CN111754906B - Method for detecting brightness uniformity of curved surface display screen - Google Patents
Method for detecting brightness uniformity of curved surface display screen Download PDFInfo
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- CN111754906B CN111754906B CN202010614913.8A CN202010614913A CN111754906B CN 111754906 B CN111754906 B CN 111754906B CN 202010614913 A CN202010614913 A CN 202010614913A CN 111754906 B CN111754906 B CN 111754906B
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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Abstract
The invention discloses a method for detecting brightness uniformity of a curved surface display screen. The method for detecting the brightness uniformity of the curved surface display screen provided by the embodiment of the invention comprises the following steps: acquiring a first gray image of a curved surface display screen to be tested for displaying a preset test image, wherein the first gray image has a first direction along the bending direction of the curved surface display screen to be tested; selecting a reference line which penetrates through the first gray level image at least along a first direction on the first gray level image; obtaining a compensation rule based on the change rule of the gray value of each point on the reference line; compensating the gray value of each point of the first gray image based on a compensation rule to obtain a second gray image; and obtaining the brightness uniformity of the curved surface display screen to be detected according to the gray uniformity of the second gray image. According to the method for detecting the brightness uniformity of the curved-surface display screen, the brightness uniformity of the curved-surface display screen can be detected more accurately.
Description
Technical Field
The invention relates to the field of display, in particular to a method for detecting brightness uniformity of a curved surface display screen.
Background
At present, display screens (e.g., liquid crystal display screens, organic light emitting diode display screens, etc.) are rapidly developing from flat display to curved display. The Curved Display screen (Curved Display) is an arc design with the whole screen bent towards the direction of a viewer, can provide a wide visual angle and a wide panoramic image effect, and reduces the distortion degree of off-axis viewing when viewing at a close distance; or the entire screen may be curved away from the viewer to provide a larger viewing area and an omni-directional viewing angle.
However, the shape of the curved display screen is changed compared with that of the flat display screen, so that the brightness uniformity detection device of the existing flat display screen cannot accurately detect the brightness uniformity of the curved display screen.
Disclosure of Invention
The invention provides brightness uniformity detection for a curved surface display screen, which can more accurately detect the brightness uniformity of the curved surface display screen.
In a first aspect, an embodiment of the present invention provides a method for detecting luminance uniformity of a curved-surface display screen, including: acquiring a first gray image of a curved surface display screen to be tested, wherein the first gray image displays a preset test image and has a first direction along the bending direction of the curved surface display screen to be tested; selecting a reference line which penetrates through the first gray level image at least along a first direction on the first gray level image; obtaining a compensation rule based on the change rule of the gray value of each point on the reference line; compensating the gray value of each point of the first gray image based on a compensation rule to obtain a second gray image; and obtaining the brightness uniformity of the curved surface display screen to be detected according to the gray uniformity of the second gray image.
According to the method for detecting the brightness uniformity of the curved surface display screen, the reference line is selected on the obtained first gray scale image of the curved surface display screen to be detected, the compensation rule is obtained based on the change rule of the gray scale values of all points on the reference line, the gray scale values of all points of the first gray scale image are compensated based on the compensation rule, the brightness uniformity of the curved surface display screen to be detected is obtained through the gray scale uniformity of the compensated second gray scale image, the brightness interference caused by the curved surface shape of the curved surface display screen to be detected relative to the flat surface display screen can be compensated, and the brightness uniformity of the curved surface display screen can be detected more accurately through the conventional flat surface display screen brightness uniformity detection equipment.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings in which like or similar reference characters refer to like or similar parts and which are not necessarily drawn to scale.
FIG. 1 shows a schematic view of a concavely curved display screen according to an embodiment of the invention;
FIG. 2 shows a schematic view of a convexly curved display screen according to an embodiment of the invention;
FIG. 3 is a flow chart of a method for detecting luminance uniformity of a curved display screen according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a first grayscale image according to an embodiment of the invention;
FIG. 5 is a sub-flowchart of one embodiment of step S100 of a curved display screen brightness uniformity detection method according to one embodiment of the present invention;
FIG. 6 is a sub-flowchart of one embodiment of step S120 of a method for detecting luminance uniformity of a curved display screen according to one embodiment of the present invention;
FIG. 7 shows a schematic diagram of a first captured image according to an embodiment of the invention;
FIG. 8 shows a schematic diagram of a binary image of a first acquired image according to an embodiment of the invention;
FIG. 9 is a sub-flowchart illustrating another embodiment of step S120 of a method for detecting luminance uniformity of a curved display screen according to an embodiment of the present invention;
FIG. 10 is a sub-flowchart illustrating another embodiment of the step S100 of the method for detecting the uniformity of brightness of a curved display screen according to one embodiment of the present invention;
FIG. 11 shows a schematic diagram of a first grayscale image and a reference line according to an embodiment of the invention;
FIG. 12 is a sub-flowchart of step S300 of a method for detecting luminance uniformity of a curved display screen according to an embodiment of the present invention;
FIG. 13 is a sub-flowchart illustrating the step S500 of the method for detecting the uniformity of brightness of a curved display screen according to one embodiment of the present invention;
FIG. 14 is a flow chart of a method for detecting luminance uniformity of a curved display screen according to another embodiment of the present invention;
FIG. 15 is a flowchart illustrating a step S600 of a method for detecting luminance uniformity of a curved display panel according to another embodiment of the present invention;
FIG. 16 is a flow chart illustrating a method for detecting luminance uniformity of a curved display panel according to another embodiment of the present invention;
fig. 17 is a flowchart illustrating a step S700 of a method for detecting luminance uniformity of a curved display according to another embodiment of the present invention.
