CN112543969A - Brightness and chrominance correction method, device and system, storage medium and display - Google Patents
Brightness and chrominance correction method, device and system, storage medium and display Download PDFInfo
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- CN112543969A CN112543969A CN202080003291.3A CN202080003291A CN112543969A CN 112543969 A CN112543969 A CN 112543969A CN 202080003291 A CN202080003291 A CN 202080003291A CN 112543969 A CN112543969 A CN 112543969A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
Abstract
The disclosure relates to a brightness and chrominance correction method, device and system, a storage medium and a display. The brightness and chrominance correction method comprises the following steps: acquiring a brightness and chrominance image corresponding to each backlight area on a display, wherein the brightness and chrominance image is shot under the condition that the transmittance of the display is configured to be a preset transmittance; determining a brightness characteristic value of each backlight area based on the brightness image corresponding to each backlight area; determining a target public brightness characteristic value according to the brightness characteristic values of all the backlight areas; calculating a correction parameter for adjusting the brightness characteristic value of the backlight area to the target public brightness characteristic value aiming at each backlight area; the correction parameters are used for adjusting the brightness of the corresponding backlight area, so that the brightness of each backlight area on the backlight plate of the display is uniform, and the quality of an image displayed on the display is improved.
Description
Technical Field
The present disclosure relates to the field of backlight display technologies, and in particular, to a method, an apparatus, a system, a storage medium, and a display for luminance and chrominance correction.
Background
The backlight plate of the direct type partition dynamic backlight display is generally designed to be in the form of an array in which Light Emitting Diodes (LEDs) are uniformly arranged. The backlight light source of the direct type partition dynamic backlight display can be a monochromatic LED lamp, and can also be an LED lamp consisting of red, green and blue.
No matter a monochromatic LED lamp or a tricolor LED lamp is adopted, when the direct type partition dynamic backlight display displays an image, because the brightness of each partition of the backlight plate can be respectively controlled, the high contrast ratio of a high-brightness image area and a dark image area of the display screen can be achieved, and the energy consumption of the backlight plate can be reduced. However, when there is a difference in brightness or chromaticity emitted from the LED light sources of different partitions, the chromaticity of the image displayed on the display screen through the display panel will inevitably have a non-uniform phenomenon, which results in poor image quality on the display screen.
Disclosure of Invention
The disclosure provides a method, an apparatus, a system, a storage medium and a display for luminance and chrominance correction, so that luminance and chrominance of each backlight area on a backlight plate of the display have uniformity, thereby improving the quality of a displayed image.
In order to achieve the above object, according to a first aspect of embodiments of the present disclosure, there is provided a luminance and chrominance correction method, including:
acquiring a brightness and chrominance image corresponding to each backlight area on a display, wherein the brightness and chrominance image is shot under the condition that the transmittance of the display is configured to be a preset transmittance;
determining a brightness characteristic value of each backlight area based on the brightness image corresponding to each backlight area;
determining a target public brightness characteristic value according to the brightness characteristic values of all the backlight areas;
calculating a correction parameter for adjusting the brightness characteristic value of the backlight area to the target public brightness characteristic value aiming at each backlight area;
the correction parameters are used for adjusting the brightness of the corresponding backlight area, so that the brightness of each backlight area on the backlight plate has uniformity.
Optionally, the preset transmittance includes: red preset transmittance, green preset transmittance and blue preset transmittance; the luminance and chrominance images of each backlight area include a first luminance and chrominance image, a second luminance and chrominance image, and a third luminance and chrominance image of the backlight area, and accordingly, the obtaining of the luminance and chrominance images respectively corresponding to the backlight areas on the display includes:
under the condition that the transmittance of the display is configured to be the red preset transmittance, acquiring the first bright-chrominance images corresponding to the backlight areas on the display respectively;
under the condition that the transmittance of the display is configured to be the preset green transmittance, acquiring the second bright-chrominance images corresponding to the backlight areas on the display respectively;
and under the condition that the transmittance of the display is configured to be the preset blue transmittance, acquiring the third bright-chrominance images respectively corresponding to the backlight areas on the display.
