Classifications

• • 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
  • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
  • H04N19/91—Entropy coding, e.g. variable length coding [VLC] or arithmetic 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
  • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
• • 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
  • H04N19/20—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding
  • H04N19/29—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding involving scalability at the object level, e.g. video object layer [VOL]
• • 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
  • H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• • 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
  • H04N19/503—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
  • H04N19/513—Processing of motion vectors
• • 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
  • H04N19/70—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

• Digital video capabilities can be incorporated into a wide range of devices, including digital televisions, digital direct broadcast systems, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, tablet computers, e-book readers, digital cameras, digital recording devices, digital media players, video gaming devices, video game consoles, cellular or satellite radio telephones, so-called "smart phones," video teleconferencing devices, video streaming devices, and the like.
• Digital video devices implement video compression techniques, such as those described in the standards defined by MPEG-2, MPEG-4, ITU-T H.263, ITU-T H.264/MPEG-4, Part 10, Advanced Video Coding (AVC), the High Efficiency Video Coding (HEVC) standard, and extensions of such standards.
• the video devices may transmit, receive, encode, decode, and/or store digital video information more efficiently by implementing such video compression techniques.
• this disclosure relates to techniques for coding visual signal information, such as video format, video full range flag, colour_primaries, transfer characteristics, matrix coeffs, per layer in the VPS.
• this disclosure relates to techniques for avoiding the signaling of the maximum number of temporal sub-layers that may be present in each coded video sequence (CVS) (sps max sub layers minusl) or whether inter prediction is additionally restricted for CVSs (sps temporal id nesting flag) in SPSs with layer ID greater than 0.
• CVS coded video sequence
• this disclosure relates to techniques for, syntax element output_layer_set_idx[ i ] may be changed to output_layer_set_idx_minusl [ i ] in accordance with the techniques of this disclosure.
• the disclosure describes a method of decoding multilayer video data, the method comprising receiving a first output layer set for a layer set, receiving a second output layer set for the layer set, and decoding video data for at least one of the first output layer set and the second output layer set.
• FIG. 5 is a flowchart illustrating another example method for encoding video data in accordance with the systems and methods described herein.
• more than one output layer set may be signalled for one layer set.
• the syntax element output_layer_flag[ lsldx ][ j ] may be changed to output_layer_flag[ i ][ j ], and related semantics are changed accordingly.
• the video coder may further transmit or receive a sequence parameter set (SPS) with a nuh layer id equal to 0, wherein the SPS includes a profile, tier, and level syntax structure for a layer of video data.
• the nuh layer id may be used to indicate a particular layer.
• a layer may be a set of video coding layer (VCL) network abstraction layer (NAL) units that all have a particular value of nuh layer id and the associated non-VCL NAL units, or one of a set of syntactical structures having a hierarchical relationship, nuh layer id shall be equal to 0 in a bitstream containing only one layer. Other values of nuh layer id may appear in bitstreams containing multiple layers.
• VCL video coding layer
• NAL network abstraction layer
• the video coder may transmit or receive, as applicable, an output layer flag [i] [j] that, when equal to 1, specifies that a j-th layer in the layer set is a target output layer of an i-th output layer set, and, when equal to 0, specifies that the j-th layer in the layer set is not the target output layer of the i-th output layer set.
• the video coder may also generate the output layer set based on the output layer flag [i] [j] by specifying the layers corresponding to output layer flag [i] [j] equal to 1 as the associated list of target output layers.
• video encoder 20 may encode the output layer set based on the output layer flag [i] [j].
• Video decoder 30 may decode the output layer set based on the output layer flag [i] [j].
• a video coder such as a video encoder 20 or a video decoder 30 may code multilayer video data including layers of video data.
• vps num layer sets minusl is entropy coded, as indicated by the ue(v) descriptor, in the VPS, and there are other entropy coded syntax elements before vps num layer sets minusl in the VPS.
• entropy decoding may be undesirable. This may be particularly true for intermediate network devices that may perform splicing or stream adaptation (e.g., temporal rate, quality, spatial adaptation).
• a decoder e.g., video decoder 30
• the syntax element profile_ref_minusl [ i ] specifies that the profile and tier information for the i-th profile_tier_level( ) syntax structure may be inferred to be equal to the profile and tier information for the (profile_ref_minusl [ i ] + l)-th
• profile_tier_level( ) syntax structure The value of profile ref minusl [ i ] + 1 may be less than i.
• the encoded profile, tier, and/or level information in the VPS may be decoded by video decoder 30, which may be a device that does not include an entropy decoder, such as a MANE. Some examples may use reduced or limited entropy encoding for the profile, tier, level information in the VPS. For example, perhaps some profile, tier, level information in the VPS is entropy encoded while other profile, tier, level information in the VPS is not entropy encoded.
• Motion estimation processing unit 42 may be configured to determine the inter- prediction mode for a video slice according to a predetermined pattern for a video sequence.
• the predetermined pattern may designate video slices in the sequence as P slices or B slices.
• Motion estimation processing unit 42 and motion compensation processing unit 44 may be highly integrated, but are illustrated separately for conceptual purposes.
• Motion estimation, performed by motion estimation processing unit 42 is the process of generating motion vectors, which estimate motion for video blocks.
• a motion vector for example, may indicate the displacement of a prediction unit (PU) of a video block within a current video frame or picture relative to a predictive block within a reference picture.
