CN112543968A - Display control device and method for determining light intensity of backlight area - Google Patents
Display control device and method for determining light intensity of backlight area Download PDFInfo
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- CN112543968A CN112543968A CN202080003290.9A CN202080003290A CN112543968A CN 112543968 A CN112543968 A CN 112543968A CN 202080003290 A CN202080003290 A CN 202080003290A CN 112543968 A CN112543968 A CN 112543968A
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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
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
Abstract
The disclosure relates to a display control device and a method for determining light intensity of a backlight area. The display control device includes: the display main control circuit determines the initial transmittance and the initial brightness corresponding to each pixel point on the display according to the received image video signal; the processing unit is used for calculating the gray value of each pixel point in the image according to the received image video signal, determining the target gray value of the image area according to the gray value of each pixel point in the image area aiming at each image area, and respectively determining the light intensity of each backlight area on the corresponding backlight plate according to the target gray value of each image area; the adjusting circuit determines the brightness corresponding to each pixel point on the display according to the light intensity of each backlight area on the backlight plate, and adjusts the transmittance of the pixel point according to the brightness of each pixel point, so that the product of the brightness corresponding to each pixel point on the display and the transmittance is equal to the product of the initial brightness and the initial transmittance of the pixel point.
Description
Technical Field
The disclosure relates to the technical field of backlight displays, in particular to a display control device and a method for determining light intensity of a backlight area.
Background
A backlight display generally includes a backlight panel and a liquid crystal display panel (LCD). The liquid crystal display panel is composed of a color filter substrate having red, green and blue color filter patterns and a liquid crystal layer. The backlight plate is composed of Light Emitting Diodes (LEDs) or fluorescent light sources. The liquid crystal display panel itself does not have a light emitting property. The liquid crystal display panel is illuminated by the backlight and selectively filters a portion of the colors, thereby displaying images of different colors.
The currently commonly used backlight plate is an edge type backlight plate or a direct type backlight plate. In the related art, the light intensity distribution information of the entire backlight panel is acquired by lighting the LED lamps on the entire backlight panel, and the video image signal is processed based on the light intensity distribution information of the backlight panel to display the video image on the liquid crystal display panel. Because the light intensity distribution information of the backlight plate is obtained under the condition of lighting the LED lamps on the whole backlight plate, the backlight brightness of the backlight plate can not be dynamically adjusted along with the change of display contents, so that when the image display contents are dark, the light intensity utilization rate of the backlight plate is not high, and energy waste is caused. In addition, the transmittance of the lcd panel cannot be adjusted to 0%, which results in poor contrast when the lcd displays video images.
Disclosure of Invention
The purpose of the present disclosure is to provide a display control device and a method for determining light intensity of a backlight area thereof, so as to respectively adjust the light intensity of each backlight area on a backlight plate according to an image video to be displayed, and improve the light intensity utilization rate of the backlight plate.
In order to achieve the above object, according to a first part of the embodiments of the present disclosure, there is provided a display control apparatus including one or more integrated circuits;
wherein the one or more integrated circuits comprise:
the display main control circuit is used for receiving an image video signal and determining the initial transmittance and the initial brightness corresponding to each pixel point on the display according to the image video signal;
the processing unit is used for calculating the gray value of each pixel point in an image according to the received image video signal, determining the target gray value of each image area according to the gray value of each pixel point in the image area aiming at each image area, and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area;
the adjusting circuit is used for determining the brightness corresponding to each pixel point on the display according to the light intensity of each backlight area on the backlight plate and adjusting the transmittance of each pixel point according to the brightness of each pixel point, so that the product of the brightness corresponding to each pixel point on the display and the transmittance is equal to the product of the initial brightness of the pixel point and the initial transmittance.
Optionally, the processing unit is specifically configured to:
calculating the red, green and blue channel values of each pixel point in the image according to the received image video signal, and determining the gray value of the pixel point according to the red, green and blue channel values;
aiming at each image area, determining a first target gray value of the image area according to the gray value of each pixel point in the image area;
taking the first target gray value of each image area as the target gray value of the corresponding image area;
and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
Optionally, before taking the first target gray-scale value of each image region as the target gray-scale value of the corresponding image region, the processing unit is further configured to:
for each image area, according to the first target gray values of the image area and the part of the adjacent image areas of the image area, performing smoothing processing on the first target gray values of the image area and the part of the adjacent image areas of the image area to respectively obtain second target gray values of the image area and the part of the adjacent image areas of the image area, so that the difference percentages between the second target gray values of the image area and the part of the adjacent image areas of the image area are within a preset percentage range; and are
And correspondingly taking the second target gray values of the image area and the part of the adjacent image area of the image area as the first target gray values of the image area and the part of the adjacent image area of the image area until all the image areas are subjected to smoothing processing.
