CN113327544B - LED display screen contrast improving method based on diagonal display and LED display screen - Google Patents
LED display screen contrast improving method based on diagonal display and LED display screen Download PDFInfo
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- CN113327544B CN113327544B CN202110888960.6A CN202110888960A CN113327544B CN 113327544 B CN113327544 B CN 113327544B CN 202110888960 A CN202110888960 A CN 202110888960A CN 113327544 B CN113327544 B CN 113327544B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/066—Adjustment of display parameters for control of contrast
Abstract
The invention relates to the technical field of LED display, and particularly discloses a diagonal display-based LED display screen contrast improving method and an LED display screen, wherein the method comprises the following steps: dividing the LED display screen into a plurality of unit blocks of 4 × 4 lamppoints, wherein each unit block is divided into four grids of 2 × 2 lamppoints; acquiring a gray input value of a frame of image; defining a lamp point as P, wherein the lamp point P comprises an integer part Pi and a fractional part Pj; and sequentially selecting and displaying the lamp points in the unit block. According to the LED display screen contrast improving method based on diagonal display and the LED display screen, the effect that only part of lamp points are lightened by each frame of image is achieved, so that the contrast of image display is improved, the transition of color bars of a display image is more uniform and fine, the condition of low-gray-scale ash jumping is repaired, the problems of excessive poor color bars, jitter, ash jumping 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 based on diagonal display 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 0.2 cd/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 an LED display screen contrast improving method based on diagonal display and an LED display screen.
The invention discloses a method for improving the contrast of an LED display screen based on diagonal display, which comprises the following steps:
dividing the LED display screen into a plurality of unit blocks of 4 × 4 lamp points according to a preset lamp point division strategy, wherein each unit block is divided into four grids of 2 × 2 lamp points; the lamp points in each grid are respectively marked as P1, P2, P3 and P4, P1 and P4 are marked as mode1, P2 and P3 are marked as mode2, P1 and P4 are in a diagonal relationship, and P2 and P3 are in a diagonal relationship;
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:
in a unit block, calculating the number of first light points to be displayed by each grid according to the decimal part Pj of the light points P and a preset first display number calculation strategy; selecting the light points in the mode1, the mode2 or the grid according to a preset first light point selection strategy and a first light point number in each grid, and displaying according to a preset light point display strategy;
in the unit block, calculating the number of second light points to be displayed by the unit block according to the decimal part Pj of the light points P and a preset second display number calculation strategy; selecting the lamp points in the mode1, the mode2 or the cell block according to a preset second lamp point selection strategy and a second lamp point number in the cell block, and displaying according to a 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, defining the lamp point as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N, where the lamp point P includes an integer part Pi and a decimal 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, enabling the decimal part Pj = Pj current + Pj. If not, let fractional part Pj = Pj.
Further, the light point display strategy comprises:
and judging whether the decimal part Pj of the selected lamp point P is larger than-N, if so, re-assigning values to the integer part Pi and the decimal part Pj of the lamp point P, and enabling the integer part Pi to be equal to the original integer part Pi plus 1 and the decimal part Pj to be equal to 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, where the lamp point P includes an integer part Pi and a decimal part Pj, and further including:
and judging whether the decimal part Pj of the lamp point P is less than 0 and the integer part Pi is greater than 0, if so, re-assigning the decimal part Pj and the integer part Pi of the lamp point P, and enabling the integer part Pi to be equal to the original integer part Pi minus 1 and the decimal part Pj to be equal to the original decimal part Pj plus N.
Further, in a cell block, calculating a first number of light points to be displayed in each grid according to the fractional part Pj of the light points P and a preset first display number calculation strategy, including:
calculating the grid decimal and grid.sum of the grid, wherein the grid decimal and grid.sum are the sum of decimal parts Pj of 2 x 2 lamp points in the grid;
judging whether the grid decimal and grid.sum are greater than N; if not, making the number of the first lamp points zero; if so, then
Let the first number of light points be the quotient of grid decimal and grid.
Further, selecting a light point in mode1, or in mode2, or in the grid according to a preset first light point selection strategy and a first light point number in each grid, includes:
judging whether 2 x 2 light points in the grid exist a decimal part Pj.last under the previous frame of image; if not, then
Calculating mode1.current and mode2. current; current is the sum of the fractional part P1j of lamp point P1 and the fractional part P4j of lamp point P4; current is the sum of the fractional part P2j of lamp point P2 and the fractional part P3j of lamp point P3;
selecting a lamp point according to the size relation between the mode1 current and the mode2 current; wherein:
if mode1 current is greater than mode2 current, then randomly select a lamp point in mode1 based on the first number of lamp points;
if mode1 current is less than mode2 current, then randomly select a lamp point in mode2 based on the first number of lamp points;
if mode1 current equals mode2 current, then randomly selecting lamp points in the grid according to the first number of lamp points;
if so, then
Calculating mode1.last and mode2. last; mode1.last is the sum of the fractional portion of lamp point P1, P1j. last, and the fractional portion of lamp point P4, P4j. last; mode2.last is the sum of the fractional part P2j.last of lamp point P2 and the fractional part P3j.last of lamp point P3;
selecting a lamp point according to the size relation between the mode1.last and the mode2. last; wherein:
if mode1.last is greater than mode2.last, then randomly select a light point in mode1 based on the first number of light points;
if mode1.last is less than mode2.last, then randomly selecting a lamp point in mode2 based on the first number of lamp points;
if mode1.last is equal to mode2.last, then the light points are randomly selected in the grid based on the first number of light points.
