KR100667775B1 - Apparatus and Method for reproducing image - Google Patents

Abstract

Disclosed are a video reproducing apparatus and method in a home network. The present invention provides a video playback method comprising the steps of: a) receiving an original video and a noise video from a content provider into a home network; b) reproducing the overlapping image generated by overlapping the original image and the noise image when the user does not have a right to the original image in the home network. According to the present invention, a user who does not have a legitimate authority in the transmission of a digital image can view a part of the image that does not pay a fee, thereby inducing a curiosity for the user to generate a desire to purchase.

Description

Image playback method and device {Apparatus and Method for reproducing image}

1 is a diagram showing a method of playing content in a conventional home network.

2 is a diagram showing a video reproducing method according to the first embodiment of the present invention;

3 is a diagram showing a video reproducing method according to a second embodiment of the present invention;

4 is a diagram showing a video reproducing method according to a third embodiment of the present invention;

5 is a diagram showing a video reproducing method according to a fourth embodiment of the present invention;

6 is a diagram illustrating an internal configuration of a video reproducing apparatus for implementing the method of FIG.

FIG. 7 is a diagram illustrating an internal configuration of an image reproducing apparatus for implementing the method of FIG. 5.

The present invention relates to an image reproducing apparatus and method in a home network, and more particularly, to an image reproducing apparatus and method for maximizing marketing effect by showing a synthesized image of a noise image even to a user who does not have a right. .

At present, the transmission of digital content to the home network is widely used. The use of digital content within the home network is based on the premise of obtaining legitimate rights.

1 is a diagram illustrating a method of playing content in a conventional home network.

First, the content provider CP transmits an encrypted image E (K_cont, I) to the home server HS. Where K_cont is the content key and I is the video.

The home server HS extracts the decrypted image I by decrypting the encrypted image E (K_cont, I) using the content key K_cont, and then encrypts it again using the home key K_home which is a key in the home network. Create K_home, I).

The user device UD is authenticated whether or not the device has a legitimate authority from the home server HS, and the authenticated user device UD acquires the image I by decrypting the encrypted content E (K_home, I) by obtaining the home key K_home, and reproduces it. Can be. However, since the unauthenticated user device UD_unauth has not obtained the home key K_home, it cannot decrypt the encrypted content E (K_home, I) and as a result, cannot play the image I.

However, according to the conventional video reproducing method, since the unauthorized user device UD_unauth cannot play any video, it cannot have any purchase intention. Since no decryption is performed without the home key K_home, no screen appears on the screen, so that the user does not have any curiosity about the screen and the desire to purchase is not inspired. Generally speaking, this is undesirable for marketing effects when looking at purchasing practices that increase the probability of purchasing a video.

In particular, in the transmission of analog video, it is possible to employ a method of masking the distortion or part of the video by using macrovision technology. There is a problem that can not be.

Accordingly, the present invention has been made to solve the above-mentioned problems, and the user who does not have a legitimate authority even in the transmission of digital images, can see a part of the image that does not pay a fee to induce a user's curiosity and intention to purchase An object of the present invention is to provide a method and an apparatus for reproducing an image.

According to an aspect of the present invention, there is provided a video playback method comprising the steps of: a) receiving an original video and a noise video from a content provider into a home network; b) reproducing the overlapping image generated by overlapping the original image and the noise image when the user does not have a right to the original image in the home network.

Here, step a) includes receiving a noise level required to generate the noise image instead of the noise image, and between steps a) and b), c) based on the noise level And further comprising generating a noise image.

In addition, the present invention provides a video reproducing apparatus in a home network, comprising: a) a decompression unit extracting an original video and a noise video by decompressing an integrated compressed video obtained by compressing an original video and a noise video received from a content provider; b) a CPS unit that determines whether the user has obtained the right to the original image based on the license; c) an overlapping unit for generating an overlapping image by overlapping the original image and the noise image when there is no permission; And d) a reproducing unit for reproducing the overlapped image.

In addition, the present invention provides a video playback apparatus in a home network, comprising: a) a decompression unit for extracting an original video by decompressing a compressed video compressed with an original video received from a content provider; b) a CPS unit that determines whether the user has obtained the right to the original image based on the license; c) a noise generator for generating a noise image based on the noise level received from the content provider if there is no permission; an overlapping unit generating an overlapping image by overlapping the original image and the noise image; And e) a reproduction unit for reproducing the overlapped image.

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

2 is a diagram showing a video reproducing method according to the first embodiment of the present invention.

In step 210, the content provider CP generates the encrypted content E (K_cont, OI || NI) by encrypting the noisy image NI and the original image OI with the content key K_cont, and sends it to the home server HS.

In step 220, the home server HS obtains the content key K_cont for the original video OI through payment.

In step 230, the home server HS decrypts the encrypted content E (K_cont, OI || NI) using the content key K_cont, extracts the original image OI and the noise image NI, and transmits the original image OI to the user device UD.

In operation 240, the user device UD determines whether the user has obtained the right to the video OI based on the license. This procedure is performed by a Copy Protection System in the user equipment, which is well known to those skilled in the art. If yes, go to step 250; otherwise, go to step 260.