Optionally, the processing unit performs smoothing processing on the first target gray values of all the image areas according to a first preset direction and/or a second preset direction.
Optionally, the smoothing, by the processing unit, the first target gray-scale values of each image region and the part of the adjacent image regions of the image region according to the first preset direction to obtain second target gray-scale values of the image region and the part of the adjacent image regions of the image region, respectively, includes:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s +1, t), (s, t +1), (s +1, t +1) by a coefficient K to obtain a smooth gray value, wherein K is greater than 0 and less than 1, and the image area with the coordinate (s +1, t), (s, t +1), (s +1, t +1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s +1, t), (s, t +1), (s +1, t +1), and taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
Optionally, the smoothing, by the processing unit, the first target gray-scale values of each image region and the part of the adjacent image regions of the image region according to the second preset direction to obtain second target gray-scale values of the image region and the part of the adjacent image regions of the image region, respectively, includes:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s-1, t), (s, t-1) and (s-1, t-1) by a coefficient K to obtain a smooth gray value, wherein the image area with the coordinate (s-1, t), (s, t-1) and (s-1, t-1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s-1, t), (s, t-1) and (s-1, t-1), taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
According to a second aspect of the embodiments of the present disclosure, there is provided a method for determining a light intensity of a backlight area, the method being applied to a processing unit in any one of the display control apparatuses in the first aspect, the method including:
calculating the gray value of each pixel point in the image according to the received image video signal, and determining the target gray value of the image area according to the gray value of each pixel point in the image area aiming at each image area;
and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
Optionally, the determining, for each image region, a target gray value of the image region according to the gray value of each pixel point in the image region includes:
aiming at each image area, determining a first target gray value of the image area according to the gray value of each pixel point in the image area;
taking the first target gray value of each image area as the target gray value of the corresponding image area;
and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
Optionally, before the first target grayscale value of each image region is taken as the target grayscale value of the corresponding image region, the method includes:
for each image area, according to the first target gray values of the image area and the part of the adjacent image areas of the image area, performing smoothing processing on the first target gray values of the image area and the part of the adjacent image areas of the image area to respectively obtain second target gray values of the image area and the part of the adjacent image areas of the image area, so that the difference percentages between the second target gray values of the image area and the part of the adjacent image areas of the image area are within a preset percentage range; and are
And correspondingly taking the second target gray values of the image area and the part of the adjacent image area of the image area as the first target gray values of the image area and the part of the adjacent image area of the image area until all the image areas are subjected to smoothing processing.
Optionally, smoothing is performed on the first target gray values of all the image regions according to a first preset direction and/or a second preset direction.
Optionally, smoothing the first target grayscale values of each image region and the part of the adjacent image region of the image region according to the first preset direction to obtain second target grayscale values of the image region and the part of the adjacent image region of the image region, respectively, includes:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s +1, t), (s, t +1), (s +1, t +1) by a coefficient K to obtain a smooth gray value, wherein K is greater than 0 and less than 1, and the image area with the coordinate (s +1, t), (s, t +1), (s +1, t +1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s +1, t), (s, t +1), (s +1, t +1), and taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
Optionally, smoothing the first target gray-scale values of each image region and the part of the adjacent image regions of the image region according to the second preset direction to obtain second target gray-scale values of the image region and the part of the adjacent image regions of the image region, respectively, includes:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s-1, t), (s, t-1) and (s-1, t-1) by a coefficient K to obtain a smooth gray value, wherein the image area with the coordinate (s-1, t), (s, t-1) and (s-1, t-1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s-1, t), (s, t-1) and (s-1, t-1), taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
According to a third part 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 second parts described above.
By adopting the technical scheme, the following technical effects can be at least achieved:
the processing unit can calculate the gray value of each pixel point in each frame of image of the image video according to the received image video signal. And aiming at each image area in each frame of image, determining a target gray value of the image area according to the gray value of each pixel point in the image area, and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area. Each image area corresponds to each pixel area on the display, and each pixel area on the display corresponds to each backlight area on the backlight plate. Therefore, the light intensity of each backlight area on the backlight plate can be respectively adjusted according to each frame of image in the image video to be displayed, and the light intensity of each backlight area on the backlight plate can be dynamically adjusted according to the change of continuous frame images in the image video, so that the light intensity utilization rate of the backlight plate is improved, and the problems in the related art are solved.
