KR20080023210A - A method and apparatus for decoding a video signal - Google Patents

Abstract

A method and an apparatus for decoding a video signal are provided to define information capable of identifying pictures in a view point direction, thereby coding efficiently the video signal. A method for decoding a video signal comprises the following steps of: acquiring picture identification information for identifying a picture in a view point direction; inducing a first variable for generating a reference picture list for inter-view prediction by using the picture identification information; and generating the reference picture list for the inter-view prediction by using the first variable.

Description

A method and apparatus for decoding a video signal

The present invention relates to the coding of video signals.

Compression coding refers to a series of signal processing techniques that transmit digitized information through a communication line or store the data in a form suitable for a storage medium. The object of compression encoding includes objects such as voice, video, text, and the like. In particular, a technique of performing compression encoding on an image is called video image compression. The general feature of the video image is that it has spatial redundancy and temporal redundancy.

An object of the present invention is to improve the coding efficiency of a video signal.

It is intended to efficiently code a video signal by defining information that can identify pictures in a view direction.

Efficient random access is to be performed by defining information for identifying pictures in a view direction.

It is intended to perform efficient random access by providing a reference picture management method.

It is intended to efficiently code a video signal by providing a method for managing reference pictures used for inter-view prediction.

It is intended to efficiently code a video signal by providing a method of generating a reference picture list for inter-view prediction.

The present invention seeks to efficiently code a video signal by providing a method of rearranging a reference picture list for inter-view prediction.

According to the present invention, in coding a video signal, the video signal can be efficiently coded by defining information for identifying pictures in a view direction. In addition, more efficient random access may be performed by defining information for identifying pictures in a view direction. By providing a method for managing reference pictures used for inter-view prediction, coding can be performed more efficiently. When performing inter-view prediction using the present invention, the coding speed can be improved by reducing the burden of a decoded picture buffer (DPB), and more accurate prediction can be performed, thereby reducing the number of bits to be transmitted. You can also

In order to achieve the above object, the present invention provides a variable for obtaining picture identification information (view_num) for identifying a picture in a view direction and a first variable for generating a reference picture list for inter-view prediction using the picture identification information. (PicNum) and generating a reference picture list for the inter-view prediction using the first variable.

In addition, the present invention obtains the view information (view_id) for identifying the view point of the current picture, the step of obtaining a slice type (slice_type) of the current picture, and based on the view information and the slice type, in the view direction And deriving picture identification information (view_num) for identifying a picture and generating a reference picture list using the derived picture identification information.

The present invention also provides a variable derivation unit for deriving a variable PicNum for generating a reference picture list for inter-view prediction using picture identification information (view_num) for identifying a picture in a view direction and using the variable. A reference picture list generating unit for generating a reference picture list for inter-view prediction is provided.

The compression coding technique of video signal data considers spatial redundancy, temporal redundancy, scalable redundancy, and redundancy existing between views. In this compression encoding process, compression coding may be performed in consideration of mutual redundancy existing between views. The compression coding technique considering the inter-view redundancy is only an embodiment of the present invention, and the technical idea of the present invention may be applied to temporal redundancy, scalable redundancy, and the like. In addition, the term coding in this specification may include both the concepts of encoding and decoding, and may be flexibly interpreted according to the technical spirit and technical scope of the present invention.

1 is a schematic block diagram of a video signal decoding apparatus to which the present invention is applied.

The decoding apparatus includes a parsing unit 100, an entropy decoding unit 200, an inverse quantization / inverse transform unit 300, an intra prediction unit 400, a deblocking filter unit 500, a decoded picture buffer unit 600, Inter prediction unit 700 and the like. The decoded picture buffer unit 600 includes a reference picture storage unit 610, a reference picture list generator 630, a reference picture manager 650, and the like, and the reference picture list generator 630 is a variable. The derivation unit 631, the reference picture list initialization unit 635, and the reference picture list rearranging unit 640 are included.

