CN114299857B - LED display screen multilayer correction method and device and computer equipment - Google Patents
LED display screen multilayer correction method and device and computer equipment Download PDFInfo
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Abstract
The invention relates to a multilayer correction method and device for an LED display screen and computer equipment, wherein the method comprises the following steps: storing a plurality of sets of correction coefficients in a receiving card in advance according to a preset storage strategy, wherein each set of correction coefficients corresponds to a gray level segmentation range; determining a gamma value of each lamp point to be corrected according to the gray scale of each lamp point to be corrected and a preset gamma table, and determining a gray scale segmentation range of a correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected; determining and reading the correction coefficient of each lamp point to be corrected according to the lamp point color of each lamp point to be corrected and the gray scale segmentation range of the required correction coefficient; and correcting the LED display screen according to the correction coefficient of each lamp point to be corrected. The method, the device and the computer equipment provided by the invention can improve the reading efficiency of the correction coefficient, further improve the correction efficiency, determine the proper correction coefficient and improve the correction effect.
Description
Technical Field
The present invention relates to the field of correction of LED display screens, and in particular, to a method and apparatus for correcting multiple layers of LED display screens, and a computer device.
Background
The LED display screen can be composed of a plurality of boxes, the brightness difference exists in the lamp points in each box, the brightness correction is needed to be carried out on the LED display screen through the correction coefficients, a layered correction mode (multi-layer correction) can be used at this time, a plurality of sets of correction coefficients exist in the multi-layer correction, the correction is described by 4 layers of correction, and the 4 layers of correction involve processing of the 4 sets of correction coefficients.
However, in any moment, only 1 correction coefficient is needed for each lamp point to be corrected, if the correction coefficients in all layers (i.e. 4 sets of correction coefficients in the case of 4-layer correction) are stored in SDRAM or DDR of the receiving card, and then when correction is needed, the correction coefficients in all layers are read out from SDRAM or DDR of the receiving card, at this time, the cost is very high, i.e. the reading efficiency is reduced.
It can be seen that the storage format and the reading mode of the correction coefficient in external storage (SDRAM or DDR of the receiving card) will greatly affect the reading efficiency; therefore, the present invention needs to find a new solution to the above problems.
Disclosure of Invention
Aiming at the problems, the invention provides a multi-layer correction method and device for an LED display screen and computer equipment, and the reading efficiency of correction coefficients is improved.
The invention provides a multilayer correction method for an LED display screen, which comprises the following steps: storing a plurality of sets of correction coefficients in a receiving card in advance according to a preset storage strategy, wherein each set of correction coefficients corresponds to a gray level segmentation range; the preset storage strategy comprises the following steps: for each set of correction coefficients, the correction coefficients corresponding to the lamp points are stored separately according to the colors of the lamp points;
the gray scale of each lamp point to be corrected is obtained, the gamma value of each lamp point to be corrected is determined according to the gray scale of each lamp point to be corrected and a preset gamma table, and the gray scale segmentation range of the correction coefficient required by each lamp point to be corrected is determined according to the gamma value of each lamp point to be corrected;
determining and reading the correction coefficient of each lamp point to be corrected according to the lamp point color of each lamp point to be corrected and the gray scale segmentation range of the required correction coefficient;
and correcting the LED display screen according to the correction coefficient of each lamp point to be corrected.
Further, determining the gray scale segmentation range of the correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected includes:
comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segmentation range, and determining the gamma value range of each lamp point to be corrected;
and determining a gray level segmentation range corresponding to the gamma value range of the gamma value of each lamp point to be corrected as a gray level segmentation range of the correction coefficient required by each lamp point to be corrected.
Further, the gamma value range corresponding to each gray level segment range includes a red light gamma value range, a green light gamma value range and a blue light gamma value range, and comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segment range includes:
selecting a gamma value range corresponding to the color of each lamp point to be corrected from the red lamp gamma value range, the green lamp gamma value range and the blue lamp gamma value range as a target gamma value range; and comparing the gamma value of each lamp point to be corrected with the target gamma value range of the lamp point to be corrected in different gray level segmentation ranges.
Further, storing a plurality of sets of correction coefficients in the receiving card in advance according to a preset storage strategy is as follows:
and storing a plurality of sets of correction coefficients in the synchronous dynamic random access memory in the receiving card in advance according to a preset storage strategy.
