CN114613327B - OLED display equipment and OLED display method - Google Patents

OLED display equipment and OLED display method Download PDF

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Publication number
CN114613327B
CN114613327B CN202210234104.3A CN202210234104A CN114613327B CN 114613327 B CN114613327 B CN 114613327B CN 202210234104 A CN202210234104 A CN 202210234104A CN 114613327 B CN114613327 B CN 114613327B
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image
attenuation
color channel
channel
equivalent
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CN114613327A (en
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张瑞吉
卢平光
何营昊
于新磊
刘芳
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Hisense Visual Technology Co Ltd
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Hisense Visual Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

The disclosure relates to OLED display equipment and an OLED display method, and relates to the technical field of display. The OLED display device includes: a controller configured to: acquiring an attenuation degree coefficient of a first color channel; according to the attenuation degree coefficient of the first color channel, counting the attenuation equivalent value of the first color channel in each pixel point after at least one frame of image is displayed in the first time period; calculating a ghost parameter according to the attenuation equivalent value of the first color channel in each pixel point; and a display configured to update the current background image to the target background image if the controller determines that the ghost parameter is greater than or equal to the preset parameter. The embodiment of the disclosure is used for solving the problems of the inflexibility and inflexibility of the anti-afterimage method.

Description

OLED display equipment and OLED display method
Technical Field
The disclosure relates to the technical field of display, in particular to an OLED display device and an OLED display method.
Background
The pixels of an Organic LIGHT EMITTING Diode (OLED) panel emit light using an organic light-emitting material, and the performance of the material is attenuated after a long time operation, which may result in a decrease in brightness of the pixels in the OLED panel. Luminance decay of an OLED screen is an inherent feature of current OLED screens. For the situation that the long-time display images are the same or similar, the brightness attenuation degree of some adjacent pixels in the OLED screen is different due to the fact that the long-time display contents are different, and the problem of the afterimage phenomenon can be caused visually.
The current anti-ghost method is a relatively simple way to perform pixel movement, for example, according to a fixed path and time interval, but is not intelligent and flexible because the method does not consider the actual image content.
Disclosure of Invention
In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides an OLED display device and an OLED display method, which can calculate a ghost parameter based on actual image content, and update a current background image to a target background image when it is determined that there is a ghost according to the ghost parameter, so that the ghost can be intelligently prevented in combination with the actual image.
In order to achieve the above object, the technical solution provided by the embodiments of the present disclosure is as follows:
in a first aspect, there is provided a display device including:
A controller configured to acquire a coefficient of attenuation degree of the first color channel;
According to the attenuation degree coefficient of the first color channel, counting the attenuation equivalent value of the first color channel in each pixel point after at least one frame of image is displayed in the first time period;
calculating a ghost parameter according to the attenuation equivalent value of the first color channel in each pixel point;
And the display is configured to update the current background image into the target background image under the condition that the ghost parameters are larger than or equal to preset parameters.
As an implementation of embodiments of the present disclosure in some embodiments, the controller is specifically configured to:
And calculating the average value and/or standard deviation of the attenuation equivalent values of the first color channels of all the pixel points according to the attenuation equivalent values of the first color channels in each pixel point so as to obtain the ghost parameters of the first color channels.
As one implementation in some embodiments of the disclosure, the controller is specifically configured to:
calculating the equivalent gray scale value of each pixel point according to the attenuation equivalent value of the first color channel of each pixel point and the attenuation equivalent values of other color channels of each pixel point;
And calculating the average value and/or standard deviation of the equivalent gray scale values of all the pixel points according to the equivalent gray scale values of all the pixel points to obtain the residual image parameters.
As an implementation of embodiments of the present disclosure in some embodiments, the controller is specifically configured to:
Calculating the attenuation degree coefficient of the first color channel according to a preset duration, a preset brightness attenuation proportion of the first color channel and a first time interval;
And displaying at least one frame of image in the preset duration, wherein the first time interval is the duration of displaying each frame of image in the preset duration.
As an implementation of embodiments of the present disclosure in some embodiments, the controller is specifically configured to:
Calculating an equivalent time interval according to the first time interval, the current basic brightness of the display screen, the current peak control gain and the image brightness of each frame of image corresponding to the first color channel in the preset duration;
Calculating the attenuation degree coefficient of the first color channel according to the preset duration, the equivalent time interval and the preset brightness attenuation proportion of the first color channel;
And displaying at least one frame of image in the preset duration, wherein the first time interval is the duration of displaying each frame of image in the preset duration.
As an implementation of embodiments of the present disclosure in some embodiments, the controller is further configured to:
Determining the value of each color channel in each pixel point corresponding to the target background image based on the attenuation equivalent value of each color channel in each pixel point under the condition that the ghost parameter of the first color channel is larger than or equal to a preset parameter;
determining image data corresponding to the target background image according to the values of the color channels in the pixel points corresponding to the background image;
the display is specifically configured to: and updating the current background image into a target background image based on the image data.
As an implementation of embodiments of the present disclosure in some embodiments, the controller is further configured to:
Acquiring a target image in a preset image library, wherein the target image is an image with the maximum similarity parameter with the current background image;
And taking the target image as the target background image.
In a second aspect, an OLED display method is provided, including:
Acquiring an attenuation degree coefficient of a first color channel;
According to the attenuation degree coefficient of the first color channel, counting the attenuation equivalent value of the first color channel in each pixel point after at least one frame of image is displayed in the first time period;
calculating a ghost parameter according to the attenuation equivalent value of the first color channel in each pixel point;
And under the condition that the ghost parameters are larger than or equal to preset parameters, updating the current background image into the target background image.