Optionally, the characteristic value of the luminance chromaticity of each backlight area is a tristimulus value.
Optionally, the luminance and chrominance characteristic values include a luminance characteristic value and a chrominance characteristic value;
the method further comprises the following steps: calculating the luminance characteristic value or the chrominance characteristic value of each luminance and chrominance image by the following formula:
Optionally, the determining a target common luminance and chrominance characteristic value according to the luminance and chrominance characteristic values of all the backlight areas includes:
obtaining a target brightness characteristic value in the target public brightness characteristic value by multiplying a preset coefficient according to the average value of the brightness characteristic values of all the backlight areas, wherein the preset coefficient is a positive number not greater than 1;
and determining a common color gamut of all the backlight areas according to the chromaticity characteristic values of all the backlight areas, wherein the common color gamut is a target chromaticity characteristic value in the target common bright chromaticity characteristic values.
Optionally, the correction parameter of each backlight area is calculated by the following formula:
wherein the content of the first and second substances,
characteristic values of the luminance and chrominance of the backlight area are represented,
the correction parameters characterizing the backlight area,
and characterizing the characteristic value of the target public brightness degree.
According to a second aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of any one of the above-mentioned first aspects.
According to a third aspect of the embodiments of the present disclosure, there is provided a luminance and chrominance correction device, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any of the first aspects above.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a display including the luminance and chrominance correction apparatus of the third aspect.
According to a fifth aspect of the embodiments of the present disclosure, there is provided a luminance and chrominance correction system, comprising a display and a luminance and chrominance correction device communicatively connected to the display;
the luminance and chrominance correction device is configured to send a luminance and chrominance correction instruction to the display after obtaining the correction parameter according to any one of the above-mentioned first aspect, where the luminance and chrominance correction instruction includes the correction parameter;
the display is used for responding to the received brightness and chrominance correction instruction sent by the brightness and chrominance correction device and correcting backlight plate parameters of the display according to the correction parameters in the brightness and chrominance correction instruction.
By adopting the technical scheme, the following technical effects can be at least achieved:
the method comprises the steps of obtaining a brightness and chrominance image respectively corresponding to each backlight area on a display, wherein the brightness and chrominance image is shot under the condition that the transmittance of the display is configured to be a preset transmittance. And determining the characteristic value of the brightness and the chrominance of each backlight area based on the brightness and chrominance image respectively corresponding to each backlight area. And determining a target public brightness characteristic value according to the brightness characteristic values of all the backlight areas. And calculating a correction parameter for adjusting the brightness characteristic value of the backlight area to the target public brightness characteristic value aiming at each backlight area. And adjusting the brightness of the corresponding backlight area according to the correction parameters of the backlight areas so that the brightness of the backlight areas on the backlight plate of the display is uniform, thereby improving the quality of the image displayed on the display.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart illustrating a luminance and chrominance correction method according to an exemplary embodiment of the present disclosure.
Fig. 2 is a schematic diagram illustrating an association relationship between a luminance and chrominance image and a field K according to an exemplary embodiment of the disclosure.
Fig. 3 is a schematic diagram of a color gamut space shown in accordance with an exemplary embodiment of the present disclosure.
Fig. 4 is a block diagram illustrating a luminance and chrominance correction apparatus according to an exemplary embodiment of the present disclosure.
Fig. 5 is a block diagram illustrating a luminance and chrominance correction system according to an exemplary embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The backlight plate of the direct type partition dynamic backlight display is generally designed to be in the form of an array in which Light Emitting Diodes (LEDs) are uniformly arranged. The backlight light source of the direct type partition dynamic backlight display can be a monochromatic LED lamp, and can also be an LED lamp consisting of red, green and blue. If the backlight plate adopts a monochromatic LED lamp, such as a blue lamp, the blue light emitted by the blue lamp excites the fluorescence to emit white light, and the white light is irradiated on the display panel. If the backlight plate adopts an LED lamp consisting of three primary colors of red, green and blue, white light is emitted by superposition of the three primary colors to irradiate on the display panel. Among them, the display panel itself does not have a light emitting property. The display panel selectively filters part of colors through the irradiation of the backlight plate and the color filter, thereby achieving the purpose of displaying images with different colors.
