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WO2017088483A1 - 显示装置图像处理方法、系统、计算机程序和存储介质 - Google Patents

显示装置图像处理方法、系统、计算机程序和存储介质 Download PDF

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Publication number
WO2017088483A1
WO2017088483A1 PCT/CN2016/088653 CN2016088653W WO2017088483A1 WO 2017088483 A1 WO2017088483 A1 WO 2017088483A1 CN 2016088653 W CN2016088653 W CN 2016088653W WO 2017088483 A1 WO2017088483 A1 WO 2017088483A1
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Prior art keywords
backlight
brightness
value
brightness value
signal
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English (en)
French (fr)
Inventor
罗荣荣
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Le Holdings Beijing Co Ltd
Leshi Zhixin Electronic Technology Tianjin Co Ltd
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Le Holdings Beijing Co Ltd
Leshi Zhixin Electronic Technology Tianjin Co Ltd
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Publication of WO2017088483A1 publication Critical patent/WO2017088483A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • 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

Definitions

  • Embodiments of the present invention relate to the field of video image processing technologies, and in particular, to a display device image processing method, system, computer program, storage medium, and device.
  • LCD TVs are more and more popular because of their high brightness, high gray scale, light, thin and fashionable.
  • CRT Cathode Ray Tube
  • the power consumption is also significantly improved.
  • the liquid crystal panel is a passive display device, a separate backlight source must be provided to display an image through the liquid crystal as a controllable light valve. Therefore, the current LCD TV consumes a large amount of power, and the backlight power consumption accounts for more than 80%.
  • the main method for reducing power consumption of LCD TVs is backlighting to reduce power consumption.
  • the traditional method of reducing power consumption is to reduce the power consumption by reducing the brightness of the backlight.
  • the brightness of the TV picture is perceived by the human eye, and then the brightness of the screen is adjusted by adjusting the gray level of the image signal to adjust the brightness of the screen backlight. , to achieve backlight control.
  • the inventors have found that at least the following problems exist in the prior art: the existing backlight control is more likely to lose the gray level of the image, so that the gray scale is reduced, so that the whole (dark scene, medium bright scene) , highlight scene) screen brightness is reduced, seriously sacrificing picture quality.
  • the brightness of the backlight does not change with the brightness of the background of the picture, the brightness of the backlight is constant and the energy consumption is large.
  • An object of the present invention is to provide a display device image processing method, system, computer program, storage medium and device, which are used to solve the problem of reducing the power consumption of the display device without sacrificing the picture quality in the prior art. problem.
  • an embodiment of the present invention provides a display device image processing method, including the following steps:
  • the video input signal is analyzed to obtain a histogram and an average luminance value of the video frame image
  • the data level of the video input signal is dynamically increased according to the histogram, and the adjusted video signal is output to the liquid crystal panel.
  • adjusting the backlight brightness according to the average brightness value includes:
  • the brightness value signal to the backlight is dynamically adjusted according to the average brightness value of the video frame and the size of the brightness adjustment threshold THD set in advance.
  • an embodiment of the present invention further provides a display device image processing system, including:
  • a video signal analysis module configured to analyze a video input signal to obtain a histogram and an average brightness value of the video frame image
  • a backlight brightness adjustment module configured to adjust the brightness of the backlight according to the average brightness value, and output the adjusted brightness signal to the backlight;
  • the video signal enhancement module is configured to dynamically increase the data level of the video input signal according to the histogram, and output the adjusted video signal to the liquid crystal panel.
  • an embodiment of the present invention further provides a computer program, including program code, the program code for performing the following operations:
  • the video input signal is analyzed to obtain a histogram and an average luminance value of the video frame image
  • the data level of the video input signal is dynamically increased according to the histogram, and the adjusted video signal is output to the liquid crystal panel.
  • embodiments of the present invention also provide a storage medium having characteristics for storing the computer program described above.
  • an embodiment of the present invention further provides an apparatus, including:
  • One or more processors are One or more processors;
  • One or more program modules are One or more program modules
  • the one or more program modules are stored in the memory, and when executed by the one or more processors, perform the following operations:
  • the video input signal is analyzed to obtain a histogram and an average luminance value of the video frame image
  • the data level of the video input signal is dynamically increased according to the histogram, and the adjusted video signal is output to the liquid crystal panel.
