CN114173187A

CN114173187A - Method for determining dynamic contrast and display device

Info

Publication number: CN114173187A
Application number: CN202111064511.6A
Authority: CN
Inventors: 沈海杰; 王烨东; 刁玉洁
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2020-09-11
Filing date: 2021-09-10
Publication date: 2022-03-11

Abstract

The embodiment of the application provides a method and a display device for determining dynamic contrast, wherein before an image is displayed on a display screen, an image data signal input in the display screen is acquired, whether a black display area exists in an image to be displayed corresponding to the image data signal is determined, when the black display area exists, a target display area occupied by the black display area in the image to be displayed is determined, and then the dynamic contrast of the display screen is determined according to brightness information of pixels in the remaining display area except the target display area in the image to be displayed. That is, in the embodiment of the present application, when the edge of the image to be displayed includes the concentrated black edge distribution region, the black display region in the image to be displayed is removed, and the dynamic contrast is determined only according to the brightness information of each pixel in the effective display region of the image to be displayed, so that the determined dynamic contrast is not affected by the brightness of the pixel in the black display region, and therefore, the accuracy is higher.

Description

Method for determining dynamic contrast and display device

The present application claims priority to chinese patent application filed on 11/09/2020/10 by the chinese patent office under the name "dynamic contrast determination method and display device" under the application number 202010955661.5, the entire contents of which are incorporated herein by reference.

Technical Field

The embodiment of the application relates to the technical field of image processing, in particular to a method for determining dynamic contrast and display equipment.

Background

With the popularization of applications such as network video software, Internet Protocol Television (IPTV), and network players, the situation that a user watches on-demand movies or live videos through a display device is greatly increased.

Currently, when determining the dynamic contrast of a display screen, a display device usually determines the dynamic contrast according to the brightness of all display pixels in the display screen. For various display devices, the higher the contrast, the clearer and more striking the displayed image and the brighter and more beautiful color, and the high contrast is also helpful for the definition, detail representation, gray level representation and the like of the image.

However, when the aspect ratio of the effective area of the video image played by the display device is different from the aspect ratio of the output signal of the display device, the display device may implement the aspect conversion by the black-edge manner. For example, the aspect ratio of a movie is at most 21:9, the aspect ratio of a part of radio and television programs is 4:3, and when the display device outputs the movie with the aspect ratio of 16:9, black edges exist above, below, or on the left and right of a display image, which may cause the dynamic contrast determined by the display device to be lower than the ideal dynamic contrast, thereby affecting the playing effect.

Disclosure of Invention

The embodiment of the application provides a method for determining dynamic contrast and display equipment, which can solve the technical problem that the accuracy of a mode for determining the dynamic contrast by the current display equipment is not high.

In a first aspect, an embodiment of the present application provides a display device, including:

and the display screen is used for displaying images.

A controller communicatively coupled to the display screen, the controller configured to:

acquiring an image data signal input in the display screen, and determining whether a black display area exists in an image to be displayed corresponding to the image data signal;

when a black display area exists in the image to be displayed, determining a target display area occupied by the black display area in the image to be displayed;

and determining the dynamic contrast of the display screen according to the brightness information of each pixel in the rest display area except the target display area in the image to be displayed.

In a second aspect, an embodiment of the present application provides a method for determining a dynamic contrast ratio, where the method includes:

According to the method and the display device for determining the dynamic contrast, before the image is displayed on the display screen, the image data signal input into the display screen is obtained, whether a black display area exists in the image to be displayed corresponding to the image data signal is determined, when the black display area exists, a target display area occupied by the black display area in the image to be displayed is determined, and then the dynamic contrast of the display screen is determined according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed. That is, in the embodiment of the present application, when the edge of the image to be displayed includes the concentrated black edge distribution region, the black display region in the image to be displayed is removed, and the dynamic contrast is determined only according to the brightness information of each pixel in the effective display region of the image to be displayed, so that the determined dynamic contrast is not affected by the brightness of the pixel in the black display region, and therefore, the accuracy is higher.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present application or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive exercise.

