CN112185300A

CN112185300A - Display screen correction method and device, storage medium and processor

Info

Publication number: CN112185300A
Application number: CN202011098699.1A
Authority: CN
Inventors: 欧兴涛; 从洪春; 杨城
Original assignee: Xian Novastar Electronic Technology Co Ltd
Current assignee: Xian Novastar Electronic Technology Co Ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-01-05

Abstract

The invention discloses a method and a device for correcting a display screen, a storage medium and a processor. Wherein, the method comprises the following steps: obtaining calibration information, wherein the calibration information is determined at least by a first influence result of a vignetting phenomenon on image data of a display screen; correcting target image data of a target display screen to be corrected based on the calibration information; and correcting the target display screen based on the corrected target image data to obtain a correction result. The invention solves the technical problem of poor effect of correcting the display screen.

Description

Display screen correction method and device, storage medium and processor

Technical Field

The invention relates to the field of display screens, in particular to a method and a device for correcting a display screen, a storage medium and a processor.

Background

At present, image acquisition equipment can be used for obtaining brightness and chrominance difference information between lamp points of a display screen, the brightness and chrominance difference information is influenced by a dark corner phenomenon or a light distribution curve of the display screen, and the real brightness and chrominance difference information cannot be reflected, so the brightness and chrominance difference information needs to be corrected. The display screen is usually corrected in a data driving mode, the data of the display screen acquired by the image acquisition equipment can be fitted to obtain the real brightness and chrominance difference information of the display screen, and then the correction coefficient of the display screen is calculated through the real brightness and chrominance difference information.

However, the correction of the display screen is greatly affected by the bright and dark blocks of the display screen, the steps between the boxes and the like, and the data driving method cannot reflect the real bright and chroma difference information of the lamp points of the display screen, so that the uniformity of the corrected display screen has large difference, and a good correction effect is difficult to achieve.

Aiming at the technical problem that the effect of correcting the display screen is poor, an effective solution is not provided at present.

Disclosure of Invention

The embodiment of the invention provides a method and a device for correcting a display screen, a storage medium and a processor, which are used for at least solving the technical problem of poor effect of correcting the display screen.

According to an aspect of an embodiment of the present invention, there is provided a method of correcting a display screen. The method can comprise the following steps: obtaining calibration information, wherein the calibration information is determined at least by a first influence result of a vignetting phenomenon on image data of a display screen; correcting target image data of a target display screen to be corrected based on the calibration information; and correcting the target display screen based on the corrected target image data to obtain a correction result.

Optionally, the calibration information is specifically determined by the first influence result and a second influence result of the light distribution curve on the image data.

Optionally, modifying the target image data of the target display screen to be corrected based on the calibration information includes: correcting a first pixel point in the target image data based on first calibration information corresponding to the first influence result, wherein the first pixel point is a pixel point influenced by a dark corner phenomenon in the target image data; and correcting a second pixel point in the target image data based on second calibration information corresponding to a second influence result, wherein the second pixel point is a pixel point influenced by the light distribution curve in the target image data.

Optionally, the correcting a second pixel point in the target image data based on second calibration information corresponding to the second influence result includes: extracting a first luminous flux from the target image data after the first pixel point is corrected; and correcting the second pixel point by using the first luminous flux and the second calibration information.

Optionally, the correcting a second pixel point in the target image data based on second calibration information corresponding to the second influence result includes: extracting a second light flux from the target image data; and correcting the second pixel point information by using the second luminous flux and the second calibration information.

Optionally, the modifying, based on first calibration information corresponding to the first influence result, a first pixel point in the target image data includes: and in the target image data after the second pixel point is corrected, correcting the first pixel point based on the first calibration information.

Optionally, modifying the target image data of the target display screen to be corrected based on the calibration information includes: and under the condition that a second influence result of the light distribution curve on the image data does not exist, correcting the first pixel point in the target image data based on the first calibration information corresponding to the first influence result.

Optionally, the correcting the target display screen based on the corrected target image data to obtain a correction result, including: and correcting the target display screen based on the target image data obtained by correcting the first pixel points and the second pixel points to obtain a correction result.

Optionally, before the first calibration information corresponding to the first influence result is used to correct the first pixel point in the target image data, the method further includes: acquiring uniform bright and chrominance field data by using image acquisition equipment, wherein the image acquisition equipment is used for acquiring image data; preprocessing the uniform bright color field data; and acquiring first calibration information based on the preprocessed uniform bright color field data.

Optionally, before the second calibration information corresponding to the second influence result is used to correct the second pixel point in the target image data, the method further includes: acquiring a rotation angle and a corresponding chromaticity measurement value of a colorimeter rotating around a horizontal direction and a vertical direction by taking a central point of a lighting area as an axis, wherein the colorimeter is vertical to a display screen; determining a calculation result between the chromaticity measurement values corresponding to different rotation angles as second calibration information under the condition that the lighting area is an area corresponding to the colorimeter in the display screen; and under the condition that the lighting area is the whole area in the display screen, calculating second calibration information based on the product of the chromaticity measured values corresponding to different rotation angles and the cosine values of the rotation angles.

Optionally, obtaining calibration information includes: and under the condition that the image acquisition equipment is parallel to the target display screen, calling calibration information based on the position of a target lamp point in the target display screen, wherein the image acquisition equipment is used for acquiring image data.

Optionally, obtaining calibration information includes: under the condition that an included angle is formed between the image acquisition equipment and the target display screen, correcting the calibration information based on the included angle, wherein the image acquisition equipment is used for acquiring image data; and calling the corrected calibration information.

