US20090225826A1 - Multi-View Video Coding Method and Device - Google Patents

Multi-View Video Coding Method and Device Download PDF

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US20090225826A1
US20090225826A1 US12/224,816 US22481607A US2009225826A1 US 20090225826 A1 US20090225826 A1 US 20090225826A1 US 22481607 A US22481607 A US 22481607A US 2009225826 A1 US2009225826 A1 US 2009225826A1
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view
views
syntax element
specific information
syntax
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Purvin Bibhas Pandit
Yeping Su
Peng Yin
Cristina Gomila
Jill MacDonald Boyce
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/577—Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/107—Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/136—Incoming video signal characteristics or properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards

Definitions

  • the present principles relate generally to video encoding and decoding and, more particularly, to methods and apparatus for use in a multi-view video coding system.
  • Multi-view Video Coding MVC
  • ISO/IEC International Organization for Standardization/International Electrotechnical Commission
  • MPEG-4 MPEG-4 Part 10 Advanced Video Coding
  • ITU-T Telecommunication Sector
  • MPEG-4 AVC standard Multi-view Video Coding
  • a method has been proposed to enable efficient random access in multi-view compressed bit streams.
  • a V-picture type and a View Dependency Supplemental Enhancement Information (SEI) message are defined.
  • SEI View Dependency Supplemental Enhancement Information
  • a feature required in the proposed V-picture type is that V-pictures shall have no temporal dependence on other pictures in the same camera and may only be predicted from pictures in other cameras at the same time.
  • the proposed View Dependency Supplemental Enhancement Information message will describe exactly which views a V-picture, as well as the preceding and following sequences of pictures, may depend on. The following are the details of the proposed changes.
  • V-Picture syntax and semantics a particular syntax table relating to the MPEG-4 AVC standard is extended to include a Network Abstraction Layer (NAL) unit type of 14 corresponding to a V-picture. Also, the V-picture type is defined to have the following semantics:
  • NAL Network Abstraction Layer
  • V-picture A coded picture in which all slices reference only slices with the same temporal index (i.e., only slices in other views and not slices in the current view). When a V-picture would be output or displayed, it also causes the decoding process to mark all pictures from the same view which are not IDR-pictures or V-pictures and which precede the V-picture in output order to be marked as “unused for reference”. Each V-picture shall be associated with a View Dependency SEI message occurring in the same NAL.
  • a View Dependency Supplemental Enhancement Information message is defined with the following syntax:
  • view_dependency ( payloadSize ) ⁇ num_seq_reference_views ue(v) seq_reference_view_0 ue(v) seq_reference_view_1 ue(v) ... seq_reference_view_N ue(v) num_pic_reference_views ue(v) pic_reference_view_0 ue(v) pic_reference_view_1 ue(v) ...
  • num_seq_reference_views/num_pic_reference_views denotes the number of potential views that can be used as a reference for the current sequence/picture
  • seq_reference_view_i/pic_reference_view_i denotes the view number for the i th reference view.
  • the picture associated with a View Dependency Supplemental Enhancement Information message shall only reference the specified views described by pic_reference_view_i. Similarly, all subsequent pictures in output order of that view until the next View Dependency Supplemental Enhancement Information message in that view shall only reference the specified views described by seq_reference_view_i.
  • a View Dependency Supplemental Enhancement Information message shall be associated with each Instantaneous Decoding Refresh (IDR) picture and V-picture.
  • At least one drawback of this method is the complexity introduced in the decoder due to the dependency being recursively obtained. Additionally, this method requires that every V-picture carry an SEI message (which is a non-normative part of the MPEG-4 AVC standard), resulting in the dependency being unable to be used for normative behavior such as reference picture selection.
  • an apparatus includes an encoder for encoding at least two views corresponding to multi-view video content into a resultant bitstream, wherein the resultant bitstream is encoded to include view specific information.
  • the view specific information indicates a decoding interdependency between at least some of the at least two views.
  • the method includes encoding at least two views corresponding to multi-view video content into a resultant bitstream, wherein the resultant bitstream is encoded to include view specific information.
  • the view specific information indicates a decoding interdependency between at least some of the at least two views.