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 schematic structural diagram illustrating a display control apparatus according to an exemplary embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating specific execution steps of a processing unit according to an exemplary embodiment of the present disclosure.
Fig. 3 is a schematic diagram illustrating a division of an image into a plurality of image regions according to an exemplary embodiment of the present disclosure.
Fig. 4 is a flow chart illustrating a method of determining the intensity of a backlight area 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.
A backlight display generally includes a backlight panel and a liquid crystal display panel. The liquid crystal display panel is composed of a color filter substrate having red, green and blue color filter patterns and a liquid crystal layer. The backlight plate is composed of light emitting diodes or fluorescent light sources. The liquid crystal display panel itself does not have a light emitting property. The liquid crystal display panel is illuminated by the backlight and selectively filters a portion of the colors, thereby displaying images of different colors.
The currently commonly used backlight plate is an edge type backlight plate or a direct type backlight plate. In the related art, the light intensity distribution information of the entire backlight panel is obtained by lighting the LED lamps on the entire backlight panel or fitting the light intensity distribution information of the entire backlight panel based on the performance parameters of each LED lamp, and the video image signal is processed based on the light intensity distribution information of the backlight panel to display the video image on the liquid crystal display panel. Because the light intensity distribution information of the backlight plate is obtained under the condition of lighting the LED lamps on the whole backlight plate, the backlight brightness of the backlight plate can not be dynamically adjusted along with the change of display contents, so that when the display contents are dark, the light intensity utilization rate of the backlight plate is not high, and energy waste is caused. In addition, the transmittance of the lcd panel cannot be adjusted to 0%, which results in poor contrast when the lcd displays video images.
In view of this, the embodiments of the present disclosure provide a display control device and a method for determining light intensity of a backlight area thereof, so as to achieve the purpose of adjusting light intensity of each backlight area on a backlight board according to an image video to be displayed, and improving light intensity utilization rate of the backlight board.
First, an application scenario of the present disclosure is explained, and the technical solution of the present disclosure is applied to a display using a direct type backlight plate. It should be further noted that each pixel point on the display in the subsequent embodiments of the present disclosure represents each pixel point on the display panel (LCD) of the display.
Fig. 1 is a schematic structural diagram illustrating a display control apparatus 100 according to an exemplary embodiment of the present disclosure, the display control apparatus 100 including one or more integrated circuits;
wherein the one or more integrated circuits comprise: the display main control circuit 101 is configured to receive an image video signal, and determine an initial transmittance and an initial brightness corresponding to each pixel point on the display according to the image video signal; the processing unit 102 is configured to calculate a gray value of each pixel in an image according to the received image video signal, determine, for each image region, a target gray value of the image region according to the gray value of each pixel in the image region, and determine, according to the target gray value of each image region, a light intensity of each backlight area on a backlight board corresponding to each image region; the adjusting circuit 103 is configured to determine the brightness corresponding to each pixel point on the display according to the light intensity of each backlight area on the backlight board, and adjust the transmittance of each pixel point according to the brightness of the pixel point, so that the product of the brightness and the transmittance corresponding to each pixel point on the display is equal to the product of the initial brightness and the initial transmittance of the pixel point.
As will be appreciated by those skilled in the art, in the related art, before the display displays a video image, the display main control circuit 101 receives an image video signal to be displayed, and determines an initial transmittance of each pixel point on the display when displaying an image on the display and a corresponding initial brightness of each pixel point under an initial light intensity of the backlight plate according to the image video signal.
It should be noted that, after the backlight plate is divided into a plurality of backlight areas, the light intensity of each backlight area on the backlight plate can be controlled separately. In one embodiment, the backlight panel may be divided into a plurality of backlight regions of the same size, each backlight region including a plurality of light emitting diodes or fluorescent light sources. It is understood that each backlight area on the direct-type backlight plate 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. That is, each backlight region corresponds to an image area in the image to be displayed.
The processing unit 102 calculates a gray value of each pixel point in the image for each frame of image in the image video signal according to the received image video signal. And determining the target gray value of each image area of the image according to the gray value of each pixel point in the image area. And determining the light intensity of the backlight area corresponding to the image area according to the target gray value of the image area. Therefore, the light intensity of each backlight area on the backlight plate can be respectively determined according to the target gray value of each image area.
