CN114530119B - 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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- CN114530119B CN114530119B CN202210176129.2A CN202210176129A CN114530119B CN 114530119 B CN114530119 B CN 114530119B CN 202210176129 A CN202210176129 A CN 202210176129A CN 114530119 B CN114530119 B CN 114530119B
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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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- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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Abstract
The invention discloses a correction coefficient correction method, a correction coefficient correction device and a correction coefficient correction system based on gray scale, wherein the correction coefficient correction method comprises the following steps: determining a correction coefficient correction model according to the sample box; determining a correction coefficient difference value corresponding to each gray scale value; determining a target gray scale value in 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 box lamp point 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 value of the original correction coefficient of the box body lamp point and the correction coefficient correction model as the corrected target correction coefficient. The display effect of the screen body at various temperatures can be ensured without continuously detecting the change of the temperature of the screen body by calculating the correction coefficient applicable to various gray scales of the box body, so that the time is saved, 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 that the difference between the display brightness and the chromaticity of a display area of a screen body is caused by the uneven temperature distribution of the screen body is called a cross line phenomenon in the industry, and the specific reason is that an initial correction coefficient is not suitable for the 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 the screen body so as to solve the problem that the screen body has a cross wire in a high-gray stage. However, when the method is adopted, if the correction coefficient corresponding to the high gray stage is still used for the low gray stage of the screen body, the correction coefficient of the high gray stage is not suitable for correcting the lighting chromaticity of the lamp in the low gray stage, so that the display effect of the screen body is greatly reduced; if the correction coefficient corresponding to the screen body in the low-ash stage is calculated in the low-ash 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, a new solution to the above-mentioned problems is needed for those skilled in the art.
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 correction coefficient correction method based on gray scale, the method including:
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 level according to a third correction coefficient, which is determined in a cold screen state, of the box in the display screen to be corrected and corresponds to each gray level in a preset gray level range, and a fourth correction coefficient, which is determined in a hot screen state and corresponds to each gray level in the display screen to be corrected and corresponds to each gray level in the preset gray level range, of the box in the display screen to be corrected;
determining a target gray scale value in 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 level value of the box body is larger than or equal to the target gray level value, taking the sum value of the original correction coefficient and the correction coefficient correction model of the box body as a corrected target correction coefficient.
Optionally, the determining the correction coefficient correction model according to the first correction coefficient of the sample box body in the cold screen state and the second correction coefficient of the sample box body in the hot screen state includes:
determining a sample box 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 screen state;
and taking absolute values of differences 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 determining the difference value of the correction coefficients corresponding to each gray scale value according to the third correction coefficient corresponding to each gray scale value in the preset gray scale range of the box in the display screen to be corrected determined in the cold screen state and the fourth correction coefficient corresponding to each gray scale value in the preset gray scale range of the box 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 in the {1,2,3, … …,255} gray scale range of a box body in the display screen to be corrected in a cold screen state;
determining a fourth correction coefficient corresponding to each gray scale value in the {1,2,3, … …,255} gray scale range of a box body in the display screen to be corrected in a heat screen state;
and subtracting the fourth correction coefficient from the third correction coefficient corresponding to each gray level value to obtain a difference absolute value serving as a correction coefficient difference corresponding to the gray level value.
Optionally, the determining the target gray-scale value in the preset gray-scale range according to the preset threshold and the correction coefficient difference value corresponding to each gray-scale value includes:
determining a correction coefficient difference value corresponding to a gray level value i, wherein i takes a value from 1 to large in a {1,2,3, … …,255} gray level range;
comparing the magnitude relation between the correction coefficient difference value corresponding to the gray level value i and the preset threshold value;
if the difference value of the correction coefficient corresponding to the gray level value i is smaller than the preset threshold value, making i=i+1 and repeatedly executing the steps from the determination of the difference value of the correction coefficient corresponding to the gray level value i to the comparison of the difference value of the correction coefficient corresponding to the gray level value i and the magnitude relation between the preset threshold value;
and if the difference value of the correction coefficient corresponding to the gray level value i is greater than or equal to the preset threshold value, taking the i as the target gray level 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 room temperature;
and the second temperature value corresponding to the thermal screen state is the highest temperature value which can be reached by the screen body of the sample box body and/or the display screen to be corrected in the vacuum state.
Optionally, 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 the 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 the vacuum state, and taking the highest temperature value as a second temperature value of the display screen to be corrected in the hot screen state.