In step 250, the user device UD plays the original video OI.

In operation 260, the user device UD generates the overlapped image I_over by overlapping the original image OI and the noise image NI, and then reproduces the overlapped image I_over.

In one embodiment of the invention, the home server HS and the user device UD are encrypted and transmitted with a separate key defined within the home network. That is, the data transmission between the home server HS and the user device UD is preferably implemented in a link-protected state. Because the home server HS transmits an unencrypted image to the user device UD, if the unauthorized third party user device illegally hacks the transmission channel between the home server HS and the user device UD, the third user device This is because unreasonable cases of playing the original video may occur.

3 is a view showing a video reproducing method according to a second embodiment of the present invention.

In step 310, the content provider CP generates the encrypted content E (K_cont, OI) by encrypting the original video OI with the content key K_cont.

In step 320, the content provider CP sends the noise level NL and the encrypted content E (K_cont, OI) to the home server HS.

Since the noise level NL is arbitrarily selected by the content provider CP, the content provider can select the noise level NL differently for each image, thereby maximizing the marketing effect by adjusting the noise level of the original image shown to the user.

In step 330, the home server HS obtains the content key K_cont for the original video OI through payment.

In step 340, the home server HS extracts the original video OI by decrypting the encrypted content E (K_cont, OI) using the content key K_cont and transmits it to the user device UD.

In operation 350, the user device UD determines whether the user has obtained a legitimate authority for the video OI based on the license. If yes, go to step 360; otherwise, go to step 370.

In step 360, the original image extracted in step 340 is reproduced.

In operation 370, the user device UD generates a noise image NI using the noise level NL received in operation 320.

A method for generating a noise image from a noise level is well known to those skilled in the art, and can be generated by, for example, a program such as Equation 1 below. Z is a noise level value.

[Equation 1]

In operation 380, the user device generates and reproduces the overlapped image I_over by overlaying the noise image NI generated in operation 370 and the original image OI extracted in operation 340.

As in the case of Fig. 2, in the modified embodiment of the present invention, the home server HS and the user device UD are encrypted and transmitted with a separate key defined in the home network.

4 is a diagram showing a video reproducing method according to a third embodiment of the present invention.

In step 410, the content provider CP generates an integrated compressed image ICI by compressing the noise image NI with the original image OI. Compression here refers to video compression standards such as MPEG.

A method of compressing an original image and a noise image together is well known by those skilled in the art, for example, as follows.

First, in the MPEG TS, the content provider randomly includes a noise packet of the same size together with an image packet of 188 bytes and transmits it to the user device. In MPEG TS, a video is divided into 188 byte packets and transmitted. The packet is any one of a video packet, an audio packet, and a data packet. At this time, any one or more packets are transmitted as noise packets. Of course, the header of the packet includes information indicating that the packet is a noise packet.

Next, when the user equipment recognizes that the packet is a noise packet based on the information in the packet header, the information in the packet is recognized as information about the noise, and the noise process is performed using the noise information in the packet. .

In step 420, the content provider CP generates the encrypted content E (K_cont, ICI) by encrypting the integrated compressed video ICI with the content key K_cont, and then transmits the encrypted content E (K_cont, ICI) to the home server HS. .

In step 430, the home server HS obtains the content key K_cont for the original video OI through payment. The content key K_cont is the same as the content key used in step 420.

In step 440, the home server HS decodes the encrypted content E (K_cont, ICI) using the content key K_cont, extracts the integrated compressed image ICI, and transmits it to the user device UD.

In operation 450, the user equipment UD extracts the original image OI and the noise image NI by decompressing the integrated compressed image ICI.

In operation 460, the user device UD determines whether the user has obtained the right to the original video OI based on the license. If yes, go to Step 470; otherwise, go to Step 480.

In operation 470, the user device UD plays the original video OI.

In operation 480, the user device UD generates and reproduces the overlapped image I_over by overlaying the noise image NI and the original image OI extracted in operation 450.

5 is a diagram showing a video reproducing method according to a fourth embodiment of the present invention.

In step 510, the content provider CP generates the compressed video CI by compressing the original video OI. Compression here refers to video compression standards such as MPEG.

In step 520, the content provider CP generates the encrypted content E (K_cont, CI) by encrypting the compressed video CI with the content key K_cont, and selects the noise level NL.

Since the noise level NL is arbitrarily selected by the content provider CP, the content provider can select the noise level NL differently for each image, thereby maximizing the marketing effect by adjusting the noise level of the original image shown to the user. .

In step 525, the content provider CP sends the encrypted content E (K_cont, CI) and the noise level NL to the home server HS.

In step 530, the home server HS obtains the content key K_cont for the original video OI through payment. The content key K_cont is the same as the content key used in step 520.

In step 540, the home server HS extracts the compressed video CI by decrypting the encrypted content E (K_cont, CI) using the content key K_cont, and then transmits the compressed video CI and the noise level NL transmitted in step 525 to the user equipment UD. do.

In operation 550, the user device UD extracts the original video OI by decompressing the compressed video CI.

In operation 560, the user device UD determines whether the user has obtained a legitimate right for the original video OI based on the license. If yes, go to Step 570; otherwise, go to Step 580.

