CN112218156A

CN112218156A - Method for adjusting video dynamic contrast and display equipment

Info

Publication number: CN112218156A
Application number: CN202011070759.9A
Authority: CN
Inventors: 王彬
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-01-12
Anticipated expiration: 2040-10-09
Also published as: CN112218156B

Abstract

The application discloses a method for adjusting video dynamic contrast and display equipment, which are used for solving the problem of flicker caused by abnormal display time stamps of individual video frames due to soft decoding under the condition of not reducing the threshold value of the whole video dynamic contrast and realizing smooth transition of video image brightness. The method comprises the following steps: soft decoding the played video to obtain video information, wherein the video information comprises a display time stamp of a video frame; if the video frame which is not played is detected to be an abnormal frame, comparing the average brightness of the abnormal frame with the average brightness of the video frame which is before the abnormal frame, wherein the abnormal frame comprises the video frame with abnormal display timestamp; and according to the comparison result, adjusting the dynamic contrast when the abnormal frame is played.

Description

Method for adjusting video dynamic contrast and display equipment

Technical Field

The present application relates to the field of display technologies, and in particular, to a method for adjusting video dynamic contrast and a display device.

Background

With the popularization of smart televisions and the popularity of network video playing platforms, television users use different network video playing platforms or application programs. In the process of playing videos by such video playing platforms or application programs, a flickering phenomenon caused by abnormal display timestamps of individual video frames due to soft decoding often occurs, and the experience is poor.

The display timestamp is abnormal, namely, the display timestamp is suddenly increased due to the problem of recording equipment; or because the writing time stamp is not monotonically increased at the time of encoding, the display time stamp becomes suddenly large. Such display timestamp anomalies occur in the network playback platform or application soft decoding.

The flicker problem in the previous video playing process, which is more common, is usually improved by reducing the dynamic contrast level value of the whole video, for example: and the network playing platform or the application program closes the dynamic contrast when the video is started or sets the dynamic contrast level value of the whole video as the lowest level of opening. The method reduces the dynamic contrast of the whole video, and influences the image quality effect of the whole video.

Disclosure of Invention

The embodiment of the application provides a method for adjusting video dynamic contrast and display equipment, which are used for solving the problem of flicker caused by abnormal display time stamps of individual video frames due to soft decoding under the condition of not reducing the threshold value of the whole video dynamic contrast and realizing smooth transition of video image brightness.

In a first aspect, a display device includes:

a display;

a controller for performing:

soft decoding the played video to obtain video information, wherein the video information comprises a display time stamp of a video frame;

if the video frame which is not played is detected to be an abnormal frame, comparing the average brightness of the abnormal frame with the average brightness of the video frame which is before the abnormal frame, wherein the abnormal frame comprises the video frame with abnormal display timestamp;

and according to the comparison result, adjusting the dynamic contrast when the abnormal frame is played.

In some embodiments, the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

if the average brightness of the abnormal frame is larger than that of the previous video frame, reducing the dynamic contrast when the abnormal frame is played;

if the average brightness of the abnormal frame is smaller than the average brightness of the previous video frame, increasing the dynamic contrast when the abnormal frame is played;

if the average brightness of the abnormal frame is equal to the average brightness of the previous video frame, the dynamic contrast ratio is kept unchanged when the abnormal frame is played.

if the average brightness of the previous video frame is within a first preset brightness range and the difference value between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a first preset difference value range, the dynamic contrast ratio is kept unchanged when the abnormal frame is played.

and if the average brightness of the previous video frame is within a first preset brightness range, the average brightness of the abnormal frame is greater than the average brightness of the previous video frame, and the difference value between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a second preset difference value range, the dynamic contrast is reduced by a first preset value when the abnormal frame is played.

and if the average brightness of the previous video frame is within a first preset brightness range, the average brightness of the abnormal frame is smaller than the average brightness of the previous video frame, and the difference value between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a second preset difference value range, the dynamic contrast is increased by a first preset value when the abnormal frame is played.

and if the average brightness of the previous video frame is within a first preset brightness range, the average brightness of the abnormal frame is greater than the average brightness of the previous video frame, and the difference value between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a third preset difference value range, the dynamic contrast is reduced by a second preset value when the abnormal frame is played.

and if the average brightness of the previous video frame is within a first preset brightness range, the average brightness of the abnormal frame is smaller than the average brightness of the previous video frame, and the difference value between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a third preset difference value range, increasing a second preset value to the dynamic contrast when the abnormal frame is played.

and if the average brightness of the previous video frame is within a second preset range and the difference value between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a fourth preset difference value range, the dynamic contrast ratio is kept unchanged when the abnormal frame is played.

and if the average brightness of the previous video frame is within a second preset range, the average brightness of the abnormal frame is greater than the average brightness of the previous video frame, and the difference value between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a fifth preset difference value range, the dynamic contrast is reduced by a first preset value when the abnormal frame is played.

and if the average brightness of the previous video frame is within a second preset range, the average brightness of the abnormal frame is smaller than the average brightness of the previous video frame, and the difference value between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a fifth preset difference value range, the dynamic contrast is increased by a first preset value when the abnormal frame is played.

In some embodiments, the controller is further configured to perform:

if the video frame which is not played is detected to be a normal video frame, calculating the average brightness of the normal video frame;

and calling the dynamic contrast corresponding to the average brightness when the normal video frame is played.