According to a second aspect of the disclosed embodiments of the present invention, there is provided a correction coefficient correction device based on gradation, the device including:
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 the difference value of the correction coefficient corresponding to each gray level according to the third correction coefficient corresponding to each gray level in the preset gray level range of the box body in the display screen to be corrected, which is determined in the cold screen state, and the fourth correction coefficient corresponding to each gray level in the preset gray level range of the box body in the display screen to be corrected, which is determined in the hot screen state;
the target gray scale value determining module is connected with the difference value determining module and is used for determining a target gray scale value in the preset gray scale range according to a preset threshold value and a 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, acquires 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 takes the sum of the original correction coefficient of the box and the correction coefficient correction model as a corrected target correction coefficient if the gray level value of the box is greater than or equal to the target gray level value.
Optionally, the correction model determining module includes:
the sample box determining unit is used for determining a sample box and a preset gray level value;
the first correction coefficient determining unit is connected with the sample box body determining unit and is used for determining a first correction coefficient corresponding to the sample box body under a preset gray level value in a cold screen state;
the second correction coefficient determining unit is connected with the first correction coefficient determining unit and is used for determining a second correction coefficient corresponding to the sample box body under a preset gray level value in a heat shield state;
and the correction model determining unit is connected with the second correction coefficient determining unit and takes absolute values of differences between the plurality of first correction coefficients and the 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:
a third correction coefficient determining unit for determining a third correction coefficient corresponding to each gray scale value in the {1,2,3, … …,255} gray scale range of the box body in the display screen to be corrected 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 in the {1,2,3, … …,255} gray scale range of the box body in the display screen to be corrected in a heat screen state;
and the correction coefficient difference value determining unit is connected with the fourth correction coefficient determining unit, and the absolute value of the difference value 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 value corresponding to the gray scale value.
According to a third aspect of the disclosed embodiments of the present invention, there is provided a gradation-based correction coefficient correction system, the system including: the invention discloses a gray-based correction coefficient correction device, a display screen to be corrected, a transmitting card and a receiving card according to a second aspect of the embodiment;
the correction coefficient correction device based on gray scale is connected with a transmitting card, the transmitting card is connected with the receiving card, and is used for transmitting the target correction coefficient to the receiving card through the transmitting card after determining the target correction coefficient of each lamp point according to the correction coefficient correction method of the first aspect of the disclosed embodiment of the invention;
the receiving card is positioned in the display screen to be corrected, so that the lamp points in the display screen to be corrected are corrected according to the target correction coefficient.
In summary, the present disclosure relates to a correction coefficient correction method, device and system based on gray scale, where the method includes: determining a correction coefficient correction model according to the sample box; determining a correction coefficient difference value corresponding to each gray scale value; determining a target gray scale value in 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 box lamp point 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 value 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 coefficient applicable to 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 is not required to be specially installed in the box body to continuously detect the temperature change of the box body and calculate the corresponding correction coefficient, the time spent in calculating the correction coefficient is less, the time required by 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 are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a gray-based correction factor correction method according to an exemplary embodiment;
FIG. 2 is a flow chart of a correction factor correction model determination method according to the one shown in FIG. 1;
FIG. 3 is a flow chart of a correction factor difference determination method according to the one shown in FIG. 1;
FIG. 4 is a flow chart of a target gray level value determination method according to the one shown in FIG. 1;
FIG. 5 is a block diagram illustrating a configuration of a gray-based correction coefficient correcting apparatus according to an exemplary embodiment;
FIG. 6 is a block diagram of a correction model determination module according to the one shown in FIG. 5;
fig. 7 is a block diagram of a difference determination module according to the one shown in fig. 5.
Detailed Description
The following describes in detail the embodiments of the present disclosure with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Fig. 1 is a flowchart illustrating a gray-based correction factor correction method according to an exemplary embodiment, as shown in fig. 1, the method including:
in step 101, a correction coefficient correction model is determined according to a first correction coefficient of the sample box in a cold screen state and a second correction coefficient of the sample box in a hot screen state.