No matter a monochromatic LED lamp or a tricolor LED lamp is adopted, when the direct type partition dynamic backlight display displays an image, because the brightness of each partition of the backlight plate can be respectively controlled, the high contrast ratio of a high-brightness image area and a dark image area of the display screen can be achieved, and the energy consumption of the backlight plate can be reduced. However, when there is a difference in brightness or chromaticity emitted from the LED light sources of different partitions, the chromaticity of the image displayed on the display screen through the display panel will inevitably have a non-uniform phenomenon, which results in poor image quality on the display screen.
In view of the above, embodiments of the present disclosure provide a method, an apparatus, a system, a storage medium, and a display for correcting a luminance value of each backlight area on a backlight of the display to have uniformity, so as to improve the quality of an image displayed on the display.
Fig. 1 is a flowchart illustrating a luminance and chrominance correction method according to an exemplary embodiment of the present disclosure, which may include the following steps, as shown in fig. 1:
and S11, acquiring a brightness and chrominance image respectively corresponding to each backlight area on the display, wherein the brightness and chrominance image is shot under the condition that the transmittance of the display is configured to be a preset transmittance.
The display may be a liquid crystal display including a direct type backlight panel and a liquid crystal display panel (LCD). Because to straight following formula backlight display, can divide into a plurality of regions through the LED lamp battle array that evenly distributes on the board in a poor light, consequently can realize controlling respectively to the light intensity of each back light zone on the board in a poor light to reach the contrast that improves the image that shows on the display, and reduce the purpose of display energy consumption. In one embodiment, the backlight panel can be divided into a plurality of backlight regions of the same size, each backlight region including at least one led or fluorescent light source. It is understood that after the backlight panel is partitioned, each backlight area of the backlight panel corresponds to one pixel area on the display. When each frame of image of the video image is displayed on the display, each pixel area on the display correspondingly displays one image area in each frame of image.
In step S11, a luminance and chrominance image corresponding to each backlight area on the display may be acquired, where the acquired luminance and chrominance image corresponding to each backlight area is not affected by other backlight areas. In an implementation, the control is performed sequentially for each backlight area, and a bright-chrominance image of the backlight area is obtained by shooting through a bright-chrominance imaging device (such as a camera) under the condition that the transmittance of the display is configured to be a preset transmittance. In another implementation, each backlight area on the backlight plate is controlled by a dot-separation display method, so that the luminance and chrominance images corresponding to the plurality of backlight areas can be acquired at one time. The dot separation display method specifically refers to controlling the next backlight area to light after a plurality of backlight areas are separated, so that the brightness and chrominance images of a plurality of nonadjacent backlight areas on the backlight plate can be acquired at one time.
It should be noted that, based on the principle of the technical solution of the present disclosure, in an embodiment of obtaining the luminance and chrominance images respectively corresponding to each backlight area on the backlight plate of the display, before the backlight plate and the display panel are assembled into the display, the luminance and chrominance images of each backlight area on the backlight plate can be obtained separately for the backlight plate. In this way, there is no need to control the transmittance of the display panel of the display.
And S12, determining the characteristic value of the brightness degree of each backlight area based on the brightness degree image corresponding to each backlight area.
After the brightness and chrominance image of each backlight area on the backlight plate is obtained, the brightness and chrominance characteristic value of the backlight area can be calculated according to the brightness and chrominance image of each backlight area.
In a possible case, in an actual implementation process, since the photographing plane of the luminance and chrominance imaging device may not be parallel to the display panel plane of the display, or the positions of the perpendicular bisectors of the two planes may be deviated, the luminance and chrominance image photographed by the luminance and chrominance imaging device may have a distortion, and therefore, before determining the luminance and chrominance characteristic values of each backlight area based on the luminance and chrominance image respectively corresponding to each backlight area, the luminance and chrominance image of each backlight area may be subjected to image correction processing.