According to another aspect of the embodiment of the invention, a correction device of the display screen is also provided. The apparatus may include: the device comprises an acquisition unit, a display unit and a control unit, wherein the acquisition unit is used for acquiring calibration information, and the calibration information is at least determined by a first influence result of a vignetting phenomenon on package image data of a display screen; the correction unit is used for correcting the target image data of the target display screen to be corrected based on the calibration information; and the correcting unit is used for correcting the target display screen based on the corrected target image data to obtain a correction result.

According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium. The computer readable storage medium includes a stored program, wherein the program, when executed by a processor, controls an apparatus in which the computer readable storage medium is located to perform a method for correcting a display screen according to an embodiment of the present invention.

According to another aspect of the embodiments of the present invention, there is also provided a processor. The processor is used for running a program, wherein the program executes the correction method of the display screen in the embodiment of the invention when running.

In the embodiment of the invention, calibration information is obtained, wherein the calibration information is at least determined by a first influence result of a vignetting phenomenon on image data of a display screen; correcting target image data of a target display screen to be corrected based on the calibration information; and correcting the target display screen based on the corrected target image data to obtain a correction result. Because the dark corner phenomenon influences the image data of the display screen, the acquired image data cannot reflect the real brightness and chroma difference information of the display screen, the calibration information is acquired, and then in the application process, the acquired calibration information is utilized to correct the image data of the target display screen to be corrected, the purpose is to correct the target display screen based on the corrected target image data, so that the brightness of the corrected target display screen is more uniform, and the influences of the brightness and dark blocks of the target display screen, steps between boxes and the like are avoided, so that the target display screen is well corrected, the technical problem of poor correction effect of the display screen is solved, and the correction effect of the display screen is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a flow chart of a method for calibrating a display screen according to an embodiment of the invention;

fig. 2 is a schematic diagram of an LED light distribution curve calibration architecture according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart of the removal of the correction curved surface of the LED screen according to the embodiment of the invention;

FIG. 4 is a schematic diagram of a light distribution curve of an LED according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another LED light distribution curve according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a correction device of a display screen according to an embodiment of the invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, 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.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Example 1

In accordance with an embodiment of the present invention, there is provided an embodiment of a method for correcting a display screen, it should be noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that presented herein.

Fig. 1 is a flowchart of a method for correcting a display screen according to an embodiment of the present invention. As shown in fig. 1, the method for correcting the display screen may include the following steps:

step S102, obtaining calibration information, wherein the calibration information is determined at least by a first influence result of a vignetting phenomenon on image data of the display screen.

In the technical solution provided by step S102 of the present invention, the vignetting phenomenon is generated by optical parameters between the lamp points at different angles on the display screen and the image capturing device when the image capturing device captures image data, and the optical parameters may include at least one of the following: optical path, luminous flux and light intensity.

In this embodiment, because the light points of the display screens at different angles have different optical distances to the image acquisition device, different luminous fluxes and different light intensities, there is a significant vignetting phenomenon in the image data acquired by the image acquisition device, which may also be referred to as a camera vignetting. The dark corner phenomenon cannot be avoided, but can be corrected.

In this embodiment, the image capturing Device is used to capture image data of a display screen used in the process of calibrating the calibration information, and may be a Charge Coupled Device (CCD) camera or a Complementary Metal Oxide Semiconductor (CMOS) camera. The display screen may be a uniform Light-Emitting Diode (LED) panel, the calibration information may be a calibration coefficient or a compensation coefficient, the calibration information may be determined at least from a first influence result of the dark corner phenomenon on image data of the display screen, and the calibration information may be obtained in an application process of the calibration information.

And step S104, correcting the target image data of the target display screen to be corrected based on the calibration information.

In the technical solution provided by step S104 of the present invention, after the calibration information is obtained, the target image data of the target display screen to be corrected may be corrected based on the calibration information.

In this embodiment, the target display screen may be a display screen currently required to be corrected, and may be a display screen of the same type or the same batch as the display screen used for determining the calibration coefficient. In the embodiment, in the process of correcting the target display screen, the determined calibration coefficient may be called, the target image data of the target display screen is corrected by using the calibration coefficient, and the target image data of the target display screen may be multiplied by the calibration information, so as to achieve the purpose of correcting the target image data, where the target image data may be acquired by an image acquisition device, and the target image data may not reflect the real brightness difference information due to at least the influence of a dark corner phenomenon, so that the uniformity of the screen body of the target display screen has a large difference, and thus, the embodiment needs to correct the target image data, and the corrected target image data may reflect the real brightness difference information.

And S106, correcting the target display screen based on the corrected target image data to obtain a correction result.

In the technical solution provided by step S106 of the present invention, after the target image data of the target display screen to be corrected is corrected based on the calibration information, the target display screen may be corrected based on the corrected target image data, so as to obtain a correction result.

In this embodiment, the target display screen is corrected based on the corrected target image data, a correction coefficient may be calculated by using the corrected target image data, and the target display screen is corrected by using the correction coefficient, so that the luminance uniformity of the corrected target display screen is good, and the box body of the corrected target display screen can be spliced at will, for example, in a disorderly sequence.

Through the steps S102 to S106, calibration information is obtained, wherein the calibration information is determined at least by a first influence result of a dark corner phenomenon on image data of a display screen; correcting target image data of a target display screen to be corrected based on the calibration information; and correcting the target display screen based on the corrected target image data to obtain a correction result. Because the dark corner phenomenon influences the image data of the display screen, the acquired image data cannot reflect the real brightness and chroma difference information of the display screen, the calibration information is acquired, and then in the application process, the acquired calibration information is utilized to correct the image data of the target display screen to be corrected, the purpose is to correct the target display screen based on the corrected target image data, so that the brightness of the corrected target display screen is more uniform, and the influences of the brightness and dark blocks of the target display screen, steps between boxes and the like are avoided, so that the target display screen is well corrected, the technical problem of poor correction effect of the display screen is solved, and the correction effect of the display screen is improved.