For example, before correcting the correction coefficient of the display screen to be corrected in the disclosed embodiment of the invention, a correction coefficient correction model needs to be established, where the correction coefficient correction model is used to represent the difference between the correction coefficients of the same box body in the cold screen state and the hot screen state. It should be noted that, the correction coefficient in the hot screen state of the same box is different from the correction coefficient in the cold screen state, because the brightness of the light point display in the box decreases as the box temperature increases. When the temperature of the box is higher than the preset temperature threshold, part of the electric energy used for supporting the red light spot to emit light in the box is converted into heat energy (for example, if the red light spot obtains 5V voltage for lighting the light spot, but under the condition that the temperature of the screen is too high, only 3.8V voltage in the 5V voltage is used for lighting the light spot, and the rest of the voltage is converted into heat energy), and the heat energy is emitted to the outside along a gap in the box, so that the lighting degree of the light spot at the gap in the box is affected, and in general, the effect of the difference of the brightness degree in the middle area of the screen is most obvious, namely, a cross line problem is formed, so that a correction coefficient correction model needs to be calculated to correct the correction coefficient of the light spot in the gap area affected by the temperature. The correction coefficient in this embodiment may be a luminance correction coefficient.
Wherein fig. 2 is a flowchart of a correction coefficient correction model determining method according to the one shown in fig. 1, and as shown in fig. 2, the step 101 includes:
in step 1011, a sample bin and a preset gray scale value are determined.
For example, a sample box body under a preset gray level value is selected, a first correction coefficient of the sample box body is measured in a cold screen state, and a second correction coefficient of the sample box body is measured in a hot screen state, and a correction coefficient correction model is determined according to the numerical change condition of the correction coefficient of the sample box body between the cold screen state and the hot screen state. It should be noted that, the sample box is selected from a plurality of boxes of the same type in the same production lot, and the production lot and type of the sample box used in this step should be the same as those of the boxes in the display screen to be corrected in the following steps 102-105 (which may be understood as the same type and size of the box).
The preset gray level value may be any gray level value between 1 and 255, and is preferably 255 in general, because in the high gray level state, the exposure time of the camera is fastest, so that it is convenient to obtain a picture containing all the lighting chromaticity information of the lamps through the camera.
In addition, the temperature of the sample box in the cold-screen state is a first temperature value, that is, the room temperature in the environment where the sample box is currently located, and the temperature of the sample box in the hot-screen state is a second temperature value, that is, the highest temperature value (for example, 50 ℃) that the sample box can reach in an ideal state (also can be understood as a vacuum state). The maximum temperature value means that when the temperature of the sample box reaches the maximum temperature value, the sample box still can work normally, but if the temperature value of the sample box exceeds the maximum temperature value, the sample box cannot work continuously. In general, the maximum temperature value may be obtained from factory information of the sample box.
In step 1012, a first correction coefficient corresponding to the sample box at a preset gray level is determined in the cold screen state.
In step 1013, a second correction coefficient corresponding to the sample box at the preset gray level value is determined in the heat shield state.
For example, after determining the first temperature value corresponding to the cold screen state and the second temperature value corresponding to the hot screen state, determining the first correction coefficient of the sample box according to the brightness value of the lamp point in the sample box and the target brightness value in the cold screen state (i.e., the first temperature value), preheating the sample box to the second temperature value corresponding to the hot screen state, at this time, the brightness value of the lamp point in the sample box has changed due to the change of the temperature (normally, the lamp point will be darkened), and determining the second correction coefficient of the sample box according to the target brightness value and the brightness value of the lamp point in the hot screen state. It can be seen that, in general, the value of the second correction coefficient will be greater than the value of the first correction coefficient.
In step 1014, the absolute values of the differences between the plurality of first correction coefficients and the plurality of second correction coefficients are used as the correction coefficient correction 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 of different types of different production batches can be selected for calculating the correction coefficient correction model. In this case, the first correction coefficient in the cold-screen state and the second correction coefficient in the hot-screen state are also plural, and the absolute values of the differences between the plural first correction coefficients and the second correction coefficients are used together as the correction coefficient correction model, so that the correction coefficient correction model error due to the individual error between the sample boxes can be further reduced.
In step 102, a correction coefficient difference value corresponding to each gray scale value is determined according to a third correction coefficient corresponding to each gray scale value of the box in the display screen to be corrected, which is determined in the cold screen state, in a preset gray scale range, and a fourth correction coefficient corresponding to each gray scale value of the box in the display screen to be corrected, which is determined in the hot screen state, in the preset gray scale range.
