CN113611244A - LED display screen contrast improving method and LED display screen - Google Patents
LED display screen contrast improving method and LED display screen Download PDFInfo
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- 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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
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Abstract
The invention relates to the technical field of LED display, and particularly discloses a method for improving the contrast of an LED display screen and the LED display screen, wherein the method comprises the following steps: dividing the LED display screen into a plurality of unit blocks of m lamp points according to a preset lamp point division strategy; acquiring a gray input value of a frame of image; defining a lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, wherein the lamp point P comprises an integer part Pi and a decimal part Pj; and selecting and displaying the lamp points in the unit block. According to the LED display screen contrast improving method and the LED display screen, the effect that only part of the lamp points are lighted in each frame of image is achieved, so that the contrast of image display is improved, the transition of the color bars of the displayed image is more uniform and fine, the condition of low gray scale ash jump is repaired, the problems of excessive poor color bars, jitter, ash jump and the like of the LED display screen are effectively solved, and the image display effect of the LED display screen is improved.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to a method for improving the contrast of an LED display screen and the LED display screen.
Background
The LED display screen has the characteristics of low energy consumption, high brightness, long service life, good performance stability and the like, is widely applied to indoor places such as command centers, video conference rooms, studio and markets and outdoor large-screen display, and has higher and higher requirements on display effects such as contrast, brightness, resolution and the like along with the development of the technology.
The current LED display screen is affected by the characteristics of the light emitting chip, and the screen gray brightness is too high, usually 0.2cd/m2, and the brightness cannot meet the customer requirements. In addition, because the gray scale precision of the existing LED display screen is not enough, the difficulty in repairing the LED display screen by low gray scale jumping is high, so that the problem can be solved by adopting a method for improving the gray scale precision of the LED display screen, but the phenomena of excessive poor color bar, shaking, jumping of gray and the like can occur on the LED display screen after the gray scale precision of the display screen is improved, so that the display effect of the LED display screen is poor.
Therefore, there is a need to find a new technical solution to solve the above problems.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method for improving the contrast of an LED display screen and the LED display screen.
The invention discloses a method for improving the contrast of an LED display screen, which comprises the following steps:
dividing the LED display screen into a plurality of unit blocks of m lamp points according to a preset lamp point division strategy;
acquiring a gray input value of a frame of image;
defining a lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, wherein the lamp point P comprises an integer part Pi and a decimal part Pj;
selecting and displaying the lamp points in the unit block; the method comprises the following steps:
selecting the lamp points in a unit block according to the decimal part Pj of the lamp points P and a preset first display lamp point selection strategy in m × m lamp points of the unit block, and displaying according to the preset lamp point display strategy;
in the unit block, selecting the lamp points in the unit block according to the decimal part Pj of the lamp points P and a preset second display lamp point selection strategy, and displaying according to the lamp point display strategy;
and judging whether all the cell blocks under the current frame image are displayed or not, if not, repeating the previous step, if so, acquiring the gray scale input value of the next frame image, and executing the subsequent steps.
Further, the first display light point selection strategy is as follows:
sequentially judging whether the decimal part Pj of each lamp point P in one unit block is greater than N/2; if so, then
Selecting the lamp point; if not, then
The lamp point is not selected.
Further, the second display lamp point selection strategy includes:
calculating the cell block decimal and block.sum of the cell block, wherein the cell block decimal and block.sum are the sum of decimal parts Pj of m lamp points in the cell block;
judging whether the cell block decimal and block.sum are larger than the gray scale expansion multiple N or not; if so, then
Calculating the number of lamp points to be selected by the unit block, wherein the number of the lamp points is equal to the quotient of the decimal number of the unit block and the quotient obtained by dividing block.sum by the gray scale expansion multiple N;
randomly selecting a corresponding number of lamp points in the unit block according to the number of the lamp points; if not, then
The lamp point in the cell block is not selected.
Further, the light point display strategy comprises:
and judging whether the decimal part Pj of the selected lamp point P is larger than 0, if so, re-assigning the integral part Pi and the decimal part Pj of the lamp point P, enabling the integral part Pi to be the original integral part Pi plus 1, and enabling the decimal part Pj to be the original decimal part Pj minus N.