As an implementation manner of embodiments of the present disclosure in some embodiments, the calculating, according to an attenuation equivalent value of the first color channel in each pixel, a ghost parameter includes:
And calculating the average value and/or standard deviation of the attenuation equivalent values of the first color channels of all the pixel points according to the attenuation equivalent values of the first color channels in each pixel point so as to obtain the ghost parameters of the first color channels.
As an implementation manner of embodiments of the present disclosure in some embodiments, the calculating, according to an attenuation equivalent value of the first color channel in each pixel, a ghost parameter includes:
calculating the equivalent gray scale value of each pixel point according to the attenuation equivalent value of the first color channel of each pixel point and the attenuation equivalent values of other color channels of each pixel point;
And calculating the average value and/or standard deviation of the equivalent gray scale values of all the pixel points according to the equivalent gray scale values of all the pixel points to obtain the residual image parameters.
As one implementation in some embodiments of the present disclosure, the obtaining the attenuation degree coefficient of the first color channel includes:
Calculating the attenuation degree coefficient of the first color channel according to a preset duration, a preset brightness attenuation proportion of the first color channel and a first time interval;
And displaying at least one frame of image in the preset duration, wherein the first time interval is the duration of displaying each frame of image in the preset duration.
As an implementation of the embodiments of the present disclosure in some embodiments, the obtaining the attenuation degree coefficient of the first color channel includes:
Calculating an equivalent time interval according to the first time interval, the current basic brightness of the display screen, the current peak control gain and the image brightness of each frame of image corresponding to the first color channel in the preset duration;
Calculating the attenuation degree coefficient of the first color channel according to the preset duration, the equivalent time interval and the preset brightness attenuation proportion of the first color channel;
And displaying at least one frame of image in the preset duration, wherein the first time interval is the duration of displaying each frame of image in the preset duration.
As an implementation of embodiments of the present disclosure in some embodiments, the OLED display method further includes:
Determining the value of each color channel in each pixel point corresponding to the target background image based on the attenuation equivalent value of each color channel in each pixel point under the condition that the ghost parameter of the first color channel is larger than or equal to a preset parameter;
determining image data corresponding to the target background image according to the values of the color channels in the pixel points corresponding to the background image;
and updating the current background image into a target background image based on the image data.
As an implementation of embodiments of the present disclosure in some embodiments, the OLED display method further includes:
Acquiring a target image in a preset image library, wherein the target image is an image with the maximum similarity parameter with the current background image;
And taking the target image as the target background image.
In a third aspect, the present disclosure provides a computer-readable storage medium comprising: the computer readable storage medium has stored thereon a computer program which when executed by a processor implements the OLED display method as shown in the implementation in the second aspect or any embodiment thereof.
In a fourth aspect, the present disclosure provides a computer program product comprising: the computer program product, when run on a computer, causes the computer to implement the OLED display method as shown in the implementation in the second aspect or any embodiment thereof.
The embodiment of the disclosure provides an OLED display device and an OLED display method, wherein the OLED display device comprises: a controller configured to acquire a coefficient of attenuation degree of a first color channel, wherein the first color channel is at least one of an R channel, a G channel, a B channel, and a W channel; according to the attenuation degree coefficient of the first color channel, counting the attenuation equivalent value of the first color channel in each pixel point after at least one frame of image is displayed in the first time period; calculating a ghost parameter according to the attenuation equivalent value of the first color channel in each pixel point; and a display configured to update the current background image to the target background image if the controller determines that the ghost parameter is greater than or equal to the preset parameter. According to the scheme, the attenuation equivalent value of the first color channel in each pixel point can be counted through the attenuation degree coefficient of the first color channel and at least one frame of image which is actually displayed, the ghost parameters are calculated according to the attenuation equivalent value, finally whether the OLED display equipment has the ghost or not is judged according to the ghost parameters, and when the existence of the ghost is determined, the ghost is prevented by replacing the background image. Because the ghost parameters are calculated based on the actual image content, and under the condition that the ghost exists according to the ghost parameters, the current background image is updated to be the target background image, and the intelligent and flexible ghost prevention of the actual image can be combined.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of a scene in some embodiments provided by embodiments of the present disclosure;
Fig. 2 is a block diagram of a configuration of a control apparatus 100 provided in an embodiment of the present disclosure;
fig. 3 is a hardware configuration block diagram of a display device 200 provided by an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a software configuration in a display device 200 of one or more embodiments provided by the present disclosure;
fig. 5 is a flowchart of a method for displaying an OLED according to an embodiment of the disclosure;
Fig. 6 is a second flowchart of a method for displaying an OLED according to an embodiment of the disclosure;
fig. 7 is a flowchart of a method for displaying an OLED according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a three-channel OLED screen provided by an embodiment of the present disclosure;
Fig. 9is a schematic diagram of a four-channel OLED screen according to an embodiment of the present disclosure;
FIG. 10 is a schematic diagram of calculating attenuation equivalent values of each color channel for a three-channel OLED screen according to an embodiment of the present disclosure;
FIG. 11 is a schematic diagram of calculating attenuation equivalent values of each color channel for a four-channel OLED screen according to an embodiment of the present disclosure;
FIG. 12 is a schematic diagram I of updating a current background image according to an embodiment of the present disclosure;
Fig. 13 is a schematic diagram ii of updating a current background image according to an embodiment of the disclosure;
fig. 14 is a schematic diagram III of updating a current background image according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
As shown in fig. 1, a schematic view of a scene in some embodiments provided by embodiments of the present disclosure. The user may operate the display device 200 through the smart device 300 or the control apparatus 100 to display a video image or a still image on the display device 200.
