KR20100060413A - Receiving system and method of processing data - Google Patents

Abstract

PURPOSE: A receiving system for processing data, and a method thereof are provided to interpolate one among images of 3D contents and display the interpolated image, thereby preventing distortion of depth information of an object by time difference of a display. CONSTITUTION: A receiving unit receives broadcasting signal. A decoding unit(110) decodes received three-dimensional contents by codec information. The decoding unit restores the first video and the second video from the 3D contents. An interpolation unit(120) generates the third video based on the restored second image. A display unit(130) successively displays the restored first image and the generated third image.

Description

Receiving system and method of processing data}

The present invention relates to an apparatus and method for processing an image signal, and more particularly, to a receiving system and a data processing method for receiving and processing a three-dimensional image signal.

In general, three-dimensional (3D) image (or stereoscopic image) is based on the stereo vision principle of two eyes. The parallax of two eyes, that is, the binocular parallax due to the distance between two eyes that are about 65mm apart, is an important factor to make a sense of three-dimensional feeling. By fusing the 3D image, the original depth and reality can be reproduced.

Such 3D image display is largely classified into a stereoscopic method, a volumetric method, and a holographic method. For example, a 3D image display apparatus using a stereoscopic technique is an image display apparatus that adds depth information to a 2D image and uses the depth information to allow an observer to feel the liveness and reality of 3D.

In addition, there are two methods of displaying 3D images, a method of wearing glasses and a glasses-free method of not wearing glasses.

The way of wearing glasses is divided into passive and active. The passive method distinguishes between a left image and a right image using a polarization filter. That is, the passive method is a method of wearing blue and red sunglasses, respectively, in both eyes. The active method distinguishes the left image from the right image by sequentially covering the left eye and the right eye in time. In other words, the active method is a method of periodically repeating a time-divided screen and wearing and viewing glasses with an electronic shutter synchronized to the period, and may also be referred to as a time split type or shuttered glass method. .

Representative examples of glasses-free glasses-free methods include a lenticular method in which a lenticular lens plate in which cylindrical lens arrays are vertically arranged in front of the image panel, and a barrier layer having periodic slits on the image panel. There is a parallax barrier (parallax barrier) method having a.

An object of the present invention is to provide a receiving system and a data processing method for compensating for distortion caused by display time difference when a 3D image is displayed by alternately displaying a left image and a right image.

A reception system according to an embodiment of the present invention may include a receiver, a decoder, a compensator, and a display device. The receiver receives a broadcast signal including 3D content and system information related to the 3D content. The decoder decodes the received 3D content based on codec information to reconstruct a first image and a second image from the 3D content. The compensator generates a third image based on the second image reconstructed by the decoder. The display device sequentially displays a first image reconstructed by the decoder and a third image generated by the compensator.

The apparatus may further include a system information processor configured to extract codec information of the 3D content from the system information and output the codec information to the decoder.

The compensation unit may include a first image storage unit storing a first image output from the decoder, a second image storage unit storing a second image output from the decoder, and outputting the second image as a reference image, and storing the second image. An interpolator for generating a third image based on the at least one reference image output from the unit, a third image storage unit for storing the third image output from the interpolator, and a first image stored in the first image storage unit It may include a selection unit for sequentially outputting the image and the third image stored in the third image storage unit.

In a data processing method of a reception system according to an embodiment of the present invention, receiving a broadcast signal including 3D content and system information related to the 3D content, and decoding the received 3D content based on codec information. Restoring a first image and a second image from 3D content, generating a third image based on the restored second image, and sequentially displaying the restored first image and the generated third image It may include the step.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

The receiving system and the data processing method according to the present invention receive 3D contents having the same sampling time of the left image and the right image, reconstruct the left image and the right image, and sequentially display the interpolated images of one of the two images. Display. By doing so, it is possible to prevent the depth information of the object (object) from being distorted due to display parallax.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described. At this time, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, by which the technical spirit of the present invention and its core configuration and operation is not limited.

The terms used in the present invention were selected as widely used general terms as possible in consideration of the functions in the present invention, but may vary according to the intention or custom of the person skilled in the art or the emergence of new technologies. In addition, in certain cases, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the corresponding description of the invention. Therefore, it is intended that the terms used in the present invention should be defined based on the meanings of the terms and the general contents of the present invention rather than the names of the simple terms.

The present invention is to compensate for the distortion caused by the display parallax when the display device of the receiving system capable of processing the 3D image is an active method to sequentially show the left image and the right image.