In a second aspect, a method for adjusting dynamic contrast of a video is provided, including:

In the above embodiment, the abnormal frame is identified before the abnormal video frame of the display timestamp is displayed, and the dynamic contrast is adjusted by comparing the average brightness of the abnormal frame with the average brightness of the previous frame. The flicker phenomenon caused by abnormal display time stamps of individual video frames due to soft decoding can be solved without reducing the dynamic contrast of the whole video, the smooth transition of the brightness of the video pictures is realized, and the user experience is improved.

Drawings

FIG. 1 is a schematic diagram illustrating an operational scenario between a display device and a control device according to some embodiments;

a block diagram of a hardware configuration of a display device 200 according to some embodiments is illustrated in fig. 2;

a block diagram of the hardware configuration of the control device 100 according to some embodiments is illustrated in fig. 3;

a schematic diagram of a software configuration in a display device 200 according to some embodiments is illustrated in fig. 4;

FIG. 5 is a schematic diagram illustrating user interaction provided by a display device according to some embodiments;

FIG. 6 is a flow chart illustrating a method of adjusting dynamic contrast of a video;

another method for adjusting the dynamic contrast of a video is illustrated in fig. 7.

Detailed Description

To make the objects, embodiments and advantages of the present application clearer, the following description of exemplary embodiments of the present application will clearly and completely describe the exemplary embodiments of the present application with reference to the accompanying drawings in the exemplary embodiments of the present application, and it is to be understood that the described exemplary embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

All other embodiments, which can be derived by a person skilled in the art from the exemplary embodiments described herein without inventive step, are intended to be within the scope of the claims appended hereto. In addition, while the disclosure herein has been presented in terms of one or more exemplary examples, it should be appreciated that aspects of the disclosure may be implemented solely as a complete embodiment.

It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.

The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between similar or analogous objects or entities and are not necessarily intended to limit the order or sequence of any particular one, Unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.

The term "module," as used herein, refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and/or software code that is capable of performing the functionality associated with that element.

The term "remote control" as used in this application refers to a component of an electronic device (such as the display device disclosed in this application) that is typically wirelessly controllable over a relatively short range of distances. Typically using infrared and/or Radio Frequency (RF) signals and/or bluetooth to connect with the electronic device, and may also include WiFi, wireless USB, bluetooth, motion sensor, etc. For example: the hand-held touch remote controller replaces most of the physical built-in hard keys in the common remote control device with the user interface in the touch screen.

The term "gesture" as used in this application refers to a user's behavior through a change in hand shape or an action such as hand motion to convey a desired idea, action, purpose, or result.

Fig. 1 is a schematic diagram illustrating an operation scenario between a display device and a control device according to an embodiment. As shown in fig. 1, a user may operate the display device 200 through the mobile terminal 300 and the control device 100.

In some embodiments, the control device 100 may be a remote controller, and the communication between the remote controller and the display device includes an infrared protocol communication or a bluetooth protocol communication, and other short-distance communication methods, etc., and the display device 200 is controlled by wireless or other wired methods. The user may input a user command through a key on a remote controller, voice input, control panel input, etc. to control the display apparatus 200. Such as: the user can input a corresponding control command through a volume up/down key, a channel control key, up/down/left/right moving keys, a voice input key, a menu key, a power on/off key, etc. on the remote controller, to implement the function of controlling the display device 200.

In some embodiments, mobile terminals, tablets, computers, laptops, and other smart devices may also be used to control the display device 200. For example, the display device 200 is controlled using an application program running on the smart device. The application, through configuration, may provide the user with various controls in an intuitive User Interface (UI) on a screen associated with the smart device.

In some embodiments, the mobile terminal 300 may install a software application with the display device 200 to implement connection communication through a network communication protocol for the purpose of one-to-one control operation and data communication. Such as: the mobile terminal 300 and the display device 200 can establish a control instruction protocol, synchronize a remote control keyboard to the mobile terminal 300, and control the display device 200 by controlling a user interface on the mobile terminal 300. The audio and video content displayed on the mobile terminal 300 can also be transmitted to the display device 200, so as to realize the synchronous display function.

As also shown in fig. 1, the display apparatus 200 also performs data communication with the server 400 through various communication means. The display device 200 may be allowed to be communicatively connected through a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various contents and interactions to the display apparatus 200. Illustratively, the display device 200 receives software program updates, or accesses a remotely stored digital media library, by sending and receiving information, as well as Electronic Program Guide (EPG) interactions. The server 400 may be a cluster or a plurality of clusters, and may include one or more types of servers. Other web service contents such as video on demand and advertisement services are provided through the server 400.

The display device 200 may be a liquid crystal display, an OLED display, a projection display device. The particular display device type, size, resolution, etc. are not limiting, and those skilled in the art will appreciate that the display device 200 may be modified in performance and configuration as desired.

The display apparatus 200 may additionally provide an intelligent network tv function of a computer support function including, but not limited to, a network tv, an intelligent tv, an Internet Protocol Tv (IPTV), and the like, in addition to the broadcast receiving tv function.

A hardware configuration block diagram of a display device 200 according to an exemplary embodiment is exemplarily shown in fig. 2.

In some embodiments, at least one of the controller 250, the tuner demodulator 210, the communicator 220, the detector 230, the input/output interface 255, the display 275, the audio output interface 285, the memory 260, the power supply 290, the user interface 265, and the external device interface 240 is included in the display apparatus 200.

In some embodiments, a display 275 receives image signals originating from the first processor output and displays video content and images and components of the menu manipulation interface.