Further, defining a lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, where the lamp point P includes an integer part Pi and a fractional part Pj, and further including:
and judging whether the decimal part Pj of the lamp point P is smaller than 0 and whether the integer part Pi is larger than 0, if so, re-assigning the integer part Pi and the decimal part Pj of the lamp point P, reducing the integer part Pi to the original integer part Pi by 1, and adding N to the decimal part Pj.
Further, defining a lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, where the lamp point P includes an integer part Pi and a fractional part Pj, and includes:
acquiring a gray level input value A of a current frame image of a lamp point P;
calculating the quotient of integer part Pi as A/N;
calculating the remainder of the A/N of the current in the decimal part Pj;
judging whether the lamp point P has a decimal part Pj.last under the previous frame of image; if yes, making the decimal part Pj equal to Pj. If not, the decimal part Pj is made equal to Pj.
Further, divide the LED display screen into a plurality of cell blocks of m lamp points according to the predetermined lamp point division strategy, include:
the method comprises the steps that from the first lamp point of the first row of the LED display screen to the last lamp point of the last row of the LED display screen, the full screen of the LED display screen is divided into a plurality of unit blocks, and any lamp point in the LED display screen only belongs to one unit block.
Further, the grayscale expansion factor N is 2, 4, 8, 16, 64, or 128.
The invention also provides an LED display screen with improved contrast, which comprises a lamp point dividing module, an image acquisition module, a gray scale expanding module, a display lamp point selecting module and a display module, wherein:
the lamp point dividing module is connected with the display lamp point selecting module and used for dividing the LED display screen into a plurality of unit blocks of m lamp points according to a preset lamp point dividing strategy;
the image acquisition module is connected with the gray level expansion module and used for acquiring a gray level input value of one frame of image;
the gray scale expansion module is connected with the image acquisition module and the display lamp point selection module and used for defining the lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, and the lamp point P comprises an integer part Pi and a decimal part Pj;
the display lamp point selection module is connected with the lamp point division module, the gray scale expansion module and the display module and is used for selecting and displaying the lamp points in the unit block; the method comprises the following steps:
selecting the lamp points in a unit block according to the decimal part Pj of the lamp points P and a preset first display lamp point selection strategy from m × m lamp points of the unit block;
in the unit block, selecting the lamp points in the unit block according to the decimal part Pj of the lamp points P and a preset second display lamp point selection strategy;
and the display module is connected with the display lamp point selection module and used for displaying according to a preset lamp point display strategy when each lamp point is selected.
Further, the display lamp point selection module includes a first display lamp point selection unit and a second display lamp point selection unit, wherein:
the first display lamp point selection unit is used for sequentially judging whether the decimal part Pj of the lamp points P in one unit block is greater than N/2; if yes, selecting the lamp point; if not, the lamp point is not selected;
a second display light point selecting unit for calculating the cell block decimal and block.sum of the decimal parts Pj of m × m light points in the cell block; judging whether the cell block decimal and block.sum are larger than N; if yes, calculating the number of the lamp points to be selected by the unit block, wherein the number of the lamp points is equal to the quotient of the decimal number of the unit block and the block.sum divided by N, and randomly selecting a corresponding number of the lamp points in the unit block according to the number of the lamp points; if not, the lamp point in the unit block is not selected.
According to the LED display screen contrast improvement method and the LED display screen, the lamp points of the LED display screen are divided into the unit blocks, the original gray value of an image frame is redefined, the corresponding number of the lamp points are selected in each unit block through the fractional part of the value and the corresponding strategy, the lamp points are displayed according to the corresponding strategy, and finally the effect that only part of the lamp points are lightened by each frame of image is achieved in a certain mode, so that the contrast of image display is improved, the transition of color bars of a displayed image is more uniform, fine and smooth, the condition of low gray level jump is repaired, the problems of excessive difference, jitter, gray jump and the like of the color bars of the LED display screen are effectively solved, and the image display effect of the LED display screen is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart illustrating a first step of a method for improving contrast of an LED display screen according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating cell block division of a contrast ratio enhancement method for an LED display screen according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a second step of a method for improving contrast of an LED display screen according to an embodiment of the present invention;
FIG. 4 is a flowchart (III) illustrating steps of a method for improving contrast of an LED display screen according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a step of a method for improving contrast of an LED display screen according to an embodiment of the present invention;
FIG. 6 is a structural composition diagram of an LED display screen with improved contrast according to an embodiment of the present invention;
fig. 7 is a structural composition diagram of an LED display screen with improved contrast according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a method for improving the contrast of an LED display screen, which comprises the following steps of:
step S10: and dividing the LED display screen into a plurality of unit blocks of m lamp points according to a preset lamp point division strategy.
