), and the corresponding reference brightness value is acquired.
Wherein the reference luminance value includesRed light reference brightness value RL (0,0) Standard brightness value GL of green light (0,0) Reference brightness value BL of blue lamp (0,0) 。
Specifically, when the X-Y direction angle is preset to be (0 ° ), the viewing angle difference coefficient is (1, 1), that is, the red light viewing angle difference coefficient is 1, the green light viewing angle difference coefficient is 1, and the blue light viewing angle difference coefficient is 1.
Step S403: and changing the X-Y direction angles between the brightness acquisition equipment and the LED display screen, and respectively acquiring corresponding acquired brightness values under a plurality of preset X-Y direction angles.
Wherein the collected brightness value comprises a red light collected brightness value RL (x，y) Green light collecting brightness value GL (x，y) Blue lamp acquisition brightness value BL (x，y) 。
Step S404: and calculating to obtain the corresponding view angle difference coefficient under each preset X-Y direction angle according to the view angle difference coefficient calculation formula and the acquired brightness value under each preset X-Y direction angle.
Wherein the viewing angle difference coefficient comprises a red light viewing angle difference coefficient CoefR (x，y) Coefficient of green light viewing angle difference CoefG (x，y) CoefB coefficient of viewing angle difference for blue lamp (x，y) 。
The view angle difference coefficient calculation formula is as follows: viewing angle difference coefficient = reference luminance value/collection luminance value;
it should be understood that the red light viewing angle difference coefficient=red light reference luminance value/red light collection luminance value, and the viewing angle difference coefficients of other colors are the same.
Specifically, as shown in the following table 1, the step size of the angle difference 45 is taken as an interval (wherein, angles of all intervals in the table 1 can be understood as selected feature points, and a view angle difference coefficient matrix corresponding to the feature points is a feature point matrix), so that the view angle difference coefficient calculated after the corresponding collected brightness values under each X-Y direction angle is collected, it should be understood that the step size can be set by a technician according to the actual situation, or the step size of the angle difference 5 can be taken as an interval, or other step sizes can be taken as intervals.
TABLE 1 View angle difference coefficient at a plurality of preset X-Y direction angles
Step S405: and taking a matrix formed by the view angle difference coefficients under each preset X-Y direction angle as a view angle difference coefficient matrix corresponding to the LED display screen.
In yet another embodiment of the present invention, as shown in fig. 5, based on the previous embodiment, step S102 includes the following steps:
step S1021: judging whether the view angle difference coefficient corresponding to the current X-Y direction angle exists in the view angle difference coefficient matrix, if so, executing step S1022, otherwise, executing step S1023.
Step S1022: and taking the view angle difference coefficient corresponding to the current X-Y direction angle as the current view angle difference coefficient.
Step S1023: and calculating a view angle difference coefficient corresponding to the current X-Y direction angle by using a view angle difference coefficient matrix corresponding to the target LED display screen through a cubic spline interpolation method to obtain the current view angle difference coefficient.
Specifically, in this step, a plurality of feature points (the view angle difference coefficient and the X-Y direction angle corresponding to the view angle difference coefficient) may be selected from the view angle difference coefficient matrix corresponding to the target LED display screen, to obtain a two-dimensional cubic spline interpolation function, and the current X-Y direction angle is to be put into the two-dimensional cubic spline interpolation function, to calculate to obtain the view angle difference coefficient corresponding to the current X-Y direction angle. Further, it should be understood that, for each color light point, a corresponding two-dimensional cubic spline interpolation function is obtained, and the current X-Y direction angle is respectively to be put into the two-dimensional cubic spline interpolation function corresponding to each color light point, so as to obtain the viewing angle difference coefficient corresponding to each color light point at the current X-Y direction angle.
