KR101228319B1 - Appratus and mthod for overlay of images in video presenting system having embedded operationg system and there of driving method - Google Patents

Abstract

The present invention is an embedded OS for mounting the embedded system for the purpose of device control to the real imager, which is an optical image electronic equipment, and to display the image generated from the real imager and the image received from the embedded system by signal processing in one graphics engine An apparatus and method for overlaying an image on a real image system equipped with the same. In the real image system equipped with an embedded OS, when the main image and the sub image are selected for the generated first image and the received second image, the apparatus for overlaying the image overlays and outputs a sub image of a predetermined size on the main image. And an embedded means for transmitting the overlay information to the real image means together with the second image through periodic communication with the real image means and the real image means.

Physical imaging means, embedded means, VGA engine, graphics engine

Description

Apparatus and mthod for overlay of images in video presenting system having embedded operation g system and there of driving method}

The present invention is an embedded OS for mounting the embedded system for the purpose of device control to the real imager, which is an optical image electronic equipment, and to display the image generated from the real imager and the image received from the embedded system by signal processing in one graphics engine An apparatus and method for overlaying an image on a real image system equipped with the same.

In general, a real imager is a device for capturing a subject with a Charge Coupled Device camera and displaying it on a monitor, and is a device widely used for academic and industrial purposes. In particular, by combining a lens that can magnify a real object, such as a microscope lens, to a CD camera that captures an object in a real imager, an image in which a fine subject is enlarged can be displayed through a monitor.

An embedded system is a computing system embedded as part of another device. Unlike a typical computer, an embedded system performs only a specific purpose of computing tasks imposed on a device including itself. To this end, the embedded system includes a central processing unit, requires an operating system, and executes an application with the operating system to perform a specific task. Typically, embedded systems are embedded to control military devices, industrial devices, communication devices, set top boxes, digital televisions, home appliances such as digital cameras, and the like. Embedded systems may provide a graphical user interface (GUI) during certain tasks. The GUI is an interface that displays a menu. Embedded systems that provide a GUI store GUI image data to represent the GUI application and icons or menus for providing the GUI. When the user requests the display of the GUI, the embedded system executes the GUI application with the operating system to display an icon or menu image corresponding to the GUI image data.

In general, the real imager concept was to enlarge a document or a subject through a projector in education / meeting / presentation, and to transfer an image to a PC through a high speed serial bus such as a universal sireal bus (USB). Therefore, a PC is required for the output of the electronic document / multimedia file, and the real imager is recognized and used as an auxiliary device of the PC.

Televisions that support the PIP function may also be included in the overlay category, but this is a limited meaning overlay function with specific size and specific location. The concept of overlays in navigation or PC overlay cards is also an overlay controlled by an application within a single OS, so it is not an exact overlay.

The technical problem to be achieved by the present invention is to embed the embedded system in the real imager, embedded to enable to output two images (real live image + PC file image) generated from them overlayed on one output (output) The present invention provides an apparatus and method for overlaying an image on a real image system equipped with an OS.

Another technical problem to be achieved by the present invention is to mount an embedded system on a real imager, display an image generated by the real imager on a virtual window generated by the embedded system when performing an image overlay function, and display the image generated by the real imager. The present invention provides an apparatus and method for overlaying an image on a real image system equipped with an embedded OS that can be controlled as if it is an image generated in an embedded system.

In the real image system equipped with an embedded OS for solving the technical problem to be achieved by the present invention, when the main image and the sub image is selected for the generated first image and the received second image, Real image means for outputting by overlaying a sub-image having a predetermined size on the main image; And embedded means for transmitting overlay information to the real image means together with the second image through periodic communication with the real image means.

According to an aspect of the present invention, there is provided a method of overlaying an image in a real image system equipped with an embedded OS for realizing the above technical problem. A method of operation of a system comprising an embedded means for transmitting the second image to the real image means via periodic communication with the real image means, the method comprising: (a) the first image or from the real image means or the embedded means; Receiving a main image and a sub image selection signal with respect to the second image; (b) the embedded means transmitting overlay information including the size and position of the image to be overlaid to the real picture means; And (b) the real image means processes the first image or the second image selected as the main image as a displayable signal, and processes the first or second image selected as the sub image according to the overlay information. It is preferable to include the step of outputting the overlay on the main image.