Specifically, a scale image is displayed on a liquid crystal display, and the scale image is photographed by a bright-chroma imaging device to obtain an image to be corrected. Then, the position information of the feature point of the image to be corrected is extracted using image processing or an image recognition algorithm. Further, the mapping conversion parameters of the liquid crystal display panel and the bright-chroma imaging device are obtained through calculation according to the known position information of the characteristic points of the image to be corrected on the scale image and the position information of the characteristic points on the image to be corrected. For example, the mapping transformation parameter may be
The brightness and chrominance images of each backlight area shot by the brightness and chrominance imaging device can be corrected by using the mapping conversion parameters. The luminance-chromaticity image of each backlight area is corrected by, for example, the following calculation formula:
and u and v are coordinates of each pixel point in the luminance and chrominance image of each backlight area shot by the luminance and chrominance imaging device, and coordinates x and y of the pixel point after correction are obtained correspondingly through the calculation formula, wherein x is x '/W', y is y '/W', and W is a constant.
By adopting the correction mode, the corrected brightness and chrominance images of the backlight areas are more matched with the image displayed on the display. The shooting angle error in the implementation process is avoided.
And S13, determining a target public brightness characteristic value according to the brightness characteristic values of all the backlight areas.
After determining the characteristic value of the luminance degree of each backlight area, the target common characteristic value of the luminance degree can be determined according to the characteristic values of the luminance degree of all the backlight areas.
S14, calculating a correction parameter for adjusting the brightness characteristic value of the backlight area to the target public brightness characteristic value aiming at each backlight area; the correction parameters are used for adjusting the brightness of the corresponding backlight area, so that the brightness of each backlight area on the backlight plate has uniformity.
The uniformity specifically means that the luminance of each backlight area is uniform and the chromaticity space is consistent, that is, each backlight area has the same luminance and the same chromaticity space. The same display source signal is shown to correspond to the same chromaticity of the image displayed on the display.
After determining the luminance and chrominance characteristic values of the backlight regions and the target common luminance and chrominance characteristic value, a correction parameter for adjusting the luminance and chrominance characteristic value of the backlight region to the target common luminance and chrominance characteristic value is calculated for each backlight region, so that the correction parameter of each backlight region on the backlight panel of the display can be obtained.
In this way, by acquiring a luminance and chrominance image respectively corresponding to each backlight area on a display, the luminance and chrominance image is captured with the transmittance of the display configured as a preset transmittance. And determining the characteristic value of the brightness and the chrominance of each backlight area based on the brightness and chrominance image respectively corresponding to each backlight area. And determining a target public brightness characteristic value according to the brightness characteristic values of all the backlight areas. And calculating a correction parameter for adjusting the brightness characteristic value of the backlight area to the target public brightness characteristic value aiming at each backlight area. And adjusting the brightness of the corresponding backlight area according to the correction parameters of the backlight areas so that the brightness of the backlight areas on the backlight plate of the display is uniform, thereby improving the quality of the image displayed on the display.
Optionally, the preset transmittance includes: red preset transmittance, green preset transmittance and blue preset transmittance; the luminance and chrominance images of each backlight area comprise a first luminance and chrominance image, a second luminance and chrominance image and a third luminance and chrominance image of the backlight area, and correspondingly, the luminance and chrominance images respectively corresponding to the backlight areas on the display are obtained, and the method comprises the following steps:
under the condition that the transmittance of the display is configured to be the red preset transmittance, acquiring the first bright-chrominance images corresponding to the backlight areas on the display respectively;
under the condition that the transmittance of the display is configured to be the preset green transmittance, acquiring the second bright-chrominance images corresponding to the backlight areas on the display respectively;
and under the condition that the transmittance of the display is configured to be the preset blue transmittance, acquiring the third bright-chrominance images respectively corresponding to the backlight areas on the display.
In an implementation, the luminance and chrominance images of each backlight area can be acquired from the camera after the camera acquires the luminance and chrominance images of all the backlight areas. And the system can also interact with a camera in real time, and the synchronous camera acquires the brightness and chrominance images of each backlight area.
