CN103826127A - Moving image coding device and moving image coding method - Google Patents
Moving image coding device and moving image coding method Download PDFInfo
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Abstract
The invention provides a moving image coding device, which is used for performing motion compensation predictive coding to a moving image. The device comprises an acquisition part, a selection part, a selection information coding part and an image coding part, wherein the acquisition part is used for obtaining available blocks with motion vectors and the number of the available blocks from coded blocks adjacent to the coding object block; the selection part is used for selecting a selected block from the coded blocks, namely the available blocks; the selection information coding part is used for coding the selected information determining the selected block by using a code tablet corresponding to the number of the available blocks; the image coding part is used for performing motion compensation predictive coding to the coding object block by using the motion vector of the selected block.
Description
The application's application number that to be same applicant submit on June 18th, 2009 is 200980159915.4(PCT/JP2009/061130), the divisional application of the denomination of invention Chinese patent application that is " dynamic image encoding device and moving image decoding apparatus ".
Technical field
The present invention relates to obtain motion vector and carry out dynamic image encoding device and the moving image decoding apparatus of compensation prediction according to coding and the complete image of decoding.
Background technology
One of technology using in coding as moving image, has motion compensated prediction.In motion compensated prediction, in dynamic image encoding device, use the coded object image of the new coding of hope and the local decoder image having obtained to obtain motion vector, and use this motion vector to carry out motion compensation, thus generation forecast image.
As obtain one of method of motion vector in motion compensated prediction, there is the motion vector that uses the coded object piece of deriving from the motion vector of the complete piece of encoding, the Direct Model of generation forecast image (with reference to No. 7233621st, No. 4020789th, Japan Patent and United States Patent (USP)).In Direct Model, motion vector is not encoded, so can cut down the size of code of motion vector information.In H.264/AVC, adopt Direct Model.
Summary of the invention
In Direct Model, in the time that prediction generates the motion vector of coded object piece, by according to and the method being fixed of the median calculating kinematical vector of the motion vector of the complete piece of the coding of coded object piece adjacency generate motion vector.Therefore, the degree of freedom of motion vector computation is low.In addition, in the case of having used in order to improve the above-mentioned degree of freedom from selecting the complete piece of multiple codings the computational methods of motion vector of 1, for represent selected go out the complete piece of coding, must be all the time select information using the position of this piece as motion vector and send.Therefore, cause size of code to increase.
The object of the present invention is to provide a kind of dynamic image encoding device and moving image decoding apparatus, from the complete piece of encoding, select 1 and improve the degree of freedom of motion vector computation, and cut down motion vector and select the additional information of information.
A mode of the present invention provides a kind of dynamic image encoding device, moving image is carried out to motion compensated predictive coding, this dynamic image encoding device possesses: obtaining section, from the piece complete with the coding of coded object piece adjacency, obtain as available and the quantity of described available of piece with motion vector; Selection portion, from selecting 1 to select piece as the described available of complete piece of coding; Select information coding portion, use the code table corresponding with the quantity of described available, the selection information of determining described selection piece is encoded; And Image Coding portion, use the motion vector that described selection piece has to carry out motion compensated predictive coding to described coded object piece.
Another way of the present invention provides a kind of moving image decoding apparatus, moving image is carried out to motion compensated prediction decoding, this moving image decoding apparatus possesses: select information decoding portion, according to as with decoder object piece in abutting connection with and there is the quantity switch code table of available of the decoding block of motion vector, selection information is decoded; Motion vector selection portion is selected by 1 motion vector shown in the selection information of having decoded by described selection information decoding portion from described available; And image decoding portion, use the motion vector of being selected by described motion vector selection portion, decoder object image is carried out to motion compensated prediction decoding.
Accompanying drawing explanation
Fig. 1 is the block diagram of the dynamic image encoding device of embodiments of the present invention.
Fig. 2 is the flow chart that the treatment step of dynamic image encoding device is shown.
Fig. 3 is the flow chart that the treatment step of obtaining section/selection portion is shown.
Fig. 4 A is the figure of the method for discrimination of explanation based on piece size.