In the real image system equipped with an embedded OS for solving the other technical problem to be achieved by the present invention, the device for overlaying the image is requested to overlay the generated first image and the received second image, Real image means for receiving a main image and a sub image selection signal for an image and a second image, displaying the sub image in a virtual window having a predetermined size, and outputting the overlayed image on the main image; And embedded means for transmitting the second image to the real image means through periodic communication with the real image means, and generating a virtual window in which the sub image is to be displayed by an overlay request and transmitting the virtual window to the real image means. It is preferable to include.

According to an aspect of the present invention, there is provided a method of overlaying an image in a real image system equipped with an embedded OS for realizing the above technical problem. An operating method of a system comprising an embedded means for transmitting the second image to the real image means through periodic communication with the real image means, the method comprising: (a) when an image overlay is requested, the first image from the embedded means; And receiving a main image and a sub image selection signal for the second image. (b) receiving and displaying a virtual window from the embedded means; And (c) displaying the sub-image on the virtual window of a predetermined size and then overlaying and displaying the sub-image on the main image.

As described above, according to the present invention, the hardware associated with the embedded OS is mounted on a physical imager that cannot exceed the scope of a PC, so that two images (real live images + PC file images) generated from different sources are stored in one. If the output is overlaid on the output, the embedded system does not go through the processor inside the CPU and implements the overlay function at the final output stage so that the CPU load of the embedded system is hardly generated. In this case, two images can be overlaid and output without any application.

By reproducing documents / multimedia files without a PC, students can utilize various audio-visual materials along with actual images in the education market. For example, in conducting biology class such as ant house observation / frog dissection, the relevant theoretical background will be explained as document image, and the actual prepared anthill / frog will be taken as live image in the field and overlayed with document image for display. In addition, the educational effect can be maximized, and all the materials required by modern classrooms can be used by reproducing the existing audiovisual materials.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a view showing a real image system equipped with an embedded OS according to the present invention, which includes a real image means 1 having an embedded means and a display unit 2 displaying a subject image b.

In the present invention, the real image means 1 includes keys such as an image sensing unit 11, illuminators 12a and 12b, a support 13, a lock button 14, a subject 15, An input unit 16a, a mouse 16b and a remote controller 16c, a remote receiving unit 17 and a subject 18a.

The image sensing unit 11 capable of moving back and forth can be provided with an optical system and a photoelectric conversion unit. The optical system for optically processing light from the subject 18a has a lens portion and a filter portion. A photoelectric conversion unit of a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) converts light incident from a subject through an optical system into an electrical analog signal.

The user can press the lock button 14 to move the post 13. Another illuminating device is built in the lower part of the image pick-up 15. The key input unit 16a or the mouse 16d is used to control the driving of each unit such as the image sensing unit 11 and the lighting devices 12a and 12b by a user's operation. On the other hand, the user can control the driving of each part such as the image sensing unit 11 and the illuminating devices 12a and 12b by operating the remote controller 16c and inputting the control signal to the remote receiving unit 17. [

FIG. 2 is an internal configuration diagram of a real image system equipped with the embedded OS disclosed in FIG. 1, which includes a display unit 2, a real image unit 100, and an embedded unit 200. By integrating with the image means 100, not only live video output but also various PC files can be reproduced, and two images (real live video + PC file video) generated from different sources are overlayed on one output. To be printed.

In the present invention, the real image means 100 includes an image sensing unit 11, a key input unit 16a as the input unit 16, a remote controller 16c, a DSP (digital signal processor) 101, a first SDRAM (synchronous). dynamic random access memory (103), field programmable gate array (FPGA) 105, video graphic array (VGA) engine 107, and microcomputer 109.

In the present invention, the embedded means 200 is a mouse 16b as the input means 16, portable storage 201, network 203, the second SDRAM 205, graphics engine 207, CPU core (core) 209 and a speaker 211.

The microcomputer 109 of the real image means 100 and the CPU core 209 of the embedded means 200 transmit and receive data with each other through periodic communication. Replace it.

First, the image sensing unit 11 will be described. The image sensing unit 11 optically processes light from the subject 18a and converts the light into an analog signal.

The DSP 101 converts the live video signal of the subject 18a converted from the image sensing unit 11 into a digital signal, and performs various signal processing for display. The DSP 101 removes the black level caused by the dark current generated in the CCD or CMO sensitive to the temperature change, and performs a gamma correction for encoding information according to the nonlinearity of human vision. The DSP 101 performs CFA interpolation to interpolate the Bayer pattern implemented by the RGRG line and the GBGB line of the gamma corrected predetermined data into the RGB line. The DSP 101 converts the interpolated RGB signal into a YUV signal, sharpens the image by filtering the Y signal by a high band filter, and corrects color values of the U and V signals using a standard color coordinate system. Color correction is performed to remove these noises.