  • an apparatus includes a decoder for decoding at least two views corresponding to multi-view video content from a bitstream, wherein the bitstream is decoded to determine view specific information included therein, the view specific information indicating a decoding interdependency between at least some of the at least two views.
  • the method includes decoding at least two views corresponding to multi-view video content from a bitstream, wherein the bitstream is decoded to determine view specific information included therein.
  • the view specific information indicates a decoding interdependency between at least some of the at least two views.
  • an apparatus includes an encoder for encoding at least two views corresponding to multi-view video content by defining as a base view any of the at least two views that, for a decoding thereof, is independent of any other of the at least two views.
  • the method includes encoding at least two views corresponding to multi-view video content by defining as a base view any of the at least two views that, for a decoding thereof, is independent of any other of the at least two views.
  • an apparatus includes a decoder for decoding at least two views corresponding to multi-view video content, wherein the decoder determines which, if any, of the at least two views is a base view that, for a decoding thereof, is independent of any other of the at least two views.
  • the method includes decoding at least two views corresponding to multi-view video content, wherein the decoding step determines which, if any, of the at least two views is a base view that, for a decoding thereof, is independent of any other of the at least two views.
  • an apparatus includes an encoder for encoding at least two views corresponding to multi-view video content by encoding at least one of the at least two views in a resultant bitstream that is syntax compliant with the International Organization for Standardization/International Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/international Telecommunication Union, Telecommunication Sector H.264 recommendation, for backwards compatibility therewith.
  • the method includes encoding at least two views corresponding to multi-view video content by encoding at least one of the at least two views in a resultant bitstream that is syntax compliant with the International Organization for Standardization/International Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/International Telecommunication Union, Telecommunication Sector H.264 recommendation, for backwards compatibility therewith.
  • an apparatus includes a decoder for decoding at least two views corresponding to multi-view video content, wherein at least one of the at least two views is included in a bitstream that is syntax compliant with the International Organization for Standardization/international Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/International Telecommunication Union, Telecommunication Sector H.264 recommendation, for backwards compatibility therewith.
  • the method includes decoding at least two views corresponding to multi-view video content, wherein at least one of the at least two views is included in a bitstream that is syntax compliant with the International Organization for Standardization/International Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/International Telecommunication Union, Telecommunication Sector H.264 recommendation, for backwards compatibility therewith.
  • an apparatus includes an encoder for encoding at least one of at least two views corresponding to multi-view video content by selecting between one of two-pre-defined slice types.
  • the method includes encoding at least one of at least two views corresponding to multi-view video content by selecting between one of two-pre-defined slice types.
  • an apparatus includes a decoder for decoding at least one of at least two views corresponding to multi-view video content by determining between one of two-pre-defined slice types.
  • the method includes decoding at least one of at least two views corresponding to multi-view video content by determining between one of two-pre-defined slice types.
  • an apparatus includes an encoder for encoding at least two views corresponding to multi-view content into a resultant bitstream, wherein the resultant bitstream is encoded to include at least one camera parameter corresponding to at least one of the at least two views.
  • the method includes encoding at least two views corresponding to multi-view content into a resultant bitstream, wherein the resultant bitstream is encoded to include at least one camera parameter corresponding to at least one of the at least two views.
  • an apparatus includes a decoder for decoding at least two views corresponding to multi-view content from a bitstream, wherein the bitstream is decoded to determine at least one camera parameter included therein.
  • the at least one camera parameter corresponds to at least one of the at least two views.
  • the method includes decoding at least two views corresponding to multi-view content from a bitstream, wherein the bitstream is decoded to deter mine at least one camera parameter included therein.
  • the at least one camera parameter corresponds to at least one of the at least two views.
  • an apparatus includes an encoder for encoding at least two views corresponding to multi-view video content into a resultant bitstream, wherein the resultant bitstream is encoded to include at least one syntax element related to at least one camera parameter for at least one of the at least two views.
  • the method includes encoding at least two views corresponding to multi-view video content into a resultant bitstream, wherein the resultant bitstream is encoded to include at least one syntax element related to at least one camera parameter for at least one of the at least two views.
  • an apparatus includes a decoder for decoding at least two views corresponding to multi-view video content from a bitstream, wherein the bitstream is decoded to determine at least one camera parameter for at least one of the at least two views based on at least one syntax element included in the bitstream.