In this step, the light points in the display area of the LED display screen are divided, m × m light points form a square unit block, where m in the embodiment of the present invention is an integer greater than or equal to 2, and preferably, in combination with the general light point arrangement rule of the LED display screen, m is a multiple of 4, for example, m is 4, 8, 16, 32, and the like, as shown in fig. 2, the present invention is described by taking m ═ 4 as an example, that is, the unit block of the embodiment of the present invention is composed of 16 light points of 4 × 4, which are respectively represented as P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, and P16.
The number of the unit blocks depends on the value of m on one hand and the size of the LED display screen on the other hand, and the larger the number of the lamp points of the LED display area is, the larger the number of the corresponding divided unit blocks is.
Step S20: the gray scale input value of one frame of image is obtained.
The embodiment of the invention improves the contrast of each frame of image displayed by the LED display screen, and the embodiment of the invention does not limit the range of the gray scale input value, and is specifically determined according to the gray scale precision, for example, the gray scale range can be 0-255, or 0-65536. The invention is explained by taking 0-255 as an example, and the invention is also suitable for the gray scale range after bit expansion of the original gray scale, namely 2 gray scalesnThe expanded gray scale range is expanded by 64 times (2 times) for expanding bit to 6bit, namely, expanding the original gray scale6Double), the gray level precision of the display screen is improved by 64 times, the contrast of a display picture is improved, and the display effect of the screen is improved. The gray scale input value of one frame of image is obtained from a preset gamma table.
Taking table 1 as an example, the lamp points P1 to P16 corresponding to the cell blocks shown in fig. 2 have the following grayscale input values:
TABLE 1
| 205 | 38 | 54 | 241 |
| 114 | 182 | 109 | 150 |
| 64 | 227 | 132 | 201 |
| 143 | 22 | 98 | 88 |
Step S30: and defining the lamp point P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, wherein the lamp point P comprises an integer part Pi and a decimal part Pj.
The value of the gray scale expansion multiple N is 2nAs a result, n represents that when the gray scale is expanded, bit is expanded to nbit, 2nThe value of (b) is a multiple of the corresponding gray scale expansion, so the gray scale expansion multiple N is 2, 4, 8, 16, 64, 128, or the like. An embodiment of the present invention is shown at 64 (2)6Multiple) is explained as a gray scale expansion multiple. For integer part of lamp point PThe values of Pi and the fractional part Pj are specifically shown in fig. 3 and the following steps:
step S301: and acquiring a gray scale input value A of the current frame image of the lamp point P.
Step S302: the integer part Pi is calculated as the quotient of A/N.
Step S303: the fractional part Pj current is calculated as the remainder of A/N.
Calculating the values of the integer part Pi and the fractional part pj of the lamp points P1 to P16 in combination with table 1, then 205/64 is 3 … … 13 for the lamp point P1, so that the integer part Pi of the lamp point P1 is 3 and the fractional part pj is 13; for lamp point P2, 38/64 is 0 … … 38, so the integer part Pi of lamp point P2 is 0 and the fractional part pj is current 38; for lamp point P3, 54/64 is 0 … … 54, so that the integer part Pi of lamp point P3 is 3 and the fractional part pj is 13; for lamp point P4, 241/64 is 3 … … 49, so that the integer part Pi of lamp point P4 is 3 and the fractional part pj is 13; for lamp point P5, 114/64 is 1 … … 50, so that the integer part Pi of lamp point P5 is 1 and the fractional part pj is 50; for lamp point P6, 182/64 is 2 … … 54, so that the integer part Pi of lamp point P6 is 2 and the fractional part pj is 54; for lamp point P7, 109/64 is 1 … … 45, so that the integer part Pi of lamp point P7 is 1 and the fractional part pj is 45; for lamp point P8, 150/64 is 2 … … 22, so that the integer part Pi of lamp point P8 is 2 and the fractional part pj is 22; for lamp point P9, 64/64 is 1 … … 0, so that the integer part Pi of lamp point P9 is 1 and the fractional part pj is 0; for lamp point P10, 227/64 is 3 … … 35, so that the integer part Pi of lamp point P10 is 3 and the fractional part pj is 35; for lamp point P11, 132/64 is 2 … … 4, so that the integer part Pi of lamp point P11 is 2 and the fractional part pj is 4; for lamp point P12, 201/64 is 3 … … 9, so that the integer part Pi of lamp point P12 is 3 and the fractional part pj is 9; for lamp point P13, 143/64 is 2 … … 15, so that the integer part Pi of lamp point P13 is 2 and the fractional part pj is 15; for lamp point P14, 22/64 is 0 … … 22, so that the integer part Pi of lamp point P14 is 0 and the fractional part pj is 22; for lamp point P15, 98/64 equals 1 … … 34, so that the integer part Pi of lamp point P15 equals 1 and the fractional part pj current equals 34; for lamp point P16, 88/64 is 1 … … 24, so that the integer part Pi of lamp point P16 is 1 and the fractional part pj is 24. Specifically, as shown in table 1:
TABLE 2
Step S304: and judging whether the lamp point P has a decimal part Pj.last under the previous frame of image.
