CN107689214B - Backlight adjusting method and device of intelligent display equipment - Google Patents
Backlight adjusting method and device of intelligent display equipment Download PDFInfo
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- CN107689214B CN107689214B CN201610643717.7A CN201610643717A CN107689214B CN 107689214 B CN107689214 B CN 107689214B CN 201610643717 A CN201610643717 A CN 201610643717A CN 107689214 B CN107689214 B CN 107689214B
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- 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
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Abstract
The embodiment of the invention provides a backlight adjusting method and device of intelligent display equipment, wherein the intelligent display equipment is provided with a plurality of screen areas, and the method comprises the following steps: acquiring the brightness average value and the brightness characteristic value of each area when the current frame image is output in the plurality of screen areas; determining the gray scale interval to which the brightness average value of each area belongs as a target gray scale interval; under the target gray scale interval, determining a corresponding backlight value and a corresponding compensation value according to the brightness characteristic value of the current screen area; wherein, under different target gray scale intervals, the backlight value and the corresponding compensation value are different; adjusting the backlight brightness of the current screen area by adopting the backlight value; and adjusting the display of the image by using the compensation value. The embodiment of the invention can determine the backlight value and the compensation value according to the proportion of the light and dark areas in different image contents, can obtain a better lighttight picture effect for the dark areas, can prevent the bright areas from being saturated, can lose the original picture level, and can improve the permeability and the detail level of the display picture.
Description
Technical Field
The invention relates to the technical field of intelligent display equipment, in particular to a backlight adjusting method and a backlight adjusting device.
Background
With continuous progress of scientific technology, the global 4K television market is growing rapidly, the goods output is estimated to reach 6065 thousands before 2017, the proportion of the goods in the whole television market is more than 24%, the 4K television adopts a Light-Emitting Diode (LED) as a backlight source, a liquid crystal display is used as an ultrathin television of a display screen, and the current resolution is 4096 × 2160 at most; 4K television has become an important milestone in the development of the television industry. The 4K television needs to have the characteristics of ultrathin property, environmental protection, energy conservation, excellent image quality and high contrast.
Most of 4K televisions in the market are in a side-in type light emitting mode, and light can be uniformly distributed on the whole television plane through a light guide plate. High contrast and good picture quality is achieved by backlight adjustment techniques. The current backlight adjusting technology mainly changes the brightness of each LED lamp by adjusting the current of each LED lamp, so that the backlight at a darker area in a picture is correspondingly darkened, and finally, a bright and bright visual effect is achieved.
A commonly used backlight adjustment technique is 2D dynamic backlight adjustment. The 2D dynamic backlight adjustment is to divide the whole backlight area into a plurality of horizontal and vertical partitions, and perform 2-dimensional adjustment of independent partition backlight brightness for each partition according to the brightness of image signals in the partition. In the prior art, the backlight value and the compensation value are calculated according to the image content in each backlight partition, so that the effects of reducing power consumption and improving contrast can be well achieved. However, in the implementation, the backlight value and the compensation value of each partition are calculated by using a uniform formula, so that the dark area and the bright area cannot be balanced under the condition of high picture complexity, and the backlight value cannot be finely controlled.
Disclosure of Invention
In view of the above problems, embodiments of the present invention are provided to provide a backlight adjusting method of a smart display device and a corresponding backlight adjusting apparatus of a smart display device, which overcome or at least partially solve the above problems.
In order to solve the above problem, an embodiment of the present invention discloses a backlight adjustment method for an intelligent display device, where the intelligent display device has multiple screen areas, and the method includes:
acquiring the brightness average value and the brightness characteristic value of each area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
determining the gray scale interval to which the brightness average value of each area belongs as a target gray scale interval;
under the target gray scale interval, determining a corresponding backlight value and a corresponding compensation value according to the brightness characteristic value of the current screen area; wherein, under different target gray scale intervals, the backlight value and the corresponding compensation value are different;
adjusting the backlight brightness of the current screen area by adopting the backlight value;
and adjusting the display of the image by using the compensation value.
Preferably, when the current frame image is output in the plurality of screen regions, the step of obtaining the brightness average value and the brightness characteristic value of each region includes:
calculating the brightness value of each pixel of the current frame image;
respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
and performing difference operation on the maximum brightness values and the average brightness values of the plurality of screen areas respectively to obtain the brightness characteristic values of the plurality of screen areas.
Preferably, the step of determining the gray scale section to which the brightness average value of each region belongs as the target gray scale section further includes:
obtaining gray scale parameters of the current frame image;
and dividing the gray scale parameters of the current frame image into N gray scale intervals, wherein N is greater than 1.
