CN112925498A - Method and device for adjusting Gamma value in stacked screen, stacked screen and storage medium - Google Patents
Method and device for adjusting Gamma value in stacked screen, stacked screen and storage medium Download PDFInfo
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- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
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Abstract
The invention discloses a method and a device for adjusting Gamma value in a stacked screen, the stacked screen and a storage medium, wherein the stacked screen comprises a main screen and an auxiliary screen which are arranged in a stacked mode, and the method comprises the following steps: controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray scale image corresponding to each gray scale contained in the overlapped screen; the Gamma values adopted by the main screen and the auxiliary screen for Gamma correction are different, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen; collecting the chromatic value of the corrected single gray scale image corresponding to each gray scale displayed by the overlapped screen; determining whether the color difference displayed by the overlapped screen is within a set color difference range according to the chromatic value corresponding to each gray scale, and if so, determining the Gamma values adopted by the main screen and the auxiliary screen as the Gamma values finally used; if not, adjusting the Gamma values adopted by the main screen and the auxiliary screen, and performing Gamma correction on the overlapped screen again until the chromatic aberration displayed by the overlapped screen is within the set chromatic aberration range.
Description
Technical Field
The invention relates to the field of display, in particular to a method and a device for adjusting Gamma values in a stacked screen, the stacked screen and a storage medium.
Background
The double-liquid crystal display image is adopted for the overlapped screen, the display contrast can be greatly improved, wherein the lower screen is a black and white display screen (Sub-screen) which is used for backlight control of a pixel level and is equivalent to local dimming (local dimming) of the pixel level, and the upper screen (main screen) is used for displaying a color image.
In some high-end display applications, such as broadcast (television) dedicated display, medical professional display, etc., accurate color restoration display of each gray level is required. Before the liquid crystal display displays images, data of the images to be displayed are usually corrected by using a gamma curve to ensure the brightness of the images, however, the driving characteristics of the liquid crystal display determine that the color saturation of the liquid crystal display is insufficient under low gray scale, and the color gamut expression is seriously reduced. The same problem exists with the stacked screen because it uses a liquid crystal screen.
Disclosure of Invention
The invention provides a method and a device for adjusting Gamma value in a stacked screen, the stacked screen and a storage medium, which are used for solving the technical problems in the prior art.
In a first aspect, to solve the above technical problem, an embodiment of the present invention provides a method for adjusting a Gamma value in a stacked screen, where the stacked screen includes a main screen and an auxiliary screen that are stacked, and a technical scheme of the method is as follows:
controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray scale image corresponding to each gray scale contained in the overlapped screen; the Gamma values adopted by the main screen and the auxiliary screen for Gamma correction are different, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
collecting the chromatic value of the corrected single gray scale image corresponding to each gray scale displayed by the overlapped screen;
determining whether the color difference displayed by the overlapped screen is within a set color difference range according to the chromatic value corresponding to each gray scale, and if so, determining the Gamma values adopted by the main screen and the auxiliary screen as the Gamma values finally used; if the color difference displayed by the screen folding is not within the set color difference range, adjusting the Gamma values adopted by the main screen and the auxiliary screen, and performing Gamma correction on the single gray scale image corresponding to each gray scale contained in the screen folding again until the color difference displayed by the screen folding is within the set color difference range.
One possible implementation manner, controlling the main screen and the auxiliary screen to perform Gamma correction on a single gray scale image corresponding to each gray scale included in the overlapped screen, includes:
controlling the main screen to perform Gamma correction on the single gray scale image by adopting a first Gamma value;
meanwhile, controlling the auxiliary screen to perform Gamma correction on the single gray scale image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
One possible implementation manner, determining whether the color difference of the stacked display is within a set color difference range according to the chromatic value corresponding to each gray scale, includes:
drawing the chromatic values corresponding to all the gray scales into a gray scale change curve graph of the folded screen;
determining an inflection point gray scale value corresponding to an inflection point of jump of a chromatic value from the gray scale change curve graph;
judging whether the inflection point gray scale value is larger than a preset gray scale value or not; the preset gray scale value is a maximum gray scale value corresponding to a maximum color difference value of the set color difference range;
and if the inflection point gray scale value is smaller than the preset gray scale value, determining that the color difference displayed by the overlapped screen is within the set range.
In one possible embodiment, after determining whether the inflection point grayscale value is greater than a preset grayscale value, the method further includes:
if the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the color difference displayed by the overlapped screen is not in the set range;
and adjusting the first Gamma value and the second Gamma value until the inflection point gray scale value is less than or equal to the preset gray scale value.
One possible implementation, adjusting the first Gamma value and the second Gamma value, includes:
reducing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and increasing the second Gamma value by the set value to obtain the adjusted second Gamma value.
