CN110956587A - Display picture adjusting method and device - Google Patents
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- 238000012886 linear function Methods 0.000 claims description 5
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- G06T5/00—Image enhancement or restoration
- G06T5/40—Image enhancement or restoration by the use of histogram techniques
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Abstract
The invention discloses a method and a device for adjusting a display picture, which are used for carrying out equalization processing on a histogram in a mode of carrying out cutting reconstruction on an image method of the display picture under the condition of low backlight power consumption, but the cutting and the compensation both adopt a monotone decreasing function, so that an obtained image enhancement lookup table not only can adjust the brightness and the contrast of the display picture, but also can inhibit the conditions of noise and image distortion.
Description
Technical Field
The present invention relates to the field of power consumption adjustment, and in particular, to a method and an apparatus for adjusting a display screen.
Background
The backlight module in the liquid crystal display device is used for providing illumination for the display, generally, the brighter the backlight, the brighter the display picture, but the higher the power consumption, the darker the backlight, the darker the display picture, but the lower the power consumption; now, as the functions of the electronic device are more and more, the requirement for power consumption is higher and higher, and therefore, in order to save power consumption, the power consumption of the backlight can be reduced to reduce the power consumption of the whole device.
In order to clearly display the picture content while the backlight power consumption is reduced, a method of adjusting the gray scale brightness and the contrast of the picture may be adopted. However, in the prior art, the adjustment of the brightness and the contrast of the gray scale is generally linear or the non-linearity is poor, so that the picture distortion is caused after the contrast adjustment and the brightness adjustment of the gray scale of the picture.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for adjusting a display frame, which solve the problem in the prior art that the adjustment of the display frame is not distorted under the condition of low backlight power consumption.
The invention discloses a method for adjusting a display picture, which comprises the following steps:
acquiring a brightness distribution histogram of a picture to be displayed;
cutting the brightness histogram by adopting a preset first monotonic decreasing function to obtain a first brightness histogram and a second brightness histogram;
generating a second monotonic decreasing function according to the second brightness histogram and a preset first parameter;
reconstructing according to the second monotone decreasing function and the first brightness histogram to obtain a reconstructed brightness histogram;
acquiring the image enhancement lookup table according to the reconstructed brightness histogram;
and adjusting the brightness of the picture to be displayed according to the image enhancement lookup table.
Optionally, the method for generating the first monotonically decreasing function includes:
determining the lowest clipping boundary according to the area of the brightness distribution histogram of the picture to be displayed and a preset second parameter;
determining a highest clipping boundary according to the lowest clipping boundary of the first monotone decreasing function and a preset third parameter;
and generating the first monotone decreasing function according to a preset monotone decreasing function, the lowest clipping boundary and the highest clipping boundary.
Optionally, the generating a second monotonically decreasing function according to the second luminance histogram and a preset first parameter includes:
calculating the area average value of the second brightness histogram;
under the condition that the area average value of the second brightness histogram is smaller than or equal to the preset first sampling parameter, the second monotonic decreasing function is the average value of the area of the second brightness histogram;
and generating a second monotonic decreasing function according to the preset first parameter and the area average value of the second brightness histogram under the condition that the area average value of the second brightness histogram is larger than the second parameter.
Optionally, the first monotonically decreasing function includes: a linear function or a gamma function.
The invention also discloses a device for adjusting the display picture, which comprises:
the acquisition unit is used for acquiring a brightness distribution histogram of a picture to be displayed;
the cutting unit is used for cutting the brightness histogram by adopting a preset first monotone decreasing function to obtain a first brightness histogram and a second brightness histogram;
the first generating unit is used for generating a second monotonic decreasing function according to the second brightness histogram and a preset first parameter;
the reconstruction unit is used for reconstructing according to the second monotone decreasing function and the first brightness histogram to obtain a reconstructed brightness histogram;
the computing unit is used for computing the image enhancement lookup table according to the reconstructed brightness histogram;
and the adjusting unit is used for adjusting the brightness of the picture to be displayed according to the image enhancement lookup table.