Preferably, the plurality of screen regions have different light and dark contrasts, the light and dark contrasts are divided into a first contrast, a second contrast and a third contrast, the third contrast is greater than the second contrast, the second contrast is greater than the first contrast, the corresponding backlight value is determined according to the brightness characteristic value of the current screen region in the target gray scale interval, and the corresponding compensation value includes:
obtaining the light and shade contrast of a plurality of screen areas according to the brightness characteristic value;
under the target gray scale interval, judging the brightness contrast of each screen area;
when the light and shade contrast belongs to a third contrast, the maximum value of the brightness of the corresponding screen area is used as a backlight value, and/or the maximum value of the backlight values of the plurality of screen areas is used as a compensation value;
when the light and shade contrast belongs to a second contrast, determining the value range of the backlight value as between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area, and/or determining the value range of the compensation value as between the backlight value of the corresponding screen area and the maximum value of the backlight values of the plurality of screen areas;
and when the light and shade contrast belongs to the first contrast, adopting the brightness average value of the corresponding screen area as a backlight value, and/or adopting the backlight value or the maximum value of the backlight value of the corresponding screen area as a compensation value.
Preferably, the sub-step of obtaining the light-dark contrast of a plurality of screen regions according to the brightness feature value further comprises:
judging a preset backlight threshold interval to which the brightness characteristic value belongs;
obtaining light and shade contrasts corresponding to the brightness characteristic values of the plurality of screen areas; and the preset backlight threshold interval is set according to the gray scale parameter of the current frame image.
The embodiment of the invention also discloses a backlight adjusting device of the intelligent display equipment, the intelligent display equipment is provided with a plurality of screen areas, and the device comprises:
the average value and characteristic value acquisition module is used for acquiring the brightness average value and the brightness characteristic value of each area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
the target gray scale interval determining module is used for determining the gray scale interval to which the brightness average value of each area belongs as a target gray scale interval;
the backlight value and compensation value determining module is used for determining a corresponding backlight value and a corresponding compensation value according to the brightness characteristic value of the current screen area in the target gray scale interval;
the backlight brightness adjusting module is used for adjusting the backlight brightness of the current screen area by adopting the backlight value;
and the display adjusting module is used for adjusting the display of the image by adopting the compensation value.
Preferably, the average value and characteristic value obtaining module includes:
the brightness value calculation submodule is used for calculating the brightness value of each pixel of the current frame image;
the average value and characteristic value operator module is used for respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
and the brightness characteristic value obtaining submodule is used for respectively carrying out difference operation on the brightness maximum value and the brightness average value of the plurality of screen areas to obtain the brightness characteristic values of the plurality of screen areas.
Preferably, the target gray scale interval determination module includes:
a gray scale parameter obtaining submodule for obtaining a gray scale parameter of the current frame image;
and the gray scale interval division submodule is used for dividing the gray scale parameters of the current frame image into N gray scale intervals, wherein N is greater than 1.
Preferably, the plurality of screen regions have different light and dark contrasts, the light and dark contrasts are divided into a first contrast, a second contrast and a third contrast, the third contrast is greater than the second contrast, the second contrast is greater than the first contrast, and the backlight value and compensation value determining module includes:
the bright-dark contrast obtaining submodule is used for obtaining the bright-dark contrasts of the plurality of screen areas according to the brightness characteristic values;
the light and shade contrast judgment submodule is used for judging the light and shade contrast of each screen area in the target gray scale interval;
the backlight value and compensation value first determining submodule is used for adopting the maximum value of the brightness of the corresponding screen area as the backlight value when the light and shade contrast belongs to the third contrast, and/or adopting the maximum value of the backlight values of the plurality of screen areas as the compensation value;
the backlight value and compensation value second determination submodule is used for determining the value range of the backlight value to be between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area and/or determining the value range of the compensation value to be between the backlight value of the corresponding screen area and the maximum value of the backlight values of the plurality of screen areas when the light and dark contrast belongs to the second contrast;
and the backlight value and compensation value third determining submodule is used for adopting the brightness average value of the corresponding screen area as the backlight value when the light and shade contrast belongs to the first contrast, and/or adopting the backlight value or the maximum value of the backlight value of the corresponding screen area as the compensation value.
Preferably, the bright-dark contrast obtaining sub-module further includes:
the brightness characteristic value judging unit is used for judging a preset backlight threshold value interval to which the brightness characteristic value belongs;
a brightness contrast obtaining unit, configured to obtain brightness contrasts corresponding to the brightness feature values of the plurality of screen regions; and the preset backlight threshold interval is set according to the gray scale parameter of the current frame image. The embodiment of the invention has the following advantages:
in the embodiment of the invention, the brightness value of the current frame image pixel is obtained, the brightness average value and the brightness maximum value of the corresponding screen area are calculated, the brightness characteristic value of the corresponding screen area is obtained, the gray scale interval corresponding to the brightness average value is determined as the target gray scale interval, the light and shade contrast of the corresponding screen area is judged in the target gray scale interval, and the backlight value and the compensation value of the corresponding screen area image are determined according to the light and shade contrast.
