KR102020619B1 - Method for displaying watermark in screen and apparatus therefor - Google Patents

Abstract

The present invention relates to a method for displaying a watermark on a certain area of a screen currently being output and an apparatus therefor. One or more processors, in accordance with an embodiment of the present invention; Display devices; An electronic device comprising a memory and a program stored in the memory and configured to be executed by the one or more processors, the program comprising: an information obtaining module for obtaining identification information of the electronic device; And a first watermark generation module generating a first watermark including the acquired identification information and expressing the first watermark on a top layer in a predetermined region of a screen output from the display apparatus.

Description

Screen watermark display method and device therefor {METHOD FOR DISPLAYING WATERMARK IN SCREEN AND APPARATUS THEREFOR}

The present invention relates to a watermark display technology, and more particularly, to a method and an apparatus therefor for expressing a watermark in a predetermined area of a screen currently being output.

Watermark refers to a technology of inserting a certain code into the content in order to prevent illegal copying and illegal use of the copyrighted work. Such a watermark may be inserted as a fixed code in digital content, or may be output as a specific symbol on printed matter. Watermarks are used to protect creations and identify replication paths. The following patent document discloses a watermark embedding and detection method.

However, watermark embedding technology can protect the distribution of printed materials and digital contents, but when the computer screen is taken out and leaked to the outside, the copyright cannot be protected for the captured image and it is difficult to identify the leakage path. There is this. For example, while the user is away from his / her personal computer for a while, another user with malicious intentions photographs the computer screen with a smartphone and leaks the captured image or image to the outside. Copyright on documents, etc.) may be infringed. In particular, when the voyeurized image is security data used in an in-house computer network or the like, there is a problem that the security of the in-house computer network is compromised from external hacking. Accordingly, there is a need for enhanced security for content being output on digital screens such as computer screens.

Korean Patent Publication No. 10-2010-0091765

SUMMARY OF THE INVENTION The present invention has been proposed to solve such a conventional problem, and is a method of displaying a watermark on a screen of an electronic device that a user is using, thereby enhancing in-house security from screen voyeur and strengthening copyright of digital content. And an apparatus for this purpose.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

At least one processor, according to a first aspect of the present invention for achieving the above object; Display devices; Memory; And a program stored in the memory and configured to be executed by the one or more processors, the program comprising: an information obtaining module for obtaining identification information of the electronic device; And a first watermark generation module generating a first watermark including the acquired identification information and expressing the first watermark on a top layer in a predetermined region of a screen output from the display apparatus.

The information acquisition module acquires index information, and the program selects a pixel area in which the second watermark is inserted in the output screen, and is included in the pixel area based on a bit string included in the index information. The display apparatus may further include a second watermark generation module, wherein the second watermark generation module may change the brightness of the pixel to record the hidden watermark on the screen.

The second watermark generation module 1-to-one matching a pixel included in the pixel area with each bit included in the bit string, and sets the brightness of the pixel where the bit '1' is matched to the bit '0' among the matched pixels. The second watermark may be recorded on the screen by changing the brightness of the matched pixel relatively brighter.

The index information may be a bit string generated based on the MAC address of the electronic device, and the information acquisition module may generate the index information by itself or obtain the index information from a management server.

The second watermark generation module may identify a color boundary by analyzing a graphic image output on the screen, and select a pixel area in which the second watermark is inserted among pixels constituting the color boundary. .

The second watermark generation module analyzes the graphic image output on the screen to identify successive pixels having a brightness lower than a predetermined threshold brightness, and inserts the second watermark among the successive pixels. The pixel area can be selected.

The program may further include an interference processing module configured to monitor whether the input signal is generated on the first watermark and to transmit the input signal to an application of a lower layer.

The first watermark generation module may generate and display a first watermark including one or more of a MAC address, an IP address, a host name, and current time information of the electronic device.

According to a second aspect of the present invention, there is provided a method of displaying a watermark on a screen being output from an electronic device, the method comprising: obtaining identification information of the electronic device; Generating a first watermark including the acquired identification information; And displaying the first watermark as a top layer in a predetermined area of the screen being output.

The method includes obtaining index information; Selecting a pixel area in which the second watermark is inserted in the output screen; And changing a brightness of a pixel included in the pixel area based on the bit string included in the index information to record a second watermark in a hidden form on the screen.