The 3D image may include a stereo (or stereoscopic) image considering two views and a multiview image considering three or more views.

The stereo image refers to a pair of left and right images obtained by photographing the same subject with a left camera and a right camera spaced apart from each other by a certain distance. The multi-view image refers to three or more images obtained by photographing the same subject with three or more cameras having a constant distance or angle.

The transmission format of the stereo video includes a single video stream format and a multi video stream format. As the single video stream format, the side by side of FIG. 1A, the top / down of FIG. 1B, and the interlaced FIG. ), A frame sequential of FIG. 1D, a checker board of FIG. 1E, an anaglyph of FIG. 1F, and the like. As the multi video stream format, full left / right of FIG. 2A, full left / half right of FIG. 2B, and FIG. 2C ) 2D video / depth. For example, in the side-by-side format of FIG. 1A, the left and right images are each half subsampled in the horizontal direction, and the sampled left image is positioned on the left side and the sampled right image is positioned on the right side. In this case, one stereo image is created. In the top / down format of FIG. 1 (b), one stereo image is placed by sub-sampling the left image and the right image in the vertical direction, and the sampled left image is placed at the top and the sampled right image is placed at the bottom. If it is created. In the interlaced format of FIG. 1C, the left and right images are each half subsampled in the vertical direction, and the pixels of the sampled left image and the pixels of the right image are alternately positioned for each line so that a stereo image can be obtained. In this case, a stereo image is created by sub-sampling the left image and the right image 1/2 in the horizontal direction, and placing the pixels of the sampled left image and the pixels of the right image alternately one pixel. In the checker board format of FIG. 1E, the left image and the right image are 1/2 subsampled in the vertical and horizontal directions, respectively, and the pixels of the sampled left image and the pixel of the right image are alternately positioned by one pixel. This is the case when a stereo image is made.

In addition, the full left / right format of FIG. 2 (a) is a case in which left and right images are sequentially transmitted, respectively. In the full left / half right format of FIG. This is the case when 1/2 subsampling is transmitted in the vertical or horizontal direction. The 2D video / depth format of FIG. 2C is a case in which one of a left image and a right image is transmitted together with depth information for generating another image.

In this case, the stereo image or the multi-view image are compressed and encoded by MPEG or various methods and transmitted to the receiving system.

For example, stereo images such as the side-by-side format, the top / down format, the interlaced format, the checker board, and the like may be compressed and transmitted in the H.264 / AVC method. In this case, a 3D image may be obtained by decoding the stereo image in the inverse of the H.264 / AVC coding scheme in the reception system.

In addition, one of the left image or the multiview image of the full left / half right format is assigned as a base layer image, and the remaining images are assigned as an enhanced layer image, and then the base layer image is mono. Encoding is performed in the same manner as the scopic video, and an upper layer video may be encoded and transmitted only for correlation information between a base layer and an upper layer image. Examples of the compression encoding scheme for the image of the base layer may be JPEG, MPEG-1, MPEG-2, MPEG-4, H.264 / AVC method, the present invention uses the H.264 / AVC method In one embodiment. In addition, as an embodiment, the compression coding scheme for the video of the higher layer uses the H.264 / MVC (Multi-view Video Coding) scheme. In this case, the stereo image is allocated to the base layer image and one higher layer image, but the multiview image is allocated to the base layer image and the plurality of higher layer images. A criterion for dividing the multi-view image into an image of a base layer and an image of one or more higher layers may be determined according to the position of the camera or may be determined according to the arrangement of the cameras. Or it may be arbitrarily determined without following any special criteria.

The present invention restores a left image and a right image from a stereo image or a multiview image received by compression encoding, and compensates for distortions that may occur due to display parallax when sequentially displaying the reconstructed left image and right image. It is characterized by. The display parallax occurs when the left image and the right image having the same sampling time are sequentially displayed with a time difference. The display parallax may cause distortion in the 3D image displayed on the screen.

For example, suppose that sampling times of a left image and a right image acquired by a plurality of cameras at the same time are the same. In this case, when the left and right images having the same sampling time are shown to the left eye and the right eye with a time difference, the display apparatus of the receiving system may cause distortion.

3 (a) shows an example of photographing an object moving from left to right with a trapezoid as a background with a stereo camera. At this time, each image was sampled at the same time and shows a different depth from the trapezoidal shape shown behind. In Figure 3 (a) it is assumed that the front of the trapezoidal shape.