  • the method includes decoding at least two views corresponding to multi-view video content from a bitstream, wherein the bitstream is decoded to determine at least one camera parameter for at least one of the at least two views based on at least one syntax element included in the bitstream.
  • FIG. 1 is a block diagram for an exemplary video encoder to which the present principles may be applied, in accordance with an embodiment of the present principles
  • FIG. 2 is a block diagram for an exemplary video decoder to which the present principles may be applied, in accordance with an embodiment of the present principles;
  • FIG. 3 is a diagram for an inter-view-temporal prediction structure based on the MPEG-4 AVC standard, using hierarchical B pictures, in accordance with an embodiment of the present principles
  • FIG. 4 is a flow diagram for an exemplary method for encoding multiple views of multi-view video content, in accordance with an embodiment of the present principles.
  • FIG. 5 is a flow diagram for an exemplary method for decoding multiple views of multi-view video content, in accordance with an embodiment of the present principles.
  • the present principles are directed to methods and apparatus for use in a multi-view video coding system.
  • processor or “controller” should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor (“DSP”) hardware, read-only memory (“ROM”) for storing software, random access memory (“RAM”), and non-volatile storage.
  • DSP digital signal processor
  • ROM read-only memory
  • RAM random access memory
  • any switches shown in the figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the implementer as more specifically understood from the context.
  • any element expressed as a means for performing a specified function is intended to encompass any way of performing that function including, for example, a) a combination of circuit elements that performs that function or b) software in any form, including, therefore, firmware, microcode or the like, combined with appropriate circuitry for executing that software to perform the function.
  • the present principles as defined by such claims reside in the fact that the functionalities provided by the various recited means are combined and brought together in the manner which the claims call for. It is thus regarded that any means that can provide those functionalities are equivalent to those shown herein.
  • FIG. 1 an exemplary video encoder to which the present principles may be applied is indicated generally by the reference numeral 100 .
  • An input to the video encoder 100 is connected in signal communication with a non-inverting input of a combiner 110 .
  • the output of the combiner 110 is connected in signal communication with a transformer/quantizer 120 .
  • the output of the transformer/quantizer 120 is connected in signal communication with an entropy coder 140 .
  • An output of the entropy coder 140 is available as an output of the encoder 100 .
  • the output of the transformer/quantizer 120 is further connected in signal communication with an inverse transformer/quantizer 150 .
  • An output of the inverse transformer/quantizer 150 is connected in signal communication with an input of a deblock filter 160 .
  • An output of the deblock filter 160 is connected in signal communication with reference picture stores 170 .
  • a first output of the reference picture stores 170 is connected in signal communication with a first input of a motion estimator 180 .
  • the input to the encoder 100 is further connected in signal communication with a second input of the motion estimator 180 .
  • the output of the motion estimator 180 is connected in signal communication with a first input of a motion compensator 190 .
  • a second output of the reference picture stores 170 is connected in signal communication with a second input of the motion compensator 190 .
  • the output of the motion compensator 190 is connected in signal communication with an inverting input of the combiner 110 .
  • FIG. 2 an exemplary video decoder to which the present principles may be applied is indicated generally by the reference numeral 200 .
  • the video decoder 200 includes an entropy decoder 210 for receiving a video sequence.
  • a first output of the entropy decoder 210 is connected in signal communication with an input of an inverse quantizer/transformer 220 .
  • An output of the inverse quantizer/transformer 220 is connected in signal communication with a first non-inverting input of a combiner 240 .
  • the output of the combiner 240 is connected in signal communication with an input of a deblock filter 290 .
  • An output of the deblock filter 290 is connected in signal communication with an input of a reference picture stores 250 .
  • the output of the reference picture stores 250 is connected in signal communication with a first input of a motion compensator 260 .
  • An output of the motion compensator 260 is connected in signal communication with a second non-inverting input of the combiner 240 .
  • a second output of the entropy decoder 210 is connected in signal communication with a second input of the motion compensator 260 .
  • the output of the deblock filter 290 is available as an output of the video decoder 200 .
  • a high level syntax is proposed for efficient processing of a multi-view sequence.
  • VPS View Parameter Set
  • the NAL unit types including a view identifier (id) in the NAL header to identify to which view the slice belongs.
  • view identifier id
  • high level syntax refers to syntax present in the bitstream that resides hierarchically above the macroblock layer.