If the light point P has the decimal part Pj.last under the previous frame image, the current frame image is not the first image, and if the light point P has no decimal part Pj.last under the previous frame image, the current frame image is the first frame image. Therefore, if there is a fractional part pj.last, step S305 is performed. If there is no decimal part pj.last, step S306 is executed. Namely:
step S305: let fraction Pj equal to Pj current + Pj last;
step S306: let fraction Pj equal Pj current.
Through steps S301 to S306, the definition of the lighting point P under the current frame image is completed, and then step S40 is performed.
Step S40: and selecting and displaying the lamp points in the unit block.
As shown in fig. 4, includes:
step S401: in m × m lamp points of a unit block, the lamp points in the unit block are selected according to the decimal part Pj of the lamp points P and a preset first display lamp point selection strategy, and are displayed according to a preset lamp point display strategy.
In this step, the lamp points in the cell block are used as basic judgment objects, and when m is 4, the 16 lamp points in one cell block are sequentially judged according to the decimal part Pj of the lamp point P and a preset first display lamp point selection strategy, and finally, the lamp point to be displayed is selected from the 16 lamp points and displayed.
Specifically, the first display light point selection strategy in this step is:
sequentially judging whether the decimal part Pj of each lamp point P in one unit block is greater than N/2; if yes, selecting the lamp point; if not, the lamp point is not selected.
In the first strategy for selecting a lamp point for display of this embodiment, the value of the fractional part Pj of the lamp point P is compared with the set value, and the set value in this strategy is N/2, i.e. half of N, so that when N is equal to 64, the lamp point is selected if the fractional part Pj of the lamp point P is greater than 32, and the lamp point is not selected if the fractional part Pj of the lamp point P is less than or equal to 32. With the values of each lamp fraction Pj listed in table 2, the lamp selected by this step includes: lamp point P2, lamp point P3, lamp point P4, lamp point P5, lamp point P6, lamp point P7, lamp point P10, and lamp point P15.
Selecting and displaying the light points in the cell block, and selecting and displaying the light points of the whole cell block as step S402.
Step S402: in the unit block, the lamp point in the unit block is selected according to the decimal part Pj of the lamp point P and a preset second display lamp point selection strategy, and is displayed according to the lamp point display strategy.
In this step, the whole cell block is used as a basic judgment object, and when m is 4, the judgment is performed once in 16 lamp points in the cell block according to the decimal part Pj of the lamp point P and a preset second display lamp point selection strategy, and finally, the lamp point to be displayed is selected in the cell block and displayed.
Specifically, the second display light point selection strategy included in this step, as shown in fig. 5, includes:
step S4021: and calculating the cell block decimal and block.sum of the cell blocks, wherein the cell block decimal and block.sum are the sum of decimal parts Pj of m lamp points in the cell block.
Taking table 2 as an example, the cell block decimal and block of the cell block is 13+38+54+49+50+54+45+22+0+35+4+9+15+22+34+24 is 486.
Step S4022: and judging whether the cell block decimal and block.sum are larger than the gray scale expansion multiple N.
If the cell block decimal and the block.sum are larger than the gray scale expansion multiple N, executing a step S4023; if the cell block decimal and block.sum are less than or equal to the gray scale expansion multiple N, step S4025 is performed.
