KR102328054B1 - Electronic device that provides object protection function for maintaining the original data of object embedded in electronic document and operating method thereof - Google Patents

Abstract

Disclosed are an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document, and an operating method thereof. An electronic device and an operating method thereof according to the present invention, when receiving an object protection command for a specific object among a plurality of objects inserted in an electronic document from a user, converts the object into an object image that is a captured image of the object, , by hiding the original data constituting the object in the object image by using the alpha value of each of the pixels constituting the object image, it is possible to prevent the object inserted in the electronic document from being deformed.

Description

ELECTRONIC DEVICE THAT PROVIDES OBJECT PROTECTION FUNCTION FOR MAINTAINING THE ORIGINAL DATA OF OBJECT EMBEDDED IN ELECTRONIC DOCUMENT AND OPERATING METHOD THEREOF

The present invention relates to an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document, and an operating method thereof.

Steganography refers to a technique for inserting predetermined confidential information into various types of media, such as a document file, an image file, an audio file, or a video file.

Among these steganography techniques, a technique for inserting predetermined data onto an image is mainly used.

In relation to this, in the past, in order to insert predetermined data into an image, a technique of transforming the RGB values constituting the image was used. Since it is an expressed value, there was a problem that excessive damage to the original image could be caused if the RGB values constituting the image were transformed.

On the other hand, there is an alpha value representing transparency in the image. Since this alpha value has a low correlation with the color of the image, if data can be inserted into the image using the alpha value, excessive damage to the original image is caused. It may be possible to insert data without causing

Recently, there are many cases in which important data inserted in an electronic document is arbitrarily manipulated. Steganography technology can be utilized as a way to prevent data in an electronic document from being manipulated by a person who does not have the right to edit the document. can

Specifically, data constituting the object by converting an object such as a figure, table, chart, etc. inserted in an electronic document into an object image that is a captured image of the object, and inserting data constituting the object into the object image If there is a function to protect the object by disabling the editing of the electronic document, the security of the electronic document can be strengthened.

Therefore, there is a need for research on object protection technology for maintaining original data of objects inserted in electronic documents.

An electronic device and an operating method thereof according to the present invention, when receiving an object protection command for a specific object among a plurality of objects inserted in an electronic document from a user, converts the object into an object image that is a captured image of the object, , by hiding the original data constituting the object in the object image by using the alpha value of each of the pixels constituting the object image, so that the object inserted in the electronic document cannot be modified.

An electronic device providing an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention protects a first object among a plurality of objects inserted in an electronic document from a user When a command is received, the first object is a first object image that is a capture image of the first object - The first object image is n vertically (n is a natural number greater than or equal to 2), horizontal k (k is a natural number greater than or equal to 2) Consisting of nxk pixels - an object image conversion unit that converts into A code of 1 is assigned to the first digit among 8 digits constituting the alpha value for each pixel - the alpha value is composed of a bit string having a data size of 8 bits, and is a pixel value representing the transparency of each pixel and a data inserter for inserting the original data into the first object image by allocating codes constituting partial data belonging to each data group to the remaining seven positions one by one.

In addition, according to an embodiment of the present invention, a method of operating an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention includes a first method among a plurality of objects inserted in an electronic document from a user. When the object protection command for the object is received, the first object is a first object image that is a capture image of the first object, the first object image is composed of n vertical and k horizontal nxk pixels. converting, generating a plurality of data groups by grouping the original data constituting the first object into 7-bit unit partial data, and an alpha value for each of the nxk pixels - the alpha value is 8 bits It is composed of a bit string having a data size of and inserting the original data into the first object image by allocating codes constituting the .

An electronic device and an operating method thereof according to the present invention, when receiving an object protection command for a specific object among a plurality of objects inserted in an electronic document from a user, converts the object into an object image that is a captured image of the object, , by hiding the original data constituting the object in the object image by using the alpha value of each of the pixels constituting the object image, it is possible to make the object inserted in the electronic document impossible to be deformed.

1 is a diagram illustrating a structure of an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention.
3 is a flowchart illustrating an operation method of an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. These descriptions are not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. While describing each drawing, like reference numerals are used for similar components, and unless otherwise defined, all terms used in this specification, including technical or scientific terms, refer to those of ordinary skill in the art to which the present invention belongs. It has the same meaning as is commonly understood by those who have it.

In this document, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, in various embodiments of the present invention, each of the components, functional blocks or means may be composed of one or more sub-components, and the electrical, electronic, and mechanical functions performed by each component are electronic. A circuit, an integrated circuit, an ASIC (Application Specific Integrated Circuit), etc. may be implemented with various well-known devices or mechanical elements, and may be implemented separately or two or more may be integrated into one.