In the figure:
100-an optical test device; 200-curved surface display screen; 300-first grayscale image; 400-an environment image; 301-a first grayscale image in a binary image; 401 — an environment image in a binary image; 500-reference line; 510-edge area; 520-central region.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The detection of the brightness uniformity of the display screen generally comprises a 9-point uniformity measurement method and a comprehensive uniformity measurement method. The 9-point uniformity measurement method is to select the brightness of 9 representative points (or areas) on the display screen to calculate the brightness uniformity, and the brightness of all the areas on the display screen is not measured, so the detection is not comprehensive enough. The overall uniformity measurement method is to acquire the picture of the whole screen through optical test equipment such as a camera and then calculate the brightness uniformity of the display screen according to the brightness difference of each pixel point of the picture.
The curved surface display screen can detect the brightness uniformity through a 9-point uniformity measurement method, a radial point taking method is needed, namely, the detection is carried out along the normal direction of the curved surface where each point is located, an optical testing device needs to change angles for measurement, and the 9-point uniformity measurement method of the curved surface display screen cannot completely indicate the brightness uniformity of the curved surface display screen due to incomplete detection.
The optical test equipment of the comprehensive uniformity measurement method can accurately measure the brightness uniformity of the flat display screen. The shape of the curved display screen changes in space relative to the flat display screen, the picture changes from a plane picture to a three-dimensional picture, and the picture obtained by an optical test device such as a camera is still a plane, so that the picture with gradually changed brightness along the direction of the curved surface is formed, and the measurement of the brightness uniformity of the curved display screen becomes inaccurate.
For example, when the curved surface display screen is protruding towards the optical test equipment, extra transverse component can appear in the light that curved surface display screen center both sides were sent, lead to can be towards the light of optical test equipment when the flat display screen and disperse to both sides, astigmatism effect appears for luminance can be dark when the picture that obtains is shot to the optical test equipment when the luminance of curved surface display screen center both sides compares the flat display screen, causes the interference to the detection of curved surface display screen luminance homogeneity, influences detection accuracy.
For example, when the curved surface display screen is concave away from the optical test equipment, light emitted by the curved surface display screen can converge towards the center, so that a light condensation effect occurs, and brightness of the center of the curved surface display screen in a picture obtained by shooting by the optical test equipment can become brighter compared with brightness of the flat display screen, so that interference is caused on brightness uniformity detection of the curved surface display screen, and detection accuracy is affected.
In order to solve the above problems, embodiments of the present invention provide a method for detecting brightness uniformity of a curved display panel, which can compensate the above interference factors to detect the brightness uniformity of the curved display panel more accurately.
The method for detecting the brightness uniformity of the curved surface display screen provided by the embodiment of the invention can be used for detecting the brightness uniformity of the curved surface display screen. The Display screen may be an Organic Light-Emitting Diode (OLED) Display screen, a Liquid Crystal Display (LCD) Display screen, or the like. A display screen using a Light Emitting Diode (LED) device may be used, for example, a Micro-LED (Micro-LED) display screen.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a concave display screen according to an embodiment of the invention, and fig. 2 is a schematic diagram of a convex display screen according to an embodiment of the invention.
In the embodiment of the invention, the curved surface display screen is provided with a display surface. The curved display screen may be a concave curved display screen or a convex curved display screen that is curved around the reference line. As shown in fig. 1, the concave display screen 200 is a display screen that is concave on the side opposite to the display surface. As shown in fig. 2, the convex curved display 200 is a display that is convex toward the side where the display surface is located. The optical test equipment 100 faces the display surface of the curved display screen 200.