The present invention has the advantage of reinforcing the copyright of digital content from the screen voyeur and in-house security by expressing the watermark identifiable in a certain area of the screen of the electronic device in the form of the highest layer.

In addition, the present invention additionally records a hidden watermark that the user cannot identify on the screen of the electronic device, so that even if the voyeurized image is distorted, the source and the copyright holder of the voyeur image can be identified through the hidden watermark. .

In addition, when the input signal is generated from the watermark displayed on the screen of the electronic device, the present invention processes the input signal as an input signal of an application existing in the lower layer, thereby interfering with the input signal generated by the watermark being placed in the uppermost layer. There is an advantage to increase the user's convenience by preventing the phenomenon.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the specific details for carrying out the invention serve to further understand the technical spirit of the present invention, the present invention described in such drawings It should not be construed as limited to matters.
1 is a diagram illustrating a screen watermark display system according to an embodiment of the present invention.
2 is a diagram illustrating a configuration of an electronic device according to an embodiment of the present invention.
3 is a diagram showing the configuration of a watermark program according to an embodiment of the present invention.
4 is a diagram illustrating a screen on which a watermark is displayed according to an embodiment of the present invention.
5 is a diagram illustrating a process of inserting a second watermark according to an embodiment of the present invention.
6 is a flowchart illustrating a method of generating and inserting a watermark on a screen in an electronic device according to an embodiment of the present invention.
7 is a flowchart illustrating a method of preventing an input interference phenomenon according to a watermark in an electronic device according to an embodiment of the present invention.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a screen watermark display system according to an embodiment of the present invention.

As illustrated in FIG. 1, the screen watermark display system according to an embodiment of the present invention includes an electronic device 100 and a management server 200, and the electronic device 100 and the management server 200 Communicate with each other via network 300. Here, the network 300 includes a mobile communication network and a wired network, which corresponds to well-known conventional techniques in the present invention, and thus detailed description thereof will be omitted.

The management server 200 stores a watermark program, provides a watermark program download service to the electronic device 100, and includes a user ID, a MAC address, an IP address, index information, etc., which downloaded the watermark program. Store and manage your information. In addition, the management server 200 may allocate and manage index information for each electronic device, and provide the index information to the electronic device 100. The index information is a unique bit string of the electronic device 100 allocated to the electronic device, and is used as basic data for generating a hidden watermark.

The management server 200 receives and stores a MAC address, an IP address, a user ID, an electronic device name, and the like from the electronic device 100 on which the watermark program is installed. When the management server 200 receives the MAC address from the electronic device 100, the management server 200 may generate index information based on the MAC address, store the index information together with the user information, and provide the index information to the electronic device 100. have. In this case, the management server 200 may generate index information by using the MAC address as a seed. In addition, the management server 200 may identify the source of the photographed image by analyzing the photographed image, confirming the watermark in the photographed image, and then identifying the electronic device 100 through the watermark.

The electronic device 100 is a device in which a watermark program is installed. The electronic device 100 inserts a watermark into a screen currently being output, and records a source of the screen image itself. The electronic device 100 may visually identify the watermark and output the watermark translucently processed on the screen to a predetermined area of the screen, and additionally display the hidden watermark generated by the index information, which is impossible to visually identify. Insert in a certain area. The electronic device 100 may download the watermark program from the management server 200 and install the watermark program. The electronic device 100 is a notebook computer, a desktop computer, a tablet computer, an IPTV, a smartphone, and the like, and any device having a processor and a memory capable of outputting multimedia, text, etc. may be adopted without limitation.

2 is a diagram illustrating a configuration of an electronic device according to an embodiment of the present invention.

As shown in FIG. 2, an electronic device 100 according to an embodiment of the present invention may include a memory 110, a memory controller 121, one or more processors 122, a peripheral interface 123, and input / output. (I / O) subsystem 130, display device 141, input device 142, and communication circuitry 152. These components communicate via one or more communication buses or signal lines. The various components shown in FIG. 2 may be implemented in hardware, software or a combination of both hardware and software, including one or more signal processing and / or application specific integrated circuits.

