WO2017113585A1 - 降低视频图像中osd亮度的方法和装置 - Google Patents

降低视频图像中osd亮度的方法和装置 Download PDF

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Publication number
WO2017113585A1
WO2017113585A1 PCT/CN2016/084198 CN2016084198W WO2017113585A1 WO 2017113585 A1 WO2017113585 A1 WO 2017113585A1 CN 2016084198 W CN2016084198 W CN 2016084198W WO 2017113585 A1 WO2017113585 A1 WO 2017113585A1
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Prior art keywords
osd
brightness
image frame
image
brightness value
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PCT/CN2016/084198
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English (en)
French (fr)
Inventor
杨福军
谢仁礼
张晓东
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深圳Tcl数字技术有限公司
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Publication of WO2017113585A1 publication Critical patent/WO2017113585A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/485—End-user interface for client configuration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/485—End-user interface for client configuration
    • H04N21/4854—End-user interface for client configuration for modifying image parameters, e.g. image brightness, contrast

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for reducing the brightness of an OSD in a video image.
  • High dynamic range The brightness of the TV or display screen is usually high, the maximum brightness of the full white field is generally 700-800 nit, and the peak brightness is up to 1000. Nit or more.
  • the peak value of the video signal appears white.
  • the video signal contains the OSD
  • the other is that the video signal contains the starlight, the light and the like.
  • the video signal contains less stars, light and other images, and the peak value of the peak white is less, and the peak white residence time is shorter, which will not adversely affect the human eye.
  • the video signal contains the OSD
  • the brightness peak of the OSD appears in the process of re-displaying the video.
  • the white peak stay time is longer. This long-term staying peak brightness white OSD will give a dazzling and dazzling feeling. Eye fatigue.
  • the prior art generally reduces the brightness of the OSD by adjusting the brightness of the video image.
  • this method achieves the purpose of reducing the brightness of the OSD, the brightness of the entire image is reduced, resulting in reduced image contrast and a user's visual experience.
  • the effect is deteriorated; that is, the prior art cannot realize the reduction of the display brightness of the OSD under the premise of keeping the image display brightness other than the OSD in the video signal, and ensuring the user to view the visual comfort.
  • the main object of the present invention is to solve the technical problem that the prior art cannot realize the display brightness of the OSD while maintaining the brightness of the image display other than the OSD in the video signal, and ensure the visual comfort of the user when watching the video program containing the OSD. .
  • the present invention provides a method for reducing the brightness of an OSD in a video image, and the method for reducing the brightness of an OSD in a video image includes:
  • the determining whether the image frame containing the OSD exists in the video signal specifically includes:
  • the determining the location and the brightness value corresponding to the OSD in the image frame specifically includes:
  • Determining a pixel point whose luminance value difference is equal to zero is an OSD corresponding pixel point
  • a position and a brightness value corresponding to the OSD in the image frame of each frame are determined according to the coordinate value and the brightness value.
  • the reducing the display brightness of the OSD in the image frame when the video signal is re-displayed according to the position and the brightness value corresponding to the OSD in the image frame comprises:
  • the reducing the display brightness of the OSD when the image frame is re-displayed according to the position and the brightness value corresponding to the OSD in the image frame comprises:
  • the present invention also provides a method for reducing the brightness of an OSD in a video image, the method for reducing the brightness of an OSD in a video image, including:
  • the reducing the display brightness of the OSD in the image frame when the video signal is re-displayed according to the position and the brightness value corresponding to the OSD in the image frame comprises:
  • the reducing the display brightness of the OSD when the image frame is re-displayed according to the position and the brightness value corresponding to the OSD in the image frame comprises:
  • the determining whether the image frame containing the OSD exists in the video signal specifically includes:
  • the multi-frame image in which the image content and the image luminance value are the same is an image frame including the OSD.
  • the determining the location and the brightness value corresponding to the OSD in the image frame specifically includes:
  • Determining a pixel point whose luminance value difference is equal to zero is an OSD corresponding pixel point
  • a position and a brightness value corresponding to the OSD in the image frame of each frame are determined according to the coordinate value and the brightness value.
  • the present invention also provides an apparatus for reducing the brightness of an OSD in a video image, the apparatus for reducing the brightness of an OSD in a video image, comprising:
  • a determining module configured to determine whether an image frame containing an OSD exists in the video signal
  • a determining module configured to determine an image and a brightness value corresponding to the OSD in the image frame when an image frame containing the OSD exists in the video signal
  • a brightness control module configured to reduce a display brightness of the OSD in the image frame when the video signal is redisplayed according to a position and a brightness value corresponding to the OSD in the image frame.