Referring to fig. 3 and 4 together, fig. 3 is a flowchart illustrating a method for detecting brightness uniformity of a curved display panel according to an embodiment of the invention, and fig. 4 is a schematic diagram illustrating a first gray image according to an embodiment of the invention.
The method for detecting the brightness uniformity of the curved surface display screen provided by the embodiment of the invention comprises the following steps:
s100: the method comprises the steps of obtaining a first gray image of a curved surface display screen to be tested, wherein the first gray image displays a preset test image and has a first direction along the bending direction of the curved surface display screen to be tested.
The preset test image may be a white image or a black image. The preset test image may also be another monochrome image. Herein, the "first gray image" and the "second gray image" refer to images displaying gray scales, i.e., images having black and white colors and a staircase gray color between the black and white colors. In a grayscale image, the grayscale value of each sub-pixel generally ranges from 0 to 255, white is 255, and black is 0. The gray value of each area in the image can be used for representing the brightness value of the corresponding area in the curved surface display screen to be detected.
The bending direction of the curved surface display screen to be measured can intersect with the reference line of the curved surface display screen, for example, the bending direction of the curved surface display screen to be measured is perpendicular to the reference line of the curved surface display screen.
The first gray image may have a plurality of pixels arranged in rows and columns along a first direction and a second direction, where the second direction intersects the first direction, for example, the second direction is perpendicular to the first direction. Each pixel point has a column coordinate varying along a first direction and a row coordinate varying along a second direction.
As shown in fig. 4, the first gray image 300 has a gray value change, and the gray value change is schematically shown by rectangular boxes filled with different colors in fig. 4. It should be understood that the gray-scale value of the first gray-scale image 300 is gradually changed, the gray-scale value in each rectangular frame may be gradually changed, and the gray-scale value between the rectangular frames may also be gradually changed.
The first gray image 300 may have a first direction Y and a second direction X that are vertically disposed. Each pixel point has a column coordinate varying along a first direction Y and a row coordinate varying along a second direction X.
For example, a pixel is { X ═ 9, Y ═ 15}, where X ═ 9 is the row coordinate of the pixel, and Y ═ 15 is the column coordinate of the pixel.
Referring to fig. 5, fig. 5 is a sub-flowchart of an embodiment of the step S100 of the method for detecting the uniformity of the brightness of the curved display panel according to the embodiment of the invention.
Alternatively, as shown in fig. 5, step S100 may include:
s110: and taking a picture of the curved surface display screen to be detected to obtain a first collected image of the gray scale.
The curved display screen to be tested can be photographed, for example, by an optical test device such as a camera. The optical test equipment can face the curved surface display screen to be tested and is away from the curved surface display screen to be tested by a preset shooting distance, so that the optical test equipment can shoot the complete curved surface display screen to be tested. The optical test equipment and the curved surface display screen to be tested are in a dark environment, such as a darkroom, so as to avoid the influence of ambient light on the test.
The first captured image in grayscale may be obtained by a grayscale optical test device (e.g., a black and white camera). The first collected image of the gray scale can also be obtained by the gray scale processing after being photographed by the optical test equipment.
The first collected image of the gray scale may include a curved display screen to be measured and an environment image surrounding the curved display screen to be measured.
S120: and acquiring the outline of the curved surface display screen to be detected in the first collected image. So as to separate the curved surface-measuring display screen from the environment image.
Referring to fig. 6 to 8 together, fig. 6 is a sub-flowchart of an embodiment of step S120 of the method for detecting the brightness uniformity of the curved display panel according to an embodiment of the present invention, fig. 7 is a schematic diagram of a first captured image according to an embodiment of the present invention, and fig. 8 is a schematic diagram of a binary image of the first captured image according to an embodiment of the present invention.
In some optional embodiments, as shown in fig. 6, step S120 may include:
s121: a binary image of the first acquired image is generated.
As shown in fig. 7, the first captured image includes a first grayscale image 300 and an ambient image 400.
Selecting one of the gray-scale values 0 to 255 as a threshold, and converting the gray-scale value of the pixel point of which the gray-scale value is greater than or equal to the threshold in the first collected image into 1, namely white; and converting the gray scale value of the pixel point with the gray scale value smaller than the threshold value in the first collected image into 0, namely converting the pixel point into white, so as to generate a binary image only containing two gray scales of black and white. As shown in fig. 8, the first gray scale image 301 in the binary image is a white gray scale, and the environment image 401 in the binary image is a black gray scale.
S122: the contour of the first grayscale image is located based on the binary image. Because the shooting environment is in a dark light state, the gray value of the environment image part in the first collected image is smaller than the gray value of the curved surface display screen part to be detected, namely the image part is darker than the curved surface display screen part to be detected, and the outline of the first gray image corresponding to the curved surface display screen to be detected is positioned according to the black and white edges of the binary image.