Suppose that the display device is an active type that sequentially shows left and right images in time. In this case, FIG. 3B shows a left image as in the sampling time, and FIG. 3C shows an example of displaying the right image in the middle of the sampling time.

That is, after sampling the left image and the right image at time t0, t2, t4, the left image is displayed at time t0, t2, t4, and the right image is displayed at time t1, t3, t5.

FIG. 3 (d) shows an example of a left image accepted by the brain at the time when the right image is displayed when the left image and the right image are displayed with a time difference as shown in FIGS. 3 (b) and 3 (c). It can be seen that distortion occurs due to display parallax of the left and right images.

That is, when the object does not move, it looks at the original depth, but when the object starts to move, it may appear shallower than the original depth depending on the direction, or may appear deeper than the original depth. This is called a distortion that occurs when the sampling time and the display time of the left and right images are different, that is, in display disparity.

4 is a block diagram illustrating an embodiment of a receiving system according to the present invention for compensating for such distortion, and may include a decoding device 110, a compensator 120, and a display device 130.

The compensation unit 120 may be included in any one of the decoding device 110 and the display device 130, or may be separately configured as shown in FIG. In addition, the decoding apparatus 110, the compensator 120, and the display apparatus 130 may be integrated or may be separated.

The decoding device 110 receives and decodes a stereo image or a multiview image from a content source (not shown) to reconstruct the original image.

The content source includes 3D content for a 3D image. For example, the content source may be a disc, an internet server, a terrestrial / satellite / cable broadcasting station, or the like.

The decoding device 110 may be a disc player, an IPTV settop box, a terrestrial television, a satellite, a cable, or the like that can watch a cable.

FIG. 5 is a detailed block diagram illustrating an embodiment of the decoding apparatus of FIG. 4. The decoding device 110 controls the controller 211, the user interface 212, the receiver 213, the demultiplexer 214, the system information processor 215, the audio decoder 216, and the video decoder 217. It may include.

That is, 2D video or 3D video content transmitted from a content source and system information necessary to decode the 2D video or 3D video are received by the receiver 213.

When a specific channel to be received is selected through the user interface 212, the controller 211 controls the receiver 213 to receive 2D content or 3D content of the corresponding channel.

The receiver 211 performs demodulation and channel equalization on 2D content or 3D content of a specific channel and then outputs it to the demultiplexer 214 in the form of a stream. System information received by the receiver 211 is also output to the demultiplexer 214 in the form of a stream.

The demultiplexer 214 outputs the audio stream to the audio decoder 216 with reference to the packet identifier (PID) of each stream, and outputs the video stream to the video decoder 217, and the system information is the system information processor 215. )

The system information processor 215 extracts a PID necessary for demultiplexing the demultiplexer 214 from the system information and provides the PID to the demultiplexer 214.

The system information is sometimes called service information in some cases. The system information may include channel information, program information, event information, and the like.

In the embodiment of the present invention, PSI / PSIP (Program Specific Information / Program and System Information Protocol) is applied as the system information, but the present invention is not limited thereto. That is, a protocol for transmitting system information in a table format may be applicable to the present invention regardless of its name.

The PSI is a system standard of MPEG-2 defined for classifying channels and programs, and the PSIP is an Advanced Television Systems Committee (ATSC) standard for classifying channels and programs.

The PSI may include, as an embodiment, a Program Association Table (PAT), a Conditional Access Table (CAT), a Program Map Table (PMT), and a Network Information Table (NIT).

The PAT is special information transmitted by a packet having a PID of '0', and transmits PID information of a corresponding PMT and PID information of a NIT for each program. The CAT transmits information about the pay broadcasting system used on the transmitting side. The PMT transmits the program identification number, PID information of a transport stream packet to which individual bit streams such as video and audio constituting the program are transmitted, and PID information to which PCR is transmitted. The NIT transmits information of an actual transmission network. For example, a PAT table with a PID of 0 is parsed to find a program number and a PID of a PMT. When the PMT obtained from the PAT is parsed, the correlation between the components constituting the program can be known.

In one embodiment, the PISP includes a virtual channel table (VCT), a system time table (STT), a rating region table (RTT), an extended text table (ETT), a direct channel change table (DCCT), and a direct channel change selection (DCCSCT). A code table, an event information table (EIT), and a master guide table (MGT) may be included.