  • the brightness control module comprises:
  • a brightness control unit configured to determine, according to a position corresponding to the OSD in the image frame, each pixel point corresponding to the OSD in the image frame, and reduce a brightness value of each of the pixel points, before the video signal is redisplayed, A display brightness reduction of the OSD in the image frame when the video signal is reproduced is achieved.
  • the brightness control module comprises:
  • a first brightness control unit configured to determine, according to a location of the OSD in the image frame, a corresponding position of the OSD in the display backlight module in the image frame; determining, according to a brightness value of the OSD in the image frame, a display backlight module The LED backlight brightness value of the corresponding position; when the video signal is re-displayed, adjusting the brightness of the LED backlight in the display backlight module corresponding to the position of the OSD according to the LED backlight brightness value, thereby reducing the video The display brightness of the OSD in the image frame when the signal is reproduced.
  • the determining module is specifically configured to determine whether the image content exists in the video signal, the image brightness values are the same, and the multi-frame image in which the time sequence is connected is re-displayed; if yes, the image content and the image brightness value are determined.
  • the same multi-frame image is an image frame containing an OSD.
  • the determining module is specifically configured to calculate a brightness value of each pixel in each image frame of each frame; and compare a brightness value of each pixel point with a brightness value of a pixel position corresponding to the adjacent image frame; Determining a pixel point whose luminance value difference is equal to zero is an OSD corresponding pixel point; acquiring coordinate values and luminance values of each OSD corresponding pixel point in the image frame of each frame; determining the image frame per frame according to the coordinate value and the brightness value The position and brightness value corresponding to the medium OSD.
  • the method and apparatus for reducing the brightness of an OSD in a video image provided by the present invention, by determining whether an image frame containing an OSD exists in a video signal; and determining an OSD in the image frame when an image frame containing an OSD exists in the video signal Corresponding position and brightness values; according to the position and brightness value corresponding to the OSD in the image frame, the manner of reducing the display brightness of the OSD in the image frame when the video signal is re-displayed can be implemented in addition to the OSD in the video signal
  • the image display brightness is unchanged, the display brightness of the OSD is lowered, and the visual comfort of the user watching the video program containing the OSD is ensured, thereby improving the visual experience of the user.
  • FIG. 1 is a schematic flow chart of an embodiment of a method for reducing brightness of an OSD in a video image according to the present invention
  • FIG. 2 is a schematic diagram showing a specific refinement process of reducing the display brightness of the OSD when the image frame is redisplayed according to the position and the brightness value corresponding to the OSD in the image frame in step S30 of FIG. 1;
  • FIG. 3 is a schematic diagram of functional modules of an apparatus for reducing brightness of an OSD in a video image according to the present invention
  • FIG. 4 is a schematic diagram of a specific refinement function module of the brightness control module of FIG. 3;
  • FIG. 5 is a schematic diagram of another specific refinement function module of the brightness control module of FIG. 3;
  • FIG. 5 is a schematic diagram of another specific refinement function module of the brightness control module of FIG. 3;
  • FIG. 6 is a schematic diagram of still another specific refinement function module of the brightness control module of FIG. 3.
  • FIG. 1 is a schematic flow chart of a method for reducing the brightness of an OSD in a video image according to an embodiment of the present invention.
  • the method for reducing the brightness of the OSD in the video image includes:
  • Step S10 Determine whether an image frame containing an OSD exists in the video signal.
  • the step S10 is specifically processed as follows: determining whether there is image content in the video signal, the image brightness values are the same, and the multi-frame images are connected in time series; if yes, determining that the image content and the image brightness values are the same multiple frames
  • the image is an image frame containing an OSD.
  • the image content and the brightness value of the position of the OSD are consistent in the multi-frame image including the OSD; and the multi-frame image is sequentially connected in the re-display time. Therefore, in this embodiment, by calculating the luminance difference value of the corresponding pixel point in the adjacent image frame, if the luminance difference of the pixel position of the corresponding position in the adjacent multiple frame image frame is always zero, it can be determined that the adjacent multi-frame image frame is Contains OSD, that is, the video signal contains OSD content.
  • the multi-frame image may be a few frames of images, or a dozen frames of images, or even tens of frames of images.
  • Step S20 When an image frame containing an OSD exists in the video signal, determine a position and a brightness value corresponding to the OSD in the image frame.
  • the step S20 specifically includes the following steps: calculating a luminance value of each pixel in the image frame of each frame; comparing a luminance value of each pixel with a luminance value of a pixel corresponding to a position of the adjacent image frame; determining a luminance value a pixel point with a difference equal to zero is an OSD corresponding pixel point; acquiring a coordinate value and a brightness value of each OSD corresponding pixel point in the image frame of each frame; determining an OSD corresponding to the image frame in each frame according to the coordinate value and the brightness value Position and brightness values.