The above-described method of this embodiment is further described below.

As an alternative embodiment, the calibration information is specifically determined from the first influence result and the second influence result of the light distribution curve on the image data.

In this embodiment, the light distribution curve is determined by the lamp points of different technologies and/or wavelengths on the display screen, and is the characteristic of the display screen itself. The light intensities of the lamp points of the display screens with different technologies and/or wavelengths in different directions are different, and the angles of the different positions of the display screens reaching the image acquisition equipment are also different, namely the light intensities are different, so that a light distribution curve of the display screens exists, wherein the field angle of the display screens can refer to the range of the visual angle of which the light intensity is more than 50%. The light distribution curve of this embodiment has a second influence result on the image data.

The embodiment may collectively refer to the first influence result of the vignetting phenomenon on the image data of the display screen and the second influence result of the light distribution curve on the image data as a curved surface, that is, the curved surface refers to a difference in angle between the image capturing device and the display screen, and/or a difference in process/or wave point between different LED lamps, and the calibration information may be determined by the first influence result and the second influence result.

In this embodiment, when determining the calibration information, first calibration information corresponding to the first influence result and second calibration information corresponding to the second influence result may be respectively determined, where the first calibration information may be referred to as a camera vignetting calibration coefficient or a vignetting compensation coefficient, and the second calibration information may be referred to as a display screen light distribution curve calibration coefficient or a display screen light distribution curve compensation coefficient. After the first calibration information and the second calibration information are determined, in the application process, the first calibration information and the second calibration information are obtained to correct target image data of a target display screen to be corrected, and then the target display screen is corrected based on the corrected target image data to obtain a correction result, so that the corrected target display screen is more uniform in brightness and is not affected by bright and dark blocks of the target display screen, steps between boxes and the like, and a good correction effect on the target display screen is achieved.

As an alternative implementation, in step S104, modifying the target image data of the target display screen to be corrected based on the calibration information includes: correcting a first pixel point in the target image data based on first calibration information corresponding to the first influence result, wherein the first pixel point is a pixel point influenced by a dark corner phenomenon in the target image data; and correcting a second pixel point in the target image data based on second calibration information corresponding to a second influence result, wherein the second pixel point is a pixel point influenced by the light distribution curve in the target image data.

In this embodiment, when the target image data of the target display screen to be corrected is corrected based on the calibration information, after the target image data is acquired by the image acquisition device, a first pixel point corresponding to the first influence result may be determined in the target image data, where the first pixel point is a pixel point influenced by a dark corner phenomenon in the target image data, and then the first pixel point is corrected based on the first calibration information.

Optionally, in this embodiment, after the target image data is acquired by the image acquisition device, a second pixel point corresponding to the second influence result may be determined in the target image data, where the second pixel point is a pixel point influenced by the light distribution curve in the target image, and then the second pixel point is corrected based on the second calibration information.

In this embodiment, in the target image data, the first pixel point affected by the vignetting phenomenon and the second pixel point affected by the light distribution curve may be the same pixel point, that is, the target image data may have one or more pixel points affected by the vignetting phenomenon and the light distribution curve at the same time; optionally, the first pixel point affected by the vignetting phenomenon and the second pixel point affected by the light distribution curve may also be different pixel points, the number of the first pixel points may be one or multiple, and the number of the second pixel points may be one or multiple.

As an optional implementation manner, the modifying, based on second calibration information corresponding to the second influence result, a second pixel point in the target image data includes: extracting a first luminous flux from the target image data after the first pixel point is corrected; and correcting the second pixel point by using the first luminous flux and the second calibration information.

In this embodiment, before extracting the light flux from the target image data, the first pixel point in the target image data may be corrected based on the first calibration information, which is beneficial to extracting the light flux. Optionally, because the light intensities of the lamp points of the target display screens with different technologies and wavelengths in different directions are different, and the angles at which different positions of the target display screens reach the image acquisition device are also different, so that the target light distribution curve of the target display screen has a second influence result on the target image data, the embodiment can extract the first luminous flux from the target image data after the first pixel point is corrected based on the first calibration information corresponding to the first influence result, and then correct the second pixel point by using the first luminous flux and the second calibration information, thereby achieving the purpose of correcting the target image data of the target display screen to be corrected based on the calibration information, and further based on the target image data after the first pixel point is corrected and then the second pixel point is corrected, the target display screen is corrected to obtain a correction result, so that the corrected target display screen is more uniform in brightness and is not influenced by bright and dark blocks of the target display screen, steps between boxes and the like, and a good correction effect on the target display screen is achieved.

As an optional implementation manner, the modifying, based on second calibration information corresponding to the second influence result, a second pixel point in the target image data includes: extracting a second light flux from the target image data; and correcting the second pixel point information by using the second luminous flux and the second calibration information.

Optionally, the order of correcting the first pixel point and the second pixel point in the target image data in this embodiment may be changed, and the second light flux may be extracted from the target image data, and then the second pixel point information may be corrected by using the second light flux and the second calibration information together. This embodiment revises the second pixel in the target image data and goes on after extracting luminous flux to guarantee that the luminance of the target display screen after the correction is more even, and do not receive the influence of bright and dark piece of target display screen itself, step etc. between the box, and then reach and carry out good correction effect to the target display screen.

As an optional implementation manner, modifying a first pixel point in target image data based on first calibration information corresponding to a first influence result includes: and in the target image data after the second pixel point is corrected, correcting the first pixel point based on the first calibration information.

