CN114530119A - Correction coefficient correction method, device and system based on gray scale - Google Patents
Correction coefficient correction method, device and system based on gray scale Download PDFInfo
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- CN114530119A CN114530119A CN202210176129.2A CN202210176129A CN114530119A CN 114530119 A CN114530119 A CN 114530119A CN 202210176129 A CN202210176129 A CN 202210176129A CN 114530119 A CN114530119 A CN 114530119A
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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- 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
- G09G2320/04—Maintaining the quality of display appearance
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Abstract
The invention discloses a correction coefficient correction method, device and system based on gray scale, the method includes: determining a correction coefficient correction model according to the sample box body; determining a correction coefficient difference corresponding to each gray-scale value; determining a target gray scale value within the preset gray scale range according to a preset threshold value and a correction coefficient difference value corresponding to each gray scale value; acquiring an original correction coefficient of a display screen to be corrected in a cold screen state, and taking the original correction coefficient as a target correction coefficient if the gray scale value of a lamp point of the box body is smaller than a target gray scale value; and if the gray scale value of the box body lamp point is larger than or equal to the target gray scale value, taking the sum of the original correction coefficient of the box body lamp point and the correction coefficient correction model as the corrected target correction coefficient. The correction coefficients suitable for various gray scales of the box body can be calculated, the display effect of the screen body at various temperatures can be guaranteed without continuously detecting the temperature change of the screen body, the time is short, and the correction efficiency is high.
Description
Technical Field
The invention relates to the technical field of display screen correction, in particular to a correction coefficient correction method, device and system based on gray scale.
Background
At present, in an LED display screen, the problem of difference of display brightness and chromaticity of a partial display area of the screen body is caused due to uneven temperature distribution of the screen body, and the screen brightness difference is called as a cross line phenomenon in the industry, particularly because an initial correction coefficient is not suitable for a use scene of the current screen body.
In the prior art, a hot screen correction technology or a cold screen correction technology is used for correcting a screen body so as to solve the problem that the screen body has cross lines in a high gray scale section. However, when the method is adopted, aiming at the low gray stage of the screen body, if the correction coefficient corresponding to the high gray scale section is still used, the correction coefficient at the high gray stage is not suitable for correcting the lighting chromaticity of the lamp at the low gray stage, and the display effect of the screen body is greatly reduced; if the correction coefficient corresponding to the screen body in the low gray stage is also calculated in the low gray stage of the screen body, the correction time spent on each box body in the screen body is greatly increased, and the correction efficiency of the box body is seriously reduced.
Therefore, there is a need for a new technical solution to solve the above problems.
Disclosure of Invention
In order to overcome the problems in the related art, the invention discloses a correction coefficient correction method, a correction coefficient correction device and a correction coefficient correction system based on gray scale.
According to a first aspect of the disclosed embodiments of the present invention, there is provided a method for gamma correction based on gray scale, the method comprising:
determining a correction coefficient correction model according to a first correction coefficient of the sample box body in a cold screen state and a second correction coefficient of the sample box body in a hot screen state;
determining a correction coefficient difference value corresponding to each gray scale value according to a third correction coefficient which is determined in a cold screen state and corresponds to each gray scale value in a preset gray scale range of the box body of the display screen to be corrected respectively and a fourth correction coefficient which is determined in a hot screen state and corresponds to each gray scale value in the preset gray scale range of the box body of the display screen to be corrected respectively;
determining a target gray scale value within the preset gray scale range according to a preset threshold value and a correction coefficient difference value corresponding to each gray scale value;
acquiring an original correction coefficient of a box body in a display screen to be corrected in a cold screen state, and taking the original correction coefficient as a target correction coefficient if the gray scale value of the box body is smaller than the target gray scale value;
and if the gray-scale value of the box body is larger than or equal to the target gray-scale value, taking the sum of the original correction coefficient of the box body and the correction coefficient correction model as the corrected target correction coefficient.
Optionally, the determining a correction coefficient correction model according to a first correction coefficient of the sample box in a cold shielding state and a second correction coefficient of the sample box in a hot shielding state includes:
determining a sample box body and a preset gray scale value;
determining a first correction coefficient corresponding to the sample box body under a preset gray scale value in a cold screen state;
determining a second correction coefficient corresponding to the sample box body under a preset gray scale value in a heat shield state;
and taking the absolute value of the difference value between a plurality of first correction coefficients and a plurality of second correction coefficients as the correction coefficient modification model.
Optionally, the preset gray scale range is {1, 2, 3, … …, 255}, and the determining a correction coefficient difference value corresponding to each gray scale value according to a third correction coefficient corresponding to each gray scale value in the preset gray scale range of the box body in the display screen to be corrected determined in the cold screen state and a fourth correction coefficient corresponding to each gray scale value in the preset gray scale range of the box body in the display screen to be corrected determined in the hot screen state includes:
determining a third correction coefficient corresponding to each gray scale value of the box body in the display screen to be corrected in a {1, 2, 3, … …, 255} gray scale range in a cold screen state;
determining a fourth correction coefficient corresponding to each gray scale value of the box body in the display screen to be corrected in a {1, 2, 3, … …, 255} gray scale range in a hot screen state;
and taking the absolute value of the difference obtained by subtracting the fourth correction coefficient from the third correction coefficient corresponding to each gray-scale value as the correction coefficient difference corresponding to the gray-scale value.