In some embodiments, the display 275, includes a display screen assembly for presenting a picture, and a driving assembly that drives the display of an image.

In some embodiments, the video content is displayed from broadcast television content, or alternatively, from various broadcast signals that may be received via wired or wireless communication protocols. Alternatively, various image contents received from the network communication protocol and sent from the network server side can be displayed.

In some embodiments, the display 275 is used to present a user-manipulated UI interface generated in the display apparatus 200 and used to control the display apparatus 200.

In some embodiments, a driver assembly for driving the display is also included, depending on the type of display 275.

In some embodiments, display 275 is a projection display and may also include a projection device and a projection screen.

In some embodiments, communicator 220 is a component for communicating with external devices or external servers according to various communication protocol types. For example: the communicator may include at least one of a Wifi chip, a bluetooth communication protocol chip, a wired ethernet communication protocol chip, and other network communication protocol chips or near field communication protocol chips, and an infrared receiver.

In some embodiments, the display apparatus 200 may establish control signal and data signal transmission and reception with the external control apparatus 100 or the content providing apparatus through the communicator 220.

In some embodiments, user interface 265 may be configured to receive infrared control signals from control device 100 (e.g., an infrared remote control, etc.).

In some embodiments, the detector 230 is a signal used by the display device 200 to collect an external environment or interact with the outside.

In some embodiments, the detector 230 includes a light receiver, a sensor for collecting the intensity of ambient light, and parameters changes can be adaptively displayed by collecting the ambient light, and the like.

In some embodiments, the detector 230 may further include an image collector, such as a camera, etc., which may be configured to collect external environment scenes, collect attributes of the user or gestures interacted with the user, adaptively change display parameters, and recognize user gestures, so as to implement a function of interaction with the user.

In some embodiments, the detector 230 may also include a temperature sensor or the like, such as by sensing ambient temperature.

In some embodiments, the display apparatus 200 may adaptively adjust a display color temperature of an image. For example, the display apparatus 200 may be adjusted to display a cool tone when the temperature is in a high environment, or the display apparatus 200 may be adjusted to display a warm tone when the temperature is in a low environment.

In some embodiments, the detector 230 may also be a sound collector or the like, such as a microphone, which may be used to receive the user's voice. Illustratively, a voice signal including a control instruction of the user to control the display device 200, or to collect an ambient sound for recognizing an ambient scene type, so that the display device 200 can adaptively adapt to an ambient noise.

In some embodiments, as shown in fig. 2, the input/output interface 255 is configured to allow data transfer between the controller 250 and external other devices or other controllers 250. Such as receiving video signal data and audio signal data of an external device, or command instruction data, etc.

In some embodiments, the external device interface 240 may include, but is not limited to, the following: the interface can be any one or more of a high-definition multimedia interface (HDMI), an analog or data high-definition component input interface, a composite video input interface, a USB input interface, an RGB port and the like. The plurality of interfaces may form a composite input/output interface.

In some embodiments, as shown in fig. 2, the tuning demodulator 210 is configured to receive a broadcast television signal through a wired or wireless receiving manner, perform modulation and demodulation processing such as amplification, mixing, resonance, and the like, and demodulate an audio and video signal from a plurality of wireless or wired broadcast television signals, where the audio and video signal may include a television audio and video signal carried in a television channel frequency selected by a user and an EPG data signal.

In some embodiments, the frequency points demodulated by the tuner demodulator 210 are controlled by the controller 250, and the controller 250 can send out control signals according to user selection, so that the modem responds to the television signal frequency selected by the user and modulates and demodulates the television signal carried by the frequency.

In some embodiments, the broadcast television signal may be classified into a terrestrial broadcast signal, a cable broadcast signal, a satellite broadcast signal, an internet broadcast signal, or the like according to the broadcasting system of the television signal. Or may be classified into a digital modulation signal, an analog modulation signal, and the like according to a modulation type. Or the signals are classified into digital signals, analog signals and the like according to the types of the signals.

In some embodiments, the controller 250 and the modem 210 may be located in different separate devices, that is, the modem 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box. Therefore, the set top box outputs the television audio and video signals modulated and demodulated by the received broadcast television signals to the main body equipment, and the main body equipment receives the audio and video signals through the first input/output interface.

In some embodiments, the controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in memory. The controller 250 may control the overall operation of the display apparatus 200. For example: in response to receiving a user command for selecting a UI object to be displayed on the display 275, the controller 250 may perform an operation related to the object selected by the user command.

In some embodiments, the object may be any one of selectable objects, such as a hyperlink or an icon. Operations related to the selected object, such as: displaying an operation connected to a hyperlink page, document, image, or the like, or performing an operation of a program corresponding to the icon. The user command for selecting the UI object may be a command input through various input means (e.g., a mouse, a keyboard, a touch pad, etc.) connected to the display apparatus 200 or a voice command corresponding to a voice spoken by the user.

As shown in fig. 2, the controller 250 includes at least one of a Random Access Memory 251 (RAM), a Read-Only Memory 252 (ROM), a video processor 270, an audio processor 280, other processors 253 (e.g., a Graphics Processing Unit (GPU), a processor 254 (CPU), a Communication Interface (Communication Interface), and a Communication Bus 256(Bus), which connects the respective components.

In some embodiments, RAM 251 is used to store temporary data for the operating system or other programs that are running

In some embodiments, ROM 252 is used to store instructions for various system boots.