  • high level syntax may refer to, but is not limited to, syntax at the slice header level, Supplemental Enhancement Information (SEI) level, picture parameter set level, and sequence parameter set level.
  • SEI Supplemental Enhancement Information
  • a base view may or may not be compatible with the MPEG-4 AVC standard, but an MPEG-4 AVC compatible view is always a base view.
  • an inter-view-temporal prediction structure based on the MPEG-4 AVC standard, using hierarchical B pictures is indicated generally by the reference numeral 300 .
  • the variable I denotes an intra coded picture
  • the variable P denotes a predictively coded picture
  • the variable B denotes a bi-predictively coded picture
  • the variable T denotes a location of a particular picture
  • the variable S denotes a particular view to which corresponds a particular picture.
  • Anchor picture is defined as a picture the decoding of which does not involve any picture sampled at a different time instance.
  • An anchor picture is signaled by setting the nal_ref_idc to 3.
  • all pictures in locations T 0 , T 8 . . . , T 96 , and T 100 are examples of anchor pictures.
  • Non-anchor picture is defined as a picture which does not have the above constraint specified for an anchor picture.
  • pictures B 2 , B 3 , and B 4 are non-anchor pictures.
  • Base view is a view which does not depend on any other view and can be independently decoded.
  • view S 0 is an example of base view.
  • a new parameter set is proposed called the View Parameter Set with its own NAL unit type and two new NAL unit types to support Multi-view Video Coding slices.
  • the MPEG-4 AVC standard includes the following two parameter sets: (1) Sequence Parameter Set (SPS), which includes information that is not expected to change over an entire sequence; and (2) Picture Parameter Set (PPS), which includes information that is not expected to change for each picture.
  • SPS Sequence Parameter Set
  • PPS Picture Parameter Set
  • Multi-view Video Coding has additional information which is specific to each view, we have created a separate View Parameter Set (VPS) in order to transmit this information. All the information that is needed to determine the dependency between the different views is indicated in the View Parameter Set.
  • the syntax table for the proposed View Parameter Set is shown in TABLE 1 (View Parameter Set RBSP syntax). This View Parameter Set is included in a new NAL unit type, for example, type 14 as shown in TABLE 2 (NAL unit type codes).
  • view_parameter_set_id identifies the view parameter set that is referred to in the slice header.
  • the value of the view_parameter_set_id shall be in the range of 0 to 255.
  • number_of_views_minus — 1 plus 1 identifies the total number of views in the bitstream.
  • the value of the number_of_view_minus — 1 shall be in the range of 0 to 255.
  • avc_compatible_view_id indicates the view_id of the AVC compatible view.
  • the value of avc_compatible_view_id shall be in the range of 0 to 255.
  • is_base_view_flag[i] 1 indicates that the view i is a base view and is independently decodable is_base_view_flag[i] equal to 0 indicates that the view i is not a base view.
  • the value of is_base_view_flag[i] shall be equal to 1 for an AVC compatible view i.
  • dependency_update_flag 1 indicates that dependency information for this view is updated in the VPS.
  • dependency_update_flag 0 indicates that the dependency information for this view is not updated and should not be changed.
  • anchor_picture_dependency_maps[i][j] 1 indicates the anchor pictures with view_id equal to j will depend on the anchor pictures with view_id equal to i.
  • non_anchor_picture_dependency_maps[i][j] 1 indicates the non-anchor pictures with view_id equal to j will depend on the non-anchor pictures with view_id equal to i.
  • non_anchor_picture_dependency_maps[i][j] is present only when anchor_picture_dependency_maps[i][j] equals 1. If anchor_picture_dependency_maps[i][j] is present and is equal to zero non_anchor_picture_dependency_maps[i][j] shall be inferred as being equal to 0.
  • Optional parameters in the View Parameter Set include the following:
  • camera_parameters_present_flag 1 indicates that a projection matrix is signaled as follows.
  • camera_parameters presuming camera parameter is conveyed in the form of a 3 ⁇ 4 projection matrix P, which can be used to map a point in the 3D world to the 2D image coordinate:
  • Each element camera_parameters_*_* can be represented according to the IEEE single precision floating point (32 bits) standard.