Further, the preset storage strategy further includes:
and storing correction coefficients corresponding to the lamps with the same lamp color into a synchronous dynamic random access memory in the receiving card according to the arrangement sequence of the lamps in the LED display screen.
Further, the gray level segmentation range is preset according to a first segmentation strategy or a second segmentation strategy, wherein:
the first segmentation strategy comprises: acquiring a plurality of preset gray level threshold values, determining a plurality of gamma value ranges according to gamma threshold values corresponding to the gray level threshold values, and taking the gray level range corresponding to each gamma value range as a preset gray level segmentation range;
the second segmentation strategy comprises:
a plurality of preset gray level thresholds are obtained, one target gray level is selected between two adjacent gray level thresholds in advance, a plurality of target gray levels are determined, a plurality of gamma value ranges are determined according to gamma threshold values corresponding to each target gray level, and a gray level range corresponding to each gamma value range is used as a preset gray level segmentation range.
Further, the correction coefficient of the target gray scale is obtained according to a preset interpolation processing strategy, wherein the preset interpolation processing strategy comprises:
and determining the correction coefficient corresponding to the target gray level between the two adjacent gray level threshold values according to the gamma value and the correction coefficient corresponding to the two adjacent gray level threshold values and the gamma value corresponding to the target gray level between the two adjacent gray level threshold values.
The invention also provides a device for correcting the LED display screen in multiple layers, which comprises: the device comprises a storage module, a gray level segmentation range determination module, a correction coefficient determination module and a correction module, wherein:
the storage module is connected with the gray level segmentation range determining module and is used for storing a plurality of sets of correction coefficients in the receiving card in advance according to a preset storage strategy, and each set of correction coefficients corresponds to one gray level segmentation range; the preset storage strategy comprises the following steps: for each set of correction coefficients, the correction coefficients corresponding to the lamp points are stored separately according to the colors of the lamp points;
the gray scale segmentation range determining module is connected with the correction coefficient determining module and is used for obtaining the gray scale of each lamp point to be corrected, determining the gamma value of each lamp point to be corrected according to the gray scale of each lamp point to be corrected and a preset gamma table, and determining the gray scale segmentation range of the correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected;
the correction coefficient determining module is connected with the correction module and is used for determining and reading the correction coefficient of each lamp point to be corrected according to the lamp point color of each lamp point to be corrected and the gray scale segmentation range of the required correction coefficient;
and the correction module is used for carrying out correction processing on the LED display screen according to the correction coefficient of each lamp point to be corrected.
Further, the gray level segmentation range determining module determines the gray level segmentation range of the correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected, including:
comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segmentation range, and determining the gamma value range of each lamp point to be corrected;
and determining a gray level segmentation range corresponding to the gamma value range of the gamma value of each lamp point to be corrected as a gray level segmentation range of the correction coefficient required by each lamp point to be corrected.
The invention also provides a computer device which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the LED display screen multilayer correction method when executing the computer program.
The invention provides a multilayer correction method and device for an LED display screen and computer equipment, which at least comprise the following beneficial effects:
according to the multi-layer correction method, the device and the computer equipment for the LED display screen, when the multi-layer correction of the LED display screen is carried out, a plurality of sets of correction coefficients in the multi-layer correction are stored in advance, for each set of correction coefficients, the correction coefficients corresponding to the lamp points are stored separately according to the lamp point colors, when the lamp points to be corrected are required to be corrected subsequently, the gray scale segmentation range corresponding to the correction coefficients required by the lamp points to be corrected is determined first, then the correction coefficients of each lamp point to be corrected are determined and read according to the lamp point colors and gray scales of the lamp points to be corrected, and the LED display screen is corrected according to the correction coefficients of each lamp point to be corrected.
In addition, when the correction coefficient of the lamp point to be corrected is read, the correction coefficient of the lamp point to be corrected is determined according to the lamp point color and gray level of the lamp point to be corrected and the gray level segmentation range corresponding to the correction coefficient required by the lamp point to be corrected, so that the determined correction coefficient meets the correction requirement of the lamp point to be corrected, and the correction effect can be ensured.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a multi-layer calibration procedure for an LED display screen in an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a gray level segment range determining step according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a multi-layer calibration device for an LED display screen according to an embodiment of the present invention;
FIG. 4 is a flow chart of a computer device in one embodiment of the invention.