  • the image processing method, system, computer program, storage medium and device of the display device provided by the embodiments of the present invention dynamically increase the data level of the video image by dynamically reducing the brightness of the backlight, thereby improving the contrast of the picture while reducing power consumption. Depth of field and layering, while saving energy, it can improve image quality.
  • FIG. 1 is a schematic flow chart of an image processing method of a display device according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a dynamic backlight curve according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a level duty ratio according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of dynamically adjusting an input level of an enhanced signal according to an embodiment of the present invention.
  • Figure 5a is a schematic diagram of the original screen
  • Figure 5b is a schematic diagram of the screen after dynamically adjusting the backlight
  • FIG. 5c is a schematic diagram of a screen after image processing according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an image processing system of a display device according to an embodiment of the present invention.
  • an embodiment of the present invention provides a display device image processing method, which includes the following steps: analyzing a video input signal to obtain a histogram and an average luminance value of a video frame image; and adjusting a backlight brightness according to an average luminance value, And outputting the adjusted brightness signal to the backlight; dynamically increasing the data level of the video input signal according to the histogram, and outputting the adjusted video signal to the liquid crystal panel.
  • the image processing method of the display device provided by the embodiment of the present invention will be described in detail below.
  • a histogram and an average brightness value (Average Pixel Level, APL for short) of each video frame image in the video signal are optionally analyzed by using an existing image analysis system.
  • a histogram of each video frame image is obtained by statistically calculating data of raw data of each pixel (Pixel) of each video frame image, and an average luminance value is obtained for each video frame image pixel. .
  • the backlight brightness is adjusted according to the average brightness value, and the adjusted brightness signal is output to the backlight.
  • the brightness value of the video input signal to the backlight is dynamically adjusted by the data enhancement system according to the average brightness value of the video frame and the preset brightness adjustment threshold THD (Threshold value).
  • the signal dynamically adjusts the backlight pulse width modulation value of the output luminance signal in real time as the average luminance value of the video frame of the video input signal changes.
  • the obtained average brightness value of the current video frame and the size of the brightness adjustment threshold set in advance are dynamically adjusted to the brightness value signal of the backlight. If the average brightness value of the current video frame is greater than or equal to the preset brightness adjustment threshold, 100% of the brightness value signal is output to the backlight, and the brightness value is as shown in the formula (1).
  • PWM represents the brightness value to the backlight.
  • the brightness value signal output to the backlight is adjusted according to the preset acceptable brightness value and the average brightness value and the preset brightness adjustment threshold, and the brightness value is as follows. Formula (2).
  • PWM represents a luminance value to the backlight
  • Base represents an acceptable luminance value
  • APL represents an average luminance value of the current video frame
  • THD represents a preset luminance adjustment threshold.
  • the acceptable brightness value Base and the preset brightness adjustment threshold THD can be flexibly set according to actual needs.
  • the embodiment of the invention adjusts the time when the backlight of the backlight is turned on or off according to the brightness value signal of the backlight.
  • ON indicates the time when the backlight is turned on
  • OFF indicates the time when the backlight is turned off.
  • the backlight brightness value is 100%
  • the backlight backlight is turned on for a long time
  • the backlight brightness value is 50%
  • the backlight on time is the same as the off time (50% each).
  • the backlight brightness value is At 17%
  • the backlight's backlight turn-on time is 17%
  • the backlight backlight turn-off time is 83%.
  • the adjusted backlight brightness signal is finally sent to the backlight of the display device.
  • it is optionally adjusted by a backlight pulse width modulation (PWM Duty) control system.
  • PWM Duty backlight pulse width modulation
  • the enhanced image signal is transmitted to the liquid crystal panel display by dynamically increasing the data level of the video input signal according to the histogram of the video frame.
  • the histogram distribution range of the current video frame can be expanded.
  • Dynamically increasing the data level of the video input signal can be processed by the existing histogram equalization (Histogram Equalization).
  • histogram equalization achieves contrast enhancement by adjusting the gray value using a cumulative function.
  • Histogram equalization is a method of adjusting contrast using an image histogram in the field of image processing.
  • This method is often used to increase the local contrast of many images, especially when the contrast of the useful data of the image is fairly close, by which the brightness can be better distributed over the histogram.