In some embodiments, the ROM 252 is used to store a Basic Input Output System (BIOS). The system is used for completing power-on self-test of the system, initialization of each functional module in the system, a driver of basic input/output of the system and booting an operating system.

In some embodiments, when the power-on signal is received, the display device 200 starts to power up, the CPU executes the system boot instruction in the ROM 252, and copies the temporary data of the operating system stored in the memory to the RAM 251 so as to start or run the operating system. After the start of the operating system is completed, the CPU copies the temporary data of the various application programs in the memory to the RAM 251, and then, the various application programs are started or run.

In some embodiments, processor 254 is used to execute operating system and application program instructions stored in memory. And executing various application programs, data and contents according to various interactive instructions received from the outside so as to finally display and play various audio and video contents.

In some demonstrative embodiments, processor 254 may include a plurality of processors. The plurality of processors may include a main processor and one or more sub-processors. A main processor for performing some operations of the display apparatus 200 in a pre-power-up mode and/or operations of displaying a screen in a normal mode. One or more sub-processors for one operation in a standby mode or the like.

In some embodiments, the graphics processor 253 is used to generate various graphics objects, such as: icons, operation menus, user input instruction display graphics, and the like. The display device comprises an arithmetic unit which carries out operation by receiving various interactive instructions input by a user and displays various objects according to display attributes. And the system comprises a renderer for rendering various objects obtained based on the arithmetic unit, wherein the rendered objects are used for being displayed on a display.

In some embodiments, the video processor 270 is configured to receive an external video signal, and perform video processing such as decompression, decoding, scaling, noise reduction, frame rate conversion, resolution conversion, image synthesis, and the like according to a standard codec protocol of the input signal, so as to obtain a signal that can be displayed or played on the direct display device 200.

In some embodiments, video processor 270 includes a demultiplexing module, a video decoding module, an image synthesis module, a frame rate conversion module, a display formatting module, and the like.

The demultiplexing module is used for demultiplexing the input audio and video data stream, and if the input MPEG-2 is input, the demultiplexing module demultiplexes the input audio and video data stream into a video signal and an audio signal.

And the video decoding module is used for processing the video signal after demultiplexing, including decoding, scaling and the like.

And the image synthesis module is used for carrying out superposition mixing processing on the GUI signal input by the user or generated by the user and the video image after the zooming processing by the graphic generator so as to generate an image signal for display.

The frame rate conversion module is configured to convert an input video frame rate, such as a 60Hz frame rate into a 120Hz frame rate or a 240Hz frame rate, and the normal format is implemented in, for example, an interpolation frame mode.

The display format module is used for converting the received video output signal after the frame rate conversion, and changing the signal to conform to the signal of the display format, such as outputting an RGB data signal.

In some embodiments, the graphics processor 253 may be integrated with the video processor, or may be separately configured, where the graphics processor and the video processor may be configured to perform processing of graphics signals output to the display when the graphics processor and the video processor are integrally configured, and may perform different functions when the graphics processor and the video processor are separately configured, for example, a GPU + frc (frame Rate conversion) architecture.

In some embodiments, the audio processor 280 is configured to receive an external audio signal, decompress and decode the received audio signal according to a standard codec protocol of the input signal, and perform noise reduction, digital-to-analog conversion, and amplification processes to obtain an audio signal that can be played in a speaker.

In some embodiments, video processor 270 may comprise one or more chips. The audio processor may also comprise one or more chips.

In some embodiments, the video processor 270 and the audio processor 280 may be separate chips or may be integrated together with the controller in one or more chips.

In some embodiments, the audio output, under the control of controller 250, receives sound signals output by audio processor 280, such as: the speaker 286, and an external sound output terminal of a generating device that can output to an external device, in addition to the speaker carried by the display device 200 itself, such as: external sound interface or earphone interface, etc., and may also include a near field communication module in the communication interface, for example: and the Bluetooth module is used for outputting sound of the Bluetooth loudspeaker.

The power supply 290 supplies power to the display device 200 from the power input from the external power source under the control of the controller 250. The power supply 290 may include a built-in power supply circuit installed inside the display apparatus 200, or may be a power supply interface installed outside the display apparatus 200 to provide an external power supply in the display apparatus 200.

A user interface 265 for receiving an input signal of a user and then transmitting the received user input signal to the controller 250. The user input signal may be a remote controller signal received through an infrared receiver, and various user control signals may be received through the network communication module.

In some embodiments, the user inputs a user command through the control device 100 or the mobile terminal 300, the user input interface responds to the user input through the controller 250 according to the user input, and the display device 200 responds to the user input through the controller 250.

In some embodiments, a user may enter user commands on a Graphical User Interface (GUI) displayed on the display 275, and the user input interface receives the user input commands through the Graphical User Interface (GUI). Alternatively, the user may input the user command by inputting a specific sound or gesture, and the user input interface receives the user input command by recognizing the sound or gesture through the sensor.

In some embodiments, a "user interface" is a media interface for interaction and information exchange between an application or operating system and a user that enables conversion between an internal form of information and a form that is acceptable to the user. A commonly used presentation form of the User Interface is a Graphical User Interface (GUI), which refers to a User Interface related to computer operations and displayed in a graphical manner. It may be an interface element such as an icon, a window, a control, etc. displayed in the display screen of the electronic device, where the control may include a visual interface element such as an icon, a button, a menu, a tab, a text box, a dialog box, a status bar, a navigation bar, a Widget, etc.