One possible implementation, adjusting the first Gamma value and the second Gamma value, includes:
increasing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and reducing the second Gamma value by the set value to obtain an adjusted second Gamma value.
One possible implementation manner, controlling the main screen to perform Gamma correction on the single gray scale image by using a first Gamma value, includes:
dividing the gray scale change curve into a low gray stage curve and a high gray scale stage curve from the inflection point;
controlling the main screen to use the first Gamma value to carry out Gamma correction on the gray scale contained in the high gray scale section curve;
controlling the third Gamma value for the main screen to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the third Gamma value is less than the first Gamma value.
One possible implementation manner, controlling the secondary screen to perform Gamma correction on the single gray scale image by using a second Gamma value, includes:
controlling the secondary screen to use the second Gamma value to carry out Gamma correction on the gray scale contained in the high gray scale section curve;
controlling the fourth Gamma value for the auxiliary screen to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the fourth Gamma value is a difference between the standard Gamma value and the third Gamma value.
In a second aspect, an embodiment of the present invention provides a stacked screen, where the stacked screen includes a main screen and an auxiliary screen, which are stacked, and the Gamma value of the stacked screen is adjusted by using the method according to the first aspect.
In one possible embodiment, when a quantum dot film is used in the stacked screen for image display, the stacked screen further includes:
and the automatic chromaticity control circuit is used for automatically controlling the chromaticity of the image displayed by the screen stack.
In a third aspect, an embodiment of the present invention provides a device for adjusting Gamma values in a stacked screen, where the stacked screen includes a main screen and an auxiliary screen that are stacked, and the device includes:
the correction unit is used for controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray scale image corresponding to each gray scale contained in the overlapped screen; the Gamma values adopted by the main screen and the auxiliary screen for Gamma correction are different, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
the acquisition unit is used for acquiring the chromatic value of the corrected single-gray-scale image corresponding to each gray scale displayed by the folding screen;
the determining unit is used for determining whether the color difference displayed by the overlapped screen is within a set color difference range according to the chromatic value corresponding to each gray scale, and if so, determining the Gamma values adopted by the main screen and the auxiliary screen as the Gamma values finally used; if the color difference displayed by the screen folding is not within the set color difference range, adjusting the Gamma values adopted by the main screen and the auxiliary screen, and performing Gamma correction on the single gray scale image corresponding to each gray scale contained in the screen folding again until the color difference displayed by the screen folding is within the set color difference range.
In a possible embodiment, the correction unit is specifically configured to:
controlling the main screen to perform Gamma correction on the single gray scale image by adopting a first Gamma value;
meanwhile, controlling the auxiliary screen to perform Gamma correction on the single gray scale image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
In one possible embodiment, the determining unit is further configured to:
drawing the chromatic values corresponding to all the gray scales into a gray scale change curve graph of the folded screen;
determining an inflection point gray scale value corresponding to an inflection point of jump of a chromatic value from the gray scale change curve graph;
judging whether the inflection point gray scale value is larger than a preset gray scale value or not; the preset gray scale value is a maximum gray scale value corresponding to a maximum color difference value of the set color difference range;
and if the inflection point gray scale value is smaller than the preset gray scale value, determining that the color difference displayed by the overlapped screen is within the set range.
In one possible embodiment, the determining unit is further configured to:
if the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the color difference displayed by the overlapped screen is not in the set range;
and adjusting the first Gamma value and the second Gamma value until the inflection point gray scale value is less than or equal to the preset gray scale value.
In one possible embodiment, the determining unit is further configured to:
reducing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and increasing the second Gamma value by the set value to obtain the adjusted second Gamma value.
In one possible embodiment, the determining unit is further configured to:
increasing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and reducing the second Gamma value by the set value to obtain an adjusted second Gamma value.
In a possible embodiment, the correction unit is further configured to:
dividing the gray scale change curve into a low gray stage curve and a high gray scale stage curve from the inflection point;
controlling the main screen to use the first Gamma value to carry out Gamma correction on the gray scale contained in the high gray scale section curve;
controlling the third Gamma value for the main screen to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the third Gamma value is less than the first Gamma value.
In a possible embodiment, the correction unit is further configured to:
controlling the secondary screen to use the second Gamma value to carry out Gamma correction on the gray scale contained in the high gray scale section curve;
controlling the fourth Gamma value for the auxiliary screen to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the fourth Gamma value is a difference between the standard Gamma value and the third Gamma value.
In a fourth aspect, an embodiment of the present invention further provides a device for adjusting Gamma values in a stacked screen, including:
at least one processor, and
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, and the at least one processor performs the method according to the first aspect by executing the instructions stored by the memory.
In a fourth aspect, an embodiment of the present invention further provides a readable storage medium, including:
a memory for storing a plurality of data to be transmitted,
the memory is for storing instructions that, when executed by the processor, cause an apparatus comprising the readable storage medium to perform the method as described in the first aspect above.