In some embodiments, the control apparatus 100 may be a remote control, and the communication between the remote control and the display device includes infrared protocol communication, bluetooth protocol communication, and wireless or other wired manner to control the display device 200. The user may control the display device 200 by inputting user instructions through keys on a remote control, voice input, control panel input, etc. In some embodiments, mobile terminals, tablet computers, notebook computers, and other smart devices may also be used to control the display device 200.
In some embodiments, the mobile terminal 300 may install a software application with the display device 200, implement connection communication through a network communication protocol, and achieve the purpose of one-to-one control operation and data communication. The audio/video content displayed on the mobile terminal 300 may also be transmitted to the display device 200, so that the display device 200 may also perform data communication with the server 400 through various communication modes. The display device 200 may be permitted to make communication connections via 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 device 200. The display device 200 may be a liquid crystal display, an OLED display, a projection display device. The display device 200 may additionally provide an intelligent network television function of a computer support function in addition to the broadcast receiving television function.
Fig. 2 exemplarily shows a block diagram of a configuration of the control apparatus 100 in accordance with an exemplary embodiment. As shown in fig. 2, the control device 100 includes a controller 110, a communication interface 130, a user input/output interface 140, a memory, and a power supply. The control apparatus 100 may receive an input operation instruction of a user and convert the operation instruction into an instruction recognizable and responsive to the display device 200, and function as an interaction between the user and the display device 200. The communication interface 130 is configured to communicate with the outside, and includes at least one of a WIFI chip, a bluetooth module, NFC, or an alternative module. The user input/output interface 140 includes at least one of a microphone, a touch pad, a sensor, keys, or an alternative module.
Fig. 3 shows a hardware configuration block diagram of the display device 200 in accordance with an exemplary embodiment. The display device 200 as shown in fig. 3 includes: a modem 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, memory, power supplies, and the like. The controller 250 includes a central processor, a video processor, an audio processor, a graphic processor, a RAM, a ROM, and first to nth interfaces for input/output. The display 260 in embodiments of the present disclosure may be an OLED display. The modem 210 receives broadcast television signals through a wired or wireless reception manner, and demodulates audio and video signals, such as EPG data signals, from a plurality of wireless or wired broadcast television signals. The detector 230 is used to collect signals of the external environment or interaction with the outside. The controller 250 and the modem 210 may be located in separate devices, i.e., the modem 210 may also be located in an external device to the main device in which the controller 250 is located, such as an external set-top box.
In some embodiments, the display device is a terminal device having a display function, such as a television, a mobile phone, a computer, a learning machine, and the like.
In some embodiments, the controller 250 calculates the attenuation equivalent value of the first color channel in each pixel after displaying at least one frame of image in the first duration according to the attenuation degree coefficient of the first color channel by acquiring the attenuation degree coefficient of the first color channel in combination with the actual display image; calculating the ghost parameters according to the attenuation equivalent values of the first color channels in each pixel point;
and a display 260 configured to update the current background image to the target background image in case the controller 250 determines that the ghost parameters of the first color channel are greater than or equal to the preset parameters.
Wherein the first color channel is any one of an R channel, a G channel, a B channel, and a W channel. Because the ghost parameters are calculated based on the actual image content, and under the condition that the ghost exists according to the ghost parameters, the current background image is updated to be the target background image, and the intelligent and flexible ghost prevention of the actual image can be combined.
In some embodiments, the average value and/or standard deviation of the attenuation equivalent values of the first color channel are the ghost parameters, and the controller 250 may calculate, according to the attenuation equivalent values of the first color channel in each pixel, the ghost parameters of the first color channel by: and calculating the average value and/or standard deviation of the attenuation equivalent values of the first color channels of all the pixel points according to the attenuation equivalent values of the first color channels in each pixel point so as to obtain the ghost parameters of the first color channels.
In some embodiments, the controller 205 calculates the ghost parameters of the first color channel according to the attenuation equivalent value of the first color channel in each pixel point by: calculating the equivalent gray scale value of each pixel point according to the attenuation equivalent value of the first color channel of each pixel point and the attenuation equivalent values of other color channels of each pixel point; and calculating the average value and/or standard deviation of the equivalent gray scale values of all the pixel points according to the equivalent gray scale values of all the pixel points to obtain the residual image parameters.
In some embodiments, the attenuation degree coefficient of the first color channel may be calculated by the actual time interval and the equivalent time interval, respectively:
Based on the actual time interval, the attenuation degree coefficient of the first color channel is calculated by the following steps: the controller 205 calculates a damping degree coefficient of the first color channel according to a preset duration, a preset brightness damping proportion of the first color channel and a first time interval; and displaying at least one frame of image in the preset duration, wherein the first time interval is the duration of displaying each frame of image in the preset duration.
Based on the equivalent time interval, the attenuation degree coefficient of the first color channel is calculated by the following steps: the controller 205 calculates an equivalent time interval according to the first time interval, the current basic brightness of the display screen, the current peak control gain and the image brightness of each frame of image corresponding to the first color channel in the preset duration; then calculating the attenuation degree coefficient of the first color channel according to the preset duration, the equivalent time interval and the preset brightness attenuation proportion of the first color channel; and displaying at least one frame of image in the preset duration, wherein the first time interval is the duration of displaying each frame of image in the preset duration.
In the disclosed embodiments, the target background image may be determined in a variety of ways. The target background image can be determined based on the attenuation equivalent values of the color channels in the pixel points, and the image can be selected from a preset image library.
In some embodiments, the target background image may be determined based on the attenuation equivalent values of the color channels in the pixel points, and the controller 205 may further determine, if the ghost parameter of the first color channel is greater than or equal to a preset parameter, a value of each color channel in the pixel points corresponding to the target background image based on the attenuation equivalent values of the color channels in the pixel points; determining image data corresponding to the target background image according to the values of the color channels in the pixel points corresponding to the background image; accordingly, the display 206 may update the current background image to the target background image based on the image data.