  • the decoder can create a map using all the dependency information once it receives the View Parameter Set. This enables it to know before it receives any slice which views are needed for decoding a particular view. As a result of this, we only need to parse the slice header to obtain the view_id and determine if this view is needed to decode a target view as indicated by a user. Thus, we do not need to buffer any frames or wait until a certain point to determine which frames are needed for decoding a particular view.
  • the dependency information and whether it is a base view is indicated in the View Parameter Set. Even an MPEG-4 AVC compatible base view has associated with it information that is specific to that view (e.g., camera parameters). This information may be used by other views for several purposes including view interpolation/synthesis.
  • Non-Multi-view Video Coding decoder By restricting it to just one such view, it is guaranteed that a non-Multi-view Video Coding decoder will be able to correctly decode the view and a Multi-view Video Coding decoder can easily identify such a view from the View Parameter Set using the syntax avc_compatible_view_id. All other base views (non-MPEG-4 AVC compatible) can be identified using the is_base_view_flag.
  • a new slice header for Multi-view Video Coding slices is proposed.
  • the View Parameter Set is identified using the view_parameter_set_id.
  • the view_id information is needed for several Multi-view Video Coding requirements including view interpolation/synthesis, view random access, parallel processing, and so forth. This information can also be useful for special coding modes that only relate to cross-view prediction.
  • view_parameter_set_id specifies the view parameter set in use.
  • the value of the view_parameter_set_id shall be in the range 0 to 255.
  • view_id indicates the view id of the current view.
  • the value of the view_parameter_set_id shall be in the range 0 to 255.
  • View random access is a Multi-view Video Coding requirement. The goal is to get access to any view with minimum decoding effort. Let us consider a simple example of view random access for the prediction structure shown in FIG. 3 .
  • view_id for the views are numbered consecutively from 0 to 7 in the slice header syntax and there is only one View Parameter Set present with view_parameter_set equal to 0. number_of_views_minus — 1 is set to 7. avc_compatible_view_id could be set to 0.
  • is_base_view_flag is set to 1 and for other views it is set to 0.
  • the dependency map for S 0 , S 1 , S 2 , S 3 , and S 4 will look as shown in TABLE 4A (Dependency table for S 0 anchor_picture_dependency_map) and TABLE 4B (dependency table for S 0 non_anchor_picture_dependency_map).
  • the dependency map for the other views can be written in a similar way.
  • the decoder can easily determine if a slice it receives is needed to decode a particular view.
  • the decoder only needs to parse the slice header to determine the view_id of the current slice and for the target view S 3 it can look up the S 3 columns in the two tables (TABLE 4a and TABLE 4B) to determine whether or not it should keep the current slice.
  • the decoder needs to distinguish between anchor pictures and non-anchor pictures since they may have different dependencies as can be seen from TABLE 4a and TABLE 4b.
  • For the target view S 3 we need to decode the anchor pictures of views S 0 , S 2 , and S 4 but only need to decode the non-anchor pictures of views S 2 and S 4 .
  • FIG. 4 an exemplary method for encoding multiple views of multi-view video content is indicated generally by the reference numeral 400 .
  • the method 400 includes a start block 405 that passes control to a function block 410 .
  • the function block 410 reads a configuration file for the encoding parameters to be used to encode the multiple views, and passes control to a function block 415 .
  • the function block sets N to be equal to the number of views to be encoded, and passes control to a function block 420 .
  • the function block 420 sets number_of_views_minus — 1 equal to N ⁇ 1, sets avc_compatible_view_id equal to the view_id of the MPEG-4 AVC compatible view, and passes control to a function block 425 .
  • the function block 425 sets view_parameter_set_id equal to a valid integer, initializes a variable i to be equal to zero, and passes control to a decision block 430 .
  • the decision block 430 determines whether or not i is greater than N. If so, then control is passed to a decision block 435 . Otherwise, control is passed to a function block 470 .
  • the decision block 435 determines whether or not the current view is a base view. If so, then control is passed to a function block 440 . Otherwise, control is passed to a function block 480 .
  • the function block 440 sets is_base_view_flag[i] equal to one, and passes control to a decision block 445 .
  • the decision block 445 determines whether or not the dependency is being updated. If so, the control is passed to a function block 450 . Otherwise, control is passed to a function block 485 .
