CN114582270A - Brightness and chrominance data acquisition method, device and system and computer readable storage medium - Google Patents
Brightness and chrominance data acquisition method, device and system and computer readable storage medium Download PDFInfo
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The embodiment of the invention discloses a method, a device and a system for acquiring brightness and chrominance data based on a brightness and chrominance data source image and a computer readable storage medium. The method for acquiring the brightness and chrominance data comprises the following steps: controlling a display screen to display a preset image; acquiring the resolution of the display screen; controlling an image acquisition device to acquire a display screen picture when the display screen displays the preset image based on human vision to obtain a brightness and chrominance data source image; determining the positions of a plurality of virtual lamp points in the display screen picture according to the brightness and chrominance data source image; and acquiring the brightness and chrominance data of the virtual lamp points from the brightness and chrominance data source image according to the positions of the virtual lamp points to serve as the brightness and chrominance data of the virtual lamp points in the display screen, wherein the brightness and chrominance data correspond to the virtual lamp points one by one. The embodiment of the invention reduces the adjustment difficulty of the image acquisition equipment and improves the correction resolution and the correction efficiency.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a brightness and chrominance data acquisition method based on a brightness and chrominance data source image, a brightness and chrominance data acquisition device based on the brightness and chrominance data source image, a brightness and chrominance data acquisition system based on the brightness and chrominance data source image and a computer-readable storage medium.
Background
With the rapid development of display screens, such as LED display screens, LED display screens have been widely used in various occasions of daily life. However, due to the characteristics of the LED display screens, such as the differences in the brightness of the LED lamp points, the brightness ratio of most of the display screens is about 1:1.2, even 1:1.3, and for these situations, it is necessary to correct the lighting chromaticity of the LED display screens one by one, so as to ensure the uniformity of the lighting chromaticity and to achieve better display effect.
Most of the currently used display screen correction technologies generate corresponding luminance and chrominance correction coefficients corresponding to LED lamp points by collecting luminance and chrominance data of each LED lamp point on an LED display screen. Because the current correction scheme needs to see a clear image imaged by each LED lamp in the display screen picture clearly, that is, a clear boundary exists between two adjacent LED lamps in the display screen picture for determining the positions of the LED lamps, the single acquisition resolution (the number of LED lamps) of the image acquisition device is limited, resulting in low correction efficiency. In addition, in the aspect of adjusting the camera, the camera is difficult to adjust clearly, the requirement on workers is high, and the correction efficiency is also reduced.
Disclosure of Invention
The embodiment of the invention provides a brightness and chrominance data acquisition method based on a brightness and chrominance data source image, a brightness and chrominance data acquisition device based on a brightness and chrominance data source image, a brightness and chrominance data acquisition system based on a brightness and chrominance data source image and a computer-readable storage medium, which reduce the adjustment difficulty of image acquisition equipment and improve the correction resolution and the correction efficiency.
On one hand, the method for acquiring the brightness and chrominance data based on the brightness and chrominance data source image provided by the embodiment of the invention comprises the following steps: controlling a display screen to display a preset image; acquiring the resolution of the display screen; controlling an image acquisition device to acquire a display screen picture when the display screen displays the preset image based on human vision to obtain a brightness and chrominance data source image; determining the positions of a plurality of virtual lamp points in the display screen picture according to the brightness and chrominance data source image; and acquiring the brightness and chrominance data of the virtual lamp points from the brightness and chrominance data source image according to the positions of the virtual lamp points to serve as the brightness and chrominance data of the virtual lamp points in the display screen, wherein the brightness and chrominance data correspond to the virtual lamp points one by one.
According to the technical scheme, the brightness and chrominance data source image is acquired based on human vision, the position of the virtual lamp point in the display screen picture is determined according to the brightness and chrominance data source image, and the brightness and chrominance data of the lamp point of the display screen are acquired according to the position of the virtual lamp point, so that the adjusting difficulty of the image acquisition equipment is reduced, the correction resolution and the correction efficiency are improved, and the correction effect of the display screen is also improved.
In one embodiment of the present invention, said determining the positions of a plurality of virtual light points within the display screen picture from the source image of luminance data and the resolution comprises: determining a plurality of vertexes of the display screen picture according to the brightness and chrominance data source image; determining a plurality of boundaries of the display screen picture according to the plurality of vertexes; determining a plurality of virtual light point distances between respective adjacent virtual light points on the plurality of boundaries according to the plurality of vertices and the resolution; determining a plurality of included angles between the plurality of boundaries and the corresponding target direction according to the plurality of vertexes; and determining the position of each virtual lamp point in the display screen picture according to the plurality of vertexes, the plurality of included angles and the plurality of virtual lamp point distances.
In one embodiment of the present invention, the determining the virtual light point distance between the respective adjacent virtual light points on the plurality of boundaries according to the plurality of vertices and the resolution comprises: determining respective boundary lengths of the plurality of boundaries from the plurality of vertices; and determining the virtual lamp point distances between two adjacent virtual lamp points on the boundaries according to the boundary lengths of the boundaries and the resolution.
In one embodiment of the invention, the target direction comprises a column direction having a row direction perpendicular to the row direction; the plurality of included angles comprise a column direction included angle between the first boundary and the column direction and a row direction included angle between the second boundary and the row direction; the plurality of vertices includes a first vertex; the plurality of boundaries includes a first boundary and a second boundary passing through the first vertex, and the plurality of virtual light point distances includes a first virtual light point distance on the first boundary and a second virtual light point distance on the second boundary; determining the position of each virtual light point in the display screen picture according to the plurality of vertexes, the plurality of included angles and the plurality of virtual light point distances comprises: determining the positions of a plurality of virtual lamp points on the first boundary according to the first vertex, the first virtual lamp point distance and the column direction included angle; determining the positions of a plurality of virtual lamp points on the second boundary according to the first vertex, the distance of the second virtual lamp point and the included angle of the row direction; and determining the positions of the virtual light points on the virtual light point rows which respectively take the virtual light points on the first boundary as starting points and are parallel to the second boundary according to the positions of the virtual light points on the first boundary, the included angle of the row direction and the distance of the second virtual light point.