  • This can be used to enhance local contrast without affecting overall contrast, and histogram equalization achieves this by effectively extending the commonly used brightness. From the comparison of the video frame histogram enhancement in Figure 4, it can be clearly seen that the enhanced data range becomes wider and the histogram distribution becomes more uniform. Therefore, the displayed picture can be seen subjectively with higher contrast, layering and depth of field.
  • the original picture has a power consumption of 90 watts and a picture contrast of 74:1.
  • the brightness of the darkest area in the figure is 0.82 nits, and the brightness of the brightest area is 60.6 nits.
  • the power consumption of the dynamically adjusted picture is 57 watts, the contrast of the picture is 77:1, the brightness value of the darkest area in the figure is 0.52 nits, and the brightness value of the brightness area of the brightest area is 40.3 nits.
  • the image processing method and system of the display device provided by the embodiment of the present invention consumes 24 watts of power, and the screen contrast is 275:1.
  • the brightness of the darkest region in the figure is 0.22 nits.
  • the luminance value of the bright area of the bright area is 60.6 nits.
  • the method provided by the embodiment improves the contrast of the picture without reducing the brightness of the picture while reducing the power consumption. Therefore, according to the original picture, the embodiment of the present invention can significantly improve the picture clarity while reducing the work number on the basis of the original picture, and the picture contrast is higher, the layering and the depth of field become better. .
  • the present invention further provides an image processing system for a display device using the above method.
  • the system includes a video signal analysis module.
  • the histogram and the average brightness value of the video frame image are obtained by analyzing the video input signal;
  • the backlight brightness adjusting module is configured to adjust the backlight brightness according to the average brightness value, and output the adjusted brightness signal to the backlight;
  • the video signal enhancement module And for dynamically increasing the data level of the video input signal according to the histogram, and outputting the adjusted video signal to the liquid crystal panel.
  • the video signal analysis module analyzes a histogram and an average brightness value (Average Pixel Level) of each video frame image in the video signal by using an existing image analysis system.
  • APL Average Pixel Level
  • a histogram of each video frame image is obtained by statistically calculating data of raw data of each pixel (Pixel) of each video frame image, and an average luminance value is obtained for each video frame image pixel. .
  • the backlight brightness adjustment module dynamically adjusts the video input signal to the back through the data enhancement system according to the average brightness value of the video frame and the preset brightness adjustment threshold THD (Threshold value).
  • the brightness value signal of the light source dynamically adjusts the backlight pulse width modulation value of the output brightness signal in real time as the average brightness value of the video frame of the video input signal changes.
  • the backlight brightness adjustment module further includes a determining module, configured to dynamically adjust a brightness value signal to the backlight according to an average brightness value of the video frame and a preset brightness adjustment threshold. If the average brightness value of the current video frame is greater than or equal to the preset brightness adjustment threshold, 100% of the brightness value signal is output to the backlight, and the brightness value is as shown in the formula (3).
  • PWM represents the brightness value to the backlight.
  • the brightness value signal output to the backlight is adjusted according to the preset acceptable brightness value and the average brightness value and the preset brightness adjustment threshold, and the brightness value is as follows. Formula (4).
  • PWM represents a luminance value to the backlight
  • Base represents an acceptable luminance value
  • APL represents an average luminance value of the current video frame
  • THD represents a preset luminance adjustment threshold.
  • the acceptable brightness value Base and the preset brightness adjustment threshold THD can be flexibly set according to actual needs.
  • the embodiment of the invention adjusts the time when the backlight of the backlight is turned on or off according to the brightness value signal of the backlight.
  • ON indicates the time when the backlight is turned on
  • OFF indicates the time when the backlight is turned off.
  • the backlight brightness value is 100%
  • the backlight backlight is turned on for a long time
  • the backlight brightness value is 50%
  • the backlight on time is the same as the off time (50% each).
  • the backlight brightness value is 17%
  • the backlight backlighting time is 17%
  • the backlight backlight closing time is 83%.
  • the adjusted backlight brightness signal is finally sent to the backlight of the display device.
  • it is optionally adjusted by a backlight pulse width modulation (PWM Duty) control system.
  • PWM Duty backlight pulse width modulation
  • the video signal enhancement module dynamically increases the data level of the video input signal according to the histogram of the video frame to transmit the enhanced image signal to the liquid crystal panel display.
  • the histogram distribution range of the current video frame can be expanded.