The memory 110 may include fast random access memory, and may also include one or more magnetic disk storage devices, nonvolatile memory such as flash memory devices, or other nonvolatile semiconductor memory devices. In some embodiments, memory 110 is a storage device located remote from one or more processors 122, such as communication circuitry 152, the Internet, an intranet, a local area network (LAN), a wide area network (WLAN). It may further comprise a network attached storage device accessed through a communication network (not shown), such as a storage area network (SAN), or the like, or a suitable combination thereof. Access to the memory 110 by other components of the electronic device 100, such as the processor 122 and the peripheral interface 123, may be controlled by the memory controller 121.

The peripheral interface 123 connects the input / output peripheral of the electronic device 100 with the processor 122 and the memory 110. One or more processors 122 execute a set of instructions stored in various software programs and / or memory 110 to perform various functions for the communication terminal 10 and to process data. In some embodiments, peripheral interface 123, processor 122, and memory controller 121 may be implemented on a single chip, such as chip 120. In other embodiments, they may be implemented in separate chips.

The I / O subsystem 130 provides an interface between the input / output peripheral of the electronic device 100, such as the display device 141, the input device 142, and the peripheral interface 123.

The display device 141 may use a liquid crystal display (LCD) technology or a light emitting polymer display (LPD) technology. The display device 141 may be a capacitive, resistive, or infrared touch display. The touch display provides an output interface and an input interface between the terminal and the user. The touch display presents visual output to the user. The visual output may include text, graphics, video, and combinations thereof. Some or all of the visual output may correspond to user interface objects. The touch display forms a touch sensitive surface that accepts user input.

The input device 142 is an input means such as a keyboard, a mouse, and the like, and receives a user input signal.

The processor 122 is a processor configured to perform operations associated with the electronic device 100 and to perform instructions, for example, input and output between components of the electronic device 100 using instructions retrieved from the memory 110. Receive and manipulate data can be controlled.

The communication circuit 152 transmits and receives signals by wire or wirelessly transmits and receives electromagnetic waves. The communication circuit 152 converts an electrical signal into an electromagnetic wave and vice versa, and communicates with a communication network, another mobile gateway, and an electronic device through the electromagnetic wave. The communication circuit 152 includes, but is not limited to, for example, an antenna system, an RF transceiver, one or more amplifiers, tuners, one or more oscillators, digital signal processors, CODEC chipsets, subscriber identity module (SIM) cards, memory, and the like. It may include known circuitry for performing this function, which is not limited. The communication circuitry 152 may comprise the Internet, called the World Wide Web (WWW), intranets and networks and / or wireless networks such as cellular telephone networks, wireless LANs and / or metropolitan area networks (MAN), and near field wireless. Communication can be made with other devices. Wireless communications include Global System for Mobile Communication (GSM), Enhanced Data GSM Environment (EDGE), wideband code division multiple access (WCDMA), code division multiple access (CDMA), time division multiple access (TDMA), and voice over Internet Protocol), Wi-MAX, Bluetooth, Zigbee, and Near Field Communication (NFC).

The software component may include an operating system 111, a graphics module (instruction set) 112, and a watermark program (instruction set) in the memory 110. The operating system 111 may be, for example, a built-in operating system such as Darwin, RTXC, LINUX, UNIX, OS X, WINDOWS or VxWorks, Android, etc., and may be a general system task (eg, memory). Management, storage device control, power management, etc.) and various software components and / or devices that facilitate and manage communication between the various hardware and software components. Graphics module 112 includes various well-known software components for presenting and displaying graphics on display device 141. The term "graphics" refers to any object that can be displayed to the user, including, without limitation, text, web pages, icons (eg, user interface objects including soft keys), digital images, videos, animations, and the like. Include.

The watermark program 113 may be downloaded and installed from the management server 200. The watermark program 113 generates a watermark and a hidden watermark in which the identification information and the time information of the electronic device 100 are expressed, and outputs the generated watermark to the display device 141.

Hereinafter, a watermark that can be visually identified and opaquely expressed in the form of a top layer is referred to as a first watermark, and a watermark that cannot be visually identified and inserted into a specific area on the screen due to brightness difference is referred to as a second watermark. It describes by reference.

3 is a diagram showing the configuration of a watermark program according to an embodiment of the present invention.

As shown in FIG. 3, the watermark program 113 according to an embodiment of the present invention includes an information acquisition module 31, a first watermark generation module 32, a second watermark generation module 33, and An interference processing module 34 is included, and each module may be mounted in the electronic device 100 when the watermark program is installed.