Further, in the unit block, calculating a second number of light points to be displayed by the unit block according to the fractional part Pj of the light points P and a preset second display number calculation strategy, including:
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 4 × 4 light points in the cell block;
judging whether the cell block decimal and block.sum are larger than N; if not, making the number of the second lamp points zero; if so, then
Let the second number of light points be the quotient of the cell block fraction and block.sum divided by N.
Further, selecting a light point in mode1, or in mode2, or in the unit block according to a preset second light point selection strategy and a second number of light points in the unit block, includes:
judging whether 4 x 4 lamp points in the unit block exist in a decimal part Pj.last of the previous frame of image; if not, then
Current and mode2sum are calculated; current is the sum of the fractional part P1j of 4 lamp points P1 and the fractional part P4j of 4 lamp points P4 in the cell block; current is the sum of the fractional part P2j of 4 lamp points P2 and the fractional part P3j of 4 lamp points P3 within the cell block;
selecting a lamp point according to the magnitude relation between the current and the current of the mode2 sum; wherein:
current is greater than mode2sum current, then randomly selecting a lamp in mode1 based on the second number of lamps;
current is less than mode2sum current, then randomly selecting a lamp in mode2 based on the second number of lamps;
if the current is equal to the current of mode2sum, randomly selecting lamp points in the cell block according to the second number of lamp points;
if so, then
Calculate mode1sum.last and mode2sum.last; mode1sum, which is the sum of the fractional part P1j.last of 4 lamp points P1 in the unit block and the fractional part P4j.last of 4 lamp points P4; mode2sum.last is the sum of the fractional part P2j.last of 4 lamp points P2 and the fractional part P3j.last of 4 lamp points P3 within the block;
selecting a lamp point according to the size relation between the mode1sum.last and the mode2sum.last; wherein:
if mode1sum.last is greater than mode2sum.last, randomly selecting a lamp point in mode1 according to the first lamp point number;
if mode1sum.last is less than mode2sum.last, randomly selecting a lamp point in mode2 according to the first lamp point number;
if mode1sum.last is equal to mode2sum.last, then the light points are randomly selected in the grid based on the first number of light points.
Further, divide the LED display screen into a plurality of unit blocks of 4 × 4 light points according to a preset light point division strategy, including:
dividing the full screen of the LED display screen into a plurality of unit blocks from a first light point on a first row of the LED display screen to a last light point on a last row of the LED display screen; any one lamp point in the LED display screen only belongs to one grid, and any one grid only belongs to one unit block.
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 4-4 lamp points according to a preset lamp point dividing strategy, and each unit block is divided into four grids of 2-2 lamp points; the lamp points in each grid are respectively marked as P1, P2, P3 and P4, P1 and P4 are marked as mode1, P2 and P3 are marked as mode2, P1 and P4 are in a diagonal relationship, and P2 and P3 are in a diagonal relationship;
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:
in a unit block, calculating the number of first light points to be displayed by each grid according to the decimal part Pj of the light points P and a preset first display number calculation strategy; selecting the light points in mode1, mode2 or the grid according to a preset first light point selection strategy and a first light point number in each grid;
in the unit block, calculating the number of second light points to be displayed by the unit block according to the decimal part Pj of the light points P and a preset second display number calculation strategy; selecting the lamp points in the mode1, the mode2 or the unit block according to a preset second lamp point selection strategy and a second lamp point number in the unit block;
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 the lamp point is selected in each grid; and displaying according to the lamp point display strategy when the lamp point is selected in each unit block.
According to the LED display screen contrast improvement method based on diagonal display and the LED display screen, the light points of the LED display screen are divided into the unit blocks and the grids, the original gray value of an image frame is redefined, the number of the light points to be displayed in each grid and each unit block is calculated through the values of the decimal part and the corresponding strategies, and then partial light points are selected from the light points to be displayed according to the corresponding strategies, so that the effect that only partial light points are lightened by each frame of image is finally achieved, the contrast of image display is improved, the transition of color bars of a 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.