More specifically, the parameter value in each cubic spline interpolation function can be obtained through known 4X-Y direction angles and the corresponding view angle difference coefficients thereof, a two-dimensional cubic spline interpolation function model is constructed through a plurality of cubic spline interpolation functions, and the corresponding view angle difference coefficient c can be obtained through calculation by inputting X, Y values only, namely, values of 16 points around the value of an interpolation point X, Y (16 points here refer to 16X-Y direction angles around the current X-Y direction angle, 16X-Y direction angles around the current X-Y direction angle can be determined through the sequence of all direction angles in table 1, and the value of 16 points is the view angle difference coefficient corresponding to the 16X-Y direction angles).
Specifically, it is provided witha(x)＝A0x 3 +A1x 2 +A2x+A3， b(x)＝B0x 3 +B1x 2 +B2x+B3，c(x)＝C0x 3 +C1x 2 +C2x+C3，d(x)＝D0x 3 +D1x 2 +d2x+d3, where l is the spacing between feature points.
Firstly, calculating to obtain parameter values in a (X), b (X), c (X) and d (X) by using known 4X-Y direction angles and corresponding visual angle difference coefficients.
Then, a (x), b (x), c (x) and d (x) are utilized to construct a two-dimensional cubic spline interpolation function:
wherein the viewing angle difference coefficient c=h (X, Y), the current X-Y direction angle and the viewing angle difference coefficients of 16X-Y direction angles around the current X-Y direction angle (h i-1，j-1 、h i，j-1 、h i+1，j-1 、h i+2，j-1 、h i-1，j 、h i，j 、h i+1，j 、h i+2，j 、h i-1，j+1 、h i，j+1 、h i+1，j+1 、h i+2，j+1 、h i-1，j+2 、h i，j+2 、h i+1，j+2 、h i+2，j+2 ) Substituting the two-dimensional cubic spline interpolation function to calculate a corresponding visual angle difference coefficient c. In the present embodiment, only a matrix formed by the viewing angle difference coefficients under the preset X-Y direction angle is stored in advance, and the current X-Y direction angle is determined subsequentlyWhen the corresponding visual angle difference coefficient is obtained by calculating by using a cubic spline interpolation method, the storage space of a transmitting card or a broadcasting control server occupied by the visual angle difference coefficient matrix can be reduced.
Meanwhile, the visual angle is a gradually changing relation, the visual angle difference coefficient corresponding to the visual angle is calculated by using a two-dimensional cubic spline interpolation method, so that the visual angle difference coefficient is finally used for correcting a picture to be displayed, when the visual angle of a camera is changed, the transition of the picture to be displayed of the front and rear LED display screens is smoother and more natural, people can visually look smoother and more natural, and the angle has no jump relation.
In still another embodiment of the present invention, as shown in fig. 6, for a certain type of LED display screen, the corresponding method for generating the viewing angle difference coefficient matrix further includes:
step S406: calculating to obtain the residual view angle difference coefficient under the X-Y direction angles according to the view angle difference coefficient under each preset X-Y direction angle by a cubic spline interpolation method;
step S405 in fig. 4 is replaced with: and taking a matrix formed by the visual angle difference coefficient under the preset X-Y direction angle and the visual angle difference coefficient under the rest X-Y direction angle as a visual angle difference coefficient matrix corresponding to the LED display screen.
Further, based on the generating method of the view angle difference coefficient matrix shown in fig. 6, step S102 is as follows: and reading the view angle difference coefficient corresponding to the current X-Y direction angle from the view angle difference coefficient matrix corresponding to the target LED display screen, and determining the view angle difference coefficient as the current view angle difference coefficient.
In this embodiment, the three spline interpolation method is used to calculate the view angle difference coefficients corresponding to all the X-Y direction angles as the view angle difference coefficient matrix for storage. After the current X-Y direction angle between the camera and the target LED display screen is obtained, the current X-Y direction angle is directly obtained from a pre-stored view angle difference coefficient matrix, calculation is not needed, the determination efficiency of the view angle difference coefficient corresponding to the current X-Y direction angle is improved, and the view angle difference elimination efficiency of the LED display screen is further improved. Of course, it should be appreciated that the method of this embodiment is applicable when the storage medium has a sufficiently large space.