 The parsing unit 100 performs parsing on a NAL basis to decode the received video image. In general, one or more sequence parameter sets and picture parameter sets are transmitted to the decoder before the slice header and slice data are decoded. In this case, various attribute information may be included in the NAL header area or the extension area of the NAL header. Since MVC is an additional technology to the existing AVC technology, it may be more efficient to add various attribute information only in the case of MVC bitstream rather than unconditionally adding. For example, flag information for identifying whether an MVC bitstream is included in the NAL header region or an extension region of the NAL header may be added. Attribute information about a multiview image may be added only when the input bitstream is a multiview image coded bitstream according to the flag information. For example, the attribute information may include view identification information, picture identification information in the view direction, inter-view picture group identification information, and interview. Inter-view prediction flag information, temporal level information, priority identification information, and identification information indicating whether the picture is a momentary decoded picture for a view. This will be described in detail with reference to FIG. 2.

The parsed bitstream is entropy decoded by the entropy decoding unit 200, and coefficients, motion vectors, and the like of each macroblock are extracted. The inverse quantization / inverse transform unit 300 multiplies the received quantized value by a constant constant to obtain a transformed coefficient value, and inversely transforms the coefficient value to restore the pixel value. Using the reconstructed pixel value, the intra prediction unit 400 performs intra prediction from the decoded samples in the current picture. Meanwhile, the deblocking filter unit 500 is applied to each coded macroblock in order to reduce block distortion. The filter smoothes the edges of the block to improve the quality of the decoded frame. The choice of filtering process depends on the boundary strength and the gradient of the image samples around the boundary. The filtered pictures are output or stored in the decoded picture buffer unit 600 for use as a reference picture.

The decoded picture buffer unit 600 stores or opens previously coded pictures in order to perform inter prediction. In this case, in order to store or open the decoded picture buffer unit 600, frame_num and POC (Picture Order Count) of each picture are used. Therefore, some of the previously coded pictures in MVC have pictures that are different from the current picture. Therefore, in order to utilize these pictures as reference pictures, not only the frame_num and the POC but also the view information for identifying the view point of the picture are included. It is available. In addition, information identifying a picture in a view direction having a concept similar to the frame_num may also be used. This will be described in detail with reference to FIG. 3.

The decoded picture buffer unit 600 includes a reference picture storage unit 610, a reference picture list generator 630, and a reference picture manager 650.

The reference picture storage unit 610 stores pictures that are referenced for coding the current picture. The reference picture list generator 630 generates a list of reference pictures for inter prediction. In multi-view video coding, since inter-view prediction may be performed, it may be necessary to generate a reference picture list for inter-view prediction when the current picture refers to a picture at a different view. In addition, a reference picture list for both temporal prediction and inter-view prediction may be generated. For example, when the current picture refers to a picture in a diagonal direction, a diagonal reference picture list may be generated. In this case, there may be various methods for generating the reference picture list in the diagonal direction. For example, information (ref_list_idc) for identifying a reference picture list may be defined. If ref_list_idc = 0, a reference picture list for temporal prediction may be indicated, if 1, a reference picture list for inter-view prediction may be indicated, and if 2, a reference picture list for temporal prediction and inter-view prediction may be indicated.

In addition, the diagonal reference picture list may be generated using the reference picture list for the temporal prediction or the reference picture list for the inter-view prediction. For example, reference pictures in a diagonal direction may be arranged in a reference picture list for temporal prediction. Alternatively, reference pictures in a diagonal direction may be arranged in a reference picture list for inter-view prediction. As such, when a list of various directions is generated, more efficient coding may be possible. In the present specification, the reference picture list for the temporal prediction and the reference picture list for the inter-view prediction are mainly described. However, the concept of the present invention may be applied to the reference picture list in the diagonal direction.

The reference picture list generator 630 may use information for identifying a picture in the view direction to generate a reference picture list for inter-view prediction. For example, information for identifying a picture in a view direction having a concept similar to that of frame_num may be used. This will be described in detail with reference to FIGS. 3 to 5.