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 steps of a contrast enhancing method for an LED display screen based on diagonal display according to a first 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 based on diagonal display according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating the steps of a contrast enhancing method for an LED display screen based on diagonal display according to a second embodiment of the present invention;
FIG. 4 is a flowchart illustrating steps of a contrast enhancing method for an LED display screen based on diagonal display according to a third embodiment of the present invention;
FIG. 5 is a flowchart illustrating steps of a contrast enhancing method for an LED display screen based on diagonal display according to a fourth embodiment of the present invention;
FIG. 6 is a flowchart illustrating steps of a contrast enhancing method for an LED display screen based on diagonal display according to a fifth embodiment of the present invention;
FIG. 7 is a flowchart illustrating steps of a contrast enhancing method for an LED display screen based on diagonal display according to a sixth embodiment of the present invention;
FIG. 8 is a flowchart illustrating steps of a contrast enhancing method for an LED display screen based on diagonal display according to a seventh embodiment of the present invention;
fig. 9 is a structural composition diagram of an LED display screen with improved contrast according to an 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 based on diagonal display, which comprises the following steps of:
step S10: the LED display screen is divided into a plurality of unit blocks of 4 × 4 light points according to a preset light point division strategy, and each unit block is divided into four grids of 2 × 2 light points.
The method comprises the steps of dividing the light points of a display area in the LED display screen, wherein the divided unit blocks comprise 4 × 4=16 light points, and each grid comprises 2 × 2=4 light points. As shown in fig. 2, the cell block is divided into 2 × 2 grids, and the light points in each grid are respectively denoted as P1, P2, P3, and P4. In the embodiment of the invention, P1 and P4 are marked as mode1, P2 and P3 are marked as mode2, P1 and P4 are in a diagonal relationship, and P2 and P3 are in a diagonal relationship. And the subsequent step of selecting the lamp points to be displayed from the diagonal relation when the lamp point display is carried out. The number of the cell blocks divided in this step is determined based on the number of the lamp spots in the LED display area.
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 grayscale input values of 16 lamp points in the cell block are as follows:
TABLE 1
Step S30: and 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, wherein the lamp point P comprises an integer part Pi and a decimal part Pj.
The integer part Pi in this step is used as a factor for displaying the gray scale value of the lamp point, and the decimal part Pj is used as a factor for determining whether the lamp point is selected for display in the subsequent step. 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, the obtained values are 2, 4, 8, 16, 64, 128, etc., and the embodiment of the present invention is described with 64 being the multiple of the gray scale expansion.
Specifically, as shown in fig. 3, the step S30 includes:
step S301: acquiring a gray level input value A of a current frame image of a lamp point P;
step S302: calculating the quotient of integer part Pi as A/N;
step S303: the fractional part Pj current is calculated as the remainder of A/N.
Through steps S301 to S303, in combination with the grayscale input value example in table 1, the integer part Pi and the fractional part pj are calculated as listed in table 2:
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 fractional part Pj = Pj current + pj.last;
step S306: let fractional part Pj = Pj.
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: selecting and displaying the lamp points in the unit block; the method comprises the following two aspects:
in a first aspect, the selection and display of the light points are performed mainly by the grid in one cell block, as shown in fig. 4, specifically:
step S401: in a unit block, the first number of the lamp points to be displayed in each grid is calculated according to the decimal part Pj of the lamp points P and a preset first display number calculation strategy.
Step S402: and selecting the light points in the mode1, the mode2 or the grid according to a preset first light point selection strategy and a first light point number in each grid, and displaying according to a preset light point display strategy.
The display of the light points in the four grids in one unit block is realized by determining the number of the first light points, selecting the light points in the grids according to the number of the first light points, and displaying the selected light points.
In a second aspect, the selecting and displaying of the light point is performed by using the whole cell block, specifically:
step S403: in the unit block, the second number of the lamp points to be displayed by the unit block is calculated according to the decimal part Pj of the lamp points P and a preset second display number calculation strategy.
Step S404: and selecting the lamp points in the mode1, the mode2 or the cell block according to a preset second lamp point selection strategy and a second lamp point number in the cell block, and displaying according to a lamp point display strategy.
The step is to realize the display of the lamp points in one unit block by determining the number of the second lamp points, then selecting the lamp points in the unit block according to the number of the second lamp points, and then displaying the selected lamp points.
And repeating the steps S401 to S404 until all the unit blocks and the grids in each unit block are traversed.
Step S50: and judging whether all the unit blocks under the current frame image are displayed.
If not, it indicates that the cell block in the frame image has not been traversed, and step S40 is repeated.