In some embodiments, an image may be selected from a library of preset pictures as the target background image. The controller 205 is further configured to: acquiring a target image in a preset image library, wherein the target image is an image with the maximum similarity parameter with the current background image; and taking the target image as the target background image.
In the above embodiment, when it is determined that the ghost exists according to the ghost parameter, the current background image is updated to the target background image, and the same content is not displayed on the OLED screen for a long time by replacing the background image, so that the phenomenon of ghost occurrence can be alleviated, and the service life of the ILED screen can be prolonged.
As shown in fig. 4, fig. 4 is a schematic view of a software configuration in a display device 200 according to one or more embodiments of the present disclosure, and as shown in fig. 4, the system is divided into four layers, an application layer (application layer) from top to bottom, an application framework layer (Application Framework layer (frame layer), a An Zhuoyun line layer (Android runtime) and a system library layer (system runtime layer), and a kernel layer. The kernel layer contains at least one of the following drivers: audio drive, display drive, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (e.g., fingerprint sensor, temperature sensor, pressure sensor, etc.), and power supply drive, etc. The OLED display method provided by the embodiment of the disclosure can be realized based on the display device.
The display device related in the embodiments of the present disclosure is an OLED display device, that is, a display device whose screen is an OLED screen. Luminance decay of an OLED screen is an inherent feature of current OLED products. The organic light-emitting material is adopted to emit light, and the performance of the material is attenuated after long-time working, so that the brightness of the pixel point is reduced. The adjacent pixels have different display contents for a long time, so that the brightness attenuation degree of the pixels is different, and the problem of the afterimage phenomenon is caused visually.
In terms of hardware, the degradation of the OLED is caused by the threshold voltage shift of the driving transistor, and an internal compensation circuit is used in the related art, and one compensation circuit is connected to each OLED, so that the current flowing through the OLED is not affected by the threshold voltage of the driving transistor by the compensation circuit. However, the improvement on the hardware level can lead to complex circuit, slow response speed, small compensation range, large circuit load, difficult integration on a substrate and high hardware manufacturing cost.
The related art anti-ghost method is a relatively simple manner in terms of software, for example, pixel movement is performed at fixed paths and fixed time intervals, but is not intelligent and flexible because the method does not consider actual image contents.
In order to solve the above problems, the present disclosure provides an OLED display device and an OLED display method, which can calculate a ghost parameter based on an actual image content, and update a current background image to a target background image when it is determined that there is a ghost according to the ghost parameter, so that the ghost can be intelligently prevented by combining with the actual image.
For a more detailed description of the present solution, the following description will be given by way of example with reference to fig. 5, and it will be understood that the steps involved in fig. 5 may include more steps or fewer steps when actually implemented, and the order between these steps may also be different, so as to enable the OLED display method provided in the embodiments of the present disclosure.
The OLED display method provided by the embodiment of the disclosure is realized through an OLED display device or a functional module or a functional entity in the OLED display device. Wherein, the OLED display device may include: television, computer, tablet computer, learning machine, mobile phone, intelligent wearing equipment, etc. Wherein, intelligent wearing equipment can include intelligent wrist-watch, intelligent bracelet, intelligent glasses etc..
As shown in fig. 5, a method flowchart of an OLED display method according to an embodiment of the disclosure is shown, and the method includes the following steps S501 to S504:
S501, acquiring a damping degree coefficient of a first color channel.
Wherein the first color channel is at least one of an R (red) channel, a G (green) channel, a B (blue) channel, and a W (white) channel.
In some embodiments, in conjunction with fig. 5, as shown in fig. 6, the manner of obtaining the attenuation degree coefficient of the first color channel in 501 in fig. 5 may be implemented by step S5011:
s5011, calculating the attenuation degree coefficient of the first color channel according to the preset duration, the preset brightness attenuation proportion of the first color channel and the first time interval.
At least one frame of image is displayed in a preset time period, and the first time interval is the time period of displaying each frame of image in the preset time period.
In some embodiments, the attenuation program coefficient may be calculated according to the preset duration, the preset luminance attenuation ratio of the first color channel, and the first time interval, and the following formula (1):
f(t)＝(1–a％)*t/Ta (1)
Wherein f (t) represents the attenuation degree coefficient, the preset duration is represented as Ta, the first time interval is t, and the brightness attenuation proportion a% is preset. And displaying at least one frame of image when the attenuation degree coefficient is determined within the preset duration Ta, and recording the total time Ta when the brightness of the OLED screen is attenuated to a%, wherein t is the duration of displaying each frame of image within the preset duration.
In the above manner, when the attenuation degree coefficient is calculated, the attenuation degree coefficient corresponding to each color channel can be obtained by calculating the attenuation degree coefficient according to the above manner for each color channel.
Wherein the value of Ta may be different for each channel, and the value of a% may be different.
In some embodiments, in conjunction with fig. 5, as shown in fig. 7, the above 501 in fig. 5 may be implemented by the following step S5012:
S5012, calculating an equivalent time interval according to the first time interval, the current basic brightness of the display screen, the current peak control gain and the image brightness of each frame of image corresponding to the first color channel in the preset time period.
F (t) represents the attenuation degree coefficient, the preset duration is represented as Ta, the first time interval is t, and the brightness attenuation proportion a% is preset. And displaying at least one frame of image when the attenuation degree coefficient is determined within the preset duration Ta, and recording the total time Ta when the brightness of the OLED screen is attenuated to a%, wherein t is the duration of displaying each frame of image within the preset duration.
At least one frame of image is displayed in a preset time period, and the first time interval is the time period of displaying each frame of image in the preset time period.