It should be understood that, regardless of whether the LED lamps on the backlight plate are three-primary-color LED lamps or single-color LED lamps, the first luminance and chrominance image, the second luminance and chrominance image and the third luminance and chrominance image when each backlight area is independently lit can be obtained by shooting with a camera under the condition that the transmittance of the display is sequentially configured to be the red preset transmittance, the green preset transmittance and the blue preset transmittance. The first bright chrominance image is a red chrominance image, the second bright chrominance image is a green chrominance image, and the third bright chrominance image is a blue chrominance image.
It should be understood that different ratios of the three primary colors red, green and blue correspond to different colors. Therefore, when the luminance and chrominance correction method is used for correcting the luminance and chrominance of the LED lamp on the backlight plate, the correction needs to be performed from three chromaticities of red, green and blue. It should be noted here that, when the LED lamps on the backlight plate are three-primary-color LED lamps, the characteristic value of the luminance and chromaticity of each backlight area is a tristimulus value. Wherein the tristimulus values are indicative of the amount of stimulus levels of the three primary colors causing a certain color sensation to the retina of the human body. When the LED lamps on the backlight plate are monochromatic LED lamps, the characteristic value of the brightness and the chrominance of each backlight area is a brightness value.
Optionally, the luminance and chrominance characteristic values include a luminance characteristic value and a chrominance characteristic value. In an implementation, the luminance characteristic value or the chrominance characteristic value of each luminance and chrominance image is calculated by the following formula:
One possible way, the relationship between the parameter k in the above formula and the luminance-chrominance image of the backlight area can be as shown in fig. 2. Specifically, the circular area in fig. 2 represents a luminance and chrominance image of a backlight area, and the whole square area is the field of the parameter k in the above calculation formula. Wherein k represents the contour field for identifying the bright chroma image. It will be understood by those skilled in the art that the area of the identified outline of the image should be greater than or equal to the bright color image area after the background noise in the bright color image is removed.
It should be noted that, when the LED lamp on the backlight plate is a monochromatic LED lamp, the luminance characteristic value of each backlight area is calculated by the above calculation formula, where the luminance characteristic value of each backlight area is a luminance value. And when the LED lamps on the backlight plate are tricolor LED lamps, the characteristic value of the brightness and the chromaticity of each backlight area is a tristimulus value, and the characteristic value comprises the brightness information and the chromaticity information of the backlight area. That is, in this case, the feature value of the luminance of the backlight area is a 3 × 3 array. Specifically, tristimulus values based on three primary colors can be calculated by respectively aiming at the first bright chrominance image, the second bright chrominance image and the third bright chrominance imageIs characterized by
Wherein Xr, Yr and Zr represent red tristimulus values in the luminance characteristic values of the back light area, Xg, Yg and Zg represent green tristimulus values in the luminance characteristic values of the back light area, and Xb, Yb and Zb represent blue tristimulus values in the luminance characteristic values of the back light area.
When the LED lamps on the backlight plate are tricolor LED lamps, the brightness characteristic value and the chromaticity characteristic value of the backlight area can be respectively calculated through the calculation formula.
Optionally, the target public brightness characteristic value is determined according to the brightness characteristic values of all the backlight areas, specifically, the target public brightness characteristic value in the target public brightness characteristic value may be obtained by multiplying an average value of the brightness characteristic values of all the backlight areas by a preset coefficient, where the preset coefficient is a positive number not greater than 1; and determining a common color gamut of all the backlight areas according to the chromaticity characteristic values of all the backlight areas, wherein the common color gamut is a target chromaticity characteristic value in the target common bright chromaticity characteristic values.
In other words, the target luminance characteristic value of the backlight panel of the whole display can be determined according to the luminance characteristic values of all backlight areas, and in practice, the average value of the luminance characteristic values of all backlight areas can be multiplied by a preset coefficient to obtain the target luminance characteristic value in the target common luminance and chrominance characteristic value. Based on similar calculation principles, other statistical methods can be adopted to determine the target brightness characteristic value based on the brightness characteristic values of all the backlight areas. Other statistical means are weighting, histogram statistics, etc.