Fig. 4 B is the figure of the method for discrimination of explanation based on piece size.
Fig. 4 C is the figure of the method for discrimination of explanation based on piece size.
Fig. 5 is the figure of the method for discrimination of explanation based on unidirectional or bi-directional predicted.
Fig. 6 is the flow chart that the treatment step of selecting information coding portion is shown.
Fig. 7 is an example of the index of selection information.
Fig. 8 is an example of the code table of selection information.
Fig. 9 is the summary of syntactic constructs.
Figure 10 is the data configuration of macroblock layer.
Figure 11 is the block diagram of the moving image decoding apparatus of embodiments of the present invention.
Figure 12 is the flow chart that the treatment step of moving image decoding apparatus is shown.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
With reference to Fig. 1, the dynamic image encoding device of an execution mode is described.Subtracter 101 is configured to difference the prediction of output error signal 12 of calculating input motion picture signal 11 and prediction image signal 15.The output of subtracter 101 is connected to variable length coder 111 via quadrature transformer 102 and quantizer 103.Quadrature transformer 102 carries out orthogonal transform to the predictive error signal 12 from subtracter 101, generating orthogonal conversion coefficient, and quantizer 103 quantizes orthogonal transform coefficient, output quantization orthogonal transform coefficient information 13.Variable length coder 111 carries out variable length code to the quantification orthogonal transform coefficient information 13 of carrying out quantizer 103.
The output of quantizer 103 is connected to adder 106 via inverse quantizer 104 and inverse orthogonal transformation device 105.Inverse quantizer 104 carries out re-quantization to quantizing orthogonal transform coefficient information 13, is transformed to orthogonal transform coefficient.Orthogonal transform coefficient is transformed to predictive error signal by inverse orthogonal transformation device 105.Predictive error signal and the prediction image signal 15 of adder 106 to inverse orthogonal transformation device 105 carries out add operation, generates local decoder picture signal 14.The output of adder 105 is connected to motion compensated predictor 108 via frame memory 107.
With reference to the flow chart of Fig. 2, the effect of the dynamic image encoding device of said structure is described.
First, generation forecast error signal 12(S11).In the generation of this predictive error signal 12, select motion vector, use selected go out motion vector generation forecast image.The signal that calculates this predicted picture by subtracter 101 is the difference of prediction image signal 15 and input motion picture signal 11, thus generation forecast error signal 12.
By quadrature transformer 102, predictive error signal 12 is implemented to orthogonal transform, generating orthogonal conversion coefficient (S12).By quantizer 103, orthogonal transform coefficient is quantized to (S13).By inverse quantizer 104, the orthogonal transform coefficient information after quantizing is carried out to re-quantization (S14), afterwards, carry out inverse orthogonal transformation by inverse orthogonal transformation device 105, obtain the predictive error signal (S15) of regeneration.In adder 106, by predictive error signal and the prediction image signal 15 of regeneration are carried out to add operation, generate local decoder picture signal 14(S16).Local decoder picture signal 14 is saved to frame memory 107(as with reference to image) (S17), the local decoder picture signal of reading from frame memory 107 is imported into motion compensated predictor 108.
The fallout predictor 109 of motion compensated predictor 108 uses motion vector 16 local decoded image signal (with reference to image) to be carried out to motion compensated prediction, generation forecast picture signal 15.In order to obtain and the difference of input motion picture signal 11, prediction image signal 15 is sent to subtracter 101, and then is also sent to adder 106 in order to generate local decoder picture signal 14.
Obtaining section/selection portion 110 is selected 1 motion vector using in motion compensated prediction from adjacent block, by selected go out motion vector 16 send to fallout predictor 109, generate selection information 17.Selection information 17 is sent to the information coding portion 112 of selecting.Select motion vector from adjacent block time, can select size of code such applicable motion vector that diminishes.
