KR101520058B1 - Digital right protection method of the video stream using modulating frequency domain - Google Patents

Abstract

The present invention relates to a method for protecting rights through unique recording in a digital image and, more specifically, to a method for protecting digital rights of a video stream using frequency modulation. One of video stream frames is randomly selected, and the lowest one of frequency regions of the selected frame is removed. The region spaced at a particular distance having a size as much as a number at the first digit of an ID to be applied from the deleted region, and a region having the lowest frequency from a frame next to the frame in which the first digit of the ID is recorded is removed. A region in which a number at the next digit of the ID is spaced at a particular distance having a size of the number sequentially digit by digit is removed, thereby recording a unique ID. Moreover, the method for protecting digital rights of a video stream using frequency modulation according to the present invention comprises: a frame appointing step of selecting one of a plurality of frames constituting a video stream and appointing the same as an nth frame; a frequency converting step of converting the nth frame to a frequency region; a deleting step of removing the lowest frequency region from the end of a frequency region of the converted nth frame; and an ID applying step of removing a region spaced at a particular distance having a size as much as a number disposed in the first digit (k) of an ID to be applied from the deleted region.

Description

TECHNICAL FIELD [0001] The present invention relates to a digital rights protection method for a video stream using frequency modulation,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for protecting the rights of digital contents using frequency modulation and more particularly to a digital rights protection ≪ / RTI >

The method of recording and storing image images has been converted from analog to digital form according to the development of technology and is widely used.

Digital image information is easy and convenient to store, copy, convert, manage, and distribute. However, there have been serious problems that it is difficult to protect the intellectual property rights of digital image information due to frequent duplication and sharing.

In order to solve such infringement of intellectual property rights, a security device for protecting digital image information has been developed. Digital rights management (Digital rights), which can protect various digital information such as voice information as well as digital image information, management, DRM).

Digital rights management is a method of encrypting and transmitting transmitted data and restoring encrypted data by inputting a secret key by a receiver so that even if a third party illegally receives data during transmission, it can not restore it to original data.

 In particular, it means technology that allows the authorized user to use the content within the permitted range by using the encryption technology. However, as the distribution of digital contents becomes active, the digital contents are created, distributed and used To protect and manage digital content over time.

However, since digital rights management can disclose data similar to the original extracted by the legitimate recipients to a third party, there is a problem in that it is impossible to protect the copyright of the data itself or to know from whom the original data is leaked there was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital rights protection method of a video stream using frequency modulation capable of recording a unique ID in each frame of a digital image.

It is another object of the present invention to provide a digital rights protection method for a video stream using frequency modulation that can minimize damage to digital image information.

According to an aspect of the present invention, there is provided a digital rights protection method for a video stream using frequency modulation, comprising: a frame designation step (S1) of designating a frame to be given an ID of a plurality of frames constituting a video stream; (S2) for converting the designated frame into a frequency domain, a step (S3) for deleting a certain portion in a specific region of the converted frequency domain, a step And an ID giving step (S4) of erasing the ID area separated from the part.

If the ID has K number of (k is a natural number equal to or greater than 2), an ID of the most significant position value is assigned to the first frame of the arbitrary frames, and an ID of each sequential place value is sequentially assigned And a recording step (5) of giving an ID of the lowest position value to the Kth frame.

In addition, the ID of the ID giving step S4 is an author specific code.

Further, the ID of the ID assigning step S4 is recorded in the first frame of the video stream.

Further, it is characterized in that any frame of the frame designation step (S1) is selected and designated randomly.

In addition, the randomly designated frame is a frame selected within the frame per second of the video stream from the first frame.

Further, an arbitrary frame selected and designated in the frame designation step S1 is a first frame of a video stream (moving picture).

The specific region is an end region of the frequency region.

In addition, the specific region is an area spaced apart by a distance corresponding to a number determined by the chaos function at one end of the frequency domain.

As described above, according to the digital rights protection method for a video stream using frequency modulation according to the present invention, it is possible to record a unique ID in each frame of a digital image while maintaining security.

In addition, according to the digital rights protection method for a video stream using frequency modulation according to the present invention, digital rights can be protected while minimizing damage to image information.