  • Step S30 Decrease a display brightness of the OSD in the image frame when the video signal is redisplayed according to a position and a brightness value corresponding to the OSD in the image frame.
  • the step S30 described in the present invention includes the following two processing modes:
  • the first processing mode is: before the video signal is re-displayed, determining, according to the position corresponding to the OSD in the image frame, each pixel point corresponding to the OSD in the image frame, and reducing the brightness value of each pixel point. And reducing the display brightness of the OSD in the image frame when the video signal is reproduced.
  • an OSD brightness threshold is preset; the decreasing the brightness value of each pixel is specifically: reducing the brightness value of each pixel to be equal to the OSD brightness threshold.
  • the preset OSD brightness threshold may be set according to the actual needs of the user, and the human eye feels comfortable after the image frame is re-displayed.
  • FIG. 2 is a schematic diagram of a specific refinement process of step S30 in FIG.
  • the step S30 specifically includes:
  • Step S31 Determine, according to the location of the OSD in the image frame, a corresponding position of the OSD in the image backlight frame in the display backlight module.
  • Step S32 Determine, according to the brightness value of the OSD in the image frame, an LED backlight brightness value of the corresponding position in the backlight module of the display.
  • the LED backlight brightness value of the corresponding position in the display backlight module needs to be determined according to the brightness value of the OSD in the image frame. In general, the greater the OSD brightness value, the greater the brightness value of the LED backlight corresponding to the position in the backlight module of the display, and vice versa.
  • step S33 when the video signal is re-displayed, the brightness of the LED backlight in the backlight module corresponding to the OSD is adjusted according to the brightness value of the LED backlight, so as to reduce the image when the video signal is re-displayed.
  • the display brightness of the OSD in the frame is adjusted according to the brightness value of the LED backlight, so as to reduce the image when the video signal is re-displayed.
  • the method for adjusting the brightness of the LED backlight in the display backlight module corresponding to the position of the OSD is: reducing the magnitude of the driving current of the LED or changing the duty ratio of the driving current.
  • the step S30 in the present invention may adopt the first mode or the second mode, or may be used in combination.
  • the OSD described in the above embodiment includes: an OSD character and an OSD graphic.
  • the method for reducing the brightness of the OSD in the video image provided by the above embodiment, by determining whether there is an image frame containing the OSD in the video signal; when there is an image frame containing the OSD in the video signal, determining the OSD corresponding to the image frame Position and brightness value; according to the position and brightness value corresponding to the OSD in the image frame, the manner of reducing the display brightness of the OSD in the image frame when the video signal is re-displayed can be realized in addition to the OSD in the video signal Under the premise that the brightness of the image is unchanged, the display brightness of the OSD is lowered, and the visual comfort of the user watching the video program containing the OSD is ensured, thereby improving the visual experience of the user.
  • FIG. 3 is a schematic diagram of functional blocks of an apparatus for reducing the brightness of an OSD in a video image according to an embodiment of the present invention.
  • the apparatus 100 for reducing the brightness of the OSD in the video image includes: the determining module 110 The determining module 120 and the brightness control module 130. among them,
  • the determining module 110 is configured to determine whether an image frame containing the OSD exists in the video signal
  • a determining module 120 configured to: when an image frame containing an OSD exists in the video signal, determine
  • the brightness control module 130 is configured to reduce a display brightness of the OSD in the image frame when the video signal is redisplayed according to a position and a brightness value corresponding to the OSD in the image frame.
  • the determining module 110 is specifically configured to determine whether the image content exists in the video signal, the image brightness values are the same, and the multi-frame image in which the time sequence is connected is re-displayed; if yes, the image content and the image brightness value are determined.
  • the same multi-frame image is an image frame containing an OSD.
  • the image content and the brightness value of the position of the OSD are consistent in the multi-frame image including the OSD; and the multi-frame image is sequentially connected in the reproduction time. Therefore, in this embodiment, by calculating the luminance difference value of the corresponding pixel point in the adjacent image frame, if the luminance difference of the pixel position of the corresponding position in the adjacent multiple frame image frame is always zero, it can be determined that the adjacent multi-frame image frame is Contains OSD, that is, the video signal contains OSD content.
  • the multi-frame image may be a few frames of images, or a dozen frames of images, or even tens of frames of images.
  • the determining module 120 is specifically configured to calculate a brightness value of each pixel in each image frame of each frame; and compare the brightness value of each pixel point with the brightness value of the corresponding pixel position of the adjacent image frame. Determining a pixel point whose luminance value difference is equal to zero is an OSD corresponding pixel point; acquiring coordinate values and luminance values of each OSD corresponding pixel point in the image frame of each frame; determining the image of each frame according to the coordinate value and the brightness value; The position and brightness value corresponding to the OSD in the frame.