In an embodiment of the present invention, the determining the positions of the plurality of virtual light points on the first boundary according to the first vertex, the first virtual light point distance, and the column direction included angle specifically includes: and with the first vertex as a starting point, moving m times of first virtual lamp point distance along the direction of offsetting the included angle of the column direction in the column direction to determine the position of a target virtual lamp point in the plurality of virtual lamp points on the first boundary, wherein m is an integer which is greater than 0 and smaller than the height direction resolution in the resolution.
In an embodiment of the present invention, the determining, by using the first vertex as a starting point, a position of a target virtual lamp point in the plurality of virtual lamp points on the first boundary by moving m times a first virtual lamp point distance in a direction offset by the included angle in the column direction along the column direction includes: obtaining a row direction distance component of the m times of first virtual lamp point distances in the row direction and a column direction distance component of the m times of first virtual lamp point distances in the column direction according to the m times of first virtual lamp point distances and the column direction included angle; adding the row direction coordinate of the first vertex and the row direction distance component to obtain the row direction coordinate of the target virtual lamp point; and adding the column direction coordinate of the first vertex and the column direction distance component to obtain the column direction coordinate of the target virtual lamp point.
In one embodiment of the present invention, the plurality of vertices include a first vertex and a second vertex, the plurality of boundaries include a first boundary determined by the first vertex and the second vertex, the target direction includes a row direction and a column direction perpendicular to the row direction, and the plurality of angles include a first row direction angle of the first boundary with the row direction or a first column direction angle of the first boundary with the column direction; the determining, according to the plurality of vertices, a plurality of included angles between the plurality of boundaries and the corresponding target directions includes: carrying out subtraction operation on the coordinate values of the first vertex and the second vertex in the row direction to obtain a row direction coordinate difference value; carrying out subtraction operation on the coordinate values in the column direction of the first vertex and the second vertex to obtain a column direction coordinate difference value; judging the absolute value of the row direction coordinate difference value and the absolute value of the column direction coordinate difference value; when the absolute value of the row direction coordinate difference is larger than or equal to the column direction coordinate difference, performing division operation on the row direction coordinate difference and the column direction coordinate difference to obtain a first coordinate ratio, and performing arc tangent operation on the first coordinate ratio to obtain a first row direction included angle between the first boundary and the row direction, wherein the target direction is the row direction; and when the absolute value of the row direction coordinate difference is smaller than the column direction coordinate difference, performing division operation on the column direction coordinate difference and the row direction coordinate difference to obtain a second coordinate ratio, and performing arc tangent operation on the second coordinate ratio to obtain a first column direction included angle between the first boundary and the column direction, wherein the target direction is the column direction. .
On the other hand, the luminance and chrominance data acquisition device based on the luminance and chrominance data source image provided by the embodiment of the invention is used for realizing the luminance and chrominance data acquisition method based on the luminance and chrominance data source image according to any one of the above items.
In another aspect, an embodiment of the present invention provides a system for acquiring luminance and chrominance data, including: the method comprises the following steps: a processor and a memory coupled to the processor; wherein the memory stores a computer program that when executed by the processor performs a method of luminance and chrominance data acquisition based on a luminance and chrominance data source image as previously described.
In yet another aspect, an embodiment of the present invention provides a computer-readable storage medium, which is a non-volatile memory and stores computer-executable instructions for performing the method for obtaining luminance and chrominance data based on a luminance and chrominance data source image as described above.
One of the above technical solutions has the following advantages or beneficial effects: according to the embodiment of the invention, the brightness and chrominance data source image is acquired based on human vision, the position of the virtual lamp point in the display screen picture is determined according to the brightness and chrominance data source image, and the brightness and chrominance data of the lamp point of the display screen is acquired according to the position of the virtual lamp point, so that the adjustment difficulty of the image acquisition equipment is reduced, the correction resolution and the correction efficiency are improved, and the correction effect of the display screen is also improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for acquiring luminance and chrominance data based on a luminance and chrominance data source image according to a first embodiment of the present invention.
Fig. 2 is a detailed flowchart of step 15 in fig. 1.
Fig. 3a is a detailed flowchart of step 153 in fig. 2.
FIG. 3b is a detailed flowchart of step 155 in FIG. 2.
Fig. 4 is a detailed flowchart of step 157 in fig. 2.
Fig. 5 is a schematic structural diagram of a display screen calibration system according to a first embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating an effect of a correction image acquired by an image acquisition device in the prior art.
Fig. 7 is a schematic diagram illustrating an effect of a luminance and chrominance data source image acquired by the image acquisition device according to the embodiment of the present invention.
Fig. 8 is a schematic diagram illustrating an effect of a display screen picture in a luminance and chrominance data source image acquired by an image acquisition device according to an embodiment of the present invention.
Fig. 9 is a parameter diagram for determining the position of a virtual light point in a luminance and chrominance data source image.
Fig. 10 is a schematic diagram illustrating the effect of determining the position of a virtual light point in a luminance and chrominance data source image.
Fig. 11 is a schematic block diagram of a luminance and chrominance data acquisition apparatus based on a luminance and chrominance data source image according to a second embodiment of the present invention.
Fig. 12 is a block diagram of the virtual light point position determining module in fig. 11.
Fig. 13 is a unit schematic diagram of the virtual lamp point distance determination unit in fig. 12.