Drawings
FIG. 1 is a schematic diagram showing the color gamut expression of a liquid crystal panel in an XYZ color space;
fig. 2 is a flowchart of a Gamma value adjustment method in a stacked screen according to an embodiment of the present invention;
FIG. 3 is a gray scale variation curve before Gamma correction of the stacked screen according to the embodiment of the present invention;
fig. 4 is a gray scale variation curve diagram after Gamma correction is performed on a Gamma value determined by using a Gamma value adjustment method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an inflection point in a Gamma-corrected gray-scale variation curve according to an embodiment of the present invention;
FIG. 6 is a schematic sectional view of a gray scale variation curve according to an embodiment of the present invention;
fig. 7 is a gray scale variation curve diagram after Gamma correction is performed on the main screen and the auxiliary screen in a segmented manner according to the embodiment of the present invention;
fig. 8 is a gray scale variation curve diagram of a stacked screen containing quantum dot films provided by the embodiment of the present invention before ACC correction;
fig. 9 is a gray scale variation curve diagram of a stacked screen containing a quantum dot film according to an embodiment of the present invention after ACC correction;
fig. 10 is a schematic structural diagram of a Gamma value adjusting device in a stacked screen according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention provide a method, an apparatus, and a storage medium for Gamma value adjustment in a stacked screen, so as to solve the above technical problems in the prior art.
Fig. 1 is a schematic diagram showing the color gamut of a liquid crystal panel in an XYZ color space.
The chromaticity value of a color in the XYZ color space is represented by x color coordinates, y color coordinates, and z luminance coordinates, for example, a color a located in the XY plane is represented by (x1, y1, z1) in the XYZ color space, x1 may be referred to as the x color component of the color a, y1 may be referred to as the y color component of the color a, and the color a changes to another color with the change of the z luminance coordinates of the color a.
When the liquid crystal screen displays images, the z brightness coordinate is expressed by gray scale, the gray scale included by the liquid crystal screen with the color depth of 8bit is 1-255 (corresponding to 256 kinds of brightness), and the gray scale included by the liquid crystal screen with the color depth of 10bit is 1-1023 (corresponding to 1024 kinds of brightness).
It should be noted that, in fig. 1, since a color image cannot be used, a color change at the same luminance cannot be expressed from the color, and, for example, in fig. 1, one triangular plane (parallel to the XY plane) corresponds to the same luminance, and there is a color change in the plane, but in order to express a luminance change (luminance is different from plane to plane, and the items are different in grayscale in the grayscale), fig. 1 mainly expresses a change at different luminance, and the influence of the luminance change on the color is expressed by a curve (x and y values representing the color are the same) shown in the vertical direction in fig. 1.
The liquid crystal panel is affected by its own driving characteristics, the color saturation is insufficient at low gray levels, the color gamut expression is severely reduced, the actual color gamut expression is shown as the color gamut expression in the XYZ color space shown at the left side in fig. 1, still taking the color a as an example, the dotted line shown in the z direction in fig. 1 represents the color actually displayed by the color a at the corresponding gray level, the dotted line is a curve at low gray levels, and the color difference is large. In an ideal case, the color a in the XYZ space shown on the right side in fig. 1, the dotted line shown in the z direction represents the color that the color a ideally displays at the corresponding gray scale, without chromatic aberration.
In practical application, the liquid crystal screens have poor color when displaying, and the liquid crystal screens (overlapped screens) adopting the overlapped screen technology have the same problem and are more complicated when displaying images.
In order to better understand the technical solutions of the present invention, the following detailed descriptions of the technical solutions of the present invention are provided with the accompanying drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the examples of the present invention are the detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the examples of the present invention may be combined with each other without conflict.
Referring to fig. 2, an embodiment of the present invention provides a method for adjusting Gamma values in a stacked screen, where the stacked screen includes a main screen and an auxiliary screen that are stacked, and the processing procedure of the method is as follows.
Step 201: controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray scale image corresponding to each gray scale contained in the overlapped screen; the Gamma values adopted by the main screen and the auxiliary screen for Gamma correction are different, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
step 202: collecting the chromatic value of the corrected single gray scale image corresponding to each gray scale displayed by the overlapped screen;
step 203: determining whether the color difference displayed by the overlapped screen is within a set color difference range according to the chromatic value corresponding to each gray scale, and if so, determining the Gamma values adopted by the main screen and the auxiliary screen as the Gamma values finally used; if the color difference displayed by the overlapped screen is not in the set color difference range, adjusting the Gamma values adopted by the main screen and the auxiliary screen, and performing Gamma correction on the single gray scale image corresponding to each gray scale contained in the overlapped screen again until the color difference displayed by the overlapped screen is in the set color difference range.