For example, the correction coefficient of the box body in the display screen to be corrected will change under different temperatures and different gray scale values, so in the embodiment of the invention, a preset gray scale range is selected first, the box body in the display screen to be corrected is respectively adjusted to each gray scale value in the preset gray scale range under the cold screen state and the hot screen state, a third correction coefficient corresponding to each gray scale value under the cold screen state and a fourth correction coefficient corresponding to the hot screen state are obtained, and the correction coefficient difference value corresponding to each gray scale value can be determined according to the third gray scale value and the fourth gray scale value, and the correction coefficient difference value can be used for representing the change of the correction coefficient of the box body along with the change of the temperature and the gray scale value. When the correction coefficient difference value is calculated, one or more boxes in the display screen to be corrected can be selected for calculation. For example, if the types and sizes of the boxes in the display screen to be corrected are the same, only one box can be selected for correction coefficient difference calculation, and if the types of the boxes in the display screen to be corrected are different, at least one box under each type can be selected for correction coefficient difference calculation. In addition, the box body in the display screen to be corrected and the sample box body in the step 1011 belong to the same production batch and the same type, namely the model and the size of the box body in the display screen to be corrected and the sample box body are the same. When the boxes in the display screen to be corrected are respectively from different production batches and types, the sample boxes should also include a plurality of boxes, and are respectively from corresponding production batches and types. In performing correction coefficient correction in step 105 described below, the original correction coefficient (which is the original correction coefficient from the same production lot as the sample box and the same type of box) should also be corrected using the correction coefficient correction model calculated for the same production lot as the sample box.
Wherein the preset gray scale range is 1-255. In general, the gray scale values of the lamp points include 256 gray scale values of 0,1,2, … …,255, but in the embodiment of the present disclosure, 1,2,3, … …,255 gray scale values are selected, and when the gray scale value is 0, the lamp points are all black, so that the correction coefficient under 0 gray scale is not required to be collected.
Wherein fig. 3 is a flowchart of a correction coefficient difference determining method according to the method shown in fig. 1, and 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 screen to be corrected is determined in the cold-screen 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 screen to be corrected is determined in the hot-screen state.
For example, the method is similar to the step 1011, after the display screen to be corrected is determined, the first temperature value of the display screen to be corrected in the cold screen state is determined according to the temperature value of the display screen to be corrected at the room temperature, and then the second temperature value of the display screen to be corrected in the hot screen state is determined according to the highest temperature value (the highest temperature value is the highest temperature critical value that can be normally operated by the display screen to be corrected in the ideal state) that can be reached by the display screen to be corrected in the cold screen state, if the temperature of the display screen to be corrected is higher than the highest temperature value, the display screen to be corrected cannot normally operate or fails.
After the first temperature value in the cold screen state and the second temperature value in the hot screen state are determined, 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. And then preheating the box body in the display screen to be corrected to a heat screen state under a second temperature value, respectively adjusting the gray scale of the box body from 1 to 255 under the heat screen state, and recording and obtaining a fourth correction coefficient under each gray scale.
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.
For example, 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-scale value is determined within the preset gray-scale range according to the preset threshold and the correction coefficient difference value corresponding to each gray-scale value.
For example, the correction factor difference determined in steps 1021-1023 is used to determine whether the light point in the display screen to be corrected needs to be corrected for the gray scale value boundary (i.e., the target gray scale value) by correction factor correction. In the embodiment of the invention, the difference value of the correction coefficient is compared with the preset threshold value, if the difference value of the correction coefficient is greater than or equal to the preset threshold value, the difference between the correction coefficient of the box body lamp point in the cold screen state and the correction coefficient of the box body lamp point in the hot screen state is larger, and at the moment, correction of the correction coefficient is required (correction is performed through 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 value, it is indicated that the difference between the correction coefficients of the box body lamp points in the cold screen state and the hot screen state is smaller under the gray scale value corresponding to the correction coefficients, and the difference is negligible. For example, if the preset threshold is set to 0.01, when the difference of the correction coefficients is less than 0.01, it indicates that the change of the correction coefficient of the box body under the gray scale value is very small (that is, the brightness of the lamp point is not obviously changed with the temperature) under the cold screen state and the hot screen state, and therefore, correction is not needed, and when the difference of the correction coefficients is greater than or equal to 0.01, the correction coefficient of the lamp point under the gray scale value is corrected according to the correction coefficient correction model.