The first SDRAM 103 as a frame memory stores the live video signal processed by the DSP 101 in units of frames.

The FPGA 105 is a memory controller and provides the VGA engine 107 with a live image stored in the first SDRAM 103 frame by frame.

The VGA engine 107 is an image output unit, which converts an image received from the FPGA 105 into an analog composite image signal and outputs it to the display unit 2. In addition, the VGA engine 107 converts the document / multimedia file image received from the embedded means 200 into an analog composite image signal and outputs it to the display unit 2. Then, the VGA engine 107 performs signal processing for scaling or converting the frame image received from the FPGA 105 and the document / multimedia image received from the embedded means 200 and converting the frame rate, and then overlays the image. The signal is converted into an analog composite video signal and output to the display unit 2. In another embodiment, the VGA engine 107 displays a sub image (eg, a live image) in a virtual window of a predetermined size transmitted from the embedded means 200, and then displays a main image (eg, a document / multimedia image). ) Is overlaid and output to the display unit 2.

The microcomputer 109 serving as the first control unit in the real image system of the present invention controls the operation of the entire real image means 100 and periodically communicates with the embedded means 200. In particular, the microcomputer 109 receives the overlay request signal from the key input unit 16a and the remote controller 16c and, according to the overlay information received from the embedded means 200, the live image received from the FPGA 105 and the embedded means. The VGA engine 107 is controlled to overlay the document / multimedia image received from the 200. Here, the overlay information is the size and position data of the image to be overlaid. In addition, the microcomputer 109 may reset the CPU core 209 of the embedded means 200 when an unexpected software error occurs. In another embodiment, the microcomputer 109 displays a sub image (eg, a live image) in a virtual window of a predetermined size received from the embedded means 200, and then displays the main image (eg, a document / multimedia image). The VGA engine 107 is controlled to be overlaid.

Next, referring to the embedded means 200, the removable portable storage unit 201 stores the document / multimedia file image, and the network 203 receives the document / multimedia file image from the outside, or the document / multimedia to the outside. Send the file image.

The second SDRAM 205 is stored in the portable storage unit 201 under the control of the CPU core 209, or stores the document / multimedia file image received from the network 203 and received from the FPGA 105. Save a still image or video for the image.

The graphics engine 207, under the control of the CPU core 209, receives the document / multimedia file image stored in the second SDRAM 205, converts the image into a digital image, and outputs it to the VGA engine.

The CPU core 209 serving as the second control unit in the real image system of the present invention controls the operation of the entire embedded means 200 and periodically communicates with the microcomputer 109 of the real image means 100.

In particular, when the CPU core 209 receives the overlay request signal of the mouse 16b, the CPU core 209 transmits it to the microcomputer 109 and, upon image overlay, generates overlay information (size and position data of the image to be overlayed). Transfer to the microcomputer 109. In addition, the CPU core 209 controls the audio signal of the image displayed on the display unit 2 to output to the speaker 211. As another example, when the CPU core 209 receives the overlay request signal of the mouse 16b, the CPU core 209 generates a virtual window on which the sub-image is to be displayed and transmits the virtual window to the microcomputer 109. The CPU core 209 receives the virtual window change signal (drag, size change) of the mouse 16b and transmits the virtual window change information to the microcomputer 109 accordingly. Virtual window changes can be displayed via window messages.

In the image overlay implementation, the graphics engine 207 of the CPU core 209 controlling electronic / multimedia image playback cannot even know the presence of the overlay screen. Because the overlay function is implemented in the VGA engine 107 under the control of the microcomputer 109, the graphics engine 207 can know the existence of the overlay screen unless the microcomputer 109 informs the CPU core 209 of this. none. Therefore, this limitation is overcome through communication using a vertical synchronization signal.

FIG. 3 is a block diagram illustrating a configuration of an image overlay apparatus according to a first embodiment of the present invention among the systems of FIG. 2. The first frame buffer 107-1 storing the image A, the second frame buffer 107-2 storing the document / multimedia image B, and the VGA engine 107 are converted by overlay signal processing. And a third frame buffer 107-3 storing the live image A and the document / multimedia image B.