  • Dynamically increasing the data level of the video input signal can be processed by the existing histogram equalization method (Histogram Equalization).
  • histogram equalization achieves contrast enhancement by adjusting the gray value using a cumulative function.
  • Histogram equalization is a method of adjusting contrast using an image histogram in the field of image processing.
  • This method is usually used Increase the local contrast of many images, especially when the contrast of the useful data of the image is fairly close. In this way, the brightness can be better distributed over the histogram. This can be used to enhance local contrast without affecting overall contrast, and histogram equalization achieves this by effectively extending the commonly used brightness. From the comparison of the video frame histogram enhancement in Figure 4, it can be clearly seen that the enhanced data range becomes wider and the histogram distribution becomes more uniform. From the subjective display, it can be seen that the contrast of the picture is higher, the layering and depth of field become better.
  • the original picture has a power consumption of 90 watts and a picture contrast of 74:1.
  • the brightness of the darkest area in the figure is 0.82 nits, and the brightness of the brightest area is 60.6 nits.
  • the power consumption of the dynamically adjusted picture is 57 watts, the contrast of the picture is 77:1, the brightness value of the darkest area in the figure is 0.52 nits, and the brightness value of the brightness area of the brightest area is 40.3 nits.
  • the image processing method and system of the display device provided by the embodiment of the present invention consumes 24 watts of power, and the screen contrast is 275:1.
  • the brightness of the darkest region in the figure is 0.22 nits.
  • the luminance value of the bright area of the bright area is 60.6 nits.
  • the method provided by the embodiment of the invention improves the contrast of the picture without reducing the brightness of the picture while reducing the power consumption. Therefore, according to the original picture, the embodiment of the present invention can significantly improve the picture clarity while reducing the work number on the basis of the original picture, and the picture contrast is higher, the layering and the depth of field become better. .
  • Another embodiment of the present invention also discloses a computer program, including program code, for performing the following operations:
  • the video input signal is analyzed to obtain a histogram and an average luminance value of the video frame image
  • the data level of the video input signal is dynamically increased according to the histogram, and the adjusted video signal is output to the liquid crystal panel.
  • Another embodiment of the present invention also discloses a storage medium for storing a computer program as described above.
  • the embodiment of the invention also discloses a device, the device comprising:
  • One or more processors are One or more processors;
  • One or more program modules are One or more program modules
  • the one or more program modules are stored in the memory, and when executed by the one or more processors, perform the following operations:
  • the video input signal is analyzed to obtain a histogram and an average luminance value of the video frame image
  • the data level of the video input signal is dynamically increased according to the histogram, and the adjusted video signal is output to the liquid crystal panel.
  • the image processing method, system, computer program, storage medium and device of the display device provided by the embodiments of the present invention dynamically improve the data level of the video image by dynamically reducing the brightness of the backlight, thereby improving the power consumption while improving the power consumption.
  • the contrast, depth of field and layering of the picture can save energy while improving image quality.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located A place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the steps of the foregoing method embodiments are included; and the foregoing storage medium includes: a ROM, a RAM, A variety of media that can store program code, such as a disk or an optical disk.