If yes, it indicates that all the cell blocks under the current frame image have been displayed, then the gray scale input value of the next frame image is obtained, and steps S30 to S40 are performed to complete the display of 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 light points of the LED display screen into unit blocks and grids, redefines the original gray value of the image frame, calculates the number of the light points to be displayed in each grid and each unit block through the value of a decimal part and a corresponding strategy, and selects part of the light points to display according to the corresponding strategy, thereby finally achieving the effect that each frame of image only lights part of the light points, improving the contrast of image display, ensuring that the transition of the color bars of the displayed image is 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-N, if so, re-assigning values to the integer part Pi and the decimal part Pj of the lamp point P, and enabling the integer part Pi to be equal to the original integer part Pi plus 1 and the decimal part Pj to be equal to the original decimal part Pj minus N. If the fractional part Pj of the lamp point P is less than-N, 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, the display after the lamp point is selected in the steps S402 and S404 refers to reassigning the integer part Pi and the decimal part Pj of the selected lamp point, but not lighting the lamp point.
Taking N =64 as an example, the light point display strategy includes: and judging whether the fractional part Pj of the selected lamp point P is larger than-64, 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 =2 and the original decimal part Pj =29 of the lamp point P, if the decimal part Pj is greater than-64, the integer part Pi =2+1=3 of the lamp point P is made, and the decimal part Pj =29-64= -35 of the lamp point P.
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 less than-N, the lamp point will not be displayed even if it is selected.
Specifically, on the basis of the above embodiment, in step S30 of the embodiment of the present invention, defining a lamp point P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N, where the lamp point P includes an integer part Pi and a fractional part Pj, and further includes:
and judging whether the decimal part Pj of the lamp point P is less than 0 and the integer part Pi is greater than 0, if so, re-assigning the decimal part Pj and the integer part Pi of the lamp point P, and enabling the integer part Pi to be equal to the original integer part Pi minus 1 and the decimal part Pj to be equal to the original decimal part Pj plus N.
This part of the content can be referred to as negative value processing performed when the fractional part Pj of the lamp point P is a negative value, and it is required to satisfy that the fractional part Pj is less than 0 (the fractional 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 =1, 2, 3), so that the integer part Pi is equal to the original integer part Pi minus 1, and the fractional part Pj is equal to the original fractional part Pj plus N.
Specifically, on the basis of the above embodiment, step S401: in a cell block, according to the fractional part Pj of the light points P and a preset first display number calculation strategy, calculating the number of first light points to be displayed in each grid, as shown in fig. 5, specifically including the following steps:
step S4011: grid decimals and grid.sum of the grid are calculated, and the grid decimals and grid.sum are the sum of the fractional parts Pj of 2 x 2 lamp points in the grid.
Take the example listed in table 2, then the grid decimals and grid of the first grid =56+44+10+52= 162; sum =12+14+11+59= 96; sum of grid cells =29+22+40+29=120 of the third grid; sum =22+43+55+4=124 of the grid decimals and grid of the fourth grid.
Step S4012: and judging whether the grid decimal and grid are larger than N. If not, executing step S4013; if yes, go to step S4014.
Step S4013: the number of the first lamp points is made to be zero.
Step S4014: let the first number of light points be the quotient of grid decimal and grid.
The number of first light points of the first grid is equal to 2, the number of first light points of the second grid is equal to 1, the number of first light points of the third grid is equal to 1, and the number of first light points of the fourth grid is equal to 1.
Specifically, on the basis of the above embodiment, step S402 of the present invention: selecting a light point in mode1, or in mode2, or in the grid according to a preset first light point selection strategy and a first light point number in each grid, as shown in fig. 6, specifically including the following steps:
step S4021: judging whether 2 x 2 light points in the grid exist a decimal part Pj.last under the previous frame of image; if the decimal part pj.last of the previous frame image does not exist, it indicates that the frame image is an image displayed in the first frame, step S4022 is executed, and if the decimal part pj.last of the previous frame image exists, it indicates that the frame image is an image in the second frame and the subsequent frames, step S4027 is executed.
Step S4022: calculating mode1.current and mode2. current; current is the sum of the fractional part P1j of lamp point P1 and the fractional part P4j of lamp point P4; current is the sum of the fractional part P2j of lamp point P2 and the fractional part P3j of lamp point P3.
Taking the integer part Pi and the fractional part pj.current of the lamp points in one cell block listed in table 2 as an example, if there is no fractional part pj.last under the previous frame image, then in the first grid, mode1.current =56+52=108, and mode2.current =44+10= 54; in the second grid, mode1 current =12+59=71, mode2 current =14+11= 25; in the third grid, mode1 current =29+29=58, mode2 current =22+40= 62; in the fourth grid, mode1 current =22+4=26, and mode2 current =43+55= 98.
Step S4023: selecting a lamp point according to the size relation between the mode1 current and the mode2 current; wherein: if mode1 current is greater than mode2 current, step S4024 is performed, if mode1 current is less than mode2 current, step S4025 is performed, and if mode1 current is equal to mode2 current, step S4026 is performed.