If the cell block decimal and block of the cell block is 486 and greater than the gray scale expansion multiple 64 by the calculation in the step S4021, the step S4023 is performed.
Step S4023: and calculating the number of the lamp points to be selected by the unit block, wherein the number of the lamp points is equal to the quotient of the decimal number of the unit block and the quotient of block.sum divided by the gray scale expansion multiple N.
Sum of cell block decimal and block divided by the gray scale expansion factor N, where N is 64, the number of light points is 7 by calculating 486/64 to 7 … … 38.
Step S4024: and randomly selecting a corresponding number of lamp points in the unit block according to the number of the lamp points.
According to the light points listed in table 2, if the number of light points to be selected by the unit block is 7, 7 light points are randomly selected from the 16 light points in the unit block.
Step S4025: the lamp point in the cell block is not selected.
Sum of the cell block decimal number and block is less than or equal to 64, the number of the selected lamp points of the cell block is 0, that is, the lamp points in the cell block are not selected.
Step S50: and judging whether all the cell blocks under the current frame image are completely displayed, if not, repeating the step S40 until all the cell blocks are completely displayed. If all the cell blocks under the current frame image are displayed, the gray scale input value of the next frame image is obtained, and step S30 to step S40 are executed to display the next frame image. And all the image frames are displayed on the LED display screen through circulation of the steps.
The method divides the lamp points of the LED display screen into the unit blocks, redefines the original gray value of the image frame, selects the corresponding number of lamp points in each unit block through the fractional part value and the corresponding strategy, and displays the lamp points according to the corresponding strategy, finally achieves the effect that each frame of image only lights part of the lamp points, thereby improving the contrast of image display, ensuring the transition of the color bars of the display image to be more uniform and fine, repairing the condition of low gray level gray jump, effectively solving the problems of excessive difference, jitter, gray jump and the like of the color bars of the LED display screen, and improving the image display effect of the LED display screen.
Specifically, the lamp point display strategy of the embodiment of the present invention includes: and judging whether the decimal part Pj of the selected lamp point P is larger than 0, if so, re-assigning the integral part Pi and the decimal part Pj of the lamp point P, enabling the integral part Pi to be the original integral part Pi plus 1, and enabling the decimal part Pj to be the original decimal part Pj minus N.
If the decimal part Pj of the lamp point P is equal to or less than 0, the lamp point is not lighted. The lamp point display strategy of the invention reassigns the integer part Pi and the decimal part Pj of the lamp point P when the decimal part Pj of the lamp point P is larger than 0, the display after the lamp point is selected in the steps S401 and S402 refers to reassigning the integer part Pi and the decimal part Pj of the selected lamp point and does not light the lamp point.
Taking N-64 as an example, the lamp point display strategy includes: and judging whether the fractional part Pj of the selected lamp point P is greater than 0, if so, making the integer part Pi of the lamp point P equal to the original integer part Pi plus 1, and making the fractional part Pj equal to the original fractional part Pj minus 64.
Assuming that the original integer part Pi of the lamp point P is 1 and the original decimal part Pj is 18, the decimal part Pj satisfies the condition of being greater than 0, the integer part Pi of the lamp point P is 1+ 1-2, and the decimal part Pj of the lamp point P is 18-64-46.
As can be seen from the content of step S30 of the foregoing embodiment, the decimal part Pj of the lamp point P is a numerical value equal to or greater than 0 at the time of the first frame image display, but after this frame image display is completed, the decimal part Pj of the lamp point that is lit is reassigned so that the value of the decimal part Pj in the lamp points of the second and subsequent frame images will appear negative, so that when the value of the appearing decimal part Pj is equal to or less than 0, the lamp point will not be displayed even if it is selected.
After step S401 is executed, the selected lamp point is displayed, so that the integer part Pi and the fractional part Pj of the corresponding lamp point P are re-assigned according to the lamp point display policy, the value of the fractional part Pj of the lamp point P is changed after the step is finished, and S402 is executed by using the changed value.
Specifically, defining a lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, where the lamp point P includes an integer part Pi and a fractional part Pj, and further including:
and judging whether the decimal part Pj of the lamp point P is smaller than 0 and whether the integer part Pi is larger than 0, if so, re-assigning the integer part Pi and the decimal part Pj of the lamp point P, reducing the integer part Pi to the original integer part Pi by 1, and adding N to the decimal part Pj.