The method comprises the steps of determining the light intensity of a backlight area corresponding to an image area according to a target gray-scale value of the image area, and in an implementation mode, converting the target gray-scale value of the image area into a brightness adjusting coefficient a, controlling the brightness of each light bead in the backlight area according to the adjusting coefficient a by a driving circuit of the backlight area, and determining the light intensity of the backlight area according to the brightness of each light bead. The expression for determining the light intensity of the backlight area according to the adjustment coefficient a can be L (s, T) ═ a.T (s, T)gWherein g is a gamma coefficient, L (s, T) is the light intensity of the backlight area corresponding to the image area, and T (s, T) is the target gray value of the image area.
The adjusting circuit 103 determines the brightness corresponding to each pixel point on the display according to the light intensity of each backlight area determined in the processing unit 102, and adjusts the transmittance of the pixel point according to the brightness corresponding to each pixel point, so that the product of the brightness and the transmittance corresponding to each pixel point on the display is equal to the product of the initial brightness and the initial transmittance of the pixel point.
It should be noted that, the product of the luminance and the transmittance corresponding to each pixel point on the display is always equal to the product of the initial luminance and the initial transmittance of the pixel point, which is beneficial to adjusting the light intensity of each backlight area on the backlight plate without affecting the video image effect presented on the display.
In this way, the processing unit 102 can calculate the gray value of each pixel point in each frame of image of the image video according to the received image video signal. And aiming at each image area in each frame of image, determining a target gray value of the image area according to the gray value of each pixel point in the image area, and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area. Therefore, the light intensity of each backlight area on the backlight plate can be respectively adjusted according to each frame of image in the image video to be displayed, and the light intensity of each backlight area on the backlight plate can be dynamically adjusted according to the change of continuous frame images in the image video, so that the light intensity utilization rate of the backlight plate is improved, and the problems in the related art are solved.
Referring to fig. 2, in an implementation, the processing unit 102 is specifically configured to perform the following steps:
s201, calculating the red, green and blue channel values of each pixel point in the image according to the received image video signal, and determining the gray value of the pixel point according to the red, green and blue channel values.
It is understood that each pixel has three channels, red, green and blue. The gray scale of each channel represents the proportion of red, green and blue in each pixel. Therefore, the channel values described above in this disclosure represent the gray-scale values of the corresponding channels. The red, green and blue channel values of each pixel point in the image are respectively calculated, and the maximum value of the red, green and blue channel values of the pixel point can be used as the gray value of the pixel point. The average value or the weighted sum of the red, green and blue channel values can also be used as the gray value of the pixel point. It is understood that the gray value of each pixel corresponds to the brightness of the pixel.
In an implementation manner, the gray value of each pixel point can be calculated by the following calculation formula:
i (I, j) ═ max (R (I, j), G (I, j), B (I, j)), where (I, j) is the coordinate of a pixel and I (I, j) is the grayscale value of the pixel.
S202, aiming at each image area, determining a first target gray value of the image area according to the gray value of each pixel point in the image area;
for example, in S202, specifically, for each image region, the maximum gray value of the gray values of each pixel point in the image region is used as the first target gray value of the image region; or expanding the mean value of the gray values of the pixels in the image area by N times to serve as the first target gray value of the image area, wherein N is a number greater than zero.
In an implementation manner, for each image area, the maximum gray-scale value of the gray-scale values corresponding to the pixels in the image area is used as the first target gray-scale value of the image area. Illustratively, the first target gradation value of each image area is calculated by the following calculation formula:
In another implementation, for each image region, an average value of the gray-scale values corresponding to the pixel points in the image region is calculated, and the average value is enlarged by N times to be used as the first target gray-scale value of the image region. Wherein N may be a value greater than 0, such as 1.5, 2, 2.1, and the like, and the disclosure is not particularly limited thereto.
As another example, S202 may specifically calculate the first target gray-scale value of each image region by using the following calculation formula:
value is n × Max + (1-n) × Avg, wherein Value represents a first target gray Value of an image area, Max represents the maximum Value of gray values of all pixel points in the image area, Avg represents the average Value of gray values of all pixel points in the image area, and n is a constant of 0-1.
S203, for each image area, according to the first target gray values of the image area and the part of the adjacent image areas of the image area, performing smoothing processing on the first target gray values of the image area and the part of the adjacent image areas of the image area to obtain second target gray values of the image area and the part of the adjacent image areas of the image area respectively, so that the difference percentage between the second target gray values of the image area and the part of the adjacent image areas of the image area is within a preset percentage range.