The memory 260 includes a memory storing various software modules for driving the display device 200. Such as: various software modules stored in the first memory, including: at least one of a basic module, a detection module, a communication module, a display control module, a browser module, and various service modules.

The base module is a bottom layer software module for signal communication between various hardware in the display device 200 and for sending processing and control signals to the upper layer module. The detection module is used for collecting various information from various sensors or user input interfaces, and the management module is used for performing digital-to-analog conversion and analysis management.

For example, the voice recognition module comprises a voice analysis module and a voice instruction database module. The display control module is used for controlling the display to display the image content, and can be used for playing the multimedia image content, UI interface and other information. And the communication module is used for carrying out control and data communication with external equipment. And the browser module is used for executing a module for data communication between browsing servers. And the service module is used for providing various services and modules including various application programs. Meanwhile, the memory 260 may store a visual effect map for receiving external data and user data, images of various controls in various user interfaces, and a focus object, etc.

Fig. 3 exemplarily shows a block diagram of a configuration of the control apparatus 100 according to an exemplary embodiment. As shown in fig. 3, the control apparatus 100 includes a controller 110, a communication interface 130, a user input/output interface, a memory, and a power supply source.

The control device 100 is configured to control the display device 200 and may receive an input operation instruction of a user and convert the operation instruction into an instruction recognizable and responsive by the display device 200, serving as an interaction intermediary between the user and the display device 200. Such as: the user responds to the channel up and down operation by operating the channel up and down keys on the control device 100.

In some embodiments, the control device 100 may be a smart device. Such as: the control apparatus 100 may install various applications that control the display apparatus 200 according to user demands.

In some embodiments, as shown in fig. 1, a mobile terminal 300 or other intelligent electronic device may function similar to the control device 100 after installing an application that manipulates the display device 200. Such as: the user may implement the functions of controlling the physical keys of the device 100 by installing applications, various function keys or virtual buttons of a graphical user interface available on the mobile terminal 300 or other intelligent electronic device.

The controller 110 includes a processor 112 and RAM 113 and ROM 114, a communication interface 130, and a communication bus. The controller is used to control the operation of the control device 100, as well as the communication cooperation between the internal components and the external and internal data processing functions.

The communication interface 130 enables communication of control signals and data signals with the display apparatus 200 under the control of the controller 110. Such as: the received user input signal is transmitted to the display apparatus 200. The communication interface 130 may include at least one of a WiFi chip 131, a bluetooth module 132, an NFC module 133, and other near field communication modules.

A user input/output interface 140, wherein the input interface includes at least one of a microphone 141, a touch pad 142, a sensor 143, keys 144, and other input interfaces. Such as: the user can realize a user instruction input function through actions such as voice, touch, gesture, pressing, and the like, and the input interface converts the received analog signal into a digital signal and converts the digital signal into a corresponding instruction signal, and sends the instruction signal to the display device 200.

The output interface includes an interface that transmits the received user instruction to the display apparatus 200. In some embodiments, the interface may be an infrared interface or a radio frequency interface. Such as: when the infrared signal interface is used, the user input instruction needs to be converted into an infrared control signal according to an infrared control protocol, and the infrared control signal is sent to the display device 200 through the infrared sending module. The following steps are repeated: when the rf signal interface is used, a user input command needs to be converted into a digital signal, and then the digital signal is modulated according to the rf control signal modulation protocol and then transmitted to the display device 200 through the rf transmitting terminal.

In some embodiments, the control device 100 includes at least one of a communication interface 130 and an input-output interface 140. The control device 100 is provided with a communication interface 130, such as: the WiFi, bluetooth, NFC, etc. modules may transmit the user input command to the display device 200 through the WiFi protocol, or the bluetooth protocol, or the NFC protocol code.

A memory 190 for storing various operation programs, data and applications for driving and controlling the control apparatus 200 under the control of the controller. The memory 190 may store various control signal commands input by a user.

And a power supply 180 for providing operational power support to the various elements of the control device 100 under the control of the controller. A battery and associated control circuitry.

In some embodiments, the system may include a Kernel (Kernel), a command parser (shell), a file system, and an application program. The kernel, shell, and file system together make up the basic operating system structure that allows users to manage files, run programs, and use the system. After power-on, the kernel is started, kernel space is activated, hardware is abstracted, hardware parameters are initialized, and virtual memory, a scheduler, signals and interprocess communication (IPC) are operated and maintained. And after the kernel is started, loading the Shell and the user application program. The application program is compiled into machine code after being started, and a process is formed.

Referring to fig. 4, in some embodiments, the system is divided into four layers, which are an Application (Applications) layer (abbreviated as "Application layer"), an Application Framework (Application Framework) layer (abbreviated as "Framework layer"), an Android runtime (Android runtime) and system library layer (abbreviated as "system runtime library layer"), and a kernel layer from top to bottom.

In some embodiments, at least one application program runs in the application program layer, and the application programs can be Window (Window) programs carried by an operating system, system setting programs, clock programs, camera applications and the like; or may be an application developed by a third party developer such as a hi program, a karaoke program, a magic mirror program, or the like. In specific implementation, the application packages in the application layer are not limited to the above examples, and may actually include other application packages, which is not limited in this embodiment of the present application.

