KR102271721B1 - System for cloud streaming service, method of image cloud streaming service considering terminal performance and apparatus for the same - Google Patents

Abstract

A cloud streaming service system, an image cloud streaming service method in consideration of terminal performance, and an apparatus therefor are disclosed. When the cloud streaming server detects a change area from the web application execution screen, receives performance information from the user terminal to generate an animation message, and transmits the animation message to the user's terminal device, the terminal device applies animation to the captured image, A more stable cloud streaming service can be provided by enabling a still image-based cloud streaming service to be performed.

Description

Cloud streaming service system, image cloud streaming service method considering terminal performance, and device therefor

The present invention relates to an image cloud streaming service technology in consideration of terminal performance, and in particular, a cloud streaming service that generates an animation message in consideration of performance information received from a user terminal, thereby stably generating a web application execution result screen in a user terminal It relates to an image cloud streaming service method in consideration of system and terminal performance, and an apparatus therefor.

Due to the recent development of the Internet, the speed of communication using personal mobile communication devices has rapidly improved, and based on this, an Internet environment such as downloading and uploading large amounts of data through remote computer access or logging into a remote computer locally is created. became In addition, as applications driven in a mobile communication terminal such as a smart phone are developed in various ways, virtualization technologies for driving applications requiring high performance in a user terminal with relatively low performance have been widely proposed. Among them, a screen virtualization base that runs an application on the server, compresses the driving screen through video encoding, and transmits it to the client, and the client plays the transmitted video to have the same effect as if the application is running on its own terminal. of cloud streaming services are in the spotlight.

This cloud streaming service basically applies a video codec-based cloud streaming technique, but even when a service such as a menu display is provided, the entire screen is unnecessarily captured and operated using the video codec, resulting in inefficiency of the system as a whole. exist.

Therefore, by generating a captured image for a part that requires a dynamic effect such as animation among the execution result screen of the application executed by the user's request, and transmitting the captured image and animation related information to the user's set-top box, animation in the set-top box A technology that can create a service screen with effects applied is urgently emerging.

Korean Patent Laid-Open Patent No. 10-2012-0096909, published on August 31, 2012 (Name: Merge gateway/set-top box image for delivery to a serviced client device)

An object of the present invention is to determine an animation variable value in consideration of the performance information of the set-top box in the cloud streaming server, and generate an animation message according to this and transmit it to the set-top box, using the variable value in consideration of the performance information in the set-top box to provide a more stable cloud streaming service by creating animations.

In addition, an object of the present invention is to capture only a part of the web application execution screen in the cloud streaming server, generate a message having animation information to be applied to the corresponding area, and transmit the captured image and message to the set-top box, the message from the set-top box By using animation to apply animation to captured images, unnecessary animation processing is reduced and the number of web containers that can be run on the server is increased.

Cloud streaming server according to the present invention for achieving the above object, a screen receiving unit for receiving a web application execution screen from the web application server; a change region detection unit that compares a current frame with a previous frame included in the web application execution screen to determine a change region of the current frame changed from the previous frame; a performance information receiving unit for receiving performance information of the user terminal from the user terminal; an animation message generator configured to generate an animation message including a variable value determined in consideration of the animation information applied to the change region and the performance information; and a sending unit that transmits the animation message to the user terminal so that the user terminal can generate the web application execution screen to perform a still image-based cloud streaming service.

At this time, the cloud streaming server includes: a capture unit for generating a captured image from any one of the frames within the change area; and an encoding unit for encoding the still image by using a still image compression technique, wherein the sending unit applies the animation information and variable values included in the animation message to the captured image in the user terminal to the web The animation message and the still image-encoded captured image may be transmitted to the user terminal to generate an application execution screen.

In this case, the animation message generator may determine the number of intermediate frames per unit time for displaying the animation applied to the change region as the variable value.

In this case, the animation message generator may determine that the number of intermediate frames per unit time increases as the performance of the central processing unit of the user terminal included in the performance information increases.

In this case, the animation message generator may determine that the number of intermediate frames per unit time increases as the available memory of the user terminal included in the performance information increases.