  • FIG. 4 is a schematic diagram of a specific refinement function module of the brightness control module 130 of FIG.
  • the brightness control module 130 in the above embodiment includes a brightness control unit 131, and the brightness control unit 131 determines an OSD corresponding to the image frame according to a position corresponding to the OSD in the image frame before the video signal is reproduced. Each pixel point reduces the brightness value of each pixel point to reduce the display brightness of the OSD in the image frame when the video signal is redisplayed.
  • the embodiment has an OSD brightness threshold set in advance; the brightness control unit 131 decreases the brightness value of each pixel specifically by reducing the brightness value of each pixel point to be equal to the OSD brightness threshold.
  • the preset OSD brightness threshold may be set according to the actual needs of the user, and the human eye feels comfortable after the image frame is re-displayed.
  • FIG. 5 is a schematic diagram of another specific refinement function module of the brightness control module of FIG.
  • the adjustment is that the brightness control module 130 includes a first brightness control unit 132. That is, the first brightness control unit 132 replaces the brightness control unit 131.
  • the first brightness control unit 32 is configured to determine, according to a position of the OSD in the image frame, a corresponding position of the OSD in the display backlight module in the image frame; and determine a display according to the brightness value of the OSD in the image frame.
  • the LED backlight brightness value of the corresponding position in the backlight module when the video signal is reproduced, adjusting the brightness of the LED backlight in the backlight module of the display corresponding to the position of the OSD according to the LED backlight brightness value, thereby achieving reduction
  • the LED backlight brightness value of the corresponding position in the display backlight module needs to be determined according to the brightness value of the OSD in the image frame. In general, the greater the OSD brightness value, the greater the brightness value of the LED backlight corresponding to the position in the backlight module of the display, and vice versa.
  • the first brightness control unit 32 adjusts the brightness of the LED backlight in the display backlight module corresponding to the position corresponding to the OSD to reduce the driving current of the LED or change the duty ratio of the driving current.
  • FIG. 6 is another specific embodiment of the brightness control module of FIG. Refine the schematic diagram of the function module.
  • the adjustment is: in the embodiment, the brightness control module 130 includes: a brightness control unit 131 and a first brightness control unit 132.