Optionally, the determining a target gray scale value within the preset gray scale range according to a preset threshold and a correction coefficient difference corresponding to each gray scale value includes:
determining a correction coefficient difference value corresponding to a gray scale value i, wherein the value of i is increased from 1 to 1 in the range of {1, 2, 3, … …, 255} gray scales;
comparing the correction coefficient difference corresponding to the gray-scale value i with the magnitude relation between the preset threshold values;
if the correction coefficient difference value corresponding to the gray-scale value i is smaller than the preset threshold value, enabling i to be i +1, and repeatedly executing the step from the step of determining the correction coefficient difference value corresponding to the gray-scale value i to the step of comparing the correction coefficient difference value corresponding to the gray-scale value i with the preset threshold value;
and if the difference value of the correction coefficient corresponding to the gray-scale value i is larger than or equal to the preset threshold value, taking the i as the target gray-scale value and stopping traversing.
Optionally, the first temperature value corresponding to the cold screen state is a temperature value of the sample box body and/or the display screen to be corrected at the room temperature;
and the second temperature value corresponding to the heat shield state is the highest temperature value which can be reached by the sample box body and/or the display screen to be corrected in the vacuum state.
Optionally, the method further includes:
determining a display screen to be corrected;
determining a temperature value of the display screen to be corrected at room temperature, and taking the temperature value at room temperature as a first temperature value of the display screen to be corrected in a cold screen state;
and determining the highest temperature value which can be reached by the screen body of the display screen to be corrected in a vacuum state, and taking the highest temperature value as a second temperature value of the display screen to be corrected in a heat shield state.
According to a second aspect of the disclosed embodiments of the present invention, there is provided a gamma correction device based on gray scale, the device comprising:
the correction model determining module is used for determining a correction coefficient correction model according to a first correction coefficient of the sample box body in a cold screen state and a second correction coefficient of the sample box body in a hot screen state;
the difference value determining module is connected with the correction model determining module and determines a correction coefficient difference value corresponding to each gray scale value according to a third correction coefficient which is determined in a cold screen state and corresponds to each gray scale value in a preset gray scale range of the middle box body of the display screen to be corrected respectively and a fourth correction coefficient which is determined in a hot screen state and corresponds to each gray scale value in the preset gray scale range of the middle box body of the display screen to be corrected respectively;
the target gray scale value determining module is connected with the difference value determining module and determines a target gray scale value within the preset gray scale range according to a preset threshold value and the correction coefficient difference value corresponding to each gray scale value;
the original correction coefficient determining module is connected with the target gray scale value determining module, obtains an original correction coefficient of a box body in the display screen to be corrected in a cold screen state, and takes the original correction coefficient as a target correction coefficient if the gray scale value of the box body is smaller than the target gray scale value;
and the correction coefficient correction module is connected with the original correction coefficient determination module, and if the gray-scale value of the box body is greater than or equal to the target gray-scale value, the sum of the original correction coefficient of the box body and the correction coefficient correction model is used as the corrected target correction coefficient.
Optionally, the modified model determining module includes:
the sample box body determining unit is used for determining a sample box body and a preset gray scale value;
the first correction coefficient determining unit is connected with the sample box body determining unit and determines a first correction coefficient corresponding to the sample box body under a preset gray scale value in a cold screen state;
the second correction coefficient determining unit is connected with the first correction coefficient determining unit and determines a second correction coefficient corresponding to the sample box body under a preset gray-scale value in a hot screen state;
and a correction model determining unit connected to the second correction coefficient determining unit, for determining an absolute value of a difference between the plurality of first correction coefficients and the plurality of second correction coefficients as the correction coefficient correction model.
Optionally, the preset gray scale range is {1, 2, 3, … …, 255}, and the difference determining module includes:
the third correction coefficient determining unit is used for determining a third correction coefficient corresponding to each gray scale value of the box body in the display screen to be corrected in a {1, 2, 3, … …, 255} gray scale range in a cold screen state;
the fourth correction coefficient determining unit is connected with the third correction coefficient determining unit and is used for determining a fourth correction coefficient corresponding to each gray-scale value of the box body in the display screen to be corrected in a {1, 2, 3, … …, 255} gray-scale range in the hot screen state;
and the correction coefficient difference determining unit is connected with the fourth correction coefficient determining unit and takes a difference absolute value obtained by subtracting the fourth correction coefficient from the third correction coefficient corresponding to each gray-scale value as a correction coefficient difference corresponding to the gray-scale value.