  • the function block 450 sets dependency_update_flag equal to one, and passes control to a function block 455 .
  • the function block 455 sets a variable j equal to 0, and passes control to a decision block 460 .
  • the decision block 460 determines whether or not j is less than N. If so, then control is passed to a function block 465 . Otherwise, control is passed to the function block 487 .
  • the function block 465 sets anchor_picture_dependency_maps[i][j] and non_anchor_picture_dependency_maps[i][j] to values indicated by configuration file, and passes control to a function block 467 .
  • the function block 467 increments the variable j by one, and returns control to the decision block 460 .
  • the function block 470 sets camera_parameters_present_flag equal to one when camera parameters are present, sets camera_parameters_present_flag equal to zero otherwise, and passes control to a decision block 472 .
  • the decision block 472 determines whether or not camera_parameters_present_flag is equal to one. If so, then control is passed to a function block 432 . Otherwise, control is passed to a function block 434 .
  • the function block 432 writes the camera parameters, and passes control to the function block 434 .
  • the function block 434 writes the View Parameter Set (VPS) or the Sequence Parameter Set (SPS), and passes control to an end block 499 .
  • VPS View Parameter Set
  • SPS Sequence Parameter Set
  • the function block 480 sets is_base_view_flag[i] equal to zero, and passes control to the decision block 445 .
  • the function block 485 sets dependency_update_flag equal to zero, and passes control to a function block 487 .
  • the function block 487 increments the variable i by 1, and returns control to the decision block 430 .
  • an exemplary method for decoding multiple views of multi-view video content is indicated generally by the reference numeral 500 .
  • the method 500 includes a start block 505 that passes control to a function block 510 .
  • the function block 510 parses a Sequence Parameter Set (SPS) or View Parameter Set (VPS), view_parameter_set_id, number_of_views_minus — 1, avc_compatible_view_id, sets variables I and j equal to zero, sets N equal to number_of_views_minus — 1, and passes control to a decision block 515 .
  • the decision block 515 determines whether or not i is less than or equal to N. If so, then control is passed to a function block 570 . Otherwise, control is passed to a function block 525 .
  • the function block 570 parses camera_parameters_present_flag, and passes control to a decision block 572 .
  • the decision block 572 determines whether or not camera_parameters_present_flag is equal to one. If so, then control is passed to a function block 574 . Otherwise, control is passed to a function block 576 .
  • the function block 574 parses the camera parameters, and passes control to the function block 576 .
  • the function block 576 continues decoding, and passes control to an end block 599 .
  • the function block 525 parses is_base_view_flag[i] and dependency_update_flag, and passes control to a decision block 530 .
  • the decision block 530 determines whether or not dependency_update_flag is equal to zero. If so, then control is passes to a function block 532 . Otherwise, control is passed to a decision block 535 .
  • the function block 532 increments i by one, and returns control to the decision block 515 .
  • the decision block 535 determines whether or not j is less than or equal to N. If so, then control is passed to a function block 540 . Otherwise, control is passes to a function block 537 .
  • the function block 540 parses anchor_picture_dependency_maps[i][j], and passes control to a decision block 545 .
  • the decision block 545 determines whether or not non_anchor_picture_dependency_maps[i][j] is equal to one. If so, then control is passed to a function block 550 . Otherwise, control is passes to a function block 547 .
  • the function block 550 parses the non_anchor_picture_dependency_maps[i][j], and passes control to the function block 547 .
  • the function block 547 increments j by one, and returns control to the decision block 535 .
  • the function block 537 increments i by one, and returns control to the function block 515 .
  • one advantage/feature is an apparatus that includes an encoder for encoding at least two views corresponding to multi-view video content into a resultant bitstream, wherein the resultant bitstream is encoded to include view specific information.
  • the view specific information indicates a decoding interdependency between at least some of the at least two views.
  • Another advantage/feature is the apparatus having the encoder as described above, wherein the decoding interdependency allows a corresponding decoding of at least one of the at least two views using only a subset of the at least two views for the corresponding decoding.