The reference picture manager 650 manages the reference picture in order to more flexibly implement inter prediction. For example, an adaptive memory management control method and a sliding window method may be used. This is to manage the memory of the reference picture and the non-reference picture into one memory and manage them efficiently with less memory. In multi-view video coding, since pictures in a view direction may have the same Picture Order Count, information for identifying a view of each picture and / or information for identifying a picture in the view direction may be used for their marking. Can be used. Reference pictures managed through this process may be used in the inter predictor 700.

The inter prediction unit 700 performs inter prediction using a reference picture stored in the decoded picture buffer unit 600. Inter-coded macroblocks can be divided into macroblock partitions, where each macroblock partition can be predicted from one or two reference pictures. The inter prediction unit 700 compensates for the movement of the current block by using the information transmitted from the entropy decoding unit 200. A motion vector of blocks neighboring the current block is extracted from the video signal, and a motion vector prediction value of the current block is obtained. The motion of the current block is compensated by using the obtained motion vector prediction value and the difference vector extracted from the video signal. In addition, such motion compensation may be performed using one reference picture or may be performed using a plurality of pictures.

In multi-view video coding, when a current picture refers to pictures at different views, motion compensation is performed using information on a reference picture list for inter-view prediction stored in the decoded picture buffer unit 600. Can be done. In addition, motion compensation may be performed using view information for identifying the view of the picture and / or information for identifying the picture in the view direction.

Through the above process, the inter predicted pictures and the intra predicted pictures are selected according to the prediction mode to reconstruct the current picture. Hereinafter, various embodiments for providing an efficient decoding method of a video signal will be described.

2 is an embodiment to which the present invention is applied and shows attribute information of a multiview image that may be added to a multiview image coded bitstream.

2 illustrates an example of a configuration of an NAL unit to which attribute information about a multiview image may be added. In general, the NAL unit may include a header of the NAL unit and a raw byte sequence payload (RBSP). The header of the NAL unit may include identification information nal_ref_idc indicating whether the NAL unit includes a slice of the reference picture and information nal_unit_type indicating the type of the NAL unit. In addition, the extended region of the NAL unit header may be limited. For example, when the information indicating the type of the NAL unit is related to scalable video coding or indicates a prefix NAL unit, the NAL unit may also include an extended area of the NAL unit header. As a specific example, when nal_unit_type = 20 or 14, the NAL unit may also include an extended region of the NAL unit header. In addition, in the extension region of the NAL unit header, attribute information of a multiview image may be added according to flag information svc_mvc_flag for identifying whether the MVC bitstream is an MVC bitstream.

Hereinafter, various attribute information about a multiview image, for example, attribute information that may be included in an extended region of a NAL unit header, will be described in detail.

First, view identification information refers to information for distinguishing a picture at a current view from a picture at a different view. When a video image signal is coded, a picture order count (POC) and frame_num are used to identify each picture. In the case of a multiview video image, since inter-view prediction is performed, identification information for distinguishing a picture at a current view from a picture at a different view is required. Therefore, it is necessary to define viewpoint identification information for identifying the viewpoint of the picture. The view identification information may be obtained from a header area of a video signal. For example, the header area may be an NAL header, an extended area of the NAL header, or a slice header. The view identification information may be used to obtain information of a picture that is different from the current picture, and the video signal may be decoded using the information of the picture at the other view.

In addition, the information for identifying the picture in the view direction means a picture identifier for distinguishing pictures existing in the view direction. For example, in order to manage pictures in the decoded picture buffer unit 600, information for identifying a picture in the view direction may be used. In this case, the viewpoint identification information may be used together. POC and frame_num may be used together. As a specific example, information for identifying a picture in the view direction may be used to generate a reference picture list for inter-view prediction. For example, similar to frame_num, information for identifying a picture in a view direction may be defined. That is, the information for identifying the picture in the view direction may be defined based on the decoded order between the pictures in the view direction.