According to a third aspect of the disclosed embodiments of the present invention, there is provided a gamma correction system based on gray scale, the system comprising: the correction coefficient correction device based on gray scale according to the second aspect of the disclosed embodiment of the present invention, a display screen to be corrected, a sending card and a receiving card;
the correction coefficient modification device based on gray scale is connected with a sending card, the sending card is connected with a receiving card, and the correction coefficient modification device based on gray scale is used for determining a target correction coefficient of each lamp point according to the correction coefficient modification method of the first aspect of the disclosed embodiment of the invention, and then sending the target correction coefficient to the receiving card through the sending card;
and the receiving card is positioned in the display screen to be corrected so as to correct the lamp points in the display screen to be corrected according to the target correction coefficient.
In summary, the present disclosure relates to a method, an apparatus, and a system for correcting a correction coefficient based on gray scale, wherein the method comprises: determining a correction coefficient correction model according to the sample box body; determining a correction coefficient difference corresponding to each gray-scale value; determining a target gray scale value within the preset gray scale range according to a preset threshold value and a correction coefficient difference value corresponding to each gray scale value; acquiring an original correction coefficient of a display screen to be corrected in a cold screen state, and taking the original correction coefficient as a target correction coefficient if the gray scale value of the lamp point of the box body is smaller than a target gray scale value; and if the gray scale value of the box body lamp point is larger than or equal to the target gray scale value, taking the sum of the original correction coefficient of the box body lamp point and the correction coefficient correction model as the corrected target correction coefficient.
The correction coefficients suitable for the box body under various gray scales can be calculated through software according to the box body with the same model, a temperature detection device does not need to be specially installed in the box body to continuously detect the temperature change of the box body and calculate the corresponding correction coefficients, the time spent for calculating the correction coefficients is short, the time required for correction is saved, the correction efficiency is improved, and meanwhile, the display effect of the screen body under various temperatures is also ensured.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a gamma-based correction factor correction method according to an exemplary embodiment;
FIG. 2 is a flow chart of a correction factor modification model determination method according to the one shown in FIG. 1;
FIG. 3 is a flow chart of a correction coefficient difference determination method according to the one shown in FIG. 1;
FIG. 4 is a flow chart of a method for determining a target gray scale value according to the method shown in FIG. 1;
fig. 5 is a block diagram illustrating a structure of a gamma-based correction coefficient correcting apparatus according to an exemplary embodiment;
FIG. 6 is a block diagram of a modified model determination module according to the embodiment shown in FIG. 5;
fig. 7 is a block diagram of a difference determination module according to fig. 5.
Detailed Description
The following detailed description of the disclosed embodiments will be made in conjunction with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart illustrating a gamma correction coefficient modification method according to an exemplary embodiment, as shown in fig. 1, the method including:
in step 101, a correction coefficient modification model is determined according to a first correction coefficient of the sample box body in a cold shielding state and a second correction coefficient of the sample box body in a hot shielding state.
For example, in the embodiment of the present disclosure, before correcting the correction coefficient of the display panel to be corrected, a correction coefficient correction model needs to be established, where the correction coefficient correction model is used to represent a difference between the correction coefficients of the same box in the cold-shielding state and the hot-shielding state. It should be noted that the correction coefficient in the hot-shielding state is different from the correction coefficient in the cold-shielding state in the same box, because the brightness displayed by the lamp in the box decreases as the temperature of the box increases. When the temperature of the box body is higher than the preset temperature threshold, part of the electric energy in the box body for supporting the red lamp to emit light is converted into heat energy (for example, if the red lamp obtains a voltage of 5V for lighting the lamp, but if the temperature of the screen body is too high, only a voltage of 3.8V in the voltage of 5V may be used for lighting the lamp, and the rest of the voltage is converted into heat energy), and the heat energy is dissipated to the outside along the slit in the box body, thereby affecting the brightness of the lamp at the slit in the box body. The correction coefficient in this embodiment may be a luminance correction coefficient.
Fig. 2 is a flowchart of a method for determining a correction coefficient modification model according to fig. 1, and as shown in fig. 2, the step 101 includes:
in step 1011, the sample bin and the preset gray scale value are determined.
In an example, a sample box under a preset gray scale value is selected, a first correction coefficient of the sample box is measured under a cold shielding state, a second correction coefficient of the sample box is measured under a hot shielding state, and a correction coefficient correction model is determined according to the numerical change condition of the correction coefficient of the sample box between the cold shielding state and the hot shielding state. It should be noted that the sample box is selected from a plurality of boxes of the same production lot and the same type, and the production lot and type of the sample box used in this step should be as same as the production lot and type of the box in the display screen to be corrected (which may also be understood as the same type and size of the box) in steps 102-105 described below.
The preset gray scale value can be any gray scale value between 1 and 255, and the preset gray scale value is preferably 255 gray scale in general, because the exposure time of the camera is fastest in a high gray scale state, a picture containing all lamp lighting chromaticity information can be conveniently acquired through the camera.