  • the brightness control unit 131 and the first brightness control unit 132 of the present embodiment are respectively the brightness control unit 131 and the first brightness control unit 132 described in the above embodiments, and will not be described in detail herein.
  • the OSD described in the above embodiments includes: an OSD character and an OSD graphic.
  • the apparatus 100 for reducing the brightness of the OSD in the video image determines whether there is an image frame containing the OSD in the video signal; when there is an image frame containing the OSD in the video signal, determining the image frame The position and brightness value corresponding to the OSD; according to the position and brightness value corresponding to the OSD in the image frame, the manner of reducing the display brightness of the OSD in the image frame when the video signal is re-displayed can achieve the OSD in the video signal Under the premise that the brightness of the image is unchanged, the display brightness of the OSD is lowered, and the visual comfort of the user watching the video program containing the OSD is ensured, thereby improving the visual experience of the user.

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  • Multimedia (AREA)
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Abstract

本发明公开了一种降低视频图像中OSD亮度的方法，方法为：所述降低视频图像中OSD亮度的方法包括：判断视频信号中是否存在含有OSD的图像帧；当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；以及根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度。本发明还公开了一种降低视频图像中OSD亮度的装置。本发明所提供的降低视频图像中OSD亮度的方法和装置，能够实现在保持视频信号中OSD以外的图像显示亮度不变的前提下，降低OSD的显示亮度，确保了用户观看含有OSD的视频节目时视觉舒适度，提升了用户视觉体验效果。

Description

降低视频图像中OSD亮度的方法和装置
技术领域
本发明涉及通讯技术领域，尤其涉及一种降低视频图像中OSD亮度的方法和装置。
背景技术
通过TFT LCD电视播放蓝光DVD电影或其它电视节目时，通常会有黑底白字的OSD（on-screen display）对白出现。这种黑底白字的OSD的峰值亮度一般对应屏幕的最大亮度。
高动态范围(HDR) 电视机或显示器屏幕亮度通常较高，全白场最大亮度一般达到700-800nit，峰值亮度可达1000 nit以上。视频信号出现亮度峰值白的场景一般包括两种，一种是视频信号中包含OSD，另一种是视频信号中包含星光、灯光等图像。其中视频信号中因含星光、灯光等图像而出现亮度峰值白的次数较少、峰值白停留时间较短，不会对人眼产生不良影响。但若视频信号中包含OSD，则重显视频过程中因OSD出现的亮度峰值白停留时间较长，这种长时间停留的亮度峰值白OSD会给人刺眼、炫目的感觉，长时间观看易造成眼睛疲劳。
针对上述问题现有技术一般通过调节降低视频图像亮度的方式实现降低OSD亮度，这种方式虽然达到降低OSD亮度的目的，但由于整幅图像亮度都降低了，造成图像对比度降低，用户的视觉体验效果变差；即现有技术无法实现在保持视频信号中OSD以外的图像显示亮度不变的前提下，降低OSD的显示亮度，确保用户观看视觉舒适度。
发明内容
本发明的主要目的在于解决现有技术无法实现在保持视频信号中OSD以外的图像显示亮度不变的前提下，降低OSD的显示亮度，确保用户观看含有OSD的视频节目时视觉舒适度的技术问题。
为实现上述目的，本发明提供的一种降低视频图像中OSD亮度的方法，所述降低视频图像中OSD亮度的方法包括：
判断视频信号中是否存在含有OSD的图像帧；
当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；
根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度；其中，
所述判断视频信号中是否存在含有OSD的图像帧具体包括：
判断视频信号中是否存在图像内容、图像亮度值均相同，重显时间顺序相连的多帧图像；
若存在，则确定所述图像内容、图像亮度值均相同的多帧图像为含有OSD的图像帧；
所述确定所述图像帧中OSD对应的位置和亮度值具体包括：
计算每帧所述图像帧中每个像素点的亮度值；将每个像素点的亮度值与相邻图像帧对应位置像素点的亮度值进行比较；
确定亮度值差等于零的像素点为OSD对应像素点；
获取每帧所述图像帧中每个OSD对应像素点的坐标值和亮度值；
根据所述坐标值和亮度值确定每帧所述图像帧中OSD对应的位置和亮度值。
优选地，所述根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度具体包括：
在所述视频信号重显之前，根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
优选地，所述根据所述图像帧中OSD对应的位置和亮度值，降低所述图像帧重显时OSD的显示亮度具体包括：
根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；
根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；
在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