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Abstract

本发明实施例提供一种显示装置图像处理方法、系统、计算机程序、存储介质和装置，其中该方法包括如下步骤：对视频输入信号分析得到视频帧图像的直方图和平均亮度值；根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。本发明通过动态降低背光亮度，动态提升视频图像的数据电平，在降低功耗的同时提升了画面的对比度、景深和层次感，节能的同时又能很好的提升画质。

Description

显示装置图像处理方法、系统、计算机程序和存储介质
交叉引用
本发明实施例引用于2015年11月25日提交的专利名称为“一种显示装置图像处理方法及系统”的第2015108460370号中国专利申请。上述申请在此被引做参照。
技术领域
本发明的实施例涉及视频图像处理技术领域，尤其涉一种显示装置图像处理方法、系统、计算机程序、存储介质和装置。
背景技术
随着液晶显示技术的不断发展，液晶电视由于具有亮度高、灰度高、轻、薄、时尚的特点越来越受到人们的欢迎，且伴随着其性价比的提高，越来越多家庭、娱乐场所及广告媒体商将液晶电视作为首选娱乐显示终端。但由于液晶电视相较于以前CRT(阴极射线管，Cathode Ray Tube)电视其显示画面显著增大(一般为32英寸以上)，其所消耗的电能也有了明显的提高。由于液晶屏是被动型显示器件，必须提供单独的背光光源，通过液晶作为可控光阀来显示图像。因此，目前的液晶电视功耗较大，背光功耗占80％以上。在提倡节能环保的主旨下，对液晶电视降低功耗的方法主要是背光去降功耗。
传统降低功耗的做法是通过降低背光亮度来降低功耗，通过人眼感觉电视画面的明亮程度，然后通过调整背光强度的方法通过调节图像信号的灰阶对屏幕亮度适当调整，改变屏幕背光亮度，实现背光控制功能。在实现本发明实施例过程中，发明人发现现有技术中至少存在如下问题：现有的这种背光控制较容易损失图像的灰度等级使灰阶降低，使得整体(暗场景、中亮场景、高亮场景)画面亮度降低，严重牺牲画面质量。同时由于背光亮度不随画面背景亮暗变化而改变，背光亮度是恒定的，能耗较大。
发明内容
本发明实施例的目的在于，提供一种显示装置图像处理方法、系统、计算机程序、存储介质和装置，用以解决现有技术中在不牺牲画面质量的前提下，降低显示装置的功耗的问题。
一方面，本发明的实施例提供了一种显示装置图像处理方法，包括如下步骤：
对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
可选地，根据平均亮度值调整背光亮度包括：
根据视频帧的平均亮度值与预先设置的亮度调整阈值THD的大小动态调整向背光源的亮度值信号。
另一方面，本发明的实施例还提供一种显示装置图像处理系统，包括：
视频信号分析模块，用于对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
背光亮度调整模块，用于根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
视频信号增强模块，用于根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
另一方面，本发明的实施例还提供一种计算机程序，其特征在于，包括程序代码，所述程序代码用于执行如下操作：
对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
根据平均亮度值调整背光亮度，并将调整后的亮度信号输出 至背光源；
根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
另一方面，本发明的实施例还提供一种存储介质，其特性在与，用于存储上述的计算机程序。
另一方面，本发明的实施例还提供一种装置，其特征在于，包括：
一个或多个处理器；
存储器；
一个或多个程序模块；
所述一个或多个程序模块存储在所述存储器中，当被所述一个或多个处理器执行时，进行如下操作：
对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
本发明的实施例提供的显示装置图像处理方法、系统、计算机程序、存储介质和装置，通过动态降低背光亮度，动态提升视频图像的数据电平，在降低功耗的同时提升了画面的对比度、景深和层次感，节能的同时又能很好的提升画质。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例显示装置图像处理方法流程示意图；
图2是本发明实施例动态背光曲线示意图；
图3是本发明实施例电平占空比示意图；
图4是本发明实施例动态调整增强信号输入电平示意图；
图5a是原始画面示意图；
图5b是动态调整背光后的画面示意图；
图5c是本发明实施例图像处理后的画面示意图；
图6是本发明实施例显示装置图像处理系统结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图1所示，本发明实施例提供一种显示装置图像处理方法，该方法包括如下步骤：对视频输入信号分析得到视频帧图像的直方图和平均亮度值；根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。下面对本发明实施例提供的显示装置图像处理方法展开详细的说明。