The invention also provides a device for correcting the viewing angle difference of the LED display screen, as shown in fig. 7, the device comprises a camera direction angle acquisition module 701, a viewing angle difference coefficient matrix acquisition module 702, a viewing angle difference coefficient determination module 703, a display screen correction module 704 and a sending module 705, wherein:
the camera direction angle acquisition module 701 is connected with the visual angle difference coefficient determination module 703 and is used for acquiring the current X-Y direction angle between the camera and the target LED display screen in real time, wherein the X direction angle is a horizontal angle and the Y direction angle is a vertical angle;
the viewing angle difference coefficient matrix obtaining module 702 is connected with the viewing angle difference coefficient determining module 703 and is configured to obtain a viewing angle difference coefficient matrix corresponding to the target LED display screen.
The visual angle difference coefficient determining module 703 is connected with the display screen correcting module 704 and is used for determining a current visual angle difference coefficient according to the current X-Y direction angle and a visual angle difference coefficient matrix corresponding to the target LED display screen;
the display picture correction module 704 is connected with the sending module 705 and is used for carrying out brightness correction on a current picture to be displayed of the target LED display screen according to the current visual angle difference coefficient to obtain a current picture to be displayed with the visual angle difference eliminated;
and the sending module 705 is configured to send the current frame to be displayed with the view angle difference eliminated to a receiving card of the target LED display screen, and control the target LED display screen to display the current frame to be displayed with the view angle difference eliminated through the receiving card.
Further, the view angle difference coefficient matrix is pre-stored in a sending card or a broadcasting control server corresponding to the target LED display screen, and the view angle difference coefficient matrix obtaining module 702 obtains the view angle difference coefficient matrix corresponding to the target LED display screen as follows:
after a current picture to be displayed of the target LED display screen is issued to a sending card or a broadcasting control server corresponding to the target LED display screen, a visual angle difference coefficient matrix corresponding to the target LED display screen is obtained from the sending card or the broadcasting control server corresponding to the target LED display screen.
The invention also provides a system for correcting the visual angle difference of the LED display screen, as shown in fig. 8, the system comprises a broadcasting control server 801, a sending card 802 and the LED display screen 803, wherein:
the broadcast control server 801 is connected with a sending card 802, and the sending card 802 is connected with a receiving card in the LED display 803;
the broadcast control server 801 is configured to obtain a current to-be-displayed picture for eliminating the viewing angle difference according to the above-mentioned correction method for the viewing angle difference of the LED display screen, and send the current to-be-displayed picture for eliminating the viewing angle difference to a receiving card in the LED display screen 803 through the sending card 802, so as to control the LED display screen 803 to display the current to-be-displayed picture for eliminating the viewing angle difference through the receiving card.
According to the correction method, the device and the system for the visual angle difference of the LED display screen, the current X-Y direction angle (namely the camera visual angle) between the camera and the target LED display screen is obtained, the brightness of the current to-be-displayed picture of the LED display screen is corrected according to the current X-Y direction angle, so that the visual angle difference is eliminated, the current to-be-displayed picture after the visual angle difference is obtained and is sent to the receiving card of the target LED display screen, the receiving card is used for controlling the target LED display screen to display the current to-be-displayed picture after the visual angle difference is eliminated, the picture shot by the camera is the picture after the visual angle difference is eliminated, the brightness of pictures shot by the camera at different shooting visual angles is consistent, the effect of the pictures shot by the camera is improved, and for the three-dimensional screen built by utilizing the LED display screen visual angle difference correction method, the to-be-displayed picture of each LED display screen in the three-dimensional screen is processed, and the pictures of different LED display screens of the three-dimensional screen under the shooting visual angle are continuous. In addition, the current X-Y direction angle between the camera and the target LED display screen is obtained in real time, so that the display picture of the target LED display screen is adjusted in real time, and in the shooting process, the picture to be displayed of the target LED display screen can be corrected in time as long as the shooting visual angle of the camera is changed, so that the brightness of the display picture of the target LED display screen shot under the shooting visual angle of the camera is consistent no matter how the shooting visual angle of the camera is changed. In addition, the invention corrects the current picture to be displayed before the receiving card to obtain the current picture to be displayed after the visual angle difference is eliminated, and then the current picture to be displayed after the visual angle difference is eliminated is directly sent to the receiving card, any correction work (the short-term black screen phenomenon of the LED display screen is caused if the picture to be displayed is corrected in the receiving card) is not needed in the receiving card, so that the problem of discontinuous display process of the LED display screen caused by the short-term black screen phenomenon of the LED display screen due to the correction work of the picture to be displayed in the receiving card is avoided.