In addition, the temperature of the sample box in the cold shielding state is a first temperature value, which is the room temperature of the environment where the sample box is currently located, and the temperature of the sample box in the hot shielding state is a second temperature value, which is the highest temperature value (e.g., 50 ℃) that the sample box can reach in an ideal state (which can also be understood as a vacuum state). The maximum temperature value means that when the temperature of the sample box body reaches the maximum temperature value, the sample box body can still work normally, but if the temperature value of the sample box body exceeds the maximum temperature value, the sample box body cannot work continuously. Typically, the maximum temperature value may be obtained in factory information of the sample box.
In step 1012, a first correction factor corresponding to the sample box at a preset gray level is determined in the cold shielding state.
In step 1013, a second correction coefficient corresponding to the sample box at the preset gray-scale value is determined in the heat shield state.
Exemplarily, after a first temperature value corresponding to a cold screen state and a second temperature value corresponding to a hot screen state are determined, a first correction coefficient of a sample box is determined according to a brightness value of a lamp in the sample box and a target brightness value in the cold screen state (i.e., the first temperature value), then the sample box is preheated to a second temperature value corresponding to the hot screen state, at this time, the brightness value of the lamp in the sample box changes due to a change in temperature (the lamp becomes dark in a normal case), and a second correction coefficient of the sample box is determined according to the target brightness value and the brightness value of the lamp in the hot screen state. It can be seen that, in general, the value of the second correction coefficient is larger than the value of the first correction coefficient.
In step 1014, the absolute value of the difference between the plurality of first correction coefficients and the second correction coefficients is used as the correction coefficient modification model.
For example, after the first correction coefficient and the second correction coefficient are determined, the absolute value of the difference between the first correction coefficient and the second correction coefficient is used as the correction coefficient correction model. In addition, in order to improve the accuracy of the correction coefficient correction model, at least one sample box with different production batches and different types can be selected for calculating the correction coefficient correction model. In this case, the first correction coefficient in the cold shielding state and the second correction coefficient in the hot shielding state are also plural, and the absolute values of the differences between the plural first correction coefficients and the plural second correction coefficients are used together as the correction coefficient correction model, whereby the correction coefficient correction model error caused by the individual error between the sample boxes can be further reduced.
In step 102, a correction coefficient difference corresponding to each gray scale value is determined according to a third correction coefficient corresponding to each gray scale value within a preset gray scale range of the middle box body of the display screen to be corrected determined in the cold screen state and a fourth correction coefficient corresponding to each gray scale value within a preset gray scale range of the middle box body of the display screen to be corrected determined in the hot screen state.
For example, the correction coefficient of the box in the display screen to be corrected may change at different temperatures and at different gray scale values, and therefore, in the embodiment of the disclosure, a preset gray scale range is first selected, the box in the display screen to be corrected is adjusted to each gray scale value within the preset gray scale range in the cold-screen state and the hot-screen state, a third correction coefficient in the cold-screen state and a fourth correction coefficient in the hot-screen state corresponding to each gray scale value are obtained, and a correction coefficient difference corresponding to each gray scale value may be determined according to the third gray scale value and the fourth gray scale value, where the correction coefficient difference may be used to represent a change of the correction coefficient of the box along with a change of the temperatures and the gray scale values. When the correction coefficient difference is calculated, one or more boxes in the display screen to be corrected can be selected for calculation. For example, if the models and sizes of the boxes in the display screen to be corrected are the same, only one box can be selected for calculating the correction coefficient difference, and if the models of the boxes in the display screen to be corrected are different, at least one box under each model can be selected for calculating the correction coefficient difference. In addition, the box in the display screen to be corrected and the sample box in the step 1011 described above belong to the same production batch and the same type, that is, the model and the size of the box in the display screen to be corrected and the sample box are the same. When the boxes in the display screen to be calibrated are from different production batches and types, respectively, the sample boxes also include a plurality of boxes from corresponding production batches and types. When the correction coefficient correction in step 105 described below is performed, the original correction coefficient (which is the original correction coefficient from the same production lot and the same type of cassette as the sample cassette) should also be corrected using the correction coefficient correction model calculated for the same production lot and the same type of sample cassette.
Wherein the predetermined gray scale range is 1-255. Generally, the gray scale values of the light point include 256 gray scale values of 0, 1, 2, … …, and 255, and the gray scale values of 1, 2, 3, … …, and 255 are selected in the embodiment of the disclosure, because the light point is completely black when the gray scale value is 0, the calibration coefficient at 0 gray scale does not need to be collected.
Fig. 3 is a flowchart of a method for determining a correction coefficient difference according to fig. 1, where, as shown in fig. 3, the step 102 includes:
in step 1021, a third correction coefficient corresponding to each gray scale value in the {1, 2, 3, … …, 255} gray scale range of the box in the display to be corrected is determined in the cold state.
In step 1022, a fourth correction coefficient corresponding to each gray scale value in the {1, 2, 3, … …, 255} gray scale range of the box in the display to be corrected is determined in the hot state.