Referring to fig. 9, fig. 9 is a sub-flowchart illustrating another embodiment of the step S120 of the method for detecting the uniformity of the brightness of the curved display panel according to an embodiment of the present invention.
In some optional embodiments, as shown in fig. 9, step S120 may further include:
s123: the first captured image is subjected to first filtering processing to smooth the first captured image. The first filtering may be gaussian filtering. Step S123 may be located before step S121 to remove noise of the first captured image.
S130: a first grayscale image is extracted based on the contour. The first grayscale image may be truncated by the contour acquired in step S122, for example.
Referring to fig. 10, fig. 10 is a sub-flowchart of another embodiment of the step S100 of the method for detecting the uniformity of brightness of the curved display panel according to an embodiment of the invention.
In some optional embodiments, as shown in fig. 10, step S100 may further include:
s140: the first grayscale image is geometrically corrected to obtain a rectangular first grayscale image.
The curved surface display screen to be measured can be rectangular when being unfolded. Because the distances of the areas of the curved surface display screen to be tested relative to the optical test equipment are different, the first gray image obtained by shooting through the optical test equipment is distorted and is not rectangular. The first gray image may be geometrically corrected to a rectangle to facilitate a compensation operation of a subsequent step.
Referring to fig. 11, fig. 11 is a schematic diagram illustrating a first grayscale image and a reference line according to an embodiment of the invention.
S200: and selecting a reference line which penetrates through the first gray-scale image at least along the first direction on the first gray-scale image. For example, as shown in fig. 11, a reference line 500 is selected on the first gray image 300.
The reference line may be manually selected. The reference line can be selected according to the area with uniform gray value change on the first gray image, so that the reference line penetrates through the area with uniform gray value change on the first gray image, and the gray value change caused by the curved surface can be reflected by each point on the reference line without being influenced by the gray value change caused by the uneven brightness of the display screen. Reference lines that do not cross the Mura area can be chosen, for example, by the human eye from a picture taken by an optical test device (e.g., a camera). The Mura area (as shown in fig. 11) is an area where the gray scale of the first gray scale image is uneven due to the uneven brightness of the curved display screen to be measured. The reference line may extend through two opposite sides of the first gray scale image along the first direction, so that each point of the reference line can correspond to all column coordinates of the first gray scale image. The reference line may intersect the first direction (diagonal line) or may be in the same direction as the first direction (flat line). The reference line may also be a curve that intersects opposite sides of the first gray image in the first direction. The reference lines of the oblique lines and the reference lines of the curved lines may be projected as flat lines of the same row coordinate X according to a row coordinate X projection to facilitate the acquisition of the compensation rules in the following steps. The reference line and the first direction are illustrated as an example.
The reference line may have an edge region adjoining an edge of the first gray image in the first direction and a center region including a midpoint of the reference line in the first direction. For example, as shown in fig. 11, the reference line 500 may include an edge region 510 and a center region 520. The reference line 500 is a line segment located in the first gray image 300, and the reference line 500 includes two edge regions 510 and a central region 520, the central region 520 is sandwiched between the two edge regions 510, and the central region 520 may not be connected to the edge regions 510. Wherein the reference line 500 is shown as a flat line in the same direction as the first direction, the reference line 501 is shown as a diagonal line, the reference line 502 is shown as a curved line, and the reference line 501 and the reference line 502 can be projected to the reference line 500 by a line coordinate X-projection, so as to facilitate the acquisition of the compensation rule of the following steps.
S300: and obtaining a compensation rule based on the change rule of the gray value of each point on the reference line.
Referring to fig. 12, fig. 12 is a sub-flowchart of the step S300 of the method for detecting the uniformity of the brightness of the curved display panel according to an embodiment of the invention.
In some optional embodiments, as shown in fig. 12, step S300 may include:
s310: and acquiring each pixel point on the reference line, and selecting the reference pixel point on the reference line.
All the pixel points on the reference line can be obtained to obtain the change rule of the gray value of each point on the reference line. And the reference pixel point is used as a reference value of the change rule of the gray value of each point on the reference line. The change rule of the gray value of each point on the reference line can be the difference change of the gray value of each point on the reference line relative to the reference pixel point.
And when the curved surface display screen to be detected is a concave curved surface display screen, the reference pixel point is selected from the edge area. When the curved surface display screen to be tested is a concave curved surface display screen, light rays emitted by the concave curved surface display screen converge towards the center, so that a light condensation effect occurs, the brightness of the center of the concave curved surface display screen in a picture obtained by shooting through the optical test equipment is brighter than that of a flat display screen, namely, the gray value of the central area of the reference line is higher, and the gray value of the edge area is relatively accurate. Alternatively, the reference pixel point may be an edge point of the first grayscale image. Or alternatively, the reference pixel point may also be a point adjacent to the edge point of the first grayscale image.