  • Yet another advantage/feature is the apparatus having the encoder as described above, wherein the decoding interdependency indicated in the view specific information is used for random access of at least one of the at least two views by dropping slices related to any other ones of the at least two views indicated as non-interdependent with respect to the at least one view. Still another advantage/feature is the apparatus having the encoder as described above, wherein the view specific information is included in a high level syntax. A further advantage/feature is the apparatus having the encoder as described above, wherein the view specific information is included in a parameter set compliant with the International Organization for Standardization/international Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/international Telecommunication Union, Telecommunication Sector H.264 recommendation.
  • a yet further advantage/feature is the apparatus having the encoder as described above, wherein the view specific information is included in a View Parameter Set.
  • a still further advantage/feature is the apparatus having the encoder wherein the view specific information is included in a View Parameter Set as described above, wherein the View Parameter Set is assigned a NAL unit type specifically for use only with the View Parameter Set.
  • An additional advantage/feature is the apparatus having the encoder wherein a NAL unit type is assigned specifically for use only with the View Parameter Set as described above, wherein the NAL unit type is 14.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the view specific information includes at least one syntax element for indicating a View Parameter Set id.
  • another advantage/feature is the apparatus having the encoder wherein the view specific information includes at least one syntax element for indicating a View Parameter Set id as described above, wherein the at least one syntax element is denoted by a view_parameter_set_id syntax element. Also, another advantage/feature is the apparatus having the encoder as described above, wherein the view specific information includes at least one syntax element for indicating a number of views. Additionally, another advantage/feature is the apparatus having the encoder wherein the view specific information includes at least one syntax element for indicating a number of views as described above, wherein the at least one syntax element is denoted by a number_of_views_minus — 1 syntax element.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the view specific information includes at least one syntax element for indicating a view id for a particular one of the at least two views, when the particular one of the at least two views is encoded in a resultant bitstream that is compliant with the International Organization for Standardization/International Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/international Telecommunication Union, Telecommunication Sector H.264 recommendation.
  • the view specific information includes at least one syntax element for indicating a view id for a particular one of the at least two views as described above, wherein the at least one syntax element is de noted by an avc_compatible_view_id syntax element.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the view specific information includes at least one syntax element or is implicitly derivable from a high level syntax, the at least one syntax element and the high level syntax for indicating that a particular one of the at least two views is compatible with the International Organization for Standardization/international Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/International Telecommunication Union, Telecommunication Sector H.264 recommendation. Additionally, another advantage/feature is the apparatus having the encoder wherein the view specific information includes at least one syntax element or is implicitly derivable from a high level syntax as described above, wherein the at least one syntax element is denoted by an is_base_view_flag syntax element.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the view specific information includes at least one syntax element for indicating whether dependency information for at least one of the at least two views is present in the resultant bitstream. Further, another advantage/feature is the apparatus having the encoder wherein the view specific information includes at least one syntax element for indicating whether dependency information for at least one of the at least two views is present in the resultant bitstream as described above, wherein the at least one syntax element is denoted by a dependency_update_flag syntax element.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the view specific information includes at least one syntax element for indicating whether at least one anchor picture in a current one of the at least two views is used for decoding any other ones of the at least two views.
  • the view specific information includes at least one syntax element for indicating whether at least one anchor picture in a current one of the at least two views is used for decoding any other ones of the at least two views as described above, wherein the at least one syntax element is denoted by an anchor_picture_dependency_maps[i][j] syntax element.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the view specific information includes at least one syntax element for indicating whether at least one non-anchor picture in a current one of the at least two views is used for decoding any other ones of the at least two views. Additionally, another advantage/feature is the apparatus having the encoder wherein the view specific information includes at least one syntax element for indicating whether at least one non-anchor picture in a current one of the at least two views is used for decoding any other ones of the at least two views as described above, wherein the at least one syntax element is denoted by a non_anchor_picture_dependency_maps[i][j] syntax element.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the resultant bitstream is encoded to include at least one syntax element related to at least one camera parameter for at least one of the at least two views. Further, another advantage/feature is the apparatus having the encoder wherein the resultant bitstream is encoded to include at least one syntax element related to at least one camera parameter for at least one of the at least two views as described above, wherein the at least one syntax is included in a parameter set corresponding to the resultant bitstream.
  • another advantage/feature is an apparatus that includes an encoder for encoding at least two views corresponding to multi-view video content by defining as a base view any of the at least two views that, for a decoding thereof, is independent of any other of the at least two views.