为实现上述目的，本发明还提供一种降低视频图像中OSD亮度的方法，所述降低视频图像中OSD亮度的方法包括：
判断视频信号中是否存在含有OSD的图像帧；
当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；以及
根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度。
优选地，所述根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度具体包括：
在所述视频信号重显之前，根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
优选地，所述根据所述图像帧中OSD对应的位置和亮度值，降低所述图像帧重显时OSD的显示亮度具体包括：
根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；
根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；
在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
优选地，所述判断视频信号中是否存在含有OSD的图像帧具体包括：
判断视频信号中是否存在图像内容、图像亮度值均相同，重显时间顺序相连的多帧图像；
若存在，则确定所述图像内容、图像亮度值均相同的多帧图像为含有OSD的图像帧。
优选地，所述确定所述图像帧中OSD对应的位置和亮度值具体包括：
计算每帧所述图像帧中每个像素点的亮度值；将每个像素点的亮度值与相邻图像帧对应位置像素点的亮度值进行比较；
确定亮度值差等于零的像素点为OSD对应像素点；
获取每帧所述图像帧中每个OSD对应像素点的坐标值和亮度值；
根据所述坐标值和亮度值确定每帧所述图像帧中OSD对应的位置和亮度值。
为实现上述目的，本发明还提供一种降低视频图像中OSD亮度的装置，所述降低视频图像中OSD亮度的装置包括：
判断模块，用于判断视频信号中是否存在含有OSD的图像帧；
确定模块，用于当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；
亮度控制模块，用于根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度。
优选地，所述亮度控制模块包括：
亮度控制单元，用于在所述视频信号重显之前根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
优选地，所述亮度控制模块包括：
第一亮度控制单元，用于根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
优选地，所述判断模块，具体用于判断视频信号中是否存在图像内容、图像亮度值均相同，重显时间顺序相连的多帧图像；若存在，则确定所述图像内容、图像亮度值均相同的多帧图像为含有OSD的图像帧。
优选地，所述确定模块，具体用于计算每帧所述图像帧中每个像素点的亮度值；将每个像素点的亮度值与相邻图像帧对应位置像素点的亮度值进行比较；确定亮度值差等于零的像素点为OSD对应像素点；获取每帧所述图像帧中每个OSD对应像素点的坐标值和亮度值；根据所述坐标值和亮度值确定每帧所述图像帧中OSD对应的位置和亮度值。
本发明所提供的降低视频图像中OSD亮度的方法和装置，通过判断视频信号中是否存在含有OSD的图像帧；当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度的方式，能够实现在保持视频信号中OSD以外的图像显示亮度不变的前提下，降低OSD的显示亮度，确保了用户观看含有OSD的视频节目时视觉舒适度，提升了用户视觉体验效果。
附图说明
图1为本发明的降低视频图像中OSD亮度的方法一实施例的流程示意图；
图2为图1中步骤S30根据所述图像帧中OSD对应的位置和亮度值，降低所述图像帧重显时OSD的显示亮度具体细化流程示意图；
图3为本发明的降低视频图像中OSD亮度的装置一实施例的功能模块示意图；
图4为图3中亮度控制模块的具体细化功能模块示意图；
图5为图3中亮度控制模块的另一具体细化功能模块示意图；
图6为图3中亮度控制模块的又一具体细化功能模块示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
以下结合说明书附图对本发明的优选实施例进行说明，应当理解，此处所描述的优选实施例仅用于说明和解释本发明，并不用于限定本发明，并且在不冲突的情况下，本发明中的实施例及实施例中的特征可以相互组合。
本发明提供一种降低视频图像中OSD亮度的方法。参照图1，图1为本发明的降低视频图像中OSD亮度的方法一实施例的流程示意图。在本实施例中，所述降低视频图像中OSD亮度的方法包括：
步骤S10、判断视频信号中是否存在含有OSD的图像帧。
本步骤S10具体处理如下：判断视频信号中是否存在图像内容、图像亮度值均相同、重显时间顺序相连的多帧图像；若存在，则确定所述图像内容、图像亮度值均相同的多帧图像为含有OSD的图像帧。
一般地，若某一视频信号含有OSD，则含有该OSD的多帧图像中，OSD所处位置的图像内容、亮度值均保持一致；且该多帧图像在重显时间上是顺序相连的。因此本实施例通过计算相邻图像帧中相应像素点的亮度差值，如果依次相邻多帧图像帧中相应位置的像素点亮度差始终为零，则可判断该相邻多帧图像帧均含有OSD，即视频信号中含有OSD内容。其中所述多帧图像可能是几帧图像、或十几帧图像、甚至数十帧图像。
步骤S20、当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值。
本步骤S20具体包括如下处理：计算每帧所述图像帧中每个像素点的亮度值；将每个像素点的亮度值与相邻图像帧对应位置像素点的亮度值进行比较；确定亮度值差等于零的像素点为OSD对应像素点；获取每帧所述图像帧中每个OSD对应像素点的坐标值和亮度值；根据所述坐标值和亮度值确定每帧所述图像帧中OSD对应的位置和亮度值。
步骤S30、根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度。
本发明中所述步骤S30包括以下两种处理方式：
第一种处理方式：在所述视频信号重显之前，根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
针对第一种处理方式，预先设置有OSD亮度阈值；所述降低每个像素点的亮度值具体为：将每个像素点的亮度值降低至与所述OSD亮度阈值相等。所述预设的OSD亮度阈值可以根据用户的实际需要进行设置，以图像帧重显后人眼感觉舒适为准。
第二种处理方式：参见图2，图2为图1中步骤S30的具体细化流程示意图。所述步骤S30具体包括：
步骤S31、根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置。