And when the curved surface display screen to be detected is a convex curved surface display screen, the reference pixel point is selected from the central area. When the curved display screen to be tested is a convex curved display screen, an astigmatism effect occurs, so that the brightness of the two sides of the center of the curved display screen in the picture obtained by the optical test equipment becomes darker than that of the flat display screen, namely, the gray value of the edge area of the reference line is lower, and the gray value of the center area is relatively accurate. Alternatively, the reference pixel point may be a midpoint of the reference line. Or alternatively, the reference pixel point may also be a point adjacent to the midpoint of the reference line.
S320: and calculating the gray difference value between the gray value of each pixel point on the reference line and the gray value of the reference pixel point, and associating the gray difference value with the column coordinates of each pixel point on the reference line to obtain the change rule of the gray value of each pixel point on the reference line.
The gray value of each pixel point on the reference line and the gray value of the reference pixel point can be obtained.
When the reference pixel is selected from the edge regions and the reference line has two edge regions, the gray value of the reference pixel may be the gray value of the reference pixel selected from one of the edge regions, or may be the smaller or average of the gray values of the two points selected from the two edge regions.
For example, in a specific example, when the reference line is oriented in the same direction as the first direction, there are five pixels P1, P2, P3, P4, and P5 on the reference line, where the points P1{ X ═ 3, Y ═ 1}, P2{ X ═ 3, Y ═ 2}, P3{ X ═ 3, Y ═ 3}, P4{ X ═ 3, Y ═ 4}, P5{ X ═ 3, Y ═ 5 }. Each pixel point on the reference line has a gray value G, and the gray value G reflects the gray value of the first gray image. The grayscales G of P1 to P5 are P1{ G ═ 30}, P2{ G ═ 31}, P3{ G ═ 32}, P4{ G ═ 31}, and P5{ G ═ 30 }.
When the curved surface display screen to be tested is a concave curved surface display screen, the P1 is located in the edge area of the reference line, the P1 is selected as a reference pixel point, the difference value C between the gray values of the P2 to the P5 and the gray value of the P1 is calculated, and P2{ C ═ 1}, P3{ C ═ 2}, P4{ C ═ 1}, and P5{ C ═ 0} are obtained. The gray interpolation C is associated with the column coordinate Y of each pixel point on the reference line, i.e., P1{ Y is 1, C is 0}, P2{ Y is 2, C is 1}, P3{ Y is 3, C is 2}, P4{ Y is 4, C is 1}, P5{ Y is 5, C is 0 }. Therefore, the change rule of the gray value of each pixel point on the reference line along with the column coordinates is obtained. In some alternative embodiments, when both P1 and P2 are located in the edge region of the reference line, the difference C may also be obtained by the difference between the gray values of P2 to P5 and the gray value of P2.
When the curved surface display screen to be tested is a convex curved surface display screen, the P3 is located in the central area of the reference line, the P3 is selected as a reference pixel point, and the difference P1{ C-2 }, P2{ C-1 }, P4{ C-1 }, and P5{ C-2 } of the gray values of the P1, P2, P4 and P5 and the gray value of the P3 are calculated. The grayscale interpolation is associated with the column coordinates of each pixel on the reference line, i.e., P1{ Y ═ 1, C ═ 2}, P2{ Y ═ 2, C ═ 1}, P3{ Y ═ 3, C ═ 0}, P4{ Y ═ 4, C ═ 1}, and P5{ Y ═ 5, C ═ 2 }. Therefore, the change rule of the gray value of each pixel point on the reference line along with the column coordinate is obtained. In some alternative embodiments, when both P3 and P2 are located in the central region of the reference line, the difference C may also be obtained by the difference between the gray scale values of P1, P3, P4, and P5 and the gray scale value of P2.
S330: and taking the gray difference value corresponding to each column coordinate as a compensation value for compensating the gray value of the pixel point with the same column coordinate in the first gray image to obtain a compensation rule.
When the reference line is in the same direction as the first direction, the reference line is a row of pixel points in the first gray image. Because the gray scale unevenness caused by the curved surface has basically the same change rule of the gray scale value of each line of pixel points, the change rule of the gray scale value of each pixel point on the reference line is approximately the same as that of the gray scale values of the pixel points on other lines, and the pixel points with the same column coordinate can be compensated by adopting the same gray scale interpolation.
S400: and compensating the gray value of each point of the first gray image based on the compensation rule to obtain a second gray image.
The gray value compensation can be carried out on the reference line, and the gray value compensation can be carried out on other pixel points except the reference line in the first gray image.