Further, under the target gray scale interval, the light and shade contrast of the corresponding screen area is judged, the light and shade contrast is divided into three layers, the backlight value and the compensation value can be determined according to the proportion of the light and shade area in different image contents, a better lighttight picture effect can be obtained for the dark area, the saturation can be prevented for the bright area, the original picture layer is lost, and the display picture permeability and the detail layer are improved.
Drawings
Fig. 1 is a flowchart illustrating a first step of a backlight adjusting method of an intelligent display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the division of a gray scale interval according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating steps of a second embodiment of a method for adjusting backlight of an intelligent display device according to the present invention;
fig. 4 is an internal structural view of an intelligent display device according to an embodiment of the present invention;
FIG. 5 is a flow chart of adjusting backlight brightness according to an embodiment of the present invention;
fig. 6 is a block diagram of a fourth embodiment of a backlight adjustment apparatus of an intelligent display device according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
One of the core concepts of the embodiments of the present invention is to divide the entire liquid crystal panel into a plurality of screen regions, calculate the average brightness value of the image corresponding to each screen region according to the brightness value of the pixel of the output current frame image, if the average brightness value is very low, it can be said that there are many black pixels (low brightness pixels) of the image, and if the average brightness value is very high, it can be said that there are many color pixels (high brightness pixels), in general, the average brightness value reflects the overall brightness level of the image corresponding to each screen region; on this basis, the embodiment of the present invention further compares the light-dark contrast of the image corresponding to each screen region, where the light-dark contrast may be a ratio of white pixels to black pixels, or a ratio of light pixels to dark pixels, and reflects a ratio of dark regions to bright regions of the image corresponding to each screen region.
Example one
Referring to fig. 1, a flowchart illustrating a first step of a backlight adjusting method of an intelligent display device according to an embodiment of the present invention is shown, where the intelligent display device has a plurality of screen areas, and the method specifically includes the following steps:
step 101: acquiring the brightness average value and the brightness characteristic value of each area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
in the embodiment of the present invention, when the intelligent display device is used to play a video, the step of obtaining the brightness average value and the brightness characteristic value of each region by calculating the brightness value of the pixel of the current frame image includes the following sub-steps:
step S1011: calculating the brightness value of each pixel of the current frame image;
step S1012: respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
step S1013: and performing difference operation on the maximum brightness values and the average brightness values of the plurality of screen areas respectively to obtain the brightness characteristic values of the plurality of screen areas.
The brightness value in step S1011 may be a maximum value of an image pixel point in a three-channel (RGB) color mode; for example, if the color depth of the image is 8 bits (bit), and one pixel point of the image is (243, 102, 100), the maximum value 243 of the pixel point is taken as the brightness value of the pixel point.
Further, the maximum brightness value and the average brightness value of a plurality of screen regions are calculated by using the brightness values, for example, under the condition that the image color depth is 8 bits (bit), 1000 pixel points exist in the corresponding screen region, wherein the brightness value of 100 pixel points is 233, and the brightness of other pixel points is lower than 233, the maximum brightness value of the screen region is considered to be 233; similarly, under the above conditions, the average brightness value of 1000 pixels in the corresponding screen region can be calculated.
Specifically, after the maximum brightness value and the average brightness value of each screen region are obtained through calculation, difference operation is performed on the maximum brightness value and the average brightness value of each screen region respectively to obtain a brightness characteristic value of each screen region, for example, if the maximum brightness value of the screen region is 233 and the average brightness value of the screen region is 123, the brightness characteristic value of the screen region is 110; and calculating the brightness characteristic values of all screen areas.
Step 102: determining the gray scale interval to which the brightness average value of each area belongs as a target gray scale interval;
referring to fig. 2, a schematic diagram of dividing a gray scale interval is shown, specifically, the step of determining the gray scale interval to which the brightness average value belongs as a target gray scale interval and determining the gray scale interval to which the brightness average value of each region belongs as the target gray scale interval further includes the following sub-steps before the step of determining the gray scale interval to which the brightness average value of each region belongs as the target gray scale interval:
step S1021: obtaining gray scale parameters of the current frame image;
step S1022: and dividing the gray scale parameters of the current frame image into N gray scale intervals, wherein N is greater than 1.
In practical application, referring to fig. 2, under the condition that the image depth is 8 bits, the gray scale parameter is 255, and is divided into 5 gray scale sections, the first gray scale section is [0, 20 ], the second gray scale section is [20, 64 ], the third gray scale section is [64-192 "), the fourth gray scale section is [ 192-. Judging the gray scale interval to which the brightness average value belongs, and determining the gray scale interval as a target gray scale interval, for example, the brightness average value of the corresponding screen area is 123, since 123 falls into a third gray scale interval, the third gray scale interval is [64-192 ], and the third gray scale interval is determined as the target gray scale interval.