The terms and expressions used in the description of the present invention are used as examples only and are not meant to be limiting. It will be appreciated by those skilled in the art that numerous changes may be made to the details of the above-described embodiments without departing from the underlying principles of the disclosed embodiments. The scope of the invention is, therefore, to be determined only by the following claims, in which all terms are to be understood in their broadest reasonable sense unless otherwise indicated.
Claims (10)
1. The method for correcting the visual angle difference of the LED display screen is characterized by comprising the following steps:
acquiring a current X-Y direction angle between a camera and a target LED display screen in real time, wherein the X direction angle is a horizontal angle and the Y direction angle is a vertical angle;
acquiring a visual angle difference coefficient matrix corresponding to the target LED display screen, and determining a current visual angle difference coefficient according to the current X-Y direction angle and the visual angle difference coefficient matrix corresponding to the target LED display screen;
performing brightness correction on a current picture to be displayed of the target LED display screen according to the current visual angle difference coefficient to obtain a current picture to be displayed with visual angle difference eliminated;
the current picture to be displayed, which eliminates the visual angle difference, is sent to a receiving card of the target LED display screen, and the target LED display screen is controlled by the receiving card to display the current picture to be displayed, which eliminates the visual angle difference;
each type of LED display screen corresponds to a visual angle difference coefficient matrix, and the generation method of the visual angle difference coefficient matrix corresponding to each type of LED display screen comprises the following steps: taking the central point of the LED display screen of the type as a datum point, presetting brightness acquisition equipment on a straight line passing through the central point of the LED display screen and perpendicular to the LED display screen; keeping the setting position of the brightness acquisition equipment unchanged, enabling the brightness acquisition equipment to be opposite to the central point of the LED display screen, enabling the X-Y direction angle between the brightness acquisition equipment and the LED display screen to be (0 degrees ) and acquiring a corresponding reference brightness value; changing the X-Y direction angles between the brightness acquisition equipment and the LED display screen, and respectively acquiring corresponding acquired brightness values under a plurality of preset X-Y direction angles; according to a view angle difference coefficient calculation formula and acquisition brightness values under each preset X-Y direction angle, calculating to obtain corresponding view angle difference coefficients under each preset X-Y direction angle, wherein the view angle difference coefficient calculation formula is as follows: viewing angle difference coefficient = reference luminance value/collection luminance value; and taking a matrix formed by the view angle difference coefficients under each preset X-Y direction angle as a view angle difference coefficient matrix corresponding to the LED display screen.
2. The method for correcting the viewing angle difference of the LED display screen according to claim 1, wherein the viewing angle difference coefficient matrix is pre-stored in a transmitting card or a broadcasting server corresponding to the target LED display screen, and the obtaining the viewing angle difference coefficient matrix corresponding to the target LED display screen is:
after a current picture to be displayed of the target LED display screen is issued to a sending card or a broadcasting control server corresponding to the target LED display screen, a visual angle difference coefficient matrix corresponding to the target LED display screen is obtained from the sending card or the broadcasting control server corresponding to the target LED display screen.