Step S4024: the lamp points are randomly selected in mode1 based on the first number of lamp points.
Step S4025: then the lamp point is randomly selected in mode2 based on the first number of lamp points.
Step S4026: lamp points are randomly selected in the grid according to the first number of lamp points.
Therefore, for the first grid, if mode1 current is greater than mode2 current, then both the light point P1 and the light point P2 in the grid are selected (the first number of light points in the first grid is equal to 2 through steps S4011 to S4014); for the second grid, if the current is greater than the current of mode2, then the light point P1 or the light point P2 is randomly selected in the grid (the first number of light points in the second grid is equal to 1 through steps S4011 to S4014); for the third grid, if the current of mode1 is less than the current of mode2, then the light point P2 or the light point P3 is randomly selected in the grid (the first number of light points in the third grid is equal to 1 through steps S4011 to S4014); for the fourth grid, if the current of mode1 is less than the current of mode2, then the light point P2 or the light point P3 is randomly selected in the grid (the first number of light points in the fourth grid is equal to 1 through steps S4011 to S4014).
If the calculated mode1 current is equal to mode2 current, then the first number of lamp points in the grid, from among lamp points P1, P2, P3, and P4, is randomly selected.
If there is a decimal part pj.last under the previous frame image, step S4027 is performed.
Step S4027: calculating mode1.last and mode2. last; mode1.last is the sum of the fractional portion of lamp point P1, P1j. last, and the fractional portion of lamp point P4, P4j. last; mode2.last is the sum of the fractional part P2j.last of lamp point P2 and the fractional part P3j.last of lamp point P3.
Here, taking the fractional part Pj listed in table 2 as the fractional part Pj. last under the previous frame image, in the first grid, mode1.last =56+52=108, mode2.last =44+10= 54; in the second grid, mode1.last =12+59=71, mode2.last =14+11= 25; in the third grid, mode1.last =29+29=58, mode2.last =22+40= 62; in the fourth grid, mode1.last =22+4=26, and mode2.last =43+55= 98.
Step S4028: selecting a lamp point according to the size relation between the mode1.last and the mode2. last; wherein:
if mode1.last is greater than mode2.last, then
Randomly selecting a lamp point in mode1 based on the first number of lamp points;
if mode1.last is less than mode2.last, then
Randomly selecting a lamp point in mode2 based on the first number of lamp points;
if mode1.last is equal to mode2.last, then
Lamp points are randomly selected in the grid according to the first number of lamp points.
Therefore, for the first grid, if mode1.last is greater than mode2.last, then both the light point P1 and the light point P2 in the grid are selected (the first number of light points in the first grid is equal to 2 through steps S4011 to S4014); for the second grid, if mode1.last is greater than mode2.last, then randomly select light point P1 or light point P2 in the grid (the number of first light points in the second grid is equal to 1 through steps S4011 to S4014); for the third grid, if mode1.last is smaller than mode2.last, then randomly select light point P2 or light point P3 in the grid (the number of the first light points in the third grid is equal to 1 through steps S4011 to S4014); for the fourth grid, if mode1.last is smaller than mode2.last, then the light point P2 or the light point P3 is randomly selected in the grid (the number of the first light points in the fourth grid is equal to 1 through steps S4011 to S4014).
When the light points in each grid in one unit block are selected through the above steps, the integer part Pi and the decimal part Pj of the light point P are correspondingly obtained according to the light point display strategy during the display, after the completion of the step, the decimal part Pj value of the light point P is changed, and the changed values are used for calculating the steps S403 and S404.
Specifically, on the basis of the above embodiment, step S403: in the unit block, according to the fractional part Pj of the light points P and a preset second display number calculation strategy, calculating the second number of light points to be displayed by the unit block, as shown in fig. 7, specifically including the following steps:
step S4031: sum of cell block fractions Pj of 4 × 4 light dots in the cell block.
Sum =56+44+10+52+12+14+11+59+29+22+40+29+22+43+55+4= 502.
Step S4032: and judging whether the cell block decimal and block.sum are larger than N. If the cell block decimal fraction and block.sum are not greater than N, then step S4033 is performed, and if the cell block decimal fraction and block.sum are greater than N, then step S4034 is performed.
Step S4033: and making the number of the second lamp points be zero.
Step S4034: let the second number of light points be the quotient of the cell block fraction and block.sum divided by N.
By calculation of 502/64=7 … … 54, the number of second light points of the unit block is 7.
Specifically, on the basis of the above embodiment, step S404 of the present invention: selecting the light points in mode1, or in mode2, or in the unit block according to a preset second light point selection strategy and a second light point number in the unit block, as shown in fig. 8, specifically includes the following steps:
step S4041: judging whether 4 x 4 lamp points in the unit block exist in a decimal part Pj.last of the previous frame of image; if the fractional part pj.last of the previous frame image does not exist, it indicates that the frame image is the image displayed in the first frame, step S4042 is executed, and if the fractional part pj.last of the previous frame image exists, it indicates that the frame image is the image of the second frame and the subsequent frame, step S4047 is executed.