And determining a target chromaticity characteristic value in the target public brightness characteristic value according to the chromaticity characteristic values of all the backlight areas, specifically determining the intersection of the color gamuts of all the backlight areas according to the chromaticity characteristic values of all the backlight areas. Referring to fig. 3, fig. 3 shows a color gamut surrounded by RGB color coordinates of a backlight area. And the common color gamut is a common color gamut triangle surrounded by color coordinates of each colored LED backlight area on the chromaticity diagram. Thus, the target lightness characteristic value may characterize the common color gamut of each backlight region.
It should be understood that, since the luminance and chrominance characteristic values of each backlight area are tristimulus values, the tristimulus values representing the luminance and chrominance characteristic values of the backlight area can be converted based on the luminance and chrominance characteristic values of each backlight area. In the related art, the tristimulus values are respectively characterized as
Where X, Y, Z is the tristimulus value, and x, Y on the right side of the equation characterize the color coordinates and brightness. The formula for calculating the tristimulus value color-changing coordinate is
It should be noted that after the target common luminance is determined, the luminance and the ratio of the target primary color corresponding to the white balance color temperature and the adjusted maximum luminance are also determined, so as to ensure that the corrected color temperature and luminance meet the actual requirements.
Optionally, the correction parameter of each backlight area is calculated by the following formula:
wherein the content of the first and second substances,
characteristic values of the luminance and chrominance of the backlight area are represented,
the correction parameters for representing the backlight area, wherein Crr is the brightness coefficient of a red light when the display source signal is red; cgr is the brightness coefficient of the green light when the display source signal is red; cbr is the brightness coefficient of the blue light when the display source signal is red; crg is the brightness coefficient of a red light when the display source signal is green; cgg is the brightness coefficient of the green light when the display source signal is green; cbg is the brightness coefficient of the blue light when the display source signal is green;crb is the brightness coefficient of a red light when the display source signal is blue; cgb is the luminance coefficient of the green light when the display source signal is blue; cbb is the luminance coefficient of the blue lamp when the display source signal is blue,
and characterizing the target public brightness characteristic values, wherein Xr1, Yr1 and Zr1 characterize red tristimulus values in the target public brightness characteristic values of the backlight area, Xg1, Yg1 and Zg1 characterize green tristimulus values in the target public brightness characteristic values of the backlight area, and Xb1, Yb1 and Zb1 characterize blue tristimulus values in the target public brightness characteristic values of the backlight area.
It should be noted that, when a plurality of LED lamps are included in the backlight area, the correction parameters for the backlight area are used for all the LED lamps in the backlight area
Correction control is performed.
Based on the same inventive concept, the disclosed embodiments also provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method according to any one of the above-mentioned first aspects.
The embodiment of the present disclosure further provides a luminance and chrominance correction apparatus, as shown in fig. 4, the apparatus 700 may include: a processor 701 and a memory 702. The apparatus 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.
The processor 701 is configured to control the overall operation of the apparatus 700 to complete all or part of the steps of the luminance and chrominance correction method. The memory 702 is used to store various types of data to support operation of the apparatus 700, such as instructions for any application or method operating on the apparatus 700 and application-related data, such as contact data, messaging, pictures, audio, video, and the like. The Memory 702 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia components 703 may include screen and audio components. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 702 or transmitted through the communication component 705. The audio assembly also includes at least one speaker for outputting audio signals. The I/O interface 704 provides an interface between the processor 701 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the apparatus 700 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, which is not limited herein. The corresponding communication component 705 may thus include: Wi-Fi module, Bluetooth module, NFC module, etc.
In an exemplary embodiment, the apparatus 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described luminance and chrominance correction method.
In another exemplary embodiment, a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the above-described luminance and chrominance correction method is also provided. For example, the computer readable storage medium may be the memory 702 described above comprising program instructions executable by the processor 701 of the apparatus 700 to perform the luminance and chrominance correction method described above.
The apparatus 700 may be a terminal device independent from a display. In one implementation, the apparatus 700 may be integrated on a display.
Therefore, an embodiment of the present disclosure further provides a display, including the luminance and chrominance correction apparatus 700.