On the other hand, the blocks in the accompanying block diagram or steps in the flowchart are computer program instructions that are loaded in a processor or memory of equipment capable of data processing, such as a general-purpose computer, a special-purpose computer, a portable notebook computer, and a network computer, and perform specified functions. can be interpreted as meaning Since these computer program instructions may be stored in a memory provided in a computer device or in a memory readable by a computer, the functions described in the blocks of the block diagrams or the steps of the flowcharts are produced as articles of manufacture containing instruction means for performing the same. could be In addition, each block or each step may represent a module, segment, or portion of code comprising one or more executable instructions for executing the specified logical function(s). It should also be noted that, in some alternative embodiments, it is also possible for the functions recited in blocks or steps to be executed out of the prescribed order. For example, two blocks or steps shown one after another may be performed substantially simultaneously or in the reverse order, and in some cases, some blocks or steps may be omitted.

1 is a diagram illustrating a structure of an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention.

Referring to FIG. 1 , an electronic device 110 that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention includes an object image conversion unit 111 and a data group unit. 112 and a data insertion unit 113 .

The object image conversion unit 111 is configured to convert the first object to a first object that is a captured image of the first object when an object protection command for a first object among a plurality of objects inserted in the electronic document is received from the user. Convert to image.

Here, the plurality of objects may include a figure, a table, a chart, etc., and object protection means that the object is protected as data constituting each object is maintained in a non-editable state. Also, the first object image includes n vertical (n is a natural number greater than or equal to 2) and k horizontal (k is a natural number greater than or equal to 2) n x k pixels.

For example, referring to FIG. 2 , the object image conversion unit 111 receives an object protection command for a 'chart' 211 among a plurality of objects inserted in an electronic document from a user, the 'chart' 211 . ) may be converted into a 'chart image' 210 that is a captured image for the 'chart' 211 .

The data group unit 112 creates a plurality of data groups by grouping the original data constituting the first object into partial data of 7-bit units.

For example, assuming that the 'chart' 211 is converted into a 'chart image' 210 through the object image conversion unit 111 and the original data constituting the 'chart' 211 is '11010110010100100101111101001001011000100011101', the data group The unit 112 groups '11010110010100100101111101001001011000100011101', which is the original data constituting the 'chart' 211, into 7-bit partial data to generate a plurality of data groups as shown in Table 1 below.

multiple data groups data
group 1 data
group 2 data
group 3 data
group 4 data
group 5 data
group 6 data
group 7 partial data
(7 bits) One 0 One One One 0 One One 0 0 One 0 0 One 0 One 0 One 0 0 One One 0 One 0 One One 0 0 One 0 One 0 0 One One 0 One 0 One 0 One 0 One 0 One 0

The data insertion unit 113 assigns a code of 1 to the first digit among 8 digits constituting the alpha value for each of the nxk pixels, and configures partial data belonging to each data group to the remaining 7 digits. By assigning codes one by one, the original data is inserted into the first object image.

Here, the alpha value is composed of a bit string having a data size of 8 bits, and is a pixel value indicating transparency of each pixel.

In this regard, when the first object image is set to the RGBA color mode, the pixel value of each pixel constituting the first object image is a numerical value assigned to each of the ALPHA channel, the RED channel, the GREEN channel, and the BLUE channel. may mean a set of values, and each channel has a number from 0 to 255, so that each pixel can be expressed in a different color. Specifically, the alpha value, which is the color value of the ALPHA channel, represents a transparent color as the value is closer to 0, and an opaque color as it approaches 255.

At this time, according to an embodiment of the present invention, the data insertion unit 113 includes a group number matching unit 114 , a data insertion processing unit 115 , a matrix generation unit 116 , an operation matrix generation unit 117 , and a password setting. It may include a message display unit 118 , a password recording unit 119 , and a table inserting unit 120 .

When the plurality of data groups are generated, the group number matching unit 114 provides a group number indicating a sequence number of each data group according to an arrangement order of partial data for each of the plurality of data groups. is a starting natural number), and then the group number is randomly matched to each of the nxk pixels.

The data insertion processing unit 115 assigns a code of 1 to the first digit among 8 digits constituting the alpha value for each of the nxk pixels, and based on the group number matched to each pixel in the remaining 7 digits , by allocating codes constituting partial data belonging to each data group one by one, the insertion of the original data into the first object image is completed.

Here, the data insertion processing unit 115 fixedly assigns a code of 1 to the first digit among 8 digits constituting the alpha value for each of the nxk pixels, so that the alpha value can have a pixel value of 128 or more. By setting it to be so, it is possible to process the first object image to have an opacity of a certain level or more so that it can be recognized by the eye on the electronic document.

At this time, according to an embodiment of the present invention, the data insertion processing unit 115 allocates a code of 1 to the first digit among 8 digits constituting the alpha value for each of the nxk pixels, and assigns a code of 1 to the remaining 7 digits. Based on the group number matched to each pixel, one code constituting the partial data belonging to each data group is assigned one by one, and the size of the partial data belonging to the data group corresponding to the last group number among the plurality of data groups is When it is less than 7 bits, by assigning a code of 0 to the remaining positions in which partial data is not inserted among 8 digits constituting the alpha value for the pixel matched with the last group number, the original data is added to the first object image Insertion processing can be completed.

The matrix generator 116 generates an nxk matrix having a matched group number as a component for each of the nxk pixels. In the matrix of , the component of the point corresponding to the pixel whose group number does not match is designated as 0.