Step 103: under the target gray scale interval, determining a corresponding backlight value and a corresponding compensation value according to the brightness characteristic value of the current screen area;
in the embodiment of the invention, under the condition of the target gray scale interval, the brightness characteristic value of the current screen area is further used for judging the brightness contrast, and the corresponding backlight value and the corresponding compensation value are determined.
Step 104: adjusting the backlight brightness of the current screen area by adopting the backlight value;
the backlight value is output to a corresponding control circuit to carry out drive control on the light emitting diode; and lightening the light emitting diodes of the corresponding screen area, and adjusting the backlight brightness of the current screen area.
Step 105: and adjusting the display of the image by using the compensation value.
And further, outputting the compensation value to a corresponding liquid crystal control circuit, compensating the next frame image point by point, and adjusting the display of the next frame image in a corresponding screen area.
In the embodiment of the invention, the brightness value of the pixel of the current frame image is obtained, the brightness average value and the brightness maximum value of the corresponding screen area are calculated, the brightness characteristic value of the corresponding screen area is obtained, the gray scale interval corresponding to the brightness average value is determined as a target gray scale interval, the light-dark contrast ratio of the corresponding screen area is further judged under the target gray scale interval, and the backlight value and the compensation value of the next frame image of the corresponding screen area are determined according to the light-dark contrast ratio; furthermore, the embodiment of the invention improves the image contrast of the intelligent display equipment and the permeability and detail level of the display picture.
Example two
Referring to fig. 3, a flowchart illustrating steps of a second embodiment of a backlight adjusting method for an intelligent display device according to an embodiment of the present invention is shown, which may specifically include the following steps:
step 201: acquiring the brightness average value and the brightness characteristic value of each area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
in practical application, the brightness value of each pixel of the current frame image is calculated; respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel; and performing difference operation on the maximum brightness values and the average brightness values of the plurality of screen areas respectively to obtain the brightness characteristic values of the plurality of screen areas. The brightness value can be the maximum value of an image pixel point in an RGB color mode; and then calculating the maximum brightness value and the average brightness value of a plurality of screen areas by adopting the brightness value, after calculating the maximum brightness value and the average brightness value of each screen area, respectively carrying out difference operation on the maximum brightness value and the average brightness value of each screen area to obtain the brightness characteristic value of each screen area, and calculating the brightness characteristic values of all the screen areas.
Step 202: determining the gray scale interval to which the brightness average value of each area belongs as a target gray scale interval;
in practical applications, the gray scale parameter may be divided into N gray scale intervals, where N >1, and the first gray scale interval, the second gray scale interval, the third gray scale interval, the fourth gray scale interval, and the fifth gray scale interval. And judging the gray scale interval to which the brightness average value belongs, and determining a certain gray scale interval as a target gray scale interval. In the embodiment of the invention, the gray scale parameters are divided into the gray scale intervals so as to integrally judge the brightness condition of the corresponding screen area and provide a basis for further judging the image content.
Step 203: obtaining the light and shade contrast of a plurality of screen areas according to the brightness characteristic value;
in a specific implementation, the step of obtaining the light-dark contrast of the plurality of screen regions according to the brightness feature value further includes the following sub-steps:
step S2031: judging a preset backlight threshold interval to which the brightness characteristic value belongs;
step S2032: obtaining light and shade contrasts corresponding to the brightness characteristic values of the plurality of screen areas; and the preset backlight threshold interval is set according to the gray scale parameter of the current frame image.
The contrast ratio is divided into a first contrast ratio, a second contrast ratio and a third contrast ratio, wherein the third contrast ratio is greater than the second contrast ratio, and the second contrast ratio is greater than the first contrast ratio; the first backlight threshold interval corresponds to a first contrast ratio, the second backlight threshold interval corresponds to a second contrast ratio, and the third backlight threshold interval corresponds to a third contrast ratio. In the embodiment of the present invention, on the basis of the target gray scale interval, the contrast of the light and dark in the corresponding screen area is determined, for example, under the condition that the image depth is 8 bits, the gray scale parameter is 255, and is divided into 5 gray scale intervals, the first gray scale interval is [0, 20 ], the second gray scale interval is [20, 64 ], the third gray scale interval is [64-192 ], the fourth gray scale interval is [192-224 "), the fifth gray scale interval is [224-255], the average value of the brightness of the corresponding screen area is 123, the brightness characteristic value of the screen area is 110, since 123 falls into the third gray scale interval is [ 64-192"), the third gray scale interval is determined as the target gray scale interval, under the condition that the third gray scale interval is the target gray scale interval, the preset backlight threshold interval can be set according to the gray scale parameter of the current frame image, for example, under the condition that the image depth is 8 bits. The preset backlight threshold interval may be divided into a first backlight threshold interval [0, 32 ], a second backlight threshold interval [32, 64), and a third backlight threshold interval [64, 255], where the luminance characteristic value of the screen region is 110, and thus the preset backlight threshold interval to which the luminance characteristic value belongs is determined to be the third backlight threshold interval. And obtaining the light and shade contrast of the corresponding screen area according to the brightness characteristic value, wherein the first backlight threshold interval corresponds to the first contrast, the second backlight threshold interval corresponds to the second contrast, and the third backlight threshold interval corresponds to the third contrast, so that the light and shade contrast of the corresponding screen area can be judged to be the third contrast. It should be noted that, in the embodiment of the present invention, the division of the light and dark contrast is based on the luminance characteristic value, and the luminance characteristic value represents a difference between the maximum luminance value and the average luminance value of the corresponding screen region, which can be interpreted as a difference between the maximum luminance value of the image and the average luminance level of the image, where the larger the luminance characteristic value is, the larger the difference between the maximum luminance value of the image and the average luminance level of the image is, and the higher the light and dark contrast is.