  • another advantage/feature is an apparatus that includes an encoder for encoding at least two views corresponding to multi-view video content by encoding at least one of the at least two views in a resultant bitstream that is syntax compliant with the International Organization for Standardization/International Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/International Telecommunication Union, Telecommunication Sector H.264 recommendation, for backwards compatibility therewith.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the at least one view is a base view that, for a decoding thereof, is independent of any other of the at least two views.
  • an avc_compatible_view_id syntax element identifies the at least one view as being encoded in the resultant bitstream that is syntax compliant with the International Organization for Standardization/international Electrotechnical Commission Moving Picture Experts Group-4 Part 10 Advanced Video Coding standard/International Telecommunication Union, Telecommunication Sector H.264 recommendation for backwards compatibility.
  • another advantage/feature is an apparatus that includes an encoder for encoding at least one of at least two views corresponding to multi-view video content by selecting between one of two-pre-defined slice types. Further, another advantage/feature is the apparatus having the encoder as described above, wherein the two pre-defined slice types are an Instantaneous Decoding Refresh slice type and a non-Instantaneous Decoding Refresh slice type.
  • another advantage/feature is the apparatus having the encoder that selects between the Instantaneous Decoding Refresh slice type and the non-Instantaneous Decoding Refresh slice type as described above, wherein NAL unit type 22 is used for the Instantaneous Decoding Refresh slice type and NAL unit type 23 is used for the non-Instantaneous Decoding Refresh slices.
  • another advantage/feature is the apparatus having the encoder as described above, wherein slice headers for at least one of the at least two slices includes view specific syntax.
  • another advantage/feature is the apparatus having the encoder wherein slice headers for at least one of the at least two slices includes view specific syntax as described above, wherein the view specific syntax is conditioned on NAL unit type 23 and NAL unit type 24 .
  • another advantage/feature is the apparatus having the encoder wherein slice headers for at least one of the at least two slices includes view specific syntax as described above, wherein the view specific syntax includes a view parameter set identifier and a view identifier. Also, another advantage/feature is the apparatus having the encoder wherein the view specific syntax includes a view parameter set identifier and a view identifier as described above, wherein the view parameter set identifier is denoted by a view_parameter_set_id syntax element and the view identifier is denoted by a view_id syntax element.
  • another advantage/feature is an apparatus that includes an encoder for encoding at least two views corresponding to multi-view content into a resultant bitstream, wherein the resultant bitstream is encoded to include at least one camera parameter corresponding to at least one of the at least two views.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the resultant bitstream is encoded to include a View Parameter Set, and the at least one camera parameter is included in the View Parameter Set.
  • another advantage/feature is the apparatus having the encoder as described above, wherein a presence of the at least one camera parameter is indicated by a syntax element.
  • another advantage/feature is the apparatus having the encoder wherein a presence of the at least one camera parameter is indicated by a syntax element as described above, wherein the syntax element is a camera_parameters_present_flag syntax element. Additionally, another advantage/feature is the apparatus having the encoder as described above, wherein the at least one camera parameter is denoted by a camera_parameters syntax element.
  • another advantage/feature is an apparatus that includes an encoder for encoding at least two views corresponding to multi-view video content into a resultant bitstream, wherein the resultant bitstream is encoded to include at least one syntax element related to at least one camera parameter for at least one of the at least two views.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the at least one syntax is a high level syntax element.
  • another advantage/feature is the apparatus having the encoder as described above, wherein the at least one syntax is included in a parameter set corresponding to the resultant bitstream.
  • the teachings of the present principles are implemented as a combination of hardware and software.
  • the software may be implemented as an application program tangibly embodied on a program storage unit.
  • the application program may be uploaded to, and executed by, a machine comprising any suitable architecture.
  • the machine is implemented on a computer platform having hardware such as one or more central processing units (“CPU”), a random access memory (“RAM”), and input/output (“I/O”) interfaces.
  • CPU central processing units
  • RAM random access memory
  • I/O input/output
  • the computer platform may also include an operating system and microinstruction code.
  • the various processes and functions described herein may be either part of the microinstruction code or part of the application program, or any combination thereof, which may be executed by a CPU.
  • various other peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit.

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
US12/224,816 2006-03-29 2007-02-27 Multi-View Video Coding Method and Device Abandoned US20090225826A1 (en)

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