首先，介绍对视频输入信号分析得到视频帧图像的直方图和平均亮度值的步骤。
如图1所示，在本发明实施例中，可选地通过现有的影像分析系统分析出视频信号中每个视频帧图像的直方图(Histogram)和平均亮度值(Average Pixel Level，简称APL)。例如，通过对每个视频帧图像的每个像素(Pixel)的原始数据进行统计得出的数据(data)得到每个视频帧图像的直方图，对每个视频帧图像的像素取平均亮度值。
其次，根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源。
如图2所示，得到视频帧的平均亮度值后，根据视频帧的平均亮度值与预先设置的亮度调整阈值THD(Threshold，门槛值)通过数据增强系统动态调整视频输入信号向背光源的亮度值信号，随视频输入信号的视频帧的平均亮度值的变化实时动态调整输出亮度信号的背光脉冲宽度调变值。
具体地，将得到的当前视频帧的平均亮度值与预先设置的亮度调整阈值的大小动态调整向背光源的亮度值信号。如果当前视频帧的平均亮度值大于等于预设的亮度调整阈值，则向背光源输出100％的亮度值信号，亮度值如式(1)所示。
PWM＝100％(APL≥THD)         (1)
其中，PWM表示向背光源的亮度值。
如果当前视频帧的平均亮度值小于预设的亮度调整阈值，则根据预先设置的可接受的亮度值、平均亮度值与预先设置的亮度调整阈值共同调整向背光源输出的亮度值信号，亮度值如式(2)所示。
Figure PCTCN2016088653-appb-000001
其中，PWM表示向背光源的亮度值，Base表示可接受的亮度值，APL表示当前视频帧的平均亮度值，THD表示预先设置的亮度调整阈值。在本发明实施例中，可接受的亮度值Base与预先设置的亮度调整阈值THD可以根据实际需求灵活设置。
本发明实施例根据背光源的亮度值信号调整背光源的背光开启或关闭的时间。如图3所示，ON表示背光开启的时间，OFF表示背光关闭的时间。例如，在一个视频帧画面中，在背光源亮度值100％时，背光源背光长期开启，在背光源亮度值为50％时，背光源开启时间与关闭时间相同(各占50％)。在背光源亮度值为 17％时，背光源的背光开启时间占17％，背光源背光关闭时间占83％。最终将调整后的背光亮度信号发送至显示装置的背光源。在本发明实施例中，可选地通过背光脉冲宽度调变值(PWM Duty)控制系统调整的。
如图4所示，得到视频帧的直方图值后，根据视频帧的直方图通过数据增强系统动态提升视频输入信号的数据电平将增强后的图像信号传输至液晶面板显示。具体地，如图4所示，通过动态提升视频输入信号的数据电平，可以将当前视频帧的直方图分布范围扩大。动态提升视频输入信号的数据电平可以通过现有的直方图均衡化(Histogram Equalization)对视频帧图像处理。具体地，直方图均衡化则通过使用累积函数对灰度值进行调整以实现对比度的增强。直方图均衡化是图像处理领域中利用图像直方图对对比度进行调整的方法。这种方法通常用来增加许多图像的局部对比度，尤其是当图像的有用数据的对比度相当接近时，通过这种方法，亮度可以更好地在直方图上分布。这样就可以用于增强局部的对比度而不影响整体的对比度，直方图均衡化通过有效地扩展常用的亮度来实现这种功能。由图4中视频帧直方图增强前后的对比，可以明显看出，增强后的数据范围变广了，直方图的分布也变得更均匀了。从而使显示的画面上主观上可以看出画面对比度更高、层次感和景深变得更好。
如图5a所示，原始画面的功耗90瓦，画面对比度为74：1，图中最暗区域的亮度值为0.82nits，最亮区域的亮度区域的亮度值为60.6nits。如图5b所示，动态调整的画面的功耗为57瓦，画面的对比度为77：1，图中最暗区域的亮度值为0.52nits，最亮区域的亮度区域的亮度值为40.3nits。通过动态调整背光画面的方式虽然降低了功耗但是，同时损失了画面的亮度。如图5c所示，采用本发明实施例提供的显示装置图像处理方法和系统处理过的画面功耗为24瓦，画面对比度为275:1，图中最暗区域的亮度值为0.22nits，最亮区域的亮度区域的亮度值为60.6nits。通过本发明实 施例提供的方法，在降低功耗的同时，不降低画面亮度，提高了画面的对比度。由此可知，本发明实施例在原有画面的基础上与传统动态调整背光的方式相比在降低工号的同时对画面清晰度有明显提升，画面对比度更高、层次感和景深变得更好。
为进一步体现本发明实施例提供的显示装置图像处理方法的优越性本发明实施例还提供一种应用上述方法的显示装置图像处理系统，如图6所示，该系统包括：视频信号分析模块，用于对视频输入信号分析得到视频帧图像的直方图和平均亮度值；背光亮度调整模块，用于根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；视频信号增强模块，用于根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