In addition, in the embodiment of the invention, the whole brightness level (gray scale interval) of the corresponding screen area is judged according to the brightness average value, and the brightness contrast of the corresponding screen area is further judged according to the light and dark contrast under the gray scale interval condition, so that a basis is provided for determining the backlight value and the compensation value.
Step 204: under the target gray scale interval, judging the brightness contrast of each screen area;
the brightness characteristic values are used for obtaining the brightness contrast of a plurality of screen regions, the first backlight threshold interval corresponds to the first contrast, the second backlight threshold interval corresponds to the second contrast, and the third backlight threshold interval corresponds to the third contrast, and the brightness contrast of each screen region is judged under the condition of the target gray scale interval, which may be the first contrast, the second contrast, and the third contrast.
Step 205: when the light and shade contrast belongs to a third contrast, the maximum value of the brightness of the corresponding screen area is used as a backlight value, and/or the maximum value of the backlight values of the plurality of screen areas is used as a compensation value;
in practical applications, when the luminance characteristic values of the corresponding screen regions respectively correspond to the third preset threshold intervals, the bright-dark contrast is the third contrast, and the maximum luminance value of the corresponding screen region is used as the backlight value, for example, the luminance average value of the corresponding screen region is 123, the luminance characteristic value of the screen region is 110, since the luminance average value 123 falls in the third gray scale interval and is [64-192 ], it is determined that the third gray scale interval is the target gray scale interval, and the luminance characteristic value of the screen region is 110, so that the preset backlight threshold interval to which the luminance characteristic value belongs is determined to be the third backlight threshold interval, and the third backlight threshold interval corresponds to the third contrast, and the maximum luminance value can be 233, which is used for adjusting the backlight luminance.
Further, under the condition of the target gray scale interval, the light-dark contrast of each screen area is judged, the backlight value of each screen area is obtained, the size of the backlight value of each screen area is compared, the maximum backlight value is obtained, when the light-dark contrast belongs to a third contrast, the maximum backlight value is adopted as the compensation value of the corresponding screen area, for example, if 1000 screen areas exist, the backlight value of each screen area is obtained, the maximum backlight value is calculated to be 230, when the light-dark contrast is the third contrast, the maximum backlight value 230 is adopted as the compensation value of the corresponding screen area, because the image of the third contrast belongs to the image with high light-dark contrast, the light-dark contrast can be the ratio of white pixel points to black pixel points, and can also be the ratio of light pixel points to dark pixel points, and the contrast of the corresponding image of each screen area is reflected, the backlight value is the maximum brightness value, so that the brightness of the picture can be ensured to the maximum extent, and the transparency of the picture is kept.
Step 206: and when the light and shade contrast belongs to a second contrast, determining the value range of the backlight value as between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area, and/or determining the value range of the compensation value as between the backlight value of the corresponding screen area and the maximum value of the backlight values of the plurality of screen areas.
In a specific implementation, under the condition of the target gray scale interval, when the light-dark contrast belongs to the second contrast, the value range of the backlight value is determined to be from the average brightness value to the maximum brightness value, and after the value range of the backlight value is determined, the backlight value can be further determined according to the following formula:
wherein BL is a backlight value, LocalavgAnd if the determined backlight value of the formula is larger than the maximum value of the brightness, determining the maximum value of the brightness as the backlight value.
Further, when the light-dark contrast belongs to the second contrast, after the backlight value of the corresponding screen region is determined, the value range of the compensation value is determined to be the maximum value from the backlight value of the corresponding screen region to the backlight values of the plurality of screen regions, and the compensation value can be further determined according to the following formula:
wherein BLcom(i) Compensation value for ith screen areaBL (i) is the backlight value of the ith screen area, BLmax_NThe image with the second contrast belongs to an image with medium light and shade contrast, the light and shade contrast is slightly lower, the image has multiple layers and rich details, the value range of the backlight value and the compensation value is large, and the value formula is related to the adjusting factor and the backlight value of the corresponding screen area, so that different backlight brightness can be better obtained along with the image content, and the display image quality with better brightness is ensured.