The information obtaining module 31 obtains identification information of the electronic device such as a MAC address, an IP address, an electronic device name (eg, a host name) of the electronic device 100, and the like. In addition, the information acquisition module 31 may obtain a company name to which the user belongs. The company name and the computer name may be input from the user when the watermark program is installed, or may be obtained through a host name and affiliation name (or group name) recorded in the operating system 111.

In addition, the information acquisition module 31 may receive index information from the management server 200. In this case, the information obtaining module 31 may provide the MAC address of the electronic device 100 to the management server 200 and receive index information generated based on the MAC address from the management server 200. As another embodiment, the information acquisition module 31 may generate index information itself based on the MAC address of the electronic device 100. The index information may be a bit string equal to or shorter than the length of the MAC address, and may be a bit string generated by using the MAC address as a seed. In addition, the index information may be a MAC address. In this case, the information acquisition module 31 does not request the index information from the management server 200 and uses the MAC address itself as index information.

The first watermark generation module 32 generates a first watermark based on the device identification information acquired by the information acquisition module 31 and displays the first watermark in a predetermined area of the screen of the display device 141. do. That is, the first watermark generation module 32 may include the first water including the device identification information acquired by the information acquisition module 31, that is, the MAC address, the IP address, the electronic device name (eg, the host name), and the time information. A mark is generated, and the first watermark is displayed in a predetermined region of the display device 141 in the form of a top layer. In this case, the first watermark generation module 32 may display the same on the plurality of areas of the display apparatus 141 and update the time information expressed in the first watermark in real time. The number and areas in which the first watermark is displayed may be set by the user, and may be automatically set when the watermark program 113 is installed.

In addition, the first watermark generation module 32 may process the first watermark opaquely and output the first watermark to the uppermost layer of the display device 141 according to a preset transparency. The transparency setting for the first watermark may be set directly by the user, or may be automatically set when the watermark program 113 is installed. As the first watermark is displayed on the uppermost layer, the first watermark is always displayed on the screen of the display device 141 regardless of a user's work.

4 is a diagram illustrating a screen on which a watermark is displayed according to an embodiment of the present invention.

As illustrated in FIG. 4, the first watermark generation module 32 may include first watermarks 41a and 41b including a MAC address, an IP address, an electronic device name (eg, a host name), and time information. Outputs the top layer in the upper center area of the screen and the lower right area of the screen. The first watermarks 41a and 41b are opaquely processed according to the set transparency, thereby expressing an application output in the immediately following layer. In addition, the first watermark generation module 32 updates the time information included in the first watermark in real time. That is, the first watermark generation module 32 synchronizes the actual time and the time information output to the first watermarks 41a and 41b.

In this state in which the first watermark is output to the display device 141, even if another person secretly photographs the screen, the first watermarks 41a and 41b are recorded in the captured screen image to confirm the photographed image. This allows us to identify the source of the image and the route of leakage.

The second watermark generation module 33 inserts a second watermark which is not recognized by the naked eye into a specific area of the screen based on the index information. In detail, the second watermark generation module 33 analyzes the screen image currently displayed on the display device 141 and selects a region into which the second watermark is inserted.

As an exemplary embodiment, the second watermark generation module 33 analyzes the screen image currently output from the display device 141, and then checks the consecutive pixels darker than a preset threshold brightness in the screen image, and the continuous watermark. The region in which the second watermark is inserted is selected among the pixels. In this case, the second watermark generation module 33 selects pixels having the same length as the bit string length of the index information among the consecutive pixels, and selects the selected pixels as an area in which the second watermark is inserted. do. For example, when the bit string of the index information is 48 bits, the second watermark generation module 33 designates 48 consecutive pixels among successive pixels darker than the threshold brightness to the area where the second watermark is inserted. Can be selected. In addition, the second watermark generation module 33 may select a plurality of insertion regions, and may limit the number of insertion regions selected to a maximum number (for example, ten) when there are too many regions smaller than the threshold brightness. . The second watermark generation module 33 checks the red-green-blue (RGB) of each pixel in the screen image and converts the RGB value of each pixel into a hue-saturation-brightness (HSB) value. After checking the value, consecutive pixels darker than the threshold brightness may be identified among the continuous pixel areas based on the HSB value.