• PU prediction unit
• the video encoder 20 may transmit or receive an SPS with a nuh layer id equal to 0, wherein the SPS includes a profile, tier, and level syntax structure for a layer of video data.
• video encoder 20 may send an SPS with a nuh layer id equal to 0, wherein the SPS includes a profile, tier, and level syntax structure for a layer of video data.
• the encoding may be performed by entropy encoding processing unit 56.
• Motion compensation processing unit 82 may also perform interpolation based on interpolation filters. Motion compensation processing unit 82 may use interpolation filters as used by video encoder 20 during encoding of the video blocks to calculate interpolated values for sub-integer pixels of reference blocks. In this case, motion compensation processing unit 82 may determine the interpolation filters used by video encoder 20 from the received syntax elements and use the interpolation filters to produce predictive blocks.
• video decoder 30 may receive a non-entropy encoded set of profile, tier, and level syntax structures.
• Video decoder 30 may also generate the output layer set based on the output layer flag [i] [j]. [0147] In the illustrated example of FIG. 3, video decoder 30 may decode multilayer video data including layers of video data.
• the syntax element output_layer_set_idx[ i ] may be changed to output_layer_set_idx_minusl [ i ], as described below.
• the profile_tier_level( ) syntax structure in the SPS is not applied for that layer.
• the signaling of layer dependency is moved up to be accessible without entropy decoding. Changing of the syntax element output_layer_set_idx[ i ] to output_layer_set_idx_minusl [ i ] is due to the following reasons.
• vps num rep formats is equal to 1, the value of vps_rep_format_idx[ i ] may be inferred to be equal to 0.
• the value of vps_rep_format_idx[ i ] may be in the range of 0 to vps_num_rep_formats - 1, inclusive.
• vui_parameters( ) syntax structure that applies to the layer with nuh layer id equal to layer_id_in_nuh[ i ].
• the length of the vps_vui_params_idx[ i ] syntax element may be Ceil( Log2( vps_num_vui_params ) ) bits.
• vps_num_vui_params When vps_num_vui_params is equal to 1, the value of vps_vui_params_idx[ i ] may be inferred to be equal to 0.
• the value of vps_vui_params_idx[ i ] may be in the range of 0 to vps_num_vui_params - 1, inclusive.
• sub_layer_vps_ordering_info_present_flag[ i ] being equal to 0, it may be inferred to be equal to max_vps_latency_increase_plusl [ i ][ max_sub_layers_vps_minusl [ i ] ].
• a short_term_ref_pic_set( ) syntax structure directly signalled in the slice headers of a current picture has an index equal to
• short_term_ref_pic_set( ) syntax structure in the current short_term_rps_candidates( ) syntax structure is set to be the same as the idx_in_rps_cand[ i ]-th
• sps_max_num_reorder_pics[ i ] are present for sps max sub layers minusl + 1 sub-layers.
• sps_sub_layer_ordering_info_present_flag being equal to 0, it may be inferred to be equal to sps_max_dec_pic_buffering_minusl [ sps max sub layers minusl ].
• the parameter sps_scaling_list_data_present_flag 1 specifies that scaling list data are present in the SPS [START EXAMPLE F] or inherited from the active VPS [END EXAMPLE F] .
• sps_scaling_list_data_present_flag 1 specifies that scaling list data are present in the SPS [START EXAMPLE F] or inherited from the active VPS [END EXAMPLE F] .
• sps_scaling_list_data_present_flag 0 specifies that scaling list data are not present in the SPS [START EXAMPLE F] and not inherited from the active VPS [END EXAMPLE F] .
• video decoder 30 may receive an output layer flag [i] [j] that, when equal to 1, specifies that a j-th layer in the layer set is a target output layer of an i- th output layer set, and, when equal to 0, specifies that the j-th layer in the layer set is not the target output layer of the i-th output layer set.
• video encoder 20 may transmit an output layer flag [i] [j] that, when equal to 1, specifies that a j-th layer in the layer set is a target output layer of an i-th output layer set, and, when equal to 0, specifies that the j-th layer in the layer set is not the target output layer of the i-th output layer set.
• video encoder 20 may encode an SPS with a nuh layer id equal to 0, wherein the SPS includes a profile, tier, and level syntax structure for a layer of video data.
• video encoder 20 may send an SPS with a nuh layer id equal to 0, wherein the SPS includes a profile, tier, and level syntax structure for a layer of video data.
• an SPS with nuh layer id equal to 0 is referred by a layer with nuh layer id greater than 0, the profile_tier_level( ) syntax structure in the SPS is not applied for that layer.
• the dependency information may indicate whether one of the layers is a direct reference layer for another of the layers and identify the one of the layers that is a direct reference layer for another of the layers.
• the layer dependency information includes a direct_dependency_flag[ i ][ j ] that, when equal to 0, specifies that a layer with index j is not a direct reference layer for a layer with index i, and when equal to 1 , specifies that the layer with index j may be a direct reference layer for the layer with index i.
• FIG. 9 is a flowchart illustrating an example method for encoding video data in accordance with the systems and methods described herein.
• video encoder 20 may encode video data for at least one of a first output layer set and a second output layer set (902).
• output interface 22 may transmit encoded data from video encoder 20.
• the data transmitted may include the first output layer set for a layer set (904) and the second output layer set for the layer set (906).
• output interface 22 may transmit the data to input interface 28.
• output interface 22 may transmit the data to storage device 34 for storage.
• coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
• DSL digital subscriber line
• computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient media, but are instead directed to non-transient, tangible storage media.
• the techniques of this disclosure may be implemented in a wide variety of devices or apparatuses, including a wireless handset, an integrated circuit (IC) or a set of ICs (e.g., a chip set).
• IC integrated circuit
• a set of ICs e.g., a chip set.
• Various components, modules, or units are described in this disclosure to emphasize functional aspects of devices configured to perform the disclosed techniques, but do not necessarily require realization by different hardware units. Rather, as described above, various units may be combined in a codec hardware unit or provided by a collection of intraoperative hardware units, including one or more processors as described above, in conjunction with suitable software and/or firmware.

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