Optionally, the method further includes:
the first determining unit is used for determining the lowest cutting boundary according to the area of the brightness distribution histogram of the picture to be displayed and a preset second parameter;
the second determining unit is used for determining the highest clipping boundary according to the lowest clipping boundary of the first monotone decreasing function and a preset third parameter;
and the second generating unit is used for generating the first monotone decreasing function according to a preset monotone decreasing function, the lowest clipping boundary and the highest clipping boundary.
Optionally, the first generating unit includes:
the first calculating subunit is used for calculating the area average value of the second brightness histogram;
the first determining subunit is configured to, when the area average value of the second luminance histogram is smaller than or equal to the preset first sampling parameter, determine that the second monotonic decreasing function is the average value of the area of the second luminance histogram;
and the second determining subunit is configured to generate a second monotonic decreasing function according to the preset first parameter and the area average value of the second luminance histogram, when the area average value of the second luminance histogram is greater than the second parameter.
Optionally, the first monotonically decreasing function includes: a linear function or a gamma function.
The embodiment of the invention discloses a method and a device for adjusting a display picture, which comprise the following steps: acquiring a brightness distribution histogram of a picture to be displayed; cutting the brightness histogram by adopting a preset first monotonic decreasing function to obtain a first brightness histogram and a second brightness histogram; reconstructing according to the second monotone decreasing function and the first brightness histogram to obtain a reconstructed brightness histogram; acquiring the image enhancement lookup table according to the reconstructed brightness histogram; and adjusting the brightness of the picture to be displayed according to the image enhancement lookup table. In this way, when the backlight power consumption is low, the histogram is equalized by performing cropping reconstruction on the image of the display screen, but the cropping and the compensation both use a monotonically decreasing function, and the obtained image enhancement look-up table can not only adjust the brightness and the contrast of the display screen, but also suppress noise and image distortion.
In addition, the image enhancement lookup table obtained by the invention can be smoothly transited in various scenes, and no screen flashing situation exists.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for adjusting a display screen according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a luminance histogram;
FIG. 3 shows a schematic diagram of a clipped luminance histogram;
FIG. 4 shows a schematic diagram of a second monotonically decreasing function;
FIG. 5 shows a schematic diagram of a reconstructed luminance histogram;
fig. 6 is a schematic structural diagram illustrating an adjusting apparatus for displaying a picture according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of an adjusting method for a display screen according to an embodiment of the present invention is shown, where the method includes:
s101: acquiring a brightness distribution histogram of a picture to be displayed;
in this embodiment, the luminance distribution histogram of the to-be-displayed picture reflects the luminance of the displayed picture, for example, as shown in fig. 2, the horizontal axis of the luminance histogram represents the gray level t, and the vertical axis represents the probability density of the gray level appearing in the picture.
S102: cutting the brightness histogram by adopting a preset first monotonic decreasing function to obtain a first brightness histogram and a second brightness histogram; the applicant has found that in the prior art, the luminance histogram is generally clipped by using a step function, but this may cause noise after image enhancement or cause extreme enhancement effect. In order to expand the histogram distribution of the dark region in the image as much as possible, and increase the contrast and brightness of the dark portion, in the present embodiment, a monotonic decreasing function is used to clip the brightness histogram.
For example, the monotonically decreasing function may be any one of monotonically decreasing functions, and in this embodiment, without limitation, a linearly decreasing function or a gamma function may be preferably used.
Moreover, in order to avoid picture distortion, a lowest clipping boundary and a highest clipping boundary may be determined according to a luminance histogram of a picture to be displayed, and specifically, the first monotonically decreasing function generating method includes:
determining the lowest clipping boundary according to the area of the brightness distribution histogram of the picture to be displayed and a preset second parameter;
determining a highest clipping boundary according to the lowest clipping boundary of the first monotone decreasing function and a preset third parameter;
and generating the first monotone decreasing function according to a preset monotone decreasing function, the lowest clipping boundary and the highest clipping boundary.
For example, the following steps are carried out: the second lowest clipping boundary and the highest clipping boundary may be calculated by the following equation 1):
wherein k represents a second parameter, the setting of the parameter can be preset by a technician or set according to the actual situation, g represents a third parameter, the setting of the parameter can be preset by the technician or set according to the actual situation, CminRepresenting the lowest clipping boundary of a first monotonically decreasing function, CmaxRepresenting the highest clipping boundary of the second monotonically decreasing function.