In the practical application process, the brightness attenuation of the OLED screen is influenced by other factors besides time. For example, the current screen basic brightness, the peak control gain, and the image brightness of each color channel corresponding to each frame of image within a preset time period. The peak control gain is used for dynamically adjusting the brightness of the picture according to the average gray-scale brightness of the picture, namely, different peak control gains are selected, and the brightness of the picture is different. The average gray scale luminance can be divided into 8 different luminance steps.
In the embodiment of the disclosure, the equivalent time interval is calculated by combining the factors, and the attenuation degree coefficient is further calculated, so that the calculated attenuation degree coefficient is more accurate by considering the influence of various factors on the brightness attenuation.
In some embodiments, the calculating the equivalent time interval according to the first time interval, the current basic brightness of the display screen, the current peak control gain, and the image brightness of each frame of image corresponding to the first color channel within the preset duration may specifically be: calculating an equivalent time interval according to a first time interval, the current basic brightness of a display screen, the current peak control gain and the image brightness of each frame of image corresponding to a first color channel in a preset duration, and the following formula (2):
T＝t*(L/Lmax) (2)
The current screen basic brightness is represented as L, the peak control gain is represented as p, the image brightness of each frame of image corresponding to each color channel in the preset time period is represented as g, and l=l×p×g, and Lmax is the maximum value of the product of the screen basic brightness, the peak control gain and the image brightness of each frame of image corresponding to each color channel in the preset time period.
In the above manner, when the attenuation degree coefficient is calculated, the attenuation degree coefficient corresponding to each color channel can be obtained by calculating the attenuation degree coefficient according to the above manner for each color channel. Wherein the value of Ta may be different for each channel, and the value of a% may be different.
S5013, calculating the attenuation degree coefficient of the first color channel according to the preset duration, the equivalent time interval and the preset brightness attenuation proportion of the first color channel.
The calculating the attenuation degree coefficient of the first color channel according to the preset duration, the equivalent time interval and the preset brightness attenuation proportion of the first color channel may specifically be: calculating the attenuation degree coefficient of the first color channel according to the preset duration, the equivalent time interval, the preset brightness attenuation proportion of the first color channel and the following formula (3):
f(T)＝(1–a％)*T/Ta (3)
wherein f (T) represents a decay degree coefficient, T represents an equivalent time interval, ta represents a preset duration, and a% represents a preset brightness decay proportion. Wherein, the formula (3) can be derived from the above formula (1) and formula (2).
Normally, the three-channel OLED screen can normally obtain the image brightness G of each color channel corresponding to each frame of image in the preset time period according to the image data (i.e., RGB data), but when calculating the image brightness G of each color channel corresponding to each frame of image in the preset time period, the four-channel OLED screen needs to convert the RGB data (i.e., the data of the R channel, the G channel and the B channel) into the data of four RGBW channels (i.e., the data of the R channel, the G channel, the B channel and the W channel) and then calculate the data. That is, g values of four channels RGBW can be finally obtained, and attenuation degree coefficients of the four channels RGBW can be calculated, respectively.
As shown in fig. 8, a schematic diagram of a three-channel OLED screen provided by an embodiment of the present disclosure is shown in fig. 9, and it can be seen that for a three-channel OLED screen, one pixel point includes one R channel, one G channel, and one B channel, and may also be considered as 3 sub-pixels, and for a four-channel OLED screen, one pixel point includes one R channel, one G channel, one B channel, and one W channel, and may also be considered as 4 sub-pixels.
In some embodiments, four channels of the RGBW four-color OLED screen adopt the same luminescent material, and red, green and blue colors are realized through the optical filters, and when the attenuation degree coefficient is calculated, three-channel data are firstly converted into four-channel data for post-processing. Since the input signal is RGB data, when the display panel is an RGBW pixel architecture, RGB to RGBW data conversion is required. Alternative methods (alternatives), enhancement methods (enhancements) and four-coefficient methods may be employed.
1) Substitution method
The three-channel data of the image output can be converted into four-channel data displayed on the screen end by using an alternative conversion formula, wherein the three-channel data of the image output are respectively represented as Ri, gi and Bi, and the four-channel data displayed on the screen end are respectively represented as Rp, gp, bp, wp data.
The substitution conversion formula is as follows:
wp=min { Ri, gi, bi }, i.e., wp is the minimum of Ri, gi, bi;
Rp＝Ri-Wp；
Gp＝Gi-Wp；
Bp＝Bi–Wp。
2) Enhancement method
The three-channel data of the image output can be converted into four-channel data displayed at the screen end by using an enhancement method conversion formula, wherein the three-channel data of the image output are respectively represented as Ri, gi and Bi, and the four-channel data displayed at the screen end are respectively represented as Rp, gp, bp, wp data.
The substitution conversion formula is as follows:
Wp=min { Ri, gi, bi }, i.e. the minimum of Ri, gi, bi;
Rp＝Ri*K-Wp；
Gp＝Gi*K-Wp；
Bp＝Bi*K-Wp；
where K is an enhancement coefficient, K may ensure that the newly calculated Rp, gp, bp do not have zero values. For example: k= (wp+a)/a, a=max { Ri, gi, bi }, a being the maximum value among Ri, gi, bi.
3) Four-coefficient method
The three-channel data of the image output can be converted into four-channel data displayed at the screen end by using an enhancement method conversion formula, wherein the three-channel data of the image output are respectively represented as Ri, gi and Bi, and the four-channel data displayed at the screen end are respectively represented as Rp, gp, bp, wp data.
The four-coefficient conversion formula is as follows:
Wp＝Ri*Kr+Gi*Kg+Bi*Kb
Rp＝Ri*KW-Wp；
Gp＝Gi*KW-Wp；
Bp＝Bi*KW-Wp；
Wherein Kr, kg, kb and KW are coefficients determined according to the hardware design condition of the actual OLED screen, and the coefficients may be constants, and specific numerical values thereof are not limited in the embodiment of the present disclosure.