1 is a flowchart of a digital rights protection method for a video stream using frequency modulation according to the present invention;
2 is a diagram illustrating a frame designation step and a frequency transformation step of a digital rights protection method of a video stream using frequency modulation according to the present invention.
3 illustrates a step of deleting a digital rights protection method for a video stream using frequency modulation according to the present invention.
4 is a diagram showing an ID assigning step of a digital rights protection method of a video stream using frequency modulation according to the present invention.
5 shows a recording step of a digital rights protection method of a video stream using frequency modulation according to the present invention.
6 is a diagram illustrating a method of recording an ID of a digital rights protection method for a video stream using frequency modulation according to the present invention.
7 is a diagram illustrating an erasure area and an identification area of a digital rights protection method of a video stream using frequency modulation according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a flowchart of a digital rights protection method of a video stream using frequency modulation according to the present invention. FIG. 2 is a flowchart illustrating a frame designation step and a frequency transformation step of a digital rights protection method of a video stream using frequency modulation according to the present invention. FIG. 3 is a diagram illustrating a step of deleting a digital rights protection method for a video stream using frequency modulation according to the present invention. FIG. 4 is a flowchart illustrating a digital rights protection method for a video stream using frequency modulation according to the present invention. FIG. 5 is a diagram illustrating a recording step of a digital rights protection method of a video stream using frequency modulation according to the present invention, and FIG. 6 is a flowchart illustrating a method of recording a digital stream of a video stream using frequency modulation according to the present invention. FIG. 7 is a diagram illustrating a method of recording an ID of a digital rights protection method, Time is it a frequency-modulated according to a diagram showing the deletion region and ID region of a method of digital rights protection of a video stream using.

FIG. 1 shows a step-by-step procedure of a digital rights protection method for a video stream using frequency modulation according to the present invention, and includes a frame designation step S1, a frequency conversion step S2, a deletion step S3, S4, and a recording step S5.

More specifically, the frame designation step S1 is a step of selecting a specific frame among a plurality of frames constituting the video stream, and the frequency conversion step S2 is a step of designating the frame selected in the frame designation step S1 as a frequency domain (S3) is a step of deleting a certain portion in a specific region of the converted frequency domain, and the step of assigning an identity (S4) is a step of deleting a predetermined portion of the frequency domain by a separation distance corresponding to a predetermined position value And the recording step S5 is a step of setting the area separated from the designated ID area to the ID of the designated area from the ID of the first digit to the ID of the last digit when the ID is the multiple digit value, .

2 shows a frame designation step (S1) of a digital rights protection method of a video stream using frequency modulation according to the present invention, and II shows a digital rights protection method of a video stream using frequency modulation according to the present invention. Frequency conversion step (S2).

As shown in I, the frame designation step S1 is to select (specify) a specific frame (selected frame 20) from the entire frame 10 of the video stream, A frame at a specific location, such as a frame or a second frame, may be selected, a frame at a random location may be selected, or it may be repeatedly selected in accordance with the frame per second of the video stream.

More specifically, the frame of the random position may be selected from any one of the video stream full frames 10, or from the first frame to the frames within the frames per second of the video stream. For example, if the video stream is 150 frames and the frame per second is 30 frames, only one 121 frames may be selected, and 14 frames, one within 30 frames per second, may be selected,

For example, if the number of frames per second of the video stream is 30 frames, one of the frames located between the first frame and the 30th frame is selected. That is, if the frame rate per second of the video stream is 30 frames, it may be repeatedly selected for every 15th frame, which is a specific position, and may be selected and designated by 15 frames, 45 (15 + 30) frames, 75 (15 + 30 + 30) will be.

In addition, the first frame may be changed to a specific frame, for example, the third frame of the image, and the number of frames per second may be changed to 25 frames, 33 frames, or the like by the author.

As a preferred embodiment, it is preferable to select one of the first frame to the 30th frame as a method of selecting a specific frame in the frame designation step S1.

As shown in FIG. 2, the frequency transformation step S2 transforms the frame 20 selected in the frame designation step S1 into a frequency domain. In the frequency transformation step S2, Fourier transform is performed in the form of a graph for analysis.

When the frame selected by the frequency domain graph 30 is transformed through the Fourier transform as described above, one end of the frequency domain is designated as a reference region 40 in order to minimize a specific portion of the graph, typically image damage.

As a preferred embodiment, the reference area 40 located at the end of the graph is preferably located at the right end of the graph, but may be located at the left end of the graph.