Step 207: and when the light and shade contrast belongs to the first contrast, adopting the brightness average value of the corresponding screen area as a backlight value, and/or adopting the backlight value or the maximum value of the backlight value of the corresponding screen area as a compensation value.
In practical application, when the luminance characteristic values of the corresponding screen regions respectively correspond to the first preset threshold intervals, the light-dark contrast is the first contrast, and the luminance average value of the corresponding screen region is used as the backlight value for adjusting the backlight luminance.
Further, under the condition of a target gray scale interval, judging the light-dark contrast of each screen area, and acquiring the backlight value of each screen area, when the target gray scale interval is a gray scale interval with a lower gray scale parameter and the light-dark contrast belongs to a first contrast, taking the maximum value of the backlight value of the corresponding screen area as a compensation value, for example, when the target gray scale interval is the first gray scale interval and the light-dark contrast is the first contrast, the image brightness is low and there is almost no light-dark contrast, and taking the backlight value as a brightness average value can obtain a better display effect on a dark area, and meanwhile, the compensation is performed as little as possible on the image, so that the dark area is ensured to be light-tight, and the maximum value of the backlight value of the corresponding screen area is taken as the compensation value.
Further, when the target gray scale interval is a gray scale interval with a higher gray scale parameter and the light-dark contrast belongs to the first contrast, the backlight value of the corresponding screen area is used as a compensation value, because the current frame image at the moment is a common image content, no high-brightness area exists and no obvious light-dark contrast exists, the image content can be brightened to the maximum extent at the moment, and the image quality is ensured.
Step 208: adjusting the backlight brightness of the current screen area by adopting the backlight value;
the backlight value is output to a corresponding control circuit to carry out drive control on the light emitting diode; and lightening the light emitting diodes of the corresponding screen area, and adjusting the backlight brightness of the current screen area.
Step 209: and adjusting the display of the image by using the compensation value.
And further, outputting the compensation value to a corresponding liquid crystal control circuit, compensating the next frame image point by point, and adjusting the display of the next frame image in a corresponding screen area. In the embodiment of the invention, under a target gray scale interval, the light and shade contrast of a corresponding screen area is further judged, and the light and shade contrast is divided into three layers: the first contrast, the second contrast and the third contrast can determine a backlight value and a compensation value according to the proportion of a light area and a dark area in different image contents, can obtain a better lighttight picture effect on the dark area, can prevent saturation on the bright area, loses the original picture level, and improves the display picture permeability and detail level.
It should be noted that the technical solutions expressed in the above embodiments are general judgment principles and implementation principles that are easy to be understood and written by those skilled in the art, and it should be well known by those skilled in the art that any person who adds or replaces other technical features on the basis of the embodiments of the present invention should be regarded as the technical solutions equivalent to the embodiments of the present invention.
EXAMPLE III
In order to make the embodiment of the present invention better understood, the following description is made by taking a specific example of adjusting the backlight brightness using the backlight value and the compensation value.
Referring to fig. 4, there is shown an internal configuration diagram of an intelligent Display device including a backlight source group 1 disposed on one side or both sides of a Liquid Crystal panel (LCD), a Liquid Crystal panel 2 displaying a video image, a PWM circuit controlling light emission of a determined value of a backlight source, a circuit determining a backlight value and a compensation value, a video converter, a backlight compensation circuit, a Liquid Crystal control circuit, and connections of the respective circuits. In which the side backlight is divided into N individually controllable backlight groups that respectively control corresponding areas on the LCD, as shown by the N dashed lines 1,2, … …. The backlight value of each area is determined according to the algorithm, and meanwhile, the compensation value of the illuminated area is determined and used for compensation of a subsequent backlight compensation circuit, the compensation circuit performs compensation brightening of the image according to the compensation value, image darkening caused by backlight dimming is eliminated, and the image is displayed on the LCD in a high-dynamic mode.
