WO2017088483A1 - Procédé et système de traitement d'image de dispositif d'affichage, programme informatique, et support de stockage - Google Patents

Procédé et système de traitement d'image de dispositif d'affichage, programme informatique, et support de stockage 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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PCT/CN2016/088653
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English (en)
Chinese (zh)
Inventor
罗荣荣
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乐视控股（北京）有限公司
乐视致新电子科技（天津）有限公司
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Publication of WO2017088483A1 publication Critical patent/WO2017088483A1/fr

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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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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  • Signal Processing (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un procédé et un système de traitement d'image de dispositif d'affichage, un programme informatique, un support de stockage, et un dispositif. Le procédé comprend les étapes suivantes consistant à : analyser un signal d'entrée vidéo pour obtenir un histogramme et une valeur de luminosité moyenne d'une image de trame vidéo ; ajuster une luminosité de rétroéclairage d'après la valeur de luminosité moyenne et envoyer un signal de luminosité ajustée à une source de rétroéclairage ; et amplifier dynamiquement un niveau de données du signal d'entrée vidéo d'après l'histogramme, et envoyer le signal vidéo ajusté à un panneau d'affichage à cristaux liquides. La présente invention améliore le contraste, la profondeur de champ et la détection de couches d'une image, et réduit la consommation de puissance via la réduction dynamique d'une luminosité de rétroéclairage et l'amplification dynamique d'un niveau de données d'une image vidéo. Cela permet d'améliorer la qualité de l'image tout en économisant l'énergie.
PCT/CN2016/088653 2015-11-25 2016-07-05 Procédé et système de traitement d'image de dispositif d'affichage, programme informatique, et support de stockage WO2017088483A1 (fr)

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