The framework layer provides an Application Programming Interface (API) and a programming framework for the application program of the application layer. The application framework layer includes a number of predefined functions. The application framework layer acts as a processing center that decides to let the applications in the application layer act. The application program can access the resource in the system and obtain the service of the system in execution through the API interface

As shown in fig. 4, in the embodiment of the present application, the application framework layer includes a manager (Managers), a Content Provider (Content Provider), and the like, where the manager includes at least one of the following modules: an Activity Manager (Activity Manager) is used for interacting with all activities running in the system; the Location Manager (Location Manager) is used for providing the system service or application with the access of the system Location service; a Package Manager (Package Manager) for retrieving various information related to an application Package currently installed on the device; a Notification Manager (Notification Manager) for controlling display and clearing of Notification messages; the Window Manager (Window Manager) is used for managing icons, windows, toolbars, wallpapers and desktop components on the user interface; the detection module is used for uniformly detecting the state of the camera and prompting a user when abnormality occurs.

In some embodiments, the activity manager is to: managing the life cycle of each application program and the general navigation backspacing function, such as controlling the exit of the application program (including switching the user interface currently displayed in the display window to the system desktop), opening, backing (including switching the user interface currently displayed in the display window to the previous user interface of the user interface currently displayed), and the like.

In some embodiments, the window manager is configured to manage all window processes, such as obtaining a display size, determining whether a status bar is available, locking a screen, intercepting a screen, controlling a display change (e.g., zooming out, dithering, distorting, etc.) and the like.

In some embodiments, the system runtime layer provides support for the upper layer, i.e., the framework layer, and when the framework layer is used, the android operating system runs the C/C + + library included in the system runtime layer to implement the functions to be implemented by the framework layer.

In some embodiments, the kernel layer is a layer between hardware and software. As shown in fig. 4, the core layer includes at least one of the following drivers: audio drive, display drive, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (such as fingerprint sensor, temperature sensor, touch sensor, pressure sensor, etc.), and so on.

In some embodiments, the kernel layer further comprises a power driver module for power management.

In some embodiments, software programs and/or modules corresponding to the software architecture of fig. 4 are stored in the first memory or the second memory shown in fig. 2 or 3.

In some embodiments, taking the magic mirror application (photographing application) as an example, when the remote control receiving device receives a remote control input operation, a corresponding hardware interrupt is sent to the kernel layer. The kernel layer processes the input operation into an original input event (including information such as a value of the input operation, a timestamp of the input operation, etc.). The raw input events are stored at the kernel layer. The application program framework layer obtains an original input event from the kernel layer, identifies a control corresponding to the input event according to the current position of the focus and uses the input operation as a confirmation operation, the control corresponding to the confirmation operation is a control of a magic mirror application icon, the magic mirror application calls an interface of the application framework layer to start the magic mirror application, and then the kernel layer is called to start a camera driver, so that a static image or a video is captured through the camera.

In some embodiments, for a display device with a touch function, taking a split screen operation as an example, the display device receives an input operation (such as a split screen operation) that a user acts on a display screen, and the kernel layer may generate a corresponding input event according to the input operation and report the event to the application framework layer. The window mode (such as multi-window mode) corresponding to the input operation, the position and size of the window and the like are set by an activity manager of the application framework layer. And the window management of the application program framework layer draws a window according to the setting of the activity manager, then sends the drawn window data to the display driver of the kernel layer, and the display driver displays the corresponding application interface in different display areas of the display screen.

In some embodiments, the application layer contains at least one application that can display a corresponding icon control in the display, such as: the system comprises a live television application icon control, a video on demand application icon control, a media center application icon control, an application center icon control, a game application icon control and the like.

In some embodiments, the live television application may provide live television via different signal sources. For example, a live television application may provide television signals using input from cable television, radio broadcasts, satellite services, or other types of live television services. And, the live television application may display video of the live television signal on the display device 200.

In some embodiments, a video-on-demand application may provide video from different storage sources. Unlike live television applications, video on demand provides a video display from some storage source. For example, the video on demand may come from a server side of the cloud storage, from a local hard disk storage containing stored video programs.

In some embodiments, the media center application may provide various applications for multimedia content playback. For example, a media center, which may be other than live television or video on demand, may provide services that a user may access to various images or audio through a media center application.

In some embodiments, an application center may provide storage for various applications. The application may be a game, an application, or some other application associated with a computer system or other device that may be run on the smart television. The application center may obtain these applications from different sources, store them in local storage, and then be operable on the display device 200.

In some embodiments, when the user plays the video, the dynamic contrast may be manually adjusted, that is, the level value of the dynamic contrast is generally set to a fixed value, as shown in fig. 5, the user may change the level value of the dynamic contrast by operating the control device, where the level values of the dynamic contrast are "off", "low", "medium", and "high", respectively, and in fig. 5, the level value of the dynamic contrast set by the user is "medium".

A flow chart of a method of adjusting the dynamic contrast of a video is illustrated in fig. 6.

With reference to fig. 6, the method comprises the following steps:

step S601: soft decoding the played video to obtain video information, wherein the video information comprises a display time stamp of a video frame;

in some embodiments, the video soft decoding results in an AVpacket (a data structure) in which the encoded compressed data is stored. Some of these data contain additional information such as Presentation Time Stamp (PTS), Decoding Time Stamp (DTS), data duration, index of the media stream in which it is located, etc. The display time stamp of the video frame is obtained from the AVpacket.

Step S602: detecting whether an unplayed video frame is an abnormal frame or not, wherein the abnormal frame comprises a video frame with an abnormal display timestamp;

if the unplayed video frame is an abnormal frame, step S603 is performed.