Exemplarily, similarly to the step 1011 above, after the display screen to be corrected is determined, according to the temperature value of the display screen to be corrected at room temperature, a first temperature value of the display screen to be corrected in the cold screen state is determined, and then according to a highest temperature value that can be reached by the display screen to be corrected in the vacuum state (the highest temperature value is a critical value of a highest temperature that the display screen to be corrected can normally operate in an ideal state, and if the screen body temperature is higher than the highest temperature value, the display screen to be corrected will not normally operate or fail.
After a first temperature value in a cold screen state and a second temperature value in a hot screen state are determined, firstly, the gray scale of the display screen box body to be corrected is gradually adjusted from 1 to 255 in the cold screen state, and a third correction coefficient under each gray scale is recorded and obtained. Then, the box body in the display screen to be corrected is preheated to a heat shielding state under a second temperature value, the gray scale of the box body is adjusted to 255 from 1 in the heat shielding state, and a fourth correction coefficient under each gray scale is recorded and obtained.
In step 1023, the absolute value of the difference obtained by subtracting the fourth correction coefficient from the third correction coefficient corresponding to each gray-scale value is used as the correction coefficient difference corresponding to the gray-scale value.
Illustratively, the absolute value of the difference between the third coefficient and the fourth coefficient is a correction coefficient difference corresponding to each gray-scale value in {1, 2, 3, … …, 255 }.
In step 103, a target gray level value is determined within the preset gray level range according to a preset threshold and the correction coefficient difference corresponding to each gray level value.
For example, the correction coefficient difference determined by steps 1021 and 1023 is used to determine the gray level value boundary (i.e. the target gray level value) for determining whether the lamp point in the display screen to be corrected needs to be corrected by the correction coefficient. In the embodiment of the present invention, the difference between the correction coefficients is compared with a preset threshold, and if the difference between the correction coefficients is greater than or equal to the preset threshold, it indicates that the difference between the correction coefficients of the lamp points of the box body in the cold-screen state and the correction coefficients of the lamp points of the box body in the hot-screen state is larger under the gray scale value corresponding to the difference between the correction coefficients, and at this time, the correction coefficients of the lamp points of the box body under the gray scale value need to be corrected (corrected by the correction coefficient correction model obtained in the step 101). On the contrary, if the difference value of the correction coefficients is smaller than the preset threshold, it is indicated that the difference between the correction coefficients of the lamp points of the box body in the cold screen state and the correction coefficients of the lamp points of the box body in the hot screen state is smaller, and the difference can be ignored, and at this time, the correction coefficients of the lamp points of the box body in the gray scale state do not need to be corrected, and the correction coefficients in the cold screen state are directly used. For example, if the predetermined threshold is set to 0.01, when the difference between the correction coefficients is lower than 0.01, it indicates that the change of the correction coefficients of the lamp points of the housing in the cold-screen state and the hot-screen state is very small (i.e., the brightness of the lamp points does not change significantly with temperature) and can be ignored, so that no correction is needed, and when the difference between the correction coefficients is greater than or equal to 0.01, the correction coefficients of the lamp points in the gray-scale value are corrected according to the correction coefficient correction model.
Therefore, in the embodiment of the present disclosure, after the correction coefficient difference corresponding to each gray scale value is determined, the gray scale value corresponding to the correction coefficient difference larger than the preset threshold is used as the target gray scale value by traversing the correction coefficient difference until the correction coefficient difference larger than the preset threshold is determined.
Specifically, fig. 4 is a flowchart of a target gray level value determining method shown in fig. 1, and as shown in fig. 4, the step 103 includes:
in step 1031, a correction coefficient difference value corresponding to the gray-scale value i is determined.
Wherein, i takes values from 1 to large in the gray scale range of {1, 2, 3, … …, 255 }.
In step 1032, the magnitude relationship between the correction coefficient difference corresponding to the gray-scale value i and the preset threshold is compared.
In step 1033, if the correction coefficient difference corresponding to the gray level value i is smaller than the preset threshold, let i be i +1 and repeat the steps from determining the correction coefficient difference corresponding to the gray level value i to comparing the correction coefficient difference corresponding to the gray level value i with the preset threshold.
In step 1034, if the difference between the correction coefficients corresponding to the gray level value i is greater than or equal to the preset threshold, then i is used as the target gray level value and the traversal is stopped.
For example, in general, the lamp lighting chromaticity value of the lamp in the high gray scale section changes more significantly as the temperature of the screen increases, while the lamp lighting chromaticity value of the lamp in the low gray scale section changes more slowly as the temperature of the screen increases, that is, for the same box, the correction coefficient difference value increases as the gray scale value increases. Therefore, when comparing the correction coefficient difference values corresponding to different gray-scale values, it is only necessary to gradually traverse the magnitude relationship between the correction coefficient difference value corresponding to each gray-scale value and the preset threshold value from 1 to 255 from a low gray-scale value to a high gray-scale value. For example, let i be 1, compare the relationship between the correction coefficient difference corresponding to the gray-scale value and the preset threshold from i, if the correction coefficient difference is smaller than the preset threshold, let i be i +1, and then continue to compare the relationship between the correction coefficient difference corresponding to the newly assigned i and the preset threshold until it is determined that the correction coefficient difference corresponding to i is greater than or equal to the preset threshold, stop traversing, and take i as the target correction coefficient difference. And if the traversal is started from i-1, and when i-199, the corresponding correction coefficient difference is determined to be larger than the preset threshold, then 199 is determined as the target gray-scale value, and meanwhile, the relationship between the correction coefficient difference and the preset threshold under the gray-scale values of 200-255 does not need to be traversed.