In operation 570, the user device UD plays the original video OI.

In operation 580, the user device UD generates a noise image NI using the noise level NL received in operation 540.

In operation 590, the user device generates and reproduces the overlapped image I_over by overlaying the noise image NI generated in operation 580 and the original image OI extracted in operation 550.

FIG. 6 is a diagram illustrating an internal configuration of an image reproducing apparatus for implementing the method of FIG. 4.

The video reproducing apparatus of FIG. 6 receives the integrated compressed video ICI from the home server HS and is included in the user device UD.

The image reproducing apparatus 600 of FIG. 6 includes a decompression unit 610, a CPS unit 620, an overlapping unit 630, and a reproducing unit 640.

The decompressor 610 extracts the original image 612 and the noise image 614 by decompressing the integrated compressed image 602 received from the home server HS, and transmits the extracted original image 612 and the overlapped portion 620.

Based on the license 604, the CPS unit 620 determines whether the user has obtained the right authority for the original image 612, and then generates a CPS signal 622 for identifying whether the authority is the overlapping unit ( 630). The CPS signal 622 is either an affirmative signal indicating privilege or a negative signal indicating no authority.

The overlapping unit 630 generates a reproduction image 632 to be reproduced by the reproduction unit 640 based on the original image 612, the noise image 614, and the CPS signal 622.

That is, when the CPS signal 622 is a positive signal, the overlapping unit 630 transmits the original video 612 as a playback video 632 to the playback unit 640 as it is, and the CPS signal 622 is a negative signal. In this case, the overlapped image I_over is generated by overlaying the original image 612 and the noise image 614 and then transmitted to the playback unit 640 as the reproduced image 632.

The playback unit 640 plays the playback image 632 transmitted from the overlapping unit 630. That is, the reproduction unit 640 reproduces the original image 612 or the overlapped image I_over.

FIG. 7 is a diagram illustrating an internal configuration of an image reproducing apparatus for implementing the method of FIG. 5.

The video reproducing apparatus of FIG. 7 receives the compressed video CI and the noise level NL from the home server HS and is included in the user device UD.

The image reproducing apparatus 700 of FIG. 7 includes a decompression unit 710, a CPS unit 720, an overlapping unit 730, and a reproduction unit 740.

The decompressor 710 extracts the original image 712 by decompressing the compressed image 702 received from the home server HS and transmits the original image 712 to the overlapping unit 720.

Based on the license 704, the CPS unit 720 determines whether the user has obtained a legitimate right for the original image 712, and then generates a CPS signal 722 that identifies whether the right is a noise generator. 750 and the overlap 730 is transmitted. CPS signal 722 is either an affirmative signal indicating privilege or a negative signal indicating no authority.

The noise generator 750 generates a noise image 752 from the noise level 706 only when the CPS signal 722 is a negative signal, and transmits the noise image 752 to the overlapping unit 730. If the CPS signal 722 is a positive signal, the noise image 752 is not generated.

The overlapping unit 730 generates a reproduction image 732 to be reproduced by the reproduction unit 740 based on the original image 712, the noise image 752, and the CPS signal 722.

That is, when the CPS signal 722 is a positive signal, the overlapping unit 730 transmits the original video 712 as a playback video 732 to the playback unit 740 as it is, and the CPS signal 722 is a negative signal. In this case, the overlapped image I_over is generated by overlaying the original image 712 and the noise image 752 and then transmitted to the playback unit 740 as the reproduced image 732.

The playback unit 740 plays the playback image 732 transmitted from the overlapping unit 730. That is, the reproduction unit 740 reproduces the original image 712 or the overlapped image I_over.

In FIG. 6 and FIG. 7, both the decompression unit is included. However, when the video is transmitted from the content provider to the user device without compression, all components related to compression and decompression may be omitted.

On the other hand, the image reproduction method according to the present invention can be created by a computer program. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the program is stored in a computer readable media, and read and executed by a computer to implement an image reproduction method. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, a user who does not have a legitimate authority even in the transmission of a digital image can view a part of the image for which the user does not pay a fee, thereby inducing a curiosity for the user to generate a desire to purchase.

In addition, according to the present invention, since the content provider can directly select the noise image or the noise level, the content provider can select a different degree of distortion for each content, thereby enabling more diverse marketing techniques.

Claims (5)

In the video playback method, a) receiving an original video and a noise level to be selected into the home network from a content provider; b) generating the noise image based on the noise level; And c) reproducing an overlapped image generated by overlapping the original image and the noise image when the user does not have a right to the original image in the home network; . delete The method of claim 1, wherein the step a) is performed in an encrypted state using a content key shared between a home server in the home network and the content provider. delete In a video reproducing apparatus in a home network, a) a decompression unit which extracts the original image by decompressing the compressed image compressed with the original image received from the content provider; b) a CPS unit that determines whether the user has obtained the right to the original image based on the license; c) a noise generator for generating a noise image based on the noise level received from the content provider if there is no permission; an overlapping unit generating an overlapping image by overlapping the original image and the noise image; And e) a reproducing unit for reproducing the overlapped image.

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