Fig. 14 is a unit schematic diagram of the virtual light point position determination unit in fig. 12.
Fig. 15 is a schematic structural diagram of a luminance and chrominance data acquisition system based on a luminance and chrominance data source image according to a third embodiment of the present invention.
Fig. 16 is a schematic structural diagram of a computer-readable storage medium according to a fourth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
[ first embodiment ] A method for manufacturing a semiconductor device
As shown in fig. 1, a first embodiment of the present invention provides a method for acquiring luminance and chrominance data based on a luminance and chrominance data source image. The method for acquiring the brightness and chrominance data based on the brightness and chrominance data source image comprises the following steps:
s11: controlling a display screen to display a preset image;
s12: acquiring the resolution of the display screen;
s13: controlling an image acquisition device to acquire a display screen picture when the display screen displays the preset image based on human vision to obtain a brightness and chrominance data source image;
s15: determining the positions of a plurality of virtual lamp points in the display screen picture according to the brightness and chrominance data source image;
s17: and acquiring the brightness and chrominance data of the virtual lamp points from the brightness and chrominance data source image according to the positions of the virtual lamp points to serve as the brightness and chrominance data of the virtual lamp points corresponding to the virtual lamp points in the display screen.
Therefore, the embodiment of the invention acquires the brightness and chrominance data source image based on human vision, determines the position of the virtual lamp point in the display screen picture according to the brightness and chrominance data source image and acquires the brightness and chrominance data of the lamp point of the display screen according to the position of the virtual lamp point, thereby reducing the adjustment difficulty of the image acquisition equipment, improving the correction resolution and the correction efficiency and also improving the correction effect of the display screen.
Specifically, as shown in fig. 2, step S15 includes, for example:
s151: determining a plurality of vertexes of the display screen picture according to the brightness and chrominance data source image;
s152: determining a plurality of boundaries of the display screen picture according to the plurality of vertexes;
s153: determining a plurality of virtual light point distances between respective adjacent virtual light points on the plurality of boundaries according to the plurality of vertices and the resolution;
s155: determining a plurality of included angles between the plurality of boundaries and the corresponding target direction according to the plurality of vertexes; and
s157: and determining the position of each virtual lamp point in the display screen picture according to the plurality of vertexes, the plurality of included angles and the plurality of virtual lamp point distances.
Further, as shown in fig. 3a, step S153 includes, for example:
s1531: determining respective boundary lengths of the plurality of boundaries from the plurality of vertices; and
s1533: and determining the virtual lamp point distances between two adjacent virtual lamp points on the boundaries according to the boundary lengths and the resolution of the boundaries.
Furthermore, the plurality of vertices include a first vertex and a second vertex, the plurality of boundaries include a first boundary determined by the first vertex and the second vertex, the target direction includes a row direction and a column direction perpendicular to the row direction, and the plurality of included angles include a first boundary with a first row direction included angle of the row direction or a first boundary with a first column direction included angle of the column direction. As shown in fig. 3b, step S155 includes, for example:
s1551: carrying out subtraction operation on the coordinate values of the first vertex and the second vertex in the row direction to obtain a row direction coordinate difference value;
s1553: carrying out subtraction operation on the coordinate values in the column direction of the first vertex and the second vertex to obtain a column direction coordinate difference value;
s1555: judging the absolute value of the row direction coordinate difference value and the absolute value of the column direction coordinate difference value;
s1557: when the absolute value of the row direction coordinate difference is larger than or equal to the column direction coordinate difference, performing division operation on the row direction coordinate difference and the column direction coordinate difference to obtain a first coordinate ratio, and performing arc tangent operation on the first coordinate ratio to obtain a first row direction included angle between the first boundary and the row direction, wherein the target direction is the row direction;
s1559: and when the absolute value of the row direction coordinate difference is smaller than the column direction coordinate difference, performing division operation on the column direction coordinate difference and the row direction coordinate difference to obtain a second coordinate ratio, and performing arc tangent operation on the second coordinate ratio to obtain a first column direction included angle between the first boundary and the column direction, wherein the target direction is the column direction.
Furthermore, the row direction is perpendicular to the column direction. The plurality of included angles comprise a column direction included angle between the first boundary and the column direction and a row direction included angle between the second boundary and the row direction; the plurality of vertices includes a first vertex; the plurality of boundaries includes a first boundary and a second boundary that pass through the first vertex, and the plurality of virtual light point distances includes a first virtual light point distance on the first boundary and a second virtual light point distance on the second boundary. Further, as shown in fig. 4, step S157 includes, for example:
s1571: determining the positions of a plurality of virtual lamp points on the first boundary according to the first vertex, the first virtual lamp point distance and the column direction included angle;
s1573: and determining the positions of the plurality of virtual lamp points on the second boundary according to the first vertex, the distance of the second virtual lamp point and the included angle of the row direction.
In order to facilitate understanding of the present invention, the data processing method of the present embodiment will be described in detail below with reference to fig. 5 to 10.