In this case, the performance information may include any one or more of a user terminal model name, a user terminal identifier, central processing unit (CPU) performance, and available memory.

In this case, the animation message may include animation information corresponding to at least one of an animation type, animation application time, animation repetition number, start coordinates, end coordinates, start size, and end size.

In addition, the image cloud streaming service method in consideration of the terminal performance according to the present invention comprises the steps of: receiving a web application execution screen from a web application server; determining a change region of the current frame changed from the previous frame by comparing the current frame with the previous frame included in the web application execution screen; Receiving performance information of the user terminal from the user terminal; generating an animation message including a variable value determined in consideration of the animation information applied to the change region and the performance information; and transmitting the animation message to the user terminal so that the user terminal can generate the web application execution screen to perform a still image-based cloud streaming service.

At this time, the image cloud streaming service method in consideration of the terminal performance comprises the steps of: generating a captured image from any one of the frames in the change area; and encoding the still image by using a still image compression technique, wherein the performing the still image-based cloud streaming service includes the animation included in the animation message in the captured image in the user terminal. The animation message and the still image-encoded captured image may be transmitted to the user terminal to generate the web application execution screen by applying information and variable values.

In this case, the generating of the animation message may determine the number of intermediate frames per unit time for displaying the animation applied to the change region as the variable value.

In this case, the generating of the animation message may determine that the higher the performance of the central processing unit of the user terminal included in the performance information, the greater the number of intermediate frames per unit time.

In this case, the generating of the animation message may determine that the number of intermediate frames per unit time increases as the available memory of the user terminal included in the performance information increases.

In this case, the performance information may include any one or more of a user terminal model name, a user terminal identifier, central processing unit (CPU) performance, and available memory.

In this case, the animation message may include animation information corresponding to at least one of an animation type, animation application time, animation repetition number, start coordinates, end coordinates, start size, and end size.

According to the present invention, when an animation variable value is determined in consideration of the performance information of the set-top box in the cloud streaming server, and an animation message is generated and transmitted to the set-top box according to this, the set-top box uses the variable value in consideration of the performance information. By creating animation, it is possible to provide a more stable cloud streaming service.

In addition, the present invention captures only a part of the web application execution screen in the cloud streaming server, generates a message having animation information to be applied to the corresponding area, and transmits the captured image and message to the set-top box, using the message in the set-top box. By animating the captured image, it is possible to reduce unnecessary animation processing and increase the number of web containers that can be run on the server.

1 is a block diagram showing a cloud streaming service system according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating an example of the cloud streaming server shown in FIG. 1 .
3 is a diagram illustrating a process of performing a cloud streaming service based on a still image according to an embodiment of the present invention.
4 is a table showing the relationship between performance information and animation variable values according to an embodiment of the present invention.
5 is an operation flowchart illustrating an image cloud streaming service method in consideration of terminal performance according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, detailed descriptions of well-known functions or configurations that may obscure the gist of the present invention in the following description and accompanying drawings will be omitted. Also, it should be noted that throughout the drawings, the same components are denoted by the same reference numerals as much as possible.

The terms or words used in the present specification and claims described below should not be construed as being limited to their ordinary or dictionary meanings, and the inventor is appropriate as a concept of terms for describing his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined in Accordingly, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all of the technical spirit of the present invention. It should be understood that there may be equivalents and variations. In addition, terms such as first, second, etc. are used to describe various components, and are used only for the purpose of distinguishing one component from other components, and are not used to limit the components.

1 is a block diagram showing a cloud streaming service system according to an embodiment of the present invention.

Referring to FIG. 1 , the cloud streaming service system according to an embodiment of the present invention includes a web application server 105 , a cloud streaming server 110 , terminal devices 120-1, ..., 120-N, and a network 130 . ) is included.

Cloud streaming server 110 receives the application result execution screen from the web application server (105).

In addition, the cloud streaming server 110 determines a change region of the current frame changed from the previous frame by comparing the current frame with the previous frame included in the web application execution screen. In this case, the change area may be a menu area overlappingly displayed on the main screen among the web application execution screens.