501-a storage module, 502-a gray scale segmentation limit determination module, 503-a correction coefficient determination module, 504-a correction module, 6-a computer device, 601-a processor, 602-a memory.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In one embodiment of the invention, a method for correcting multiple layers of an LED display screen is disclosed, as shown in FIG. 1, and comprises the following steps:
step S101: and storing a plurality of sets of correction coefficients in the receiving card in advance according to a preset storage strategy, wherein each set of correction coefficients corresponds to a gray level segmentation range.
In one implementation manner of this step, a plurality of sets of correction coefficients are stored in the receiving card in advance according to a preset storage policy, where the correction coefficients are: and storing a plurality of sets of correction coefficients in Synchronous Dynamic Random Access Memory (SDRAM) in the receiving card in advance according to a preset storage strategy. Further, the data is stored in SDRAM row of the receiving card.
That is, in this implementation, the correction coefficients are stored in synchronous dynamic random access memory in the receiving card, rather than in flash memory (flash) of the receiving card.
Specifically, in one implementation, the preset storage policy includes: and for each set of correction coefficients, the correction coefficients corresponding to the lamp points are stored separately according to the colors of the lamp points.
In the LED display screen, each pixel includes 3 light points (R/G/B light points), and each light point has a corresponding correction coefficient, that is, each pixel point has 3 correction coefficients (red light correction coefficient, blue light correction coefficient, and green light correction coefficient).
For brightness correction, since correction is required for all pixels (i.e., all light points) in the LED display screen, each set of correction coefficients includes correction coefficients corresponding to all pixels in the LED display screen. For the correction of the seam repair, the seam repair correction is only required to be performed on the pixel points at the positions with the bright and dark line problem in the LED display screen, and the rest pixel points do not need to be performed on the seam repair correction, so that each set of correction coefficients only comprises the correction coefficients corresponding to the pixel points needing the seam repair correction.
Further, the separate storage of each set of correction coefficients means that the correction coefficients of each pixel point are divided into 3 parts (corresponding to R/G/B light points respectively), and are stored according to colors (that is, red correction coefficients, blue correction coefficients and green correction coefficients of each pixel point are stored together).
Where each correction coefficient may be 32 bits or 22 bits (including 1 main coefficient and 2 small coefficients, 32 bits is composed of 12bit main coefficient+10 bit small coefficient, and 22 bits is composed of 8bit main coefficient+6 bit small coefficient) when stored, it should be understood that the above is only illustrated by a more common bit number and is not a limitation of the present invention.
The correction coefficients of each pixel are divided into 3 parts and stored separately according to colors, and the reading efficiency is very high for 32bit SDRAM (all the required correction coefficients can be read out every time of reading, and no or only part of the unnecessary correction coefficients can be read out).
Further, in yet another implementation manner, the preset storage policy further includes, based on the preset storage policy, the following steps: and storing correction coefficients corresponding to the lamp points of the same lamp point color according to the arrangement sequence of the lamp points in the LED display screen.
That is, the correction coefficient arrangement stored in the SDRAM row of the receiving card is RRR … RR, GG … GGG, BB … BBB, and the light points corresponding to the adjacent two correction coefficients are also adjacent on the LED display screen. Since the correlation between adjacent display data in the normal video is high, in this embodiment, when the correction coefficients of adjacent lamps are put together and then the lamp correction coefficients are read, the reading efficiency is high for the 32-bit SDRAM, and when the correction coefficient required by a certain lamp to be corrected is read for the 64-bit SDRAM, even if the correction coefficient adjacent to the required correction coefficient of the lamp to be corrected is also read, the correction coefficient which is read out is the correction coefficient required by the lamp to be corrected adjacent to the lamp to be corrected, so the implementation can also improve the reading efficiency for the 64-bit SDRAM.
Further, the gray level segmentation range is preset according to the first segmentation strategy or the second segmentation strategy.
The first preset segmentation strategy comprises the following steps: acquiring a plurality of preset gray level thresholds, determining a plurality of gamma value ranges according to gamma threshold values corresponding to the gray level thresholds, and taking the gray level range corresponding to each gamma value range as a preset gray level segmentation range.
Specifically, a plurality of gamma value ranges are determined according to gamma threshold values corresponding to each gray level threshold value, namely, a range formed by two adjacent gamma threshold values is used as one gamma value range, so that a plurality of gamma value ranges are obtained.