In this embodiment, after the second pixel points in the target image data are corrected based on the second calibration information corresponding to the second influence result, the first pixel points in the target image data may be further corrected based on the acquired first calibration information in the target image data after the second pixel points are corrected, so that the target image data of the target display screen to be corrected based on the calibration information is corrected, and then the target display screen is corrected based on the target image data after the first pixel points are corrected, so as to obtain the correction result, so that the luminance of the corrected target display screen is more uniform without being influenced by the dark blocks of the target display screen itself, the steps between boxes, and the like, and a good correction effect on the target display screen is achieved.

As an optional implementation manner, modifying target image data of a target display screen to be corrected based on calibration information includes: and under the condition that a second influence result of the light distribution curve on the image data does not exist, correcting the first pixel point in the target image data based on the first calibration information corresponding to the first influence result.

In this embodiment, under the condition that only the vignetting phenomenon has a first influence result on the image data and there is no second influence result of the light distribution curve on the image data, the embodiment may correct the first pixel point in the target image data based on only the first calibration information, so as to achieve the purpose of correcting the target image data of the target display screen to be corrected based on the calibration information, and further correct the target display screen based on the target image data corrected by the first pixel point, so as to obtain a correction result, so that the luminance of the corrected target display screen is more uniform without being influenced by bright and dark blocks of the target display screen itself, steps between boxes, and the like, thereby achieving a good correction effect on the target display screen.

As an optional implementation manner, before the first pixel point in the target image data is corrected based on the first calibration information corresponding to the first influence result, the method further includes: acquiring uniform bright and chrominance field data by using image acquisition equipment, wherein the image acquisition equipment is used for acquiring image data; preprocessing the uniform bright color field data; and acquiring first calibration information based on the preprocessed uniform bright color field data.

In this embodiment, when the first calibration information is obtained, uniform bright color field data may be collected by using an image collection device, where the uniform bright color field data may be referred to as uniform field data, and may be obtained by an integrating sphere, a uniform wall surface, a white board, or the like. Optionally, in this embodiment, an integrating sphere is used to generate uniform light planes of red, green, blue, white, and the like, and then an image acquisition device is used to perform data acquisition at a light outlet of the integrating sphere to obtain the uniform luminance and chrominance field data; optionally, in this embodiment, the image acquisition device may also be used to capture a uniform white wall surface, a white board, or the like to complete data acquisition, so as to acquire the uniform bright color field data.

After the uniform bright color field data is acquired by the image acquisition device, the embodiment may perform preprocessing on the uniform bright color field data, for example, perform noise reduction processing on the uniform bright color field data, and then calculate the first calibration information based on the preprocessed uniform bright color field data.

Optionally, in this embodiment, the data of the central point of the image capturing device is used as a standard, and first calibration information (compensation coefficient) of different pixel points with respect to the data of the central point is calculated. For example, if the data of the center point is a luminance value, the luminance value is 100, and the luminance value corresponding to the position where another pixel is located is 80, the first calibration information of the position may be a quotient of the luminance value of the center point and the luminance value corresponding to the position where another pixel is located, that is, 1.25 (100/80). When the target image data of the target display screen is corrected, the target image data of the corresponding position of the target display screen can be multiplied by the first calibration information, so that the purpose of correcting the target image data is achieved.

As an optional implementation manner, before the second pixel point in the target image data is corrected based on the second calibration information corresponding to the second influence result, the method further includes: acquiring a rotation angle and a corresponding chromaticity measurement value of a colorimeter rotating around a horizontal direction and a vertical direction by taking a central point of a lighting area as an axis, wherein the colorimeter is vertical to a display screen; determining a calculation result between the chromaticity measurement values corresponding to different rotation angles as second calibration information under the condition that the lighting area is an area corresponding to the colorimeter in the display screen; and under the condition that the lighting area is the whole area in the display screen, calculating second calibration information based on the product of the chromaticity measured values corresponding to different rotation angles and the cosine values of the rotation angles.

In this embodiment, when the second calibration information is obtained, the light distribution curve of the display screen is measured, which may be to obtain the second calibration information at different angles. In this embodiment, a colorimeter (Color meter) may be positioned perpendicular to the display screen, illuminating the light points at the display screen against which the colorimeter is positioned, assuming that 4 × 4 light points at the display screen against which the colorimeter is positioned are illuminated, forming an illuminated area, all of which fall within the measurement area of the colorimeter. The colorimeter of this embodiment may rotate around the horizontal direction and the vertical direction with the center point of the lit area as the axis, record rotation angles at which the colorimeter rotates around the horizontal direction and the vertical direction and corresponding chromaticity measurement values (colorimetry measurement values), and determine the calculation results between the chromaticity measurement values corresponding to different rotation angles as the second calibration information.

For example, in the case that the lighting area is an area corresponding to a colorimeter in the display screen, for different rotation angles and corresponding chromaticity measurement values of the embodiment, assuming that the corresponding chromaticity measurement value is 100 when one rotation angle is 0 degrees and the corresponding chromaticity measurement value is 80 when another rotation angle rotated to the left in the horizontal direction is 5 degrees, the calculation result between the chromaticity measurement value 100 corresponding to 0 degrees and the chromaticity measurement value 80 corresponding to 5 degrees is determined as the second calibration information, for example, the quotient between the chromaticity measurement value 100 corresponding to 0 degrees and the chromaticity measurement value 80 corresponding to 5 degrees is determined as the second calibration information 1.25 (100/80). In practical application, the angles corresponding to different pixel positions in the target image data of the target display screen to be corrected can be obtained through the camera parameters, and the angles are multiplied by the second calibration information.

Alternatively, the embodiment may light all regions of the display screen as lit regions, rotate around the horizontal direction and the vertical direction with a point on the display screen opposite to the center of the colorimeter as an axis, record the rotation angle and the corresponding chromaticity measurement value, and calculate the second calibration information based on a product between the chromaticity measurement value corresponding to different rotation angles and a cosine value of the rotation angle.