如图1所示，在本发明实施例中，视频信号分析模块，通过现有的影像分析系统分析出视频信号中每个视频帧图像的直方图(Histogram)和平均亮度值(Average Pixel Level，简称APL)。例如，通过对每个视频帧图像的每个像素(Pixel)的原始数据进行统计得出的数据(data)得到每个视频帧图像的直方图，对每个视频帧图像的像素取平均亮度值。
如图2所示，得到视频帧的平均亮度值后，背光亮度调整模块根据视频帧的平均亮度值与预先设置的亮度调整阈值THD(Threshold，门槛值)通过数据增强系统动态调整视频输入信号向背光源的亮度值信号，随视频输入信号的视频帧的平均亮度值的变化实时动态调整输出亮度信号的背光脉冲宽度调变值。
具体地，所述背光亮度调整模块还包括判断模块，所述判断模块用于根据视频帧的平均亮度值与预先设置的亮度调整阈值的大小动态调整向背光源的亮度值信号。如果当前视频帧的平均亮度值大于等于预设的亮度调整阈值，则向背光源输出100％的亮度值信号，亮度值如式(3)所示。
PWM＝100％(APL≥THD)          (3)
其中，PWM表示向背光源的亮度值。
如果当前视频帧的平均亮度值小于预设的亮度调整阈值，则根据预先设置的可接受的亮度值、平均亮度值与预先设置的亮度调整阈值共同调整向背光源输出的亮度值信号，亮度值如式(4)所示。
Figure PCTCN2016088653-appb-000002
其中，PWM表示向背光源的亮度值，Base表示可接受的亮度值，APL表示当前视频帧的平均亮度值，THD表示预先设置的亮度调整阈值。在本发明实施例中，可接受的亮度值Base与预先设置的亮度调整阈值THD可以根据实际需求灵活设置。
本发明实施例根据背光源的亮度值信号调整背光源的背光开启或关闭的时间。如图3所示，ON表示背光开启的时间，OFF表示背光关闭的时间。例如，在一个视频帧画面中，在背光源亮度值100％时，背光源背光长期开启，在背光源亮度值为50％时，背光源开启时间与关闭时间相同(各占50％)。在背光源亮度值为17％时，背光源的背光开启时间占17％，背光源背光关闭时间占83％。最终将调整后的背光亮度信号发送至显示装置的背光源。在本发明实施例中，可选地通过背光脉冲宽度调变值(PWM Duty)控制系统调整的。
如图4所示，得到视频帧的直方图值后，视频信号增强模块根据视频帧的直方图通过数据增强系统动态提升视频输入信号的数据电平将增强后的图像信号传输至液晶面板显示。具体地，如图4所示，通过动态提升视频输入信号的数据电平，可以将当前视频帧的直方图分布范围扩大。动态提升视频输入信号的数据电平可以通过现有的直方图均衡法(Histogram Equalization)对视频帧图像处理。具体地，直方图均衡化则通过使用累积函数对灰度值进行调整以实现对比度的增强。直方图均衡化是图像处理领域中利用图像直方图对对比度进行调整的方法。这种方法通常用来 增加许多图像的局部对比度，尤其是当图像的有用数据的对比度相当接近的时候。通过这种方法，亮度可以更好地在直方图上分布。这样就可以用于增强局部的对比度而不影响整体的对比度，直方图均衡化通过有效地扩展常用的亮度来实现这种功能。由图4中视频帧直方图增强前后的对比，可以明显看出，增强后的数据范围变广了，直方图的分布也变得更均匀了。而从是显示的画面上主观上可以看出画面对比度更高、层次感和景深变得更好。
如图5a所示，原始画面的功耗90瓦，画面对比度为74：1，图中最暗区域的亮度值为0.82nits，最亮区域的亮度区域的亮度值为60.6nits。如图5b所示，动态调整的画面的功耗为57瓦，画面的对比度为77：1，图中最暗区域的亮度值为0.52nits，最亮区域的亮度区域的亮度值为40.3nits。通过动态调整背光画面的方式虽然降低了功耗但是，同时损失了画面的亮度。如图5c所示，采用本发明实施例提供的显示装置图像处理方法和系统处理过的画面功耗为24瓦，画面对比度为275:1，图中最暗区域的亮度值为0.22nits，最亮区域的亮度区域的亮度值为60.6nits。通过本发明实施例提供的方法，在降低功耗的同时，不降低画面亮度，提高了画面的对比度。由此可知，本发明实施例在原有画面的基础上与传统动态调整背光的方式相比在降低工号的同时对画面清晰度有明显提升，画面对比度更高、层次感和景深变得更好。
本发明另一实施例还公开了一种计算机程序，包括程序代码，所述程序代码用于执行如下操作：
对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
本发明另一实施例还公开了一种存储介质，用于存储如前所述的计算机程序。
本发明实施例还公开了一种装置，该装置包括：
一个或多个处理器；
存储器；
一个或多个程序模块；
所述一个或多个程序模块存储在所述存储器中，当被所述一个或多个处理器执行时，进行如下操作：
对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
综上所述，本发明实施例提供的显示装置图像处理方法、系统、计算机程序、存储介质和装置，通过动态降低背光亮度，动态提升视频图像的数据电平，在降低功耗的同时提升了画面的对比度、景深和层次感，节能的同时又能很好的提升画质。