S502, counting attenuation equivalent values of the first color channels in each pixel point after at least one frame of image is displayed in the first time period according to the attenuation degree coefficient of the first color channels.
At least one frame of image is displayed in the first time period, the attenuation degree coefficient is used for superposing the at least one frame of image, and the sub-attenuation equivalent value of the first color channel in each pixel point is used for counting the attenuation equivalent value of the first color channel in each pixel point after the at least one frame of image is displayed in the first time period. In the process of displaying at least one frame of image in the first duration, according to the attenuation degree coefficient, calculating corresponding sub-attenuation equivalent values of the first color channels of each frame of image, adding all at least one frame of image, and obtaining the attenuation equivalent values of the first color channels in each pixel point after adding the corresponding sub-attenuation equivalent values of the first color channels.
As shown in fig. 10, a schematic diagram of calculating attenuation equivalent values of each color channel for a three-channel OLED screen according to an embodiment of the present disclosure is shown. Assuming that the attenuation degree coefficients calculated for each frame of image, namely the R channel, the G channel and the B channel are all 0.1 in the calculation process, accumulating the 4 frames of images shown in fig. 10 can see that in the 1 st frame and the 3 rd frame of image display process, the R channel has attenuation, and the attenuation equivalent value is 0.1+0.1=0.2; accordingly, as for the 4-frame image of the G channel as shown in fig. 10, it can be seen that in the process of displaying the 1 st to 4 th frames of images, the G channel has attenuation, and the attenuation equivalent value thereof is 0.1+0.1+0.1+0.1=0.4; accordingly, it can be seen that for the 4-frame image of the B channel as shown in fig. 10, there is attenuation in each of the 1 st, 3 rd and 4 th frame images, and the attenuation equivalent value thereof is 0.1+0.1+0.1=0.3.
As shown in fig. 11, a schematic diagram of calculating attenuation equivalent values of each color channel for a four-channel OLED screen according to an embodiment of the present disclosure is shown. In the calculation process, assuming that the attenuation degree coefficients calculated for each frame of image, namely the R channel, the G channel, the B channel and the W channel are all 0.1, accumulating the 4 frames of images shown in fig. 11 can see that in the 1 st frame and the 3 rd frame of image display process, the R channel has attenuation, and the equivalent attenuation value is 0.1+0.1=0.2; accordingly, as for the 4-frame image of the G channel as shown in fig. 11, it can be seen that in the process of displaying the 1 st to 4 th frame images, the G channel has attenuation, and the attenuation equivalent value thereof is 0.1+0.1+0.1=0.4; accordingly, as for the 4-frame image of the B channel as shown in fig. 11, it can be seen that in the display process of the 1 st frame, the 3 rd frame and the 4 th frame images, the B channel has attenuation, and the attenuation equivalent value thereof is 0.1+0.1+0.1=0.3; accordingly, it can be seen that for the 4-frame image of the W channel as shown in fig. 11, there is attenuation in each of the 1 st, 3 rd and 4 th frame images, and the attenuation equivalent value thereof is 0.1+0.1+0.1=0.3.
S503, calculating the residual image parameters of the first color channel according to the attenuation equivalent values of the first color channel in each pixel point.
In some embodiments, calculating the ghost parameters of the first color channel according to the attenuation equivalent value of the first color channel in each pixel point includes: and calculating the average value and/or standard deviation of the attenuation equivalent values of the first color channels of all the pixel points according to the attenuation equivalent values of the first color channels in each pixel point so as to obtain the ghost parameters of the first color channels.
In the embodiment of the present disclosure, the image sticking parameters of each color channel may be calculated according to the method provided in the foregoing embodiment, so as to facilitate the subsequent determination of whether to perform image sticking prevention processing.
In some embodiments, calculating the ghost parameters of the first color channel according to the attenuation equivalent value of the first color channel in each pixel point includes: calculating the equivalent gray scale value of each pixel point according to the attenuation equivalent value of the first color channel of each pixel point and the attenuation equivalent values of other color channels of each pixel point; and calculating the average value and/or standard deviation of the equivalent gray scale values of all the pixel points according to the equivalent gray scale values of all the pixel points to obtain the residual image parameters.
Illustratively, the equivalent gray-scale value of each pixel is calculated according to the attenuation equivalent value of the first color channel of each pixel, the attenuation equivalent values of the other color channels of each pixel, and the following formula (4).
Gray＝Rx*Yr+Gx*Yg+Bx*Yb+Wx (4)
Wherein Gray represents an equivalent Gray-scale value, rx represents an attenuation equivalent value of an R channel, gx represents an attenuation equivalent value of a G channel, bx represents an attenuation equivalent value of a B channel, wx represents an equivalent Gray-scale value of a W channel, yr=0.299, yg=0.587, yb=0.114. For a three-channel OLED screen, wx in equation (4) above is 0.
S504, under the condition that the ghost parameters are larger than or equal to preset parameters, updating the current background image into the target background image.
The target background image may be an image different from the current background image.
The ghost parameters may be calculated for any color channel (i.e., the first color channel) or for all color channels.
In some embodiments, the current background image may be updated to the target background image if the ghost parameters of the first color channel are greater than or equal to the preset parameters.
In some embodiments, the current background image may be updated to the target background image when the ghost parameters of two or more color channels are greater than or equal to the preset parameters.