Orthogonal transform coefficient information 13 after being quantized by quantizer 103 is also input to variable length coder 111, implements variable length code (S18).From obtaining section/selection portion 110, the selection information 16 using in output movement compensation prediction, and be input to the information coding portion 112 of selecting.In selection information coding portion 112, using in code table, have with as with coded object piece in abutting connection with and there is the mode switch code table of the record of the quantity that the quantity of available of the complete piece of the coding of motion vector equates, selection information 17 is carried out to variable length code.By multiplexer 113, the quantification orthogonal transform coefficient information from variable length coder 111 and selection information are carried out multiplexing, the bit stream (S19) of outputting encoded data 18.Coded data 18 is sent not shown saved system or transfer path.
In the flow chart of Fig. 2, the flow process of the flow process of step S14～S17 and step S18 and S19 can be replaced.That is, can follow quantization step S13 and carry out variable length code step S18 and multiplexing step S19, and multiplexing step S19 is carried out to re-quantization step S14～storing step S17.
Next, use the flow chart shown in Fig. 3, the effect of obtaining section/selection portion 110 is described.
First, reference frame memory 107, search and coded object piece adjacency, as the available candidate (S101) with the complete piece of the coding of motion vector.If search available candidate, differentiate the piece size (S102) of the motion compensated prediction of these available candidate.Next, differentiating available candidate is unidirectional or bi-directional predicted (S103).According to the predictive mode of differentiating result and coded object piece, from available candidate, extract available out.From extracted out available, select 1 and select piece, obtain and determine and select the information of piece as selection information (S104).
Next, with reference to Fig. 4 A～4C, the differentiation of illustrated block size (S102).
The adjacent block using in present embodiment is the piece of the left side that is positioned at coded object piece coded object piece, upper left, upper, upper right.Therefore, the upper left that is positioned at frame at coded object piece, due to not with available of coded object piece adjacency, so cannot be to this coded object piece application the present invention.Upper end at coded object piece in picture, available is only 1 of left side, is the left end of picture and not right-hand member at coded object piece, these 2 of available upper, upper rights that becomes coded object piece.
In the situation that macroblock size is 16 × 16 size, the piece size of the motion compensated prediction of adjacent block is shown with these 4 kinds of 16 × 16 sizes, 16 × 8 sizes, 8 × 16 sizes, 8 × 8 sizes as Fig. 4 A～4C.In the time having considered these 4 kinds, the adjacent block that can become available is 20 kinds such shown in Fig. 4 A～4C., under 16 × 16 sizes shown in Fig. 4 A, be 4 kinds, under 16 × 8 sizes shown in Fig. 4 B and 8 × 16 sizes, be 10 kinds, under the 8x8 size shown in Fig. 4 C, be 6 kinds.In the differentiation (S102) of piece size, from this piece of 20 kinds, search for available according to piece size.For example, in the case of the size of available being made as only 16 × 16, available that under this piece size, determines is 4 kinds of pieces of 16 × 16 sizes as shown in Figure 4 A., available is piece, the piece in left side of coded object piece and the piece of the upper right side of coded object piece of the upside of piece, the coded object piece of the upper left side of coded object piece.In addition, be extended to situations more than 16 × 16 sizes for macroblock size, being also 16 × 16 sizes with macroblock size, situation similarly can obtain available.For example, in the situation that macroblock size is 32 × 32 size, the piece size of the motion compensated prediction of adjacent block has these 4 kinds of 32 × 32 sizes, 32 × 16 sizes, 16 × 32 sizes, 16 × 16 sizes, and the adjacent block that can become available is 20 kinds.
Next,, with reference to Fig. 5, enumerate example the unidirectional or bi-directional predicted differentiation (S103) of being undertaken by obtaining section/selection portion 110 is described.