The method for acquiring the brightness and chrominance data based on the brightness and chrominance data source image is suitable for equipment and occasions needing to use the brightness and chrominance data of the image, such as a display screen correction system and the like. Typically, as shown in fig. 5, the display screen correction system 10 includes, for example: the image capturing device 100, the correcting device 200, the display controller 300 and the display screen 400 may further include an upper computer (not shown) such as a PC connected to the display controller 300 for providing the display controller 300 with a preset image to be displayed. Of course, the preset image may also be pre-stored on the display controller 300, and the invention is not limited thereto. The image capture apparatus 100 corresponds to the display screen 400 to capture an image of a display screen when the display screen 400 displays a preset image. The calibration device 200 is connected to the image capturing device 100, and may be connected to the image capturing device 100 in a wired or wireless manner, for example, a plurality of manners such as a video cable manner, a wired network cable manner, or a wireless network manner, and is not limited in particular. The display controller 300 may be connected to the correction apparatus 200 through, for example, a wired network, a wireless network, or the like, without being particularly limited herein; in addition, the display controller 300, for example, a transmitting device having a transmitting card function, may be connected to the display screen 400 to transmit a preset image for display, and issue a correction coefficient calculated and transmitted by the correction device for correcting the brightness and/or brightness of the display screen 400. The correction data here may for example comprise luminance correction coefficients and/or luminance correction coefficients, which may for example be the same as in the prior art, for example the luminance correction coefficients per pixel may comprise 9 correction coefficient components, etc. The display controller 300 may include, for example, a programmable logic device and a microcontroller connected to the programmable logic device, and is mainly used for performing image processing on a preset image to be displayed, and packaging the preset image into a corresponding data format, for example, network data, and transmitting the network data to the display screen 400 through an ethernet interface.
The display screen 400 is used for displaying a preset image for the image capturing apparatus 100 to capture. The preset image can be selected from a red pure color frame (255,0,0), a green pure color frame (0,255,0), and a blue pure color frame (0, 255), for example; of course, the preset image may also be selected from other images, such as a white image, and the invention is not limited thereto. Typically, the display screen 400 includes, for example, at least one display module and a display control card carrying the at least one display module. The display module comprises at least one LED lamp panel. The display control card comprises a programmable logic device and a microcontroller connected with the programmable logic device, and is mainly used for decoding and processing input image data, and converting the input image data into display data and control signals for display of the display module.
The image capture device 100 may be, for example, a digital camera, an industrial camera, or other device that can capture an image of a display screen frame when the display screen 400 displays a preset image. The lens of the image capturing apparatus 100 is disposed to face the display surface of the display module 430 of the display screen 400 so that the image capturing apparatus 100 can capture a corrected image including a screen image of the display screen. That is, when the correction apparatus 200 controls the display screen 400 to display the preset image, the correction apparatus 200 controls the image capture apparatus 100 to capture a screen frame of the display screen 400 when the preset image is displayed, so as to obtain the corrected image. Specifically, when the display screen 400 displays a red pure color picture, the image capturing apparatus 100 captures at least one red correction image; when the display screen 400 displays a green solid color picture, the image capturing device 100 captures at least one green correction image; when the display screen 400 displays a blue solid color picture, the image capturing apparatus 100 captures at least one blue correction image.
The correction device 200 is, for example, a host computer such as a PC, a mobile terminal device such as a smartphone, a Pad, or the like. The correction device 200 may be, for example, installed with correction software for acquiring the correction image acquired by the image acquisition device 100, analyzing the acquired correction image, acquiring luminance and chrominance data, calculating luminance and chrominance data to obtain a correction coefficient, and uploading the correction coefficient to the display screen 400 through the display controller 300 to correct the display screen 400.
The display controller 300 may be, for example, an upper computer such as a PC or a cloud server, and is mainly used for performing image analysis, data acquisition, data operation, and the like on the correction image acquired from the correction device 200, so as to finally obtain the correction coefficient. The calibration device 200 only needs to run calibration software to receive and analyze the calibration image, and finally obtains the calculated calibration luminance and chrominance data.
In the prior art, the approximate procedure of display screen correction is as follows: the display screen 400 displays a preset image, the image acquisition device 100 acquires an image display screen picture to obtain a corrected image, the correction device 200 acquires LED lamp lighting chromaticity data according to the corrected image, and calculates a correction coefficient, and the correction device 200 uploads the correction coefficient to the display screen 400 through the display controller 300 to correct the display screen 400. Before the image acquisition device 100 acquires the corrected image, parameter adjustment needs to be performed on the image acquisition device 100, such as a camera, so that each LED light point can be clearly seen through human vision to form a clear image, that is, the boundary between each LED light point in the image is clear, and the position is clear (see fig. 6). Therefore, the method for acquiring the brightness and chrominance data based on the brightness and chrominance data source image acquires the brightness and chrominance data source image based on human vision, determines the position of the virtual lamp point in the display screen according to the brightness and chrominance data source image, and acquires the brightness and chrominance data of the lamp point of the display screen according to the position of the virtual lamp point, so that the camera adjustment difficulty is reduced, the correction resolution is improved, and the correction effect of the display screen is also improved. It should be noted that the method for acquiring luminance and chrominance data based on a luminance and chrominance data source image provided by the present invention can be specifically applied to the correction software installed on the correction device 200, and the specific implementation process is as follows.
First, a worker performs parameter adjustment on the image capturing apparatus 100 such as a camera. The parameters here may for example include exposure time, focal length, etc. It is worth mentioning that the worker does not need to adjust the camera to a state that human eyes can clearly see the clear image formed by each lamp point on the display screen, but adjusts the camera to a fuzzy state image, that is, the image collected by the camera is a brightness and chrominance data source image, the clear image of the lamp point on the display screen cannot be seen from the brightness and chrominance data source image, or the brightness and chrominance data source image is amplified to any multiple, and no clear boundary exists between any two adjacent lamp points (or bright points) of the brightness and chrominance data source image, as shown in fig. 7.
After that, the correction apparatus 200 controls the display screen 400 to display a preset image through the display controller 300.
Next, the correction device 200 controls the image capture device 100 to capture a display screen picture when the display screen 400 displays a preset image to obtain a luminance and chrominance data source image, see fig. 8.