3. The method for correcting a viewing angle difference of an LED display screen according to claim 2, wherein a setting position of the brightness acquisition device is maintainedThe brightness acquisition equipment is opposite to the central point of the LED display screen, the X-Y direction angle between the brightness acquisition equipment and the LED display screen is enabled to be (0 degrees and 0 degrees), the corresponding reference brightness value is acquired, and the reference brightness value comprises a red light reference brightness value RL (0,0) Standard brightness value GL of green light (0,0) Reference brightness value BL of blue lamp (0,0) The method comprises the steps of carrying out a first treatment on the surface of the Changing the X-Y direction angles between the brightness acquisition equipment and the LED display screen, respectively acquiring corresponding acquisition brightness values under a plurality of preset X-Y direction angles, wherein the acquisition brightness values comprise red light acquisition brightness values RL (x，y) Green light collecting brightness value GL (x，y) Blue lamp acquisition brightness value BL (x，y) The method comprises the steps of carrying out a first treatment on the surface of the According to a viewing angle difference coefficient calculation formula and the acquired brightness values under each preset X-Y direction angle, calculating to obtain the corresponding viewing angle difference coefficient under each preset X-Y direction angle, wherein the viewing angle difference coefficient comprises a red light viewing angle difference coefficient CoefR (x，y) Coefficient of green light viewing angle difference CoefG (x，y) CoefB coefficient of viewing angle difference for blue lamp (x，y) 。
4. The method for correcting a viewing angle difference of an LED display screen according to claim 3, wherein the obtaining a viewing angle difference coefficient matrix corresponding to the target LED display screen, and determining the current viewing angle difference coefficient according to the current X-Y direction angle and the viewing angle difference coefficient matrix corresponding to the target LED display screen comprises:
judging whether a viewing angle difference coefficient corresponding to the current X-Y direction angle exists in the viewing angle difference coefficient matrix, and taking the viewing angle difference coefficient corresponding to the current X-Y direction angle as the current viewing angle difference coefficient if the viewing angle difference coefficient exists;
if the current X-Y direction angle is not the same, calculating to obtain a view angle difference coefficient corresponding to the current X-Y direction angle as a current view angle difference coefficient by using a view angle difference coefficient matrix corresponding to the target LED display screen through a cubic spline interpolation method.
5. The method for correcting viewing angle differences of LED display screens according to claim 3, wherein for a certain type of LED display screen, the corresponding method for generating a viewing angle difference coefficient matrix further comprises:
calculating to obtain the residual view angle difference coefficient under the X-Y direction angles according to the view angle difference coefficient under each preset X-Y direction angle by a cubic spline interpolation method;
and taking a matrix formed by the visual angle difference coefficient under the preset X-Y direction angle and the visual angle difference coefficient under the rest X-Y direction angle as a visual angle difference coefficient matrix corresponding to the LED display screen.
6. The method for correcting a viewing angle difference of an LED display screen according to claim 5, wherein the obtaining a viewing angle difference coefficient matrix corresponding to the target LED display screen, and determining the current viewing angle difference coefficient according to the current X-Y direction angle and the viewing angle difference coefficient matrix corresponding to the target LED display screen comprises:
and reading the view angle difference coefficient corresponding to the current X-Y direction angle from the view angle difference coefficient matrix corresponding to the target LED display screen, and determining the view angle difference coefficient as the current view angle difference coefficient.
7. The method for correcting the viewing angle difference of the LED display screen according to claim 1, wherein the performing brightness correction on the current frame to be displayed of the target LED display screen according to the current viewing angle difference coefficient to obtain the current frame to be displayed with the viewing angle difference eliminated comprises:
correcting the current brightness value of each lamp point in the current picture to be displayed to be a target brightness value so as to obtain the current picture to be displayed with the view angle difference eliminated;
where target luminance value = current luminance value x current view difference coefficient.