4 is a flowchart illustrating a method of an image overlay operation according to a first embodiment of the present invention among the systems of FIG. 2, which will be described below in connection with FIG. 3.

In order to execute the image overlay, the VGA engine 107 stores the live image A generated by the real image means 100 in the first frame buffer 107-1 under the control of the microcomputer 109. The live image B generated in operation 200 is stored in the second frame buffer 107-2 (step 401).

The VGA engine 107 stores the live image A input through the image sensing unit 11, the DSP 101, and the FPGA 105 in the first frame buffer 107-1. The VGA engine 107 stores the document / multimedia image B input through the portable storage 201 or the network 203 and the graphics engine 207 in the second frame buffer 107-2.

The microcomputer 109 or the CPU core 209 receives the main image and the sub image selection signals through the input unit 16 (step 403).

The microcomputer 109 receives the input of the key input unit 16a and the remote controller 16c to receive the main image and the sub image selection signals, and the CPU core 209 receives the input of the mouse 16b to receive the main image and the sub image. Receive an image selection signal. The microcomputer 109 and the CPU core 209 communicate with each other by selecting the main image and the sub image while performing communication in a vertical synchronization signal cycle. In the present invention, it is assumed that the main image is selected as the document / multimedia image B and the sub image is selected as the live image A for convenience of description. However, the live image A may be selected as the main image, and the document / multimedia image B may be selected as the sub image. In this process, the CPU core 209 transmits the size and position data of the sub-image to be overlaid on the microcomputer 109 to the microcomputer 109.

When the selection of the main image and the sub image is completed, the microcomputer 109 determines whether the image stored in the first frame buffer 107-1 and the second frame buffer 107-2 matches the image format to be finally output ( Step 405).

If the images stored in the first frame buffer 107-1 and the second frame buffer 107-2 do not match the image format to be finally output, the microcomputer 109 controls the VGA engine 107 to be finally output. Signal processing is controlled to match the video format (step 407).

In FIG. 5, under the control of the microcomputer 109, the VGA engine 107 may finally output the live image A, that is, the sub image according to the size and position data of the sub image to be overlaid received from the CPU core 209. The content of signal processing to match the video format is shown. The live image A stored in the first frame buffer 107-1 is scaled and frame rate-converted to a size suitable for overlay output by the VGA engine 107 and stored in the third frame buffer 107-3.

FIG. 6 shows the signal processing of the VGA engine 107 so that the document / multimedia image B, that is, the main image, matches the image format to be finally output, under the control of the microcomputer 109. As shown in FIG. 6A, the document / multimedia image B stored in the second frame buffer 107-2 is scaled and frame-rate converted to match the image format that is to be finally output from the VGA engine 107, that is, the main image format. As shown in FIG. 6B, the third frame buffer 107-3 is stored. For example, if the document / multimedia image B stored in the second frame buffer 107-2 is (1024 × 768 @ 75Hz) and the final image format to be output is (1280 × 1024 @ 60Hz), the VGA engine 107 converts the document / multimedia image B stored in the second frame buffer 107-2 into a format of (1280 × 1024 @ 60Hz) and stores it in the third frame buffer 107-3.

When the storage of the processed live image A and the document / multimedia image B to the third frame buffer 107-3 is completed, the microcomputer 109 serves on the document / multimedia image B as the main image. The live image A as an image is overlaid and output to the display unit 2 (step 409).

7 illustrates an example of an overlay image reproduced on the display unit 2. FIG. 7A shows a live image A, which is a sub-image displayed on the display unit 2, and FIG. 7B shows a signal processed by the VGA engine 107 on a document / multimedia image B, which is a main image, so that its position and size may be changed. The converted live image A is overlaid and displayed.

FIG. 8 is a block diagram illustrating a configuration of an image overlay apparatus according to a second exemplary embodiment of the present invention, and includes a display unit 2, a mouse 16b, a VGA engine 107, a microcomputer 109, Portable storage 201, network 203, graphics engine 107, and CPU core 209.

In the image overlay implementation, the graphics engine 207 of the CPU core 209 controlling electronic / multimedia image playback cannot even know the presence of the overlay screen. Because the overlay function is implemented in the VGA engine 107 under the control of the microcomputer 109, the graphics engine 207 can know the existence of the overlay screen unless the microcomputer 109 informs the CPU core 209 of this. none. Therefore, this limitation is overcome through the communication and virtual window in which the vertical synchronization signal is cycled.