Specifically, a plurality of gray level threshold values can be preset by a technician according to actual needs, so that a plurality of gray level segmentation ranges are determined, the actual needs refer to the display picture quality requirements of the display screen, and in multi-layer correction, the higher the display picture quality requirements are, the more the number of gray level segmentation ranges are, so that the higher the number of gray level threshold values is.
After the gray level segmentation ranges are set, a set of correction coefficients corresponding to each gray level segmentation range is set, and then step S101 is executed.
The second preset segmentation strategy comprises:
a plurality of preset gray level thresholds are obtained, one target gray level is selected between two adjacent gray level thresholds in advance, a plurality of target gray levels are determined, a plurality of gamma value ranges are determined according to gamma threshold values corresponding to each target gray level, and a gray level range corresponding to each gamma value range is used as a preset gray level segmentation range.
Further, the correction coefficient of the target gray scale is obtained according to a preset interpolation processing strategy, wherein the preset interpolation processing strategy comprises:
and determining the correction coefficient corresponding to the target gray level between the two adjacent gray level threshold values according to the gamma value and the correction coefficient corresponding to the two adjacent gray level threshold values and the gamma value corresponding to the target gray level between the two adjacent gray level threshold values.
Further, according to the gamma value and the correction coefficient corresponding to the two adjacent gray-scale threshold values and the gamma value corresponding to the target gray-scale between the two adjacent gray-scale threshold values, the correction coefficient corresponding to the target gray-scale between the two adjacent gray-scale threshold values is determined, that is, the correction coefficient of the target gray-scale is calculated by adopting a linear interpolation processing method. Of course, other interpolation methods may be used to calculate the correction coefficient of the target gray level, which is not limited in the present invention.
Taking two adjacent gray-scale threshold values as C0 and C1 as an example, if the gamma value corresponding to C0 is a0, the correction coefficient is C0; c1, and C0 and C1, and C2, and calculating the correction coefficient C2 corresponding to the target gray scale by using a linear interpolation processing method, where C1 is the correction coefficient C1:
in addition, the correction coefficient of the target gray level may be calculated according to the following weight value calculation method:
taking two adjacent gray-scale threshold values as C0 and C1 as an example, if the gamma value corresponding to C0 is a0, the correction coefficient is C0; c1, C0 and C1, and C2, and calculating the correction coefficient C2 corresponding to the target gray scale by using a weight value method as follows:
according to the formula c2=w1×c0+w2×c1, a correction coefficient C2 of the target gray scale is calculated, where w1 and w2 are weight values.
According to the following:
w1+w2=1, and w1, w2 are calculated.
Step S102: the gray scale of each lamp point to be corrected is obtained, the gamma value of each lamp point to be corrected is determined according to the gray scale of each lamp point to be corrected and a preset gamma table, and the gray scale segmentation range of the correction coefficient required by each lamp point to be corrected is determined according to the gamma value of each lamp point to be corrected.
In this step, the gray scale of each lamp point to be corrected is obtained by the following method: and acquiring an image displayed by the LED display screen, and determining the gray scale of each lamp point to be corrected according to the displayed image.
In this step, the gamma table is preset by a technician according to the screen situation and the requirement, and in the gamma table, each gray level can correspondingly have a determined gamma value for adjusting the display effect of the display screen.
Further, each gray level segment range corresponds to a gamma value range, wherein the corresponding relationship between the gamma value range and the gray level segment range is preset, and as shown in fig. 2, determining the gray level segment range of the correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected includes the following steps:
step S201: comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segmentation range, and determining the gamma value range of each lamp point to be corrected;
specifically, each gray level segment range corresponds to a gamma value range, in this step, the gamma value (which may be understood as the brightness response under the gray level) of each lamp point to be corrected may be compared with the threshold value (the threshold value of the gamma value range includes the brightness maximum value and the brightness minimum value) of the gamma value range corresponding to each gray level segment range, so as to determine the gamma value range of each lamp point to be corrected.
Further, the gamma value range corresponding to each gray level segment range includes a red light gamma value range, a green light gamma value range and a blue light gamma value range, and comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segment range includes:
selecting a gamma value range corresponding to the color of each lamp point to be corrected from the red lamp gamma value range, the green lamp gamma value range and the blue lamp gamma value range as a target gamma value range; and comparing the gamma value of each lamp point to be corrected with the target gamma value range of the lamp point to be corrected in different gray level segmentation ranges.