以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、 磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的实施例的技术方案，而非对其限制；尽管参照前述各实施例对本发明的实施例进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明的实施例各实施例技术方案的范围。

Claims (13)

  1. 一种显示装置图像处理方法，其特征在于，包括如下步骤：
    对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
    根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
    根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
  2. 根据权利要求1所述的显示装置图像处理方法，其特征在于，根据平均亮度值调整背光亮度包括：
    根据视频帧的平均亮度值与预先设置的亮度调整阈值THD的大小动态调整向背光源的亮度值信号。
  3. 根据权利要求2所述的显示装置图像处理方法，其特征在于，如果当前视频帧的平均亮度值大于等于预设的亮度调整阈值，则输出亮度值如下式所示：
    PWM＝100％   (APL≥THD)
    其中，PWM表示向背光源的亮度值；
    如果当前视频帧的平均亮度值小于预设的亮度调整阈值，则亮度值如下式所示：
    Figure PCTCN2016088653-appb-100001
    其中，PWM表示向背光源的亮度值，Base表示可接受的亮度值，APL表示当前视频帧的平均亮度值，THD表示预先设置的亮度调整阈值。
  4. 根据权利要求1所述的显示装置图像处理方法，其特征在于，所述视频帧图像的直方图和平均亮度值是通过影像分析系统 得到的。
  5. 根据权利要求1所述的显示装置图像处理方法，其特征在于，所述动态提升视频输入信号的数据电平是通过数据增强系统提升的。
  6. 根据权利要求1所述的显示装置图像处理方法，其特征在于，所述背光亮度是通过背光脉冲宽度调变值控制系统调整的。
  7. 根据权利要求1所述的显示装置图像处理方法，其特征在于，所述动态提升视频输入信号的数据电平是通过直方图均衡化得到的。
  8. 一种显示装置图像处理系统，其特征在于，包括：
    视频信号分析模块，用于对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
    背光亮度调整模块，用于根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
    视频信号增强模块，用于根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
  9. 根据权利要求8所述的显示装置图像处理系统，其特征在于，所述背光亮度调整模块还包括判断模块，
    所述判断模块用于根据视频帧的平均亮度值与预先设置的亮度调整阈值的大小动态调整向背光源的亮度值信号；
    如果当前视频帧的平均亮度值大于等于预设的亮度调整阈值，则输出亮度值如下式所示：
    PWM＝100％   (APL≥THD)
    其中，PWM表示向背光源的亮度值；
    如果当前视频帧的平均亮度值小于预设的亮度调整阈值，则亮度值如下式所示：
    Figure PCTCN2016088653-appb-100002
    其中，PWM表示向背光源的亮度值，Base表示可接受的亮度值，APL表示当前视频帧的平均亮度值，THD表示预先设置的亮度调整阈值。
  10. 根据权利要求8所述的显示装置图像处理系统，其特征在于，所述背光亮度是通过背光脉冲宽度调变值控制系统调整的。
  11. 一种计算机程序，其特征在于，包括程序代码，所述程序代码用于执行如下操作：
    对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
    根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
    根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
  12. 一种存储介质，其特性在与，用于存储如权利要求11所述的计算机程序。
  13. 一种装置，其特征在于，包括：
    一个或多个处理器；
    存储器；
    一个或多个程序模块；
    所述一个或多个程序模块存储在所述存储器中，当被所述一个或多个处理器执行时，进行如下操作：
    对视频输入信号分析得到视频帧图像的直方图和平均亮度值；
    根据平均亮度值调整背光亮度，并将调整后的亮度信号输出至背光源；
    根据所述直方图动态提升视频输入信号的数据电平，并将调整后的视频信号输出至液晶面板。
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