The embodiment of the disclosure provides an OLED display device and an OLED display method, wherein the OLED display device comprises: a controller configured to acquire a attenuation degree coefficient of a first color channel, wherein the first color channel is any one of an R channel, a G channel, a B channel, and a W channel; according to the attenuation degree coefficient of the first color channel, counting the attenuation equivalent value of the first color channel in each pixel point after at least one frame of image is displayed in the first time period; calculating a ghost parameter according to the attenuation equivalent value of the first color channel in each pixel point; and a display configured to update the current background image to the target background image if the controller determines that the ghost parameter is greater than or equal to the preset parameter. According to the scheme, the attenuation equivalent value of the first color channel in each pixel point can be counted through the attenuation degree coefficient of the first color channel and at least one frame of image which is actually displayed, the ghost parameters are calculated according to the attenuation equivalent value, finally whether the OLED display equipment has the ghost or not is judged according to the ghost parameters, and when the existence of the ghost is determined, the ghost is prevented by replacing the background image. Because the ghost parameters are calculated based on the actual image content, and under the condition that the ghost exists according to the ghost parameters, the current background image is updated to be the target background image, and the intelligent and flexible ghost prevention of the actual image can be combined.
It should be noted that, the background image is a default display image set by the display device, and generally, the background image will be displayed for a long period after the display device is turned on, and if the same background image is displayed for a long period, serious afterimage problem will be caused.
In some embodiments, under the condition that the existence of the ghost is determined according to the ghost parameters, the current background image is updated to be the target background image, and the background image can be replaced to enable the OLED screen not to display the same content for a long time, so that the phenomenon of the ghost can be relieved, and the service life of the ILED screen can be prolonged.
In some embodiments, under the condition that the ghost parameter is greater than or equal to a preset parameter, determining the value of each color channel in each pixel point corresponding to the target background image based on the attenuation equivalent value of each color channel in each pixel point; determining image data corresponding to the target background image according to the values of the color channels in the pixel points corresponding to the target background image; the current background image is updated to the target background image based on the image data.
For an exemplary RGB three-channel OLED screen, assuming that the attenuation equivalent value of the R channel is 0.2, the attenuation equivalent value of the G channel is 0.4, and the attenuation equivalent value of the B channel is 0.2 in one pixel, then the value of the R channel corresponding to the corresponding pixel in the target background image is 255 (1-0.2) =204; the value of the G channel corresponding to the corresponding pixel point in the target background image is 255 (1-0.4) =153; the value of the B channel corresponding to the corresponding pixel point in the target background image is 255 (1-0.2) =204.
For the RGBW four-channel OLED screen, when determining the values of the color channels in each pixel point corresponding to the target background image based on the attenuation equivalent values of the color channels in each pixel point, the RGBW four-channel attenuation equivalent values can be converted into the RGB three-channel attenuation equivalent values, and the specific conversion mode can be 1) the substitution method, 2) the enhancement method or 3) the inverse conversion mode of the four-coefficient method.
Through the above embodiment, as shown in fig. 12, a schematic diagram of updating a current background image provided in the embodiment of the present disclosure may first obtain attenuation equivalent values of each color channel in each pixel point in an OLED screen through calculation for the OLED screen, and then calculate a value of each color channel in a target background image based on the attenuation equivalent values of each color channel in each pixel point in the OLED screen, so as to generate a frame of target background image based on the value of each color channel in the target background image. When the target background image is generated, the attenuation equivalent value of each color channel in each pixel point in the OLED screen is considered, so that the color value of the generated target background image can prevent further attenuation. Further, after the frame target background image is generated, the frame target background image may be used to replace the current background image of the OLED screen so that the OLED screen does not display the current background image for a long time, and further attenuation of the OLED screen is prevented by being replaced with the target background image.
In some embodiments, a target image is acquired from a preset image library, the target image is an image with the maximum similarity parameter with the current background image, and the target image is taken as the target background image. As shown in fig. 13, in a second schematic diagram for updating a current background image provided in an embodiment of the present disclosure, pictures in a preset picture library may be respectively compared with the current background image, a similarity parameter is calculated, a target image with the maximum similarity parameter is selected from the preset picture library, and the target image is used as a target background image to replace the current background image, so that the OLED screen will not display the current background image for a long time, and further attenuation of the OLED screen is prevented by replacing the current background image with the target image.
In the above embodiment, the image with the largest similarity parameter with the current background image is taken as the target background image, and compared with the image generated according to the attenuation equivalent value as the target background image, the image which is more beautiful and meets the requirements of the user can be obtained. Because the generated background image is not a product of normal aesthetic sense of people generally, contents such as characters, scenery and the like cannot be formed, the user experience is poor, and based on the user experience, the image with the maximum similarity parameter with the current background image in the preset picture library is selected as the target background image, so that the user satisfaction is greatly improved.
In some embodiments, as shown in fig. 14, a third schematic diagram for updating a current background image provided in the embodiments of the present disclosure may determine, based on attenuation equivalent values of each color channel in each pixel point, values of each color channel in each pixel point corresponding to a generated background image when a ghost parameter is greater than or equal to a preset parameter; determining to generate a background image according to the values of the color channels in the pixel points corresponding to the generated background image; further, a target image is obtained from a preset image library, and the target image is an image with the largest comprehensive similarity parameter of the background image and the current background image in the preset image library, wherein the comprehensive similarity is the sum of a first similarity parameter and a second similarity parameter, the first similarity parameter is used for representing the similarity between the generated background image and the target image, and the second similarity parameter is used for representing the similarity between the current background image and the target image.
In the above embodiment, the target image with the largest comprehensive similarity parameter is used as the target background image, that is, the target image is used to replace the current background image of the OLED screen, so that compared with the image generated according to the attenuation equivalent value as the target background image, the image which is more aesthetic and meets the requirements of the user can be obtained. Compared with the method that the image which is most similar to the current background image is used as the target background image, the method and the device have the advantages that a better image sticking prevention effect can be achieved, and through the scheme of the embodiment, the background image which is more attractive in display, meets the requirements of users and has the better image sticking prevention effect can be achieved.