In step 104, an original correction coefficient of the box in the display screen to be corrected is obtained in a cold screen state, and if the gray scale value of the box is smaller than the target gray scale value, the original correction coefficient is used as the target correction coefficient.
For example, the display screen to be corrected includes a plurality of boxes, and therefore, the original correction coefficient corresponding to each box needs to be acquired in a cold screen state. At present, when a display screen to be corrected is corrected, a camera is generally used to shoot an initial brightness image of the whole screen body, and finally, a point-by-point correction method is performed on each lamp point in the display screen to be corrected through the initial brightness image.
After the original correction coefficient is obtained, the gray-scale values of all the lamp points in each box body are judged respectively, when the gray-scale values of the lamp points are smaller than the target gray-scale value, the original correction coefficient is not required to be corrected, and the brightness correction can be directly carried out on the lamp points through the original correction coefficient.
In step 105, if the gray level of the box is greater than or equal to the target gray level, the sum of the original correction coefficient of the box and the correction coefficient correction model is used as the corrected target correction coefficient.
For example, the gray scale value of the box may be understood as the gray scale value of each lamp point in the box, and when the gray scale value of a lamp point in the box is greater than or equal to the target gray scale value, the sum of the original correction coefficient of the lamp point and the correction coefficient correction model is used as the corrected target correction coefficient of the lamp point. Therefore, the relation between the gray level value of each lamp point and the target gray level value is judged, and the lamp point correction coefficients with the gray level values higher than the target gray level value are corrected until the judgment of the gray level values of all the lamp points in one box body and the correction of the correction coefficients are completed, so that the correction of the whole screen body correction coefficient of the display screen to be corrected is completed, and a target correction coefficient model of the whole screen body is formed.
Fig. 5 is a block diagram illustrating a structure of a gamma correction coefficient correction apparatus according to an exemplary embodiment, and as shown in fig. 5, the apparatus 500 includes:
the modified model determining module 510 determines a correction coefficient modified model according to a first correction coefficient of the sample box in a cold shielding state and a second correction coefficient of the sample box in a hot shielding state;
a difference determining module 520, connected to the modified model determining module 510, for determining a difference value of the correction coefficient corresponding to each gray scale value according to a third correction coefficient corresponding to each gray scale value in a preset gray scale range of the box body of the display screen to be corrected determined in the cold screen state and a fourth correction coefficient corresponding to each gray scale value in a preset gray scale range of the box body of the display screen to be corrected determined in the hot screen state;
a target gray level value determining module 530, connected to the difference determining module 520, for determining a target gray level value within the preset gray level range according to a preset threshold and a correction coefficient difference corresponding to each gray level value;
an original correction coefficient determining module 540, connected to the target gray scale value determining module 530, for obtaining an original correction coefficient of a box body in the display screen to be corrected in a cold screen state, and taking the original correction coefficient as a target correction coefficient if the gray scale value of the box body is smaller than the target gray scale value;
and a correction coefficient modification module 550, connected to the original correction coefficient determination module 540, for taking the sum of the original correction coefficient of the box and the correction coefficient modification model as the modified target correction coefficient if the gray level of the box is greater than or equal to the target gray level.
Fig. 6 is a block diagram illustrating a modified model determining module according to fig. 5, wherein the modified model determining module 510, as shown in fig. 6, includes:
a sample box determining unit 511 that determines a sample box and a preset gray level value;
the first correction coefficient determining unit 512 is connected with the sample box body determining unit 511, and determines a first correction coefficient corresponding to the sample box body under a preset gray scale value in a cold screen state;
a second correction coefficient determining unit 513, connected to the first correction coefficient determining unit 512, for determining a second correction coefficient corresponding to the sample box under a preset gray level value in the hot-screen state;
a modified model determining unit 514, connected to the second correction coefficient determining unit 513, uses the absolute values of the differences between the plurality of first correction coefficients and the second correction coefficients as the correction coefficient modified model.
Fig. 7 is a block diagram illustrating a difference determining module 520 according to fig. 5, wherein the preset gray scale range is {1, 2, 3, … …, 255}, as shown in fig. 7, and the difference determining module comprises:
a third correction coefficient determining unit 521, configured to determine, in the cold state, a third correction coefficient corresponding to each gray scale value of the box in the display screen to be corrected in the {1, 2, 3, … …, 255} gray scale range;
a fourth correction coefficient determining unit 522, connected to the third correction coefficient determining unit 521, for determining, in the hot-screen state, a fourth correction coefficient corresponding to each gray scale value of the box in the {1, 2, 3, … …, 255} gray scale range of the display screen to be corrected;
a correction coefficient difference determining unit 523 connected to the fourth correction coefficient determining unit 522, for determining a difference absolute value obtained by subtracting the fourth correction coefficient from the third correction coefficient corresponding to each gray scale value as the correction coefficient difference corresponding to the gray scale value.