Then, the correction device 200 determines the positions of a plurality of virtual light points within the display screen from the luminance and chrominance data source image. The spot locating method according to the prior art does not facilitate the determination of the location of the lamp spot, since there are no clear lamp spot boundaries in the luminance data source image. The virtual light point here is, for example, a virtual light point in the brightness and chrominance data source image, which is located in the display screen picture and corresponds to an actual light point in the display screen. It should be noted here that the virtual light points are not actual light points in the true sense, and are assumed to be "light points" for obtaining luminance and chrominance data of corresponding positions in the display screen, and the virtual light points in the display screen correspond to the light points on the display screen one by one. Specifically, the correction apparatus 200 acquires the luminance and chrominance data source image and acquires a plurality of vertexes of a display screen picture in the luminance and chrominance data source image, such as vertexes A, B, C and D, through an image processing method, see fig. 9. The positioning of the vertices here can be positioned using image processing techniques well established in the art, thereby positioning the area ABCD comprising the display screen. Then, the correction device 200 determines a plurality of boundaries of the display screen picture, such as boundaries AB, AD, BC, and CD, from the vertices A, B, C and D. And then, determining the virtual lamp point distance between the adjacent virtual lamp points on the plurality of boundaries according to the plurality of vertexes and the resolution of the display screen. Specifically, the correction device 200 determines the boundary lengths of a plurality of boundaries of the display screen ABCD from the vertices A, B, C and D, for example, the lengths of the boundaries AB and CD may be determined as LW, and the lengths of the boundaries AC and BD may be determined as LH, based on the coordinates of the four vertices; thereafter, the correction device 200 determines the virtual light point distance between two adjacent virtual light points on the plurality of boundaries according to the boundary length and the resolution of each of the plurality of boundaries. For example, assuming that the resolution of the display screen is 256 × 192, the first virtual light point distance D1 on the boundary AC is LW/192; the second virtual light point distance D2 on boundary AB (or CD) is LW/256. Here, D1 and D2 can also be expressed as the number of pixels between adjacent virtual light points in the display screen. It should be noted that when the area ABCD of the display screen is a parallelogram, only the virtual light point distance between two adjacent boundaries needs to be calculated, and when the area ABCD of the display screen is a trapezoid, the virtual light point distance on each boundary needs to be calculated, and the calculation method is the same as the method. Then, the calibration device 200 determines a plurality of angles between a plurality of boundaries of the display screen and the corresponding target directions according to the vertices A, B, C and D. Wherein the plurality of vertices include a first vertex and a second vertex, such as vertex a and vertex C, the plurality of boundaries include a first boundary AC determined by the first vertex and the second vertex, the target direction includes a row direction and a column direction perpendicular to the row direction, and the plurality of angles include a first row direction angle of the first boundary with the row direction or a first column direction angle of the first boundary with the column direction. Specifically, the correction device 200 performs, for example, subtraction on the coordinate values in the row direction of the first vertex and the second vertex to obtain a row direction coordinate difference value; carrying out subtraction operation on the coordinate values in the column direction of the first vertex and the second vertex to obtain a column direction coordinate difference value; judging the absolute value of the difference value of the coordinates in the row direction and the absolute value of the difference value of the coordinates in the column direction; when the absolute value of the row direction coordinate difference is larger than or equal to the column direction coordinate difference, performing division operation on the row direction coordinate difference and the column direction coordinate difference to obtain a first coordinate ratio, and performing arc tangent operation on the first coordinate ratio to obtain a first row direction included angle between the first boundary and the row direction, wherein the target direction is the row direction; and when the absolute value of the row direction coordinate difference is smaller than the column direction coordinate difference, performing division operation on the column direction coordinate difference and the row direction coordinate difference to obtain a second coordinate ratio, and performing arc tangent operation on the second coordinate ratio to obtain a first column direction included angle between the first boundary and the column direction, wherein the target direction is the column direction. In this way, the angle a between the boundary AB and the row direction in the row direction and the angle b between the boundary AC and the column direction can be obtained according to the coordinates of the two vertices, see fig. 9; of course, if the display screen ABCD is a trapezoid, the angle between the other two boundaries, such as the boundary BD and the boundary CD, needs to be calculated. Thereafter, the correction apparatus 200 determines the position of each virtual light point in the screen of the display screen according to the plurality of vertexes (A, B, C and D), the plurality of angles (a and b), and the plurality of virtual light point distances (D1 and D2). The plurality of included angles comprise a column direction included angle between the first boundary and the column direction and a row direction included angle between the second boundary and the row direction; the plurality of vertices includes a first vertex; the plurality of boundaries includes a first boundary and a second boundary that pass through the first vertex, and the plurality of virtual light point distances includes a first virtual light point distance on the first boundary and a second virtual light point distance on the second boundary. Specifically, the calibration device 200 determines the positions of a plurality of virtual light points on the first boundary according to the first vertex, the first virtual light point distance, and the column direction included angle; determining the positions of a plurality of virtual lamp points on the second boundary according to the first vertex, the distance of the second virtual lamp point and the included angle of the row direction; and determining the positions of the virtual light points on the virtual light point rows which respectively take the virtual light points on the first boundary as starting points and are parallel to the second boundary according to the positions of the virtual light points on the first boundary, the included angle of the row direction and the distance of the second virtual light point. For example, the correction apparatus 200 determines the positions of the plurality of virtual lamp points on the first boundary AC according to a first vertex a of the plurality of vertices, a first virtual lamp point distance D1, and a column direction angle b between the first boundary AC and the column direction, and more specifically, determines the position of a target virtual lamp point of the plurality of virtual lamp points on the first boundary by moving m times the first virtual lamp point distance in a direction offset by the column direction angle from the first vertex, where m is an integer greater than 0 and less than the height direction resolution of the resolution. The height direction resolution is, for example, 192, and m is smaller than 192. The correction