In relation to this, if the first object image is composed of the nxk pixels, a bit string having a data size of nxkx 7 bits at maximum may be inserted into the first object image, and the size of the original data is {(nxk )-1} x 7 bits or less, since there will be pixels whose group numbers do not match among the nxk pixels, the matrix generator 116 sets the group in the nxk matrix to perform the next operation, the matrix operation. A component of a point corresponding to a pixel whose number does not match can be designated as 0.

When the nxk matrix is generated, the operation matrix generator 117 generates an nxk random matrix having a randomly selected natural number as a component, and then generates a Hadamard product ( Hadamard product) to generate an nxk operation matrix.

Here, the Hadamard product means an operation of multiplying each component in a matrix or vector of the same size. When there are two matrices '[abc]' and '[xyz]', A matrix can be expressed as '[ax by cz]'.

When the n x k operation matrix is generated, the password setting message display unit 118 displays a password setting message instructing the user to set a password for canceling the object protection state for the first object on the screen.

When the first password is set as a password for canceling the object protection state for the first object by the user, the password recording unit 119 creates an object image table and stores the object image table unique to the first object in the object image table. The identifier, the nxk operation matrix, the nxk random matrix, and the first password are recorded in correspondence with each other.

At this time, according to an embodiment of the present invention, after confirming the size of the original data, the password recording unit 119 further increases the size of the original data to correspond to the unique identifier for the first object in the object image table. can be recorded

Thereafter, the table inserting unit 120 inserts data constituting the object image table into the file of the electronic document.

Here, the table inserter 120 inserts the object image table into the file of the electronic document, so that when the object image table needs to be checked later in the process of extracting the original data from the first object image, It is possible to process so that the object image table can be detected from the file of the electronic document.

Hereinafter, an operation of the data insertion unit 113 will be described in detail with reference to FIG. 2 .

First, as in the above-described example, the 'chart' 211 is converted into a 'chart image' 210 by the object image conversion unit 111, and the 'chart image' 210 is '2' vertically and horizontally'. It is assumed that it is composed of 4' '2' x '4' pixels, and the original data constituting the 'chart' 211 is equal to '11010110010100100101111101001001011000100011101'.

Here, the assumption that the 'chart image' 210 is composed of '2' x '4' pixels is only an assumption presented for convenience of explanation, and the actual number of pixels of the 'chart image' 210 is higher than this. Much more.

When the plurality of data groups are generated as shown in Table 1 above, the group number matching unit 114 is configured for each data group according to the arrangement order of partial data for each of the plurality of data groups as shown in Table 2 below. Group numbers indicating a sequence number may be sequentially assigned from 1 to each other.

multiple data groups data
group 1 data
group 2 data
group 3 data
group 4 data
group 5 data
group 6 data
group 7 Partial data (7 bits) One 0 One One One 0 One One 0 0 One 0 0 One 0 One 0 One 0 0 One One 0 One 0 One One 0 0 One 0 One 0 0 One One 0 One 0 One 0 One 0 One 0 One 0 group number One 2 3 4 5 6 7

In addition, the group number matching unit 114 may randomly match the group number with respect to each of the '2' x '4' pixels constituting the 'chart image' 210 as indicated by reference numeral 220 .

Thereafter, the data insertion processing unit 115 allocates a code of 1 to the first digit among 8 digits constituting the alpha value for each of the '2' x '4' pixels, and assigns a code of 1 to the remaining 7 digits for each pixel. By allocating codes constituting partial data belonging to each data group one by one based on the group number matched to , the insertion of the original data '11010110010100100101111101001001011000100011101' in the 'chart image' 210 can be completed.

Specifically, the data insertion processing unit 115 may not insert data because the group number is not matched to the 'pixel 1' 221 among the '2' x '4' pixels, and the 'pixel 2' Since 'group number 5' is matched in 222, a code of 1 is assigned to the first digit among 8 digits constituting the alpha value for 'pixel 2' 222, and the 'group number 5' is assigned to the remaining 7 digits. Codes constituting '1001011', which is partial data belonging to 'data group 5' to which number 5' is allocated, may be allocated.

In addition, since the 'group number 2' is matched to the 'pixel 3' 223 in the data insertion processing unit 115, the first digit of the 8 digits constituting the alpha value for the 'pixel 3' 223 is 1 code of '0010100', which is partial data belonging to 'data group 2' to which 'group number 2' is assigned to the remaining 7 digits, can be assigned a code constituting '0010100' in 'pixel 4' (224) Since 'group number 4' is matched, a code of 1 is assigned to the first digit among 8 digits constituting the alpha value for 'pixel 4' (224), and 'group number 4' is assigned to the remaining 7 digits. Codes constituting '1110100', which is partial data belonging to the allocated 'data group 4', may be allocated.