If the first monotonically decreasing function is a linear monotonically decreasing function, the generation of the first monotonically decreasing function may be represented by the following formula 2):
if the first monotonically decreasing function is a gamma function, the generation of the first monotonically decreasing function may be represented by the following formula 3):
in this embodiment, as shown in fig. 3, after the histogram of luminance distribution is clipped by the first monotonic decreasing function, a luminance histogram (first luminance histogram) h remaining after clipping can be obtainedcut(t) in the lower region of the first monotonically decreasing function shown in FIG. 4, a clipped luminance histogram, such as the shaded portion (second luminance histogram) s shown in FIG. 4, can also be obtainedcut(t)。
S103: generating a second monotonic decreasing function according to the second brightness histogram and a preset first parameter;
s104: reconstructing according to the second monotone decreasing function and the first brightness histogram to obtain a reconstructed brightness histogram;
in this embodiment, the first parameter is a parameter related to the luminance histogram of the image and the input backlight, and the first monotonically decreasing function is a compensation function of the clipped luminance histogram.
The applicant finds that, in the prior art, a uniform linear compensation mode is usually adopted to compensate the clipped luminance histogram, and the image enhancement look-up table obtained in this way may cause strong change of contrast or noise when adjusting the luminance and contrast of the display screen. In order to solve these problems, in the present application, the clipped histogram is compensated in a non-uniform compensation manner, specifically, the clipped histogram is compensated in a monotonically decreasing function, and specifically, S103 includes:
calculating the area average value of the second brightness histogram;
under the condition that the area average value of the second brightness histogram is smaller than or equal to the preset first sampling parameter, the second monotonic decreasing function is the average value of the area of the second brightness histogram;
and generating a second monotonic decreasing function according to the preset first parameter and the area average value of the second brightness histogram under the condition that the area average value of the second brightness histogram is larger than the second parameter.
For example, the following steps are carried out: as shown in the following formula 4),
as shown in figure 4 of the drawings,
the area average value of the second luminance histogram is represented, the compensation function is a monotonically decreasing function, and as shown in fig. 5, the clipped luminance histogram is compensated by the second monotonically decreasing function, and the obtained reconstructed luminance histogram can be represented as: u. ofr(t)＝hcut(t)+v(t)。
S105: acquiring the image enhancement lookup table according to the reconstructed brightness histogram;
for example, the enhanced look-up table may be calculated by equation 5) as follows:
in this embodiment, when the backlight power consumption is low, the histogram is equalized by performing cropping reconstruction on the image of the display screen, but the cropping and the compensation both use a monotonically decreasing function, so that the obtained image enhancement look-up table can not only adjust the brightness and the contrast of the display screen, but also suppress noise and image distortion.
Referring to fig. 6, a schematic structural diagram of an adjusting apparatus for displaying a picture according to an embodiment of the present invention is shown, in this embodiment, the apparatus includes:
an obtaining unit 201, configured to obtain a luminance distribution histogram of a to-be-displayed picture;
the cutting unit 202 is configured to cut the luminance histogram by using a preset first monotonic decreasing function to obtain a first luminance histogram and a second luminance histogram;
a first generating unit 203, configured to generate a second monotonic decreasing function according to the second luminance histogram and a preset first parameter;
a reconstructing unit 204, configured to perform reconstruction according to the second monotonically decreasing function and the first luminance histogram to obtain a reconstructed luminance histogram;
a calculating unit 205, configured to calculate the image enhancement look-up table according to the reconstructed luminance histogram;
and the adjusting unit 206 is configured to adjust the brightness of the picture to be displayed according to the image enhancement look-up table.
Optionally, the method further includes:
the first determining unit is used for determining the lowest clipping boundary according to the area of the brightness distribution histogram of the picture to be displayed and a preset second parameter;
the second determining unit is used for determining the highest clipping boundary according to the lowest clipping boundary of the first monotone decreasing function and a preset third parameter;
and the second generating unit is used for generating the first monotone decreasing function according to a preset monotone decreasing function, the lowest clipping boundary and the highest clipping boundary.