Step S4042: current and mode2sum are calculated; current is the sum of the fractional part P1j of 4 lamp points P1 and the fractional part P4j of 4 lamp points P4 in the cell block; current is the sum of the fractional part P2j of 4 lamp points P2 and the fractional part P3j of 4 lamp points P3 within the cell block.
Current =56+52+12+59+29+29+22+4=263, mode2sum current =44+10+14+11+22+40+43+55= 239.
Step S4043: the lamp point is selected according to the magnitude relation between the current and the current of the mode2sum. Wherein: if the current is greater than the current of mode2sum, go to step S4044; if the current is smaller than the current of mode2sum, go to step S4045; if the mode1sum current is equal to the mode2sum current, step S4046 is performed.
Step S4044: the lamp points are randomly selected in mode1 based on the second number of lamp points.
Step S4045: the lamp points are randomly selected in mode2 based on the second number of lamp points.
Step S4046: randomly selecting a lamp point in the cell block according to the second number of lamp points.
Current is greater than mode2sum current for this cell block, so 7 lamps are randomly selected in 4 sets of mode1.
If there is a fractional part pj.last under the previous frame image, step S4047 is performed.
Step S4047: calculate mode1sum.last and mode2sum.last; mode1sum, which is the sum of the fractional part P1j.last of 4 lamp points P1 in the unit block and the fractional part P4j.last of 4 lamp points P4; mode2sum.last is the sum of the fractional part P2j.last of the 4 lamp points P2 and the fractional part P3j.last of the 4 lamp points P3 within the block.
Here, taking the fractional part Pj listed in table 2 as the fractional part Pj. last under the previous frame image, then mode1sum. last =56+52+12+59+29+29+22+4=263, and mode2sum. last =44+10+14+11+22+40+43+55= 239.
Step S4048: lamp points were selected according to the magnitude relationship between mode1sum.last and mode2 sum.last. Wherein:
if the mode1sum.last is greater than the mode2sum.last, step S4044 is executed; if the mode1sum.last is less than the mode2sum.last, step S4045 is executed; if mode1sum.last is equal to mode2sum.last, step S4046 is performed.
I.e., mode1sum. last for the cell block is greater than mode2sum. last, 7 lamp points are randomly selected in 4 sets of mode1.
Through steps S4011 to S4014 and S4021 to S4028, the lamp points to be displayed in the four grids of a unit block are selected, the integer part Pi and the fractional part Pj of the selected lamp point are re-assigned according to the lamp point display strategy of the embodiment of the present invention, then through steps S4031 to S4034 and S4041 to S4048, the lamp points to be displayed in a unit block are selected, the integer part Pi and the fractional part Pj of the selected lamp point are re-assigned according to the lamp point display strategy of the embodiment of the present invention, the lamp points meeting the requirements calculate the corresponding gray values with the final integer part Pi and light up, and the fractional parts Pj of all the lamp points are used as the fractional parts pj.last in the next frame image display process.
Based on the above embodiment, in step S10, the method for dividing the LED display screen into a plurality of unit blocks with 4 × 4 lighting points according to the preset lighting point dividing strategy includes: dividing the full screen of the LED display screen into a plurality of unit blocks from a first light point on a first row of the LED display screen to a last light point on a last row of the LED display screen; any one lamp point in the LED display screen only belongs to one grid, and any one grid only belongs to one unit block.
The present invention further provides an embodiment of an LED display screen with improved contrast, as shown in fig. 9, an 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 4 × 4 light points according to a preset light point dividing strategy, wherein each unit block is divided into four grids of 2 × 2 light points; the lamp points in each grid are respectively marked as P1, P2, P3 and P4, P1 and P4 are marked as mode1, P2 and P3 are marked as mode2, P1 and P4 are in a diagonal relationship, and P2 and P3 are in a diagonal relationship;
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:
in a unit block, calculating the number of first light points to be displayed by each grid according to the decimal part Pj of the light points P and a preset first display number calculation strategy; selecting the light points in mode1, mode2 or the grid according to a preset first light point selection strategy and a first light point number in each grid;
in the unit block, calculating the number of second light points to be displayed by the unit block according to the decimal part Pj of the light points P and a preset second display number calculation strategy; selecting the lamp points in the mode1, the mode2 or the unit block according to a preset second lamp point selection strategy and a second lamp point number in the unit block;
the display module 105 is connected with the display light point selection module 104 and is used for displaying according to a preset light point display strategy when light points are selected in each grid; and displaying according to the lamp point display strategy when the lamp point is selected in each unit block.