For example, in the case that the lighting area is all areas in the display screen, for different rotation angles and corresponding chromaticity measurement values of the embodiment, assuming that when one rotation angle is 0 degree, the corresponding chromaticity measurement value is 100, and when another rotation angle rotated to the left in the horizontal direction is 5 degrees, the corresponding chromaticity measurement value is 80, a first product between the chromaticity measurement value 100 corresponding to 0 degree and a cosine value of 0 degree is obtained, and a second product between the chromaticity measurement value 80 corresponding to 5 degrees and a cosine value of 5 degrees is obtained, and a calculation result between the first product and the second product is determined as the second calibration information, for example, a quotient between the first product and the second product is determined as the second calibration information. In practical application, the angles corresponding to different pixel positions in the target image data of the target display screen to be corrected can be obtained through the camera parameters, and the angles are multiplied by the second calibration information.

As another example, the light distribution curve of the display screen of this embodiment may be directly obtained from a manufacturer, or may be directly measured, for example, to obtain light distribution curves of the display screen in the vertical direction and the horizontal direction, and obtain six sets of light distribution curves of red, green, and blue (RGB) in total in the vertical direction and the horizontal direction, respectively. The scheme for measuring the light distribution curve of the display screen can also be called a display screen light-emitting model measuring scheme.

Optionally, in this embodiment, the light distribution curve of the display screen is preprocessed, and then second calibration coefficients of different angles are calculated.

Optionally, in step S102, obtaining calibration information includes: and under the condition that the image acquisition equipment is parallel to the target display screen, calling calibration information based on the position of a target lamp point in the target display screen, wherein the image acquisition equipment is used for acquiring image data.

In this embodiment, in the process of correcting the target display screen, if it is determined that the lens of the image capturing device and the target display screen are kept horizontal, that is, the image capturing device is in the normal direction of the target display screen, the calibrated calibration information may be called or further calculated based on the position of the target light point in the target display screen. The target lamp point may be an LED lamp point.

Optionally, in step S102, obtaining calibration information includes: under the condition that an included angle is formed between the image acquisition equipment and the target display screen, correcting the calibration information based on the included angle, wherein the image acquisition equipment is used for acquiring image data; and calling the corrected calibration information.

In this embodiment, in the process of correcting the target display screen, if a certain included angle exists between the lens of the image capturing device and the target display screen, that is, the image capturing device is not parallel to the target display screen, the calibration information corresponding to the situation that the image capturing device is parallel to the target display screen may be further corrected based on the included angle between the lens of the image capturing device and the target display screen, for example, the calibration information may be further corrected by using the position and the included angle of the target light point, and then the corrected calibration information may be called.

This embodiment is after the calibration information who obtains the display screen, the image data of other display screens of the same type or same batch can directly use the above-mentioned calibration information that obtains to revise, the final correction of treating the display screen of rectifying has been realized, the homogeneity of the luminance of display screen has been promoted, make the box of the display screen after the correction splice wantonly, and do not receive the influence of bright and dark piece of display screen itself, step etc. between the box, the poor technical problem of effect of rectifying to the display screen has been solved, and then the effect of rectifying to the display screen has been promoted.

Example 2

The technical solution of the embodiment of the present invention is further described below with reference to a preferred embodiment, specifically, a display screen is an LED, an image acquisition device is a camera, first calibration information is a camera vignetting calibration coefficient, and second calibration information is an LED light distribution curve calibration coefficient.

Currently, with the development of LED display technology, LED display screens are applied to various fields due to their advantages of low cost, low power consumption, high visibility, freedom in assembly, and the like. Meanwhile, with the popularization of the application of the LED display screen, the requirement of people on the display quality of the LED display screen is higher and higher, so that the display quality of the LED display screen needs to be improved.

The uniformity of the brightness of the LED screen is an important factor for improving the quality of the display screen, and in the related technology, the brightness and the chromaticity of the LED lamp are collected through a camera, then the correction coefficient of each lamp point is generated, and the correction coefficient is corrected to the same level. However, measuring the LED panel with an area array CCD/CMOS camera requires measuring the gradient, which is mainly affected by the camera vignetting and the LED light distribution curve.

The camera vignetting is that a CCD/CMOS camera is used for collecting uniform LED panels, and due to different optical paths, different luminous fluxes and different light intensities from LED lamp points at different angles to an area array CCD, the collected images have obvious vignetting phenomena which cannot be avoided but can be corrected.

According to the LED light distribution curve, the light intensities of the LED lamps with different technologies and wavelengths in different directions are different, and the field angle of the LED means the range of the visual angle of the light intensity of more than 50%. The different angles of the LED panel reaching the area array CCD/CMOS are different, namely the light intensity is different, the phenomenon cannot be avoided, but correction can be carried out.

If the LED display screen is directly calibrated by an area array CCD/CMOS camera, this will result in different areas of the display screen having different brightness. If carry out subregion and rectify many times to same display screen, will lead to every subregion juncture to have the step, have to lead to the unable problem of splicing of box to LED box or module correction, box or module after the correction can not disorderly the order concatenation, for example, Chip On Board (COB for short) and glass substrate.

The effects of the camera vignetting and the LED light distribution curve on the image data may be collectively referred to as a curved surface. In the related art, a data driving method is usually used, assuming that the luminance and chromaticity of an LED screen are substantially on the same level, spots (mura) are randomly distributed, wherein the spots are phenomena of various traces caused under the condition that the luminance of a display is not uniform, LED display screen data collected by a CCD/CMOS camera is fitted to obtain the real luminance and chromaticity difference information, and then the correction coefficient is calculated. And the curved surface receives LED screen bright dark piece itself, step etc. influence between the box great, for example, COB screen and glass substrate are mostly all bright dark piece to above-mentioned data drive scheme hardly reaches good correction effect again.