For example, be 16 × 16 by piece size restrictions, for coded object piece, the piece of adjacency unidirectional or bi-directional predicted is situation as shown in Figure 5.In unidirectional or bi-directional predicted differentiation (S103), search for available according to the direction of prediction.For example, the adjacent block that comprises prediction direction L0 is made as to available that in prediction direction, determines., shown in Fig. 5 (a), coded object piece upper, left and right on piece become available that in prediction direction, determines.In this case, do not use the piece of the upper left of coded object piece.If the adjacent block that comprises prediction direction L1 is made as to available that determines by Forecasting Methodology, shown in Fig. 5 (b), the upper left of coded object piece and the piece of upside become available that in prediction direction, determines.In this case, do not use the piece of a left side and the upper right of coded object piece.If the adjacent block that comprises prediction direction L0/L1 is made as to available that determines by Forecasting Methodology, only the piece of upside shown in Fig. 5 (c), coded object piece becomes available that in prediction direction, determines.In this case, do not use the piece of a left side, upper left and the upper right of coded object piece.In addition, prediction direction L0(L1) corresponding to the prediction direction of the L0 prediction (L1 prediction) in AVC.
Next,, with reference to the flow chart shown in Fig. 6, the information coding portion 112 of selecting is described.
From with the adjacent block of coded object piece adjacency, search is as available of the complete piece of the coding with motion vector, the available block message (S201) of obtaining piece size and determining in unidirectional or bi-directional predicted.Use this available block message, carry out the switching (S202) of code table corresponding to the quantity with available as shown in Figure 8.Use the code table after switching, the selection information 17 sending from obtaining section/selection portion 110 is carried out to variable length code (S203).
Next,, with reference to Fig. 7, an example of the index of selection information is described.
In the situation that there is no as shown in Figure 7 (a) available, the present invention can not be applied to this piece, so do not send selection information.At available be 1 in the situation that as shown in Figure 7 (b) shows, the motion vector of available using in the motion compensation of coded object piece is determined uniquely, so do not send selection information.At as shown in Fig. 7 (c) available be 2 in the situation that, send the selection information of index 0 or 1.At as shown in Fig. 7 (d) available be 3 in the situation that, send the selection information of index 0,1 or 2.At as shown in Fig. 7 (e) available be 4 in the situation that, send the selection information of index 0,1,2 or 3.
In addition, as an example of the addition method of the index of available, according to the order of a left side for coded object piece, upper left, upper, upper right, to available example that has added index as shown in Figure 7., remove the piece that do not use and to the continuous additional index of used piece.
Next,, with reference to Fig. 8, the code table of selection information 17 is described.
In selection information coding portion 112, carry out the switching (S202) of code table according to the quantity of available.As mentioned above, need to encode to selection information 17 to be available be 2 above situations.
First, in the situation that being 2 for available, index needs 0 and 1, and code table becomes the table shown in the left side of Fig. 8.In the situation that being 3 for available, index becomes 0,1,2, and code table becomes the table shown in the central authorities of Fig. 8.In the situation that being 4 for available, index needs 0,1,2,3, and code table becomes the table shown in the right side of Fig. 8.According to the quantity of available, switch these code tables.
Next, the coding method of selection information is described.
Fig. 9 illustrates the summary of the structure of the grammer using in the present embodiment.Grammer is mainly made up of 3 parts, High Level Syntax801(high-level syntax) be received in the syntactic information of the above upper layer of section.At Slice Level Syntax804(slice-level grammer) in, there is required information for the bright note of each section, at Macroblock Level Syntax807(macro-block level grammer) in, error signal, the pattern information etc. after required variable length code had for the bright note of each macro block.
These syntaxes are respectively by more detailed Grammatical composition, in High Level Syntax801, by Sequence parameter set syntax(time sequence parameter group grammer) 802 and Picture parameter set syntax(image parameters group grammer) Grammatical composition of the sequences such as 803, picture level.In Slice Level Syntax804, by a Slice header syntax(section grammer) 405, Slice data syntax(slice of data grammer) formations such as 406.And then Macroblock Level Syntax807 is by macroblock layer syntax(macroblock layer grammer) 808, macroblock prediction syntax(macroblock prediction grammer) formations such as 809.
Required syntactic information is macroblock layer syntax808 in the present embodiment, below syntax of declaration.
The available_block_num of Figure 10 (a) shown in (b) represents the quantity of available, is 2 above in the situation that at it, need to select the coding of information.In addition, mvcopy_flag is illustrated in the mark that whether uses the motion vector of available in motion compensated prediction, be more than 1 and this mark is 1 in the situation that at available, can in motion compensated prediction, use the motion vector of available.And then mv_select_info represents selection information, code table is described above.
Figure 10 (a) is illustrated in the syntax of the situation of after mb_type, selection information being encoded.In the situation that for example piece size is only 16 × 16, if mb_type is not 16 × 16, without mvcopy_flag and mv_select_info are encoded.If mb_type is 16x16, mvcopy_flag and mv_select_info are encoded.
Figure 10 (b) is illustrated in the grammer of the situation of before mb_type, selection information being encoded.If for example mvcopy_flag is 1, without mb_type is encoded.If mv_copy_flag is 0, mb_type is encoded.
In the present embodiment, for the scanning sequency of coding, can be arbitrarily sequentially.For example, can apply the present invention to line scanning, Z scanning etc.
With reference to Figure 11, the moving image decoding apparatus of other execution modes is described.
The coded data 18 of the dynamic image encoding device output from Fig. 1 is input to the inverse multiplexing device 201 of moving image decoding apparatus via saved system or transfer system as the coded data 21 of decoder object.201 pairs of coded datas of inverse multiplexing device (demultiplexer) 21 are carried out inverse multiplexing, and coded data 21 is separated into orthogonal transform coefficient information and the selection information of quantizing.The output of inverse multiplexing device 201 is connected to variable-length decoder 202.Variable-length decoder 202 is decoded to quantizing orthogonal transform coefficient information and selection information.The output of variable-length decoder 202 is connected to adder 206 via inverse quantizer 204 and inverse orthogonal transformation device 205.Inverse quantizer 204 carries out re-quantization to quantizing orthogonal transform coefficient information, is transformed to orthogonal transform coefficient.Inverse orthogonal transformation device 205 carries out inverse orthogonal transformation to orthogonal transform coefficient, is generated as predictive error signal.Predictive error signal is added to the prediction image signal from predicted picture maker 207 by adder 206, generates motion image signal.
With reference to the flow chart of Figure 12, the effect of the moving image decoding apparatus of said structure is described.
By inverse multiplexing device 201, coded data 21 is carried out to inverse multiplexing (S31), decode by variable-length decoder 202, generating quantification orthogonal transform coefficient information 22(S32).In addition, by selecting information decoding device 203, the state of the adjacent block of investigation and decoder object piece adjacency, according to the quantity of available of the complete piece of the coding of adjacency as thering is motion vector, with the selection information coding portion 112 of code device similarly, switch code table and decoding as shown in Figure 8.Thus, output selection information 23(S33).
Be sent to inverse quantizer 204 as orthogonal transform coefficient information 22 information of exporting from variable decoder 202, quantizing, as from select the information exported of information decoding portion 203, selection information 23 is sent to selection portion 209.
Carry out re-quantization (S34) by inverse quantizer 204 to quantizing orthogonal transform coefficient information 22, afterwards, carry out inverse orthogonal transformation (S35) by inverse orthogonal transformation device 205.Thus, obtain predictive error signal 24.In adder 206, predictive error signal 24 is added to prediction image signal, thus regeneration motion image signal 26(S36).The motion image signal 27 of regenerating is saved in frame memory 210(S37).
In predicted picture maker 207, use pass through decoded selection information 23 that select, as with decoder object piece in abutting connection with and there is the motion vector of available of both decoding blocks of motion vector, generation forecast image 26.In selection portion 209, the state of investigation adjacent block, according to the available block message of adjacent block with by selecting the selection information 23 that decodes of information decoding portion 203, with the obtaining section/selection portion 110 of code device similarly, from adjacent block, select the motion vector using in 1 motion compensated prediction.Use this motion vector 25 of selecting, by fallout predictor 208 generation forecast images 26, and in order to obtain motion image signal 27, predicted picture 26 is sent to adder 206.
According to the present invention, by the selection information corresponding with the quantity of available is encoded, can send selection information with applicable coding schedule, can cut down the additional information of selection information.
In addition, by the motion compensated prediction for coded object piece by the motion vector of available, can cut down the additional information relevant to motion vector information.
And then, 1 piece being applicable to from available selection by not fixing motion vector calculating method, than Direct Model, the degree of freedom of motion vector computation uprises.
The gimmick of the present invention that embodiments of the present invention are recorded can be carried out by computer, and, can also, as the program that can make computer carry out, be saved in the recording mediums such as disk (floppy disk, hard disk etc.), CD (CD-ROM, DVD etc.), semiconductor memory and issue.
In addition, the invention is not restricted to above-mentioned execution mode, can implementation phase in the scope that does not depart from its main idea, make inscape distortion and specialize.In addition, can, by the suitable combination of the disclosed multiple inscapes of above-mentioned execution mode, form various inventions.For example, also can from all inscapes shown in execution mode, delete several inscapes.And then, also can combine aptly the inscape of different execution modes.
Utilizability in industry
Image Compression during device of the present invention is used in communication, preserves and broadcasts.
Claims (5)
1. a dynamic image encoding device, carries out motion compensation encoding to moving image, and this device possesses:
Obtaining section, from the piece complete with the coding of coded object piece adjacency, obtains available and the quantity of described available with motion vector;
Selection portion is selected 1 piece from described available;
Select information coding portion, the selection information of determining selected is encoded, wherein, in the time that the quantity of available is 1, described selection information is not encoded;
Image Coding portion, is used the selected motion vector having, and described coded object piece is carried out to motion compensated predictive coding.
2. a dynamic image encoding method, carries out motion compensation encoding to moving image, and described method has:
From the piece complete with the coding of coded object piece adjacency, obtain available and the quantity of described available with motion vector;
From described available, select 1 piece;
The selection information of determining selected is encoded, wherein, in the time that the quantity of available is 1, described selection information is not encoded; And
Use the selected motion vector having, described coded object piece is carried out to motion compensated predictive coding.
3. a computer program, makes computer carry out motion compensation encoding to moving image, and described program is carried out described computer:
From the piece complete with the coding of coded object piece adjacency, obtain available and the quantity of described available with motion vector;
From described available, select 1 piece;
The selection information of determining selected is encoded, wherein, in the time that the quantity of available is 1, described selection information is not encoded; And
Use the selected motion vector having, described coded object piece is carried out to motion compensated predictive coding.
4. a dynamic image encoding device, carries out motion compensation encoding by carrying out following steps to moving image:
From the piece complete with the coding of coded object piece adjacency, obtain available and the quantity of described available with motion vector;
From described available, select 1 piece;
The selection information of determining selected is encoded, wherein, in the time that the quantity of available is 1, described selection information is not encoded; And
Use the selected motion vector having, described coded object piece is carried out to motion compensated predictive coding.
5. a dynamic image encoding method, carries out motion compensation encoding by carrying out following steps to moving image:
From the piece complete with the coding of coded object piece adjacency, obtain available and the quantity of described available with motion vector;
From described available, select 1 piece;
The selection information of determining selected is encoded, wherein, in the time that the quantity of available is 1, described selection information is not encoded; And
Use the selected motion vector having, described coded object piece is carried out to motion compensated predictive coding.
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| CN1449197A (en) * | 2002-03-29 | 2003-10-15 | Lg电子株式会社 | B image mode determining method and apparatus of video coding system |
| WO2006052577A2 (en) * | 2004-11-04 | 2006-05-18 | Thomson Licensing | Method and apparatus for fast mode decision of b-frames in a video encoder |
| CN1812586A (en) * | 2002-10-04 | 2006-08-02 | Lg电子株式会社 | Direct mode motion vector calculation method for b picture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1449197A (en) * | 2002-03-29 | 2003-10-15 | Lg电子株式会社 | B image mode determining method and apparatus of video coding system |
| CN1812586A (en) * | 2002-10-04 | 2006-08-02 | Lg电子株式会社 | Direct mode motion vector calculation method for b picture |
| WO2006052577A2 (en) * | 2004-11-04 | 2006-05-18 | Thomson Licensing | Method and apparatus for fast mode decision of b-frames in a video encoder |
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