步骤S32、根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值。
一般地，当图像帧中OSD的亮度值过大，在重显所述视频信号时，如果降低显示器背光模块与相应图像帧中OSD对应位置的LED背光亮度值，能够降低相应图像帧中OSD的显示亮度。本步骤S32中，显示器背光模块中所述对应位置的LED背光亮度值需要根据图像帧中OSD的亮度值确定。一般地，OSD亮度值越大，则显示器背光模块中对应位置的LED背光需要降低的亮度值越大，反之亦然。
步骤S33、在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
其中调整显示器背光模块中与所述OSD对应位置的LED背光亮度的方法为：降低所述LED的驱动电流的大小或改变驱动电流的占空比。
本发明中所述步骤S30可以采用第一种方式或者第二种方式，也可以两种方式并用。
以上实施例中所述OSD包括：OSD字符和OSD图形。
以上实施例所提供的降低视频图像中OSD亮度的方法，通过判断视频信号中是否存在含有OSD的图像帧；当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度的方式，能够实现在保持视频信号中OSD以外的图像显示亮度不变的前提下，降低OSD的显示亮度，确保了用户观看含有OSD的视频节目时视觉舒适度，提升了用户视觉体验效果。
本发明进一步提供一种降低视频图像中OSD亮度的装置。参照图3，图3为本发明的降低视频图像中OSD亮度的装置一实施例的功能模块示意图。在本实施例中，该降低视频图像中OSD亮度的装置100包括：判断模块110 、确定模块120、亮度控制模块130。其中，
判断模块110，用于判断视频信号中是否存在含有OSD的图像帧；
确定模块120，用于当所述视频信号中存在含有OSD的图像帧，则确定
所述图像帧中OSD对应的位置和亮度值；
亮度控制模块130，用于根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度。
上述实施例中，判断模块110，具体用于判断视频信号中是否存在图像内容、图像亮度值均相同，重显时间顺序相连的多帧图像；若存在，则确定所述图像内容、图像亮度值均相同的多帧图像为含有OSD的图像帧。
一般地，若某一视频信号含有OSD，则含有该OSD的多帧图像中，OSD所在位置的图像内容、亮度值保持一致；且该多帧图像在重显时间上是顺序相连的。因此本实施例通过计算相邻图像帧中相应像素点的亮度差值，如果依次相邻多帧图像帧中相应位置的像素点亮度差始终为零，则可判断该相邻多帧图像帧均含有OSD，即视频信号中含有OSD内容。其中所述多帧图像可能是几帧图像、或十几帧图像、甚至数十帧图像。
上述实施例中，确定模块120，具体用于计算每帧所述图像帧中每个像素点的亮度值；将每个像素点的亮度值与相邻图像帧对应位置像素点的亮度值进行比较；确定亮度值差等于零的像素点为OSD对应像素点；获取每帧所述图像帧中每个OSD对应像素点的坐标值和亮度值；根据所述坐标值和亮度值确定每帧所述图像帧中OSD对应的位置和亮度值。
参见图4，图4为图3中亮度控制模块130的具体细化功能模块示意图。上述实施例中所述亮度控制模块130包括亮度控制单元131，所述亮度控制单元131，在所述视频信号重显之前根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
本实施例预先设置有OSD亮度阈值；所述亮度控制单元131降低每个像素点的亮度值具体为：将每个像素点的亮度值降低至与所述OSD亮度阈值相等。所述预设的OSD亮度阈值可以根据用户的实际需要进行设置，以图像帧重显后人眼感觉舒适为准。
本发明另一实施例提出另一降低视频图像中OSD亮度的装置，该实施例在上述实施例的基础上进行了调整， 参见图5，图5为图3中亮度控制模块的另一具体细化功能模块示意图。调整之处在于：所述亮度控制模块130包括第一亮度控制单元132。即所述第一亮度控制单元132替换所述亮度控制单元131。
所述第一亮度控制单元32，用于根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
一般地，当图像帧中OSD的亮度值过大，在重显所述视频信号时，如果降低显示器背光模块与相应图像帧中OSD对应位置的LED背光亮度，能够降低相应图像帧中OSD的显示亮度。本实施例中显示器背光模块中所述对应位置的LED背光亮度值需要根据图像帧中OSD的亮度值确定。一般地，OSD亮度值越大，则显示器背光模块中对应位置的LED背光需要降低的亮度值越大，反之亦然。
本实施例中所述第一亮度控制单元32调整显示器背光模块中与所述OSD对白对应位置的LED背光亮度的方法为：降低所述LED的驱动电流的大小或改变驱动电流的占空比。
本发明另一实施例提供了又一降低视频图像中OSD亮度的装置，该实施例在上述实施例的基础上进行了调整，参见图6，图6为图3中亮度控制模块的又一具体细化功能模块示意图。调整之处在于：在本实施例中，所述亮度控制模块130包括：亮度控制单元131和第一亮度控制单元132。其中本实施例的亮度控制单元131、第一亮度控制单元132分别为上述实施例中所述的亮度控制单元131和第一亮度控制单元132，在此不再对其进行详细的描述。
以上各实施例中所述OSD包括：OSD字符和OSD图形。
以上各实施例所提供的降低视频图像中OSD亮度的装置100，通过判断视频信号中是否存在含有OSD的图像帧；当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度的方式，能够实现在保持视频信号中OSD以外的图像显示亮度不变的前提下，降低OSD的显示亮度，确保了用户观看含有OSD的视频节目时视觉舒适度，提升了用户视觉体验效果。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (17)

  1. 一种降低视频图像中OSD亮度的方法，其特征在于，所述降低视频图像中OSD亮度的方法包括：
    判断视频信号中是否存在含有OSD的图像帧；
    当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；
    根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度；其中，
    所述判断视频信号中是否存在含有OSD的图像帧具体包括：
    判断视频信号中是否存在图像内容、图像亮度值均相同，重显时间顺序相连的多帧图像；
    若存在，则确定所述图像内容、图像亮度值均相同的多帧图像为含有OSD的图像帧；
    所述确定所述图像帧中OSD对应的位置和亮度值具体包括：
    计算每帧所述图像帧中每个像素点的亮度值；将每个像素点的亮度值与相邻图像帧对应位置像素点的亮度值进行比较；
    确定亮度值差等于零的像素点为OSD对应像素点；