Referring to fig. 5, a flowchart of adjusting backlight brightness according to an embodiment of the present invention is shown, and a specific processing flow is shown in fig. 5, where a brightness value of each pixel of a current frame image is calculated according to pixel values input point by point; respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel; further determining the backlight value of the area, sequentially performing spatial filtering and temporal filtering on the backlight value, eliminating the problems of backlight unevenness in space and backlight flicker in time, finally outputting the backlight value to a PWM control circuit, performing LED drive control, illuminating a backlight Light Emitting Diode (LED) unit, determining a compensation value according to the backlight value, outputting the compensation value to a backlight compensation signal circuit, judging whether the compensation signal is 1, if so, directly outputting image data to an LCD for image display, otherwise, inputting the compensation value to obtain the compensation signal, and then performing image compensation point by point and outputting the compensation signal to the LCD for display.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Example four
Referring to fig. 6, a block diagram of a fourth embodiment of a backlight adjustment apparatus for an intelligent display device according to the present invention is shown, where the intelligent display device has multiple screen areas, and may specifically include the following modules:
an average and feature value obtaining module 301, configured to obtain a brightness average value and a brightness feature value of each region when the current frame image is output in the multiple screen regions; wherein the brightness characteristic value is used for representing contrast;
a target gray scale interval determining module 302, configured to determine a gray scale interval to which the brightness average value of each region belongs as a target gray scale interval;
a backlight value and compensation value determining module 303, configured to determine, in the target gray scale interval, a corresponding backlight value and a corresponding compensation value according to a brightness characteristic value of the current screen area;
a backlight brightness adjusting module 304, configured to adjust the backlight brightness of the current screen area by using the backlight value;
a display adjustment module 305 for adjusting the display of the image using the compensation value.
In a preferred embodiment of the present invention, the average value and characteristic value obtaining module includes:
the brightness value calculation submodule is used for calculating the brightness value of each pixel of the current frame image;
the average value and characteristic value operator module is used for respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
and the brightness characteristic value obtaining submodule is used for respectively carrying out difference operation on the brightness maximum value and the brightness average value of the plurality of screen areas to obtain the brightness characteristic values of the plurality of screen areas.
The target gray scale interval determination module further comprises:
a gray scale parameter obtaining submodule for obtaining a gray scale parameter of the current frame image;
and the gray scale interval division submodule is used for dividing the gray scale parameters of the current frame image into N gray scale intervals, wherein N is greater than 1.
In a preferred embodiment of the present invention, the plurality of screen regions have different light and dark contrasts, the light and dark contrasts are divided into a first contrast, a second contrast, and a third contrast, the third contrast is greater than the second contrast, the second contrast is greater than the first contrast, and the backlight value and compensation value determining module includes:
the bright-dark contrast obtaining submodule is used for obtaining the bright-dark contrasts of the plurality of screen areas according to the brightness characteristic values;
the light and shade contrast judgment submodule is used for judging the light and shade contrast of each screen area in the target gray scale interval;
the backlight value and compensation value first determining submodule is used for adopting the maximum value of the brightness of the corresponding screen area as the backlight value when the light and shade contrast belongs to the third contrast, and/or adopting the maximum value of the backlight values of the plurality of screen areas as the compensation value;
the backlight value and compensation value second determination submodule is used for determining the value range of the backlight value to be between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area and/or determining the value range of the compensation value to be between the backlight value of the corresponding screen area and the maximum value of the backlight values of the plurality of screen areas when the light and dark contrast belongs to the second contrast;
and the backlight value and compensation value third determining submodule is used for adopting the brightness average value of the corresponding screen area as the backlight value when the light and shade contrast belongs to the first contrast, and/or adopting the backlight value of the corresponding screen area as the compensation value.
The bright-dark contrast obtaining sub-module further includes:
the brightness characteristic value judging unit is used for judging a preset backlight threshold value interval to which the brightness characteristic value belongs;
a brightness contrast obtaining unit, configured to obtain brightness contrasts corresponding to the brightness feature values of the plurality of screen regions; and the preset backlight threshold interval is set according to the gray scale parameter of the current frame image.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method and the apparatus provided by the present invention are described in detail, and the principle and the embodiment of the present invention are explained by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A backlight adjustment method for an intelligent display device, the intelligent display device having a plurality of screen regions, wherein the plurality of screen regions have different bright and dark contrasts, the bright and dark contrasts are divided into a first contrast, a second contrast, and a third contrast, the third contrast is greater than the second contrast, and the second contrast is greater than the first contrast, the method comprising:
acquiring the brightness average value and the brightness characteristic value of each area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
determining the gray scale interval to which the brightness average value of each area belongs as a target gray scale interval;
under the target gray scale interval, determining a corresponding backlight value and a corresponding compensation value according to the brightness characteristic value of the current screen area; wherein, under different target gray scale intervals, the backlight value and the corresponding compensation value are different;
adjusting the backlight brightness of the current screen area by adopting the backlight value;
adjusting the display of the image using the compensation value;
under the target gray scale interval, determining a corresponding backlight value according to the brightness characteristic value of the current screen area, and determining a corresponding compensation value according to the brightness characteristic value of the current screen area, wherein the step of determining the corresponding compensation value comprises the following steps:
obtaining the light and shade contrast of a plurality of screen areas according to the brightness characteristic value;
under the target gray scale interval, judging the brightness contrast of each screen area;
when the light and shade contrast belongs to a third contrast, the maximum value of the brightness of the corresponding screen area is used as a backlight value, and/or the maximum value of the backlight values of the plurality of screen areas is used as a compensation value;
when the light and shade contrast belongs to a second contrast, determining the value range of the backlight value as between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area, and/or determining the value range of the compensation value as between the backlight value of the corresponding screen area and the maximum value of the backlight values of the plurality of screen areas;
and when the light and shade contrast belongs to the first contrast, adopting the brightness average value of the corresponding screen area as a backlight value, and/or adopting the backlight value or the maximum value of the backlight value of the corresponding screen area as a compensation value.