For example, referring to fig. 3, for the image area numbered 00 in fig. 3, the adjacent image areas of the image area are image areas of 01, 10, and 11, and thus part of the adjacent image areas of the image area are at least one of 01, 10, and 11.
By way of further example, with continued reference to fig. 3, for the image region numbered 11 in fig. 3, the image regions adjacent to the image region are numbered 00, 01, 02, 10, 12, 20, 21, 22, and thus the image region has at least one of the image regions adjacent to the image region in part 00, 01, 02, 10, 12, 20, 21, 22.
By way of further example, with continued reference to fig. 3, for the image region numbered 01 in fig. 3, the image regions adjacent to the image region are numbered 00, 10, 11, 12, 02, and thus the image region has at least one of its partial adjacent image regions 00, 10, 11, 12, 02.
For example, it is assumed that, for an image area 00, a first target grayscale value of the image area 00 and first target grayscale values of some adjacent image areas 01, 10, and 11 of the image area 00 are smoothed to obtain second target grayscale values of the image area 00 and the image areas 01, 10, and 11, respectively, where a difference percentage between any two values of the second target grayscale values of the image areas 00, 01, 10, and 11 is within a preset percentage range. The preset percentage range is set according to actual requirements, for example, set to 0 to 5%, or set to 5% to 10%, or set to 0 to 15%.
And S204, correspondingly taking the second target gray values of the image area and the part of the adjacent image areas of the image area as first target gray values of the image area and the part of the adjacent image areas of the image area until the first target gray values of each image area are taken as the target gray values of the image area after smoothing processing is carried out on all the image areas.
For example, with continuing reference to fig. 3, after determining the second target grayscale values of the image area 00 and the partial neighboring image areas 01, 10, and 11 for the image area 00, the second target grayscale values of the image areas 00, 01, 10, and 11 are corresponded to be the first target grayscale values of the image areas 00, 01, 10, and 11. Next, after determining the second target gradation values of the image area 01 and the partial adjacent image areas 02, 11, 12 for the image area 01, the second target gradation values of the image areas 01, 02, 11, 12 are made to correspond to the first target gradation values of the image areas 01, 02, 11, 12; then, after determining the second target gray-scale values of the image area 02 and the part of the adjacent image areas 03, 12, and 13 for the image area 02, the second target gray-scale values of the image areas 02, 03, 12, and 13 are made to correspond to the first target gray-scale values of the image areas 02, 03, 12, and 13, and thus, after determining that the smoothing process is performed on all the image areas in fig. 3, the first target gray-scale value of each image area is made to be the target gray-scale value of the corresponding image area.
S205, respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
The light intensity of the backlight area corresponding to each image area determined in the steps S201 to S204 is determined according to the target gray-scale value of each image area, so that the excessive difference of the light intensity of the adjacent backlight areas can be avoided.
Optionally, the processing unit 102 may perform smoothing processing on the first target gray-scale values of all the image areas according to a first preset direction and/or a second preset direction.
With continued reference to fig. 3, the first predetermined direction may be a direction from 00, 01, 02, 03, 10, 11 to 33, and the second predetermined direction is a reverse order of the first predetermined direction. In an implementation manner, the processing unit 102 may perform smoothing processing on the first target gray-scale value of each image region in sequence according to a first preset direction. In another implementation, the processing unit 102 may perform smoothing processing on the first target gray-scale value of each image region in sequence according to a second preset direction. In another implementation manner, the processing unit 102 may perform smoothing on the first target gray-scale value of each image region in sequence according to a first preset direction, and then perform smoothing on the first target gray-scale value of each image region again according to a second preset direction. In another implementation manner, the processing unit 102 may perform smoothing processing on the first target gray-scale value of each image region in parallel according to the first preset direction and the second preset direction in sequence.
Optionally, the smoothing processing unit 102 performs smoothing processing on the first target gray scale value of each image area and the part of the adjacent image area of the image area according to the first preset direction to obtain second target gray scale values of the image area and the part of the adjacent image area of the image area respectively, where the smoothing processing includes:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s +1, t), (s, t +1), (s +1, t +1) by a coefficient K to obtain a smooth gray value, wherein K is greater than 0 and less than 1, and the image area with the coordinate (s +1, t), (s, t +1), (s +1, t +1) is the partial adjacent image area of the image area (s, t); and regarding each image area with the coordinates of (s, t), (s +1, t), (s, t +1), (s +1, t +1), and taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
It should be noted that K is a decimal number greater than 0 and less than 1, and is used to represent the difference in the gray scale values of the adjacent image regions, and the closer the value of K is to 1, the closer the gray scale value of the adjacent image region is represented.