In this way, the data insertion processing unit 115 also applies to 'pixel 5' 225', pixel 6' 226', pixel 7' 227 and 'pixel 8' 228 as shown in Table 3 below. As such, a code of 1 and a code constituting partial data belonging to each data group may be assigned to eight digits constituting the alpha value for each pixel. However, in the data insertion processing unit 115, the size of the partial data '11101' belonging to the data group corresponding to the last group number 'group number 7' among the plurality of data groups is 5 bits, and the unit size of the partial data is 7 Since it is smaller than a bit, by assigning a code of 0 to the remaining digits where partial data is not inserted among 8 digits constituting the alpha value for 'pixel 7' 227 matched to 'group number 7', a 'chart image Insertion of the original data '11010110010100100101111101001001011000100011101' into '210 may be completed.

pixel 1
(221) pixel 2
(222) pixel 3
(223) Pixel 4
(224) pixel 5
(225) pixel 6
(226) pixel 7
(227) pixel 8
(228) One One One One One One One One 0 One 0 One One One 0 0 One 0 One One 0 0 One One 0 0 One 0 One 0 0 One One 0 One 0 One One 0 0 One 0 One 0 0 0 One 0 One One 0 0 0 One 0 One

Thereafter, the matrix generator 116 generates a matrix 230 of '2' x '4' having a group number matched for each of the '2' x '4' pixels as a component, as shown by reference numeral 230 . However, in the case of 'pixel 1' 221, which is a pixel whose group number does not match among the '2' x '4' pixels, in the matrix 230 of '2' x '4', 'pixel 1' ( 221) may be designated as 0 to generate a matrix 230 of '2' x '4'.

When the matrix 230 of '2' x '4' is generated, the arithmetic matrix generator 117 generates a random matrix 240 of '2' x '4' such as 240 having a randomly selected natural number as a component. After generating , as in Equation 1 below, the Hadamard product of the matrix 230 of '2' x '4' with the random matrix 240 of '2' x '4' is calculated to be '2' You can create an operation matrix of x '4'.

In this way, when the operation matrix of '2' x '4' is generated, the password setting message display unit 118 is a password for instructing the user to set a password for releasing the object protection state for the 'chart' 211 . A setting message can be displayed on the screen.

In addition, when the password for releasing the object protection state for the 'chart' 211 is set to '1234' by the user, the password recorder 119 creates an object image table and then generates the object image table as shown in Table 4 below. The unique identifier for the 'chart' 211, the '2' x '4' operation matrix, the '2' x '4' random matrix 240, and the first password '1234' in the object image table They can be recorded in correspondence with each other.

In addition, after confirming the size of the original data '11010110010100100101111101001001011000100011101', the password recorder 119 checks the size of the original data '11010110010100100101111101001001011000100011101' as '47 bits'. '47 bits', which is the size of the original data, may be additionally recorded to correspond to the unique identifier for the 'chart' 211 .

unique identifier arithmetic matrix of '2' x '4' '2' x '4' random matrix password data size 'Chart' (211) identifier 1

1234 47 bits

Thereafter, the table inserting unit 120 may insert data constituting the object image table as shown in Table 4 into the file of the electronic document.

According to an embodiment of the present invention, the electronic device 110 includes a password input message display unit 121 , a password confirmation unit 122 , a matrix extraction unit 123 , a restoration matrix generation unit 124 , and a data extraction unit 125 . ) and an object restoration unit 126 may be further included.

When the password input message display unit 121 receives an object protection release command for the first object from the user after the insertion of the original data into the first object image is completed, the user can protect the object for the first object. A password input message is displayed on the screen instructing to input a password for releasing the status.

In relation to this, when the first object is converted into the first object image in the electronic document, protection processing for the first object is completed, and as the user completes editing of the electronic document, by the user After the electronic document is finally stored, when the user re-opens the electronic document through the electronic device 110 and applies an object protection release command for the first object to the electronic device 110, a password input message The display unit 121 may display the password input message instructing the user to input a password for canceling the object protection state for the first object on the screen.

When a second password is input as a password for canceling the object protection state for the first object by the user, the password confirmation unit 122 checks the data for the object image table inserted in the file of the electronic document. After loading, the first password corresponding to the unique identifier for the first object is extracted from the object image table, and it is checked whether the second password matches the first password.

When it is confirmed that the second password matches the first password, the matrix extraction unit 123 determines the nxk operation matrix and the nxk random matrix corresponding to the unique identifier for the first entity from the entity image table. to extract

The restoration matrix generator 124 generates an nxk inverse matrix by taking the reciprocal of the components of the nxk random matrix, and calculates the Hadamard product with the nxk inverse matrix for the nxk operation matrix. Create a restoration matrix.

The data extraction unit 125 identifies each of the components constituting the nxk reconstruction matrix as a group number of a data group matched to each of the nxk pixels constituting the first object image, and the nxk pixels Except for the code of 1 assigned to the first digit among the 8 digits constituting the alpha value for each pixel in By sequentially extracting based on the group number, the original data inserted into the first object image is extracted.