This part of the content may be referred to as a negative value processing performed when the decimal part Pj of the lamp point P is a negative value, and it is required that the decimal part Pj is less than 0 (the decimal part Pj is a negative number) and the integer part Pi is greater than 0 (when the gray scale is 0 to 255, the integer part Pi is 1, 2, 3), the integer part Pi is equal to the original integer part Pi minus 1, and the decimal part Pj is equal to the original decimal part Pj plus N.
On the basis of the above embodiment, the present invention divides the LED display screen into a plurality of unit blocks of m × m light points according to a preset light point division strategy, including: the method comprises the steps that from the first lamp point of the first row of the LED display screen to the last lamp point of the last row of the LED display screen, the full screen of the LED display screen is divided into a plurality of unit blocks, and any lamp point in the LED display screen only belongs to one unit block.
The present invention further includes an embodiment of an LED display screen with improved contrast, as shown in fig. 6, the LED display screen 100 includes a light point dividing module 101, an image obtaining module 102, a gray scale expanding module 103, a display light point selecting module 104, and a display module 105, where:
the light point dividing module 101 is connected with the display light point selecting module 104 and is used for dividing the LED display screen into a plurality of unit blocks of m light points according to a preset light point dividing strategy;
the image acquisition module 102 is connected with the gray scale expansion module 103 and is used for acquiring a gray scale input value of one frame of image;
the gray scale expansion module 103 is connected with the image acquisition module 102 and the display light point selection module 104, and is configured to define a light point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, where the light point P includes an integer part Pi and a fractional part Pj;
a display light point selecting module 104 connected to the light point dividing module 101, the gray scale expanding module 103, and the display module 105, and configured to select and display light points in the cell block; the method comprises the following steps:
selecting the lamp points in a unit block according to the decimal part Pj of the lamp points P and a preset first display lamp point selection strategy from m × m lamp points of the unit block;
in the unit block, selecting the lamp points in the unit block according to the decimal part Pj of the lamp points P and a preset second display lamp point selection strategy;
and the display module 105 is connected with the display lamp point selection module 104 and is used for displaying according to a preset lamp point display strategy when each lamp point is selected.
Specifically, as shown in fig. 7, the display light point selecting module 104 in the LED display screen 100 according to the embodiment of the present invention includes a first display light point selecting unit 1041 and a second display light point selecting unit 1042, where:
a first display light point selecting unit 1041 for sequentially judging whether the decimal part Pj of the light point P in one unit block is greater than N/2; if yes, selecting the lamp point; if not, the lamp point is not selected;
a second display light point selecting unit 1042 for calculating the cell block decimal and block.sum of the decimal parts Pj of m × m light points in the cell block; judging whether the cell block decimal and block.sum are larger than N; if yes, calculating the number of the lamp points to be selected by the unit block, wherein the number of the lamp points is equal to the quotient of the decimal number of the unit block and the block.sum divided by N, and randomly selecting a corresponding number of the lamp points in the unit block according to the number of the lamp points; if not, the lamp point in the unit block is not selected.
According to the LED display screen with the improved contrast, the contrast is improved in the following mode:
step S10: and dividing the LED display screen into a plurality of unit blocks of m lamp points according to a preset lamp point division strategy.
Step S20: the gray scale input value of one frame of image is obtained.
Step S30: and defining the lamp point P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, wherein the lamp point P comprises an integer part Pi and a decimal part Pj. Step S30 specifically includes:
step S301: and acquiring a gray scale input value A of the current frame image of the lamp point P.
Step S302: the integer part Pi is calculated as the quotient of A/N.
Step S303: the fractional part Pj current is calculated as the remainder of A/N.
Step S304: and judging whether the lamp point P has a decimal part Pj.last under the previous frame of image. If there is a fractional part pj.last, step S305 is performed. If there is no decimal part pj.last, step S306 is executed.
Step S305: let fraction Pj equal to Pj current + Pj last;
step S306: let fraction Pj equal Pj current.
Step S40: and selecting and displaying the lamp points in the unit block.