In addition, the cloud streaming server 110 receives the performance information of the user terminal from the user terminal. In this case, the performance information may include any one or more of a user terminal model name, a user terminal identifier, central processing unit (CPU) performance, and available memory.

In addition, the cloud streaming server 110 generates an animation message including the variable value determined in consideration of the animation information and performance information applied to the change area. In this case, the animation message may include an animation type for determining the type of animation. For example, the animation message may include an animation type corresponding to any one of flying up, brightness change, rising, and wiping. Also, the animation message may include animation information corresponding to at least one of an animation type, an animation application time, an animation repetition number, start coordinates, end coordinates, a start size, and an end size. In this case, the variable value may be, for example, the number of intermediate frames per unit time for displaying the animation applied to the change region.

At this time, the cloud streaming server 110 may determine the number of intermediate frames per unit time for displaying the animation applied to the change area in consideration of the performance information. In this case, it is determined so that the higher the performance of the central processing unit of the user terminal included in the performance information, the greater the number of intermediate frames per unit time, and the larger the available memory, the greater the number of intermediate frames per unit time.

In addition, the cloud streaming server 110 generates a captured image from any one of the frames in the change area. In this case, the captured image may be an image corresponding to the first frame or the last frame among the frames in the change region.

Also, the cloud streaming server 110 encodes the captured image as a still image using a still image compression technique. In this case, the captured image may be encoded as a still image by using a still image compression technique corresponding to any one of portable network graphics (PNG), paletted portable network graphics (PNG), and joint photography experts group (JPEG).

In addition, the cloud streaming server 110 transmits the still image-encoded captured image and animation message to the user terminal so as to generate a web application execution screen in the terminal devices 120-1, ..., 120-N, and transmits the still image to the user terminal. based cloud streaming service.

The terminal devices 120-1, ..., 120-N provide performance information to the cloud streaming server 110, and receive an application execution result screen corresponding to the cloud streaming service from the cloud streaming server 110 to the user. to provide.

Each of the terminal devices 120-1, ..., 120-N is connected to a communication network and is a device capable of executing an application based on a cloud computing system, and is not limited to a mobile communication terminal, and all information and communication devices, multimedia terminals, and wired It may be various terminals such as a terminal, a fixed terminal, and an IP (Internet Protocol) terminal. In addition, the terminal devices 120-1, ..., 120-N are, respectively, a mobile phone, a Portable Multimedia Played (PMP), a Mobile Internet Device (MID), a smart phone, a desktop, and a tablet computer. PC), a notebook (Notebook), a netbook (Net Book), a personal digital assistant (PDA), may be a mobile (Mobile) terminal having various mobile communication specifications, such as a smart TV and information communication device.

The web application server 105 is a server that receives and processes requests from the terminal devices 120-1, ..., 120-N. Rather than processing all the requests received from the terminal devices 120-1, ..., 120-N in the web application server 105, the functions of the web application server 105 can be structurally separated and processed through web containers. Therefore, as the number of service requests from the terminal devices 120-1, ..., 120-N increases, a service method using the web application server 105 may be more effective. For example, BEA's WEB LOGIC, IBM's Web Spere, T-max's JEUS, Tomcat, RedHot's Jboss, etc. may correspond to the web application server 105 .

The application server 105 may transmit a web application execution screen to the cloud streaming server 110 based on the service request received from the terminal devices 120-1, ..., 120-N.

The network 130 provides a path for transferring data between the cloud streaming server 110 and the terminal devices 120-1, ..., 120-N, and includes both an existing network and a network that can be developed in the future. It is an inclusive concept. For example, the network 130 is a wired/wireless local area network that provides communication of various information devices within a limited area, a mobile communication network that provides communication between mobile devices and between the mobile body and the outside of the mobile body, and communication between the earth station and the earth station using satellites. It may be any one of a satellite communication network or a wired/wireless communication network that provides Meanwhile, the transmission method standard of the network 130 is not limited to the existing transmission method standard, and may include all transmission method standards to be developed in the future. In addition, in FIG. 1 , the network used between the cloud streaming server 110 and the terminal devices 120-1, ..., 120-N is used between the terminal devices 120-1, ..., 120-N. It may be different from the network, or it may be the same.