That is, if the color of the lamp to be corrected is red, the gamma value range of the red lamp is used as the target gamma value range of the lamp to be corrected, and the gamma value of the lamp to be corrected is respectively compared with the gamma value ranges of the red lamp corresponding to different gray level segmentation ranges.
Step S202: and determining a gray level segmentation range corresponding to the gamma value range of the gamma value of each lamp point to be corrected as a gray level segmentation range of the correction coefficient required by each lamp point to be corrected.
Because each gray level segmentation range has a corresponding gamma value range, when the gamma value range of each lamp point to be corrected is determined, the corresponding gray level segmentation range can be determined according to the gamma value range.
Step S103: determining and reading the correction coefficient of each lamp point to be corrected according to the lamp point color of each lamp point to be corrected and the gray scale segmentation range of the required correction coefficient;
specifically, in this step, according to the light point color of each light point to be corrected and the gray scale segmentation range of the required correction coefficient, the correction coefficient of each light point to be corrected is determined and read as follows: and determining a set of correction coefficients according to the gray scale segmentation range of the correction coefficients required by the lamp points to be corrected, and determining and reading the coefficients to be corrected of the lamp points to be corrected from the determined set of correction coefficients according to the lamp point colors of the lamp points to be corrected. Specifically, a set of correction coefficients is determined according to a gray level segmentation range of the correction coefficients required by the lamp points to be corrected, in fact, a corresponding gamma value range is determined according to the gray level segmentation range of the correction coefficients required by the lamp points to be corrected, and then a set of correction coefficients corresponding to the gamma value range is determined according to the gamma value range. And then according to the gamma value and the color of the lamp point to be corrected, determining a correction coefficient corresponding to the gamma value of the lamp point to be corrected from the set of correction coefficients.
Step S104: and correcting the LED display screen according to the correction coefficient of each lamp point to be corrected.
In this embodiment, when performing multi-layer correction of the LED display screen, each set of correction coefficients of the multi-layer correction is used to separately store the correction coefficients corresponding to the light points according to the color of the light points, and when subsequently correcting the light points to be corrected, only the correction coefficients required by the light points to be corrected are read, and other unnecessary correction coefficients are not read, so that the reading efficiency is improved, and the correction efficiency of the LED display screen is further improved. For example, for storing 4 sets of correction coefficients, 1/4 of the valid data (i.e., one set of 4 sets of correction coefficients) can always be read out, and the total efficiency is 64/74=86% (since SDRAM row stores 256 lines of correction coefficients, only 64 lines of correction coefficients are read at a time, where 256 lines of correction coefficients correspond to 256 gray levels), and the efficiency is still at a higher level.
In addition, when the correction coefficient of the lamp point to be corrected is read, the correction coefficient of the lamp point to be corrected is determined according to the lamp point color of the lamp point to be corrected and the gray scale segmentation range corresponding to the correction coefficient required by the lamp point to be corrected, so that the determined correction coefficient meets the correction requirement of the lamp point to be corrected, and the correction effect can be ensured.
The invention also provides a device for correcting the LED display screen in multiple layers, as shown in fig. 3, the device comprises: a storage module 501, a gray level segmentation limit determination module 502, a correction coefficient determination module 503, and a correction module 504, wherein:
the storage module 501 is connected with the gray level segmentation range determining module and is used for storing a plurality of sets of correction coefficients in the receiving card in advance according to a preset storage strategy, wherein each set of correction coefficients corresponds to one gray level segmentation range; the preset storage strategy comprises the following steps: for each set of correction coefficients, the correction coefficients corresponding to the lamp points are stored separately according to the colors of the lamp points;
the gray scale segmentation range determining module 502 is connected with the correction coefficient determining module 503, and is configured to obtain gray scale of each lamp point to be corrected, determine a gamma value of each lamp point to be corrected according to the gray scale of each lamp point to be corrected and a preset gamma table, and determine a gray scale segmentation range of a correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected;
the correction coefficient determining module 503 is connected to the correction module 504, and is configured to determine and read the correction coefficient of each lamp point to be corrected according to the lamp point color of each lamp point to be corrected and the gray scale segmentation range of the required correction coefficient;
and the correction module 504 is used for carrying out correction processing on the LED display screen according to the correction coefficient of each lamp point to be corrected.