The VCT transmits information about a virtual channel, for example, channel information for channel selection and packet identifier (PID) for receiving audio and / or video. In other words, when the VCT is parsed, the PID of the audio and video of the broadcast program loaded in the channel can be known along with the channel name and the channel number. The STT transmits current date and time information, and the RRT transmits information about a region and a review institution for a program grade. The ETT transmits an additional description of a channel and a broadcast program, and the EIT transmits information (eg, title, start time, etc.) about an event of a virtual channel. The DCCT / DCCSCT transmits information related to automatic channel change, and the MGT transmits version and PID information of respective tables in the PSIP.

In the present invention, identification information for recognizing that the program received by the receiving unit 213 is 3D content may be included in the system information. In this case, the system information processing unit 215 extracts it and provides it to the demultiplexer 214. do.

In the present invention, transmission format information for identifying which transmission format the 3D content is received may be included in the system information. According to an embodiment of the present invention, transmission format information is included in at least one table of PMT and VCT and received. That is, when the system information processing unit 215 parses the transmission format information received in the PMT or VCT, the 3D content is side by side, top / down, and interlaced. (interlaced), frame sequential, checker board, anaglyph, full left / right, full left / half right, 2D It is possible to know in which transmission format the video / depth is received.

In the present invention, when the 3D content is a multiview image, view information for decoding a multiview image may be included in the system information and received. According to an embodiment of the present invention, the viewpoint information is also received by including viewpoint information in at least one table of the PMT and the VCT. That is, when the system information processor 215 parses the view information received in the PMT or the VCT, the information about the view and the view referred to when encoding the image of the view may be obtained.

At least one of the transmission format information and the view information parsed by the system information processor 215 is provided to the video decoder 217 or directly through the demultiplexer 214 or the control unit 211 for decoding the video stream. In the present invention, the transport format information and the viewpoint information will be referred to as codec information for convenience of description.

If the video stream output from the demultiplexer 214 is a video stream of a stereo image, the video decoder 217 decodes the video stream input based on the transmission format information among the codec information in the H.264 / AVC method and performs the left. In an embodiment, the image and the right image are restored. For example, if the transmission format information indicates that the 3D content is transmitted in the side-by-side format as shown in FIG. 1A, the video decoder 217 horizontally moves the video stream in the H.264 / AVC manner. Decoded with respect to the left and right image can be restored.

The video decoder 217 outputs one of the reconstructed left image and the right image to the first buffer 121 of the compensator 120, and outputs the other image to the third buffer 123. That is, the image to be output to the display device 130 is output to the first buffer 121 as it is, and the image to be output to the display device 130 through the interpolation process is output to the third buffer 123. According to an embodiment of the present invention, the left image is output to the first buffer 121 and the right image is output to the third buffer 123.

In addition, if the video stream output from the demultiplexer 214 is a video stream of a multiview image, the video decoder 217 decodes the input video stream based on the viewpoint information among the codec information to restore the multiview image. For example, the image of the base layer is decoded by the H.264 / AVC scheme, and the image of the higher layer is decoded by the H.264 / MVC scheme to restore the original multi-view image. The present invention selects a left image to be shown in the left eye and a right image to be shown in the right eye among the restored multi-view images, and outputs the selected left image to the first buffer 121 and the right image to the third buffer 123. In one embodiment, outputting is performed.

For convenience of description, the left image input to the first buffer 121 will be referred to as a first image, and the right image input to the third buffer 123 will be referred to as a second image.

That is, the compensator 120 temporarily stores a first image output from the decoding apparatus 110 and a first image output after being temporarily stored in the first buffer 121. A second buffer 122, a third buffer temporarily storing a second image output from the decoding apparatus 110, and a second buffer temporarily storing the second image output after being temporarily stored in the third buffer 123. An interpolator 125 for generating a third image by performing interpolation based on a fourth buffer 124, a second image output from the third and fourth buffers 123 and 124, and the interpolator 125. The display device 130 selects one of a fifth buffer 126 that temporarily stores the third image generated by the second image, and a third image of the second buffer 122 and a third image of the fifth buffer 126. It may include a selection unit 127 for outputting.

The first to fifth buffers 121 to 124 and 126 may be designed to have a size of at least one field or one frame. For example, when designed to have a size of one frame, the first to fifth buffers 121 to 124 and 126 serve as frame delays.