FIG. 3 is a diagram illustrating a deletion step (S3) of a digital rights protection method of a video stream using frequency modulation according to the present invention. In the reference region 40 set through the frequency transformation step S2, The frequency domain is deleted.

For example, as shown in I, an area located at the right end of the frequency domain graph 30 belonging to the reference domain 40 is searched for and the deletion domain 50 is designated and deleted.

The width of the deletion area 50 may be determined by the author, but a width of 1 is preferable when the range of the x-axis of the frequency domain is 0 to 100 in order to give an ID composed of numbers.

Also, when the x-axis range of the frequency domain is divided by 0 to 100, it is also convenient to calculate the separation distance corresponding to the place value of the ID.

As a preferred embodiment, it is preferable that the area to be deleted has a predetermined vertical axis height as well as a predetermined horizontal axis width as described above in view of the case where the graph is discrete or linear, Is perpendicular to the horizontal axis.

FIG. 4 is a diagram showing an ID assigning step (S4) of a digital rights protection method of a video stream using frequency modulation according to the present invention. As shown in FIG. 4, , I.e., an area separated by a separation distance corresponding to a predetermined value of an ID to be given at the end of the frequency domain graph 30 whose end is deleted, as an ID area, and deleting the designated ID area as II.

Therefore, the width of the ID area coincides with the width of the delete area.

If the ID to be granted is one digit value, for example, ID = 3, there may be only one frame to which an ID is assigned.

However, in the case where IDA to be granted is a two-digit value, for example, ID = 35, there may be one frame to which an ID is assigned, and a frame to which an ID is assigned to give an ID corresponding to a spot value It could be two.

If a two-digit value is assigned to one frame, the deletion area has a width of 1 when the range of the x-axis of the frequency-frequency domain is 0 to 100, If the separation distance is 35 and the width of 1 is deleted in the ID area separated by 35 from the deletion area, the ID is given to one frame.

If the two-digit value of the two frames is to be assigned, an ID of 3 may be assigned to one frame, and an ID of 5 may be assigned to the next designated frame. It is preferable that the separation distance is 3 or 5.

In the case where the ID to be assigned is an ID of three digits, for example, ID = 145, if a three-digit value is assigned to one frame, if the range of the x-axis of the frequency domain is 0 to 100, The ID is assigned to one frame when the ID of the ID to be assigned is set to 14.5 and the ID of the ID to be assigned is 14.5, If an ID of two-digit value of one frame is given, ID of 1 is assigned to one frame, ID of 4 is assigned to the next designated frame, ID of 5 is assigned to the next designated frame, The distance is preferably 1, 4 or 5.

If the ID of the ID to be assigned is 4 digits, the entire ID may be assigned to one frame. Alternatively, the ID may be assigned to two frames divided by 2 digits, It might be.

However, if an entire ID is assigned to one frame, it is most preferable to assign only one number to one frame since a third party can find the ID by inverse calculation.

If the ID has multiple values (for example, a digit), the first digit from the left of the ID number is represented by k, the second digit by 2k, the third digit by 3k, and the last digit by ak .

As a preferred embodiment, the outer portion of the ID region to be deleted preferably has a predetermined horizontal axis width in consideration of when the graph is linear, and the end of the graph tangent to the ID region 70 after the erasure is perpendicular to the horizontal axis .

Therefore, in FIG. 4, empty spaces are formed at both ends of the graph having a predetermined width by the number size 60 of the first digit of the ID.

For example, when the first digit of the ID to be recorded is 7, and the size of the horizontal axis shown in I is 1, the distance from the deletion area 50 to the ID area 70 is 7, As a result, the outer edge of the ID area 70 is deleted as shown in FIG. 6B, and the graph has a predetermined width corresponding to the numeric size 60 of the first digit.

FIG. 5 illustrates a recording step S5 of a digital rights protection method for a video stream using frequency modulation according to the present invention, where I represents the ID recording step S5 at the first frame n assigned with ID And the second digit (2k) of the ID is recorded in the second frame (n + B).

Here, B means a natural number of 1 or more, and thus the second frame may be the next frame or a frame that is separated from the previous frame by the value B

For example, if B is 3, '1 frame, 4 frame, 7 frame ...' is selected and recorded.