FIG. 9 is a flowchart illustrating a method of an image overlay operation according to a second embodiment of the present invention among the systems of FIG. 2 and will be described below in connection with FIG. 3.

First, the CPU core 209 of the embedded means 200 receives an image overlay function selection signal by inputting the mouse 16b (step 901).

When the image overlay function is selected, the CPU core 209 receives a main image and a sub image selection signal by the input of the mouse 16b (step 903).

The microcomputer 109 and the CPU core 209 communicate with each other by selecting the main image and the sub image while performing communication in a vertical synchronization signal cycle. In the present invention, it is assumed that the main image is selected as the document / multimedia image B and the sub image is selected as the live image A for convenience of description.

When the selection of the main image and the sub image is completed, the CPU core 209 generates and outputs a virtual window on the display unit 2 (step 905).

FIG. 10A illustrates a virtual window (VW) generated by the CPU core 209 on the document / multimedia image B selected as the main image. The virtual window VW generated by the CPU core 209 is transmitted to the VGA engine 107 through periodic communication with the microcomputer 109. Here, the virtual window (VW) is provided in a dummy form, it has a form that can be moved and changed size using the drag and drop of the mouse (16b). In addition, the virtual window (VW) is set to have the highest attribute is located above the main image.

The CPU core 209 captures the coordinates and the size of the current virtual window VW and transmits them to the microcomputer 109 (step 907).

The CPU core 209 calculates the coordinates and the size of the virtual window VW as shown in FIG. 10A and transmits them to the microcomputer 109.

Subsequently, the microcomputer 109 controls the VGA engine 107 to overlay the live image A as a sub image on the virtual window VW generated on the document / multimedia image B as the main image (step 909). .

The microcomputer 109 receives the coordinates of the virtual window VW from the CPU core 209 and controls the VGA engine 107 so that the sub-image is displayed on the virtual window VW. Under the control of the microcomputer 109, the VGA engine outputs the main image to the display unit 2, outputs the sub image to the virtual window, and overlays the main image on the main image. FIG. 10B shows that the live image A selected as the sub image is displayed in the virtual window VW on the document / multimedia image B selected as the main image.

Subsequently, the CPU core 209 determines whether the position and size of the virtual window VW have been changed from the mouse 16b (step 911).

 As described above, the virtual window (VW) is provided in a dummy form, it is possible to move and change the size using the drag and drop of the mouse (16b). When the size and position of the virtual window VW are changed by dragging and dropping the mouse 16b, the CPU core 209 captures the coordinates and the size of the changed virtual window VW and transmits them to the microcomputer 109. The microcomputer 109 then controls the VGA engine 107 to display the sub-image in the changed virtual window VW.

Thereafter, the CPU core 209 determines whether to maintain the overlay function (step 913), and when the overlay function is turned off, the CPU core 209 causes the virtual window VW to disappear from the display unit 2 (915). step).

The virtual window VW has a hidden property when the overlay function is turned off and disappears from the display unit 2.

1 is a view showing a real image system equipped with an embedded OS for image overlay according to the present invention.

2 is an internal block diagram of the system disclosed in FIG.

3 is a block diagram illustrating a configuration of an image overlay apparatus according to a first embodiment of the present invention among the systems of FIG. 2.

4 is a flowchart illustrating an operation of an image overlay method according to a first embodiment of the present invention among the systems of FIG. 2.

5 is a diagram illustrating signal processing of a live image in FIGS. 3 and 4.

FIG. 6 is a diagram illustrating signal processing of a document / multimedia image in FIGS. 3 and 4.

FIG. 7 is a diagram illustrating an example of an overlay image reproduced in a display unit in FIGS. 3 and 4.

FIG. 8 is a block diagram illustrating a configuration of an image overlay apparatus according to a second embodiment of the present invention among the systems of FIG. 2.

FIG. 9 is a flowchart illustrating an operation of a method of an image overlay apparatus according to a second embodiment of the present invention among the systems of FIG. 2.

FIG. 10 is a diagram illustrating an overlaid virtual window generated in a display unit in FIGS. 8 and 9.