Fig. 1 is a schematic diagram illustrating an operational scenario between a display device and a control apparatus 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;

FIG. 3 illustrates an icon control interface display diagram of an application in a display device 200, according to some embodiments;

FIG. 4 is a display diagram illustrating a black display area in a display screen according to some embodiments;

FIGS. 5a and 5b illustrate display diagrams of a first detection region in a display screen according to some embodiments;

a flow chart diagram of a dynamic contrast determination method is exemplarily shown in fig. 6.

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.

Fig. 1 is a schematic diagram illustrating an operation scenario between a display device and a control apparatus 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 apparatus 100.

In some embodiments, the control apparatus 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, or a projection display. 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 screen 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 component for presenting a picture, and a driving component for driving 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 screen 275 is used to present a user-manipulated UI interface generated in the display device 200 and used to control the display device 200.

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

In some embodiments, the display screen 275 is a projection display screen 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, the user interface 265 may be configured to receive infrared control signals from a 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 displayed on the display 275, the controller 250 may perform an operation related to the object selected by the user command.

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 Central Processing Unit 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, CPU 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 example embodiments, the CPU processor 254 may comprise 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 screen.

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 and the video processor may be integrated or separately configured, and the integrated configuration may perform processing of a graphics signal output to the display screen, and the separate configuration may perform different functions, 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.

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 apparatus 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 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.

In some embodiments, as shown in fig. 3, the application layer containing at least one application may display a corresponding icon control in the display screen, 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.

At present, when the amplitude ratio of an effective display area of a video image played by display equipment is different from the amplitude ratio of an output signal of a display screen of the display equipment, the display equipment can realize amplitude conversion in a black edge mode, and the edge of the played video image has a black edge, so that the dynamic contrast determined by the display equipment is lower than the ideal dynamic contrast, and the playing effect is influenced.

In order to solve the technical problem, in the embodiment of the present application, when the edge of the to-be-displayed image includes a concentrated black edge distribution region, the black display region in the to-be-played video image is removed, and the dynamic contrast is determined only according to the brightness information of each pixel in the effective display region of the to-be-played video image, so that the determined dynamic contrast is not affected by the brightness of the pixel in the black display region, and therefore, the accuracy is higher. The following examples are given for illustrative purposes.

In the embodiment of the present application, the controller 250 is configured to:

before displaying an image on a display screen, acquiring an image data signal input in the display screen, and determining whether a black display area exists in an image to be displayed corresponding to the image data signal; when a black display area exists in the image to be displayed, detecting a target display area occupied by the black display area in the image to be displayed; and determining the dynamic contrast of the display screen according to the brightness information of each pixel in the rest display area except the target display area in the image to be displayed.

The black display area can be understood as a black part which is more than the periphery of the original photographic picture (or an effective display picture) when the normal original photographic picture (or the effective display picture) is displayed in the display screen, and is also called as a black edge. The black border is present in the video image, typically due to the difference in the aspect ratio of the original image and the aspect ratio of the display screen, and the position of the black border in the video image may be different. For example, it is possible to locate only at the upper and lower edges of the display screen; it is also possible to locate only at the left and right edges of the display screen; it is also possible to locate the four edges of the display screen at the same time.

For better understanding of the embodiments of the present application, referring to fig. 4, a display diagram of a black display area in an image to be displayed according to some embodiments is exemplarily shown in fig. 4. In fig. 4, 401 denotes an object image displayed in the

display screen

275, and 402 denotes a black display area generated when the object image 401 is displayed in the display screen 275.

The display device provided by the embodiment of the application acquires an image data signal input in a display screen before the display screen displays an image, determines whether a black display area exists in an image to be displayed corresponding to the image data signal, determines a target display area occupied by the black display area in the image to be displayed when the black display area exists, and then determines the dynamic contrast of the display screen according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed, so that the determined dynamic contrast is not influenced by the brightness of the pixel in the black display area, and the accuracy is higher.

Specifically, when detecting whether a black display area exists in the image to be displayed, it may be detected whether the black display area exists only in the first detection area in the image to be displayed; when a black display area exists in the first detection area, the existence of the black display area in the image to be displayed is determined.