In still another embodiment of the present invention, the gray scale segment range determining module 502 determines the gray scale segment range of the correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected, including:
comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segmentation range, and determining the gamma value range of each lamp point to be corrected;
and determining a gray level segmentation range corresponding to the gamma value range of the gamma value of each lamp point to be corrected as a gray level segmentation range of the correction coefficient required by each lamp point to be corrected.
According to the LED display screen multilayer correction device, each set of correction coefficients of the multilayer correction is stored separately according to the color of the lamp point, only the correction coefficients required by the lamp point to be corrected are read when the lamp point to be corrected is corrected subsequently, and other unnecessary correction coefficients are not read, so that the reading efficiency is improved, the correction efficiency of the LED display screen can be improved, and meanwhile, the correction coefficients of the lamp point to be corrected are determined according to the color of the lamp point to be corrected and the gray scale segmentation range corresponding to the correction coefficients required by the lamp point to be corrected when the correction coefficients of the lamp point to be corrected are read, so that the determined correction coefficients are the correction coefficients meeting the correction requirements of the lamp point to be corrected, and the correction effect can be ensured.
The present invention also provides a computer device 6, as shown in fig. 4, comprising: processor 601 and memory 602, the processor 601 and memory 602 being interconnected and in communication with each other by a communication bus 603 and/or other form of connection mechanism (not shown), the memory 602 storing a computer program executable by the processor 601, the processor 601 executing the computer program when the computing device is running to perform the method in any of the alternative implementations of the embodiments described above.
According to the multi-layer correction method, the device and the computer equipment for the LED display screen, when the multi-layer correction of the LED display screen is carried out, a plurality of sets of correction coefficients in the multi-layer correction are stored in advance, for each set of correction coefficients, the correction coefficients corresponding to the lamp points are stored separately according to the lamp point colors, when the lamp points to be corrected are needed to be corrected subsequently, the gray scale segmentation range corresponding to the correction coefficients needed by the lamp points to be corrected is determined first, then the correction coefficients of each lamp point to be corrected are determined and read according to the lamp point colors of the lamp points to be corrected, and the LED display screen is corrected according to the correction coefficients of each lamp point to be corrected.
In addition, when the correction coefficient of the lamp point to be corrected is read, the correction coefficient of the lamp point to be corrected is determined according to the lamp point color of the lamp point to be corrected and the gray scale segmentation range corresponding to the correction coefficient required by the lamp point to be corrected, so that the determined correction coefficient meets the correction requirement of the lamp point to be corrected, and the correction effect can be ensured.
The terms and expressions used in the description of the present invention are used as examples only and are not meant to be limiting. The terms "first" and "second" used herein in the claims and the specification of the present invention are used for convenience of distinction only and are not intended to limit the present invention in any particular sense. It will be appreciated by those skilled in the art that numerous changes may be made to the details of the above-described embodiments without departing from the underlying principles of the disclosed embodiments. The scope of the invention is, therefore, to be determined only by the following claims, in which all terms are to be understood in their broadest reasonable sense unless otherwise indicated.
Claims (10)
1. A method for multilayer correction of an LED display, the method comprising:
storing a plurality of sets of correction coefficients in a receiving card in advance according to a preset storage strategy, wherein each set of correction coefficients corresponds to a gray level segmentation range; the preset storage strategy comprises the following steps: for each set of correction coefficients, the correction coefficients corresponding to the lamp points are stored separately according to the colors of the lamp points;
the gray scale of each lamp point to be corrected is obtained, the gamma value of each lamp point to be corrected is determined according to the gray scale of each lamp point to be corrected and a preset gamma table, and the gray scale segmentation range of the correction coefficient required by each lamp point to be corrected is determined according to the gamma value of each lamp point to be corrected;
determining and reading the correction coefficient of each lamp point to be corrected according to the lamp point color of each lamp point to be corrected and the gray scale segmentation range of the required correction coefficient;
and correcting the LED display screen according to the correction coefficient of each lamp point to be corrected.