Optionally, the first generating unit includes:
the first calculating subunit is used for calculating the area average value of the second brightness histogram;
the first determining subunit is configured to, when the area average value of the second luminance histogram is smaller than or equal to the preset first sampling parameter, determine that the second monotonic decreasing function is the average value of the area of the second luminance histogram;
and the second determining subunit is configured to generate a second monotonic decreasing function according to the preset first parameter and the area average value of the second luminance histogram, when the area average value of the second luminance histogram is greater than the second parameter.
Optionally, the first monotonically decreasing function includes: a linear function or a gamma function.
By the device of the embodiment, the obtained image enhancement lookup table not only can adjust the brightness and the contrast of a display picture, but also inhibits the situations of noise and image distortion.
In addition, the image enhancement lookup table obtained by the invention can be smoothly transited in various scenes, and no screen flashing situation exists.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for adjusting a display screen, comprising:
acquiring a brightness distribution histogram of a picture to be displayed;
cutting the brightness histogram by adopting a preset first monotonic decreasing function to obtain a first brightness histogram and a second brightness histogram;
generating a second monotonic decreasing function according to the second brightness histogram and a preset first parameter;
reconstructing according to the second monotone decreasing function and the first brightness histogram to obtain a reconstructed brightness histogram;
acquiring the image enhancement lookup table according to the reconstructed brightness histogram;
and adjusting the brightness of the picture to be displayed according to the image enhancement lookup table.
2. The method of claim 1, wherein the generating of the first monotonically decreasing function comprises:
determining the lowest clipping boundary according to the area of the brightness distribution histogram of the picture to be displayed and a preset second parameter;
determining a highest clipping boundary according to the lowest clipping boundary of the first monotone decreasing function and a preset third parameter;
and generating the first monotone decreasing function according to a preset monotone decreasing function, the lowest clipping boundary and the highest clipping boundary.
3. The method according to claim 1, wherein generating a second monotonically decreasing function according to the second luminance histogram and a preset first parameter comprises:
calculating the area average value of the second brightness histogram;
under the condition that the area average value of the second brightness histogram is smaller than or equal to the preset first sampling parameter, the second monotonic decreasing function is the average value of the area of the second brightness histogram;
and generating a second monotonic decreasing function according to the preset first parameter and the area average value of the second brightness histogram under the condition that the area average value of the second brightness histogram is larger than the second parameter.
4. The method of claim 1, wherein the first monotonically decreasing function comprises: a linear function or a gamma function.
5. An apparatus for adjusting a display screen, comprising:
the acquisition unit is used for acquiring a brightness distribution histogram of a picture to be displayed;
the cutting unit is used for cutting the brightness histogram by adopting a preset first monotone decreasing function to obtain a first brightness histogram and a second brightness histogram;
the first generating unit is used for generating a second monotonic decreasing function according to the second brightness histogram and a preset first parameter;
the reconstruction unit is used for reconstructing according to the second monotone decreasing function and the first brightness histogram to obtain a reconstructed brightness histogram;
the computing unit is used for computing the image enhancement lookup table according to the reconstructed brightness histogram;
and the adjusting unit is used for adjusting the brightness of the picture to be displayed according to the image enhancement lookup table.
6. The apparatus of claim 5, further comprising:
the first determining unit is used for determining the lowest cutting boundary according to the area of the brightness distribution histogram of the picture to be displayed and a preset second parameter;
the second determining unit is used for determining the highest clipping boundary according to the lowest clipping boundary of the first monotone decreasing function and a preset third parameter;
and the second generating unit is used for generating the first monotone decreasing function according to a preset monotone decreasing function, the lowest clipping boundary and the highest clipping boundary.
7. The apparatus of claim 5, wherein the first generating unit comprises:
the first calculating subunit is used for calculating the area average value of the second brightness histogram;
the first determining subunit is configured to, when the area average value of the second luminance histogram is smaller than or equal to the preset first sampling parameter, determine that the second monotonic decreasing function is the average value of the area of the second luminance histogram;
and the second determining subunit is configured to generate a second monotonic decreasing function according to the preset first parameter and the area average value of the second luminance histogram, when the area average value of the second luminance histogram is greater than the second parameter.
8. The apparatus of claim 5, wherein the first monotonically decreasing function comprises: a linear function or a gamma function.
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