In a possible embodiment, the Gamma correction of the single gray scale image corresponding to each gray scale included in the overlapped screen by controlling the main screen and the auxiliary screen can be realized by the following steps:
controlling the main screen to carry out Gamma correction on the single gray scale image by adopting a first Gamma value;
meanwhile, controlling the auxiliary screen to perform Gamma correction on the single gray scale image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
For example, the color depth of the stacked screen is 8 bits, that is, the included gray scale is 1 to 255, and the display condition is that the standard Gamma value corresponding to the stacked screen is 2.3.
The Gamma correction is performed on the single gray scale image corresponding to each gray scale one by one from gray scale values of 1 to 255 simultaneously by the main screen and the sub screen, and the Gamma value used by the main screen is 1.5 and the Gamma value used by the sub screen is 0.8 (the sum of the Gamma values is 2.3) during the Gamma correction.
When displaying the monochrome gray-scale image P1 having a gray-scale value of 1, the monochrome gray-scale image P1 (the monochrome gray-scale image having a gray-scale value of 1 is referred to as P1, the monochrome gray-scale image having a gray-scale value of 2 is referred to as P2, and the like in the other stages) is Gamma-corrected and displayed using the first Gamma value (1.5) determined by the main panel, and the monochrome gray-scale image P1 is corrected and displayed using the second Gamma value (0.8) determined by the sub-panel. Then, the colorimetric value C1 corresponding to the corrected monochrome gray-scale image P1 displayed by overlapping screens is collected.
Thereafter, the monochrome gray-scale image P2 having a gray-scale value of 2 is displayed, and the monochrome gray-scale image P2 is subjected to Gamma correction and display using the first Gamma value (1.5) determined by the main screen, and the monochrome gray-scale image P2 is subjected to Gamma correction and display using the second Gamma value (0.8) determined by the sub screen. Then, the colorimetric value C2 corresponding to the corrected monochrome gray-scale image P2 displayed by overlapping screens is collected.
The steps are repeated until the chromatic value C255 corresponding to the monochrome gray scale image P255 with the gray scale value of 255 is collected.
And determining whether the color difference displayed by the overlapped screen is in a set range according to the chromatic value corresponding to each gray scale, if the standard chromatic value corresponding to the monochromatic gray scale image P1 with the gray scale value of 1 is a, the correspondingly acquired chromatic value is C1, calculating the color difference delta E1 of a and C1 by using a color difference calculation formula, and judging whether the delta E1 is in the color difference range. If the color difference corresponding to all the gray scales is within the set range, the color difference of the overlapped screen is within the set range, and the first Gamma value (1.5) and the second Gamma value (0.8) adopted by the main screen and the auxiliary screen can be determined as the final Gamma values used by the main screen and the auxiliary screen in the overlapped screen. If one or a preset number (for example, 6) of monochromatic gray-scale images corresponding to the color difference are not in the color difference range, and the color difference displayed by the overlapped screen is determined not to be in the set color difference range, adjusting the Gamma values adopted by the main screen and the auxiliary screen, and performing Gamma correction on the single gray-scale image corresponding to each gray scale contained in the overlapped screen again by using the Gamma values respectively adjusted by the main screen and the auxiliary screen until the color difference displayed by the overlapped screen is in the set color difference range.
Referring to fig. 3 and 4, fig. 3 is a gray scale variation graph before Gamma correction is performed on the stacked screen according to the embodiment of the present invention, and fig. 4 is a gray scale variation graph after Gamma correction is performed on a Gamma value determined by using a Gamma value adjusting method according to the embodiment of the present invention.
In fig. 3 and 4, the horizontal axis represents gray scale (Z-axis coordinate in XYZ color space), and the vertical axis represents chromaticity coordinate of X-axis in XYZ color space or Y-chromaticity coordinate in XYZ color space, and both fig. 3 and 4 represent chromaticity values corresponding to R (red) in RGB system in the XYZ color space as the gray scale changes.
When the display screen displays, the chromatic aberration of the high gray scale is generally very small, and the chromatic aberration is large and generally in the low gray scale, so that the above processing can be performed only on the low gray scale (such as 1-60) included in the overlapped screen in the above embodiment, which can save the workload.
In the embodiment provided by the invention, the color difference of the overlapped screen can be controlled in the set color difference range through the processing mode, and the color difference of the overlapped screen is reduced, so that the low gray scale color saturation is improved, the color gamut of the overlapped screen is further improved, and the image displayed by the overlapped screen is more vivid.