Step S401: in m × m lamp points of a unit block, the lamp points in the unit block are selected according to the decimal part Pj of the lamp points P and a preset first display lamp point selection strategy, and are displayed according to a preset lamp point display strategy. Wherein, the first display lamp point selection strategy is as follows: sequentially judging whether the decimal part Pj of each lamp point P in one unit block is greater than N/2; if yes, selecting the lamp point; if not, the lamp point is not selected.
Step S402: in the unit block, the lamp point in the unit block is selected according to the decimal part Pj of the lamp point P and a preset second display lamp point selection strategy, and is displayed according to the lamp point display strategy. The second display lamp point selection strategy comprises the following steps:
step S4021: and calculating the cell block decimal and block.sum of the cell blocks, wherein the cell block decimal and block.sum are the sum of decimal parts Pj of m lamp points in the cell block.
Step S4022: and judging whether the cell block decimal and block.sum are larger than the gray scale expansion multiple N.
Step S4023: and calculating the number of the lamp points to be selected by the unit block, wherein the number of the lamp points is equal to the quotient of the decimal number of the unit block and the quotient of block.sum divided by the gray scale expansion multiple N.
Step S4024: and randomly selecting a corresponding number of lamp points in the unit block according to the number of the lamp points.
Step S4025: the lamp point in the cell block is not selected.
Step S50: and judging whether all the cell blocks under the current frame image are completely displayed, if not, repeating the step S40 until all the cell blocks are completely displayed.
Wherein, the lamp point display strategy includes: and judging whether the decimal part Pj of the selected lamp point P is larger than 0, if so, re-assigning the integral part Pi and the decimal part Pj of the lamp point P, enabling the integral part Pi to be the original integral part Pi plus 1, and enabling the decimal part Pj to be the original decimal part Pj minus N.
For the implementation of the above method steps, those skilled in the art may refer to several embodiments of the method for improving the contrast of the LED display screen according to the present invention, and details will not be described here.
According to the LED display screen contrast improvement method and the LED display screen provided by the embodiment of the invention, the lamp points of the LED display screen are divided into the unit blocks, the original gray value of the image frame is redefined, the corresponding number of the lamp points are selected in each unit block through the fractional part of the value and the corresponding strategy, the lamp points are displayed according to the corresponding strategy, and finally, the effect that only part of the lamp points are lightened by each frame of image is achieved in a certain mode, so that the contrast of image display is improved, the transition of the color bars of the display image is more uniform and fine, the condition of low gray level gray jump is repaired, the problems of excessive difference, jitter, gray jump and the like of the color bars of the LED display screen are effectively solved, and the image display effect of the LED display screen is improved.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (10)
1. A method for improving the contrast of an LED display screen is characterized by comprising the following steps:
dividing the LED display screen into a plurality of unit blocks of m lamp points according to a preset lamp point division strategy;
acquiring a gray input value of a frame of image;
defining a lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, wherein the lamp point P comprises an integer part Pi and a decimal part Pj;
selecting and displaying the lamp points in the unit block; the method comprises the following steps:
selecting the lamp points in a unit block according to the decimal part Pj of the lamp points P and a preset first display lamp point selection strategy in m × m lamp points of the unit block, and displaying according to the preset lamp point display strategy;
in the unit block, selecting the lamp points in the unit block according to the decimal part Pj of the lamp points P and a preset second display lamp point selection strategy, and displaying according to the lamp point display strategy;
and judging whether all the cell blocks under the current frame image are displayed or not, if not, repeating the previous step, if so, acquiring the gray scale input value of the next frame image, and executing the subsequent steps.
2. The method for improving the contrast ratio of an LED display screen of claim 1, wherein the first display light point selection strategy is as follows:
sequentially judging whether the decimal part Pj of each lamp point P in one unit block is greater than N/2; if so, then
Selecting the lamp point; if not, then
The lamp point is not selected.
3. The method for improving the contrast ratio of the LED display screen according to claim 2, wherein the second display lamp point selection strategy comprises:
calculating the cell block decimal and block.sum of the cell block, wherein the cell block decimal and block.sum are the sum of decimal parts Pj of m lamp points in the cell block;
judging whether the cell block decimal and block.sum are larger than a gray scale expansion multiple N or not; if so, then
Calculating the number of lamp points to be selected by the unit block, wherein the number of the lamp points is equal to the quotient of the decimal number of the unit block and block.sum divided by the gray scale expansion multiple N;
randomly selecting a corresponding number of lamp points in the unit block according to the number of the lamp points; if not, then
The lamp point in the cell block is not selected.