In this case, the first buffer 121 receives the first image decoded by the decoding device 110 and outputs the first image after being delayed for one frame and then outputted to the second buffer 122. The second buffer 122 delays the first image output by being delayed from the first buffer 121 for a predetermined time (for example, for one frame) and outputs the delayed first image to the selector 127.

The third buffer 123 receives the second image decoded and output from the decoding apparatus 110 and delays it for one frame and then outputs the second image to the fourth buffer 124 and the interpolator 125. The fourth buffer 124 delays the second image output from the third buffer 123 for another frame and then outputs the second image to the interpolator 125.

That is, the second image output from the third buffer 123 becomes the current second image, and the second image output from the fourth buffer 124 becomes the previous second image.

The interpolator 125 generates a third image by interpolating based on the current second image output from the third buffer 123 and the previous second image output from the fourth buffer 124. In the present invention, an image referred to for generating a third image is referred to as a reference image. In the present invention, the current second image and the previous second image become reference images.

The interpolation method may vary depending on the number of input images, which of the left and right images sampled at the same time is displayed first.

If it is assumed that the display device 130 first displays the first image, that is, the left image, and then displays the second image, that is, the right image, the interpolator 125 uses the previous right image and the current right image. According to an embodiment of the present invention, interpolation is performed based on an image to generate a third image, that is, a new right image.

In this case, there are various methods of generating a new image through interpolation. For example, if there is motion between two reference images, a motion vector may be extracted from the two images and used to generate a new image. The motion vector represents the degree and direction of motion between images.

If there is no motion between the two reference images, a new image may be generated by calculating the average of the two images. Since the method of generating a new image by referring to at least one image in the interpolator 125 is easy to be changed by those skilled in the art, the present invention will not be limited to the above-described embodiment.

6 shows a process of creating a new image f (n) by estimating a motion vector from the current image f (n + 1) and the previous image f (n-1) in the interpolator 125.

For example, assuming that left and right images are simultaneously sampled and received at times t (n-1) and t (n + 1), the left image and the right image decoded by the decoding apparatus 110 have a time t ( n-1), t (n + 1). In this case, it is assumed that the left image is displayed at the time t (n-1) and t (n + 1) and the right image is displayed at the time t (n) and t (n + 2) in the display device 130.

In this case, the interpolator 125 finds a motion vector that knows where the object included in the previous right image f (n-1) is located in the current right image f (n + 1). The right image f (n) necessary for the time t (n) is generated using the motion vector and the previous right image f (n-1) or the current right image f (n + 1).

If the capacity of the buffer or the number of buffers can be increased, a new right picture may be generated using more reference pictures than the reference pictures used for interpolation. At this time, the more the reference image is, the higher the resolution of the new image, but the price increases due to the increase in the buffer, the number of reference images and the interpolation method is determined according to the system.

The third image generated by the interpolator 125 is output to the fifth buffer 126, delayed for a predetermined time (for example, for one frame), and then output to the selector 127.

The selector 127 may be implemented using a switching element, a mux, or the like. The selector 127 may include the first images L1, L2, ... stored in the second buffer 122 and the third images R1 ', R2', ..., stored in the fifth buffer 126. Are sequentially selected and output to the display device 130. In FIG. 7, L1, L2, ... denote a first image, that is, a left image, output from the second buffer 122 to the selector 127, and R1, R2, ... denote interpolators 125. In FIG. The second image, i.e., the right image, is inputted as). R1 ', R2', ... display a third image, that is, a new right image, output from the fifth buffer 126 to the selector 127.

The display device 130 displays an image output from the decoding device 110 or the compensator 120 in a two-dimensional or three-dimensional form. The display device may be a device capable of displaying a general 2D image, a device capable of displaying a 3D image requiring glasses, or a device capable of displaying a 3D image not requiring glasses.

According to an embodiment of the present disclosure, the display apparatus 130 creates and displays a 3D image using various methods using the first image and the third image output from the selector 127 of the compensator 120.

According to an embodiment of the present invention, the display device 130 uses a shuttered glass method that sequentially displays a left image and a right image of a method of wearing glasses.

To this end, the display device 130 includes a shutter glass according to an embodiment.

The shutter glass is a device that should be worn by a user to view a 3D image displayed on a screen of the display device 130. The shutter glass provides a 3D image to the user by alternately opening and closing the left and right lenses according to a synchronization signal (not shown). That is, the left and right images are alternately blocked as the left and right lenses of the shutter glass are alternately opened and closed, so that different images are formed between the left and right eyes, thereby allowing the user to feel a three-dimensional effect. In other words, the left and right lenses of the shutter glass are alternately opened and closed, so that only the left image is seen by the left eye of the user, and only the right image is seen by the right eye. You will feel as if you are watching them at the same time, and as a result, the image will appear three-dimensional.