Besides the method for determining whether the color difference displayed by the overlapped screen is in the set range, the method can also be realized by adopting the following method according to the chromatic value corresponding to each gray scale to determine whether the color difference displayed by the overlapped screen is in the set color difference range:
drawing the chromatic values corresponding to all the gray scales into a gray scale change curve graph of the overlapped screen; determining an inflection point gray scale value corresponding to an inflection point of jump of a chromatic value from a gray scale change curve graph; judging whether the inflection point gray scale value is larger than a preset gray scale value or not; the preset gray scale value is a maximum gray scale value corresponding to a maximum color difference value of a set color difference range; and if the inflection point gray scale value is smaller than the preset gray scale value, determining that the color difference displayed by the screen folding is within the set range.
For example, please refer to fig. 5, which is a schematic diagram of an inflection point in a Gamma-corrected gray-scale variation curve according to an embodiment of the present invention. Fig. 5 shows an inflection point on the basis of fig. 4. The jump of the chromaticity value may refer to a difference between chromaticity values corresponding to two (or more) adjacent gray levels in the same coordinate system, or a difference between values of the same color component (e.g., red) corresponding to two (or more) adjacent gray levels, and for convenience of viewing, the red color component is illustrated in fig. 5 as an example. Explaining by the difference value of the same color component (such as red) corresponding to the adjacent two-level gray scale, searching the difference value of the adjacent two-level gray scale with the difference value of the first adjacent two-level gray scale being smaller than the red component jump threshold (the value is a preset value) from the low gray scale to the high gray scale in the difference values of the chromatic values corresponding to all the adjacent two-level gray scale calculated from the low gray scale to the high gray scale, and taking the low gray scale and the red component value of the corresponding adjacent two-level gray scale in the difference value as the inflection point of the chromatic jump under the red component.
Naturally, other methods may also be used to determine the inflection point, such as calculating a fitting function of a gray scale change curve, deriving the fitting function, determining a gray scale corresponding to the inflection point, or finding out the inflection point in a gray scale change curve graph by using an image processing method and determining a corresponding gray scale value.
Assuming that the color difference Δ E <2 that the user wants to display the overlay screen, in the coordinate system and the color components shown in fig. 5, when Δ E is 2, the corresponding gray scale value is 27, and the preset gray scale value is 27. Therefore, after a gray scale change curve graph (as shown in fig. 4) obtained after Gamma correction is drawn on the overlapped screen, only the inflection point (as shown in fig. 5) with the jump of the chromaticity value is needed to be found, and the gray scale value (i.e., the inflection point gray scale value) corresponding to the inflection point is obtained, and whether the color difference displayed by the overlapped screen is within the set range can be determined by judging whether the gray scale value of the inflection point is smaller than the preset gray scale value.
If the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the chromatic aberration displayed by the screen folding is not in the set range; and adjusting the first Gamma value and the second Gamma value until the inflection point gray-scale value is less than or equal to a preset gray-scale value.
For example, if it is determined that the current displayed color difference of the overlay screen is not within the set range according to the inflection point determined in fig. 5, the first Gamma value and the second Gamma value need to be adjusted, the processing procedures of steps 201 to 203 are executed again by using the adjusted first Gamma value and the adjusted second Gamma value, and if it is determined that the displayed color difference of the overlay screen is within the set range after the processing, the adjusted first Gamma value and the adjusted second Gamma value are respectively used as the final used Gamma values of the main screen and the secondary screen in the overlay screen. If the color difference displayed by the fixed screen folding is not in the set range after the adjustment, the Gamma value used last time is continuously adjusted until the color difference displayed by the screen folding is in the set range.
The adjustment of the first Gamma value and the second Gamma value can be realized by adopting the following two ways:
the first mode is as follows: increasing the first Gamma value by a set value to obtain an adjusted first Gamma value; and reducing the second Gamma value by a set value to obtain the adjusted second Gamma value.
For example, the standard Gamma value of the stacked screen is 2.3, when Gamma correction is performed for the first time, the first Gamma value used by the main screen is 1.5, the second Gamma value used by the sub-screen is 0.8, and the result obtained after the Gamma correction for the first time is that the chromatic aberration displayed by the stacked screen is not within the set range, the first Gamma value and the second Gamma value are adjusted, if the set value is 0.1, when Gamma correction is performed for the second time, the first Gamma value used by the main screen is 1.4, the second Gamma value used by the sub-screen is 0.9, and the result obtained after the Gamma correction for the second time is that the chromatic aberration displayed by the stacked screen is within the set range, the first Gamma value finally used by the stacked screen is determined to be 1.4, and the second Gamma value is determined to be 0.9 and is stored in the stacked screen.
The second mode is as follows: increasing the first Gamma value by a set value to obtain an adjusted first Gamma value; and reducing the second Gamma value by a set value to obtain the adjusted second Gamma value.