The information identifying the picture in the view direction and the view identification information may be applied throughout the encoding / decoding process of the video signal. For example, the viewpoint identification information may be used to indicate the inter-view dependency. In order to indicate the inter-view dependency, information about the number of interview reference pictures and viewpoint identification information on the interview reference picture may be required. Information used to indicate a viewpoint-dependent relationship, such as the number of interview reference pictures and the view identification information of the interview reference picture, will be referred to as interview reference information. In this case, the viewpoint identification information may be used to indicate viewpoint identification information of the interview reference picture. In addition, information identifying a picture in the view direction may be used to distinguish interview reference pictures. Here, the interview reference picture may mean a reference picture used when performing inter-view prediction with respect to the current picture. In addition, the frame_num may be applied to multi-view video coding as it is, using a frame_num in consideration of a view rather than a specific picture identifier. For example, the frame_num may be used by mapping information identifying a picture in the view direction to an existing frame_num. In addition, the POC may be used by mapping the viewpoint identification information to a POC. This will be described in detail with reference to FIGS. 3 to 5.

Inter-view picture group identification information refers to information for identifying whether a coded picture of a current NAL unit is an interview picture group. The inter-view picture group means an encoded picture in which all slices refer only to slices in frames of the same time zone. For example, an encoded picture refers to only a slice at another viewpoint and no slice at the current viewpoint. In the decoding process of a multiview image, random access between views may be possible. As such, when the interview reference information is acquired based on the interview picture group identification information, random access between viewpoints can be performed more efficiently. This is because the inter-view reference relationship between the pictures in the interview picture group may be different from the inter-view reference relationship in the non-interview picture group. In this case, more efficient random access may be possible by using information identifying a picture in the view direction.

In addition, the interview picture group identification information may be used when generating a reference picture list. In this case, the reference picture list may include a reference picture list for inter-view prediction. The reference picture list for the inter-view prediction may be added to the reference picture list. For example, the interview picture group identification information may be used when initializing a reference picture list or rearranging the reference picture list. It may also be used to manage the added reference pictures for the inter-view prediction. For example, the reference pictures may be divided into an interview picture group and a non-interview picture group, and the reference pictures not used when performing inter-view prediction may be marked not to be used. In addition, the interview picture group identification information may be applied to a hypothetical reference decoder.

Inter-view prediction flag information refers to information indicating whether a coded picture of a current NAL unit is used for inter-view prediction. The interview prediction flag information may be used in a part where temporal prediction or inter-view prediction is performed. In this case, the NAL unit may be used together with identification information indicating whether the NAL unit includes a slice of the reference picture. For example, when the current NAL unit does not include a slice of a reference picture according to the identification information but is used for inter-view prediction, the current NAL unit may be a reference picture used only for inter-view prediction. Alternatively, when the current NAL unit includes a slice of a reference picture according to the identification information and is used for inter-view prediction, the current NAL unit may be used for temporal prediction and inter-view prediction. In addition, even if the NAL unit does not include a slice of the reference picture according to the identification information, it may be stored in the decoded picture buffer. This is because, if the coded picture of the current NAL unit is used for inter-view prediction according to the interview prediction flag information, it needs to be stored. As such, information identifying the picture in the view direction may be used to distinguish interview reference pictures for inter-view prediction.

Hereinafter, embodiments of using information for identifying a picture in the view direction will be described with reference to FIG. 3.

3 illustrates a prediction structure of multi-view video coding to which information identifying a picture in a view direction is applied according to an embodiment to which the present invention is applied.

In video coding, identification information is needed to identify each picture. In addition, information for identifying each picture may be needed to manage the reference picture. For example, frame_num and POC may be defined as information for identifying a picture in the time direction. Here, frame_num may mean a picture number allocated to each picture based on the decoding order. The POC may mean a picture number assigned to each picture based on the picture output order. Meanwhile, view_id and view_num may be defined as information for identifying a picture in the view direction. Here, view_id may mean a view number for identifying a view point of a picture. And, view_num may mean a picture number (or view number) assigned to each picture based on a decoding order or a prediction structure between interview pictures.

As illustrated in FIG. 3, the horizontal axes T0 to T8 represent pictures according to time, and the vertical axes V0 to V4 represent pictures according to viewpoints. For example, pictures in T0 refer to images taken by different cameras in the same time zone T0, and pictures in V0 refer to images in different time zones taken by one camera. In addition, I, P, B, and b on each picture represent picture types of respective pictures, for example, an I picture represents an intra predicted picture and a P picture represents a picture predicted using one reference picture. A B or b picture represents a picture predicted by using pictures of two references. In this case, the b picture may mean an interview predicted picture, and the B picture may mean a reference picture used for interview prediction. However, even if the B picture is an interview picture group (for example, a picture existing in time zones T0, T4, and T8), the picture may be an interview predicted picture.