7 (1k) is recorded in the first frame (n), 4 (2k) is recorded in the second frame (n + B) 6 (3k) is recorded in the fourth frame (n + 2B), 9 (4k) is recorded in the fourth frame n + 3B and 2 (5k) is recorded in the fifth frame n + 4B.

As described above, the ID is recorded by one digit in the frame of the number of digits of the ID.

Also, the recording process may be repeated by recording the last digit and then recording the first digit again in a predetermined period.

For example, if it is repeated with the ID '74692', the IDs recorded in each frame from the first frame are '7, 4, 6, 9, 2, 7, 4, 6, 9, 6, 9, 2 ... '.

As a preferred embodiment, it is preferable that the ID is repeated and recorded as described above. However, the ID may be recorded once per second of the video stream from the first frame, and the ID (n) + (gamma)) th (unspecified) frame.

For example, with an ID of '74692', if the number of frames per second of the video stream is 30 frames and the ID is recorded once per second of the video stream from the first frame, Only the fifth frame from the frame may be recorded, and it may be recorded again from the 31st frame to the fifth frame.

When the recording of the ID is repeated, the frames are recorded in the 31st, 33rd, 35th, 37th, and 39th frames using the number of frames per second and the B value, and 61nd, 63rd, 65th, and 67th Th frame, and the 69th frame, and recording may be repeated from the 91st frame.

More specifically, the frame to be continuously recorded depends on the number of digits of the ID, and the position of the frame in which the first digit of the ID is recorded has the order of 'n, n + 1β n + 2β, n + 3β ...' The value beta is the number of frames per second of the video stream.

For example, when the ID is' 243 'and the number of frames per second of the video stream is 5, the number of digits of the ID is 3. Basically, the frame to be recorded is 3 frames, and the ID recorded in the video is' 2, , X, X, 2, 4, 3, X, X, 2, 4, 3 ... (X means no ID is given), and the number of digits The frame is not recorded.

As described above, one frame of the ID is recorded in one frame according to the frame order from the first frame (n).

In addition, since k used in the present description means the first digit value, the ID used is two or more digits, and when repeated by a number of digits, 2k, which means the second digit, may be expressed as k + 1, May be used as 3k or k + 2.

For example, it is changed to the value of 'k, k + 1, k + 2, k + 3', and the 'first digit, next digit after first digit, next digit after first digit, The first digit, the second digit, the third digit, and the fourth digit 'of the next digit of the next digit.

Therefore, k used from the second digit means the previous digit, and the representation of the digit position by repetition is only for explanation and there is no special meaning.

FIG. 6 is a diagram illustrating a recording method of recording an ID of a digital rights protection method of a video stream using frequency modulation according to the present invention in a moving picture, and an ID recorded in a frame is recorded in a frame.

The frequency domain 30 in which the image is converted into one of the frames of the video stream and the ID notice area 80 in which the ID (all digits of the ID) are recorded or the ID frame The frame may be configured to include only the ID notification area 80 in which there is no frequency domain and only the ID is recorded.

The recording of the ID (all digits of the ID) is not necessarily recorded as one embodiment, and there is no particular restriction on its position, but it is preferable that the ID is recorded in the first frame of the video stream.

As in III, all the digits of the ID and its size are recorded in the ID announcement area 80, and it can also be used as an application for verifying an ID recorded in the other frame by using one digit.

For example, as shown in the graph, the ID 1k of the first digit is 7, the ID 2k of the second digit is 4, the ID 3k of the third digit is 6, (4k) is 6, and the ID 5k of the fifth digit is 2.

As described above, the ID (all digits of the ID) may be recorded one digit of the ID from the next frame of the recorded frame, or may be recorded from the frame of the selected specific position.

7 is a diagram illustrating an erasure area and an ID area of a digital rights protection method of a video stream using frequency modulation according to a second embodiment of the present invention.

In the above description, the method of setting the right end of the frequency domain as the reference domain has been described. However, it is preferable that the reference domain be set in different positions for each frame for security.

In the present invention, the setting of the reference area is configured using a chaos function, and the position of the reference area can be set differently for each frame by using the chaos function.

A chaotic function means that an unpredictable tremendous change occurs even with very small initial conditions. For example, you can do mathematical modeling with the following function.

     f (x) = (fractional part of 10x)

     For example, let's start with the following numbers:

         0.14285712989234609814

     Multiply 10 to eliminate the integer part.