Step S603: calculating and comparing the average brightness of the abnormal frame and the video frame before the abnormal frame;

the calculation formula of the average brightness of the video frame is as follows:

wherein, Lum_aveFor average luminance, δ is a small constant to prevent the logarithm calculation from going to infinity. For example, δ may be 0.0001, Lum (x, y) is the luminance value of the pixel with coordinates (x, y), and N is the total number of pixels.

Step S604: and according to the comparison result, adjusting the dynamic contrast when the abnormal frame is played.

In some embodiments, if the average brightness of the previous video frame is within a first preset brightness range and the difference between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a first preset difference range, the dynamic contrast ratio remains unchanged when the abnormal frame is played.

For example: a first predetermined brightness range N₁Is [200, 300 ]), a first preset difference range X₁And 0, 20), the average brightness of the abnormal frame is 260nit, and the average brightness of the video frame before the abnormal frame is 250 nit. The average brightness 250nit of the previous video frame of the abnormal frame is within a first preset brightness range, the average brightness difference value between the abnormal frame and the previous frame is 10nit, and 10nit is within the first preset difference value range, so that the influence of the abnormal frame on video playing can be judged to be small, and the dynamic contrast remains unchanged.

In some embodiments, if the average brightness of the previous video frame is within a first preset brightness range, the average brightness of the abnormal frame is greater than the average brightness of the previous video frame, and the difference between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a second preset difference range, the dynamic contrast is reduced by a first preset value when the abnormal frame is played.

For example: a first predetermined brightness range N₁Is [200, 300)), the second preset difference range X₂Is [20, 30 ]]The first preset value is 1. The average luminance of the abnormal frame is 275nit, and the video before the abnormal frameThe frame average luminance is 250 nit. The average brightness 250nit of the previous video frame of the abnormal frame is within a first preset brightness range, the average brightness difference value of the abnormal frame and the previous frame is 25nit, 25nit is within a second preset difference value range, the average brightness 275nit of the abnormal frame is larger than the average brightness 250nit of the previous video frame, and when the abnormal frame is played, the dynamic contrast level value is-1, namely if the level of the dynamic contrast of the previous frame is played is 'middle', when the abnormal frame is played, the level of the dynamic contrast is reduced to 'low'.

In some embodiments, if the average brightness of the previous video frame is within a first preset brightness range, the average brightness of the abnormal frame is smaller than the average brightness of the previous video frame, and the difference between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a second preset difference range, the dynamic contrast is increased by a first preset value when the abnormal frame is played.

For example: a first predetermined brightness range N₁Is [200, 300)), the second preset difference range X₂Is [20, 30 ]]The first preset value is 1. The average luminance of the outlier frame was 250nit and the average luminance of the previous video frame of the outlier frame was 275 nit. The average brightness 275nit of a previous video frame of an abnormal frame is within a first preset brightness range, the average brightness difference value of the abnormal frame and the previous frame is 25nit, 25nit is within a second preset difference value range, the average brightness 250nit of the abnormal frame is smaller than the average brightness 275nit of the previous video frame, and when the abnormal frame is played, the dynamic contrast level value is +1, namely if the level of the dynamic contrast of the previous frame is played is 'middle', when the abnormal frame is played, the level of the dynamic contrast is increased to 'high'.

In some embodiments, if the average brightness of the previous video frame is within a first preset brightness range, the average brightness of the abnormal frame is greater than the average brightness of the previous video frame, and the difference between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a third preset difference range, the dynamic contrast is reduced by a second preset value when the abnormal frame is played.

For example: a first predetermined brightness range N₁Is 200, 300,the third preset difference range is X₃Is (30, + ∞) and the second preset value is 2. The average luminance of the outlier frame is 285nit and the average luminance of the previous video frame of the outlier frame is 250 nit. The average brightness 250nit of a previous video frame of an abnormal frame is within a first preset brightness range, the average brightness difference value of the abnormal frame and the previous frame is 35nit, 35nit is within a third preset difference value range, the average brightness 285nit of the abnormal frame is greater than the average brightness 250nit of the previous video frame, and when the abnormal frame is played, the dynamic contrast level value is-2, namely if the level of the dynamic contrast of the previous frame is played is 'high', and when the abnormal frame is played, the level of the dynamic contrast is reduced to 'low'.

In some embodiments, if the average brightness of the previous video frame is within a first preset brightness range, the average brightness of the abnormal frame is smaller than the average brightness of the previous video frame, and the difference between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a third preset difference range, the dynamic contrast is increased by a second preset value when the abnormal frame is played.

For example: a first predetermined brightness range N₁Is [200, 300 ]), a third predetermined difference range X₃Is (30, + ∞) and the second preset value is 2. The average luminance of the outlier frame is 250nit and the average luminance of the previous video frame of the outlier frame is 285 nit. The average brightness 285nit of the previous video frame of the abnormal frame is within a first preset brightness range, the average brightness difference value between the abnormal frame and the previous frame is 35nit, 35nit is within a third preset difference value range, the average brightness 250nit of the abnormal frame is smaller than the average brightness 285nit of the previous video frame, and when the abnormal frame is played, the dynamic contrast level value is +2, namely if the level of the dynamic contrast of the previous frame is played is 'low', and when the abnormal frame is played, the level of the dynamic contrast is increased to 'high'.

In some embodiments, if the average brightness of the previous video frame is within a second preset range and the difference between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a fourth preset difference range, the dynamic contrast ratio remains unchanged when the abnormal frame is played.