For example, the standard Gamma value of the stacked screen is 2.3, when Gamma correction is performed for the first time, the first Gamma value used by the main screen is 1.5, the second Gamma value used by the sub-screen is 0.8, and the result obtained after the Gamma correction for the first time is that the chromatic aberration displayed by the stacked screen is not within the set range, the first Gamma value and the second Gamma value are adjusted, if the set value is 0.1, when Gamma correction is performed for the second time, the first Gamma value used by the main screen is 1.6, the second Gamma value used by the sub-screen is 0.7, and the result obtained after the Gamma correction for the second time is that the chromatic aberration displayed by the stacked screen is within the set range, the first Gamma value finally used by the stacked screen is determined to be 1.6, and the second Gamma value is determined to be 0.7 and is stored in the stacked screen.
In addition to the above-mentioned directly using the first Gamma value and the second Gamma value as the main screen and the sub screen in the overlay screen for Gamma correction, the main screen and the sub screen may also use the inflection point as a demarcation point to allow the gray scales before and after the inflection point to be corrected using different Gamma values, and the specific processing method is as follows:
gamma correction of the main screen: dividing the gray scale change curve into a low gray scale stage curve and a high gray scale stage curve from an inflection point; controlling the main screen to carry out Gamma correction on the gray scale contained in the high gray scale section curve by using the first Gamma value; controlling the main screen to use the third Gamma value to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the third Gamma value is smaller than the first Gamma value.
Gamma correction of the auxiliary screen: controlling the secondary screen to carry out Gamma correction on the gray scale contained in the high gray scale section curve by using a second Gamma value; controlling the auxiliary screen to carry out Gamma correction on the gray scale contained in the low gray scale curve by using the fourth Gamma value; and the fourth Gamma value is the difference value between the standard Gamma value and the third Gamma value.
Fig. 6 is a schematic sectional view of a gray scale variation curve according to an embodiment of the invention. In FIG. 6, the portions of the gray scale change curves corresponding to the low gray levels (0-18) are curves of the low gray levels, and the portions of the gray scale change curves corresponding to the high gray levels (19-255) are curves of the low gray levels, which are defined by the inflection points. After the first Gamma value finally used by the main screen is determined by using the mode, a third Gamma value smaller than the first Gamma value can be set for the low-gray stage curve, and then the main screen is set as: when Gamma correction is carried out, the third Gamma value is used for carrying out Gamma correction on the gray scale included in the low gray stage curve, and the first Gamma value is used for carrying out Gamma correction on the gray scale included in the high gray stage curve.
Correspondingly, the auxiliary screen uses a fourth Gamma value when performing Gamma correction on the gray scale included by the low gray stage curve, and the fourth Gamma value is the difference value between the standard Gamma value and the third Gamma value, so that the main screen is set as: when Gamma correction is carried out, the fourth Gamma value is used for carrying out Gamma correction on the gray scale included in the low gray scale stage curve, and the second Gamma value is used for carrying out Gamma correction on the gray scale included in the high gray scale stage curve.
Fig. 7 is a gray scale variation graph of the main screen and the sub-screen after Gamma correction. It can be seen from the figure that after the main screen and the auxiliary screen adopt different Gamma values to correct the low-gray stage curve and the high-gray stage curve, the inflection point in the gray scale change curve moves towards the low-gray stage direction, so that on the premise that the standard Gamma value is met in the overlapped screen, the color gamut of the low gray scale is improved, and the display chromatic aberration is reduced.
After determining a first Gamma value and a second Gamma value, or a first Gamma value and a third Gamma value, a second Gamma value and a fourth Gamma value, which are finally used by a main screen and an auxiliary screen in a screen stack, the Gamma values can be stored in the screen stack for use during working according to the actual requirements of the screen stack, and a corresponding Gamma correction table can be generated according to the Gamma values, so that the main screen and the screen stack can be controlled to inquire corrected values according to respective Gamma correction tables during working of the screen stack, and corrected images can be displayed.
Based on the same inventive concept, an embodiment of the invention provides a stacked screen, wherein the stacked screen comprises a main screen and an auxiliary screen which are arranged in a stacked mode, and the Gamma value of the stacked screen is adjusted and calibrated by the method.
In one possible embodiment, when a quantum dot film is used in the stacked screen for image display, the stacked screen further includes:
and the automatic chromaticity control circuit is used for automatically controlling the chromaticity of the image displayed by the screen stack.
Fig. 8 is a gray scale variation graph before ACC correction is performed on the stacked screen of the film containing quantum dots provided by the embodiment of the present invention, and fig. 9 is a gray scale variation graph after ACC correction is performed on the stacked screen of the film containing quantum dots provided by the embodiment of the present invention. The use of the quantum dot film in the screen stack can improve the color gamut of the screen stack display, and as can be seen from fig. 8, the problem of drastic color component change (as shown in the portion of the elliptic curve in fig. 8) also occurs at the same time, and in order to overcome the problem, an Automatic Chroma Control (ACC) circuit may be provided in the screen stack or the T-CON (logic board) of the screen stack to correct (i.e., perform Automatic Chroma Control) the ACC, and the gray scale change curve obtained after correction is as shown in fig. 9, and the color component does not have drastic change.
By arranging the automatic chromaticity control circuit in the screen stack containing the quantum dot film, the color component can be prevented from being changed violently, and the display effect of the screen stack is improved.
Based on the same inventive concept, an embodiment of the present invention provides a device for Gamma value adjustment in a stacked screen, where the stacked screen includes a main screen and an auxiliary screen that are stacked, and a specific implementation manner of Gamma value adjustment used in the stacked screen may refer to the description of the method embodiment, and repeated details are not repeated, please refer to fig. 10, and the device includes:
the correction unit 1001 is used for controlling the main screen and the auxiliary screen to perform Gamma correction on the single gray scale image corresponding to each gray scale contained in the overlapped screen; the Gamma values adopted by the main screen and the auxiliary screen for Gamma correction are different, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
the acquisition unit 1002 is configured to acquire a chromatic value of the corrected single gray scale image corresponding to each gray scale displayed by the stacked screen;
a determining unit 1003, configured to determine whether a color difference displayed by the stacked screen is within a set color difference range according to a chromatic value corresponding to each gray scale, and if so, determine a Gamma value adopted by the main screen and the auxiliary screen as a Gamma value to be finally used; if the color difference displayed by the screen folding is not within the set color difference range, adjusting the Gamma values adopted by the main screen and the auxiliary screen, and performing Gamma correction on the single gray scale image corresponding to each gray scale contained in the screen folding again until the color difference displayed by the screen folding is within the set color difference range.
In a possible implementation, the correction unit 1001 is specifically configured to:
controlling the main screen to perform Gamma correction on the single gray scale image by adopting a first Gamma value;
meanwhile, controlling the auxiliary screen to perform Gamma correction on the single gray scale image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
In a possible implementation, the determining unit 1003 is further configured to:
drawing the chromatic values corresponding to all the gray scales into a gray scale change curve graph of the folded screen;
determining an inflection point gray scale value corresponding to an inflection point of jump of a chromatic value from the gray scale change curve graph;
judging whether the inflection point gray scale value is larger than a preset gray scale value or not; the preset gray scale value is a maximum gray scale value corresponding to a maximum color difference value of the set color difference range;
and if the inflection point gray scale value is smaller than the preset gray scale value, determining that the color difference displayed by the overlapped screen is within the set range.
In a possible implementation, the determining unit 1003 is further configured to:
if the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the color difference displayed by the overlapped screen is not in the set range;
and adjusting the first Gamma value and the second Gamma value until the inflection point gray scale value is less than or equal to the preset gray scale value.
In a possible implementation, the determining unit 1003 is further configured to:
reducing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and increasing the second Gamma value by the set value to obtain the adjusted second Gamma value.
In a possible implementation, the determining unit 1003 is further configured to:
increasing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and reducing the second Gamma value by the set value to obtain an adjusted second Gamma value.
In a possible implementation, the correction unit 1001 is further configured to:
dividing the gray scale change curve into a low gray stage curve and a high gray scale stage curve from the inflection point;
controlling the main screen to use the first Gamma value to carry out Gamma correction on the gray scale contained in the high gray scale section curve;
controlling the third Gamma value for the main screen to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the third Gamma value is less than the first Gamma value.
In a possible implementation, the correction unit 1001 is further configured to:
controlling the secondary screen to use the second Gamma value to carry out Gamma correction on the gray scale contained in the high gray scale section curve;
controlling the fourth Gamma value for the auxiliary screen to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the fourth Gamma value is a difference between the standard Gamma value and the third Gamma value.
Based on the same inventive concept, the embodiment of the invention provides a device for adjusting Gamma values in a stacked screen, which comprises: at least one processor, and
a memory coupled to the at least one processor;
the memory stores instructions executable by the at least one processor, and the at least one processor executes the instructions stored in the memory to perform the Gamma value adjustment method.
Based on the same inventive concept, an embodiment of the present invention further provides a readable storage medium, including:
a memory for storing a plurality of data to be transmitted,
the memory is configured to store instructions that, when executed by the processor, cause the apparatus including the readable storage medium to perform the Gamma value adjustment method as described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (13)
1. A method for adjusting Gamma value in a stacked screen, wherein the stacked screen comprises a main screen and an auxiliary screen which are arranged in a stacked mode, and the method is characterized by comprising the following steps:
controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray scale image corresponding to each gray scale contained in the overlapped screen; the Gamma values adopted by the main screen and the auxiliary screen for Gamma correction are different, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
collecting the chromatic value of the corrected single gray scale image corresponding to each gray scale displayed by the overlapped screen;
determining whether the color difference displayed by the overlapped screen is within a set color difference range according to the chromatic value corresponding to each gray scale, and if so, determining the Gamma values adopted by the main screen and the auxiliary screen as the Gamma values finally used; if the color difference displayed by the screen folding is not within the set color difference range, adjusting the Gamma values adopted by the main screen and the auxiliary screen, and performing Gamma correction on the single gray scale image corresponding to each gray scale contained in the screen folding again until the color difference displayed by the screen folding is within the set color difference range.