    获取每帧所述图像帧中每个OSD对应像素点的坐标值和亮度值；
    根据所述坐标值和亮度值确定每帧所述图像帧中OSD对应的位置和亮度值。
  2. 根据权利要求1所述的降低视频图像中OSD亮度的方法，其特征在于，所述根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度具体包括：
    在所述视频信号重显之前，根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  3. 根据权利要求1所述的降低视频图像中OSD亮度的方法，其特征在于，所述根据所述图像帧中OSD对应的位置和亮度值，降低所述图像帧重显时OSD的显示亮度具体包括：
    根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；
    根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；
    在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  4. 一种降低视频图像中OSD亮度的方法，其特征在于，所述降低视频图像中OSD亮度的方法包括：
    判断视频信号中是否存在含有OSD的图像帧；
    当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；以及
    根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  5. 根据权利要求4所述的降低视频图像中OSD亮度的方法，其特征在于，所述根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度具体包括：
    在所述视频信号重显之前，根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  6. 根据权利要求4所述的降低视频图像中OSD亮度的方法，其特征在于，所述根据所述图像帧中OSD对应的位置和亮度值，降低所述图像帧重显时OSD的显示亮度具体包括：
    根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；
    根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；
    在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  7. 根据权利要求4所述的降低视频图像中OSD亮度的方法，其特征在于，所述判断视频信号中是否存在含有OSD的图像帧具体包括：
    判断视频信号中是否存在图像内容、图像亮度值均相同，重显时间顺序相连的多帧图像；
    若存在，则确定所述图像内容、图像亮度值均相同的多帧图像为含有OSD的图像帧。
  8. 根据权利要求4所述的降低视频图像中OSD亮度的方法，其特征在于，所述确定所述图像帧中OSD对应的位置和亮度值具体包括：
    计算每帧所述图像帧中每个像素点的亮度值；将每个像素点的亮度值与相邻图像帧对应位置像素点的亮度值进行比较；
    确定亮度值差等于零的像素点为OSD对应像素点；
    获取每帧所述图像帧中每个OSD对应像素点的坐标值和亮度值；
    根据所述坐标值和亮度值确定每帧所述图像帧中OSD对应的位置和亮度值。
  9. 一种降低视频图像中OSD亮度的装置，其特征在于，所述降低视频图像中OSD亮度的装置包括：
    判断模块，用于判断视频信号中是否存在含有OSD的图像帧；
    确定模块，用于当所述视频信号中存在含有OSD的图像帧，则确定所述图像帧中OSD对应的位置和亮度值；
    亮度控制模块，用于根据所述图像帧中OSD对应的位置和亮度值，降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  10. 根据权利要求9所述的降低视频图像中OSD亮度的装置，其特征在于，所述亮度控制模块包括：
    亮度控制单元，用于在所述视频信号重显之前根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  11. 根据权利要求9所述的降低视频图像中OSD亮度的装置，其特征在于，所述亮度控制模块包括：
    第一亮度控制单元，用于根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  12. 根据权利要求9所述的降低视频图像中OSD亮度的装置，其特征在于，
    所述判断模块，具体用于判断视频信号中是否存在图像内容、图像亮度值均相同，重显时间顺序相连的多帧图像；若存在，则确定所述图像内容、图像亮度值均相同的多帧图像为含有OSD的图像帧。
  13. 根据权利要求12所述的降低视频图像中OSD亮度的装置，其特征在于，所述亮度控制模块包括：
    亮度控制单元，用于在所述视频信号重显之前根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  14. 根据权利要求12所述的降低视频图像中OSD亮度的装置，其特征在于，所述亮度控制模块包括：
    第一亮度控制单元，用于根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  15. 根据权利要求9所述的降低视频图像中OSD亮度的装置，其特征在于，
    所述确定模块，具体用于计算每帧所述图像帧中每个像素点的亮度值；将每个像素点的亮度值与相邻图像帧对应位置像素点的亮度值进行比较；确定亮度值差等于零的像素点为OSD对应像素点；获取每帧所述图像帧中每个OSD对应像素点的坐标值和亮度值；根据所述坐标值和亮度值确定每帧所述图像帧中OSD对应的位置和亮度值。
  16. 根据权利要求15所述的降低视频图像中OSD亮度的装置，其特征在于，所述亮度控制模块包括：
    亮度控制单元，用于在所述视频信号重显之前根据所述图像帧中OSD对应的位置，确定所述图像帧中OSD对应的每个像素点，降低所述每个像素点的亮度值，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
  17. 根据权利要求15所述的降低视频图像中OSD亮度的装置，其特征在于，所述亮度控制模块包括：
    第一亮度控制单元，用于根据所述图像帧中OSD的位置，确定所述图像帧中OSD在显示器背光模块中的对应位置；根据所述图像帧中OSD的亮度值，确定显示器背光模块中所述对应位置的LED背光亮度值；在重显所述视频信号时，根据所述LED背光亮度值，调整所述显示器背光模块中与所述OSD对应位置的LED背光亮度，实现降低所述视频信号重显时所述图像帧中OSD的显示亮度。
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