Taking the picture of FIG. 3 as an example, it will be described how information for identifying the picture can be allocated.

First, when a picture sequence existing at each time point is individually coded, it will be described how frame_num and POC are allocated to pictures in the temporal direction. For example, for pictures at the VO time point, the POC value may be allocated according to the time order T0 to T8. That is, POC values from 0 to 8 may be allocated in the order of TO to T8. Meanwhile, frame_num may be allocated based on the decoding order. For example, an I picture in the TO time zone may be decoded first, followed by an I picture in the T4 time zone, and a B picture in the T2 time zone from the two I pictures. Then, while I pictures in the T8 time zone are decoded, the B pictures in the T1 time zone and the B pictures in the T2 time zone and the I pictures in the T4 time zone can be decoded using the I pictures in the TO time zone and B pictures in the T2 time zone. B pictures in the T3 time zone can be decoded. In this case, frame_num of each picture may be allocated in the above order. That is, frame_num of I picture in TO time zone is 0, frame_num of I picture in T4 time zone is 1, frame_num of B picture in T2 time zone is 2, I picture in T8 time zone, B picture in T1 time zone, and B picture in T3 time zone. frame_num may be assigned a value of all 3. Frame_num values may be assigned to the subsequent pictures in the same manner.

Next, when a picture sequence existing in each time zone is coded, it will be described how view_id and view_num are allocated to pictures in a view direction.

For example, for pictures in the TO time zone, the view_id value may be assigned according to the camera arrangement order V0 to V4. Alternatively, they may be allocated in a predetermined order, or may be allocated arbitrarily. 3 shows an example of allocation according to the camera arrangement order. That is, the view_id value may be allocated from 0 to 4 according to the order of VO to V4 where the cameras are arranged. The view_id may be assigned the same value with respect to pictures taken by the same camera. For example, view_id of pictures at the time point V0 may all have a value of zero.

On the other hand, view_num may be allocated based on the prediction structure. For example, let's look at the inter-view prediction structure of pictures in the time zone T0. The P picture at the time point V2 may be a picture predicted from the I picture in the T0 time zone. The P picture at V4 may be predicted using the P picture at V2, and the B picture at V1 may be predicted using the P picture at V2 and the I picture at V0. In this case, view_num of each picture may be allocated in the above order. That is, the view_num of the I picture at the VO view is 0, the view_num of the P picture at the V2 view is 1, the view_num of the B picture at the V1 view and the view_num of the P picture at the V4 view are both assigned a value of 2. For subsequent pictures, the view_num value may be allocated in the same manner. The view_num may be assigned the same value with respect to pictures taken by the same camera. This is because the prediction structure between viewpoints may be equally applied to each time zone. For example, view_num of pictures at the time point V0 may all have a value of zero.

In another embodiment of the present invention, the reference picture may be managed using information for identifying the picture in the view direction. Hereinafter will be described in detail in FIG.

4 illustrates an internal block diagram of the reference picture list generator 630 according to an embodiment to which the present invention is applied.

As described above, in video coding, identification information is required to identify each picture. In addition, information for identifying each picture may be needed to manage the reference picture. The decoded picture buffer unit 600 may use the variable PicNum to manage the reference pictures. In this case, in order to manage reference pictures for inter-view prediction, information for distinguishing pictures in a view direction may be needed. Accordingly, view_id and view_num, which are information for identifying a picture in the view direction, may be allocated to the variable PicNum. The specific embodiment will be described.

The reference picture list generator 630 may include a variable derivator 631, a reference picture list initializer 635, and a reference picture list rearranger 640.