Therefore, in the embodiment of the present invention, after determining the correction coefficient difference value corresponding to each gray level value, the gray level value corresponding to the correction coefficient difference value greater than the preset threshold is taken as the target gray level value by traversing the correction coefficient difference value until the correction coefficient difference value greater than the preset threshold is determined.
Specifically, fig. 4 is a flowchart of a target gray-scale value determining method according to the 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 a value from small to large in the {1,2,3, … …,255} gray scale range.
In step 1032, the correction coefficient difference corresponding to the gray-scale value i is compared with the magnitude relation between the preset threshold.
In step 1033, if the difference of the correction coefficients corresponding to the gray-scale value i is smaller than the preset threshold value, let i=i+1 and repeatedly execute the steps from the determination of the difference of the correction coefficients corresponding to the gray-scale value i to the comparison of the magnitude relation between the difference of the correction coefficients corresponding to the gray-scale value i and the preset threshold value.
In step 1034, if the difference of the correction coefficients corresponding to the gray-scale value i is greater than or equal to the preset threshold value, i is taken as the target gray-scale value and the traversal is stopped.
For example, in general, the change of the lighting chromaticity value of the lamp in the high gray level is more obvious along with the increase of the screen temperature, while the change of the lighting chromaticity value of the lamp in the low gray level is slower along with the increase of the screen temperature, that is, the difference of the correction coefficients increases along with the increase of the gray level for the same box. In this way, when the correction coefficient difference values corresponding to different gray scale values are compared, only the magnitude relation between the correction coefficient difference value corresponding to each gray scale value and the preset threshold value is required to be traversed gradually from the low gray scale value to the high gray scale value from 1 to 255. For example, let i=1, compare the relation between the correction coefficient difference value corresponding to the gray scale value and the preset threshold value from i, if the correction coefficient difference value is smaller than the preset threshold value, let i=i+1 and then continue to compare the relation between the correction coefficient difference value corresponding to the newly assigned i and the preset threshold value until it is determined that the correction coefficient difference value corresponding to i is greater than or equal to the preset threshold value, stop traversing, and take i as the target correction coefficient difference value. If the traversal starts from i=1, when i=199, determining that the corresponding correction coefficient difference value is greater than the preset threshold value, determining 199 as the target gray-scale value, and simultaneously, traversing the relation between the correction coefficient difference value and the preset threshold value under the gray-scale values of 200-255 is not needed.
In step 104, the original correction coefficient of the box in the display screen to be corrected is obtained in the 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, so that the original correction coefficient corresponding to each box needs to be obtained in a cold screen state. At present, when a display screen to be corrected is corrected, an initial brightness image of the whole screen body is usually shot by a camera, and finally, a point-by-point correction method is carried out on each lamp point in the display screen to be corrected through the initial brightness image.
After the original correction coefficients are obtained, the gray scale values of all the lamp points in each box body are respectively judged, and when the gray scale values of the lamp points are smaller than the target gray scale values, the original correction coefficients do not need to be corrected, so that the brightness of the lamp points can be corrected directly through the original correction coefficients.
In step 105, if the gray-scale value of the box is greater than or equal to the target gray-scale value, the sum of the original correction coefficient and the correction coefficient correction model of the box is used as the corrected target correction coefficient.
For example, as for the gray-scale value of the case, the gray-scale value of each light point in the case may be understood, and when the gray-scale value of the light point in the case is greater than or equal to the target gray-scale value, the sum value obtained by adding the original correction coefficient of the light point to the correction coefficient correction model is used as the target correction coefficient after the correction of the light point. Thus, judging the relation between the gray scale value of each lamp point and the target gray scale value, and correcting the lamp point correction coefficient with the gray scale value higher than the target gray scale value until the gray scale value judgment and correction coefficient correction of all the lamp points in one box body are completed, and further finishing the correction of the correction coefficient of the whole screen body of the display screen to be corrected, and forming a target correction coefficient model of the whole screen body.