And when the curved surface display screen to be detected is a concave curved surface display screen, subtracting the compensation value of the corresponding column coordinate from the gray value of the pixel point with the same column coordinate in the first gray image.
For example, the gray scale value of the reference line itself may be compensated, according to the compensation rule P1{ Y is 1, C is 0}, P2{ Y is 2, C is 1}, P3{ Y is 3, C is 2}, P4{ Y is 4, C is 1}, P5{ Y is 5, C is 0} for each point P1{ G is 30}, P2{ G is 31}, P3{ G is 32}, P4{ G is 31}, P5{ G is 30}, and P5{ G is 30} by subtracting C from the gray scale value G to obtain the compensated gray scale value G, P1 to P5 are compensated, P1{ G is 30}, P2G is 30G, P3{ 30} is 30G, P3683 { 30} is 30 { G } by subtracting C from the gray scale value G, P4{ 30} by P5{ 30 { G }, P1{ 30} by the compensation rule P3535 { P.
It is also possible to compensate for pixels other than the reference line in the first grayscale image, for example, a row of pixels in the first grayscale image is P6{ X ═ 2, Y ═ 1, G ═ 36}, P7{ X ═ 2, Y ═ 2, G ═ 34}, P8{ X ═ 2, Y ═ 3, G ═ 32}, P9{ X ═ 2, Y ═ 4, G ═ 30}, P10{ X ═ 2, Y ═ 5, G ═ 28 }. According to the compensation rule P1{ Y ═ 1, C ═ 0}, P2{ Y ═ 2, C ═ 1}, P3{ Y ═ 3, C ═ 2}, P4{ Y ═ 4, C ═ 1}, P5{ Y ═ 5, C ═ 0} are compensated, where the difference C is subtracted from the gray value G to obtain a compensated gray value G, and P6 to P10 after compensation are P6{ X ═ 2, Y ═ 1, G ═ 36}, P7{ X ═ 2, Y ═ 2, G ═ 33}, P8{ X ═ 2, Y ═ 3, G ═ 30}, P9{ X ═ 2, Y ═ 4, G ═ 6329 }, P10{ X ═ 2, Y ═ 5, G ═ 28}, G ═ 28. The pixel points of all the rows in the first grayscale image can be compensated according to the compensation method shown in this example, and then the second grayscale image is obtained.
And when the curved surface display screen to be detected is a convex curved surface display screen, adding the gray value of the pixel points with the same row coordinates in the first gray image to the compensation value of the corresponding row coordinates.
For example, the gray scale value of the reference line itself may be compensated, according to the compensation rule P1{ Y ═ 1, C ═ 2}, P2{ Y ═ 2, C ═ 1}, P3{ Y ═ 3, C ═ 0}, P4{ Y ═ 4, C ═ 1}, P5{ Y ═ 5, C ═ 2} for each point P1{ G ═ 30}, P2{ G ═ 31}, P3{ G ═ 32}, P4{ G ═ 31}, P5{ G ═ 30} on the reference line, wherein the compensated gray scale value G is obtained by adding the difference value C to the gray scale value G, the compensated P1 to P5 is obtained, P1{ G ═ 32, P2G ═ 32, P3 ═ 32} and P32 { G ═ 32}, P3632 { 32} are obtained by adding the difference C, P38 { 3932 }, P3632 } and P4{ 32}, and P11 { P11 ═ 32}, P11 ═ 2}, the compensation rule P11 ═ 2{ (P3 ═ 2 }.
It is also possible to compensate for pixels other than the reference line in the first grayscale image, for example, a row of pixels in the first grayscale image is P6{ X ═ 2, Y ═ 1, G ═ 36}, P7{ X ═ 2, Y ═ 2, G ═ 34}, P8{ X ═ 2, Y ═ 3, G ═ 32}, P9{ X ═ 2, Y ═ 4, G ═ 30}, P10{ X ═ 2, Y ═ 5, G ═ 28 }. According to the compensation rule P1{ Y ═ 1, C ═ 2}, P2{ Y ═ 2, C ═ 1}, P3{ Y ═ 3, C ═ 0}, P4{ Y ═ 4, C ═ 1}, P5{ Y ═ 5, C ═ 2}, where the compensated gray value G is obtained by adding the difference value C to the gray value G, the compensated P6 to P10 are obtained, P6{ X ═ 2, Y ═ 1, G ═ 38}, P7{ X ═ 2, Y ═ 2, G ═ 35}, P8{ X ═ 2, Y ═ 3, G ═ 32}, P9{ X ═ 2, Y ═ 4, G ═ 31, P10 ═ 2, Y ═ 5 ═ 30.. The pixel points of all the rows in the first grayscale image can be compensated according to the compensation method shown in this example, and then the second grayscale image is obtained.