The variable derivation unit 625 induces variables used to initialize the reference picture list. For example, the variable may be derived using frame_num indicating an identification number of a picture. As a specific example, a variable FrameNum and a variable FrameNumWrap may be used for each short-term reference picture. First, the variable FrameNum is equal to the frame_num value that is a syntax element. The variable FrameNumWrap may be used by the decoded picture buffer unit 600 to allocate a small number for each reference picture, and may be derived from the variable FrameNum. The variable PicNum can be derived using the variable FrameNumWrap thus derived. The variable PicNum may refer to an identification number of a picture used in the decoded picture buffer unit 600. The variable LongTermPicNum may be used when representing a long term reference picture.

In addition, information about a viewpoint may be used to generate a reference picture list for inter-view prediction. For example, a method similar to the process of using frame_num may be applied to view_num. In addition, a method similar to a POC usage process may be applied to view_id.

Alternatively, view_num may be mapped to frame_num, view_id may be mapped to POC, and the first variable PicNum may be derived using frame_num and POC in the conventional manner.

For example, a second variable (for example, ViewNum) may be derived using view_num identifying a picture in the view direction. First, the second variable may be equal to the view_num value that is a syntax element. The third variable (eg, ViewNumWrap) may be used in the decoded picture buffer unit 600 to allocate a small identification number for each reference picture, and may be derived from the second variable.

The reference picture list initialization unit 630 initializes the reference picture list by using the variables. In this case, the initialization process of the reference picture list may vary depending on the slice type. For example, when decoding a P slice, a reference picture number may be assigned based on a decoding order (for example, frame_num), and when decoding a B slice, the picture output order (for example, POC) may be assigned. A reference picture number can be assigned based on this. Similarly, when initializing a reference picture list for inter-view prediction, a number may be assigned to a reference picture based on the first variable, that is, a variable derived from picture identification information identifying a picture in a view direction. Alternatively, in the case of a P slice, a reference picture number may be allocated based on view_num, and in the case of a B slice, a reference picture number may be allocated based on view_id. For example, when the slice type of the current picture is a B slice, the reference picture list may be initialized using the fourth variable ViewId derived from view_id. In this case, the view_id may be a value determined based on the camera arrangement order.

As a specific example, when the slice type of the current picture is a P slice, the short-term reference picture and the long-term reference picture may be arranged based on the decoding order. For example, it may be arranged according to a value of a variable (PicNum or ViewNum) derived from a value (eg, view_num) indicating an identification number of a picture in a view direction. First, the short-term reference pictures may be initialized prior to the long-term reference picture. The order in which the short-term reference pictures are arranged may be arranged in the order of the reference picture having the highest variable value (PicNum or ViewNum) among the reference pictures from the reference picture having the lowest variable value. The order in which the long-term reference pictures are arranged may be arranged in the order of the reference picture having the lowest variable value from the reference picture and the reference picture having the highest variable value. However, in the case of a reference picture list for inter-view prediction, a long-term reference picture may not exist.

In addition, when the slice type of the current picture is a B slice, it may be arranged based on the fourth variable ViewId derived using the view identification information view_id. Alternatively, the view_id may be mapped to a POC and arranged using the POC. For example, in the case of reference picture list 0 for inter-view prediction, the reference picture having the lowest fourth variable value from the reference picture having the highest fourth variable value among the reference pictures having the fourth variable value lower than the current picture is used. Can be arranged in order. The reference picture having the fourth variable value among the reference pictures having the fourth variable value higher than the current picture may be arranged in the order of the reference picture having the highest fourth variable value.

In the case of the reference picture list 1 for inter-view prediction, the reference picture having the lowest fourth variable value among the reference pictures having the fourth variable value higher than the current picture starts from the reference picture having the highest fourth variable value. Can be arranged. The reference picture having the fourth variable value among the reference pictures having the fourth variable value lower than the current picture may be arranged in the order of the reference picture having the lowest fourth variable value.

The reference picture list rearranger 640 improves the compression ratio by allocating a smaller number to a picture frequently referenced in the initialized reference picture list. The reference picture number for designating the reference picture is encoded in units of blocks because a smaller number of bits is assigned as the reference picture number for encoding the reference picture number is smaller.