According to the LED display screen measured by the area array CCD/CMOS camera, due to the influence of the camera dark angle and the LED light distribution curve, the area array CCD/CMOS camera collects data and cannot reflect the real brightness and chromaticity difference information of the LED lamp points, so that the uniformity of the corrected screen body has large difference, and the box body of the corrected LED screen cannot be spliced at will.

However, in this embodiment, calibration information is determined according to the influence result of the camera vignetting and the LED light distribution curve on the image data, the image data acquired by the camera is corrected by using the calibration information, and the corrected image data is used to correct the LED display screen to be corrected, so that the corrected LED display screen is more uniform, and the LED box bodies can be spliced at will. The method of this embodiment is further described below.

Fig. 2 is a schematic diagram of an LED light distribution curve calibration architecture according to an embodiment of the present invention. As shown in fig. 2, the system for implementing the LED light distribution curve calibration architecture includes: a receiver 21, a transmission Controller (Sender Controller)22, a mobile terminal 23, a colorimeter 24, and an LED display screen 25.

In this embodiment, the mobile terminal 23 may be a notebook computer (Laptop) or a Desktop computer (Desktop), and transmits control data to the receiver 21 through the transmission controller 22 to control the LED display screen 24 to operate, and the mobile terminal may further control the colorimeter to rotate in the horizontal direction and the vertical direction with the central point of the lighting area on the LED screen as an axis to determine the LED light distribution curve.

Fig. 3 is a schematic flow chart of removing a correction curved surface of an LED screen according to an embodiment of the present invention. As shown in fig. 3, in the process of determining the calibration information, in the embodiment, a camera vignetting calibration coefficient is determined according to a first influence result of the camera vignetting on the image data of the display screen, an LED light distribution curve calibration coefficient is determined according to a second influence result of the LED light distribution curve of the LED display screen on the image data of the display screen, then the image data of the LED display screen to be corrected, which is acquired by the camera, is corrected by using the camera vignetting calibration coefficient and the LED light distribution curve calibration coefficient, and further, the LED display screen to be corrected is corrected by using the corrected image data.

In this embodiment, after the image data of the LED display screen to be corrected is acquired, the camera vignetting calibration coefficient may be directly used to correct the image data of the LED display screen to be corrected acquired by the camera, or before the light flux is extracted, the camera vignetting calibration coefficient may be used to correct the image data of the LED display screen to be corrected acquired by the camera, which is beneficial to the extraction of the light flux. Similarly, the image data of the display screen to be corrected is corrected by using the calibration coefficient of the LED light distribution curve, or the sequence of the correction and the exchange of the correction and the image data of the display screen to be corrected by using the camera vignetting calibration coefficient is performed, but the correction is generally performed after the light flux is extracted, so that the image data of the display screen to be corrected can be corrected by using the extracted light flux and the calibration coefficient of the LED light distribution curve, and the LED display screen to be corrected is corrected based on the corrected image data.

In this embodiment, when the camera dark angle calibration coefficient is obtained, a camera may be used to collect uniform field data such as an integrating sphere, where the uniform field data may be referred to as uniform bright field data and may be implemented by an integrating sphere, a uniform wall surface, a white board, or the like. Alternatively, the embodiment may utilize the integrating sphere to generate a uniform light plane of red, green, blue, white, etc., and then use the camera to perform data acquisition at the light outlet of the integrating sphere; the embodiment can also use a camera to shoot uniform white wall surfaces and white boards to finish the acquisition of uniform bright chroma field data, and further determine the camera dark angle calibration coefficient based on the uniform bright chroma field data.

In the embodiment, in the calibration process, the uniform bright color field data may be preprocessed, for example, the uniform bright color field data may be subjected to noise reduction processing, and then the camera dark angle calibration coefficient of each pixel point of the camera may be calculated.

Optionally, in this embodiment, assuming that the data of the center point of the camera is used as a standard, then the camera vignetting calibration coefficient of different pixel points compared to the center point is calculated. For example, if the brightness value of the center point is 100 and the brightness value of the other position is 80, the camera dark angle calibration coefficient at the position is 1.25(100/80), and then when the corresponding position of the LED display screen to be corrected is corrected, the camera dark angle calibration coefficient value may be multiplied by the image data at the corresponding position.

In this embodiment, the LED light distribution curve can be measured during the calibration process to obtain calibration coefficients of the LED light distribution curve at different angles. The scheme for measuring the light distribution curve of the LED may also be referred to as an LED light emitting model measurement scheme.

In this embodiment, the LED light distribution curve can be obtained directly from the manufacturer or measured directly.

Alternatively, the embodiment may obtain the LED light distribution curve directly from the LED manufacturer, fig. 4 is a schematic diagram of one LED light distribution curve according to the embodiment of the present invention, and fig. 5 is a schematic diagram of another LED light distribution curve according to the embodiment of the present invention. As shown in fig. 4 and 5, wherein the red line and the blue line respectively represent the vertical LED light distribution curve and the horizontal LED light distribution curve, six sets of vertical and horizontal LED light distribution curves of RGB three colors can be obtained.

Optionally, in the process of determining the calibration information, the colorimeter may be perpendicular to the LED screen, the LED lamp points directly opposite to the colorimeter are lighted, and if the LED lamp points directly opposite to the colorimeter by 4 × 4 are lighted, all the LED lamp points fall in the measurement area of the colorimeter. And then, rotating the colorimeter according to the horizontal direction and the vertical direction by taking the central point of the lighting area as an axis, further recording the rotation angle and the corresponding chromaticity measured value, and determining the calibration coefficient of the LED light distribution curve based on the chromaticity measured values corresponding to different rotation angles.