FIG. 2 is a block diagram illustrating an example of the cloud streaming server shown in FIG. 1 .

Referring to FIG. 2 , the cloud streaming server shown in FIG. 1 includes a screen receiving unit 210 , a change region detecting unit 220 , a performance information receiving unit 230 , an animation message generating unit 240 , a capturing unit 250 , and encoding. It includes a unit 260 , a sending unit 270 , and a storage unit 280 .

The screen receiving unit 210 receives a web application execution screen from the web application server. Such a web application execution screen may include a main screen and a menu area superimposed on the main screen.

The change region detection unit 220 determines the change region of the current frame changed from the previous frame by comparing the current frame with the previous frame included in the web application execution screen. In this case, the change area may be a menu area overlappingly displayed on the main screen among the web application execution screens.

The performance information receiving unit 230 receives the performance information of the user terminal from the user terminal. In this case, the performance information may include any one or more of a user terminal model name, a user terminal identifier, central processing unit (CPU) performance, and available memory.

The animation message generator 240 generates an animation message including variable values determined in consideration of animation information and performance information applied to the change region. In this case, the animation message may include an animation type for determining the type of animation. For example, the animation message may include an animation type corresponding to any one of flying up, brightness change, rising, and wiping. Also, the animation message may include animation information corresponding to at least one of an animation type, an animation application time, an animation repetition number, start coordinates, end coordinates, a start size, and an end size. Also, the animation message may include an animation application time.

At this time, the start coordinate is the animation start coordinate of the video object to which the animation is applied, the end coordinate is the animation end coordinate of the video object to which the animation is applied, the start size is the animation start size of the video object to which the animation is applied, and the end size is the animation end size of the video object to which the animation is applied.

For example, the animation type is 'effect type', the animation application time is 'duration', the number of animation repetitions is 'isRepeat', the start coordinate is 'start X, start Y', the end coordinate is 'end X, end Y', The start size may be expressed as 'start W, start H' and the end size may be expressed as 'end W, end H'.

In this case, the animation message generator 240 may determine the number of intermediate frames per unit time for displaying the animation applied to the change region in consideration of the performance information. In this case, it is determined so that the higher the performance of the central processing unit of the user terminal included in the performance information, the greater the number of intermediate frames per unit time, and the larger the available memory, the greater the number of intermediate frames per unit time.

For example, the user terminal may be classified into A type, B type, and C type according to the central processing unit performance of the user terminal included in the performance information, and the number of intermediate frames per unit time may be differently determined for each type. More specifically, as the performance of the central processing unit, if the operating clock number of the central processing unit corresponds to less than 1 GHz, type A, if it corresponds to 1Ghz or more and 10Ghz or less, type B, if it corresponds to more than 10Ghz, it can be classified as type C. In this case, the number of intermediate frames per unit time of 3 seconds for type A may be determined to be 3, for type B, 5, and for type C, 10 may be determined.

The capture unit 250 generates a captured image from any one of the frames in the change region. In this case, the captured image may be an image corresponding to the first frame or the last frame among the frames in the change region.

The encoding unit 260 encodes the captured image as a still image by using a still image compression technique. In this case, the captured image may be encoded as a still image by using a still image compression technique corresponding to any one of portable network graphics (PNG), paletted portable network graphics (PNG), and joint photography experts group (JPEG).

The PNG still image compression technique has good image quality during encoding, but the transmission speed may be lowered when the bandwidth of the transmission network is low due to the large data size.

The paletted PNG still image compression technique reduces the data size of the image during encoding, so the transmission speed can be guaranteed, but since the color is expressed in 8 bits, it can cause deterioration in image quality.

Since the JPEG still image compression technique has good compression efficiency, the amount of transmitted data can be greatly reduced during encoding. However, since the compression efficiency is high, it can generate a lot of system load when encoding and decoding.