Referring to FIG. 7, the display device 130 first displays a first image, that is, a left image, output from the selector 127 for the same sampling time, and then a third image output from the selector 127. That is, a new right image is displayed. If the 3D image is repeated by repeating this process, distortion due to display parallax does not occur.

If the 2D content is transmitted from the content source, the decoding device 110 separates the video stream and the audio stream according to the conventional scheme, decodes each of the decoding algorithms, and outputs them directly to the display device 130. The display device 130 displays a 2D image in a conventional manner.

As described above, the reception system and the data processing method according to the present invention receive 3D content having the same sampling time of the left image and the right image, restore the left image and the right image, and sequentially display one of the two images. Interpolate and display the image. By doing so, it is possible to prevent the depth information of the object (object) from being distorted due to display parallax.

The present invention is effective when applied to a display device of a different time that the left image and the right image are respectively visible.

The present invention described so far is not limited to the above-described embodiments, and can be modified by those skilled in the art as can be seen from the appended claims, and such modifications are the scope of the present invention. Belongs to.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

1 illustrates examples of a single video stream format among 3D video transmission formats according to the present invention.

2 is a diagram illustrating examples of a multi video stream format among 3D video transmission formats according to the present invention.

3A to 3D are views illustrating a process of displaying a left image and a right image sampled at the same time;

4 is a block diagram showing an embodiment of a receiving system according to the present invention;

5 is a detailed block diagram illustrating an embodiment of the decoding apparatus of FIG. 4.

FIG. 6 is a diagram illustrating an embodiment of an interpolation process of the compensator of FIG. 4. FIG.

FIG. 7 illustrates an embodiment of a process of displaying a left image and an interpolated right image in the display device of FIG. 4; FIG.

* Description of the symbols for the main parts of the drawings *

110: decoding device 120: compensation unit

130: display device

211: control unit 212: user interface unit

213: receiver 214: demultiplexer

215: system information processing unit 216: audio decoder

217: Video Decoder

Claims (12)

A receiver configured to receive a broadcast signal including 3D content and system information related to the 3D content; A decoder configured to decode the received 3D content based on codec information to reconstruct a first image and a second image from the 3D content; A compensator configured to generate a third image based on the second image reconstructed by the decoder; And And a display device configured to sequentially display the first image reconstructed by the decoder and the third image generated by the compensator. The method of claim 1, And a system information processing unit for extracting codec information of the 3D content from the system information and outputting the codec information to the decoding unit. The method of claim 2, The codec information includes at least one of transmission format information and viewpoint information. The method of claim 1, wherein the compensation unit A first image storage unit for storing a first image output from the decoder; A second image storage unit for storing the second image output from the decoder and outputting the second image as a reference image; An interpolator configured to generate a third image based on at least one reference image output from the second image storage unit; A third image storage unit which stores a third image output from the interpolator; And And a selection unit configured to sequentially output the first image stored in the first image storage unit and the third image stored in the third image storage unit. 5. The apparatus of claim 4, wherein the interpolator is And receiving a previous second image and a current second image from the second image storage unit, extracting a motion vector between the two images, and then generating a third image using the extracted motion vector. The method of claim 1, And the first and second images are left images and right images sampled at the same time. Receiving a broadcast signal including 3D content and system information related to the 3D content; Restoring a first image and a second image from the 3D content by decoding the received 3D content based on codec information; Generating a third image based on the reconstructed second image; And And sequentially displaying the reconstructed first image and the generated third image. The method of claim 7, wherein Extracting codec information of the 3D content from the system information and outputting the codec information to the decoding step. The method of claim 8, The codec information includes at least one of transmission format information and viewpoint information. 8. The method of claim 7, wherein the compensating step is Storing the restored first image; Storing the restored second image and outputting the restored second image as at least one reference image; Generating a third image based on the reference image; Storing the generated third image; And And sequentially outputting the restored and stored first image and the generated and stored third image. The method of claim 10, wherein the generating of the third image And extracting a motion vector between a previous second image and a current second image among the reference images, and then generating a third image using the extracted motion vector. The method of claim 7, wherein And the first and second images are a left image and a right image sampled at the same time.

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