Specifically, in the process of performing the smoothing process on each image region according to the first preset direction, when the smoothing process is performed on the image region with the coordinate (s, t), the image regions with the coordinates (s +1, t), (s, t +1), and (s +1, t +1) are part of adjacent image regions of the image region (s, t). Assume that the 4 first target grayscale values corresponding to the image regions with coordinates (s, T), (s +1, T), (s, T +1), (s +1, T +1) are T (s, T), T (s +1, T), T (s, T +1), and T (s +1, T +1), respectively. The maximum value Tm among T (s, T), T (s +1, T), T (s, T +1), and T (s +1, T +1) is multiplied by a coefficient K to obtain a smoothed gray value Tm × K. Next, for an image region with coordinates (s, T), the larger of T (s, T) and Tm × K is set as the second target gradation value of the image region. Similarly, for an image region with coordinates (s +1, T), the larger of T (s +1, T) and Tm × K is set as the second target gradation value of the image region. Regarding an image region with coordinates (s, T +1), the larger of T (s, T +1) and Tm × K is used as the second target gradation value of the image region. Regarding an image region with coordinates (s +1, T +1), the larger of T (s +1, T +1) and Tm × K is set as the second target gradation value of the image region.
Taking fig. 3 as an example for illustrative explanation, it is assumed that the first preset direction is a direction of 00, 01, 02, 03, 10, 11 to 33. The position of each image area is characterized by (s, t), where s characterizes the rows of the image area and t characterizes the columns of the image area. When the smoothing processing is performed on the image area having the coordinates (0, 0), the image areas having the coordinates (1, 0), (0, 1), and (1, 1) are partially adjacent image areas of the image area (0, 0). And multiplying the maximum value of the 4 first target gray values corresponding to the image areas with the coordinates of (0, 0), (1, 0), (0, 1) and (1, 1) by a coefficient K to obtain a smooth gray value. Then, for each image region with coordinates (0, 0), (1, 0), (0, 1), and (1, 1), the larger value of the first target gray-scale value and the smooth gray-scale value of the image region is used as the second target gray-scale value of the image region.
Optionally, the smoothing processing, by the processing unit 102, on the basis of the second preset direction, the first target gray-scale values of each image area and the part of the adjacent image areas of the image area are smoothed, so as to obtain second target gray-scale values of the image area and the part of the adjacent image areas of the image area respectively, where the smoothing processing includes:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s-1, t), (s, t-1) and (s-1, t-1) by a coefficient K to obtain a smooth gray value, wherein the image area with the coordinate (s-1, t), (s, t-1) and (s-1, t-1) is the partial adjacent image area of the image area (s, t); and regarding each image area with the coordinates of (s, t), (s-1, t), (s, t-1) and (s-1, t-1), taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
Taking fig. 3 as an example for illustration, the second preset direction is a direction of 33, 32, 31, 30, 23, 22 to 00. The position of each image area is characterized by (s, t), where s characterizes the rows of the image area and t characterizes the columns of the image area. When the smoothing processing is performed on the image area with the coordinates (3, 3), the image areas with the coordinates (2, 3), (3, 2), and (2, 2) are partially adjacent image areas of the image area (3, 3). Multiplying the maximum value of the 4 first target gray values corresponding to the image areas with the coordinates of (3, 3), (2, 3), (3, 2) and (2, 2) by a coefficient K to obtain a smooth gray value. Then, for each image region with coordinates ((3, 3), (2, 3), (3, 2) and (2, 2), the larger value of the first target gray-scale value and the smooth gray-scale value of the image region is used as the second target gray-scale value of the image region.
Based on the same inventive concept, the disclosed embodiment further provides a method for determining the light intensity of the backlight area, the method is applied to the processing unit 102 in any one of the display control apparatuses in the above embodiments, and referring to fig. 4, the method may include the following steps:
s401, calculating a gray value of each pixel point in an image according to the received image video signal, and determining a target gray value of the image area according to the gray value of each pixel point in the image area aiming at each image area;
s402, respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
By adopting the method, the gray value of each pixel point in each frame of image of the image video is calculated according to the received image video signal. And aiming at each image area in each frame of image, determining a target gray value of the image area according to the gray value of each pixel point in the image area, and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area. Therefore, the light intensity of each backlight area on the backlight plate can be respectively adjusted according to each frame of image in the image video to be displayed, and the light intensity of each backlight area on the backlight plate can be dynamically adjusted according to the change of continuous frame images in the image video, so that the light intensity utilization rate of the backlight plate is improved, and the problems in the related art are solved.