2. The method of claim 1, wherein controlling the primary screen and the secondary screen to perform Gamma correction on a single gray scale image corresponding to each gray scale contained in the overlay screen comprises:
controlling the main screen to perform Gamma correction on the single gray scale image by adopting a first Gamma value;
meanwhile, controlling the auxiliary screen to perform Gamma correction on the single gray scale image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
3. The method of claim 2, wherein determining whether the color difference of the overlay display is within a set color difference range according to the chromaticity value corresponding to each gray scale comprises:
drawing the chromatic values corresponding to all the gray scales into a gray scale change curve graph of the folded screen;
determining an inflection point gray scale value corresponding to an inflection point of jump of a chromatic value from the gray scale change curve graph;
judging whether the inflection point gray scale value is larger than a preset gray scale value or not; the preset gray scale value is a maximum gray scale value corresponding to a maximum color difference value of the set color difference range;
and if the inflection point gray scale value is smaller than the preset gray scale value, determining that the color difference displayed by the overlapped screen is within the set range.
4. The method of claim 3, wherein after determining whether the inflection point grayscale value is greater than a preset grayscale value, further comprising:
if the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the color difference displayed by the overlapped screen is not in the set range;
and adjusting the first Gamma value and the second Gamma value until the inflection point gray scale value is less than or equal to the preset gray scale value.
5. The method of claim 4, wherein adjusting the first Gamma value and the second Gamma value comprises:
reducing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and increasing the second Gamma value by the set value to obtain the adjusted second Gamma value.
6. The method of claim 4, wherein adjusting the first Gamma value and the second Gamma value comprises:
increasing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and reducing the second Gamma value by the set value to obtain an adjusted second Gamma value.
7. The method of any one of claims 3-6, wherein controlling the main screen to perform Gamma correction on the single gray scale image using the first Gamma value comprises:
dividing the gray scale change curve into a low gray stage curve and a high gray scale stage curve from the inflection point;
controlling the main screen to use the first Gamma value to carry out Gamma correction on the gray scale contained in the high gray scale section curve;
controlling the third Gamma value for the main screen to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the third Gamma value is less than the first Gamma value.
8. The method of claim 7, wherein controlling the secondary screen to Gamma correct the single gray scale image with a second Gamma value comprises:
controlling the secondary screen to use the second Gamma value to carry out Gamma correction on the gray scale contained in the high gray scale section curve;
controlling the fourth Gamma value for the auxiliary screen to carry out Gamma correction on the gray scale contained in the low gray scale curve; wherein the fourth Gamma value is a difference between the standard Gamma value and the third Gamma value.
9. A stacked screen comprising a primary screen and a secondary screen arranged in a stack, wherein the stacked screen is Gamma-calibrated by the method of any one of claims 1 to 8.
10. A screen stack as recited in claim 9, wherein when a quantum dot film is employed in the screen stack for image display, the screen stack further comprises:
and the automatic chromaticity control circuit is used for automatically controlling the chromaticity of the image displayed by the screen stack.
11. The utility model provides a device of Gamma value timing in folding screen, fold the main screen and vice screen that the screen set up including range upon range of, its characterized in that includes:
the correction unit is used for controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray scale image corresponding to each gray scale contained in the overlapped screen; the Gamma values adopted by the main screen and the auxiliary screen for Gamma correction are different, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
the acquisition unit is used for acquiring the chromatic value of the corrected single-gray-scale image corresponding to each gray scale displayed by the folding screen;
the determining unit is used for determining whether the color difference displayed by the overlapped screen is within a set color difference range according to the chromatic value corresponding to each gray scale, and if so, determining the Gamma values adopted by the main screen and the auxiliary screen as the Gamma values finally used; if the color difference displayed by the screen folding is not within the set color difference range, adjusting the Gamma values adopted by the main screen and the auxiliary screen, and performing Gamma correction on the single gray scale image corresponding to each gray scale contained in the screen folding again until the color difference displayed by the screen folding is within the set color difference range.
12. The utility model provides a device that Gamma value was adjusted and correct in folding screen which characterized in that includes:
at least one processor, and
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of any one of claims 1-8 by executing the instructions stored by the memory.
13. A readable storage medium, comprising a memory,
the memory is for storing instructions that, when executed by the processor, cause an apparatus comprising the readable storage medium to perform the method of any of claims 1-8.
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