The sending unit 270 performs a still image-based cloud streaming service by transmitting a still image-encoded captured image and an animation message to the user terminal so that the user terminal can generate a web application execution screen. For example, the cloud streaming server 110 may completely generate and stream the application result screen, but the load generated in the cloud streaming server 110 by transmitting the application result screen to the user terminal in the same way as above. can be significantly reduced. As such, when the load of the cloud streaming server 110 is reduced, the number of services that can be simultaneously processed by the cloud streaming server 110 increases, so that more users can receive the service at the same time.

The storage unit 280 stores various information generated in the process of the cloud streaming service according to the embodiment of the present invention as described above.

According to an embodiment, the storage unit 280 may be configured independently of the cloud streaming server 110 to support a function for a cloud streaming service. In this case, the storage unit 280 may operate as a separate mass storage and may include a control function for performing an operation.

In addition, the cloud streaming server 110 configured as described above may be implemented as one or more servers.

On the other hand, the cloud streaming server 110 is equipped with a memory can store information in the device. For one implementation, the memory is a computer-readable medium. In one implementation, the memory may be a volatile memory unit, and in another implementation, the memory may be a non-volatile memory unit. In one embodiment, the storage device is a computer-readable medium. In various different implementations, the storage device may include, for example, a hard disk device, an optical disk device, or some other mass storage device.

3 is a diagram illustrating a process of performing a cloud streaming service based on a still image according to an embodiment of the present invention.

Referring to FIG. 3 , the process of performing a cloud streaming service based on a still image according to an embodiment of the present invention can be described by classifying it into a cloud streaming server area 300 , a terminal area 305 , and an application server area 310 . have.

First, a web application execution screen generated by executing the web application server based on a user's request in the cloud streaming server area 300 may be received 320 , and performance information may be received 325 from the user terminal device.

At this time, the cloud streaming server area 300 may detect a change area on the web application execution screen, generate a captured image for the change area, or generate an animation message (340). In this case, the animation message is generated in consideration of animation information and performance information applied to the change region.

In addition, in the cloud streaming server area 300 , the captured image and the animation message on which the encoding 330 is performed may be streamed 350 together to the terminal area 305 .

In the terminal area 305 , a web application execution screen may be generated using the captured image and the animation message received from the cloud streaming server area 300 . At this time, since the animation information includes information such as animation type, animation application time, animation repetition number, start coordinates, end coordinates, start size, and end size, it is possible to accurately and easily apply animation to the captured image and execute the web application. You can create a screen.

In the terminal area 305 , the web application execution screen generated as described above may be output to the user by performing image rendering 370 .

The application server area 310 receives the user's input signal, and transmits an output screen corresponding to the input signal to the cloud streaming server.

4 is a table showing the relationship between performance information and animation variable values according to an embodiment of the present invention.

Referring to FIG. 4 , it can be seen that, in the relationship between performance information and animation variable values according to an embodiment of the present invention, the unit time and the number of intermediate frames are determined for each type according to the number of operation clocks of the central processing unit.

That is, the cloud streaming server according to the present invention classifies the user terminal into type A, type B, and type C according to the number of operating clocks of the central processing unit of the user terminal included in the performance information, and unit time and intermediate frame for each type determine the number differently.

For example, when the operating clock number of the central processing unit corresponds to less than 1 GHz, it is classified as A type, when it corresponds to 1 Ghz or more and 10 Ghz or less, it is classified as B type, and when it corresponds to more than 10 Ghz, it is classified as C type. At this time, the unit time of each type is determined to be 3 seconds, and the number of intermediate frames per unit time is determined to be 3 in the case of A type, 5 in the case of the B type, and 10 in the case of the C type.

5 is a flowchart illustrating an image cloud streaming service method in consideration of terminal performance according to an embodiment of the present invention.

Referring to FIG. 5 , the image cloud streaming service method in consideration of terminal performance according to an embodiment of the present invention receives a web application execution screen from a web application server (S510).

In addition, the image cloud streaming service method in consideration of the terminal performance according to an embodiment of the present invention compares the current frame with the previous frame included in the web application execution screen to determine the change region of the current frame changed from the previous frame (S520) .

In addition, the image cloud streaming service method in consideration of the terminal performance according to an embodiment of the present invention receives the performance information of the user terminal from the user terminal (S530).

In addition, the image cloud streaming service method in consideration of the terminal performance according to an embodiment of the present invention generates an animation message including the variable values determined in consideration of the animation information and the performance information applied to the change area (S540).

In addition, the image cloud streaming service method in consideration of the terminal performance according to an embodiment of the present invention transmits an animation message to the user terminal so that the user terminal can generate a web application execution screen, a still image based cloud streaming service to perform (S550).

Steps S510 and S520 and S530 shown in FIG. 5 may be performed in the order shown in FIG. 5 , in the reverse order thereof, or simultaneously.

The image cloud streaming service method considering the terminal performance according to the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - Includes magneto-optical media, and any form of hardware device specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions may include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. Such hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, in the cloud streaming service system according to the present invention, the image cloud streaming service method in consideration of the terminal performance, and the apparatus therefor, the configuration and method of the embodiments described above are not limitedly applicable, but the above embodiment Examples may be configured by selectively combining all or part of each embodiment so that various modifications can be made.

According to the present invention, a captured image and an animation message are generated for an area where video codec-based cloud streaming is not appropriate and transmitted to the user, so that the user terminal can generate a web application execution result screen to which the animation is applied. Furthermore, by reducing unnecessary animation processing in the cloud streaming server, it is possible to increase the number of web containers that can be run in the cloud streaming server, thereby helping the convenience of the service provider.

105, 310: web application server 110, 300: cloud streaming server
120-1 to 120-N: terminal device 130: network
210: screen receiving unit 220: change area detection unit
230: performance information receiver 240: animation message generator
250: capture unit 260: encoding unit
270: sending unit 280: storage unit
305: user terminal

Claims (16)

a screen receiving unit for receiving a web application execution screen from a web application server;
a change region detection unit that compares a current frame with a previous frame included in the web application execution screen to determine a change region of the current frame changed from the previous frame;
a performance information receiving unit for receiving performance information of the user terminal from the user terminal;
an animation message generator configured to generate an animation message including a variable value determined in consideration of the animation information applied to the change region and the performance information; and
A sending unit that transmits the animation message to the user terminal so that the user terminal can generate the web application execution screen to perform a still image-based cloud streaming service
including,
The animation message generator
Cloud streaming server, characterized in that for determining the number of intermediate frames per unit time for displaying the animation applied to the change area as the variable value. The method according to claim 1,
The cloud streaming server
a capture unit generating a captured image from any one of the frames within the change region; and
An encoding unit that encodes the captured image as a still image using a still image compression technique
further comprising,
The sending part
The user terminal transmits the animation message and the still image-encoded captured image to the user terminal so as to generate the web application execution screen by applying the animation information and variable values included in the animation message to the captured image. Cloud streaming server, characterized in that. delete delete delete delete delete Receiving a web application execution screen from the web application server;
determining a change region of the current frame changed from the previous frame by comparing the current frame with the previous frame included in the web application execution screen;
Receiving performance information of the user terminal from the user terminal;
generating an animation message including variable values determined in consideration of animation information applied to the change region and the performance information; and
performing a still image-based cloud streaming service by transmitting the animation message to the user terminal so that the user terminal can generate the web application execution screen
including,
The step of generating the animation message is
Image cloud streaming service method in consideration of terminal performance, characterized in that determining the number of intermediate frames per unit time for displaying the animation applied to the change region as the variable value. delete delete delete delete delete delete delete Receives a web application execution screen from a web application server, compares a previous frame included in the web application execution screen with a current frame to determine a change region of the current frame changed from the previous frame, and from the user terminal to the user terminal Receive performance information, generate an animation message including animation information applied to the change region and variable values determined in consideration of the performance information, and generate the animation message so that the user terminal can generate the web application execution screen a cloud streaming server that transmits to the user terminal and performs a still image-based cloud streaming service; and
A terminal that transmits the performance information to the cloud streaming server, receives the animation message from the cloud streaming server, and provides a web application execution result screen corresponding to the still image-based cloud streaming service
including,
The cloud streaming server
Image cloud streaming service system considering terminal performance, characterized in that determining the number of intermediate frames per unit time for displaying the animation applied to the change region as the variable value.

Images