In another embodiment, the second watermark generation module 33 checks the RGB value of each pixel in the screen image, analyzes the RGB value, checks the boundary of the color, and then consecutive pixels forming the boundary surface. The second watermark insertion region may be selected from among them. In this case, the second watermark generation module 33 selects consecutive pixels having the same length as the bit string length of the index information among the pixels forming the color boundary as the region into which the second watermark is inserted. The second watermark generation module 33 may identify the pixel area where the RGB value is different from the surrounding RGB value by more than the threshold value as the color boundary.

As another embodiment, one or more pixel regions into which the second watermark is inserted may be preset, and in this case, the second watermark generation module 33 may identify the preset second watermark pixel region, An insertion area of the second watermark may be selected from the screen image.

In FIG. 4, reference numerals 42a and 42b indicate areas in which the second watermark is to be inserted, and one or more second watermark insertion areas may be selected from the screen image.

When the insertion region is selected, the second watermark generation module 33 records the second watermark hidden in the insertion region. At this time, the second watermark generation module 33 checks the bit string included in the index information, matches the bit string one-to-one with the pixel of the insertion region, and then adjusts the brightness of the pixel matched with the bit '1'. The second watermark may be written in the corresponding insertion area by changing the brightness higher than the brightness of the pixel matched with the 0 'bit.

5 is a diagram illustrating a process of inserting a second watermark according to an embodiment of the present invention.

Assuming that the index information is '1010011001', for example, referring to FIG. 5, the second watermark generation module 33 matches each pixel of the insertion region with a bit of the index information one-to-one, The brightness of the pixel matched with bit '1' among the pixels is changed to be relatively higher than the neighboring pixel matched with the '0' bit (that is, the pixel matched with the '0' bit and positioned closest to the bit '1'). As shown in FIG. 5, the second watermark generation module 33 sets a brightness of a pixel matched with bit '1' to a preset relative value (eg, 20%) than the brightness of the pixel matched with bit '0'. You can change the RGB or HSB of the pixel to be as high as).

As described above, the brightness of the pixel is changed according to the bit string of the index, so that the second watermark is inserted in a hidden form as if it is a barcode. The display of the area of the second watermark is difficult for the user to visually check through the screen, and may be identified through analysis of the management server 200. That is, the management server 200 identifies an area in which the second watermark is inserted in the captured image and extracts index information (ie, a bit string) from the second watermark insertion area through a brightness difference. In addition, the management server 200 may check the electronic device 100 corresponding to the index information in a database to determine the source of the captured image.

Meanwhile, the second watermark generation module 33 may select a plurality of watermark insertion regions, and insert the same second watermark into each insertion region by changing the brightness of the plurality of insertion regions. The plurality of insertion areas may be selected to be adjacent to up / down or left / right from among pixel areas of the screen, and may be located in non-adjacent spaces. In this case, the second watermark generation module 33 may insert the same second watermark in each insertion area. When the same second watermark is inserted in the plurality of regions, the electronic device 100 can be identified through the second watermark inserted in another region even if the voyeur image of the specific region is distorted.

The interference processing module 34 performs a function of preventing an input interference phenomenon generated by the watermark displayed on the uppermost layer. That is, when the touch or the mouse is input on the first watermark, the interference processing module 34 transmits the input signal to an application (that is, a window or a menu) located on a layer behind the first watermark, and thus, the first watermark. This prevents input interference that occurs when and another work window overlap.

6 is a flowchart illustrating a method of generating and inserting a watermark on a screen in an electronic device according to an embodiment of the present invention.

Referring to FIG. 6, when the electronic device 100 operates, the information acquisition module 31 collects and acquires identification information of the electronic device such as a MAC address, an IP address, and an electronic device name (S601).

Subsequently, the first watermark generation module 32 generates a first watermark including a MAC address, an IP address, an electronic device name (eg, a host name) and current time information obtained from the information acquisition module 31. In operation S603 and S605, the first watermark is displayed as the uppermost layer on a predetermined screen area of the display apparatus 141. FIG. In this case, the first watermark generation module 32 may simultaneously display the first watermark on a screen in a plurality of areas. In addition, the first watermark generation module 32 may process the first watermark opaquely and display it on the top layer of the screen based on the set transparency. In addition, the first watermark generation module 32 synchronizes the time information represented by the first watermark with the current time so that the time information recorded in the first watermark is changed in real time.