         0.4285712989234609814

     Repeat this process once more

         0.285712989234609814, and such a process can be continued.

   In this case, there is a small difference in the first number, that is, 0.0000000000000000001%

         0.14285712989234609814

If the function is applied 20 times, the difference is 0.4: 0.5 or 20%.

   The following are examples of other functions.

   f (x) = kx (1-x) (where k is a constant)

   For example, if k = 2.1 and the first value is 0.5, apply the function several times to get 0.523809524. No matter what the first number actually is, if k = 2.1, it converges very quickly to the number above. This k is called an 'attractor', reminiscent of falling down a hill. Now, if you change k to 2.5 or 2.8, you converge to the single number of 0.6 or 0.6428.

However, if k = 3.1, it will show a pattern of back and forth between 0.55801412 and 0.76456652 like a clock. If k is bigger like 3.7, it looks like it is riddled with an unknown pattern. This is chaos. If the function is applied 50 times and the first value is 0.5, 0.921072984 is displayed. However, if the first value is 0.50001 and the function is applied 50 times, the result is 0.5655490980, which is completely different.

With such a chaotic function, the actual reference area is set differently for each frame, and the unauthorized third party can not recognize the reference area correctly.

Such a chaos function may be displayed in a specific frame, such as an ID notice by an author, and may be transmitted to an authorized person only when necessary.

The deletion area to be deleted from the reference area may be any of the right or left side of the reference area, but if the right side is deleted from the reference area, the right side should also be deleted in the ID area.

In the above description, it has been described that the whole frequency is deleted by a predetermined width. However, in this case, since a lot of image distortion may occur, it is preferable to delete only a specific portion of the frequency height rather than delete the entire frequency. It is desirable to delete at least 2% to 5%, preferably 3%, in the entire X-axis range of the frequency domain so that the predetermined width is set to be wider than the above description in order to be distinguished from the noise.

In addition, a specific part of the frequency height to be deleted may be the upper part of the reference area or the area where the ID area meets the frequency curve, or the upper 10% of the ID area or the entire area of the reference area may be deleted, It is desirable to minimize the image distortion due to the frequency deletion.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention. The scope of the invention should therefore be construed in light of the claims set forth to cover many of such variations.

10: full frame
20: Selected frame
30: Frequency domain
40: reference area
50: Delete area
60: separation distance
70: ID area
80: ID notice area

Claims (9)

A frame designation step (S1) of designating an arbitrary frame among a plurality of frames constituting a video stream as a frame to which an ID is to be assigned;
A frequency conversion step (S2) of converting the designated frame into a frequency domain;
A step (S3) of deleting a certain portion in a specific region of the converted frequency domain;
(S4) of erasing at least a part of the ID area spaced apart from the predetermined part by a spacing distance corresponding to a predetermined position value of an ID to be given
Digital rights protection of video streams using frequency modulation.
The method according to claim 1,
If the ID has a number of k (k is a natural number equal to or greater than 2), an ID of the most significant bit position is assigned to a first frame of the arbitrary frames, an ID of each sequential bit value is sequentially assigned to each frame, And a recording step (5) of giving an ID of the lowest position value to the k-th frame
Digital rights protection of video streams using frequency modulation.
The method according to claim 1,
The ID of the ID giving step (S4) is an author specific code
Digital rights protection of video streams using frequency modulation.
The method according to claim 1,
And the ID of the ID giving step (S4) is recorded in the first frame of the video stream
Digital rights protection of video streams using frequency modulation.
The method according to claim 1,
Characterized in that arbitrary frames of the frame designation step (S1) are selected and designated randomly.
Digital rights protection of video streams using frequency modulation.
6. The method of claim 5,
Characterized in that the randomly designated frame is selected in frames per second of the video stream from the first frame
Digital rights protection of video streams using frequency modulation.
The method according to claim 1,
Wherein any frame selected and designated in the frame designation step (S1) is the first frame of the video stream
Digital rights protection of video streams using frequency modulation.
The method according to claim 1,
Wherein the specific region is one end region of the frequency region.
The method according to claim 1,
Wherein the specific region is an area spaced apart by a distance corresponding to a number determined by a chaos function at one end of the frequency region
Digital rights protection of video streams using frequency modulation.

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