For example: first, theTwo predetermined brightness ranges N₂Is [300, 500 ]]Fourth predetermined difference range X₄Is [0,50 ]]The average luminance of the abnormal frame is 360nit, and the average luminance of the video frame before the abnormal frame is 400 nit. The average brightness 400nit of the previous video frame of the abnormal frame is within the second preset brightness range, the average brightness difference value between the abnormal frame and the previous frame is 40nit, and 40nit is within the fourth preset difference value range, so that the influence of the abnormal frame on video playing can be judged to be small, and the dynamic contrast remains unchanged.

In some embodiments, if the average brightness of the previous video frame is within a second preset range, the average brightness of the abnormal frame is greater than the average brightness of the previous video frame, and the difference between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a fifth preset difference range, the dynamic contrast is reduced by a first preset value when the abnormal frame is played.

For example: a second predetermined brightness range N₂Is [300, 500 ]]Fifth predetermined difference range X₅Is (50, + ∞), the first preset value is 1. The average luminance of the outlier frame is 460nit and the average luminance of the previous video frame of the outlier frame is 400 nit. The average brightness 400nit of the previous video frame of the abnormal frame is within the second preset brightness range, the average brightness difference value between the abnormal frame and the previous frame is 60nit, 60nit is within the fifth preset difference value range, and the average brightness 460nit of the abnormal frame is greater than the average brightness 400nit of the previous video frame. When playing the abnormal frame, the dynamic contrast level value is-1, that is, if the level of the dynamic contrast of the previous frame is 'middle', when playing the abnormal frame, the level of the dynamic contrast is increased to 'low'.

In some embodiments, if the average brightness of the previous video frame is within a second preset range, the average brightness of the abnormal frame is less than the average brightness of the previous video frame, and the difference between the average brightness of the abnormal frame and the average brightness of the previous video frame is within a fifth preset difference range, the dynamic contrast is increased by a first preset value when the abnormal frame is played.

For example: a second predetermined brightness range N₂Is [300, 500 ]]Fifth predetermined difference range X₅Is (50, + ∞), the first preset value is 1. The average luminance of the outlier frame is 340nit and the average luminance of the previous video frame of the outlier frame is 400 nit. The average brightness 400nit of the previous video frame of the abnormal frame is within the second preset brightness range, the average brightness difference value between the abnormal frame and the previous frame is 60nit, 60nit is within the fifth preset difference value range, and the average brightness 340nit of the abnormal frame is smaller than the average brightness 400nit of the previous video frame. When playing the abnormal frame, the dynamic contrast level value is +1, that is, if the level of the dynamic contrast of the previous frame is 'middle', when playing the abnormal frame, the level of the dynamic contrast is increased to 'high'.

It should be noted that the maximum brightness of a typical display device is 500-1000nit, but after more than 500nit, the human eye cannot perceive the brightness change, and at the brightness less than 200nit, the human eye is regarded as black. Therefore, luminance greater than 500nit and luminance less than 200nit are not within the scope of dynamic contrast adjustment of the present application.

If the unplayed video frame is a normal video frame, step S605 is executed.

Step S605: calculating the average brightness of the normal video frame;

step S606: and calling the dynamic contrast corresponding to the average brightness when the normal video frame is played.

In some embodiments, the average brightness of the video frame is divided into three levels, the maximum brightness of the video frame is L _ max, and the three levels are 200-300nit, 300-500nit, and 500-L _ max nit according to the average brightness of the video frame, and the 3 levels of the dynamic contrast corresponding to the average brightness are "low", "medium", and "high", respectively.

With reference to fig. 7, the method comprises the following steps:

step S701: soft decoding the played video to obtain video information, wherein the video information comprises a display time stamp of a video frame;

step S702: detecting whether an unplayed video frame is an abnormal frame or not, wherein the abnormal frame comprises a video frame with an abnormal display timestamp;

if the unplayed video frame is an abnormal frame, step S703 is executed.

Step S703: calculating the average brightness of the abnormal frame and a video frame before the abnormal frame;

step S704: and judging whether the abnormal frame is larger than the average brightness of the previous video frame of the abnormal frame.

If the abnormal frame is larger than the average brightness of the video frame before the abnormal frame, step S705 is performed.

Step S705: when playing the abnormal frame, the dynamic contrast is reduced.

If the abnormal frame is not larger than the average brightness of the previous video frame of the abnormal frame, step S706 is performed.

Step S706: and judging whether the abnormal frame is smaller than the average brightness of the previous video frame of the abnormal frame.

If the abnormal frame is smaller than the average brightness of the video frame preceding the abnormal frame, step S707 is performed.

Step S707: when playing the abnormal frame, the dynamic contrast is reduced.

If the abnormal frame is not less than the average brightness of the video frame before the abnormal frame, i.e. the abnormal frame is equal to the average brightness of the video frame before the abnormal frame, step S708 is executed.

Step S708: the dynamic contrast remains unchanged when the abnormal frame is played.

If the unplayed video frame is a normal video frame, step S709 is executed.

Step S709: calculating the average brightness of the normal video frame;

step S710: and calling the dynamic contrast corresponding to the average brightness when the normal video frame is played.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A display device, comprising:

a display;

a controller for performing:

2. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

3. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

4. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

5. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

6. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

7. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

8. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

9. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

10. The display device according to claim 1, wherein the controller is further configured to perform the adjusting the dynamic contrast while playing the abnormal frame according to the comparison result in the following manner:

11. The display device according to claim 1, wherein the controller is further configured to perform:

12. A method for adjusting dynamic contrast of video, comprising: