CN101395922A - Method and apparatus for decoding/encoding a video signal - Google Patents
Method and apparatus for decoding/encoding a video signal Download PDFInfo
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Abstract
A method of decoding a current layer using inter-layer prediction is disclosed. The present invention includes obtaining a first flag information indicating whether a current block of the current layer is coded using the inter-layer prediction, obtaining a quality identification information identifying a quality of the current block, obtaining a second flag information based on the first flag information and the quality identification information, the second flag information indicating whether a reference block is included in a specific slice of a reference layer, and decoding the current block based on the second flag information.
Description
Technical field
The present invention relates to a kind of scheme of coding/decoding vision signal.
Background technology
In general, the compression coding/decoding is meant and perhaps with suitable form it is stored in a series of signal processing technology of storage medium by the transmitting digitized information of communication line.The object of compressed encoding has audio frequency, video, literal etc., especially is that the scheme of object execution compressed encoding is called the video sequence compression with the video.Usually, the feature of video sequence is to have spatial redundancy and time redundancy.
Especially, scalable-video-coded bit stream can partly and optionally be decoded.For instance, the basic layer of the decoder decodable code of low complex degree, and, can extract the bit stream of low data rate in order to be transmitted by network with limited capacity amount.In order further little by little to generate high-resolution image, need improve the quality of image stage by stage.
Summary of the invention
Technical problem
Especially, scalable-video-coded bit stream can partly and optionally be decoded.For instance, the basic layer of the decoder decodable code of low complex degree, and, can extract the bit stream of low data rate in order to be transmitted by network with limited capacity amount.In order further little by little to generate high-resolution image, need improve the quality of image stage by stage.
Technological means
Therefore, The present invention be directed to a kind of scheme of coding/decoding vision signal, it has fully avoided one or more problems of causing because of the restriction of correlation technique and shortcoming.
An object of the present invention is to provide a kind of method of the coding/decoding efficient when being used to improve the coding/decoding vision signal.
Another object of the present invention provides under a kind of zone in enhancement layer and the not corresponding situation of reference layer and makes the minimized method of the transmission of Information relevant with inter-layer prediction.
Another object of the present invention provides and a kind ofly makes the minimized method of the transmission of Information relevant with inter-layer prediction by the configuration information of confirming the bit stream behind the scalable video.
Another object of the present invention provides a kind of by whether confirming to represent that the information of inter-layer prediction makes the minimized method of the transmission of Information relevant with inter-layer prediction.
An object of the present invention is to provide a kind of by confirming that quality identification information makes the minimized method of the transmission of Information relevant with inter-layer prediction.
Another object of the present invention provides the method that a kind of information of handling by definition expression band boundaries improves the coding/decoding efficient of vision signal.
Further purpose of the present invention provides a kind of method that improves the coding/decoding efficient of vision signal by the configuration information of confirming the bit stream behind the scalable video in place.
Beneficial effect
Correspondingly, the invention provides following effect or advantage.
At first, whether the present invention can use inter-layer prediction predicted by the current block of checking enhancement layer.Under the predicted situation, just do not need to transmit the coding/decoding information that is used for inter-layer prediction at the current block of above-mentioned enhancement layer by using inter-layer prediction.Therefore, the present invention can improve coding/decoding efficient.Secondly, by going up the configuration information of confirming the bit stream behind the scalable video in place, make that the transmission of Information relevant with inter-layer prediction minimizes.For instance, whether represent the information and/or the quality identification information of inter-layer prediction the transmission of Information relevant with inter-layer prediction to be minimized by identification.And the present invention can represent the information of the processing of band boundaries by definition, makes parallel processing become possibility.Can improve the coding/decoding efficient of vision signal significantly by the whole bag of tricks of using above-mentioned explanation.
Description of drawings
The included accompanying drawing of the present invention is used to provide to further understanding of the present invention, and they are bonded to this part that has also constituted this specification, and these accompanying drawings show embodiments of the invention, and is used from explanation principle of the present invention with specification one.
In the accompanying drawing:
Fig. 1 is the schematic block diagram according to scalable video of the present invention system;
Fig. 2 and Fig. 3 are respectively the structure chart and the image that is used to illustrate this configuration information that rises to the configuration information of the scalable sequence in the scalable-video-coded bit stream according to an embodiment of the invention;
Fig. 4 is basic layer after the sampling according to an embodiment of the invention and the figure that cuts (cropping) relation between the enhancement layer;
Fig. 5 is respectively figure according to an embodiment of the invention and by the macroblock prediction of the inter-layer prediction grammer relevant with sub-macroblock prediction with Fig. 6;
Fig. 7 is figure according to an embodiment of the invention and by the relevant grammer of the residual prediction of inter-layer prediction;
Whether Fig. 8 carries out the structure chart that inter-layer prediction is carried out the grammer of block elimination filtering for the basis that is used for according to an embodiment of the invention;
Whether Fig. 9 carries out the structure chart of grammer that inter-layer prediction is represented the offset information of reference picture behind the up-sampling and the position difference between present image for basis according to an embodiment of the invention;
Whether Figure 10 carries out the structure chart that inter-layer prediction obtains to represent whether to limit the grammer of the flag information of piece (intra-block) in the frame that uses in the reference layer for basis according to an embodiment of the invention;
Whether Figure 11 carries out the structure chart that inter-layer prediction obtains the grammer of adaptive prediction information for the basis that is used for according to an embodiment of the invention.
Preferred forms
Other features and advantages of the present invention will be illustrated in the following description, and its part can be understood from explanation, maybe can obtain by implementing the present invention.Purpose of the present invention and other advantages can realize by the structure of being specifically noted in specification and claim and the accompanying drawing and obtain.
In order to realize these and other advantages and according to as comprising and broadly described purpose of the present invention, comprise according to the method for a kind of decoded video signal of the present invention: the bit stream of decoding ground floor; Obtain expression whether to the flag information of the current block inter-layer prediction of the second layer; Obtain at least one offset information based on this flag information, this offset information represents to be used for the position difference between the present image of image behind the up-sampling of this ground floor of this inter-layer prediction and this second layer; With by using this at least one offset information, the reference picture of this ground floor is carried out up-sampling.
Preferably, this method further comprises the information whether parameter that expression is used for this up-sampling is present in the respective regions of this second layer that obtains, wherein, whether this parameter that is used for this up-sampling based on this expression is present in the information of this respective regions of this second layer, obtains this at least one offset information.
More preferably, this method comprises that further whether this parameter that is used for this up-sampling based on this expression is present in the information of this respective regions of this second layer, obtains the information about the phase shift of carrier chrominance signal, wherein, by using this information about the phase shift of carrier chrominance signal, this ground floor is sampled.
Here, the information based on the expression chroma format obtains this information about the phase shift of carrier chrominance signal.And, should comprise phase shift information on the horizontal direction and the phase shift information on the vertical direction about information of the phase shift of carrier chrominance signal.
More preferably, this method further comprises the quality identification information of the quality of this current block that obtains to be used to discern this second layer, wherein, obtains this offset information based on this quality identification information.
Preferably, the screen proportion or the spatial resolution of this second layer and this ground floor are different, and this ground floor comes from the same video signal of this second layer.
In order further to realize these and other advantages and according to purpose of the present invention, a kind of device that is used for decoded video signal comprises: basic layer decoder unit, the bit stream of the ground floor that is used to decode; First header obtains the unit, whether is used to obtain to represent the flag information to the current block inter-layer prediction of the second layer; Second header obtains the unit, is used for obtaining at least one offset information based on this flag information, and this offset information represents to be used for the position difference between the present image of image behind the up-sampling of this ground floor of this inter-layer prediction and this second layer; With the up-sampling unit, be used for by using this at least one offset information, the reference picture of this ground floor is carried out up-sampling.
Be understandable that above general description and the following detailed description all be example with indicative, and can provide and further specify of the presently claimed invention.
The working of an invention mode
Be elaborated referring now to the preferred embodiment of the present invention, its example is represented in the accompanying drawings.
At first, consider between spatial redundancy, time redundancy, scalable redundancy, visual angle redundant to the compression coding/decoding of video signal data.The compression coding/decoding of considering scalable redundancy is one embodiment of the present of invention.But technical conceive of the present invention is applicable to redundancy between time redundancy, spatial redundancy, visual angle etc.Further, " coding/decoding " of indication comprises two notions of Code And Decode in this specification, can make an explanation neatly according to technical conceive of the present invention and technical scope.
In the bit sequence configuration of vision signal, exist and be referred to as NAL (NetworkAbstraction Layer, network abstract layer) independently layer structure, it is positioned at the VCL (Video Code Layer, video coding layer) that carries out moving image encoding process itself and transmission also between the following level system of memory encoding information.Cataloged procedure generates and is output as the VCL data, and it was mapped as the NAL unit before transmission or storage.Each NAL unit comprises the video data of compression or corresponding to the data RBSP of header (Raw Byte Sequence Payload, raw byte sequence payload, the result data of moving image compression).
The NAL unit consists essentially of NAL head and RBSP two parts.Comprise expression in the NAL head and whether comprise information (nal_unit_type) as the type of the flag information (nal_ref_idc) of the band of the reference picture of this NAL unit and expression NAL unit.Initial data in RBSP after the store compressed.And,, add RBSP tail bit (RBSP trailing bit) in the end of RBSP part for the lengths table that makes RBSP is shown the multiple of 8 bits.The type of NAL unit has IDR (Instantaneous Decoding Refresh, instantaneous decoding refresh) image, SPS (SequenceParameter Set, sequence parameter set), PPS (Picture Parameter Set, picture parameter set) and SEI (Supplemental Enhancement Information, supplemental enhancement information) etc.
Therefore, if the information (nal_unit_type) of the type of expression NAL unit is expressed as scalable video coded slice, can improve coding/decoding efficient by increasing the various configuration informations relevant with above-mentioned scalable coding/decoding.For instance, can increase whether the current access unit of expression is the flag information of instantaneous decoding refresh (hereinafter referred to as IDR) access unit, the dependency identification information of representation space scalability, quality identification information, whether expression uses the flag information (no_inter_layer_pred_flag) of inter-layer prediction, priority identification information etc.It will be elaborated with reference to figure 2.
In standard,, stipulated for various abridged tables and other requirement of level in order to buy target product with suitable expense.In this case, decoder must satisfy according to determined requirement in corresponding abridged table and the rank.Similarly, defined " abridged table " and " rank " two conceptions of species and come representative function or parameter, it is used to represent the manageable size that is compressed the scope of sequence of decoder.Can discern bit stream based on predetermined abridged table by profile identifier (profile_idc).Profile identifier be meant the expression bit stream based on the sign of abridged table.For instance, H.264/AVC in, if profile identifier is 66, its expression bit stream based on baseline profile; If profile identifier is 77, its expression bit stream is based on main abridged table; If profile identifier is 88, its expression bit stream is based on extended profile.In addition, above-mentioned profile identifier can be included in sequential parameter and concentrates.
Therefore, in order to handle scalable sequence, need whether the bit stream of identification input is the abridged table of scalable sequence, if be identified as the abridged table with scalable sequence, being necessary to increase the additional information that grammer makes at least one be used for scalable sequence can be transmitted.Here the abridged table of scalable sequence as additional aspects H.264/AVC, represents to be used to handle the profile mode of telescopic video.Because for traditional AVC technology, SVC is an additional aspects, so, and unconditionally increase grammer and compare, it is more effective as the additional information that is used for the SVC pattern to increase grammer.For instance, when the profile identifier of AVC is expressed as the abridged table of scalable sequence, if increase can improve coding/decoding efficient about the information of scalable sequence.
Below be used to provide the various embodiment of effective vision signal coding/decoding method with explanation.
Fig. 1 is the schematic block diagram according to telescopic video coding/decoding of the present invention system.
In order to be provided for the sequence optimized of various communication environments and various terminals, the sequence that offers terminal should be diversified.If be provided to corresponding terminal for the optimized sequence of each terminal, represent that single sequence source is prepared the combined value that is used for various parameters, these parameters comprise transmission frame number, the resolution of per second, bit number of each pixel etc.Therefore, providing of sequence optimized applied burden to content supplier.Therefore, content supplier is encoded to original series the compressed sequence data of high bit rate.When receiving the sequence of requests of being made by terminal, content supplier's decoding original series is encoded to the sequence data of the series processing ability that is suitable for terminal to it, and then the data behind this coding is offered terminal.Because this code conversion is accompanied by coding-decoding-cataloged procedure, so in the process of sequence is provided, can not avoid generation time to postpone.Therefore, need complicated hardware equipment and algorithm in addition.
On the other hand, scalable video (SVC) is a kind ofly to be used for encoding scheme with the optimum picture quality encoded video signal so that the partial sequence of the image sequence that is produced is expressed as sequence by decoding.Here, partial sequence can be represented the sequence that constituted by select frame off and on by from whole sequence.For by SVC image encoded sequence, by the usage space scalability, sequence size can be used for low bit rate by reduction.And, but also the service quality scalability reduces the picture quality of sequence.Here, the image sequence with small-size screen and/or low number of pictures per second can be called as basic layer, and the sequence with relative large scale screen and/or high relatively number of pictures per second can be called as be enhanced or enhancement layer.
Realize that in the mode with the processing section sequence of receiving only the sequence of low image quality represents by the above-mentioned scalable scheme image encoded sequence of mentioning.Yet if the bit rate step-down, picture quality just degradation is a lot.In order to solve the image quality issues of degradation, can provide independently auxiliary picture sequence for low bit rate, for instance, have the image sequence of small-size screen and/or low number of pictures per second.Such auxiliary sequencel can be called as basic layer, and main picture sequence can be called as be enhanced or enhancement layer.
When description was used for the various embodiment of inter-layer prediction, the present invention had used the notion that comprises basic layer and enhancement layer.For example, enhancement layer can have and basic different spatial resolution of layer or screen proportion.And enhancement layer can have and the different picture quality of basic layer.In detail for instance, basic layer can be a reference layer, and enhancement layer can be to work as anterior layer.Basic layer and the enhancement layer hereinafter explained only are exemplary, and it does not constitute the restriction that the present invention is explained.
Below describe telescopic video coding/decoding system in detail.At first, scalable coding/decoding system comprises encoder 102 and decoder 110.Encoder 102 comprises basic layer coding unit 104, enhancement layer coding unit 106 and Multiplexing Unit 108.And decoder can comprise dequantisation unit 112, basic layer decoder unit 114 and enhancement layer decoder unit 116.Basic layer coding unit 104 can produce elementary bit stream by the sequence signal X (n) of compression input.Enhancement layer coding unit 106 can produce enhancement layer bit-stream by sequence signal X (n) that uses input and the information that is produced by basic layer coding unit 104.And Multiplexing Unit 108 can produce scalable bitstream by using basic layer bit stream and enhancement layer bit-stream.
The scalable bitstream that is produced is sent to decoder 110 by particular channel, and the scalable bitstream that is transmitted can be divided into enhancement layer bit-stream and basic layer bit stream by the dequantisation unit 112 of decoder 110.Basic layer decoder unit 114 receives basic layer bit stream and is basic layer bit stream decoding the sequence signal between macro block and the residual sum movable information of interblock.Here, can carry out corresponding decoding based on the single loop coding/decoding method.
Enhancement layer decoder unit 116 receives enhancement layer bit-stream, and with reference to the basic layer of output sequence signal Xe (n) that decodes that rebuilds by basic layer decoder unit 114.Here, output sequence signal Xb (n) will be have than after the low picture quality of output sequence signal Xe (n) or the sequence signal of resolution.
Therefore, each of enhancement layer coding unit 106 and enhancement layer decoder unit 116 is all by using inter-layer prediction to carry out coding.Inter-layer prediction is represented the sequence signal by movable information that uses basic layer and/or texture information prediction enhancement layer.Here, texture information can represent to belong to the view data or the pixel value of macro block.For example, in inter-layer prediction method, fundamental forecasting pattern (intra baseprediction mode) or residual prediction mode in the frame are arranged.The fundamental forecasting pattern can represent to be used for to predict the pattern based on the piece of the enhancement layer of the respective regions of basic layer in the frame.Here, the respective regions in the basic layer can be represented the zone with the interlayer pattern-coding.Simultaneously, residual prediction mode can be used the respective regions with residual error data, and this residual error data is the image difference in the basic layer.In two kinds of situations, the respective regions in the above-mentioned basic layer can be used for inter-layer prediction by sampling extended or dwindling.Sampled representation changes image resolution ratio.And sampling can comprise resampling, down-sampling, up-sampling etc.For instance, can in sample, resample with inter-layer prediction.And, can produce pixel data again to reduce image resolution ratio by using downsampling filter, this can be called as down-sampling.And, can generate some additional pixel data to improve image resolution ratio by using up-sampling filter, this can be called as up-sampling.Resampling can comprise down-sampling and two notions of up-sampling.Among the present invention, can come this term of correct interpretation " sampling " according to scope and the technological thought of corresponding embodiment of the present invention.
Simultaneously, for the identical sequence content, for different purposes or basic layer of purpose generation and enhancement layer, and they are different mutually at aspects such as spatial resolution, frame rate, bit rates.When the inter-layer prediction encoded video signal, non-dyadic case, promptly enhancement layer is not 2 integer to the ratio of basic layer on spatial resolution, can be called as extending space scalability (ESS).For instance, when by inter-layer prediction with enhancement layer coding when having the vision signal of 16:9 (level: vertical) ratio, basic layer may take place be encoded as this situation of image with 4:3 ratio.Under this situation,,, can not cover the whole zone of enhancement layer even basic layer is extended to be used for inter-layer prediction because the state that cuts (cropping state) that basic layer is partly cut according to raw video signal is encoded.Therefore, since not corresponding zone in sampled basic layer, the subregion of enhancement layer, the information of the basic layer behind the up-sampling that is used for inter-layer prediction just can not be used in this subregion.That is to say that this expression inter-layer prediction is not suitable for this subregion.Under this situation, the coded message that is used to inter-layer prediction may not be transmitted.Describe relevant specific embodiment in detail below with reference to Fig. 5 to Figure 11.
Fig. 2 and Fig. 3 are respectively the structure chart of the configuration information of the scalable sequence that joins scalable-video-coded bit stream according to an embodiment of the invention, and are used to describe the image of this configuration information.
Fig. 2 shows the topology example of NAL unit, and the feasible configuration information about scalable sequence in this NAL unit adds wherein.At first, the NAL unit can mainly comprise NAL unit header and RBSP (raw byte sequence payload: the result data of moving image compression).The NAL unit header can comprise whether expression NAL unit comprises the information (nal_unit_type) of the identifying information (nal_ref_idc) and the expression NAL cell type of the band of reference picture.And, also can comprise the extended area of NAL unit header with limitation.For example in fact, if the information of expression NAL cell type and scalable video are associated or represent prefix NAL unit, the NAL unit can comprise the extended area of this NAL unit header so.Particularly, if nal_unit_type equals 20 or 14, the NAL unit can comprise the extended area of NAL unit header.And, can whether be next extended area that joins the NAL unit header about the configuration information of scalable sequence of flag information (svc_mvc_flag) of SVC bit stream according to discerning it.
In another example, if the information of expression NAL cell type is the information of expression subset sequence parameter, RBSP can comprise the information about subset sequence parameter.Particularly, if nal_unit_type equals 15, RBSP can comprise the information about subset sequence parameter, about information of slice layer etc.Under this situation, according to profile information, subset sequence parameter can comprise the extended area of sequence parameter set.For instance, if profile information (profile_idc) is the abridged table relevant with scalable coding, subset sequence parameter can comprise the extended area of sequence parameter set so.Perhaps, according to profile information, sequence parameter set can comprise the extended area of sequence parameter set.The extended area of sequence parameter set can comprise the de-blocking filter that is used to control inter-layer prediction characteristic information and be used for the information etc. of the parameter correlation of up-sampling process.About the various configuration informations of scalable sequence, for example, can be included in the extended area of NAL unit header, the extended area and the configuration information in the slice layer of sequence parameter set will describe in detail hereinafter.
At first, can obtain flag information (inter_layer_deblocking_filter_control_present_flag) from the extended area of sequence parameter set, this flag information represents whether to exist the information of characteristic that is used for the de-blocking filter of inter-layer prediction for control.And, can acquired information (extended_spatial_scalability) from the extended area of sequence parameter set, this information representation is used for the position of information of the parameter correlation of up-sampling process.Particularly, for instance,, can be illustrated in and do not have any parameter that is used for the up-sampling process in sequence parameter set or the slice header if extended_spatial_scalability equals 0.If extended_spatial_scalability equals 1, can be illustrated in sequential parameter and concentrate existence to be used for the parameter of up-sampling process.If extended_spatial_scalability equals 2, can be illustrated in the slice header and to have the parameter that is used for the up-sampling process.Hereinafter will describe the parameter that is used for the up-sampling process in detail with reference to figure 9.
Whether expression uses the information of inter-layer prediction 4. can be meant the flag information whether the expression inter-layer prediction is used in the decoding to encoding strip thereof.Flag information can obtain from the extended area of NAL head.For instance, if flag information is set as 1, can represent not use inter-layer prediction.If flag information is set as 0, can use or not use inter-layer prediction according to the encoding scheme in the macro block.This is because the inter-layer prediction in the macro block can use or not use.
3. quality identification information represents to discern the information of the quality of NAL unit.To be described with reference to Figure 3 configuration information.For instance, single image can be encoded into the different layer of phase mutual mass.Among Fig. 3, the layer on Spa_Layer0 and the Spa_Layer1 can be encoded as the different layer of phase mutual mass.Particularly, suppose that the information of identification NAL element quality is named as quality_id, layer B1, B2 ..., B10 can be set to quality_id and equal 0.And, layer Q1, Q2 ..., Q10 can be set to quality_id and equal 1.In other words, layer B1, B2 ..., B10 can represent to have the layer of lowest image quality.These are called as primary image.Layer Q1, Q2 ..., Q10 is corresponding to comprising a layer B1, B2 ..., the layer of B10, and have than layer B1, B2 ..., the picture quality that B10 is good.And quality identification information can be defined according to variety of way.For instance, quality identification information can be expressed as 16 ranks.
The information of representation space scalability is meant the information of the dependence of the relevant NAL of expression identification unit.Be described with reference to Figure 3 configuration information.For instance, dependence can change according to spatial resolution.Among Fig. 3, the layer among Spa_Layer0 and the Spa_Layer1 has equal resolution.Layer among the Spa_Layer0 can comprise by the layer among the Spa_Layer1 is carried out the image that down-sampling obtains.Particularly, for instance, suppose that identification is represented as dependency_id about the information of the dependence of NAL unit, the dependency_id between the layer among the Spa_Layer0 equals 0.And the dependency_id between the layer among the Spa_Layer1 equals 1.Dependency identification information can be defined according to variety of way.Therefore, the NAL unit with identification dependency information of identical value can represent that (dependency representation) represents with dependence.
Simultaneously, can define single layer according to the information and the quality identification information of identification dependence.In this case, have the information of identification dependence of identical value and the NAL unit of quality identification information and can represent that (layer representation) represents with layer.
The identifying information of express time scalability is meant identification other information of time stage about the NAL unit.Can the time rank be described according to classification B picture structure.For example in fact, and the layer among the Spa_Layer0 (B1, Q1) and layer (B3 Q3) can have identical time rank Tem_Layer0.If layer (B5, Q5) reference level (B1, Q1) and layer (B3, Q3), so layer (B5, Q5) can have than layer (B1, Q1) and layer (B3, the time rank Tem_Layer1 that time rank Tem_Layer0 Q3) is high.Similarly, if layer (B7, Q7) reference level (B1, Q1) and layer (B5, Q5), layer (B7 Q7) has than layer (B5, the time rank Tem_Layer2 that time rank Tem_Layer1 Q5) is high so.Can there be identical time class value all NAL unit in single access unit.In the situation of IDR access unit, time class value can be changed into 0.
The flag information whether expression is used as reference picture with reference to primary image be illustrated in the inter-layer prediction process whether be used as reference picture with reference to primary image or in inter-layer prediction process decoded picture whether be used as reference picture.For with the NAL unit in one deck, promptly have the NAL unit of the information of identical identification dependence, flag information can have identical value.
Priority tag information is meant the information of the priority of identification NAL unit.By using priority tag information to provide that extensibility is possible between interlayer extensibility or image.For instance, be possible by using priority tag information to provide various times and other sequence of space level to the user.Therefore, the user can only watch the sequence on special time and the space, perhaps only watches the sequence according to different restrictive conditions.Precedence information can be configured according to different modes according to its reference conditions.Priority information can be not based on specific reference and by random arrangement.And precedence information can be decided by decoder.
And the configuration information in the extended area of NAL unit header can comprise whether the current access unit of expression is the flag information of IDR access unit.
The various information that are used for inter-layer prediction can be included in slice layer.For instance, can comprise in the expression up-sampling process for the information of the processing of band boundaries 5., the information relevant with the operation of de-blocking filter 6., the information relevant with the phase shift of carrier chrominance signal 7., the offset information of the position difference between basic layer of expression and the enhancement layer 8. and expression whether have an adaptive prediction information 9..Above-mentioned information can be obtained from slice header.
As information 6. the example relevant with the operation of de-blocking filter, can have the method for expression de-blocking filter information (disable_deblocking_filter_idc), the necessary offset information of block elimination filtering (inter_layer_slice_alpha_c0_offset_div2, inter_layer_slice_beta_offset_div2).
As information 7. the example relevant with the phase shift of carrier chrominance signal, can be relevant for the level and vertical phase shift (scaled_ref_layer_left_offset of the chromatic component of the image that is used for inter-layer prediction, scaled_ref_layer_top_offset, scaled_ref_layer_right_offset, information scaled_ref_layer_bottom_offset).
Offset information example 8. as the position difference between presentation layer, can there be expression to be used for the information (scaled_ref_layer_left_offset of the upper and lower, left and right position difference of reference picture behind the up-sampling of inter-layer prediction and present image, scaled_ref_layer_top_offset, scaled_ref_layer_right_offset, scaled_ref_layer_bottom_offset).
Information example 5. as the processing of the macro block at the band boundaries place in the basic layer of the expression up-sampling process, can have expression to be present in when the corresponding Intra-coded blocks (intra-codedblock) in the basic layer under the situation of at least two bands of enhancement layer, whether current macro can not be by using the predicted information (constrained_intra_resampling_flag) of corresponding Intra-coded blocks in the basic layer.
And whether whether expression exist the information of adaptive prediction 9. can be illustrated in to exist in slice header and the macroblock layer and predict the information that is associated.According to the information of representing whether to exist adaptive prediction, can determine to use the adaptive forecasting method of which kind of type.With reference to Figure 11 it is elaborated after a while.
Fig. 4 is the figure about basic layer after the sampling and the relation of cutting (croppingrelation) between the enhancement layer 1.
In scalable video, can check whether the current block of enhancement layer can use inter-layer prediction.For instance, can check whether the zone corresponding to all pixels in the current block is present in the basic layer.As the result of checking process,, so just needn't transmit the coded message that is used for inter-layer prediction if the current block of enhancement layer is not used to inter-layer prediction.Therefore, can improve code efficiency.
Therefore, can define a function, whether its current block that can check enhancement layer has used inter-layer prediction.For instance, function in_crop_window () can be defined as being used for checking whether the zone corresponding to all pixels of current block is present in the basic layer.Suppose that the macro index on the horizontal direction on the enhancement layer is set to mbIdxX, and the macro index on the vertical direction is set to mbIdxY, if satisfy following condition, function in_crop_window () can return value " TRUE " (or " 1 ").
mbIdxX≥(ScaledBaseLeftOffset+15)/16
mbIdxX≤(ScaledBaseLeftOffset+ScaledBaseWidth-1)/16
mbIdxY≥(ScaledBaseTopOffset+15)/16
mbIdxY≤(ScaledBaseTopOffset+ScaledBaseHeight-1)/16
Can derive mbIdxX by using the macroblock number on macroblock address and the horizontal direction.Can be by application macro block adaptive frame-field (macroblock adaptive frame-field) and derive mbIdxY with diverse ways according to whether.For instance, if used macro block adaptive frame-field, can be by considering that macro block is to deriving mbIdxY.When consider macro block to the time, suppose that the index of top macro block is set to mbIdxY0, the index of bottom macro block is set to mbIdxY1.MbIdxY0 can derive from the image after expression is used for the up-sampling of inter-layer prediction and the offset information of the upper position difference between the present image and the macroblock number information of horizontal direction.In this situation, the value of horizontal macroblock number information can be two field picture or field picture (field picture) and difference according to present image.MbIdxY1 can derive from the image after expression is used for the up-sampling of inter-layer prediction and the offset information of the upper position difference between the present image and the macroblock number information on the vertical direction.Simultaneously, if there is not application macro block adaptive frame-field, mbIdxY0 can be set to identical value with mbIdxY1.
ScaledBaseLeftOffset represents offset information, and its expression is used for the image behind the up-sampling of inter-layer prediction and the position difference in the left side between the present image.ScaledBaseTopOffset is used for the image behind the up-sampling of inter-layer prediction and the position difference of the top between the present image for expression.ScaledBaseWidth represents the horizontal width of the image behind the up-sampling.And ScaledBaseHeight represents the vertical height of the image behind the up-sampling.
If the ungratified words of each in the above-mentioned condition, function in_crop_window () can return one " FALSE " (or " 0 ") value.
When corresponding to the pixel of at least one pixel in the current block not in the basic layer behind up-sampling the time, that is to say, when function in_crop_window (CurrMbAddr) returns " FALSE " value, the information that is associated with inter-layer prediction is not used to current block, and this information can not be transmitted.Therefore, according to embodiments of the invention,, can omit the transmission of Information relevant with the inter-layer prediction that is used for current block if identify non-existent words of respective regions in the basic layer by in_crop_window (CurrMbAddr).
According to embodiments of the invention, the following describes by using function in_crop_window () to carry out the situation of coding.
At first, when identifying zone corresponding to current block by in_crop_window (CurrMbAddr) and be present in the basic layer, enhancement layer coding unit 106 is by using the texture and/or the movable information inter-layer prediction of basic layer.Under this situation, movable information can comprise reference index information, and motion vector information is cut apart (partition) information etc.
When texture that is set to relevant block at the texture and/or the movable information of current block and/or movable information, or be when the texture of relevant block and/or movable information are derived at the texture of current block and/or movable information, enhancement layer coding unit 106 joins indication indication information complete or derived information in the data flow of enhancement layer, and this adding is notified to decoder 110.But when identifying zone corresponding to current block by in_crop_window (CurrMbAddr) and be not present in basic layer, enhancement layer coding unit 106 is inter-layer prediction and produce enhancement layer not.Simultaneously, if when decoder 110 confirms that by in_crop_window (CurrMbAddr) zone corresponding to current block is not present in basic layer, indication information is not transmitted in decoder 110 decisions.
Fig. 5 is respectively the macro block syntax graph relevant with sub-macroblock prediction according to an embodiment of the invention and by inter-layer prediction with Fig. 6.
When inter-layer prediction, be transferred to decoder with the relevant information of inter-layer prediction of the strip data of current NAL.For example in fact, in the prediction of the motion vector of the current block of enhancement layer, can obtain the sign (motion_prediction_flag_lx) whether expression use the motion vector of basic layer from macroblock layer.According to one embodiment of present invention, decoder learns in the mode of checking in_crop_window (CurrMbAddr) whether the information that is associated with inter-layer prediction transmits (510,610) by encoder.For example in fact, according to in_crop_window (CurrMbAddr), if be not present in basic layer corresponding to the zone of current block, sign motion_prediction_flag_10/11 will can not transmit (520/530,620/630) in bit stream.
And whether expression and the information that is associated of motion vector prediction are present in the sign adaptive_motion_prediction_flag of macroblock layer can be obtained from the strip data of current NAL.According to one embodiment of present invention, by checking the mode of adaptive_motion_prediction_flag and in_crop_window (CurrMbAddr), encoder can not transmit the information (510) that is associated with inter-layer prediction.For example in fact, according to in_crop_window (CurrMbAddr), if the zone corresponding to current block is not present in basic layer, perhaps according to adaptive_motion_prediction_flag, if and the information that motion vector prediction is associated is not present in macro block, can not transmit sign motion_prediction_flag_10/11 (520/530,620/630).Above-mentioned technological thought can be applicable to the sub-macroblock prediction shown in Fig. 6 equally.
Therefore, if after the above-mentioned two kinds of information of identification, satisfy above-mentioned two conditions, the information that transmission and inter-layer prediction are associated.Therefore, can improve code efficiency.
Fig. 7 is the relevant syntax graph of residual prediction according to an embodiment of the invention and by inter-layer prediction.
In the situation of inter-layer prediction, the information relevant with inter-layer prediction in the strip data of current NAL is transferred to decoder.For instance, in the situation of the residual signals of predicting current block, can obtain the sign residual_prediction_flag (740) whether expression use the residual signals of basic layer from macroblock layer.Under this situation, can know basic layer by layer expression information (layer representation information).According to one embodiment of present invention, by confirming the mode of in_crop_window (CurrMbAddr), encoder can not transmit the information relevant with inter-layer prediction.
For example in fact, can obtain above-mentioned residual_prediction_flag (710) according to the information of the type of strip of the information adaptive_residual_prediction_flag of expression existence of the information relevant in the macro block and current block with the prediction of residual signals.Above-mentioned residual_prediction_flag also can be obtained according to base_mode_flag.Above-mentioned base_mode_flag represents whether the type (mb_type) of current macro is derived (720) from the respective regions of basic layer.Also can obtain residual_prediction_flag according to the type and the function in_crop_window (CurrMbAddr) of current macro.For example in fact, when the type of macro block and sub-macro block is not frame mode (MbPartPredType (mb_type, 0)!=Intra_16 x 16 (8 x, 8 and, 4 x 4)), and (its expression is present in the basic layer corresponding to the zone of current macro) can obtain residual_prediction_flag (730) when the value of in_crop_window (CurrMbAddr) was " true ".If the type of current macro is not a frame mode or when not being present in basic layer (in_crop_window (CurrMbAddr)=0) corresponding to the zone of current macro, do not carry out residual prediction.And above-mentioned encoder 102 generates enhancement layer and does not comprise residual_prediction_flag.
If above-mentioned residual_prediction_flag is set to 1, then predict the residual signals of current block from the residual signals of basic layer.If residual_prediction_flag is set to 0, then do not carry out inter-layer prediction and the coded residual signal.If there is not residual_prediction_flag in macroblock layer, it can be by according to hereinafter deriving.In fact, have only when satisfying following condition fully for example, residual_prediction_flag can be derived as preset value (default_residual_prediction_flag).At first, base_mode_flag should be set to 1 or the type of current macro should not be frame mode.Secondly, in_crop_window (CurrMbAddr) should be set to 1.The 3rd, whether expression uses the sign no_inter_layer_pred_flag of inter-layer prediction should be set to 0.The 4th, type of strip should not be the EI band.Otherwise, derivation draws 0.
By in_crop_window (CurrMbAddr), when confirming that zone corresponding to the current sequence piece is not present in the basic layer, enhancement layer decoder unit 116 decision motion prediction sign (motion_prediction_flag) information are not present in macro block or the sub-macro block, and only come the reconstruction video signal and do not carry out inter-layer prediction by the data bit flow that uses enhancement layer.If the syntactic element that is used for residual prediction is not included in the data bit flow of enhancement layer, residual prediction flag residual_prediction_flag can be derived in enhancement layer decoder unit 116.When so carrying out, can consider whether be present in the basic layer by in_crop_window (CurrMbAddr) corresponding to the zone of current block.If in_crop_window (CurrMbAddr) is for to be set to 0, enhancement layer decoder unit 116 can be confirmed not to be present in the basic layer corresponding to the zone of current sequence piece.In this case, deriving residual_prediction_flag is 0, and can only not carry out residual prediction by the residual signals that uses basic layer by the data reconstruction video signal that uses enhancement layer then.
Fig. 8 is whether basis according to an embodiment of the invention exists inter-layer prediction to carry out the syntactic structure figure of block elimination filtering.
At first, according to one embodiment of present invention, encoder can not transmit the information relevant with inter-layer prediction by the configuration information of the bit stream behind the inspection scalable video.The configuration information of the bit stream behind the scalable video can obtain from the extended area of NAL head.For example in fact, can whether use the information (no_inter_layer_pred_flag) of inter-layer prediction to obtain the information relevant (810) according to expression with de-blocking filter with quality identification information (quality_id).Example as the information relevant with the operation of de-blocking filter, the information (disable_deblocking_filter_idc) that the method for operation of expression de-blocking filter can be arranged, the required offset information of block elimination filtering (slice_alpha_c0_offset_div2, slice_beta_offset_div2) etc.
At first, can obtain to represent the information of the operation of de-blocking filter based on the information of the characteristic that is used to control de-blocking filter.In this case, mentioned as the description of Fig. 2, the information that is used for controlling the characteristic of de-blocking filter can obtain from the extended area of sequence parameter set.For example in fact, as the information of the characteristic that is used to control de-blocking filter, the flag information (inter_layer_deblocking_filter_control_present_flag) (820) whether the information of characteristic that can have expression control to be used for the de-blocking filter of inter-layer prediction exists.Therefore, can obtain the information (830) of the method for operation of expression de-blocking filter according to above-mentioned flag information.
Particularly, if disable_deblocking_filter_idc equals 0, can carry out filtering for all block edges of the luminance and chrominance information of present image so.If disable_deblocking_filter_idc equals 1, can all block edges of present image not carried out filtering.Disable_deblocking_filter_idc equals 2, then all block edges outside the block edge with overlapping band boundaries is carried out filtering.If disable_deblocking_filter_idc equals 3, then the block edge of overlapping band boundaries carries out filtering to having not, and then the block edge with overlapping band boundaries is carried out filtering.If disable_deblocking_filter_idc equals 4, only the block edge of luminance signal is carried out filtering and can the block edge of carrier chrominance signal do not carried out filtering.If disable_deblocking_filter_idc equals 5, then all block edges to the luminance signal outside the block edge with overlapping band boundaries carry out filtering, and can the block edge of carrier chrominance signal not carried out filtering.If disable_deblocking_filter_idc equals 6, can be not the block edge of carrier chrominance signal not be carried out filtering, but can be only carry out filtering the block edge of luminance signal.When for having after the block edge of the luminance signal of overlapping band boundaries does not carry out filtering, can carry out filtering to the block edge of luminance signal with overlapping band boundaries.
Information based on the method for operation of representing de-blocking filter can obtain the required offset information of block elimination filtering.For instance, if disable_deblocking_filter_idc equals 1, all block edges are not carried out block elimination filtering.Therefore, have only when the value of disable_deblocking_filter_idc is not set to 1, could obtain the necessary offset information of block elimination filtering (840).Employed offset information (850) when for example in fact, in macro block, visiting the de-blocking filter table when inter_layer_slice_alpha_c0_offset_div2 and inter_layer_slice_beta_offset_div2 can be meant inter-layer prediction.Therefore, can carry out block elimination filtering by using the offset information that is obtained.
Fig. 9 is whether basis according to an embodiment of the invention exists inter-layer prediction to obtain to represent the syntactic structure figure of the offset information of reference picture behind the up-sampling and the position difference between present image.
According to one embodiment of present invention, encoder can pass through to check the configuration information of scalable-video-coded bit stream, and does not transmit the information relevant with inter-layer prediction.The configuration information of scalable-video-coded bit stream can obtain from the extended area of NAL head.For instance, can whether use the information (no_inter_layer_pred_flag) of inter-layer prediction and the information (910) that quality identification information (quality_id) obtained and be used for the parameter correlation of up-sampling process according to expression.As with the example of the information of the parameter correlation that is used for the up-sampling process, have information (930), the offset information of the position difference between presentation video (940) etc. about the phase shift of carrier chrominance signal.And, the information that can obtain and be used for the parameter correlation of up-sampling process from the extended area and the slice header of sequence parameter set.
As example about the information (930) of the phase shift of carrier chrominance signal, existence is about the information (ref_layer_chroma_phase_x_plus1) of the horizontal phase shift of the chromatic component of the image that is used for inter-layer prediction, about the information (ref_layer_chroma_phase_y_plus1) of its vertical phase change.Example as the offset information (940) of the position difference between presentation video, there is offset information (scaled_ref_layer_left_offset, scaled_ref_layer_top_offset, scaled_ref_layer_right_offset, scaled_ref_layer_bottom_offset), its expression be used for image behind the up-sampling of inter-layer prediction and the left side between present image,, the right side and bottom position difference.
Can obtain and be used for the information of the parameter correlation of up-sampling process based on the information (extended_spatial_scalability) of position of information that expression is used for the relating to parameters of up-sampling process.For example in fact, if above-mentioned extended_spatial_scalability is set to 0, the information that can represent and be used for the parameter correlation of up-sampling process so neither is present in the concentrated slice header that also is not present in of sequential parameter.If extended_spatial_scalability is set to 1, the information that can represent and be used for the parameter correlation of up-sampling process is not present in slice header, concentrates but be present in sequential parameter.If extended_spatial_scalability is set to 2, the information that can represent and be used for the parameter correlation of up-sampling process is not present in sequential parameter to be concentrated, but is present in the slice header.Therefore, if extended_spatial_scalability is set to 2, information (920) in can control strip taking the lead and that be used for the parameter correlation of up-sampling process.And, if extended_spatial_scalability is set to 1, information in then can the control sequence parameter set and that be used for the parameter correlation of up-sampling process.
About the information (930) of the phase shift of carrier chrominance signal, and the offset information (940) of the position difference between expression reference picture and present image is used to the up-sampling process.
Figure 10 is whether basis according to an embodiment of the invention exists inter-layer prediction to obtain the syntactic structure figure whether expression is limited in the flag information of the interior piece (intra-block) of use frame in the basic layer.
According to one embodiment of present invention, by checking the configuration information of scalable-video-coded bit stream, encoder can not transmit the information relevant with inter-layer prediction.The configuration information of above-mentioned scalable-video-coded bit stream can obtain from the extended area of NAL head.For example in fact, can whether use the information (no_inter_layer_pred_flag) of inter-layer prediction and quality identification information (quality_id) to obtain to represent the information (1010) of the processing of the band boundaries in the up-sampling process according to expression.The example of information as the processing of expression band boundaries exists expression whether to limit the information (constrained_intra_resampling_flag) of piece in the frame that uses in the basic layer for the current block in the enhancement layer.Whether limit the information of using piece in the frame by the definition expression, can improve the decoding speed when carrying out parallel processing.Can obtain expression from slice header and whether limit the information of using piece in the frame.
Because can obtain the information whether expression limits the use of piece in the frame,, need also to check whether the reference block with the corresponding basic layer of current block is included in the particular bands of basic layer even its value is set to 1 from slice header.Therefore, when constrained_intra_resampling_flag is set to 1, can confirm whether be included in the particular bands of basic layer with the reference block of the corresponding basic layer of current block.For example in fact, when at least two bands in basic layer reference block and the basic layer overlapped mutually, current block was marked as in basic layer and does not use piece in the frame.Particularly, can not be by using fundamental forecasting pattern (the intra-base prediction mode) current block of encoding in the frame.The fundamental forecasting pattern can represent to predict based on the respective regions of basic layer the pattern of the current block of enhancement layer in the frame.Under this situation, the respective regions of basic layer is represented the piece with the frame mode coding.When the respective regions of basic layer is incorporated into the particular bands of basic layer, can be by the interior piece (intra-block) of the frame that the uses basic layer current block of decoding.Under this situation, current block can be marked as the fundamental forecasting pattern (intra-base prediction mode) in the frame of having used.
If above-mentioned constrained_intra_resampling_flag is set to 1, then represent to be restricted with reference to the information (disable_deblocking_filter_idc) of the method for operation of the described de-blocking filter of Fig. 8.In fact, disable_deblocking_filter_idc can only be set to 1,2 or 4 for example.
If above-mentioned constrained_intra_resampling_flag is set to 0, even at least two bands in relevant block in the basic layer and the basic layer overlap mutually, also can use piece (intra-block) in the frame of basic layer to come the current block of decoding enhancement layer.
Embodiment described above goes for carrier chrominance signal, also is applicable to luminance signal according to same way as equally.
Figure 11 is according to an embodiment of the invention being used for according to whether existing inter-layer prediction to obtain the syntax graph of adaptive prediction information.
According to one embodiment of present invention, by confirming the configuration information of scalable-video-coded bit stream, encoder can not transmit the information relevant with inter-layer prediction.Can obtain the configuration information of scalable-video-coded bit stream from the extended area of NAL head.For example in fact, can whether use the information no_inter_layer_pred_flag of inter-layer prediction to obtain adaptive prediction information (1110) based on expression.Adaptive prediction information can represent whether be present in the relevant position with the relevant grammer of prediction.For example, exist expression and the relevant grammer of prediction whether to be present in the information adaptive_prediction_flag of slice header and macroblock layer, represent whether the grammer relevant with motion prediction is present in the information adaptive_motion_prediction_flag of macroblock layer, whether the grammer relevant with residual prediction with expression is present in the information adaptive_residual_prediction_flag of macroblock layer, or the like.
When whether using the information of inter-layer prediction to come inter-layer prediction, at first can obtain to represent whether to exist the flag information slice_skip_flag (1120) of strip data according to expression.By confirming that there is the information of strip data in expression,, can determine whether to derive the information in the macro block for inter-layer prediction.Information according to the existence of representing above-mentioned strip data if strip data is present in (1130) in the band, can obtain adaptive prediction sign adaptive_prediction_flag (1140).And, can obtain to represent whether the grammer relevant with residual prediction is present in the information adaptive_residual_prediction_flag of macroblock layer (1180).According to above-mentioned adaptive prediction sign, can obtain expression from the relevant block of basic layer and how derive and represent the information default_base_mode_flag (1150) of information such as predicted motion information whether.When movable information etc. when not being predicted the obtaining of relevant block from basic layer (1155), can obtain to represent whether the grammer relevant with motion prediction is present in the information adaptive_motion_prediction_flag (1160) in the macroblock layer.If the grammer relevant with motion prediction is not present in macroblock layer (1165), can obtain to represent how to infer the information default_motion_prediction_flag (1170) of motion prediction flag information.
The information adaptive_residual_prediction_flag that can whether be present in macroblock layer at the information adaptive_motion_prediction_flag grammer relevant with residual prediction that macroblock layer uses the expression grammer relevant with motion prediction whether to be present in macroblock layer with expression.For example, can obtain the sign motion_prediction_flag_lx whether expression uses the motion vector of basic layer based on above-mentioned adaptive_motion_prediction_flag.And, can obtain the sign residual_prediction_flag whether expression uses the residual signals of basic layer based on above-mentioned adaptive_residual_prediction_flag.
As indicated above, can be applicable to decoder/encoder of the present invention and be provided to the broadcast transmitter/receiver that is used for such as the multimedia broadcasting of DMB (DMB) etc., to be used for decoded video signal, data-signal etc.And above-mentioned multimedia broadcasting emittor/receiver can comprise mobile communication terminal.
A kind of application decoding/coding method of the present invention is reserved as the program that computer is carried out, and is stored in the computer readable recording medium storing program for performing.And the multi-medium data with data structure of the present invention can be stored in the computer readable recording medium storing program for performing.Computer readable recording medium storing program for performing comprises all types of memory devices that are used for storage computation machine system readable data.Computer readable recording medium storing program for performing comprises ROM, RAM, CD-ROM, tape, floppy disk, optical disc memory apparatus etc., and comprises the equipment realized by the carrier wave transmission of internet (for example, by).And, be stored in the computer-readable medium or by the bit stream that coding method generated and be transmitted by wired.
Industrial applicibility
Although the present invention is described and illustrates that clearly those skilled in the art can carry out various modifications and variation to it, and does not break away from spirit of the present invention or category with reference to its preferred embodiment.Therefore, modification of the present invention and the variation of providing in the scope of claims and equivalent thereof is provided in the present invention.
Claims (11)
1, a kind of method of decoded video signal, described method comprises:
The bit stream of decoding ground floor;
Obtain expression whether to the flag information of the current block inter-layer prediction of the second layer;
Obtain at least one offset information based on described flag information, described offset information represents to be used for the position difference between the present image of the image behind the up-sampling of described ground floor of described inter-layer prediction and the described second layer; With
By using described at least one offset information, the reference picture of described ground floor is carried out up-sampling.
2, method according to claim 1, further comprise: obtain the information whether parameter that expression is used for up-sampling is present in the respective regions of the described second layer, wherein, whether the parameter that is used for up-sampling based on described expression is present in the information of the respective regions of the described second layer, obtains described at least one offset information.
3, method according to claim 2, further comprise: whether the parameter that is used for up-sampling based on described expression is present in the information of the respective regions of the described second layer, acquisition is about the information of the phase shift of carrier chrominance signal, wherein, by using the information of described phase shift about carrier chrominance signal, described ground floor is sampled.
4, method according to claim 3 wherein, based on the information of expression chroma format, obtains the information of described phase shift about carrier chrominance signal.
5, method according to claim 3, wherein, the information of described phase shift about carrier chrominance signal comprises phase shift information on the horizontal direction and the phase shift information on the vertical direction.
6, method according to claim 2 further comprises: obtain to be used to discern the quality identification information of quality of the current block of the described second layer, wherein, obtain described offset information based on described quality identification information.
7, method according to claim 1, wherein, the screen proportion or the spatial resolution of the described second layer and described ground floor are different, and described ground floor comes from the same video signal of the described second layer.
8, a kind of device that is used for decoded video signal, described device comprises:
Basic layer decoder unit, the bit stream of the ground floor that is used to decode;
First header obtains the unit, whether is used to obtain to represent the flag information to the current block inter-layer prediction of the second layer;
Second header obtains the unit, be used for obtaining at least one offset information based on described flag information, described offset information represents to be used for the position difference between the present image of the image behind the up-sampling of described ground floor of described inter-layer prediction and the described second layer; With
The up-sampling unit is used for by using described at least one offset information, and the reference picture of described ground floor is carried out up-sampling.
9, method according to claim 1, wherein, described vision signal is received with broadcast singal.
10, method according to claim 1, wherein, described vision signal is received by Digital Media.
11, a kind of computer-readable medium has write down the program that enforcement of rights requires 1 method on it.
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| Publication number | Publication date |
|---|---|
| CN101395921B (en) | 2012-08-22 |
| CN101395921A (en) | 2009-03-25 |
| CN101401430A (en) | 2009-04-01 |
| CN101401430B (en) | 2012-02-29 |
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