The specific method for realizing contrast improvement of the LED display screen according to the embodiment of the present invention can be realized by referring to the embodiment of the method for improving contrast of the LED display screen based on diagonal display according to the present invention, and details thereof are not repeated herein.
According to the method for improving the contrast of the LED display screen based on diagonal display and the LED display screen, the light points of the LED display screen are divided into the unit blocks and the grids, the original gray value of an image frame is redefined, the number of the light points to be displayed in each grid and each unit block is calculated through the values of the decimal part and the corresponding strategies, and then partial light points are selected from the light points to be displayed according to the corresponding strategies, so that the effect that only partial light points are lightened by each frame of image is finally achieved, the contrast of the 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 based on diagonal display is characterized by comprising the following steps:
step S10: dividing the LED display screen into a plurality of unit blocks of 4 × 4 lamp points according to a preset lamp point division strategy, wherein each unit block is divided into four grids of 2 × 2 lamp points; the lamp points in each grid are respectively marked as P1, P2, P3 and P4, P1 and P4 are marked as mode1, P2 and P3 are marked as mode2, P1 and P4 are in a diagonal relationship, and P2 and P3 are in a diagonal relationship;
step S20: acquiring a gray input value of a frame of image;
step S30: 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;
step S40: selecting and displaying the lamp points in the unit block; the method comprises the following steps:
in a unit block, calculating the number of first light points to be displayed by each grid according to the decimal part Pj of the light points P and a preset first display number calculation strategy; selecting the light points in the mode1, the mode2 or the grid according to a preset first light point selection strategy and the first light point number in each grid, and displaying according to a preset light point display strategy;
in the unit block, calculating the number of second light points to be displayed by the unit block according to the decimal part Pj of the light points P and a preset second display number calculation strategy; selecting the lamp points in the mode1, the mode2 or the cell block according to a preset second lamp point selection strategy and the second lamp point number in the cell block, and displaying according to the lamp point display strategy;
step S50: judging whether all the cell blocks under the current frame image are displayed, if not, repeating the previous step S40, if so, acquiring the gray scale input value of the next frame image, and executing the steps S30 to S50.
2. The contrast improvement method for the diagonal-display-based LED display screen as claimed in claim 1, wherein the defining the lamp point as P according to the preset gray scale expansion strategy and the preset gray scale expansion multiple N, 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, enabling the decimal part Pj = Pj current + Pj. If not, let fractional part Pj = Pj.
3. The diagonal display-based LED display screen contrast enhancement method of claim 2, wherein the light point display strategy comprises:
and judging whether the decimal part Pj of the selected lamp point P is larger than-N, if so, re-assigning values to the integer part Pi and the decimal part Pj of the lamp point P, and enabling the integer part Pi to be equal to the original integer part Pi plus 1 and the decimal part Pj to be equal to the original decimal part Pj minus N.
4. The contrast improvement method for the diagonal-display-based LED display screen of claim 3, wherein the lamp point is defined as P according to a preset gray scale expansion strategy and a preset gray scale expansion multiple N, the lamp point P comprises an integer part Pi and a fractional part Pj, and further comprising:
and judging whether the decimal part Pj of the lamp point P is less than 0 and the integer part Pi is greater than 0, if so, re-assigning the decimal part Pj and the integer part Pi of the lamp point P, and enabling the integer part Pi to be equal to the original integer part Pi minus 1 and the decimal part Pj to be equal to the original decimal part Pj plus N.
5. The contrast-improving method for the diagonal-display-based LED display screen of claim 4, wherein the step of calculating the first number of the light points to be displayed in each grid according to the fractional part Pj of the light points P and a preset first display number calculation strategy in one unit block comprises the following steps:
calculating the grid decimal and grid.sum of the grid, wherein the grid decimal and grid.sum are the sum of decimal parts Pj of 2 x 2 lamp points in the grid;
judging whether the grid decimal and grid.sum are greater than N; if not, making the number of the first lamp points zero; if so, then
And the number of the first lamp points is the quotient of the grid decimal and grid.