The disclosed embodiment of the present invention further provides a correction coefficient modification system based on gray scale, the system comprising: the correction system comprises a correction coefficient correction device based on gray scale, a display screen to be corrected, a sending card and a receiving card;
the gray scale-based correction coefficient correction device is connected with a sending card, the sending card is connected with a receiving card, and the sending card is used for sending the target correction coefficient to the receiving card through the sending card after determining the target correction coefficient of each lamp point according to the correction coefficient correction method;
the receiving card is positioned in the display screen to be corrected so as to correct the lamp points in the display screen to be corrected according to the target correction coefficient.
In summary, the present disclosure relates to a method, an apparatus, and a system for correcting a correction coefficient based on gray scale, wherein the method comprises: determining a correction coefficient correction model according to the sample box body; determining a correction coefficient difference corresponding to each gray-scale value; determining a target gray scale value within the preset gray scale range according to a preset threshold value and a correction coefficient difference value corresponding to each gray scale value; acquiring an original correction coefficient of a display screen to be corrected in a cold screen state, and taking the original correction coefficient as a target correction coefficient if the gray scale value of a lamp point of the box body is smaller than a target gray scale value; and if the gray scale value of the box body lamp point is larger than or equal to the target gray scale value, taking the sum of the original correction coefficient of the box body lamp point and the correction coefficient correction model as the corrected target correction coefficient.
The correction coefficients suitable for the box body under various gray scales can be calculated through software according to the box body with the same model, a temperature detection device does not need to be specially installed in the box body to continuously detect the temperature change of the box body and calculate the corresponding correction coefficients, the time spent for calculating the correction coefficients is short, the time required for correction is saved, the correction efficiency is improved, and meanwhile, the display effect of the screen body under various temperatures is also ensured.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A method for modifying a gamma correction coefficient based on gray scale, the method comprising:
determining a correction coefficient correction model according to a first correction coefficient of the sample box body in a cold screen state and a second correction coefficient of the sample box body in a hot screen state;
determining a correction coefficient difference value corresponding to each gray scale value according to a third correction coefficient which is determined in a cold screen state and corresponds to each gray scale value in a preset gray scale range of the box body of the display screen to be corrected respectively and a fourth correction coefficient which is determined in a hot screen state and corresponds to each gray scale value in the preset gray scale range of the box body of the display screen to be corrected respectively;
determining a target gray scale value within the preset gray scale range according to a preset threshold value and a correction coefficient difference value corresponding to each gray scale value;
acquiring an original correction coefficient of a box body in a display screen to be corrected in a cold screen state, and taking the original correction coefficient as a target correction coefficient if the gray scale value of the box body is smaller than the target gray scale value;
and if the gray-scale value of the box body is larger than or equal to the target gray-scale value, taking the sum of the original correction coefficient of the box body and the correction coefficient correction model as the corrected target correction coefficient.
2. The gamma correction method according to claim 1, wherein the determining a correction coefficient correction model based on the first correction coefficient of the sample box in the cold-shielding state and the second correction coefficient of the sample box in the hot-shielding state comprises:
determining a sample box body and a preset gray scale value;
determining a first correction coefficient corresponding to the sample box body under a preset gray scale value in a cold screen state;
determining a second correction coefficient corresponding to the sample box body under a preset gray scale value in a heat shield state;
and taking the absolute value of the difference value between a plurality of first correction coefficients and a plurality of second correction coefficients as the correction coefficient modification model.
3. The method for modifying a gamma correction coefficient according to claim 1, wherein the predetermined gray scale range is {1, 2, 3, … …, 255}, and the determining the correction coefficient difference corresponding to each gray scale value according to the third correction coefficient corresponding to each gray scale value in the predetermined gray scale range of the cabinet in the display to be corrected determined in the cold state and the fourth correction coefficient corresponding to each gray scale value in the predetermined gray scale range of the cabinet in the display to be corrected determined in the hot state comprises:
determining a third correction coefficient corresponding to each gray scale value of a box body in the display screen to be corrected in a {1, 2, 3, … …, 255} gray scale range in a cold screen state;
determining a fourth correction coefficient corresponding to each gray scale value of the box body in the display screen to be corrected in a {1, 2, 3, … …, 255} gray scale range in a hot screen state;
and taking the absolute value of the difference obtained by subtracting the fourth correction coefficient from the third correction coefficient corresponding to each gray-scale value as the correction coefficient difference corresponding to the gray-scale value.