Fig. 5 is a block diagram showing a configuration of a gray-based correction coefficient correcting apparatus according to an exemplary embodiment, and as shown in fig. 5, the apparatus 500 includes:
the correction model determining module 510 determines 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 520 is connected with the correction model determining module 510, and determines a correction coefficient difference value corresponding to each gray level value according to a third correction coefficient corresponding to each gray level value in a preset gray level range of the box in the display screen to be corrected determined in the cold screen state and a fourth correction coefficient corresponding to each gray level value in a preset gray level range of the box in the display screen to be corrected determined in the hot screen state;
the target gray level determining module 530 is connected to the difference determining module 520, and determines a target gray level within the preset gray level range according to a preset threshold and a correction coefficient difference value corresponding to each gray level;
the original correction coefficient determining module 540 is connected with the target gray-scale value determining module 530, and obtains an original correction coefficient of a box body in the display screen to be corrected in a cold screen state, and if the gray-scale value of the box body is smaller than the target gray-scale value, the original correction coefficient is used as a target correction coefficient;
the correction coefficient correction module 550 is connected to the original correction coefficient determination module 540, and if the gray level value of the box is greater than or equal to the target gray level value, uses the sum of the original correction coefficient and the correction coefficient correction model of the box as the corrected target correction coefficient.
Fig. 6 is a block diagram of a correction model determining module according to the one shown in fig. 5, and as shown in fig. 6, the correction model determining module 510 includes:
a sample box determining unit 511 that determines a sample box and a preset gray-scale value;
a first correction coefficient determining unit 512, connected to the sample box determining unit 511, for determining a first correction coefficient corresponding to the sample box at a preset gray level 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 scale value in a heat shield state;
a correction model determination unit 514, connected to the second correction coefficient determination unit 513, takes absolute values of differences between the plurality of first correction coefficients and the second correction coefficients as the correction coefficient correction model.
Fig. 7 is a block diagram of a difference determining module according to fig. 5, and as shown in fig. 7, the preset gray scale range is {1,2,3, … …,255}, and the difference determining module 520 includes:
a third correction coefficient determination unit 521 that determines, in the cold screen state, 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 screen to be corrected;
a fourth correction coefficient determining unit 522 connected to the third correction coefficient determining unit 521, for determining a fourth correction coefficient corresponding to each gray-scale value in a {1,2,3, … …,255} gray-scale range of the box in the display screen to be corrected in the heat-screen state;
the correction coefficient difference value determining unit 523 is connected to the fourth correction coefficient determining unit 522, and subtracts the fourth correction coefficient from the third correction coefficient corresponding to each gray-scale value to obtain a difference absolute value as a correction coefficient difference value corresponding to the gray-scale value.
The embodiment of the invention also provides a correction coefficient correction system based on gray scale, which comprises: the device comprises a correction coefficient correction device based on gray scale, a display screen to be corrected, a transmitting card and a receiving card;
the correction coefficient correction device based on gray scale is connected with a transmitting card, the transmitting card is connected with the receiving card, and the correction coefficient correction device is used for transmitting the target correction coefficient to the receiving card through the transmitting 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 correction coefficient correction method, device and system based on gray scale, where the method includes: determining a correction coefficient correction model according to the sample box; determining a correction coefficient difference value corresponding to each gray scale value; determining a target gray scale value in 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 box lamp point 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 value 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 coefficient applicable to 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 is not required to be specially installed in the box body to continuously detect the temperature change of the box body and calculate the corresponding correction coefficient, the time spent in calculating the correction coefficient is less, the time required by 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 have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (8)
1. A correction factor correction method 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 level according to a third correction coefficient, which is determined in a cold screen state, of the box in the display screen to be corrected and corresponds to each gray level in a preset gray level range, and a fourth correction coefficient, which is determined in a hot screen state and corresponds to each gray level in the display screen to be corrected and corresponds to each gray level in the preset gray level range, of the box in the display screen to be corrected;
determining a target gray scale value in 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;
if the gray level value of the box body is larger than or equal to the target gray level value, taking the sum of the original correction coefficient of the box body and the correction coefficient correction model as a corrected target correction coefficient;
the method for determining the correction coefficient correction model according to the first correction coefficient of the sample box body in the cold screen state and the second correction coefficient of the sample box body in the hot screen state comprises the following steps: determining a sample box 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 screen state; and taking absolute values of differences between the plurality of first correction coefficients and the plurality of second correction coefficients as the correction coefficient correction model.
2. The gray-scale-based correction factor correction method according to claim 1, wherein the preset gray-scale range is {1,2,3, … …,255}, the determining the correction factor difference value corresponding to each gray-scale value according to the third correction factor corresponding to each gray-scale value in the preset gray-scale range of the box in the display screen to be corrected determined in the cold-screen state, and the fourth correction factor corresponding to each gray-scale value in the preset gray-scale range of the box in the display screen to be corrected determined in the hot-screen state, comprises:
determining a third correction coefficient corresponding to each gray scale value in the {1,2,3, … …,255} gray scale range of a box body in the display screen to be corrected in a cold screen state;
determining a fourth correction coefficient corresponding to each gray scale value in the {1,2,3, … …,255} gray scale range of a box body in the display screen to be corrected in a heat screen state;
and subtracting the fourth correction coefficient from the third correction coefficient corresponding to each gray level value to obtain a difference absolute value serving as a correction coefficient difference corresponding to the gray level value.