6. The diagonal display based LED display screen contrast enhancement method of claim 5, wherein the selecting the light points in mode1, or in mode2, or in the grid according to the preset first light point selection strategy and the first light point number in each grid comprises:
judging whether 2 x 2 light points in the grid exist a decimal part Pj.last under the previous frame of image; if not, then
Calculating mode1.current and mode2. current; current is the sum of the fractional part P1j of lamp point P1 and the fractional part P4j of lamp point P4; current is the sum of the fractional part P2j of lamp point P2 and the fractional part P3j of lamp point P3;
selecting a lamp point according to the size relation between the mode1 current and the mode2 current; wherein:
if mode1 current is greater than mode2 current, then randomly selecting a lamp point in mode1 based on the first number of lamp points;
if mode1 current is less than mode2 current, then randomly selecting a lamp point in mode2 based on the first number of lamp points;
if mode1 current is equal to mode2 current, then randomly selecting lamp points in the grid according to the first number of lamp points;
if so, then
Calculating mode1.last and mode2. last; the mode1.last is the sum of the fractional part P1j. last of lamp point P1 and the fractional part P4j. last of lamp point P4; said mode2.last is the sum of the fractional portion of lamp point P2, p2j.last, and the fractional portion of lamp point P3, p3j.last;
selecting a lamp point according to the size relation between the mode1.last and the mode2. last; wherein:
if mode1.last is greater than mode2.last, randomly selecting a lamp point in mode1 according to the first lamp point number;
if mode1.last is less than mode2.last, randomly selecting a lamp point in mode2 according to the first lamp point number;
if mode1.last is equal to mode2.last, then randomly selecting a light point in the grid according to the first number of light points.
7. The contrast-improving method for the diagonal-display-based LED display screen of claim 6, wherein the step of calculating the second number of the lamp points to be displayed by the unit block according to the fractional part Pj of the lamp points P and the preset second display number calculation strategy in the unit block 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 4 × 4 light points in the cell block;
judging whether the cell block decimal and block.sum are larger than N; if not, making the number of the second lamp points zero; if so, then
And the number of the second lamp points is the quotient of the decimal number of the unit blocks and block.sum divided by N.
8. The diagonal display based LED display screen contrast enhancement method of claim 7, wherein the selecting of the light points in mode1, or in mode2, or in the cell block according to the preset second light point selection strategy and the second light point number in the cell block comprises:
judging whether 4 x 4 lamp points in the unit block exist in a decimal part Pj.last of the previous frame of image; if not, then
Current and mode2sum are calculated; current is the sum of the fractional part P1j of 4 lamp points P1 and the fractional part P4j of 4 lamp points P4 in the unit block; current is the sum of the fractional part P2j of 4 lamp points P2 and the fractional part P3j of 4 lamp points P3 in the unit block;
selecting a lamp point according to the magnitude relation between the current and the current of the mode2 sum; wherein:
current is greater than mode2sum current, then randomly selecting a lamp in mode1 based on the second number of lamps;
current is less than mode2sum current, then randomly selecting a lamp in mode2 based on the second number of lamps;
if the current is equal to the current of the mode2sum, randomly selecting lamp points in the cell block according to the second number of the lamp points;
if so, then
Calculate mode1sum.last and mode2sum.last; the mode1sum is the sum of the fractional part P1j.last of 4 lamp points P1 in the unit block and the fractional part P4j.last of 4 lamp points P4; the mode2sum.last is the sum of the fractional part P2j.last of 4 lamp points P2 and the fractional part P3j.last of 4 lamp points P3 in the unit block;
selecting a lamp point according to the size relation between the mode1sum.last and the mode2sum.last; wherein:
if mode1sum.last is greater than mode2sum.last, randomly selecting a lamp point in mode1 according to the first lamp point number;
if mode1sum.last is less than mode2sum.last, randomly selecting a lamp point in mode2 according to the first lamp point number;
if mode1sum.last is equal to mode2sum.last, then lamp points are randomly selected in the grid according to the first number of lamp points.
9. The contrast-improving method for the LED display screen based on the diagonal display as claimed in claim 1, wherein the dividing the LED display screen into a plurality of unit blocks of 4 × 4 light points according to the preset light point dividing strategy comprises:
dividing the full screen of the LED display screen into a plurality of unit blocks from a first light point on a first row of the LED display screen to a last light point on a last row of the LED display screen; any one lamp point in the LED display screen only belongs to one grid, and any one grid only belongs to one unit block.
10. 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 4 × 4 lamp points according to a preset lamp point dividing strategy, and each unit block is divided into four grids of 2 × 2 lamp points; the lamp points in each grid are respectively marked as P1, P2, P3 and P4, P1 and P4 are marked as mode1, P2 and P3 are marked as mode2, P1 and P4 are in a diagonal relationship, and P2 and P3 are in a diagonal relationship;
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:
in a unit block, calculating the number of first light points to be displayed by each grid according to the decimal part Pj of the light points P and a preset first display number calculation strategy; selecting the light points in the mode1, the mode2 or the grid according to a preset first light point selection strategy and the first light point number in each grid;
in the unit block, calculating the number of second light points to be displayed by the unit block according to the decimal part Pj of the light points P and a preset second display number calculation strategy; selecting the lamp points in the mode1, or in the mode2, or in the unit block according to a preset second lamp point selection strategy and the second lamp point number in the unit block;
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 a lamp point is selected in each grid; and the display device is used for displaying according to the lamp point display strategy when the lamp point is selected in each unit block.
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