4. The method for modifying a gamma correction factor according to claim 3, wherein the determining a target gray scale value within the predetermined gray scale range according to the predetermined threshold and the correction factor difference corresponding to each gray scale value comprises:
determining a correction coefficient difference value corresponding to a gray-scale value i, wherein i is valued from 1 to large in a gray-scale range of {1, 2, 3, … …, 255 };
comparing the correction coefficient difference corresponding to the gray-scale value i with the magnitude relation between the preset threshold values;
if the correction coefficient difference value corresponding to the gray-scale value i is smaller than the preset threshold value, enabling i to be i +1, and repeatedly executing the step from the step of determining the correction coefficient difference value corresponding to the gray-scale value i to the step of comparing the correction coefficient difference value corresponding to the gray-scale value i with the preset threshold value;
and if the difference value of the correction coefficient corresponding to the gray-scale value i is larger than or equal to the preset threshold value, taking the i as the target gray-scale value and stopping traversing.
5. The correction coefficient correction method based on gray scale as claimed in claim 3, wherein the first temperature value corresponding to the cold screen state is a temperature value of the sample box and/or the display screen to be corrected at room temperature;
and the second temperature value corresponding to the heat shield state is the highest temperature value which can be reached by the sample box body and/or the display screen to be corrected in the vacuum state.
6. The gamma correction method according to claim 5, wherein the method further comprises:
determining a display screen to be corrected;
determining a temperature value of the display screen to be corrected at room temperature, and taking the temperature value at room temperature as a first temperature value of the display screen to be corrected in a cold screen state;
and determining the highest temperature value which can be reached by the screen body of the display screen to be corrected in a vacuum state, and taking the highest temperature value as a second temperature value of the display screen to be corrected in a heat shield state.
7. A gamma correction coefficient modification apparatus based on gradation, characterized by comprising:
the correction model determining module is used for determining a correction coefficient correction model according to a first correction coefficient of the sample box body in a cold screen state and a second correction coefficient of the sample box body in a hot screen state;
the difference value determining module is connected with the correction model determining module and determines a correction coefficient difference value corresponding to each gray scale value according to a third correction coefficient which is determined in a cold screen state and corresponds to each gray scale value in a preset gray scale range of the middle box body of the display screen to be corrected respectively and a fourth correction coefficient which is determined in a hot screen state and corresponds to each gray scale value in the preset gray scale range of the middle box body of the display screen to be corrected respectively;
the target gray scale value determining module is connected with the difference value determining module and determines a target gray scale value within the preset gray scale range according to a preset threshold value and the correction coefficient difference value corresponding to each gray scale value;
the original correction coefficient determining module is connected with the target gray scale value determining module, obtains an original correction coefficient of a box body in the display screen to be corrected in a cold screen state, and takes the original correction coefficient as a target correction coefficient if the gray scale value of the box body is smaller than the target gray scale value;
and the correction coefficient correction module is connected with the original correction coefficient determination module, and if the gray-scale value of the box body is greater than or equal to the target gray-scale value, the sum of the original correction coefficient of the box body and the correction coefficient correction model is used as the corrected target correction coefficient.
8. The gamma correction coefficient modification apparatus according to claim 7, wherein the modification model determination module includes:
the sample box body determining unit is used for determining a sample box body and a preset gray scale value;
the first correction coefficient determining unit is connected with the sample box body determining unit and determines a first correction coefficient corresponding to the sample box body under a preset gray scale value in a cold screen state;
the second correction coefficient determining unit is connected with the first correction coefficient determining unit and determines a second correction coefficient corresponding to the sample box body under a preset gray-scale value in a hot screen state;
and a correction model determining unit connected to the second correction coefficient determining unit, for determining an absolute value of a difference between the plurality of first correction coefficients and the plurality of second correction coefficients as the correction coefficient correction model.
9. The apparatus for modifying a gamma correction coefficient according to claim 7, wherein the predetermined gray scale range is {1, 2, 3, … …, 255}, and the difference determination module comprises:
the third correction coefficient determining unit is used for determining a third correction coefficient corresponding to each gray-scale value of the box body in the display screen to be corrected in a {1, 2, 3, … …, 255} gray-scale range in a cold screen state;
the fourth correction coefficient determining unit is connected with the third correction coefficient determining unit and is used for determining a fourth correction coefficient corresponding to each gray-scale value of the box body in the display screen to be corrected in a {1, 2, 3, … …, 255} gray-scale range in the hot screen state;
and the correction coefficient difference determining unit is connected with the fourth correction coefficient determining unit and takes a difference absolute value obtained by subtracting the fourth correction coefficient from the third correction coefficient corresponding to each gray-scale value as a correction coefficient difference corresponding to the gray-scale value.
10. A gamma correction system based on gamma correction, the system comprising: the gamma correction device based on gradation as set forth in any one of claims 7 to 9, a display screen to be corrected, a transmission card and a reception card;
the gray scale-based correction coefficient modification device is connected with a sending card, the sending card is connected with a receiving card, and the gray scale-based correction coefficient modification device is used for determining a target correction coefficient of each lamp point according to the correction coefficient modification method of any one of claims 1 to 6 and then sending the target correction coefficient to the receiving card through the sending card;
and the receiving card is positioned in the display screen to be corrected so as to correct the lamp points in the display screen to be corrected according to the target correction coefficient.
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