The embodiment of the present disclosure further provides a luminance and chrominance correction system, and referring to fig. 5, a luminance and chrominance correction system 500 includes a display 502 and a luminance and chrominance correction device 501 communicatively connected to the display;
the brightness and chrominance correction device 501 is configured to send a brightness and chrominance correction instruction to the display after obtaining the correction parameter according to any one of the above methods, where the brightness and chrominance correction instruction includes the correction parameter;
the display 502 is configured to, in response to receiving a luminance and chrominance correction instruction sent by the luminance and chrominance correction device, correct parameters of a backlight plate of the display according to correction parameters in the luminance and chrominance correction instruction.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A luminance and chrominance correction method, comprising:
acquiring a brightness and chrominance image corresponding to each backlight area on a display, wherein the brightness and chrominance image is shot under the condition that the transmittance of the display is configured to be a preset transmittance;
determining a brightness characteristic value of each backlight area based on the brightness image corresponding to each backlight area;
determining a target public brightness characteristic value according to the brightness characteristic values of all the backlight areas;
calculating a correction parameter for adjusting the brightness characteristic value of the backlight area to the target public brightness characteristic value aiming at each backlight area;
the correction parameters are used for adjusting the brightness of the corresponding backlight area, so that the brightness of each backlight area on the backlight plate has uniformity.
2. The method of claim 1, wherein the predetermined transmittance comprises: red preset transmittance, green preset transmittance and blue preset transmittance; the luminance and chrominance images of each backlight area include a first luminance and chrominance image, a second luminance and chrominance image, and a third luminance and chrominance image of the backlight area, and accordingly, the obtaining of the luminance and chrominance images respectively corresponding to the backlight areas on the display includes:
under the condition that the transmittance of the display is configured to be the red preset transmittance, acquiring the first bright-chrominance images corresponding to the backlight areas on the display respectively;
under the condition that the transmittance of the display is configured to be the preset green transmittance, acquiring the second bright-chrominance images corresponding to the backlight areas on the display respectively;
and under the condition that the transmittance of the display is configured to be the preset blue transmittance, acquiring the third bright-chrominance images respectively corresponding to the backlight areas on the display.
3. The method of claim 2, wherein the luminance-chrominance characteristic value of each backlight area is a tristimulus value.
4. The method according to any one of claims 1 to 3, wherein the bright chroma feature values comprise a luma feature value and a chroma feature value;
the method further comprises the following steps: calculating the luminance characteristic value or the chrominance characteristic value of each luminance and chrominance image by the following formula:
5. The method of claim 4, wherein determining a target common luminance and chrominance characteristic value according to the luminance and chrominance characteristic values of all the backlight areas comprises:
obtaining a target brightness characteristic value in the target public brightness characteristic value by multiplying a preset coefficient according to the average value of the brightness characteristic values of all the backlight areas, wherein the preset coefficient is a positive number not greater than 1;
and determining a common color gamut of all the backlight areas according to the chromaticity characteristic values of all the backlight areas, wherein the common color gamut is a target chromaticity characteristic value in the target common bright chromaticity characteristic values.
6. The method of claim 3, wherein the correction parameter for each backlight zone is calculated by the following formula:
wherein the content of the first and second substances,
characteristic values of the luminance and chrominance of the backlight area are represented,
the correction parameters characterizing the backlight area,
and characterizing the characteristic value of the target public brightness degree.
7. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
8. A luminance and chrominance correction apparatus, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 6.
9. A display comprising the luminance and chrominance correction apparatus of claim 8.
10. A brightness and chrominance correction system is characterized by comprising a display and a brightness and chrominance correction device which is in communication connection with the display;
the brightness and chrominance correction device is used for sending a brightness and chrominance correction instruction to the display after obtaining the correction parameter according to the method of any one of claims 1-6, wherein the brightness and chrominance correction instruction comprises the correction parameter;
the display is used for responding to the received brightness and chrominance correction instruction sent by the brightness and chrominance correction device and correcting backlight plate parameters of the display according to the correction parameters in the brightness and chrominance correction instruction.
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| PCT/CN2020/100710 WO2022006756A1 (en) | 2020-07-07 | 2020-07-07 | Brightness and chroma correction method, apparatus and system, storage medium, and display |
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