S500: and obtaining the brightness uniformity of the curved surface display screen to be detected according to the gray uniformity of the second gray image.
Referring to fig. 13, fig. 13 is a sub-flowchart of the step S500 of the method for detecting the uniformity of brightness of the curved display panel according to an embodiment of the invention.
As shown in fig. 13, step S500 may include, for example:
s510: and traversing to obtain the maximum gray value and the minimum gray value of the second gray image. A scan area may be selected, which may include 2 to 16 pixels. The scanning area may step-scan the second gray scale image pixel by pixel and obtain a gray scale value of the scanning area. And comparing the gray values obtained by scanning to obtain the maximum gray value and the minimum gray value.
S520: and comparing the minimum gray value with the maximum gray value to obtain the gray uniformity of the second gray image. For example, the gray uniformity is (minimum gray value/maximum gray value) × 100%.
S530: and corresponding the gray uniformity of the second gray image to the brightness uniformity of the curved surface display screen to be detected. The brightness uniformity of the curved display screen to be measured may be equal to the gray uniformity of the second gray image.
According to the method for detecting the brightness uniformity of the curved surface display screen, the reference line is selected on the acquired first gray scale image of the curved surface display screen to be detected, the compensation rule is obtained based on the change rule of the gray scale values of all points on the reference line, the gray scale values of all points of the first gray scale image are compensated based on the compensation rule, the brightness uniformity of the curved surface display screen to be detected is obtained through the gray scale uniformity of the compensated second gray scale image, the brightness interference caused by the curved surface shape of the curved surface display screen to be detected relative to the flat surface display screen can be compensated, and the brightness uniformity of the curved surface display screen can be detected more accurately through the conventional flat surface display screen brightness uniformity detection equipment.
Referring to fig. 14, fig. 14 is a flowchart illustrating a method for detecting luminance uniformity of a curved display according to another embodiment of the invention.
In some optional embodiments, as shown in fig. 14, between step S400 and step S500, there may be further included:
s600: and performing second filtering processing on the second gray scale image to remove noise points in the second gray scale image.
Referring to fig. 15, fig. 15 is a flowchart illustrating the step S600 of the method for detecting the uniformity of brightness of the curved display according to another embodiment of the invention.
As shown in fig. 15, step S600 may specifically include, for example:
s610: the second gray scale image is divided into a plurality of regions. The plurality of regions may be uniformly divided, and each region may include the same number of pixels.
S620: and carrying out weighted average on the gray values of all the points in each area so as to remove the noise points in all the areas. For example, the gray values of the points in the region may be added and then divided by the number of the pixels in the region to obtain the gray average. And converting the gray value of the central pixel point in each region into the gray average value of the region.
Referring to fig. 16, fig. 16 is a flowchart illustrating a method for detecting luminance uniformity of a curved display panel according to another embodiment of the invention.
In some optional embodiments, as shown in fig. 16, between step S600 and step S500, further comprising:
s700: and carrying out scaling processing on the second gray-scale image.
Referring to fig. 17, fig. 17 is a flowchart illustrating a step S700 of a method for detecting brightness uniformity of a curved display panel according to another embodiment of the present invention.
As shown in fig. 17, step S700 may specifically include, for example:
s710: and carrying out interpolation average processing on each area after the noise points are removed so as to enable the gray levels of all points in each area to be the same. For example, the gray value of each pixel in each region is converted into the average gray value of the region.
S720: and taking each area as each point after zooming to obtain a second gray scale image after zooming.
After the second gray scale image is subjected to scaling processing, the maximum gray scale value and the minimum gray scale value of the second gray scale image can be more quickly obtained in a traversing mode, the calculation efficiency is improved, and the calculation amount is reduced.
In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (13)
1. A method for detecting brightness uniformity of a curved surface display screen is characterized by comprising the following steps:
acquiring a first gray image of a curved surface display screen to be tested for displaying a preset test image, wherein the first gray image has a first direction along the bending direction of the curved surface display screen to be tested;
selecting a reference line penetrating through the first gray level image at least along the first direction on the first gray level image;
obtaining a compensation rule based on the change rule of the gray value of each point on the reference line;
compensating the gray value of each point of the first gray image based on the compensation rule to obtain a second gray image;
and obtaining the brightness uniformity of the curved surface display screen to be detected according to the gray uniformity of the second gray image.
2. The method for detecting the brightness uniformity of the curved display screen according to claim 1, wherein the obtaining of the first gray image of the curved display screen to be detected displaying the preset test image comprises:
photographing the curved surface display screen to be detected to obtain a first collected image of gray scale;
acquiring the outline of the curved surface display screen to be detected in the first acquired image;
and extracting the first gray image according to the contour.
3. The method for detecting the brightness uniformity of the curved-surface display screen according to claim 2, wherein the obtaining of the profile of the curved-surface display screen to be detected in the first collected image comprises:
generating a binary image of the first captured image;
locating the contour of the first grayscale image based on the binary image.
4. The method for detecting the brightness uniformity of the curved-surface display screen according to claim 3, wherein the obtaining of the profile of the curved-surface display screen to be detected in the first collected image further comprises: performing a first filtering process on the first captured image to smooth the first captured image.
5. The method for detecting the brightness uniformity of the curved display screen according to claim 2, wherein the obtaining of the first gray image of the curved display screen to be detected displaying the preset test image further comprises: and geometrically correcting the first gray-scale image to obtain the rectangular first gray-scale image.
6. The method of claim 1, wherein the first gray scale image has a plurality of pixels arranged in rows and columns along the first direction and a second direction, the second direction intersects the first direction, each pixel has a column coordinate varying along the first direction and a row coordinate varying along the second direction,
the obtaining of the compensation rule based on the change rule of the gray value of each point on the reference line comprises the following steps:
acquiring all pixel points on the reference line, and selecting reference pixel points on the reference line;
calculating the gray difference value between the gray value of each pixel point on the reference line and the gray value of the reference pixel point and associating the gray difference value with the row coordinates of each pixel point on the reference line so as to obtain the change rule of the gray value of each pixel point on the reference line;
and taking the gray difference value corresponding to each column coordinate as a compensation value for compensating the gray value of the pixel point with the same column coordinate in the first gray image to obtain the compensation rule.
7. The method as claimed in claim 6, wherein in the step of selecting the reference pixels on the reference line,
the reference line has an edge region adjoining an edge of the first grayscale image in the first direction and a center region containing a midpoint of the reference line in the first direction,
when the curved surface display screen to be detected is a concave curved surface display screen, the reference pixel point is selected from the edge area;
and when the curved surface display screen to be detected is a convex curved surface display screen, the reference pixel point is selected from the central area.
8. The method for detecting the brightness uniformity of the curved display screen according to claim 6, wherein the compensating the gray value of each point of the first gray image based on the compensation rule comprises:
when the curved surface display screen to be detected is a concave curved surface display screen, subtracting the compensation value corresponding to the column coordinate from the gray value of the pixel point with the same column coordinate in the first gray image;
and when the curved surface display screen to be detected is a convex curved surface display screen, adding the gray value of the pixel point with the same row coordinate in the first gray image to the compensation value corresponding to the row coordinate.
9. The method for detecting the brightness uniformity of the curved-surface display screen according to claim 1, further comprising: and carrying out second filtering processing on the second gray image to remove noise points in the second gray image.
10. The method for detecting the brightness uniformity of the curved-surface display screen according to claim 9, wherein the performing of the second filtering process on the second gray-scale image comprises:
dividing the second gray scale image into a plurality of regions;
and carrying out weighted average on the gray values of all the points in each region to remove the noise points in all the regions.
11. The method for detecting the brightness uniformity of the curved-surface display screen according to claim 10, further comprising: and carrying out scaling processing on the second gray scale image.
12. The method for detecting the brightness uniformity of a curved display screen according to claim 11, wherein the scaling the second gray scale image comprises:
carrying out interpolation average processing on each region after the noise points are removed so as to enable the gray levels of all points in each region to be the same;
and taking each region as each point after zooming to obtain the second gray scale image after zooming.
13. The method for detecting the brightness uniformity of the curved-surface display screen according to claim 1, wherein the obtaining the brightness uniformity of the curved-surface display screen to be detected according to the gray uniformity of the second gray image comprises:
traversing to obtain the maximum gray value and the minimum gray value of the second gray image;
comparing the minimum gray value with the maximum gray value to obtain the gray uniformity of the second gray image;
and corresponding the gray level uniformity of the second gray level image to the brightness uniformity of the curved surface display screen to be detected.
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| CN112763502B (en) * | 2020-12-29 | 2024-03-12 | 华侨大学 | Cambered surface gloss uniformity detection method |
| CN113077759B (en) * | 2021-03-26 | 2022-04-22 | 昇显微电子(苏州)有限公司 | Curved surface screen edge compensation method and system |
| CN112947885B (en) * | 2021-05-14 | 2021-08-06 | 深圳精智达技术股份有限公司 | Method and device for generating curved surface screen flattening image |
| CN113160043B (en) * | 2021-05-21 | 2024-07-12 | 京东方科技集团股份有限公司 | Mura processing method and device for flexible display screen |
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