At this time, according to an embodiment of the present invention, the data extraction unit 125 concatenates the sequentially extracted partial data when partial data of 7-bit units are sequentially extracted from the nxk pixels based on the group number. (Concatenation) to generate concatenated data, and when it is confirmed that the size of the concatenated data is larger than the size of the original data corresponding to the unique identifier for the first entity recorded in the entity image table, the concatenated data A bit string composed of bit values corresponding to the size of the original data starting with the bit value of the first digit in the bit string constituting , may be extracted as the original data inserted into the first object image.

The object restoration unit 126 restores the first object by converting the first object image into the first object based on the original data extracted from the first object image.

In this regard, the operation of the electronic device 110 according to the above-described example will be described in detail as follows.

After the insertion of the original data '11010110010100100101111101001001011000100011101' in the 'chart image' 210 is completed, the password input message display unit 121 receives an object protection release command for the 'chart' 211 from the user. A password input message instructing to input a password for canceling the object protection state for the 'chart' 211 may be displayed on the screen.

At this time, when the second password is input as a password for canceling the object protection state for the 'chart' 211 by the user, the password confirmation unit 122 displays Table 4 and Table 4 inserted in the file of the electronic document. After loading data for the same object image table, and extracting the first password '1234' corresponding to the unique identifier for the 'chart' 211 from the object image table as in Table 4, the second password It may be checked whether '1234', which is the first password, matches.

At this time, if it is confirmed that the second password matches the first password '1234', the matrix extraction unit 123 is a unique identifier for the 'chart' 211 from the object image table as in Table 4 above. The corresponding operation matrix of '2' x '4' and the random matrix 240 of '2' x '4' may be extracted.

The reconstruction matrix generator 124 may generate the reciprocal matrix 250 of '2' x '4', such as 250, by taking the inverse of the components of the random matrix 240 of '2' x '4'. And, by calculating the Hadamard product with the inverse matrix 250 of '2' x '4' for the operation matrix of '2' x '4' as shown in Equation 2 below, '2' x '4' We can create a restoration matrix of

Then, the data extraction unit 125 applies each of the components other than 0 among the components constituting the '2' x '4' reconstruction matrix to the '2' x '4 constituting the 'chart image' 210 . It can be identified by the group number of the data group matched to each of the 'pixels, and in the '2' x '4' pixels, 1 assigned to the first digit among 8 digits constituting the alpha value for each pixel '1101011', '0010100', '1001011', '1110100', '1101011', '0010100', '1001011', '1110100', '1101011', '0010100', '1001011', It can be sequentially extracted, such as '1001011', '0001000', and '1110100'.

In this way, when partial data of 7-bit units are sequentially extracted from the '2' x '4' pixels based on the group number, the data extraction unit 125 is sequentially extracted partial data '1101011', By concatenating '0010100', '1001011', '1110100', '1001011', '0001000', and '1110100', concatenated data '1101011001010010010111110100100101100010001110100' may be generated.

At this time, the size of the concatenated data is '49 bits', which is greater than '47 bits', which is the size of the original data corresponding to the unique identifier for the 'chart' 211 recorded in the object image table as in Table 4 above. If it is confirmed that it is large, the data extraction unit 125 starts with '1', which is the bit value of the first digit in the bit string constituting the concatenated data '1101011001010010010111110100100101100010001110100', and consists of bit values corresponding to as many as '47 bits'. The bit string '11010110010100100101111101001001011000100011101', which is a bit string, may be finally extracted as the original data inserted into the 'chart image' 210 .

Then, the object restoration unit 126 converts the 'chart image' 210 into a 'chart' 211 based on '11010110010100100101111101001001011000100011101', which is the original data extracted from the 'chart image' 210 , and thereby, the 'chart' (211) can be restored.

That is, as the object restoration unit 126 receives an object protection release command for the 'chart' 211 from the user, the 'chart image' 210 in a state in which editing of the original data is not possible is converted into a 'chart' ( 211), it is possible to support the user to freely edit the original data constituting the 'chart' 211 .

3 is a flowchart illustrating an operation method of an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention.

In step S310, when an object protection command for a first object among a plurality of objects inserted in the electronic document is received from the user, the first object is set to a first object image (the first object image as a captured image of the first object). The first object image is converted into n vertical and k horizontal nxk pixels).

In step S320, a plurality of data groups are created by grouping the original data constituting the first object into 7-bit partial data.

In step S330, the first of 8 digits constituting the alpha value for each of the nxk pixels (the alpha value is composed of a bit string having a data size of 8 bits and is a pixel value indicating the transparency of each pixel) The original data is inserted into the first object image by assigning a code of 1 to the first digit and assigning one code constituting partial data belonging to each data group to the remaining seven digit.