As described above, the decoding / encoding device to which the present invention is applied may be provided in a multimedia broadcasting transmission / reception device such as digital multimedia broadcasting (DMB), and may be used to decode a video signal and a data signal. In addition, the multimedia broadcasting transmission / reception apparatus may include a mobile communication terminal.

In addition, the decoding / encoding method to which the present invention is applied may be stored in a computer-readable recording medium that is produced as a program for execution on a computer, and multimedia data having a data structure according to the present invention may also be read by a computer. It can be stored in the recording medium. The computer readable recording medium includes all kinds of storage devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. In addition, the bitstream generated by the encoding method may be stored in a computer-readable recording medium or transmitted using a wired / wireless communication network.

As mentioned above, preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

1 is a schematic block diagram of a video signal decoding apparatus to which the present invention is applied.

2 is an embodiment to which the present invention is applied and shows attribute information of a multiview image that may be added to a multiview image coded bitstream.

3 illustrates a prediction structure of multi-view video coding to which information identifying a picture in a view direction is applied according to an embodiment to which the present invention is applied.

4 illustrates an internal block diagram of the reference picture list generator 630 according to an embodiment to which the present invention is applied.

Claims (14)

Obtaining picture identification information for identifying a picture in a view direction; Deriving a first variable for generating a reference picture list for inter-view prediction using the picture identification information; And Generating a reference picture list for the inter-view prediction using the first variable Video signal decoding method comprising a. The method of claim 1, wherein the deriving of the first variable comprises: And a second variable set from the picture identification information and a third variable derived from the second variable. The method of claim 2, The method may further include initializing a reference picture list for the inter-view prediction. The reference picture list for the inter-view prediction is arranged based on the first variable. The method of claim 3, wherein Obtaining a slice type of the current picture, When the slice type is a P / SP slice, the reference picture list 0 for inter-view prediction is generated using the first variable, and the reference picture list 0 for the inter-view prediction is the highest first variable among the reference pictures. And a picture ordered from the reference picture having the lowest first variable to the picture having the lowest first variable. The method of claim 1, And the picture identification information is determined based on a decoding order between interview pictures. The method of claim 1, Obtaining viewpoint information identifying a viewpoint of a current picture; Obtaining a slice type of the current picture; And If the slice type is a B slice, initializing a reference picture list for the inter-view prediction using a fourth variable derived from the view information The video signal decoding method further comprising. The method of claim 6, When the slice type is a B slice, a reference picture list 0 for inter-view prediction is generated using the fourth variable, and the reference view list 0 for inter-view prediction is lower than a fourth variable of the current picture. The reference pictures having the highest fourth variable are arranged in the order of the reference pictures having the lowest fourth variable, and then the highest fourth variable is selected starting from the reference picture having the lowest fourth variable that is higher than the fourth variable of the current picture. And a video signal decoding method arranged in a reference picture order. The method of claim 6, When the slice type is a B slice, the reference picture list 1 for inter-view prediction is generated using the fourth variable, and the reference view list 1 for the inter-view prediction is higher than the fourth variable of the current picture and is the lowest. The reference pictures having the fourth variable are arranged in the order of the reference pictures having the highest fourth variable, and then the lowest fourth variable starting from the reference picture having the highest fourth variable lower than the fourth variable of the current picture is ordered. And a video signal decoding method arranged in a reference picture order. The method of claim 6, The viewpoint information is determined based on the camera arrangement order. Obtaining viewpoint information identifying a viewpoint of a current picture; Obtaining a slice type of the current picture; And Deriving picture identification information identifying a picture in a view direction based on the view information and the slice type Generating a reference picture list using the derived picture identification information Video signal decoding method comprising a. The method according to claim 1 or 10, And the video signal is received as a broadcast signal. The method according to claim 1 or 10, And the video signal is received through digital medium. A computer readable medium having recorded thereon a program for executing the method according to claim 1. A variable deriving unit for deriving a variable for generating a reference picture list for inter-view prediction using picture identification information for identifying a picture in a view direction; A reference picture list generator for generating a reference picture list for the inter-view prediction using the variable Video signal decoding apparatus comprising a.

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