In some embodiments, the display resolution of the display screen, that is, the amplitude-to-amplitude ratio of the display screen, and the type of the image data signal may be determined, and then the first detection area in the image to be displayed may be determined according to the display resolution of the display screen and the type of the image data signal; the first detection area includes a first upper edge detection area, a first lower edge detection area, a first left edge detection area and a first right edge detection area.

Illustratively, the aspect ratio for standard televisions is typically 4:3 (1.33: 1), while the aspect ratio for wide screen televisions and HDTV high definition televisions is typically 16:9 (1.78: 1). The aspect ratio of the movie video data signal is typically 21:9, and the aspect ratio of the radio program video data signal is typically 4: 3.

For example, the first upper edge detection area is located at an upper edge of the image to be displayed, and the width of the first upper edge detection area may account for 6% of the width of the image to be displayed; the first lower edge detection area is located at the lower edge of the image to be displayed, and the width of the first lower edge detection area can account for 6% of the width of the image to be displayed; the first left edge detection area is located at the left edge of the image to be displayed, and the width of the first left edge detection area may account for 6% of the length of the image to be displayed; the first right edge detection area is located at the right edge of the image to be displayed, and the width of the first right edge detection area may occupy 6% of the length of the image to be displayed.

For better understanding of the embodiments of the present application, referring to fig. 5a and 5b, fig. 5a and 5b schematically illustrate display diagrams of a first detection area in an image to be displayed according to some embodiments.

In fig. 5a, 501 denotes a first upper edge detection area, and 502 denotes a first lower edge detection area; in fig. 5b, 503 denotes a first left edge detection area, and 504 denotes a first right edge detection area.

In some embodiments, when detecting whether there is a black display area in the first detection area, the average luminance values and luminance histograms of pixels included in the first upper edge detection area, the first lower edge detection area, the first left edge detection area, and the first right edge detection area are respectively determined, and when the average luminance value of the pixels included in any one of the detection areas is smaller than a preset luminance threshold and the luminance values in the corresponding luminance histogram are distributed within a preset range, it is determined that there is a black display area in the detection area.

For example, when the average brightness value of the pixels included in the first upper edge detection region is smaller than the preset brightness threshold and the brightness value distribution in the corresponding brightness histogram is within the preset value range, it is determined that the black display region exists in the first upper edge detection region.

The display device that this application embodiment provided, because the effective display area of the video image who plays when display device is different with the width-to-width ratio specification of display screen of display device, the black display area that produces in treating the display image can distribute in the border position of treating the display image, consequently, this application is treating whether there is the black display area in the display image in the detection, only detect in waiting the first detection area in the display image, not only can accurately detect out whether there is the black display area in treating the display image, can also effectively improve detection efficiency.

Based on the description in the above embodiments, in some possible embodiments of the application, when it is determined that a black display region exists in an image to be displayed, a target display region occupied by the black display region is detected in a second detection region in the image to be displayed.

In some embodiments, the display resolution of the display screen and the type of the image data signal are determined, and then a second detection area in the image to be displayed is determined according to the display resolution of the display screen and the type of the image data signal; the second detection area includes a second upper edge detection area, a second lower edge detection area, a second left edge detection area, and a second right edge detection area.

Wherein the second detection region includes the first detection region.

For example, the first upper edge detection region is located at an upper edge of the image to be displayed, and a width of the first upper edge detection region may account for 12% of a width of the image to be displayed; considering the subtitle superposition condition, the first lower edge detection area is located at the lower edge of the image to be displayed, and the width of the first lower edge detection area may account for 16% of the width of the image to be displayed; the first left edge detection area is located at the left edge of the image to be displayed, and the width of the first left edge detection area may account for 13% of the length of the image to be displayed; the first right edge detection area is located at a right edge of the image to be displayed, and a width of the first right edge detection area may occupy 13% of a length of the image to be displayed.