At this time, according to an embodiment of the present invention, when the plurality of data groups are generated in step S330 , for each of the plurality of data groups, the sequence number of each data group according to the arrangement order of the partial data is indicated. After sequentially allocating a group number, randomly matching the group number to each of the nxk pixels, 1 in the first digit among 8 digits constituting the alpha value for each of the nxk pixels Insertion of the original data into the first object image is performed by allocating a code and assigning one code constituting partial data belonging to each data group to the remaining seven positions based on the group number matched to each pixel. Completing the process, generating an nxk matrix having a matched group number as a component for each of the nxk pixels, and if there is a pixel whose group number does not match among the nxk pixels, the nxk matrix designating as 0 a component of a point corresponding to a pixel whose group number does not match in , when the nxk matrix is generated, an nxk random matrix having a randomly selected natural number as a component is generated, and then the nxk matrix generating an nxk operation matrix by calculating the Hadamard product with the nxk random matrix for Displaying a password setting message instructing to set on the screen, when the first password is set as a password for canceling the object protection state for the first object by the user, an object image table is created to create the object image Recording the unique identifier for the first entity, the nxk operation matrix, the nxk random matrix, and the first password in correspondence with each other in a table, and data constituting the entity image table in the file of the electronic document insert may include steps.

Also, according to an embodiment of the present invention, in the method of operating the electronic device, when an object protection release command for the first object is received from the user after the insertion of the original data into the first object image is completed, Displaying a password input message on a screen instructing the user to input a password for canceling the object protection state for the first object, for canceling the object protection state for the first object by the user When a second password is input as a password, data for the object image table inserted in the file of the electronic document is loaded, and the first password corresponding to a unique identifier for the first object in the object image table After extraction, checking whether the second password matches the first password, if it is confirmed that the second password matches the first password, a extracting the nxk operation matrix and the nxk random matrix, generating an nxk reciprocal matrix by taking the reciprocal of the components of the nxk random matrix, generating an nxk restoration matrix by calculating the Hadamard product; each of the components constituting the nxk restoration matrix as a group number of a data group matched to each of the nxk pixels constituting the first object image Check and configure partial data in 7-bit units allocated to the remaining 7 digits, except for the code of 1 allocated to the first digit among the 8 digits constituting the alpha value for each pixel in the nxk pixels extracting the original data inserted into the first object image by sequentially extracting a code to be executed based on the group number identified in each pixel, and the second object based on the original data extracted from the first object image 1 Select the object image The method may further include restoring the first object by converting it into the first object.

At this time, according to an embodiment of the present invention, the step of completing the processing of the insertion of the original data allocates a code of 1 to the first digit among 8 digits constituting the alpha value for each of the nxk pixels, , one code constituting partial data belonging to each data group is assigned to the remaining 7 digits based on the group number matched to each pixel, but belonging to the data group corresponding to the last group number among the plurality of data groups When the size of the partial data is smaller than 7 bits, by allocating a code of 0 to the remaining positions where the partial data is not inserted among 8 digits constituting the alpha value for the pixel matched with the last group number, a code of 0 is assigned to the first object The process of inserting the original data into the image may be completed.

In addition, according to an embodiment of the present invention, in the step of recording the first password in correspondence with each other, after confirming the size of the original data, the original data to correspond to the unique identifier for the first object in the object image table The size of the data can be additionally recorded.

At this time, according to an embodiment of the present invention, in the step of extracting the original data, when the partial data in units of 7 bits from the nxk pixels are sequentially extracted based on the group number, the sequentially extracted partial data concatenated to generate concatenated data, and when it is confirmed that the size of the concatenated data is larger than the size of the original data corresponding to the unique identifier for the first entity recorded in the object image table, the concatenated data A bit string composed of bit values corresponding to the size of the original data starting from the bit value of the first digit in the bit string constituting the component may be extracted as the original data inserted into the first object image.

The operating method of an electronic device providing an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention has been described with reference to FIG. 3 . Here, the operating method of the electronic device that provides the object protection function for maintaining the original data of the object inserted in the electronic document according to an embodiment of the present invention is inserted into the electronic document described with reference to FIGS. 1 and 2 . Since it may correspond to the configuration of the operation of the electronic device 110 that provides the object protection function for maintaining the original data of the object, a more detailed description thereof will be omitted.

An operating method of an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention is implemented as a computer program stored in a storage medium for execution through combination with a computer can be

In addition, the operating method of an electronic device that provides an object protection function for maintaining original data of an object inserted in an electronic document according to an embodiment of the present invention is implemented in the form of a computer program command for execution through combination with a computer and may be recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

As described above, the present invention has been described with specific matters such as specific components and limited embodiments and drawings, but these are provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , various modifications and variations are possible from these descriptions by those of ordinary skill in the art to which the present invention pertains.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

110: An electronic device that provides an object protection function for maintaining the original data of an object inserted in an electronic document
111: object image conversion unit 112: data group unit
113: data insertion unit 114: group number matching unit
115: data insertion processing unit 116: matrix generation unit
117: operation matrix generation unit 118: password setting message display unit
119: password log 120: table insert
121: password input message display unit 122: password confirmation unit
123: matrix extraction unit 124: restoration matrix generation unit
125: data extraction unit 126: object restoration unit

Claims (12)