For example, in the embodiment, assuming that the rotation angle and the corresponding chromaticity measurement value are 0 degree, the corresponding chromaticity measurement value is 100, and when the rotation angle rotated to the left in the horizontal direction is 5 degrees, the corresponding chromaticity measurement value is 80, the calibration coefficient of the LED light distribution curve is 1.25. In practical application, the angles corresponding to different pixel positions of the LED display screen to be corrected can be obtained through camera parameters, and the angles are multiplied by the calibration coefficient of the LED light distribution curve.

Optionally. In this embodiment, all the LED panels are lit, the colorimeter is rotated in the horizontal direction and the vertical direction with a point on the LED panel, which is opposite to the center of the colorimeter, as the axis, the rotation angle and the corresponding chromaticity measurement value are recorded, and the calibration coefficient of the LED light distribution curve is obtained based on the calculation result of multiplying the different chromaticity measurement values by the cosine value of the corresponding rotation angle.

In this embodiment, the LED light distribution curve may be preprocessed, and then the compensation coefficients of the LED light distribution curve at different angles may be calculated.

After the camera vignetting calibration coefficient and the LED light distribution curve calibration coefficient are obtained through calculation, the embodiment applies the camera vignetting calibration coefficient and the LED light distribution curve calibration coefficient to the whole screen or other display screens of the same type or the same batch.

The application process of the calibration information corresponds to the process of correcting the to-be-corrected LED display screen, and if the camera lens and the screen body of the to-be-corrected LED display screen are kept horizontal, that is, the camera is in the normal direction of the screen body, the camera vignetting calibration coefficient and the LED light distribution curve calibration coefficient corresponding to the position of the LED lamp of the to-be-corrected LED display screen can be obtained.

If a certain included angle exists between the camera lens and the screen body of the LED display screen to be corrected in the process of correcting the LED display screen to be corrected, the camera vignetting calibration coefficient and the LED light distribution curve compensation coefficient can be called by utilizing the included angle and the position of the LED lamp.

According to the embodiment, the camera vignetting calibration coefficient is determined according to the first influence result of the camera vignetting on the image data of the display screen, the LED light distribution curve calibration coefficient is determined according to the second influence result of the LED light distribution curve on the image data of the display screen, and other display screens of the same type or the same batch can be directly corrected by using the camera vignetting calibration coefficient and the LED light distribution curve calibration coefficient to realize the same display screens and carry out random splicing, so that the uniformity of the display screens is improved.

Example 3

The embodiment of the invention also provides a correction device of the display screen. It should be noted that the correction device of the display screen of this embodiment can be used to execute the correction method of the display screen of the embodiment of the present invention.

Fig. 6 is a schematic diagram of a correction device of a display screen according to an embodiment of the invention. As shown in fig. 6, the correction device 60 of the display screen may include: an acquisition unit 61, a correction unit 62, and a correction unit 63.

An obtaining unit 61 is configured to obtain calibration information, where the calibration information is determined at least by a first influence result of a vignetting phenomenon on packet image data of the display screen.

And a correcting unit 62 for correcting the target image data of the target display screen to be corrected based on the calibration information.

And the correcting unit 63 is used for correcting the target display screen based on the corrected target image data to obtain a correction result.

Alternatively, the correction unit 62 includes: the first correction module is used for correcting a first pixel point in the target image data based on first calibration information corresponding to the first influence result, wherein the first pixel point is a pixel point influenced by a dark corner phenomenon in the target image data; and the second correction module is used for correcting second pixel points in the target image data based on second calibration information corresponding to the second influence result, wherein the second pixel points are pixel points influenced by the light distribution curve in the target image data.

Optionally, the second modification module includes: the first extraction submodule is used for extracting first luminous flux from the target image data after the first pixel point is corrected; and the first correction submodule is used for correcting the second pixel point by using the first luminous flux and the second calibration information.

Optionally, the second modification module includes: a second extraction sub-module for extracting a second luminous flux from the target image data; and the second correction submodule is used for correcting the second pixel point information by using the second luminous flux and the second calibration information.

Optionally, the first modification module includes: and the third correction submodule is used for correcting the first pixel point based on the first calibration information in the target image data after the second pixel point is corrected.

Alternatively, the correction unit 62 includes: and the third correction module is used for correcting the first pixel point in the target image data based on the first calibration information corresponding to the first influence result under the condition that a second influence result of the light distribution curve on the image data does not exist.

Alternatively, the correction unit 63 includes: and the correction module is used for correcting the target display screen based on the target image data obtained by correcting the first pixel points and the second pixel points to obtain a correction result.

Optionally, the apparatus further comprises: the acquisition unit is used for acquiring uniform bright color field data by using image acquisition equipment before correcting a first pixel point in target image data based on first calibration information corresponding to a first influence result, wherein the image acquisition equipment is used for acquiring image data; the preprocessing unit is used for preprocessing the uniform bright color field data; and the first acquisition unit is used for acquiring first calibration information based on the preprocessed uniform bright color field data.

Optionally, the apparatus further comprises: the second obtaining unit is used for obtaining a rotation angle and a corresponding chromaticity measured value of the colorimeter rotating around the horizontal direction and the vertical direction by taking the central point of the lighting area as an axis, wherein the colorimeter is vertical to the target display screen before correcting a second pixel point in the target image data based on second calibration information corresponding to a second influence result; the determining unit is used for determining a calculation result between the chromaticity measured value and the rotation angle as second calibration information under the condition that the lighting area is an area corresponding to the colorimeter in the target display screen; and the third acquisition unit is used for acquiring a product between the chromaticity measured value and the cosine value of the rotation angle under the condition that the lighting area is the whole area in the target display screen, and calculating second calibration information based on the product.