2. The method of claim 1, wherein the step of obtaining the average brightness value and the characteristic brightness value of each region when the current frame image is output in the plurality of screen regions comprises:
calculating the brightness value of each pixel of the current frame image;
respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
and performing difference operation on the maximum brightness values and the average brightness values of the plurality of screen areas respectively to obtain the brightness characteristic values of the plurality of screen areas.
3. The method according to claim 1, wherein the step of determining the gray scale interval to which the brightness average value of each region belongs as the target gray scale interval further comprises:
obtaining gray scale parameters of the current frame image;
and dividing the gray scale parameters of the current frame image into N gray scale intervals, wherein N is greater than 1.
4. The method according to claim 1, wherein the sub-step of obtaining the light-dark contrast of a plurality of screen regions from the luminance feature value further comprises:
judging a preset backlight threshold interval to which the brightness characteristic value belongs;
obtaining light and shade contrasts corresponding to the brightness characteristic values of the plurality of screen areas; and the preset backlight threshold interval is set according to the gray scale parameter of the current frame image.
5. A backlight adjustment apparatus for an intelligent display device, the intelligent display device having a plurality of screen regions, wherein the plurality of screen regions have different bright and dark contrasts, the bright and dark contrasts are divided into a first contrast, a second contrast, and a third contrast, the third contrast is greater than the second contrast, and the second contrast is greater than the first contrast, the apparatus comprising:
the average value and characteristic value acquisition module is used for acquiring the brightness average value and the brightness characteristic value of each area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
the target gray scale interval determining module is used for determining the gray scale interval to which the brightness average value of each area belongs as a target gray scale interval;
the backlight value and compensation value determining module is used for determining a corresponding backlight value and a corresponding compensation value according to the brightness characteristic value of the current screen area in the target gray scale interval;
the backlight brightness adjusting module is used for adjusting the backlight brightness of the current screen area by adopting the backlight value;
the display adjusting module is used for adjusting the display of the image by adopting the compensation value;
the backlight value and compensation value determining module comprises:
the bright-dark contrast obtaining submodule is used for obtaining the bright-dark contrasts of the plurality of screen areas according to the brightness characteristic values;
the light and shade contrast judgment submodule is used for judging the light and shade contrast of each screen area in the target gray scale interval;
the backlight value and compensation value first determining submodule is used for adopting the maximum value of the brightness of the corresponding screen area as the backlight value when the light and shade contrast belongs to the third contrast, and/or adopting the maximum value of the backlight values of the plurality of screen areas as the compensation value;
the backlight value and compensation value second determination submodule is used for determining the value range of the backlight value to be between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area and/or determining the value range of the compensation value to be between the backlight value of the corresponding screen area and the maximum value of the backlight values of the plurality of screen areas when the light and dark contrast belongs to the second contrast;
and the backlight value and compensation value third determining submodule is used for adopting the brightness average value of the corresponding screen area as the backlight value when the light and shade contrast belongs to the first contrast, and/or adopting the backlight value or the maximum value of the backlight value of the corresponding screen area as the compensation value.
6. The apparatus of claim 5, wherein the mean and eigenvalue acquisition module comprises:
the brightness value calculation submodule is used for calculating the brightness value of each pixel of the current frame image;
the average value and characteristic value operator module is used for respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
and the brightness characteristic value obtaining submodule is used for respectively carrying out difference operation on the brightness maximum value and the brightness average value of the plurality of screen areas to obtain the brightness characteristic values of the plurality of screen areas.
7. The apparatus of claim 5, wherein the target gray level interval determining module comprises:
a gray scale parameter obtaining submodule for obtaining a gray scale parameter of the current frame image;
and the gray scale interval division submodule is used for dividing the gray scale parameters of the current frame image into N gray scale intervals, wherein N is greater than 1.
8. The apparatus of claim 5, wherein the bright-dark contrast obtaining sub-module further comprises:
the brightness characteristic value judging unit is used for judging a preset backlight threshold value interval to which the brightness characteristic value belongs;
a brightness contrast obtaining unit, configured to obtain brightness contrasts corresponding to the brightness feature values of the plurality of screen regions; and the preset backlight threshold interval is set according to the gray scale parameter of the current frame image.
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