4. The LED display screen contrast enhancement method of claim 3, wherein the light point display strategy comprises:
and judging whether the decimal part Pj of the selected lamp point P is larger than 0, if so, re-assigning the integral part Pi and the decimal part Pj of the lamp point P, enabling the integral part Pi to be the original integral part Pi plus 1, and enabling the decimal part Pj to be the original decimal part Pj minus N.
5. The method for improving the contrast ratio of the LED display screen according to claim 4, wherein the lamp point P is defined as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, and the lamp point P includes an integer part Pi and a fractional part Pj, further comprising:
and judging whether the decimal part Pj of the lamp point P is smaller than 0 and whether the integer part Pi is larger than 0, if so, re-assigning the integer part Pi and the decimal part Pj of the lamp point P, reducing the integer part Pi to the original integer part Pi by 1, and adding N to the decimal part Pj.
6. The method for improving the contrast ratio of the LED display screen as claimed in claim 5, wherein the defining the lamp point P according to the preset gray scale expansion strategy and the preset gray scale expansion multiple N in the strategy, the lamp point P including an integer part Pi and a fractional part Pj, comprises:
acquiring a gray level input value A of a current frame image of a lamp point P;
calculating the quotient of integer part Pi as A/N;
calculating the remainder of the A/N of the current in the decimal part Pj;
judging whether the lamp point P has a decimal part Pj.last under the previous frame of image; if yes, making the decimal part Pj equal to Pj. If not, the decimal part Pj is made equal to Pj.
7. The method for improving the contrast of the LED display screen according to any one of claims 1 to 6, wherein the dividing the LED display screen into a plurality of unit blocks with m lamp points according to the predetermined lamp point division strategy comprises:
the method comprises the steps that from the first lamp point of the first row of the LED display screen to the last lamp point of the last row of the LED display screen, the LED display screen is divided into a plurality of unit blocks in a full screen mode, and any lamp point in the LED display screen only belongs to one unit block.
8. The method for improving the contrast ratio of the LED display screen as claimed in claim 7, wherein the gray scale expansion multiple N is 2, 4, 8, 16, 64 or 128.
9. The utility model provides a LED display screen that contrast promotes, its characterized in that, LED display screen includes that lamp point divides module, image acquisition module, grey level and expands module, shows that lamp point selects module and display module, wherein:
the lamp point dividing module is connected with the display lamp point selecting module and used for dividing the LED display screen into a plurality of unit blocks of m lamp points according to a preset lamp point dividing strategy;
the image acquisition module is connected with the gray level expansion module and is used for acquiring a gray level input value of one frame of image;
the gray scale expansion module is connected with the image acquisition module and the display lamp point selection module and used for defining a lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N in the strategy, wherein the lamp point P comprises an integer part Pi and a decimal part Pj;
the display lamp point selection module is connected with the lamp point division module, the gray scale expansion module and the display module and is used for selecting and displaying the lamp points in the unit block; the method comprises the following steps:
selecting the lamp points in a unit block according to the decimal part Pj of the lamp points P and a preset first display lamp point selection strategy from m × m lamp points of the unit block;
in the unit block, selecting the lamp points in the unit block according to the decimal part Pj of the lamp points P and a preset second display lamp point selection strategy;
and the display module is connected with the display lamp point selection module and is used for displaying according to a preset lamp point display strategy when each lamp point is selected.
10. The LED display screen of claim 9, wherein the display light point selection module comprises a first display light point selection unit and a second display light point selection unit, wherein:
the first display lamp point selection unit is used for sequentially judging whether the decimal part Pj of the lamp points P in one unit block is greater than N/2; if yes, selecting the lamp point; if not, the lamp point is not selected;
the second display lamp point selecting unit is used for calculating the cell block decimal and block.sum of the cell block, wherein the cell block decimal and block.sum are the sum of decimal parts Pj of m lamp points in the cell block; judging whether the cell block decimal and block.sum are larger than N; if yes, calculating the number of the lamp points to be selected by the unit block, wherein the number of the lamp points is equal to the quotient of the decimal number of the unit block and the quotient obtained by dividing block.sum by N, and randomly selecting a corresponding number of the lamp points in the unit block according to the number of the lamp points; if not, the lamp point in the unit block is not selected.
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