Alternatively, the acquisition unit 61 includes: the first calling module is used for calling calibration information based on the position of a target lamp point in a target display screen under the condition that the image acquisition equipment is parallel to the target display screen, wherein the image acquisition equipment is used for acquiring image data.

Alternatively, the acquisition unit 61 includes: the fourth correction module is used for correcting the calibration information based on an included angle under the condition that the image acquisition equipment and the target display screen have the included angle, wherein the image acquisition equipment is used for acquiring image data; and the second calling module is used for calling the corrected calibration information.

Because the dark corner phenomenon influences the image data of the display screen, the acquired image data cannot reflect the real brightness and chroma difference information of the display screen, the calibration information is acquired, and then in the application process, the acquired calibration information is utilized to correct the image data of the target display screen to be corrected, the purpose is to correct the target display screen based on the corrected target image data, so that the brightness of the corrected target display screen is more uniform, and the influences of the brightness and dark blocks of the target display screen, steps between boxes and the like are avoided, so that the target display screen is well corrected, the technical problem of poor correction effect of the display screen is solved, and the correction effect of the display screen is improved.

Example 4

According to an embodiment of the present invention, there is also provided a computer-readable storage medium. The computer readable storage medium includes a stored program, wherein the program, when executed by a processor, controls an apparatus in which the computer readable storage medium is located to perform a method for correcting a display screen according to an embodiment of the present invention.

Example 5

According to the embodiment of the invention, the processor is used for running a program, wherein the program executes the correction method of the display screen of the embodiment of the invention when running.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, 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, units or models, and may be in an electrical 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 a plurality of 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, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A method for correcting a display screen, comprising:

obtaining calibration information, wherein the calibration information is determined at least by a first influence result of a vignetting phenomenon on image data of a display screen;

correcting target image data of a target display screen to be corrected based on the calibration information;

and correcting the target display screen based on the corrected target image data to obtain a correction result.

2. The method according to claim 1, wherein the calibration information is determined by the first influence result and a second influence result of a light distribution curve on the image data.

3. The method of claim 2, wherein modifying the target image data of the target display screen to be corrected based on the calibration information comprises:

correcting a first pixel point in the target image data based on first calibration information corresponding to the first influence result, wherein the first pixel point is a pixel point influenced by the vignetting phenomenon in the target image data;

and correcting a second pixel point in the target image data based on second calibration information corresponding to the second influence result, wherein the second pixel point is the pixel point influenced by the light distribution curve in the target image data.

4. The method of claim 3, wherein correcting a second pixel point in the target image data based on second calibration information corresponding to the second influence result comprises:

extracting a first luminous flux from the target image data corrected by the first pixel point;

and correcting the second pixel point by using the first luminous flux and the second calibration information.

5. The method of claim 3, wherein correcting a second pixel point in the target image data based on second calibration information corresponding to the second influence result comprises:

extracting a second light flux from the target image data;

and correcting the second pixel point information by using the second luminous flux and the second calibration information.

6. The method of claim 5, wherein correcting the first pixel point in the target image data based on the first calibration information corresponding to the first influence result comprises:

and correcting the first pixel points in the target image data after the second pixel points are corrected based on the first calibration information.

7. The method of claim 1, wherein modifying the target image data of the target display screen to be corrected based on the calibration information comprises:

and under the condition that a second influence result of the light distribution curve on the image data does not exist, correcting a first pixel point in the target image data based on first calibration information corresponding to the first influence result.

8. The method of claim 3, wherein before correcting the first pixel point in the target image data based on the first calibration information corresponding to the first influence result, the method further comprises:

acquiring uniform brightness and chrominance field data by using image acquisition equipment, wherein the image acquisition equipment is used for acquiring the image data;

preprocessing the uniform bright color field data;

and acquiring the first calibration information based on the preprocessed uniform bright color field data.

9. The method of claim 3, wherein before correcting the second pixel point in the target image data based on the second calibration information corresponding to the second influence result, the method further comprises:

acquiring a rotation angle and a corresponding chromaticity measurement value of a colorimeter rotating around a horizontal direction and a vertical direction by taking a central point of a lighting area as an axis, wherein the colorimeter is vertical to the display screen;

determining a calculation result between the chromaticity measurement values corresponding to different rotation angles as the second calibration information under the condition that the lighting area is an area corresponding to the colorimeter in the display screen;

and under the condition that the lighting area is the whole area in the display screen, calculating the second calibration information based on the product of the chromaticity measured value corresponding to different rotation angles and the cosine value of the rotation angle.

10. The method according to any one of claims 1 to 9, wherein obtaining the calibration information comprises:

and under the condition that the image acquisition equipment is parallel to the target display screen, calling the calibration information based on the position of a target lamp point in the target display screen, wherein the image acquisition equipment is used for acquiring the image data.

11. The method according to any one of claims 1 to 9, wherein obtaining the calibration information comprises:

under the condition that an included angle is formed between image acquisition equipment and the target display screen, correcting the calibration information based on the included angle, wherein the image acquisition equipment is used for acquiring the image data;

and calling the corrected calibration information.

12. A correction device for a display screen, comprising:

the device comprises an acquisition unit, a display unit and a control unit, wherein the acquisition unit is used for acquiring calibration information, and the calibration information is at least determined by a first influence result of a vignetting phenomenon on package image data of a display screen;

the correction unit is used for correcting the target image data of the target display screen to be corrected based on the calibration information;

and the correcting unit is used for correcting the target display screen based on the corrected target image data to obtain a correction result.

13. A computer-readable storage medium, comprising a stored program, wherein the program, when executed by a processor, controls an apparatus in which the computer-readable storage medium is located to perform the method of any of claims 1-11.

14. A processor, characterized in that the processor is configured to run a program, wherein the program when running performs the method of any of claims 1 to 11.