When an object protection command for a first object among a plurality of objects inserted in an electronic document is received from a user, the first object is a first object image that is a capture image of the first object - The first object image is an object image converter that converts n x k pixels vertically (where n is a natural number greater than or equal to 2) and horizontally k (where k is a natural number greater than or equal to 2);
a data group unit generating a plurality of data groups by grouping the original data constituting the first object into 7-bit partial data;
When the plurality of data groups are generated, for each of the plurality of data groups, a group number (the group number is a natural number starting from 1) indicating a sequence number of each data group according to the arrangement order of the partial data is sequentially After allocating, a group number matching unit that randomly selects first pixels corresponding to the number of the plurality of data groups from among the nxk pixels, and randomly matches the group number to each of the first pixels ;
The alpha value for each of the first pixels - the alpha value is composed of a bit string having a data size of 8 bits, and is a pixel value representing the transparency of each pixel - 1 in the first digit Insertion of the original data into the first object image is performed by allocating a code and assigning one code constituting partial data belonging to each data group to the remaining seven positions based on the group number matched to each pixel. a data insertion processing unit that completes the processing;
Among the nxk pixels, a component of a point corresponding to the first pixels is designated as a group number matched to each pixel, and all components of a point corresponding to the remaining pixels except for the first pixels are designated as 0. , a matrix generator for generating an nxk matrix;
When the nxk matrix is generated, an nxk random matrix having a randomly selected natural number as a component is generated, and then a Hadamard product is calculated on the nxk matrix with the nxk random matrix to obtain an nxk an arithmetic matrix generating unit generating an arithmetic matrix;
a password setting message display unit for displaying on a screen a password setting message instructing the user to set a password for canceling the object protection state for the first object when the nxk operation matrix is generated;
When a first password is set as a password for canceling the object protection state for the first object by the user, an object image table is created and a unique identifier for the first object is calculated in the object image table, nxk a password recorder for recording a matrix, the nxk random matrix, and the first password in correspondence with each other; and
A table inserting unit for inserting data constituting the object image table into the file of the electronic document
An electronic device that provides object protection for maintaining the original data of an object embedded in an electronic document containing delete According to claim 1,
When an object protection release command for the first object is received from the user after the insertion of the original data into the first object image is completed, a password for canceling the object protection state for the first object is input to the user a password input message display unit for displaying a password input message instructing to do so on the screen;
When a second password is input by the user as a password for canceling the object protection state for the first object, data for the object image table inserted in the file of the electronic document is loaded, and the object image table a password check unit for extracting the first password corresponding to the unique identifier for the first object from the and confirming whether the second password matches the first password;
a matrix extraction unit for extracting the nxk operation matrix and the nxk random matrix corresponding to the unique identifier for the first object from the object image table when it is confirmed that the second password matches the first password;
A reconstruction matrix generating an n-by-k reconstruction matrix by taking the inverse of the components of the n-by-k random matrix to generate an n-by-k reciprocal matrix, and calculating the Hadamard product with the n-by-k inverse matrix on the n-by-k operation matrix wealth;
Among the nxk pixels constituting the first object image, pixels corresponding to points where non-zero components are located in the components constituting the nxk restoration matrix are selected as the first pixels, and the nxk pixels are selected as the first pixels. After identifying each non-zero component in the components constituting the restoration matrix of , as a group number of a data group matched to each of the first pixels, the first pixels constitute an alpha value for each pixel By sequentially extracting the codes constituting the 7-bit unit of partial data allocated to the remaining 7 digits, based on the group number identified in each pixel, except for the code of 1 allocated to the first digit among the 8 digits. , a data extraction unit for extracting the original data inserted into the first object image; and
An object restoration unit that restores the first object by converting the first object image into the first object based on the original data extracted from the first object image
An electronic device that provides object protection for maintaining the original data of an object embedded in an electronic document further comprising: 4. The method of claim 3,
The data insertion processing unit
A code of 1 is assigned to the first digit among eight digits constituting the alpha value for each of the first pixels, and a part belonging to each data group based on the group number matched to each pixel in the remaining seven positions Allocate codes constituting data one by one, and when the size of partial data belonging to the data group corresponding to the last group number among the plurality of data groups is less than 7 bits, the alpha value for the pixel matched with the last group number An object inserted in an electronic document, characterized in that by assigning a code of 0 to the remaining positions where partial data is not inserted among 8 digits constituting the , the insertion of the original data into the first object image is completed. An electronic device that provides object protection to preserve the original data of 5. The method of claim 4,
The password record
After confirming the size of the original data, additionally recording the size of the original data to correspond to the unique identifier for the first object in the object image table,
The data extraction unit
When partial data of 7-bit units are sequentially extracted from the first pixels based on the group number, the sequentially extracted partial data is concatenated to generate concatenated data, and the size of the concatenated data is When it is confirmed that the size of the original data corresponding to the unique identifier for the first object recorded in the object image table is larger than the size of the original data, starting with the bit value of the first digit in the bit string constituting the concatenated data, the An object protection function for maintaining the original data of an object inserted in an electronic document, characterized in that a bit string composed of bit values corresponding to the size of the original data is extracted as the original data inserted into the first object image electronic devices that provide When an object protection command for a first object among a plurality of objects inserted in an electronic document is received from a user, the first object is a first object image that is a capture image of the first object - The first object image is converting to n x k pixels vertically (n is a natural number greater than or equal to 2) and horizontally k (where k is a natural number greater than or equal to 2);