2. The method of claim 1, wherein determining the gray-scale segment range of the correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected comprises:
comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segmentation range, and determining the gamma value range of each lamp point to be corrected;
and determining a gray level segmentation range corresponding to the gamma value range of the gamma value of each lamp point to be corrected as a gray level segmentation range of the correction coefficient required by each lamp point to be corrected.
3. The method of claim 2, wherein the gamma value range corresponding to each gray level segment range includes a red light gamma value range, a green light gamma value range, and a blue light gamma value range, and comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segment range includes:
selecting a gamma value range corresponding to the color of each lamp point to be corrected from the red light gamma value range, the green light gamma value range and the blue light gamma value range as a target gamma value range; and comparing the gamma value of each lamp point to be corrected with the target gamma value range of the lamp point to be corrected in different gray level segmentation ranges.
4. The method for multi-layer correction of an LED display screen according to claim 1, wherein the storing a plurality of sets of correction coefficients in the receiving card in advance according to a preset storage policy is:
and storing a plurality of sets of correction coefficients in the synchronous dynamic random access memory in the receiving card in advance according to a preset storage strategy.
5. The LED display screen multilayer correction method of claim 1, wherein said preset storage strategy further comprises:
and storing correction coefficients corresponding to the lamps with the same lamp color into a synchronous dynamic random access memory in the receiving card according to the arrangement sequence of the lamps in the LED display screen.
6. The LED display screen multilayer correction method of claim 1, wherein the gray scale segmentation range is preset according to a first segmentation strategy or a second segmentation strategy, wherein:
the first segmentation strategy comprises: acquiring a plurality of preset gray level threshold values, determining a plurality of gamma value ranges according to gamma threshold values corresponding to the gray level threshold values, and taking the gray level range corresponding to each gamma value range as a preset gray level segmentation range;
the second segmentation strategy comprises:
a plurality of preset gray level thresholds are obtained, one target gray level is selected between two adjacent gray level thresholds in advance, a plurality of target gray levels are determined, a plurality of gamma value ranges are determined according to gamma threshold values corresponding to each target gray level, and a gray level range corresponding to each gamma value range is used as a preset gray level segmentation range.
7. The LED display screen multilayer correction method of claim 6, wherein said correction factor for said target gray level is obtained according to a preset interpolation strategy, wherein said preset interpolation strategy comprises:
and determining the correction coefficient corresponding to the target gray level between the two adjacent gray level threshold values according to the gamma value and the correction coefficient corresponding to the two adjacent gray level threshold values and the gamma value corresponding to the target gray level between the two adjacent gray level threshold values.
8. A LED display screen multilayer correction device, the device comprising: the device comprises a storage module, a gray level segmentation range determination module, a correction coefficient determination module and a correction module, wherein:
the storage module is connected with the gray level segmentation range determining module and is used for storing a plurality of sets of correction coefficients in the receiving card in advance according to a preset storage strategy, and each set of correction coefficients corresponds to one gray level segmentation range; the preset storage strategy comprises the following steps: for each set of correction coefficients, the correction coefficients corresponding to the lamp points are stored separately according to the colors of the lamp points;
the gray scale segmentation range determining module is connected with the correction coefficient determining module and is used for obtaining the gray scale of each lamp point to be corrected, determining the gamma value of each lamp point to be corrected according to the gray scale of each lamp point to be corrected and a preset gamma table, and determining the gray scale segmentation range of the correction coefficient required by each lamp point to be corrected according to the gamma value of each lamp point to be corrected;
the correction coefficient determining module is connected with the correction module and is used for determining and reading the correction coefficient of each lamp point to be corrected according to the lamp point color of each lamp point to be corrected and the gray scale segmentation range of the required correction coefficient;
and the correction module is used for correcting the LED display screen according to the correction coefficient of each lamp point to be corrected.
9. The LED display screen multilayer correction device of claim 8, wherein the gray scale segment range determination module, according to the gamma value of each light point to be corrected, determines the gray scale segment range of the correction coefficient required by each light point to be corrected, comprising:
comparing the gamma value of each lamp point to be corrected with the gamma value range corresponding to each gray level segmentation range, and determining the gamma value range of each lamp point to be corrected;
and determining a gray level segmentation range corresponding to the gamma value range of the gamma value of each lamp point to be corrected as a gray level segmentation range of the correction coefficient required by each lamp point to be corrected.
10. A computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the LED display screen multilayer correction method steps of any one of claims 1 to 7 when the computer program is executed.
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