Optionally, the determining, for each image region, a target gray value of the image region according to the gray value of each pixel point in the image region includes:
aiming at each image area, determining a first target gray value of the image area according to the gray value of each pixel point in the image area;
taking the first target gray value of each image area as the target gray value of the corresponding image area;
and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
Optionally, before the first target grayscale value of each image region is taken as the target grayscale value of the corresponding image region, the method includes:
for each image area, according to the first target gray values of the image area and the part of the adjacent image areas of the image area, performing smoothing processing on the first target gray values of the image area and the part of the adjacent image areas of the image area to respectively obtain second target gray values of the image area and the part of the adjacent image areas of the image area, so that the difference percentages between the second target gray values of the image area and the part of the adjacent image areas of the image area are within a preset percentage range; and are
And correspondingly taking the second target gray values of the image area and the part of the adjacent image area of the image area as the first target gray values of the image area and the part of the adjacent image area of the image area until all the image areas are subjected to smoothing processing.
Optionally, smoothing is performed on the first target gray values of all the image regions according to a first preset direction and/or a second preset direction.
Optionally, smoothing the first target grayscale values of each image region and the part of the adjacent image region of the image region according to the first preset direction to obtain second target grayscale values of the image region and the part of the adjacent image region of the image region, respectively, includes:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s +1, t), (s, t +1), (s +1, t +1) by a coefficient K to obtain a smooth gray value, wherein K is greater than 0 and less than 1, and the image area with the coordinate (s +1, t), (s, t +1), (s +1, t +1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s +1, t), (s, t +1), (s +1, t +1), and taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
Optionally, smoothing the first target gray-scale values of each image region and the part of the adjacent image regions of the image region according to the second preset direction to obtain second target gray-scale values of the image region and the part of the adjacent image regions of the image region, respectively, includes:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s-1, t), (s, t-1) and (s-1, t-1) by a coefficient K to obtain a smooth gray value, wherein the image area with the coordinate (s-1, t), (s, t-1) and (s-1, t-1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s-1, t), (s, t-1) and (s-1, t-1), taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
With regard to the steps in the above-described embodiments, the detailed implementation of each step has been described in detail in the embodiments related to the display control apparatus, and will not be elaborated herein.
Embodiments of the present disclosure also provide a computer program product comprising a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-mentioned method of determining the intensity of a backlight when executed by the programmable apparatus.
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 (13)
1. A display control apparatus comprising one or more integrated circuits;
wherein the one or more integrated circuits comprise:
the display main control circuit is used for receiving an image video signal and determining the initial transmittance and the initial brightness corresponding to each pixel point on the display according to the image video signal;
the processing unit is used for calculating the gray value of each pixel point in an image according to the received image video signal, determining the target gray value of each image area according to the gray value of each pixel point in the image area aiming at each image area, and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area;
the adjusting circuit is used for determining the brightness corresponding to each pixel point on the display according to the light intensity of each backlight area on the backlight plate and adjusting the transmittance of each pixel point according to the brightness of each pixel point, so that the product of the brightness corresponding to each pixel point on the display and the transmittance is equal to the product of the initial brightness of the pixel point and the initial transmittance.
2. The display control device according to claim 1, wherein the processing unit is specifically configured to:
calculating the red, green and blue channel values of each pixel point in the image according to the received image video signal, and determining the gray value of the pixel point according to the red, green and blue channel values;
aiming at each image area, determining a first target gray value of the image area according to the gray value of each pixel point in the image area;
taking the first target gray value of each image area as the target gray value of the corresponding image area;
and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
3. The display control device according to claim 2, wherein before the first target gray-scale value of each of the image areas is taken as the target gray-scale value of the corresponding image area, the processing unit is further configured to:
for each image area, according to the first target gray values of the image area and the part of the adjacent image areas of the image area, performing smoothing processing on the first target gray values of the image area and the part of the adjacent image areas of the image area to respectively obtain second target gray values of the image area and the part of the adjacent image areas of the image area, so that the difference percentages between the second target gray values of the image area and the part of the adjacent image areas of the image area are within a preset percentage range; and are
And correspondingly taking the second target gray values of the image area and the part of the adjacent image area of the image area as the first target gray values of the image area and the part of the adjacent image area of the image area until all the image areas are subjected to smoothing processing.