Claims (18)

Real image means equipped with an embedded means; And It includes; display unit, The real image means When a main image and a sub image are selected with respect to the generated first image and the second image received from the embedded means, the sub image having a predetermined size is overlaid and output on the main image. The embedded means And overlay information including the size and position of the second image and the sub-image to be overlaid to the real-image means through periodic communication with the real-image means. The method of claim 1, The first image is a live image generated by the real image means, And the second image is a document / multimedia image received by the embedded means from the outside. The physical imaging means according to claim 1, wherein VGA engine which processes the first image or the second image selected as the main image as a displayable signal, and processes the first or second image selected as the sub image according to the overlay information and overlays and outputs the image on the main image ; And a controller which periodically communicates with the embedded means to transmit second image and overlay information from the embedded means to the VGA engine, and controls signal processing of the VGA engine according to the selected main image and sub-image. And an image overlay device. The method of claim 3, A first storage unit which stores a first image generated by the real image means; A second storage unit storing a second image received from the embedded means; And And a third storage unit for storing the signal processed first and second images output from the VGA engine. According to claim 1, The real picture means and the embedded means And an input unit for inputting the image overlay request input, the main image, and the sub-image selection signal, respectively. Real image means for signal-processing and displaying the generated first image and the received second image; and transmitting the second image to the real image means through periodic communication with the real image means mounted on the real image means. As an operating method of a system comprising an embedded means, (a) receiving a main image and a sub image selection signal for the first image or the second image from the real image means or the embedded means; (b) transmitting, by the embedded means, overlay information including the size and position of the sub-image to be overlaid to the real picture means; And (c) the real image means processes the first image or the second image selected as the main image as a displayable signal, and processes the first or second image selected as the sub image according to the overlay information to perform the signal processing. Image overlay method comprising the step of outputting the overlay on the main image. The method according to claim 6, The first image is a live image generated by the real image means, And the second image is a document / multimedia image received by the embedded means from the outside. Real image means equipped with an embedded means; And It includes; display unit, The real image means When an overlay is requested for the generated first image and the second image received from the embedded means, the main image and the sub-image selection signals for the first image and the second image are received, and the virtual window of the predetermined size is displayed. After displaying the sub-images and outputs the overlay on the main image, The embedded means The second image is transmitted to the real image means through periodic communication with the real image means, and the virtual image is generated by generating an virtual window including size and position information on which the sub image is to be displayed by an overlay request. Image overlay apparatus, characterized in that the transmission by means. 9. The method of claim 8, The first image is a live image generated by the real image means, And the second image is a document / multimedia image received by the embedded means from the outside. 9. The physical imaging means according to claim 8, wherein A VGA engine configured to perform display signal processing of the sub image on the display of the selected main image and the virtual window, and perform display signal processing of the sub image according to the size and position of the virtual window received from the embedded means; And a controller which periodically communicates with the embedded means to transmit second image and overlay information from the embedded means to the VGA engine, and controls signal processing of the VGA engine according to the selected main image and sub-image. And an image overlay device. The method of claim 10 wherein the embedded means Input means for inputting the overlay request signal and the virtual window change signal; A graphics engine configured to process the second image as a displayable signal according to the overlay request signal and transmit the same to the VGA engine; And Periodic communication with the real picture means is performed, and when an overlay request signal is received by the input means, the virtual window is generated and transmitted to the real picture means, and the size of the virtual window is changed by the virtual window change signal. And a second controller which changes a position and sends the same to the real image means. 9. The method of claim 8, And when the overlay request is turned off, ending the display of the virtual window. 9. The method of claim 8, The virtual window is an image overlay apparatus, characterized in that the highest attribute is displayed on top of any image. Real image means for signal-processing and displaying the generated first image and the received second image; and transmitting the second image to the real image means through periodic communication with the real image means mounted on the real image means. As an operating method of a system comprising an embedded means, (a) receiving a main image and a sub image selection signal for the first image and the second image from the embedded means when an image overlay is requested; (b) receiving and displaying, from the embedded means, a virtual window including size and position information on which the sub-image is to be displayed; And and (c) displaying the sub-image on the virtual window of a predetermined size and overlaying and displaying the sub-image on the main image. 15. The method of claim 14, The first image is a live image generated by the real image means, And the second image is a document / multimedia image received by the embedded means from the outside. 15. The method of claim 14, and (d) terminating the display of the virtual window when the overlay request is turned off from the embedded means. The method of claim 14, wherein in step (b): The image overlay method, characterized in that for changing the size and position of the virtual window from the embedded means to transmit to the real picture means. 15. The method of claim 14, The virtual window is an image overlay method, characterized in that the highest attribute is displayed on top of any image.

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