Next, the information acquisition module 31 generates index information based on the generation of the second watermark by itself or acquires the index information in association with the management server 200 (S607). The information acquisition module 31 may provide the MAC address of the electronic device 100 to the management server 200 and receive index information generated based on the MAC address from the management server 200. Alternatively, the information acquisition module 31 may itself generate index information based on the MAC address of the electronic device 100. As another embodiment, the information acquisition module 31 may obtain the MAC address itself as index information.

Then, the second watermark generation module 33 analyzes the screen image currently displayed on the display device 141 and selects a region into which the second watermark is inserted (S609).

In one embodiment, the second watermark generation module 33 checks successive pixels darker than a predetermined threshold brightness in the screen image, and selects pixels corresponding to the bit string length of the index information among the successive pixels. The second watermark may be selected as an area in which the second watermark is inserted. At this time, the second watermark generation module 33 checks the red-green-blue (RGB) of each pixel in the screen image, and converts the RGB value of each pixel into a hue-saturation-brightness (HSB) value for each pixel. The HSB value may be checked, and consecutive pixels darker than the threshold brightness may be identified among the continuous pixel areas based on the HSB value.

In another embodiment, the second watermark generation module 33 checks the RGB value of each pixel in the screen image, analyzes the RGB value, checks the boundary of the color, and then consecutive pixels forming the boundary surface. The pixels corresponding to the bit string length of the index information may be selected as the region where the second watermark is inserted. The second watermark generation module 33 may recognize the pixel area where the RGB value is different from the surrounding RGB value by more than the threshold value as the color boundary.

As another embodiment, the pixel regions into which the second watermark is inserted may be preset, and in this case, the second watermark generation module 33 may identify the second watermark pixel region previously set, thereby obtaining a second watermark. An insertion area of the watermark can be selected from the screen image.

The second watermark generation module 33 may select a plurality of second watermark insertion regions.

When the insertion region is selected, the second watermark generation module 33 inserts the second watermark hidden in the insertion region (S611). At this time, the second watermark generation module 33 checks the bit string included in the index information, matches each bit of the bit string with the pixel of the insertion region one-to-one, and then brightness of the adjacent pixel matched with '0'. The brightness of the pixel matched with '1' is changed to a higher value, and the second watermark is recorded in the corresponding insertion area.

The process according to FIG. 6 corresponds to one cycle of the watermark, and the second watermark may be periodically generated and inserted into the screen image when a screen change event occurs. That is, when a screen change event occurs in which a specific work window such as MS Word, Korean, PowerPoint, Excel, Photoshop, etc. is newly displayed on the screen, or when a new web browser is created by accessing an internal server or an external server, The watermark generation module 33 may analyze the screen image and insert a new watermark into the current screen image.

7 is a flowchart illustrating a method of preventing an input interference phenomenon according to a watermark in an electronic device according to an embodiment of the present invention.

Referring to FIG. 7, the interference processing module 34 monitors an input signal generated by the electronic device 100 (S701). That is, the interference processing module 34 monitors a mouse input signal, a touch input signal, and the like generated by the electronic device 100.

Next, when the input signal is generated, the interference processing module 34 determines whether the input signal is an input signal generated on the first watermark (S703), and if it is an input signal not generated on the first watermark, The operation of the electronic device 100 is processed according to the corresponding input signal without proceeding with the process.

On the other hand, if the generated input signal is an input signal generated on the first watermark, the interference processing module 34 transmits the input signal to an application located on a layer behind the first watermark, and the command according to the input signal in the application. Induce processing to prevent input interference caused when the screen overlaps with the watermark (S705).

While this specification contains many features, such features should not be construed as limiting the scope of the invention or the claims. Also, the features described in the individual embodiments herein can be implemented in combination in a single embodiment. Conversely, various features described in a single embodiment herein can be implemented individually in various embodiments or in combination as appropriate.

Although the operations are described in a particular order in the drawings, they should not be understood as being performed in a particular order as shown, or in a sequence of successive orders, or all described actions being performed to obtain a desired result. . Multitasking and parallel processing may be advantageous in certain circumstances. In addition, it should be understood that the division of various system components in the above-described embodiments does not require such division in all embodiments. The program components and systems described above may generally be packaged in a single software product or multiple software products.