generating a plurality of data groups by grouping the original data constituting the first object into 7-bit partial data;
When the plurality of data groups are generated, for each of the plurality of data groups, a group number (the group number is a natural number starting from 1) indicating a sequence number of each data group according to the arrangement order of the partial data is sequentially after allocating, randomly selecting first pixels corresponding to the number of the plurality of data groups from among the nxk pixels, and randomly matching the group number to each of the first pixels;
The alpha value for each of the first pixels - the alpha value is composed of a bit string having a data size of 8 bits, and is a pixel value representing the transparency of each pixel - 1 in the first digit Insertion of the original data into the first object image is performed by allocating a code and assigning one code constituting partial data belonging to each data group to the remaining seven positions based on the group number matched to each pixel. processing completion;
Among the nxk pixels, a component of a point corresponding to the first pixels is designated as a group number matched to each pixel, and all components of a point corresponding to the remaining pixels except for the first pixels are designated as 0. , generating a matrix of nxk;
When the nxk matrix is generated, an nxk random matrix having a randomly selected natural number as a component is generated, and then a Hadamard product is calculated on the nxk matrix with the nxk random matrix to obtain an nxk generating an operation matrix;
when the nxk operation matrix is generated, displaying a password setting message instructing the user to set a password for canceling the object protection state for the first object on a screen;
When a first password is set as a password for canceling the object protection state for the first object by the user, an object image table is created and a unique identifier for the first object is calculated in the object image table, nxk recording a matrix, the nxk random matrix, and the first password in correspondence with each other; and
Inserting data constituting the object image table into a file of the electronic document
An operating method of an electronic device that provides an object protection function for maintaining the original data of an object inserted in an electronic document containing a. delete 7. The method of claim 6,
When an object protection release command for the first object is received from the user after the insertion of the original data into the first object image is completed, a password for canceling the object protection state for the first object is input to the user displaying a password input message instructing to do so;
When a second password is input by the user as a password for canceling the object protection state for the first object, data for the object image table inserted in the file of the electronic document is loaded, and the object image table extracting the first password corresponding to the unique identifier for the first entity and checking whether the second password matches the first password;
when it is confirmed that the second password matches the first password, extracting the nxk operation matrix and the nxk random matrix corresponding to the unique identifier for the first entity from the entity image table;
generating an nxk reciprocal matrix by taking the inverse of the components of the nxk random matrix, and calculating a Hadamard product with the nxk inverse matrix on the nxk operation matrix to generate an nxk restoration matrix;
Among the nxk pixels constituting the first object image, pixels corresponding to points where non-zero components are located in the components constituting the nxk reconstruction matrix are selected as the first pixels, and the nxk pixels are selected as the first pixels. After identifying each non-zero component in the components constituting the restoration matrix of , as a group number of a data group matched to each of the first pixels, the first pixels constitute an alpha value for each pixel By sequentially extracting the codes constituting the 7-bit unit of partial data allocated to the remaining 7 digits, based on the group number identified in each pixel, except for the code of 1 allocated to the first digit among the 8 digits. , extracting the original data inserted into the first object image; and
restoring the first object by converting the first object image into the first object based on the original data extracted from the first object image
An operating method of an electronic device that provides an object protection function for maintaining the original data of the object inserted in the electronic document further comprising a. 9. The method of claim 8,
The step of completing the processing of inserting the original data is
A code of 1 is assigned to the first digit among eight digits constituting the alpha value for each of the first pixels, and a part belonging to each data group based on the group number matched to each pixel in the remaining seven positions Allocate codes constituting data one by one, and when the size of partial data belonging to the data group corresponding to the last group number among the plurality of data groups is less than 7 bits, the alpha value for the pixel matched with the last group number An object inserted in an electronic document, characterized in that by assigning a code of 0 to the remaining positions where partial data is not inserted among 8 digits constituting the , the insertion of the original data into the first object image is completed. A method of operation of an electronic device that provides object protection for preserving the original data of 10. The method of claim 9,
The step of recording the first password in correspondence with each other is
After confirming the size of the original data, additionally recording the size of the original data to correspond to the unique identifier for the first object in the object image table,
The step of extracting the original data is
When partial data of 7-bit units are sequentially extracted from the first pixels based on the group number, the sequentially extracted partial data is concatenated to generate concatenated data, and the size of the concatenated data is When it is confirmed that the size of the original data corresponding to the unique identifier for the first object recorded in the object image table is larger than the size of the original data, starting with the bit value of the first digit in the bit string constituting the concatenated data, the An object protection function for maintaining the original data of an object inserted in an electronic document, characterized in that a bit string composed of bit values corresponding to the size of the original data is extracted as the original data inserted into the first object image An operating method of an electronic device that provides A computer-readable recording medium recording a computer program for executing the method of any one of claims 6, 8, 9 or 10 through combination with a computer. A computer program stored in a storage medium for executing the method of any one of claims 6, 8, 9 or 10 in combination with a computer.

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