3. The gray-scale-based correction factor correction method according to claim 2, wherein determining a target gray-scale value within the preset gray-scale range according to a preset threshold value and a correction factor difference value corresponding to each gray-scale value comprises:
determining a correction coefficient difference value corresponding to a gray level value i, wherein i takes a value from 1 to large in a {1,2,3, … …,255} gray level range;
comparing the magnitude relation between the correction coefficient difference value corresponding to the gray level value i and the preset threshold value;
if the difference value of the correction coefficient corresponding to the gray level value i is smaller than the preset threshold value, making i=i+1 and repeatedly executing the steps from the determination of the difference value of the correction coefficient corresponding to the gray level value i to the comparison of the difference value of the correction coefficient corresponding to the gray level value i and the magnitude relation between the preset threshold value;
and if the difference value of the correction coefficient corresponding to the gray level value i is greater than or equal to the preset threshold value, taking the i as the target gray level value and stopping traversing.
4. The correction coefficient correction method based on gray scale according to claim 2, 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 thermal screen state is the highest temperature value which can be reached by the screen body of the sample box body and/or the display screen to be corrected in the vacuum state.
5. The gradation-based correction factor correction method according to claim 4, characterized in that said 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 the 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 the vacuum state, and taking the highest temperature value as a second temperature value of the display screen to be corrected in the hot screen state.
6. A correction factor correction device based on gradation, 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 the difference value of the correction coefficient corresponding to each gray level according to the third correction coefficient corresponding to each gray level in the preset gray level range of the box body in the display screen to be corrected, which is determined in the cold screen state, and the fourth correction coefficient corresponding to each gray level in the preset gray level range of the box body in the display screen to be corrected, which is determined in the hot screen state;
the target gray scale value determining module is connected with the difference value determining module and is used for determining a target gray scale value in the preset gray scale range according to a preset threshold value and a 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, acquires 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;
the correction coefficient correction module is connected with the original correction coefficient determination module, and takes the sum of the original correction coefficient of the box and the correction coefficient correction model as a corrected target correction coefficient if the gray level value of the box is greater than or equal to the target gray level value;
wherein, the correction model determining module includes: the sample box determining unit is used for determining a sample box and a preset gray level value; the first correction coefficient determining unit is connected with the sample box body determining unit and is used for determining a first correction coefficient corresponding to the sample box body under a preset gray level value in a cold screen state; the second correction coefficient determining unit is connected with the first correction coefficient determining unit and is used for determining a second correction coefficient corresponding to the sample box body under a preset gray level value in a heat shield state; and the correction model determining unit is connected with the second correction coefficient determining unit and takes absolute values of differences between the plurality of first correction coefficients and the second correction coefficients as the correction coefficient correction model.
7. The gray-scale based correction factor correction device according to claim 6, wherein the preset gray-scale range is {1,2,3, … …,255}, the difference determining module comprises:
a third correction coefficient determining unit for determining a third correction coefficient corresponding to each gray scale value in the {1,2,3, … …,255} gray scale range of the box body in the display screen to be corrected 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 in the {1,2,3, … …,255} gray scale range of the box body in the display screen to be corrected in a heat screen state;
and the correction coefficient difference value determining unit is connected with the fourth correction coefficient determining unit, and the absolute value of the difference value 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 value corresponding to the gray scale value.
8. A gray-based correction factor correction system, the system comprising: the gradation-based correction factor correction device, display screen to be corrected, transmitting card, and receiving card according to any one of claims 6 to 7;
the correction coefficient correction device based on gray scale is connected with a transmitting card, the transmitting card is connected with the receiving card, and is used for transmitting the target correction coefficient to the receiving card through the transmitting card after determining the target correction coefficient of each lamp point according to the correction coefficient correction method of any one of claims 1-5;
the receiving card is positioned in the display screen to be corrected, so that the lamp points in the display screen to be corrected are corrected according to the target correction coefficient.
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