In some embodiments, when detecting the target display area occupied by the black display area, the target pixels belonging to the black display area in the pixels in the second detection area may be determined by traversing the pixels in the second detection area; and then determining a target display area occupied by the black display area according to the determined position of the target pixel belonging to the black display area in the image to be displayed.

For example, when a black display area exists in the first upper edge detection area and the first lower edge detection area, each row of pixels in the second upper edge detection area and the second lower edge detection area is traversed, and if a ratio of a number of black pixels continuously distributed in a currently traversed row of pixels to a total number of pixels in the currently traversed row of pixels is greater than a preset threshold, it is determined that the currently traversed row of pixels belongs to a target pixel in the black display area.

And traversing each column of pixels in the second left edge detection area and the second right edge detection area when the black display area exists in the first left edge detection area and the first right edge detection area, and determining that the currently traversed column of pixels belongs to the target pixel in the black display area if the ratio of the number of the continuously distributed black pixels in the currently traversed column of pixels to the total number of the pixels in the currently traversed column of pixels is greater than a preset threshold value.

For better understanding of the embodiments of the present application, the present application takes the first upper edge detection area as an example for description:

traversing each row of pixels in the first upper edge detection area from top to bottom, and if the ratio of the number of the black pixels continuously distributed in the currently traversed row of pixels to the total number of the pixels in the currently traversed row of pixels is greater than a preset threshold value, determining that the currently traversed row of pixels belongs to the target pixels in the black display area. And after traversing is finished, determining an area occupied by continuous rows of target pixels in the first upper edge detection area as a target display area occupied by a black display area.

According to the display device provided by the embodiment of the application, the target display area occupied by the black display area in the image to be displayed can be accurately determined by traversing the pixels in the second detection area, and the detection efficiency is high.

Based on the content described in the foregoing embodiments, an embodiment of the present application further provides a method for determining a dynamic contrast ratio, and with reference to fig. 6, fig. 6 schematically illustrates a flow chart of the method for determining a dynamic contrast ratio, where the method includes:

s601, acquiring an image data signal input in a display screen, and determining whether a black display area exists in an image to be displayed corresponding to the image data signal.

S602, when a black display area exists in the image to be displayed, determining a target display area occupied by the black display area in the image to be displayed.

S603, determining the dynamic contrast of the display screen according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed.

According to the method for determining the dynamic contrast, when the edge of the video image to be played contains the concentrated black edge distribution area, the black display area in the video image to be played is removed, the dynamic contrast is determined only according to the brightness information of each pixel in the effective display area of the video image to be played, the determined dynamic contrast is not affected by the brightness of the pixel in the black display area, and therefore accuracy is higher.

In a possible implementation manner, the determining whether the black display area exists in the image to be displayed corresponding to the image data signal includes:

detecting whether a black display area exists in a first detection area in an image to be displayed; when a black display area exists in the first detection area, the existence of the black display area in the image to be displayed is determined.

In a possible implementation manner, the detecting whether the black display area exists in the first detection area in the image to be displayed includes:

determining an average brightness value and a brightness histogram of pixels contained in a first detection area; and when the average brightness value of the pixels contained in the first detection area is smaller than a preset brightness threshold value and the brightness value distribution in the brightness histogram is within a preset range, determining that a black display area exists in the first detection area.

In a possible implementation manner, the determining the target display area occupied by the black display area in the image to be displayed includes:

detecting a target display area occupied by a black display area in a second detection area in the image to be displayed; wherein the second detection region includes the first detection region.

In a possible implementation manner, the detecting of the target display area occupied by the black display area in the second detection area in the image to be displayed includes:

traversing pixels in the second detection area, and determining a target pixel in the black display area in the pixels in the second detection area; and determining a target display area occupied by the black display area according to the determined position of the target pixel belonging to the black display area in the image to be displayed.

In a possible embodiment, before determining whether a black display area exists in an image to be displayed corresponding to the image data signal, the method includes:

determining the display resolution of a display screen and the type of the image data signal; determining a first detection area and a second detection area in an image to be displayed according to the display resolution of a display screen and the type of the image data signal; the first detection area comprises a first upper edge detection area, a first lower edge detection area, a first left edge detection area and a first right edge detection area; the second detection region includes a second upper edge detection region, a second lower edge detection region, a second left edge detection region, and a second right edge detection region.