equipment 200 obtains a row direction distance component of the m times of first virtual lamp point distances in the row direction and a column direction distance component of the m times of first virtual lamp point distances in the column direction according to the m times of first virtual lamp point distances and the column direction included angles; adding the row direction coordinate of the first vertex and the row direction distance component to obtain the row direction coordinate of the target virtual lamp point; and adding the column direction coordinate of the first vertex and the column direction distance component to obtain the column direction coordinate of the target virtual lamp point. For example, if the first vertex a is used as the starting point and a virtual light point adjacent to the first vertex a on the boundary AC is the point E, then the position of a virtual light point E on the first boundary AC is determined by moving twice the first virtual light point distance D1 along the direction offset from the column direction by the column direction included angle b with the point a as the starting point. Specifically, the correction device 200 obtains a row direction distance component and a column direction distance component in the column direction of the one-time first virtual lamp point distance according to the one-time first virtual lamp point distance D1 and the column direction included angle b, then adds the row direction coordinate and the row direction distance component of the first vertex a to obtain a row direction coordinate of the virtual lamp point E, and then adds the column direction coordinate and the column direction distance component of the first vertex a to obtain a column direction coordinate of the virtual lamp point E, that is, the position of the virtual lamp point E. The positions of the other virtual light points on the boundary AC can be determined in the same way, except that the distance traveled (m times the first virtual light point distance D1) is different for different virtual light points. Similarly, the positions of the virtual light points on the second boundary AB are determined according to the first vertex a, the second virtual light point distance D2, and the line direction included angle a, which is the same as the method for determining the positions of the virtual light points on the first boundary AC, and only the offset direction angle is different, and therefore is not described herein again. Finally, the positions of the virtual light points in the virtual light point rows are determined by sequentially moving the virtual light points on the first boundary AC by a distance n times the second virtual light point distance D2 in the direction of shifting the row direction by the row direction included angle a, where n is an integer greater than 0 and smaller than the width direction resolution in the resolution, for example, the width direction resolution of the resolution is 256, and then n is smaller than 256. The virtual lamp rows are parallel to the second boundary AB. . In this way, the positions of all virtual light points in the display screen image in the luminance and chrominance data source image are obtained, for example, referring to fig. 10, the position of the intersection point of the dotted lines in the display screen image is the position of the plurality of virtual light points. For example, the vertex a is taken as a starting point, the second virtual light point distance D2 is moved in the direction of the offset row direction included angle a to obtain the position of the second virtual light point on the first row, then the second virtual light point distance D2 is continuously moved in the same direction with the second virtual light point on the first row as the starting point to obtain the position of the third virtual light point on the first row by calculation, and so on to obtain the position information of each virtual light point on the first row; then, the vertex a is used as a starting point, and the first virtual light point distance D1 is moved along the direction of the offset column direction included angle a, so as to obtain the position of the second virtual light point on the first column. And taking the second virtual lamp point on the first column as a starting point, moving the second virtual lamp point distance D2 in the direction of offsetting the line direction included angle a to obtain the position of the second virtual lamp point on the second line, then taking the second virtual lamp point on the second line as a starting point, continuing moving the second virtual lamp point distance D2 in the same direction, calculating to obtain the position of the third virtual lamp point on the second line, and so on to obtain the position information of each virtual lamp point on the second line, and so on to obtain the positions of all the virtual lamp points in the picture of the display screen.
Then, the calibration device 200 obtains the luminance and chrominance data from the luminance and chrominance data source image according to the position of the virtual lamp point in the display screen picture, and the luminance and chrominance data is used as the luminance and chrominance data of a plurality of lamp points corresponding to the virtual lamp points on the display screen 400.
Further, the correction apparatus 200 calculates a luminance-chrominance correction coefficient of the display screen 400 from the acquired luminance-chrominance data of the plurality of lamp points of the display screen, and uploads the luminance-chrominance correction coefficient to the display screen 400 through the display controller 300 to correct the display screen 400.
In summary, the method for acquiring luminance and chrominance data based on the luminance and chrominance data source image, provided by the invention, acquires the luminance and chrominance data source image based on human vision, determines the position of the virtual lamp point in the display screen according to the luminance and chrominance data source image, and acquires the luminance and chrominance data of the lamp point of the display screen according to the position of the virtual lamp point, so as to correct the display screen. Therefore, the adjusting difficulty of the image acquisition equipment is reduced, the correction resolution is improved, and the correction effect of the display screen is also improved.
[ second embodiment ] A
As shown in fig. 11, a second embodiment of the present invention provides a luminance and chrominance data acquiring apparatus 500 based on a luminance and chrominance data source image. The brightness and chrominance data acquisition device 500 includes, for example: the system comprises a preset image display module 510, a display screen resolution acquisition module 520, a data source image acquisition module 530, a virtual light point position determination module 550 and a light point data acquisition module 570.
And a preset image display module 510, configured to control the display screen to display a preset image.
A display screen resolution obtaining module 520, configured to obtain a resolution of the display screen. The resolution (width direction resolution × height direction resolution) of the display screen is, for example, 256 × 192.
And a brightness and chrominance data source image acquisition module 530, configured to control an image acquisition device to acquire a display screen image when the display screen displays the preset image based on human vision to obtain a brightness and chrominance data source image.
And a virtual light point position determining module 550, configured to determine positions of a plurality of virtual light points in the display screen according to the luminance and chrominance data source image and the resolution.
The lamp point data obtaining module 570 is configured to obtain the luminance and chrominance data of the plurality of virtual lamp points from the luminance and chrominance data source image according to the positions of the plurality of virtual lamp points, so as to serve as the luminance and chrominance data of the plurality of lamp points, which correspond to the plurality of virtual lamp points in the display screen one to one.