4. The apparatus according to claim 3, wherein the processing unit performs smoothing processing on the first target gray-scale values of all the image areas according to a first preset direction and/or a second preset direction.
5. The apparatus according to claim 4, wherein the processing unit performs a smoothing process on the first target gray-scale values of each of the image areas and the image areas adjacent to the image areas in the first predetermined direction to obtain second target gray-scale values of the image areas and the image areas adjacent to the image areas, respectively, and comprises:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s +1, t), (s, t +1), (s +1, t +1) by a coefficient K to obtain a smooth gray value, wherein K is greater than 0 and less than 1, and the image area with the coordinate (s +1, t), (s, t +1), (s +1, t +1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s +1, t), (s, t +1), (s +1, t +1), and taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
6. The apparatus according to claim 4, wherein the processing unit performs a smoothing process on the first target gray-scale values of each of the image areas and the image areas adjacent to the image areas in the second predetermined direction to obtain second target gray-scale values of the image areas and the image areas adjacent to the image areas, respectively, and comprises:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s-1, t), (s, t-1) and (s-1, t-1) by a coefficient K to obtain a smooth gray value, wherein the image area with the coordinate (s-1, t), (s, t-1) and (s-1, t-1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s-1, t), (s, t-1) and (s-1, t-1), taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
7. A method for determining the intensity of a backlight area, the method being applied to a processing unit in the display control apparatus of claim 1, the method comprising:
calculating the gray value of each pixel point in the image according to the received image video signal, and determining the target gray value of the image area according to the gray value of each pixel point in the image area aiming at each image area;
and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
8. The method of claim 7, wherein the determining, for each image region, the target gray-scale value of the image region according to the gray-scale values of the pixels in the image region comprises:
aiming at each image area, determining a first target gray value of the image area according to the gray value of each pixel point in the image area;
taking the first target gray value of each image area as the target gray value of the corresponding image area;
and respectively determining the light intensity of each backlight area on the backlight plate corresponding to each image area according to the target gray value of each image area.
9. The method of claim 8, wherein before taking the first target gray-scale value of each image region as the target gray-scale value of the corresponding image region, the method comprises:
for each image area, according to the first target gray values of the image area and the part of the adjacent image areas of the image area, performing smoothing processing on the first target gray values of the image area and the part of the adjacent image areas of the image area to respectively obtain second target gray values of the image area and the part of the adjacent image areas of the image area, so that the difference percentages between the second target gray values of the image area and the part of the adjacent image areas of the image area are within a preset percentage range; and are
And correspondingly taking the second target gray values of the image area and the part of the adjacent image area of the image area as the first target gray values of the image area and the part of the adjacent image area of the image area until all the image areas are subjected to smoothing processing.
10. The method according to claim 9, wherein the first target gray-scale values of all the image regions are smoothed according to a first preset direction and/or a second preset direction.
11. The method according to claim 10, wherein smoothing the first target gray-scale values of each of the image regions and the image regions adjacent to the image regions in the first predetermined direction to obtain second target gray-scale values of the image regions and the image regions adjacent to the image regions, respectively, comprises:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s +1, t), (s, t +1), (s +1, t +1) by a coefficient K to obtain a smooth gray value, wherein K is greater than 0 and less than 1, and the image area with the coordinate (s +1, t), (s, t +1), (s +1, t +1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s +1, t), (s, t +1), (s +1, t +1), and taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
12. The method according to claim 10, wherein smoothing the first target gray-scale values of each of the image regions and the image regions adjacent to the image regions in the second predetermined direction to obtain second target gray-scale values of the image regions and the image regions adjacent to the image regions, respectively, comprises:
for the image area with the coordinate (s, t), multiplying the maximum value of the 4 first target gray values corresponding to the image area with the coordinate (s, t), (s-1, t), (s, t-1) and (s-1, t-1) by a coefficient K to obtain a smooth gray value, wherein the image area with the coordinate (s-1, t), (s, t-1) and (s-1, t-1) is the partial adjacent image area of the image area (s, t);
and regarding each image area with the coordinates of (s, t), (s-1, t), (s, t-1) and (s-1, t-1), taking the larger value of the first target gray value and the smooth gray value of the image area as the second target gray value of the image area.
13. 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 7 to 12.
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