8. The device for correcting the visual angle difference of the LED display screen is characterized by comprising a camera direction angle acquisition module, a visual angle difference coefficient matrix acquisition module, a visual angle difference coefficient determination module, a display screen correction module and a sending module, wherein:
the camera direction angle acquisition module is connected with the visual angle difference coefficient determination module and is used for acquiring the current X-Y direction angle between the camera and the target LED display screen in real time, wherein the X direction angle is a horizontal angle and the Y direction angle is a vertical angle;
the visual angle difference coefficient matrix acquisition module is connected with the visual angle difference coefficient determination module and is used for acquiring a visual angle difference coefficient matrix corresponding to the target LED display screen;
the visual angle difference coefficient determining module is connected with the display picture correcting module and is used for determining a current visual angle difference coefficient according to the current X-Y direction angle and a visual angle difference coefficient matrix corresponding to the target LED display screen;
the display picture correction module is connected with the sending module and is used for carrying out brightness correction on a current picture to be displayed of the target LED display screen according to the current visual angle difference coefficient to obtain a current picture to be displayed with the visual angle difference eliminated;
the sending module is used for sending the current to-be-displayed picture eliminating the visual angle difference to a receiving card of the target LED display screen, and controlling the target LED display screen to display the current to-be-displayed picture eliminating the visual angle difference through the receiving card;
each type of LED display screen corresponds to a visual angle difference coefficient matrix, and a visual angle difference coefficient matrix corresponding to each type of LED display screen is generated: taking the central point of the LED display screen of the type as a datum point, presetting brightness acquisition equipment on a straight line passing through the central point of the LED display screen and perpendicular to the LED display screen; keeping the setting position of the brightness acquisition equipment unchanged, enabling the brightness acquisition equipment to be opposite to the central point of the LED display screen, enabling the X-Y direction angle between the brightness acquisition equipment and the LED display screen to be (0 degrees ) and acquiring a corresponding reference brightness value; changing the X-Y direction angles between the brightness acquisition equipment and the LED display screen, and respectively acquiring corresponding acquired brightness values under a plurality of preset X-Y direction angles; according to a view angle difference coefficient calculation formula and acquisition brightness values under each preset X-Y direction angle, calculating to obtain corresponding view angle difference coefficients under each preset X-Y direction angle, wherein the view angle difference coefficient calculation formula is as follows: viewing angle difference coefficient = reference luminance value/collection luminance value; and taking a matrix formed by the view angle difference coefficients under each preset X-Y direction angle as a view angle difference coefficient matrix corresponding to the LED display screen.
9. The device for correcting the viewing angle difference of the LED display screen according to claim 8, wherein the viewing angle difference coefficient matrix is pre-stored in a transmitting card or a broadcasting server corresponding to the target LED display screen, and the viewing angle difference coefficient matrix obtaining module obtains the viewing angle difference coefficient matrix corresponding to the target LED display screen as follows:
after a current picture to be displayed of the target LED display screen is issued to a sending card or a broadcasting control server corresponding to the target LED display screen, a visual angle difference coefficient matrix corresponding to the target LED display screen is obtained from the sending card or the broadcasting control server corresponding to the target LED display screen.
10. The utility model provides a correction system of LED display screen visual angle difference, its characterized in that, the system includes broadcast accuse server, sending card and LED display screen, wherein:
the broadcasting control server is connected with the sending card, and the sending card is connected with the receiving card in the LED display screen;
the broadcasting control server is configured to obtain a current to-be-displayed picture for eliminating the viewing angle difference according to the method for correcting the viewing angle difference of the LED display screen according to any one of claims 1 to 7, and send the current to-be-displayed picture for eliminating the viewing angle difference to a receiving card in the LED display screen through the sending card, so as to control the LED display screen to display the current to-be-displayed picture for eliminating the viewing angle difference through the receiving card.
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