In a possible implementation manner, the traversing the pixels in the second detection area to determine the target pixel belonging to the black display area in the pixels in the second detection area includes:

and traversing each row of pixels in the second upper edge detection area and the second lower edge detection area when the black display area exists in the first upper edge detection area and the first lower edge detection area, and determining that the currently traversed row of pixels belongs to the target pixel in the black display area if the ratio of the continuously distributed number of the black pixels in the currently traversed row of pixels to the total number of the pixels in the currently traversed row of pixels is greater than a preset threshold value.

It should be noted that an implementation principle of each step in the above method for determining a dynamic contrast is consistent with an implementation principle of each function corresponding to the display device described in the above embodiment, and specific reference may be made to the content described in each embodiment corresponding to the display device, which is not described herein again.

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 method for determining dynamic contrast, the method comprising:

acquiring an input image data signal, and determining whether a black display area exists in an image to be displayed corresponding to the image data signal;

2. The method of claim 1, wherein determining whether a black display area exists in the image to be displayed corresponding to the image data signal comprises:

detecting whether a black display area exists in a first detection area in the image to be displayed;

and when a black display area exists in the first detection area, determining that the black display area exists in the image to be displayed.

3. The method of claim 2, wherein detecting whether a black display region exists in a first detection region in the image to be displayed comprises:

determining an average brightness value and a brightness histogram of pixels contained in the first detection area;

and when the average brightness value of the pixels contained in the first detection area is smaller than a preset brightness threshold value and the brightness value distribution in the brightness histogram is within a preset range, determining that a black display area exists in the first detection area.

4. The method of claim 2, wherein determining a target display area occupied by the black display area in the image to be displayed comprises:

detecting a target display area occupied by the black display area in a second detection area in the image to be displayed; the second detection region includes the first detection region.

5. The method according to claim 4, wherein detecting the target display area occupied by the black display area in a second detection area in the image to be displayed comprises:

traversing pixels in the second detection area, and determining a target pixel in the black display area in the pixels in the second detection area;

and determining a target display area occupied by the black display area according to the determined position of the target pixel belonging to the black display area in the image to be displayed.

6. The method of claim 4, wherein before determining whether a black display area exists in the image to be displayed corresponding to the image data signal, further comprising:

determining the display resolution of the display screen and the type of the image data signal;

determining the first detection area and the second detection area in the image to be displayed according to the display resolution of the display screen and the type of the image data signal;

the first detection area comprises a first upper edge detection area, a first lower edge detection area, a first left edge detection area and a first right edge detection area; the second detection area includes a second upper edge detection area, a second lower edge detection area, a second left edge detection area, and a second right edge detection area.

7. The method of claim 6, wherein traversing the pixels in the second detection area to determine a target pixel in the black display area among the pixels in the second detection area comprises:

when a black display area exists in the first upper edge detection area and the first lower edge detection area, traversing each row of pixels in the second upper edge detection area and the second lower edge detection area, and if the ratio of the number of the continuously distributed black pixels in the currently traversed row of pixels to the total number of the pixels in the currently traversed row of pixels is greater than a preset threshold value, determining that the currently traversed row of pixels belongs to a target pixel in the black display area;

and traversing each column of pixels in the second left edge detection area and the second right edge detection area when the black display area exists in the first left edge detection area and the first right edge detection area, and determining that the currently traversed column of pixels belongs to the target pixel in the black display area if the ratio of the number of the continuously distributed black pixels in the currently traversed column of pixels to the total number of the pixels in the currently traversed column of pixels is greater than the preset threshold.

8. A display device, characterized in that the display device comprises:

a display screen;

9. The apparatus according to claim 8, wherein determining whether a black display area exists in the image to be displayed corresponding to the image data signal specifically includes:

10. The device according to claim 9, wherein the detecting whether the black display area exists in the first detection area in the image to be displayed specifically comprises: