KR20170000670A - System for cloud streaming service, method of image cloud streaming service using property of scene region and method using the same - Google Patents

Abstract

Disclosed are a system for a cloud streaming service, a method of an image cloud streaming service using a scene region characteristic, and an apparatus therefor. A cloud streaming server according to the present invention may receive, from a web server, scene region characteristic information corresponding to an application execution screen together with the application execution screen, capture an image corresponding to a changed portion after rendering the application execution screen, encode the image to a still image by using at least one still image encoding technique corresponding to the image on the basis of the scene region characteristic information, and then transmit the encoded image to a user terminal. In addition, resources of a cloud streaming server needed for image processing can be saved, and therefore, the service system can be operated more efficiently.

Description

Technical Field [0001] The present invention relates to a cloud streaming service system, a cloud streaming service system, an image cloud streaming service method using scene area characteristics,

The present invention relates to an image cloud streaming service technology using scene area characteristics, and in particular, by providing information on scene area characteristics of an application execution screen, a cloud streaming server can select an appropriate still image encoding technique without performing image processing A cloud streaming service system, an image cloud service method using scene area characteristics, and an apparatus therefor.

The rapid development of the Internet has resulted in a rapid increase in the communication speed of an individual. The improvement in the communication speed can be achieved by downloading or uploading a large amount of data by accessing a computer located at a remote place, or by using a remote computer control program, As well as providing an environment in which a remote computer can be used.

In addition, as a variety of applications have been developed for mobile communication terminals such as smart phones, many virtualization technologies have been proposed for driving applications requiring high performance in relatively low performance user terminals.

Among them, the application is driven on the server, the driving screen is compressed through video encoding and transmitted to the client, and the client reproduces the transmitted video to generate a screen virtualization Cloud streaming service is becoming popular.

The cloud streaming service basically adopts the cloud streaming method based on the video codec. However, even when a static screen such as a menu display is serviced, the entire screen is unnecessarily captured and operated using a video codec, which makes the overall system ineffective.

Therefore, it is possible to capture only the changed image of the static part on the execution screen of the application executed according to the user's request and provide the changed image to the terminal of the user. However, it is possible to quickly distinguish the characteristics of the image without performing separate image processing, Image-based cloud streaming service technology.

Korean Patent Laid-Open Publication No. 2014-0055132, published May 09, 2014 (name: method and apparatus for processing a web page in a terminal device using a cloud server)

It is an object of the present invention to save the resources of a cloud streaming server that were needed to perform image processing by selecting still image encoding techniques based on scene area characteristics.

It is also an object of the present invention to provide a service to a Klaus streaming service user more quickly by shortening the processing time required for image processing.

It is another object of the present invention to provide a high-performance application execution screen even in a low-end terminal by processing only the changed image on the application execution screen and providing it to the user terminal.

According to an aspect of the present invention, there is provided a cloud streaming server comprising: a receiving unit for receiving scene area characteristic information corresponding to an application execution screen together with an application execution screen from a web server; A capture unit for rendering the application execution screen and capturing an image corresponding to the changed portion; An encoding unit for selecting at least one still image encoding scheme corresponding to the image based on the scene area characteristic information to still image encode the image; And a sending unit for transmitting the still image encoded image to the user terminal.

At this time, the encoding unit acquires the coordinates of the characteristic area classified according to the image characteristic in the scene area characteristic information, and compares whether there is an area corresponding to the characteristic area among the areas corresponding to the image, You can choose still image encoding techniques.

At this time, the encoding unit may still image-encode the partial area with a still image encoding technique selected corresponding to the image characteristic of the characteristic area, when a partial area corresponding to the image corresponds to the characteristic area.

At this time, the image characteristic may correspond to at least one of a natural image and a composite image.

In this case, the encoding unit may still image encode the partial area using a Joint Photographic Experts Group (JPEG) encoding method when the partial area corresponds to the characteristic area, which is the natural image, When the image characteristic corresponds to the characteristic region, which is the composite image, the partial region can be still image encoded using a PNG (Portable Network Graphics) encoding technique.

At this time, if the image does not correspond to the characteristic region, the encoding unit may still image-encode the image with any still image encoding technique corresponding to a predetermined default technique.

At this time, the capture unit can capture the image by comparing a plurality of frames corresponding to the application execution screen.

At this time, the capture unit compares the current frame and the previous frame among the plurality of frames, and can capture the image when it is changed.

According to another aspect of the present invention, there is provided an image cloud streaming service method using a scene region characteristic, the method comprising: receiving scene region characteristic information corresponding to the application execution screen together with an application execution image from a web server; Rendering the application execution screen and capturing an image corresponding to the changed portion; Selecting at least one still image encoding technique corresponding to the image based on the scene area characteristic information to still image encode the image; And transmitting the still image encoded image to a user's terminal.

At this time, the encoding step may include obtaining coordinates of a characteristic area that is classified according to an image characteristic in the scene area characteristic information; And comparing whether there is an area corresponding to the characteristic area among the areas corresponding to the image, and may select the at least one still image encoding technique according to the comparison result.

At this time, the encoding step can still image the partial area with a still image encoding technique selected corresponding to the image characteristic of the characteristic area, when a partial area corresponding to the image corresponds to the characteristic area.

At this time, the image characteristic may correspond to at least one of a natural image and a composite image.

In this case, the encoding may include still image encoding the partial area using a Joint Photographic Experts Group (JPEG) encoding method when the partial area corresponds to the characteristic area in which the image characteristic is the natural image, And if the image characteristic corresponds to the characteristic area which is the composite image, the still image encoding may be performed on the partial area using a PNG (Portable Network Graphics) encoding technique.

At this time, the encoding step can still image encode the image with any still image encoding technique corresponding to a predetermined default technique, in case the image does not correspond to the characteristic region.

At this time, the capturing step may capture the image by comparing a plurality of frames corresponding to the application execution screen.

At this time, the capturing step may compare the current frame and the previous frame among the plurality of frames to capture the image when the change is made.

According to the present invention, it is possible to save the resources of the cloud streaming server that were necessary to perform image processing by selecting the still image encoding technique based on the scene area property.

Further, the present invention can provide a service to a Klaus streaming service user more quickly by shortening the processing time required for image processing.

Further, according to the present invention, only the changed image is processed in the application execution screen and provided to the user terminal, so that a high-performance application execution screen can be provided even in low-end terminals.

1 is a block diagram illustrating a cloud streaming service system according to an embodiment of the present invention.
2 is a diagram illustrating an example of the cloud streaming server shown in FIG.
3 is a block diagram illustrating an operation of an image-based cloud streaming service system according to an exemplary embodiment of the present invention.
4 is a diagram showing application execution screens and coordinates according to an embodiment of the present invention.
5 is a view illustrating scene area characteristic information according to an embodiment of the present invention.
6 is a diagram illustrating a process of capturing an application execution screen according to an embodiment of the present invention.
7 is a flowchart illustrating an image cloud streaming service method using a scene area characteristic according to an exemplary embodiment of the present invention.
8 is a flowchart illustrating an image cloud streaming service method using a scene area characteristic according to an exemplary embodiment of the present invention.
9 is a flowchart illustrating a method of performing still image encoding based on scene area characteristics 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. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings and the inventor is not limited to the concept of terminology for describing his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible. Also, the terms first, second, etc. are used for describing various components and are used only for the purpose of distinguishing one component from another component, and are not used to define the components.

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

Referring to FIG. 1, a cloud streaming service system according to an embodiment of the present invention includes a cloud streaming server 110, a web server 120, terminals 130-1 to 130-N, and a network.

The cloud streaming server 110 receives the application execution screen from the web server 120 and the scene area characteristic information corresponding to the application execution screen.

At this time, the scene area characteristic information may include the coordinates of the characteristic area divided according to the image characteristic and the image characteristic.

At this time, the image characteristic may correspond to at least one of a natural image and a composite image.

In addition, the cloud streaming server 110 renders an application execution screen to capture an image corresponding to the changed portion.

At this time, an image can be captured by comparing a plurality of frames corresponding to an application execution screen.

At this time, the current frame and the previous frame among the plurality of frames may be compared to capture an image when the frame is changed.

In addition, the cloud streaming server 110 still images the image by selecting at least one still image encoding technique corresponding to the image based on the scene area property information.

At this time, the coordinates of the characteristic region classified according to the image characteristic are obtained from the scene characteristic information, and whether or not there is a region corresponding to the characteristic region among the regions corresponding to the image exists is selected to select at least one still image encoding technique .

At this time, if some of the areas corresponding to the images correspond to the characteristic areas, the still areas may be still image-encoded with the still image encoding technique selected corresponding to the image characteristics of the characteristic areas.

In this case, when a certain region corresponds to a characteristic region in which the image characteristic is a natural image, some regions are still-image encoded using a JPEG (Joint Photography Experts Group) encoding technique, It is possible to still image encode some areas using a Portable Network Graphics (PNG) encoding technique.

At this time, when the image does not correspond to the characteristic region, the still image can be still-image-encoded with any still image encoding technique corresponding to a predetermined default technique.

Also, the cloud streaming server 110 transmits the still image encoded image to the user terminals 130-1 to 130-N.

The web server 120 is a means for executing an application according to a user's request through the terminals 130-1 to 130-N. The web server 120 is a web server or a JSP , a web application server that can execute programs such as servlets to provide dynamic results.

The terminals 130-1 to 130-N receive an application execution screen corresponding to the cloud streaming service from the cloud streaming server 120 and provide them to the user.

Each of the terminals 130-1 to 130-N is connected to a communication network and is capable of executing applications on the basis of a cloud computing system. The terminal 130-1 to 130-N are not limited to a mobile communication terminal but may be any information communication device, a multimedia terminal, A fixed terminal and an IP (Internet Protocol) terminal. Each of the terminals 130-1 to 130-N may be a mobile phone, a portable multimedia player (PMP), a mobile Internet device (MID), a smart phone, a desktop, a tablet PC, A mobile terminal having various mobile communication specifications such as a notebook computer, a notebook computer, a netbook, a personal digital assistant (PDA), a smart TV, and an information communication device.

The terminals 130-1 to 130-N receive various kinds of information such as numbers and character information, set various functions, and transmit signals inputted in association with the function control of the terminals 130-1 to 130-N And can be transmitted to the control unit through the input unit. The input unit of the terminals 130-1 to 130-N may include at least one of a keypad and a touch pad for generating an input signal according to a user's touch or operation. At this time, the input units of the terminals 130-1 to 130-N are configured in the form of one touch panel (or touch screen) together with the display units of the terminals 130-1 to 130-N, Display function can be performed at the same time. The input units of the terminals 130-1 to 130-N may be input means such as a keyboard, a keypad, a mouse, a joystick, etc., as well as any type of input means that can be developed in the future. In particular, the input units of the terminals 130-1 to 130-N according to the present invention can transmit input signals for uploading or downloading contents based on cloud computing to the control units of the terminals 130-1 to 130-N.

In addition, the display units of the terminals 130-1 to 130-N can display information on a series of operation states, operation results, and the like that occur during the performance of the functions of the terminals 130-1 to 130-N. In addition, the display units of the terminals 130-1 to 130-N can display menus of the terminals 130-1 to 130-N and user data input by the user. The display units of the terminals 130-1 to 130-N may be a liquid crystal display (LCD), a thin film transistor LCD (TFT-LCD), a light emitting diode (LED) An organic light emitting diode (OLED), an organic light emitting diode (AMOLED), an active matrix OLED, a retina display, a flexible display, and a three-dimensional display have. In this case, when the display units of the terminals 130-1 to 130-N are configured as touch screens, the display units of the terminals 130-1 to 130-N function as the input units of the terminals 130-1 to 130- Some or all of them. In particular, the display unit of the terminals 130-1 to 130-N according to the present invention can display information related to execution of content provided on a cloud computing basis on a screen.

The storage units of the terminals 130-1 to 130-N are devices for storing data and include a main storage device and an auxiliary storage device and are used for applications required for functional operations of the terminals 130-1 to 130- You can save the program. The storage units of the terminals 130-1 to 130-N may largely include a program area and a data area. Here, when the terminals 130-1 to 130-N activate the respective functions in response to a request from the user, the terminals 130-1 to 130-N provide respective functions by executing the corresponding application programs under the control of the controller. In particular, the storage units of the terminals 130-1 to 130-N according to the present invention may store operating systems for booting the terminals 130-1 to 130-N, programs for uploading or downloading contents based on cloud computing have. Also, the storage units of the terminals 130-1 to 130-N may store information of the content DB storing the plurality of contents and information of the terminals 130-1 to 130-N. At this time, the content DB includes execution data for executing the content and attribute information about the content, and content usage information according to the execution of the content can be stored. The information of the terminals 130-1 to 130-N may include terminal specification information.

In addition, the communication units of the terminals 130-1 to 130-N can perform a function of transmitting and receiving data through the cloud streaming server 120 and the network 140. [ Here, the communication unit of the terminals 130-1 to 130-N may include RF transmitting means for up-converting and amplifying the frequency of the transmitted signal, RF receiving means for low-noise amplifying the received signal and down-converting the frequency . The communication units of the terminals 130-1 to 130-N may include at least one of a wireless communication module and a wired communication module. In the case where the terminals 130-1 to 130-N use wireless communication, the wireless communication module is a wireless communication module, a wireless LAN communication module, and a wireless fan communication module The data can be transmitted / received to / from the cloud streaming server 120 by using any one of them. The wired communication module is for transmitting / receiving data by wire. The wired communication module may connect to the network 140 via a wired network and transmit / receive data to / from the cloud streaming server 120. That is, the terminals 130-1 to 130-N access the network 140 using a wireless communication module or a wired communication module and transmit and receive data to and from the cloud streaming server 120 through the network 140. [ In particular, the network 140 according to the present invention can communicate with the cloud streaming server 120 or other terminals 130-1 to 130-N to transmit / receive data necessary for uploading or downloading content based on cloud computing.

The control unit of the terminal devices 130-1 to 130-N may be an operating system (OS) and a process device for driving each configuration. For example, the control unit may include a cloud streaming server 120, When accessing the cloud streaming server 120 through a separate service application, it is possible to control the entire process of executing the service application according to the request of the user, and at the same time, It is possible to control the streaming server 120 to transmit the service use request and control the information of the terminals 130-1 to 130-N necessary for user authentication to be transmitted together.

In addition, the control units of the terminals 130-1 to 130-N can execute specific contents stored in the storage units of the terminals 130-1 to 130-N at the request of the user. At this time, the control unit may store the content usage history according to the execution of the content as the content usage information.

In addition, the control unit of the terminals 130-1 to 130-N executes the content data including the execution data for executing the content, the content information including the attribute information about the content, and the content use information, And uploaded to the server 120 for uploading. Thereafter, the controller transmits the uploaded content to the cloud streaming server 120, deletes the uploaded content from the storage of the terminals 130-1 to 130-N according to the user's request, connects to the cloud streaming server 120 The content may be executed through the cloud streaming server 120 and used.

The control units of the terminals 130-1 to 130-N may access the cloud streaming server 120 and download the contents from the other terminals 130-1 to 130-N and control the contents to be stored in the storage unit , It is possible to control the content to be executed after receiving only the data necessary for execution at the time of executing the content through the cloud streaming server 120. [

The network 140 provides a path for transferring data between the web server 120 and the cloud streaming server 110 and between the cloud streaming server 110 and the terminals 130-1 to 130-N. It is a concept that encompasses both the network used and the network that can be developed in the future. For example, the network 140 may be a wired or wireless local area network that provides communication of various information devices within a limited area, a mobile communication network that provides communication between mobile objects and mobile objects outside the mobile object, Or a wired / wireless communication network, or a combination of two or more. Meanwhile, the transmission standard of the network 140 is not limited to the existing transmission standard, and may include all transmission standard to be developed in the future. 1, a network used between the web server 120 and the cloud streaming server 110 and between the cloud streaming server 110 and the terminals 130-1 to 130- N may be the same or different from the network used between them.

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

2, the cloud streaming server 110 shown in FIG. 1 includes a receiving unit 210, a capturing unit 220, an encoding unit 230, a sending unit 240, and a storage unit 250.

The receiving unit 210 receives the application execution screen from the web server and the scene area characteristic information corresponding to the application execution screen.

At this time, if the user inputs a service request using the terminal, the web server receiving the service request can execute the application corresponding to the service request. For example, when a user enters a key in a terminal, the user can be transmitted to the web server through a cloud streaming server. That is, after the user's terminal and the cloud streaming server communicate with each other and receive user input from the cloud streaming server, the cloud streaming server communicates with the web server again to transmit the user input, .

At this time, user input can be received through a communication network such as the network shown in Fig.

At this time, the web server generates an application execution screen, and generates scene area characteristic information for the application execution screen together with the generated application execution screen, and can transmit the generated scene area characteristic information to the cloud streaming server.

At this time, the scene area characteristic information may include coordinates of the characteristic area classified according to the image characteristic included in the application execution screen and the image characteristic.

At this time, the process for later image processing can be omitted by receiving the scene area characteristic information together. In the conventional image-based cloud streaming service method, image processing is performed on an image captured on an application execution screen, thereby determining an encoder for still image encoding an image. However, in order to perform such image processing, the server resource and time of the cloud streaming server may be consumed, thereby increasing the load of the entire system.

Therefore, in order to solve such a problem, in the present invention, the scene area characteristic information, which is information corresponding to the result of the image processing, is provided together with the application execution screen, so that the system can be operated more efficiently.

The capture unit 220 renders an application execution screen to capture an image corresponding to the changed portion.

The cloud streaming technique based on the video codec can capture and encode all the frames corresponding to the screen on which the application operates. However, when the frame-to-frame change on the screen on which the application operates is not large, the still-image encoding is performed by capturing only the change area of the changed frame as compared with the previous frame like the image-based cloud streaming technique, It is possible to display the parts except for the change area in the same manner and display only the change area.

Therefore, the cloud streaming service system according to the present invention can use an image-based cloud streaming technique rather than a video codec-based cloud streaming technique.

At this time, an image can be captured by comparing a plurality of frames corresponding to an application execution screen.

In this case, it is possible to detect intervals in which a change between frames is small among a plurality of frames, and to capture an image in a section where a change between frames is small. For example, it may be inefficient to provide an image-based cloud streaming service because there are a large number of images to be captured with a large number of frames between frames. Accordingly, in such a period, a service can be performed through a cloud streaming technique based on a video codec, and an image of a changed region can be captured in order to perform an image-based cloud streaming service only in a period in which there is little change between frames.

At this time, the current frame and the previous frame among the plurality of frames may be compared to capture an image when the frame is changed. For example, when comparing the menu screen of the previous frame with the menu screen of the current frame, it is assumed that the display activated in the menu of the current frame is changed compared with the previous frame, It can be captured as an image.

The encoding unit 230 still image encodes the image by selecting at least one still image encoding technique corresponding to the image based on the scene area characteristic information.

Generally, in the image-based cloud streaming service system, the still image encoding technique can be determined in consideration of the load generated in the cloud streaming server, the service speed, the image quality of the image, or the performance of the terminal receiving and rendering the encoded image. For example, to improve the speed of the cloud streaming service, you can compress the image with a palette PNG encoding method that has a high compression ratio and low load. In addition, if it is desired to provide a good image quality without regard to the load, the image can be compressed using the PNG 32-bit encoding method or the JPEG encoding method.

Accordingly, in the present invention, at least one still image encoding technique can be selected using information on the image acquired through the scene area characteristic information.

At this time, the coordinates of the characteristic region classified according to the image characteristic are obtained from the scene characteristic information, and whether or not there is a region corresponding to the characteristic region among the regions corresponding to the image exists is selected to select at least one still image encoding technique .

At this time, the image characteristic may correspond to at least one of a natural image and a composite image. For example, a natural image can mean an image, such as a picture or a picture. That is, it may be an image corresponding to an image format such as JPEG, PNG, and GIF. Also, a composite image may correspond to an image created by combining multiple images. That is, it may correspond to a screen representing a text on an application execution screen, a background screen, and the like.

Therefore, through the scene area characteristic information, it is possible to know at which position of the application execution screen the natural image is included and at which other position the composite image is included. That is, based on such information, it is possible to select a still image encoding method for still image encoding of the image more easily by checking which region of the characteristic region corresponding to the natural image or the characteristic region corresponding to the composite image has been captured.

For example, in the application execution screen, the image characteristic of the rectangular characteristic region having the coordinates of the upper left vertex (x1 = 100, y1 = 100) and the coordinates of the lower right vertex (x2 = 200, y2 = 200) (X1 = 50, y1 = 50) and the coordinates of the lower right vertex (x2 = 500, y2 = 250) are captured as an image for the service. At this time, it can be confirmed that the region corresponding to the captured image includes the characteristic region corresponding to the natural image. Therefore, the region corresponding to the characteristic region among the regions corresponding to the captured image can be set to be still image encoded by the still image encoding technique corresponding to the natural image. In addition, it is also possible to set the remaining region, which is not the characteristic region, of the region corresponding to the captured image to be encoded using any still image encoding technique corresponding to a predetermined default technique.

At this time, if some of the regions corresponding to the images correspond to the characteristic regions, some regions may be still image encoded with the still image encoding technique selected corresponding to the image characteristic of the characteristic regions. For example, if it is assumed that the image characteristic corresponding to the characteristic region corresponds to the natural image, some regions may be still image encoded with the still image encoding technique corresponding to the natural image. Further, if it is assumed that the image characteristic corresponding to the characteristic region corresponds to the composite image, some regions may be still image encoded by a still image encoding technique corresponding to the composite image.

In this case, when a certain region corresponds to a characteristic region in which the image characteristic is a natural image, some regions are still-image encoded using a JPEG (Joint Photography Experts Group) encoding technique, It is possible to still image encode some areas using a Portable Network Graphics (PNG) encoding technique.

In this case, the JPEG encoding scheme can greatly reduce the amount of data to be transmitted during encoding because of its high compression efficiency, but it can generate a large system load when performing encoding and decoding as the compression efficiency is large. Therefore, in the case of an image having a large data size such as a natural image, the still image encoding is performed using the JPEG encoding technique, thereby greatly reducing the amount of data to be transmitted during network transmission.

In addition, the PNG encoding scheme can improve the image quality when encoding, but the transmission speed may be lowered when the bandwidth of the transmission network is low due to a large data size. That is, in the case of an image whose image quality is not clear like a composite image but whose data size is relatively smaller than that of a natural image, the image quality of the image provided to the user can be guaranteed by still image encoding using the PNG encoding technique.

In addition to the JPEG encoding method and the PNG encoding method, a palette PNG encoding method which can deteriorate the image quality due to the 8-bit color representation can also be used in the cloud streaming Depending on the performance of the server, it can be adopted.

At this time, when the image does not correspond to the characteristic region, the still image can be still-image-encoded with any still image encoding technique corresponding to a predetermined default technique. That is, when the scene area characteristic information does not include information of all areas corresponding to the application execution screen, a default technique that can be used arbitrarily can be set and used in advance. For example, assuming that the PNG encoding scheme is set as the default scheme, the image can be still-image encoded using the PNG encoding scheme if the image does not correspond to the feature region.

The sending unit 240 transmits the still image encoded image to the user terminal.

At this time, when the terminal receives the still image encoded image, it can render the image again, display the rendered image on the screen of the terminal, and display it to the user.

The storage unit 250 stores various information generated in the cloud streaming service process according to the embodiment of the present invention as described above.

According to an embodiment, the storage unit 250 may be configured independently of the cloud streaming server 110 to support a function for the cloud streaming service. At this time, the storage unit 250 may operate as a separate mass storage and may include a control function for performing operations.

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 can store information in the memory on which the memory is mounted. In one implementation, the memory is a computer-readable medium. In one implementation, the memory may be a volatile memory unit, and in other embodiments, the memory may be a non-volatile memory unit. In one implementation, the storage device is a computer-readable medium. In various different implementations, the storage device may comprise, for example, a hard disk device, an optical disk device, or any other mass storage device.

By providing an image-based cloud streaming service through the cloud streaming server 110, resources of the cloud streaming server, which is necessary to perform image processing, can be saved.

Further, by shortening the processing time required for image processing, it is possible to provide the service to the Klaus streaming service user more quickly.

In addition, by processing only the changed image on the application execution screen and providing it to the user terminal, it is possible to provide a high-performance application execution screen even in low-end terminals.

3 is a block diagram illustrating an operation of an image-based cloud streaming service system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the web server 320 may execute an application corresponding to a user input inputted from the user terminal 330. [ At this time, the web server 320 generates an application execution screen of the executed application, and transmits the application execution screen to the receiving section 311 of the cloud streaming server 310 together with the scene area characteristic information corresponding to the application execution screen have.

At this time, the scene area characteristic information may include the coordinates of the characteristic area divided according to the image characteristic and the image characteristic.

At this time, the image characteristic may correspond to either the natural image or the composite image.

Thereafter, the capture unit 312 of the cloud streaming server 310 may capture an image to be transmitted to the user's terminal 330 on the application execution screen received from the web server 320. [

At this time, it is possible to extract a relatively small portion of a plurality of frames constituting the application execution screen, and to compare the frames of the extracted portion, thereby capturing an image in the changed frame. For example, when the current frame is compared with the previous frame, if there is a change in the current frame, the portion with the change in the current frame can be captured as an image.

Thereafter, the encoding unit 313 of the cloud streaming server 310 may select at least one still image encoding technique for still image encoding the image based on the scene area characteristic information.

At this time, the coordinates of the characteristic region classified according to the image characteristic in the scene region characteristic information are obtained, and it is possible to compare whether the region corresponding to the image is included in the characteristic region. In addition, when a partial region or an entire region corresponding to an image is included in the characteristic region, the still image encoding technique can be selected according to the image characteristic of the characteristic region.

In addition, when the image is not included in the characteristic area at all, the still image encoding technique can be selected by the default technique set by the system administrator.

Thereafter, the still image can be still image encoded using the selected still image encoding technique.

For example, assuming that the image characteristic of the characteristic region is a natural image and that a part of the image corresponds to this, some regions of the image are still image encoded by the JEPG encoding technique, and the remaining regions except for a portion of the image are PNG encoding technique As shown in FIG.

Also, assuming that the PNG encoding scheme is set as the default scheme and the image is not included in the feature area at all, the image may still be image encoded with the PNG encoding scheme corresponding to the default scheme.

Thereafter, the sending unit 314 of the cloud streaming server 310 may transmit the still image encoded image to the user's terminal 330.

4 is a diagram showing application execution screens and coordinates according to an embodiment of the present invention.

Referring to FIG. 4, an application execution screen 410 according to an exemplary embodiment of the present invention may include two posters P1 411 and P2 412 corresponding to a natural image.

At this time, in the scene area characteristic information, characteristic areas corresponding to the two posters 411 and 412 can be represented by coordinates. For example, assuming that the horizontal axis of the application execution screen 410 is the X axis and the vertical axis is the Y axis, the coordinates of the upper left vertex and the lower right vertex of the two posters 411 and 412 can be represented have.

The description of the scene area characteristic information related thereto will be described with reference to FIG.

5 is a view illustrating scene area characteristic information according to an embodiment of the present invention.

Referring to FIG. 5, it is possible to know the scene area characteristic information 511 for the two posters P1 411 and P2 412 included in the application execution screen 410 shown in FIG.

At this time, it can be confirmed that the scene area characteristic information 511 includes the coordinate information 511 and 512 for the two posters P1 411 and P2 412, respectively.

At this time, the coordinate information 511 for the poster P1 411 is the coordinate of the upper left vertex of the poster P1 411 and the coordinates of the lower right vertex of the poster P1 411, '<x1 = 100 /> <y1 = 100 / &lt; x2 = 400 / &lt; y2 = 300 / &gt; '.

In addition, the coordinate information 511 may include information such as '<imgProperty = "Natural" />' so that the image characteristic of the poster P1 411 is a natural image.

At this time, the scene area characteristic information 511 may include all the coordinate information for the characteristic area corresponding to the natural image on the application execution screen 410 of FIG.

Therefore, the scene area characteristic information 511 may also include the coordinate information 512 for the poster P2 412 together with the coordinate information 511 for the poster P1 411.

At this time, the coordinate information 512 for the poster P2 412 is the coordinates of the upper left vertex of the poster P2 412 and the coordinates of the lower right vertex, which are '<x1 = 500 /> <y1 = 100 />' &lt; x2 = 800 / < y2 = 300 / > '.

In addition, the coordinate information 512 may include information such as '<imgProperty = "Natural" />' so that the image characteristic of the poster P2 412 is a natural image.

By providing the cloud streaming server with the coordinate information (511, 512) of the area corresponding to the scene area characteristic information 510 and the scene area characteristic information 510 as described above, the cloud streaming server The process of performing image processing to select a suitable still image encoding technique may be omitted. That is, it is possible to save resources in the cloud streaming server by omitting the image processing process, and it is possible to provide the service more quickly as the process is omitted for the users who are provided with the service.

6 is a diagram illustrating a process of capturing an application execution screen according to an embodiment of the present invention.

Referring to FIG. 6, in the process of capturing an application execution screen according to an embodiment of the present invention, frames of a portion with a small screen change among a plurality of frames corresponding to an application execution screen can be obtained.

At this time, it may be more efficient to provide the application execution screen to the user through the cloud streaming service based on the video codec for the part where the screen changes much.

Thereafter, it is possible to compare the previous frame 610 and the current frame 620 among the frames of the small change. For example, when comparing the previous frame 610 and the current frame 620 shown in FIG. 6, there is no change in the C region and the D region of the two frames, but the A region and the B region of the previous frame 610 are In the frame 620, it can be confirmed that A 'and B' are changed.

Accordingly, the cloud streaming server may check for such changes, determine the changed A 'and B' regions as changed regions, and capture the captured images as a captured image 630. That is, the image corresponding to the changed area in the capture unit of the cloud streaming server can be captured.

Also, when comparing the previous frame 610 and the current frame 620, if a plurality of areas are identified as changed areas, one area including all the changed areas can be captured as the captured image 630. In addition, it is also possible to recognize a plurality of changed areas as a captured image 630, respectively, and capture the captured images as a plurality of captured images 630 to perform an image-based cloud streaming service.

7 is a flowchart illustrating an image cloud streaming service method using a scene area characteristic according to an exemplary embodiment of the present invention.

Referring to FIG. 7, an image cloud streaming service method using a scene area characteristic according to an embodiment of the present invention receives scene area characteristic information corresponding to an application execution screen together with an application execution screen from a web server (S710).

At this time, if the user inputs a service request using the terminal, the web server receiving the service request can execute the application corresponding to the service request. For example, when a user enters a key in a terminal, the user can be transmitted to the web server through a cloud streaming server. That is, after the user's terminal and the cloud streaming server communicate with each other and receive user input from the cloud streaming server, the cloud streaming server communicates with the web server again to transmit the user input, .

At this time, user input can be received through a communication network such as the network shown in Fig.

At this time, the web server generates an application execution screen, and generates scene area characteristic information for the application execution screen together with the generated application execution screen, and can transmit the generated scene area characteristic information to the cloud streaming server.

At this time, the scene area characteristic information may include coordinates of the characteristic area classified according to the image characteristic included in the application execution screen and the image characteristic.

At this time, the process for later image processing can be omitted by receiving the scene area characteristic information together. In the conventional image-based cloud streaming service method, image processing is performed on an image captured on an application execution screen, thereby determining an encoder for still image encoding an image. However, in order to perform such image processing, the server resource and time of the cloud streaming server may be consumed, thereby increasing the load of the entire system.

Therefore, in order to solve such a problem, in the present invention, the scene area characteristic information, which is information corresponding to the result of the image processing, is provided together with the application execution screen, so that the system can be operated more efficiently.

In addition, the image cloud streaming service method using the scene area characteristic according to an embodiment of the present invention renders an application execution screen and captures an image corresponding to the changed part (S720).

The cloud streaming technique based on the video codec can capture and encode all the frames corresponding to the screen on which the application operates. However, when the frame-to-frame change on the screen on which the application operates is not large, the still-image encoding is performed by capturing only the change area of the changed frame as compared with the previous frame like the image-based cloud streaming technique, It is possible to display the parts except for the change area in the same manner and display only the change area.

Therefore, the cloud streaming service system according to the present invention can use an image-based cloud streaming technique rather than a video codec-based cloud streaming technique.

At this time, an image can be captured by comparing a plurality of frames corresponding to an application execution screen.

In this case, it is possible to detect intervals in which a change between frames is small among a plurality of frames, and to capture an image in a section where a change between frames is small. For example, it may be inefficient to provide an image-based cloud streaming service because there are a large number of images to be captured with a large number of frames between frames. Accordingly, in such a period, a service can be performed through a cloud streaming technique based on a video codec, and an image of a changed region can be captured in order to perform an image-based cloud streaming service only in a period in which there is little change between frames.

At this time, the current frame and the previous frame among the plurality of frames may be compared to capture an image when the frame is changed. For example, when comparing the menu screen of the previous frame with the menu screen of the current frame, it is assumed that the display activated in the menu of the current frame is changed compared with the previous frame, It can be captured as an image.

Also, in the image cloud streaming service method using the scene area characteristic according to the embodiment of the present invention, still image encoding is performed by selecting at least one still image encoding technique corresponding to the image based on the scene area characteristic information (S730 ).

Generally, in the image-based cloud streaming service system, the still image encoding technique can be determined in consideration of the load generated in the cloud streaming server, the service speed, the image quality of the image, or the performance of the terminal receiving and rendering the encoded image. For example, to improve the speed of the cloud streaming service, you can compress the image with a palette PNG encoding method that has a high compression ratio and low load. In addition, if it is desired to provide a good image quality without regard to the load, the image can be compressed using the PNG 32-bit encoding method or the JPEG encoding method.

Accordingly, in the present invention, at least one still image encoding technique can be selected using information on the image acquired through the scene area characteristic information.

At this time, the coordinates of the characteristic region classified according to the image characteristic are obtained from the scene characteristic information, and whether or not there is a region corresponding to the characteristic region among the regions corresponding to the image exists is selected to select at least one still image encoding technique .

At this time, the image characteristic may correspond to at least one of a natural image and a composite image. For example, a natural image can mean an image, such as a picture or a picture. That is, it may be an image corresponding to an image format such as JPEG, PNG, and GIF. Also, a composite image may correspond to an image created by combining multiple images. That is, it may correspond to a screen representing a text on an application execution screen, a background screen, and the like.

Therefore, through the scene area characteristic information, it is possible to know at which position of the application execution screen the natural image is included and at which other position the composite image is included. That is, based on such information, it is possible to select a still image encoding method for still image encoding of the image more easily by checking which region of the characteristic region corresponding to the natural image or the characteristic region corresponding to the composite image has been captured.

For example, in the application execution screen, the image characteristic of the rectangular characteristic region having the coordinates of the upper left vertex (x1 = 100, y1 = 100) and the coordinates of the lower right vertex (x2 = 200, y2 = 200) (X1 = 50, y1 = 50) and the coordinates of the lower right vertex (x2 = 500, y2 = 250) are captured as an image for the service. At this time, it can be confirmed that the region corresponding to the captured image includes the characteristic region corresponding to the natural image. Therefore, the region corresponding to the characteristic region among the regions corresponding to the captured image can be set to be still image encoded by the still image encoding technique corresponding to the natural image. In addition, it is also possible to set the remaining region, which is not the characteristic region, of the region corresponding to the captured image to be encoded using any still image encoding technique corresponding to a predetermined default technique.

At this time, if some of the regions corresponding to the images correspond to the characteristic regions, some regions may be still image encoded with the still image encoding technique selected corresponding to the image characteristic of the characteristic regions. For example, if it is assumed that the image characteristic corresponding to the characteristic region corresponds to the natural image, some regions may be still image encoded with the still image encoding technique corresponding to the natural image. Further, if it is assumed that the image characteristic corresponding to the characteristic region corresponds to the composite image, some regions may be still image encoded by a still image encoding technique corresponding to the composite image.

In this case, when a certain region corresponds to a characteristic region in which the image characteristic is a natural image, some regions are still-image encoded using a JPEG (Joint Photography Experts Group) encoding technique, It is possible to still image encode some areas using a Portable Network Graphics (PNG) encoding technique.

In this case, the JPEG encoding scheme can greatly reduce the amount of data to be transmitted during encoding because of its high compression efficiency, but it can generate a large system load when performing encoding and decoding as the compression efficiency is large. Therefore, in the case of an image having a large data size such as a natural image, the still image encoding is performed using the JPEG encoding technique, thereby greatly reducing the amount of data to be transmitted during network transmission.

In addition, the PNG encoding scheme can improve the image quality when encoding, but the transmission speed may be lowered when the bandwidth of the transmission network is low due to a large data size. That is, in the case of an image whose image quality is not clear like a composite image but whose data size is relatively smaller than that of a natural image, the image quality of the image provided to the user can be guaranteed by still image encoding using the PNG encoding technique.

In addition to the JPEG encoding method and the PNG encoding method, a palette PNG encoding method which can deteriorate the image quality due to the 8-bit color representation can also be used in the cloud streaming Depending on the performance of the server, it can be adopted.

At this time, when the image does not correspond to the characteristic region, the still image can be still-image-encoded with any still image encoding technique corresponding to a predetermined default technique. That is, when the scene area characteristic information does not include information of all areas corresponding to the application execution screen, a default technique that can be used arbitrarily can be set and used in advance. For example, assuming that the PNG encoding scheme is set as the default scheme, the image can be still-image encoded using the PNG encoding scheme if the image does not correspond to the feature region.

In addition, the image cloud streaming service method using the scene area characteristic according to an embodiment of the present invention transmits the still image encoded image to the user terminal (S740).

At this time, when the terminal receives the still image encoded image, it can render the image again, display the rendered image on the screen of the terminal, and display it to the user.

Also, although not shown in FIG. 7, the image cloud streaming service method using the scene area characteristic according to an embodiment of the present invention may include various information generated in the cloud streaming service process according to the embodiment of the present invention, .

According to an embodiment, the storage module for storing various information may be configured independently of the cloud streaming server to support the function for the cloud streaming service. At this time, the storage module may operate as a separate mass storage and may include control functions for performing operations.

This image-based cloud streaming service method provides image-based cloud streaming service, which can save the resources of cloud streaming server that was needed to perform image processing.

Further, by shortening the processing time required for image processing, it is possible to provide the service to the Klaus streaming service user more quickly.

In addition, by processing only the changed image on the application execution screen and providing it to the user terminal, it is possible to provide a high-performance application execution screen even in low-end terminals.

8 is a flowchart illustrating an image cloud streaming service method using a scene area characteristic according to an exemplary embodiment of the present invention.

Referring to FIG. 8, an image cloud streaming service method using a scene area characteristic according to an embodiment of the present invention receives scene area characteristic information corresponding to an application execution screen together with an application execution screen from a web server (S810) .

At this time, if the user inputs a service request using the terminal, the web server receiving the service request can execute the application corresponding to the service request.

At this time, user input can be received through a communication network such as the network shown in Fig.

At this time, the web server generates an application execution screen, and generates scene area characteristic information for the application execution screen together with the generated application execution screen, and can transmit the generated scene area characteristic information to the cloud streaming server.

At this time, the process for later image processing can be omitted by receiving the scene area characteristic information together. In the conventional image-based cloud streaming service method, image processing is performed on an image captured on an application execution screen, thereby determining an encoder for still image encoding an image. However, in order to perform such image processing, the server resource and time of the cloud streaming server may be consumed, thereby increasing the load of the entire system.

Therefore, in order to solve such a problem, in the present invention, the scene area characteristic information, which is information corresponding to the result of the image processing, is provided together with the application execution screen, so that the system can be operated more efficiently.

At this time, the scene area characteristic information may include coordinates of the characteristic area classified according to the image characteristic included in the application execution screen and the image characteristic.

At this time, the image characteristic may correspond to at least one of a natural image and a composite image. For example, a natural image can mean an image, such as a picture or a picture. That is, it may be an image corresponding to an image format such as JPEG, PNG, and GIF. Also, a composite image may correspond to an image created by combining multiple images. That is, it may correspond to a screen representing a text on an application execution screen, a background screen, and the like.

Thereafter, the coordinates of the characteristic region classified according to the image characteristic are obtained from the scene characteristic information (S820). For example, the coordinates of the upper left vertex (x1 = 100, y1 = 100) and the coordinates of the lower right vertex (x2 = 200, y2 = 200) The position of the characteristic region can be known.

 Thereafter, in order to capture the image of the changed portion, a plurality of frames corresponding to the application execution screen are compared (S830).

In this case, it is possible to detect intervals in which a change between frames is small among a plurality of frames, and to capture an image in a section where a change between frames is small. For example, it may be inefficient to provide an image-based cloud streaming service because there are a large number of images to be captured with a large number of frames between frames. Accordingly, in such a period, a service can be performed through a cloud streaming technique based on a video codec, and an image of a changed region can be captured in order to perform an image-based cloud streaming service only in a period in which there is little change between frames.

At this time, the current frame and the previous frame among the plurality of frames may be compared to capture an image when the frame is changed. For example, when comparing the menu screen of the previous frame with the menu screen of the current frame, it is assumed that the display activated in the menu of the current frame is changed compared with the previous frame, It can be captured as an image.

Thereafter, an image is captured on the application execution screen (S840).

The cloud streaming technique based on the video codec can capture and encode all the frames corresponding to the screen on which the application operates. However, when the frame-to-frame change on the screen on which the application operates is not large, the still-image encoding is performed by capturing only the change area of the changed frame as compared with the previous frame like the image-based cloud streaming technique, It is possible to display the parts except for the change area in the same manner and display only the change area.

Therefore, the cloud streaming service system according to the present invention can use an image-based cloud streaming technique rather than a video codec-based cloud streaming technique.

Thereafter, it is determined whether the entire area or a part of the captured image is included in the characteristic area (S845).

If the entire area or a partial area of the captured image is included in the characteristic area as a result of the determination in step S845, the area corresponding to the characteristic area among the areas of the image may be still image encoded using the still image encoding technique corresponding to the image characteristic of the characteristic area. (S850).

In this case, when a certain region corresponds to a characteristic region in which the image characteristic is a natural image, some regions are still-image encoded using a JPEG (Joint Photography Experts Group) encoding technique, It is possible to still image encode some areas using a Portable Network Graphics (PNG) encoding technique.

In this case, the JPEG encoding scheme can greatly reduce the amount of data to be transmitted during encoding because of its high compression efficiency, but it can generate a large system load when performing encoding and decoding as the compression efficiency is large. Therefore, in the case of an image having a large data size such as a natural image, the still image encoding is performed using the JPEG encoding technique, thereby greatly reducing the amount of data to be transmitted during network transmission.

In addition, the PNG encoding scheme can improve the image quality when encoding, but the transmission speed may be lowered when the bandwidth of the transmission network is low due to a large data size. That is, in the case of an image whose image quality is not clear like a composite image but whose data size is relatively smaller than that of a natural image, the image quality of the image provided to the user can be guaranteed by still image encoding using the PNG encoding technique.

Thereafter, the remaining area is still image encoded by the default technique (S860).

That is, when the scene area characteristic information does not include information of all areas corresponding to the application execution screen, a default technique that can be used arbitrarily can be set and used in advance. For example, assuming that the PNG encoding scheme is set as the default scheme, the image can be still-image encoded using the PNG encoding scheme if the image does not correspond to the feature region.

If it is determined in step S845 that the entire area or a part of the captured image is not included in the characteristic area, the still image is encoded in the default technique (S870).

Thereafter, the still image encoded image is transmitted to the user terminal (S880).

At this time, when the terminal receives the still image encoded image, it can render the image again, display the rendered image on the screen of the terminal, and display it to the user.

9 is a flowchart illustrating a method of performing still image encoding based on scene area characteristics according to an embodiment of the present invention.

Referring to FIG. 9, in the method of performing still image encoding based on a scene area characteristic according to an exemplary embodiment of the present invention, an image characteristic of a characteristic area is checked in an application execution screen (S910).

For example, the position of the characteristic region and the image characteristic can be checked through the coordinate information included in the scene region characteristic information.

Thereafter, it is determined whether the image characteristic of the characteristic information is a natural image (S915).

As a result of the determination in step S915, the region corresponding to the characteristic region among the natural image plane and the captured image may be still image encoded using the JEPG encoding scheme (S920).

If it is determined in step S915 that the image is not a natural image, it is determined that the image is a composite image, and the region corresponding to the characteristic region in the captured image is still image encoded using the PNG encoding method (S930).

 In this case, the JPEG encoding scheme can greatly reduce the amount of data to be transmitted during encoding because of its high compression efficiency, but it can generate a large system load when performing encoding and decoding as the compression efficiency is large. Therefore, in the case of an image having a large data size such as a natural image, the still image encoding is performed using the JPEG encoding technique, thereby greatly reducing the amount of data to be transmitted during network transmission.

In addition, the PNG encoding scheme can improve the image quality when encoding, but the transmission speed may be lowered when the bandwidth of the transmission network is low due to a large data size. That is, in the case of an image whose image quality is not clear like a composite image but whose data size is relatively smaller than that of a natural image, the image quality of the image provided to the user can be guaranteed by still image encoding using the PNG encoding technique.

The image cloud streaming service method using the scene area characteristic according to the present invention may be implemented in a 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, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Includes all types of hardware devices that are specially configured to store and execute magneto-optical media and program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such a hardware device 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, the cloud streaming service system according to the present invention, the image cloud streaming service method using the scene region characteristic, and the apparatus therefor are not limited to the configuration and method of the embodiments described above, The embodiments may be configured such that all or some of the embodiments are selectively combined so that various modifications can be made.

According to the present invention, the scene area characteristic information corresponding to the application execution screen is received along with the application execution screen from the web server, the application execution screen is rendered to capture an image corresponding to the changed part, To still image encoding and transmitting the still image to the user's terminal using at least one still image encoding technique corresponding to the still image encoding method. In addition, since the still image encoding suitable for the image can be performed based on the scene area characteristic information without performing the image processing process on the captured image in the image-based cloud streaming service, the system can be operated more efficiently , It is possible to provide the service to the users more quickly.

110, 310: Cloud streaming server 120, 320: Web server
130-1 to 130-N, 330: Terminal 140: Network
210, 311: Receiving unit 220, 312:
230, and 313: encoding unit 240 and 314:
250: storage unit 410: application execution screen
411, 412: Poster 510: Thin Area Characteristic Information
511, 512: coordinate information 610: previous frame
620: current frame 630: captured image

Claims (10)

A receiving unit for receiving scene area characteristic information corresponding to the application execution screen together with an application execution screen from a web server;
A capture unit for rendering the application execution screen and capturing an image corresponding to the changed portion;
An encoding unit for selecting at least one still image encoding scheme corresponding to the image based on the scene area characteristic information to still image encode the image; And
A transmitting unit for transmitting the still image encoded image to a terminal of a user,
Wherein the server comprises: The method according to claim 1,
The encoding unit
Acquiring coordinates of a characteristic region classified according to an image characteristic in the scene characteristic information and comparing whether there is an area corresponding to the characteristic region among the regions corresponding to the image to determine whether the at least one still image encoding technique Wherein the server is configured to select a cloud streaming server. The method of claim 2,
The encoding unit
And still image encoding the partial area with a still image encoding technique selected corresponding to the image characteristic of the characteristic area when a part of the area corresponding to the image corresponds to the characteristic area. The method of claim 3,
The image characteristic
A natural image, and a composite image. &Lt; Desc / Clms Page number 13 &gt; The method of claim 4,
The encoding unit
Wherein the partial area is still image encoded using a Joint Photographic Experts Group (JPEG) encoding method when the image characteristic corresponds to the characteristic area, which is the natural image, Wherein the still image encoding unit partially encodes the still image using a Portable Network Graphics (PNG) encoding scheme when the image is a characteristic region of an image. The method of claim 5,
The encoding unit
And still image encodes the image with any still image encoding technique corresponding to a predetermined default technique when the image does not correspond to the characteristic region. The method according to claim 1,
The capture unit
And the image capture unit compares a plurality of frames corresponding to the application execution screen to capture the image. The method of claim 7,
The capture unit
Comparing the current frame and the previous frame among the plurality of frames, and capturing the image when the current frame is changed. Receiving scene area characteristic information corresponding to the application execution screen together with an application execution screen from a web server;
Rendering the application execution screen and capturing an image corresponding to the changed portion;
Selecting at least one still image encoding technique corresponding to the image based on the scene area characteristic information to still image encode the image; And
Transmitting the still image encoded image to a user terminal
Wherein the image cloud streaming service method comprises: The method of claim 8,
The encoding step
Obtaining coordinates of a characteristic region classified according to image characteristics in the scene area characteristic information; And
Comparing whether there is an area corresponding to the characteristic area among the areas corresponding to the image,
And selecting the at least one still image encoding scheme according to the comparison result.

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