The method of the present invention as described above may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

100: electronic device 110: memory
111: operating system 112: graphics module
113: watermark program 121: memory controller
122: CPU 123: peripheral interface
130: I / O subsystem 141: display device
142: input device 152: communication circuit
200: management server 300: network
31: information acquisition module 32: first watermark generation module
33: second watermark generation module 34: interference processing module

Claims (13)

delete delete One or more processors;
Display devices;
Memory; And
An electronic device comprising a program stored in the memory and configured to be executed by the one or more processors,
The program,
An information obtaining module for obtaining identification information of the electronic device and obtaining index information;
A first watermark generation module generating a first watermark including the acquired identification information and expressing the first watermark on a top layer in a predetermined region of a screen output from the display apparatus; And
Selecting a pixel area in which the second watermark is inserted in the screen being output, changing the brightness of the pixels included in the pixel area based on the bit string included in the index information, and displaying the hidden second watermark. And a second watermark generation module for recording on the screen.
The second watermark generation module,
One-to-one matching of the pixels included in the pixel area and each bit included in the bit string, and the brightness of the pixel matched by bit '1' among the matched pixels is relatively brighter than the brightness of the pixel matched by bit '0'. And change and record the second watermark on the screen. The method of claim 3,
And the index information is a bit string generated based on a MAC address of the electronic device. One or more processors;
Display devices;
Memory; And
An electronic device comprising a program stored in the memory and configured to be executed by the one or more processors,
The program,
An information obtaining module for obtaining identification information of the electronic device and obtaining index information;
A first watermark generation module generating a first watermark including the acquired identification information and expressing the first watermark on a top layer in a predetermined region of a screen output from the display apparatus; And
Selecting a pixel area in which the second watermark is inserted in the screen being output, changing the brightness of the pixels included in the pixel area based on the bit string included in the index information, and displaying the hidden second watermark. And a second watermark generation module for recording on the screen.
The second watermark generation module,
And analyzing a graphic image output on the screen, checking a color boundary, and selecting a pixel region in which the second watermark is inserted among pixels constituting the color boundary. One or more processors;
Display devices;
Memory; And
An electronic device comprising a program stored in the memory and configured to be executed by the one or more processors,
The program,
An information obtaining module for obtaining identification information of the electronic device and obtaining index information;
A first watermark generation module generating a first watermark including the acquired identification information and expressing the first watermark on a top layer in a predetermined region of a screen output from the display apparatus; And
Selecting a pixel area in which the second watermark is inserted in the screen being output, changing the brightness of the pixels included in the pixel area based on the bit string included in the index information, and displaying the hidden second watermark. And a second watermark generation module for recording on the screen.
The second watermark generation module,
Analyzing the graphic image output on the screen, to check the successive pixels having a brightness darker than the predetermined threshold brightness, and to select a pixel region to insert the second watermark from the successive pixels. Electronic device. The method according to any one of claims 3 to 6,
The program,
And an interference processing module configured to monitor whether or not an input signal is generated on the first watermark, and to transmit the input signal to an application of a lower layer. The method according to any one of claims 3 to 6,
The first watermark generation module,
And display the first watermark by opaque processing. The method according to any one of claims 3 to 6,
The first watermark generation module,
And generating and displaying a first watermark including at least one of a MAC address, an IP address, a host name, and current time information of the electronic device. A method of expressing a watermark on a screen being output from an electronic device,
Acquiring identification information of the electronic device;
Generating a first watermark including the acquired identification information;
Expressing the first watermark as a top layer in a predetermined region of the output screen;
Obtaining index information;
Selecting a pixel area in which the second watermark is inserted in the output screen; And
And changing a brightness of a pixel included in the pixel area based on the bit string included in the index information to record a second watermark in a hidden form on the screen.
The recording of the second watermark on the screen may include:
Analyzing the graphic image output on the screen, to check the successive pixels having a brightness darker than the predetermined threshold brightness, and to select a pixel region to insert the second watermark from the successive pixels. Watermark expression method. delete The method of claim 10,
After the expressing step,
Monitoring whether an input signal is generated on the first watermark; And
And transmitting the input signal to an application of a lower layer when an input signal is generated as a result of the monitoring. The method of claim 10,
The expressing step,
And generating and displaying a first watermark including at least one of a MAC address, an IP address, a host name, and current time information of the electronic device.

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