In some embodiments, when the ghost parameter is greater than or equal to the preset parameter, the value of each color channel in each pixel corresponding to the generated background image may be determined based on the attenuation equivalent value of each color channel in each pixel; determining to generate a background image according to the values of the color channels in the pixel points corresponding to the generated background image; further, the target image may be obtained from a preset image library, where the target image is an image with the largest similarity parameter with the generated background image in the preset image library. And replacing the current background image of the OLED screen by taking the acquired target image as a target background image.
In the above embodiment, since the generated background image determined according to the attenuation equivalent value does not conform to aesthetic habits of people, the image most similar to the generated background image in the preset picture library is used as the target background image, so that a better anti-afterimage effect can be achieved, and aesthetic feeling can be achieved.
The embodiments of the present disclosure provide a computer readable storage medium, on which a computer program is stored, where the computer program when executed by a processor implements each process executed by the above OLED display method, and the same technical effects can be achieved, and for avoiding repetition, a detailed description is omitted herein.
The computer readable storage medium may be a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk.
The present disclosure provides a computer program product, comprising: the computer program product, when run on a computer, causes the computer to implement the above-described OLED display method.
The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. The above discussion in some examples is 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 (7)

1. An OLED display device, comprising:
a controller configured to: calculating an equivalent time interval according to the first time interval, the current basic brightness of the display screen, the current peak control gain and the image brightness of each frame of image corresponding to the first color channel in the preset duration;
Calculating the attenuation degree coefficient of the first color channel according to the preset duration, the equivalent time interval and the preset brightness attenuation proportion of the first color channel; or the controller is specifically configured to: calculating the attenuation degree coefficient of the first color channel according to a preset duration, a preset brightness attenuation proportion of the first color channel and a first time interval;
According to the attenuation degree coefficient of the first color channel, counting the attenuation equivalent value of the first color channel in each pixel point after at least one frame of image is displayed in the first time period;
calculating a ghost parameter according to the attenuation equivalent value of the first color channel in each pixel point;
the controller is further configured to: determining the value of each color channel in each pixel point corresponding to the target background image based on the attenuation equivalent value of each color channel in each pixel point under the condition that the ghost parameter of the first color channel is larger than or equal to a preset parameter;
determining image data corresponding to the target background image according to the values of all color channels in all pixel points corresponding to the target background image;
a display specifically configured to: updating the current background image to a target background image based on the image data;
Wherein the first color channel is at least one of a red channel, a green channel, a blue channel and a white channel; and displaying at least one frame of image in the preset time, wherein the first time interval is the time for displaying each frame of image in the preset time.
2. The OLED display device according to claim 1, wherein the controller is specifically configured to:
And calculating the average value and/or standard deviation of the attenuation equivalent values of the first color channels of all the pixel points according to the attenuation equivalent values of the first color channels in each pixel point so as to obtain the ghost parameters.
3. The OLED display device according to claim 1, wherein the controller is specifically configured to:
calculating the equivalent gray scale value of each pixel point according to the attenuation equivalent value of the first color channel of each pixel point and the attenuation equivalent values of other color channels of each pixel point;
And calculating the average value and/or standard deviation of the equivalent gray scale values of all the pixel points according to the equivalent gray scale values of all the pixel points to obtain the residual image parameters.
4. The OLED display device of any one of claims 1-3, wherein the controller is further configured to:
Acquiring a target image in a preset image library, wherein the target image is an image with the maximum similarity parameter with the current background image;
And taking the target image as the target background image.
5. An OLED display method, comprising:
Calculating an equivalent time interval according to the first time interval, the current basic brightness of the display screen, the current peak control gain and the image brightness of each frame of image corresponding to the first color channel in the preset duration; wherein the first color channel is at least one of an R channel, a G channel, a B channel and a W channel; displaying at least one frame of image in the preset duration, wherein the first time interval is the duration of displaying each frame of image in the preset duration;
Calculating the attenuation degree coefficient of the first color channel according to the preset duration, the equivalent time interval and the preset brightness attenuation proportion of the first color channel; or calculating the attenuation degree coefficient of the first color channel according to the preset duration, the preset brightness attenuation proportion of the first color channel and the first time interval;
According to the attenuation degree coefficient of the first color channel, counting the attenuation equivalent value of the first color channel in each pixel point after at least one frame of image is displayed in the first time period;
calculating a ghost parameter according to the attenuation equivalent value of the first color channel in each pixel point;
Determining the value of each color channel in each pixel point corresponding to the target background image based on the attenuation equivalent value of each color channel in each pixel point under the condition that the ghost parameter of the first color channel is larger than or equal to a preset parameter;
determining image data corresponding to the target background image according to the values of all color channels in all pixel points corresponding to the target background image;
and updating the current background image into a target background image based on the image data.
6. The method of claim 5, wherein calculating the ghost parameters based on the attenuation equivalent values of the first color channel in each pixel comprises:
And calculating the average value and/or standard deviation of the attenuation equivalent values of the first color channels of all the pixel points according to the attenuation equivalent values of the first color channels in each pixel point so as to obtain the ghost parameters of the first color channels.
7. The method of claim 5, wherein calculating the ghost parameters based on the attenuation equivalent values of the first color channel in each pixel comprises:
calculating the equivalent gray scale value of each pixel point according to the attenuation equivalent value of the first color channel of each pixel point and the attenuation equivalent values of other color channels of each pixel point;
And calculating the average value and/or standard deviation of the equivalent gray scale values of all the pixel points according to the equivalent gray scale values of all the pixel points to obtain the residual image parameters.
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