Further, as shown in fig. 12, the virtual light point position determining module 550 further includes, for example:
a display screen vertex determining unit 551, configured to determine a plurality of vertices of the display screen according to the source image of the luminance and chrominance data;
a boundary determining unit 552 configured to determine a plurality of boundaries of the display screen according to the plurality of vertices;
a virtual light point distance determining unit 553 for determining a plurality of virtual light point distances between respective adjacent virtual light points on the plurality of boundaries according to the plurality of vertexes and the resolution;
a boundary included angle determining unit 555, configured to determine, according to the plurality of vertices, a plurality of included angles between the plurality of boundaries and the corresponding target directions; and
a virtual light point position determining unit 557, configured to determine, according to the multiple vertexes, the multiple included angles, and the multiple virtual light point distances, positions of virtual light points in the display screen image.
Further, as shown in fig. 13, the virtual light point distance determination unit 553 further includes, for example:
a boundary length determination subunit 5531, configured to determine boundary lengths of the respective boundaries according to the vertices; and
the virtual lamp point distance determining subunit 5533 is configured to determine the plurality of virtual lamp point distances between two adjacent virtual lamp points on the plurality of boundaries according to the boundary lengths of the plurality of boundaries and the resolution.
Wherein the target direction comprises a row direction and a column direction perpendicular to the row direction.
Further, as shown in fig. 14, the virtual light point position determination unit 557 further includes, for example:
a first boundary virtual lamp point position determining subunit 5571, configured to determine positions of a plurality of virtual lamp points on the first boundary according to the first vertex, the first virtual lamp point distance, and the column direction included angle;
a second boundary virtual lamp point position determining subunit 5573, configured to determine positions of a plurality of virtual lamp points on the second boundary according to the first vertex, the second virtual lamp point distance, and the row direction included angle;
a virtual lamp point row lamp point position determining subunit 5575, configured to determine, according to the positions of the virtual lamp points on the first boundary, the row direction included angle, and the second virtual lamp point distance, the positions of the virtual lamp points on the virtual lamp point rows that respectively use the virtual lamp points on the first boundary as starting points and are parallel to the second boundary.
The first boundary virtual lamp point position determining subunit 5571 is specifically configured to: and with the first vertex as a starting point, moving m times of first virtual lamp point distance along the direction of offsetting the included angle of the column direction in the column direction to determine the position of a target virtual lamp point in the plurality of virtual lamp points on the first boundary, wherein m is an integer which is greater than 0 and less than or equal to the height direction resolution in the resolution.
More specifically, the first boundary virtual light point position determining subunit 5571 is configured to: obtaining a row direction distance component of the m times of first virtual lamp point distances in the row direction and a column direction distance component of the m times of first virtual lamp point distances in the column direction according to the m times of first virtual lamp point distances and the column direction included angles, and adding the row direction coordinates of the first vertex and the row direction distance components to obtain row direction coordinates of the target virtual lamp point; and adding the column direction coordinate of the first vertex and the column direction distance component to obtain the column direction coordinate of the target virtual lamp point.
The modules of the luminance and chrominance data acquisition apparatus 500 based on the luminance and chrominance data source image in the present embodiment can be integrated into the correction device 200 in the foregoing embodiment, for example, and the specific working process and technical effect between the modules are referred to the description of the foregoing first embodiment.
[ third embodiment ]
As shown in fig. 15, a third embodiment of the present invention provides a luminance and chrominance data acquisition system 700 based on a luminance and chrominance data source image. Luminance and chrominance data source image-based luminance and chrominance data acquisition system 700, for example, includes a processor 730 and a memory 710 coupled to processor 730. The memory 710 may be, for example, a non-volatile memory having stored thereon a computer program 711. The processor 730 may be, for example, a central processing unit or the like. The processor 730 executes the computer program 711 and executes the method for acquiring luminance and chrominance data based on the luminance and chrominance data source image provided by the first embodiment.
For the specific working process and technical effects of the luminance and chrominance data obtaining system 700 based on the luminance and chrominance data source image in this embodiment, reference is made to the description of the foregoing first embodiment, and details are not repeated here.
[ fourth example ] A
As shown in FIG. 16, a fourth embodiment of the invention provides a computer-readable storage medium 800 having stored thereon computer-executable instructions 810. The computer-executable instructions 810 are for performing a media display method as described in the first embodiment above. The computer-readable storage medium 800 is, for example, a non-volatile memory, such as including: magnetic media (e.g., hard disks, floppy disks, and magnetic tape), optical media (e.g., CDROM disks and DVDs), magneto-optical media (e.g., optical disks), and hardware devices specially constructed for storing and executing computer-executable instructions (e.g., Read Only Memories (ROMs), Random Access Memories (RAMs), flash memories, etc.). The computer-readable storage medium 800 may execute the computer-executable instructions 810 by one or more processors or processing devices to implement a method of luma data acquisition based on a luma data source image as provided by the first embodiment described previously.
In addition, it should be understood that the foregoing embodiments are merely exemplary illustrations of the present invention, and the technical solutions of the embodiments can be arbitrarily combined and collocated without conflict between technical features and structural contradictions, which do not violate the purpose of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for acquiring brightness and chrominance data based on a brightness and chrominance data source image is characterized by comprising the following steps:
controlling a display screen to display a preset image;
acquiring the resolution of the display screen;
controlling an image acquisition device to acquire a display screen picture when the display screen displays the preset image based on human vision to obtain a brightness and chrominance data source image;
determining the positions of a plurality of virtual lamp points in the display screen picture according to the brightness and chrominance data source image and the resolution;
and acquiring the brightness and chrominance data of the virtual lamp points from the brightness and chrominance data source image according to the positions of the virtual lamp points to serve as the brightness and chrominance data of the virtual lamp points in the display screen, wherein the brightness and chrominance data correspond to the virtual lamp points one by one.
2. The method of claim 1, wherein the determining the location of the plurality of virtual light points within the display screen image from the source image of luma data and the resolution comprises:
determining a plurality of vertexes of the display screen picture according to the luminance and chrominance data source image;
determining a plurality of boundaries of the display screen picture according to the plurality of vertexes;
determining a plurality of virtual light point distances between respective adjacent virtual light points on the plurality of boundaries according to the plurality of vertices and the resolution;
determining a plurality of included angles between the plurality of boundaries and the corresponding target direction according to the plurality of vertexes; and
and determining the position of each virtual lamp point in the display screen picture according to the plurality of vertexes, the plurality of included angles and the plurality of virtual lamp point distances.
3. The method of claim 2, wherein determining the virtual light point distance between respective adjacent virtual light points on the plurality of boundaries based on the plurality of vertices and the resolution comprises:
determining boundary lengths of the boundaries according to the vertexes; and
and determining the virtual lamp point distances between two adjacent virtual lamp points on the boundaries according to the boundary lengths and the resolution of the boundaries.
4. The luminance-chrominance data acquisition method according to claim 3, wherein the target direction includes a column direction in which a row direction is perpendicular to the row direction; the plurality of included angles comprise a column direction included angle between the first boundary and the column direction and a row direction included angle between the second boundary and the row direction; the plurality of vertices includes a first vertex; the plurality of boundaries includes a first boundary and a second boundary passing through the first vertex, and the plurality of virtual light point distances includes a first virtual light point distance on the first boundary and a second virtual light point distance on the second boundary; determining the position of each virtual light point in the display screen picture according to the plurality of vertexes, the plurality of included angles and the plurality of virtual light point distances comprises:
determining the positions of a plurality of virtual lamp points on the first boundary according to the first vertex, the first virtual lamp point distance and the column direction included angle;
determining the positions of a plurality of virtual lamp points on the second boundary according to the first vertex, the distance of the second virtual lamp point and the included angle of the row direction;
and determining the positions of the virtual light points on the virtual light point rows which respectively take the virtual light points on the first boundary as starting points and are parallel to the second boundary according to the positions of the virtual light points on the first boundary, the included angle of the row direction and the distance of the second virtual light point.
5. The method for acquiring luminance and chrominance data according to claim 4, wherein the determining the positions of the plurality of virtual light points on the first boundary according to the first vertex, the first virtual light point distance, and the column direction included angle specifically includes:
and with the first vertex as a starting point, moving m times of first virtual lamp point distance along the direction of offsetting the included angle of the column direction in the column direction to determine the position of a target virtual lamp point in the plurality of virtual lamp points on the first boundary, wherein m is an integer which is greater than 0 and smaller than the height direction resolution in the resolution.
6. The method for obtaining highlight data according to claim 5, wherein said determining the position of a target virtual lamp point among a plurality of virtual lamp points on said first boundary by moving m times a first virtual lamp point distance in a direction shifted from said column direction included angle in said column direction with said first vertex as a starting point comprises:
obtaining a row direction distance component of the m times of first virtual lamp point distances in the row direction and a column direction distance component of the m times of first virtual lamp point distances in the column direction according to the m times of first virtual lamp point distances and the column direction included angle;
adding the row direction coordinate of the first vertex and the row direction distance component to obtain the row direction coordinate of the target virtual lamp point; and
and adding the column direction coordinate of the first vertex and the column direction distance component to obtain the column direction coordinate of the target virtual lamp point.
7. The method of claim 2, wherein the plurality of vertices include a first vertex and a second vertex, the plurality of boundaries include a first boundary determined by the first vertex and the second vertex, the target direction includes a row direction and a column direction perpendicular to the row direction, and the plurality of angles include a first row direction angle of the first boundary with the row direction or a first column direction angle of the first boundary with the column direction; determining, according to the plurality of vertices, a plurality of angles between the plurality of boundaries and the corresponding target direction includes:
carrying out subtraction operation on the coordinate values of the first vertex and the second vertex in the row direction to obtain a row direction coordinate difference value;
carrying out subtraction operation on the coordinate values in the column direction of the first vertex and the second vertex to obtain a column direction coordinate difference value;
judging the absolute value of the difference value of the coordinates in the row direction and the absolute value of the difference value of the coordinates in the column direction;
when the absolute value of the row direction coordinate difference is larger than or equal to the column direction coordinate difference, performing division operation on the row direction coordinate difference and the column direction coordinate difference to obtain a first coordinate ratio, and performing arc tangent operation on the first coordinate ratio to obtain a first row direction included angle between the first boundary and the row direction, wherein the target direction is the row direction;
and when the absolute value of the row direction coordinate difference is smaller than the column direction coordinate difference, performing division operation on the column direction coordinate difference and the row direction coordinate difference to obtain a second coordinate ratio, and performing arc tangent operation on the second coordinate ratio to obtain a first column direction included angle between the first boundary and the column direction, wherein the target direction is the column direction.
8. A luminance and chrominance data acquisition device based on a luminance and chrominance data source image is characterized by being used for realizing the luminance and chrominance data acquisition method based on the luminance and chrominance data source image according to any one of claims 1 to 7.
9. A luminance and chrominance data acquisition system based on a luminance and chrominance data source image, comprising: a processor and a memory coupled to the processor; wherein the memory stores a computer program which when executed by the processor performs a method of luminance and chrominance data acquisition based on a luminance and chrominance data source image as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium characterized by being a non-volatile memory and having stored thereon computer-executable instructions for performing the method of any one of claims 1 to 7 for luma data source image-based luma data acquisition.
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