CN101765014B - Device and method for generating re-sampling reference picture and image-decoding system - Google Patents
Device and method for generating re-sampling reference picture and image-decoding system Download PDFInfo
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Abstract
The invention relates to a device and a method for generating a re-sampling reference picture and an image-decoding system. The device and the method for generating a re-sampling reference picture are suitable for the image-decoding system which is used for decoding a bit stream to acquire a current picture. The method for generating a re-sampling reference picture comprises the following steps of: (a) previewing the special information of x pictures next to the current picture in the bit stream, wherein x is an integer; and (b) deciding whether to generate the re-sampling reference picture or not according to the special information of the next x pictures.
Description
Technical field
The present invention relates to a kind of image-decoding system; Particularly relate to a kind of image-decoding system that can produce re-sampling reference picture (Reference Picture Resampling Generation), and the device and its method that produce re-sampling reference picture.
Background technology
In the process of image coding, image coder can earlier image frame be divided into identical size usually and unit is the huge block (Macro-Block) of 16 * 16 pixels, wherein, does not overlap mutually between each huge block.Then, image coder is done (Inter) prediction between (Intra) and picture in the picture with these huge blocks, and wherein, two kinds of predictions of above-mentioned this can be used to eliminate space and temporal redundancy.Then; Surplus value (Residual) after image coder can subtract each other prediction block and former block does discrete cosine transform (Discrete Cosine Transform abbreviates DCT as), quantize (Quantization) and entropy coding (Entropy coding) and obtain bit stream (Bit Stream).
Then, please with reference to Fig. 1, Fig. 1 is the system block diagrams of traditional image-decoding system 10.This traditional image-decoding system 10 comprises length-changeable decoding (Variable Length Decoding; Abbreviate VLD as) unit 11, inverse quantization (Inversed Quantization; Abbreviate IQ as) filter (In-Loop Filter) 15, selector 16, intra-frame prediction (IntraPrediction) unit 17, motion compensation (Motion Compensation) unit 18 and picture memory 19 in unit 12, anti-discrete cosine conversion (Inversed Discrete Cosine Transform abbreviates IDCT as) unit 13, adder 14, loop.Wherein, the relation that couples of each element is just seldom given unnecessary details at this as shown in Figure 1.
The decoding process of image-decoding system 10 is then opposite with aforesaid cataloged procedure, and at first, length-changeable decoding unit 11 can carry out the entropy decoding by contraposition stream.Then, inverse quantization is carried out in the output of 12 pairs of length-changeable decoding unit 11 of inverse quantization unit, and then, the anti-discrete cosine conversion is carried out in the output of 13 pairs of inverse quantization unit 12 of anti-discrete cosine converting unit, to obtain surplus value.Then, adder 14 is with in resulting surplus value and the picture or the addition of inter-picture prediction block, to obtain rebuilding (Reconstruct) picture.Wherein, intra-frame prediction unit 17 is in order to produce the intra-frame prediction block, and motion compensation unit 18 then produces the inter-picture prediction block according to many stored image frames in the picture memory 19.
At last; Filter 15 carries out filtering with the picture of rebuilding in the loop of image-decoding system 10; To obtain more smoothly not having the output picture of square; And this output picture is sent to display unit or is sent to the reference picture of picture memory 19 as next time inter-picture prediction, wherein, must be I picture or P picture as the reference picture of next time inter-picture prediction.
In addition, in the image video signal standard of majority, do not need with reference to any picture and the picture that can be in decode procedure be rebuild is called the I picture.In decode procedure, need to be called the P picture with reference to the picture that last non-B picture could be rebuild, the picture that needs could be rebuild with reference to non-B picture of last Zhang Yuhou simultaneously then is called the B picture.Wherein, non-B picture is meant I picture or P picture.
Please with reference to Fig. 2, Fig. 2 be bit stream behind image-decoding in display unit institute picture displayed and the sketch map that shows the time.As example shown in Figure 2, bit stream is I picture I0, B picture B1～B3, P picture P4, B picture B5～B7 and P picture P8 in regular turn through the picture of the decoding back display unit that is shown in.
As noted earlier, I picture I0 does not need just can be rebuild with reference to any picture.The P picture needs could to be rebuild with reference to last non-B picture, and for example, the reconstruction of P picture P4 need be with reference to I picture I0, and the reconstruction of P picture P8 need be with reference to P picture P4.The B picture needs could to be rebuild with reference to non-B picture of last Zhang Yuhou, and for example, the reconstruction of B picture B1～B3 is all with reference to I picture I0 and P picture P4, and the reconstruction of B picture B5～B7 is all with reference to P picture P4 and P8.
Then, please with reference to Fig. 3, Fig. 3 is the sketch map corresponding to the decode time of a plurality of pictures of Fig. 2.In the process of decoding, produce the order and the order that attendes institute's picture displayed in display unit and inconsistent of reconstruct.Bit stream is behind image-decoding, and first picture that is produced is I picture I0.Then, P picture P4 can be rebuild with reference to I picture I0.Afterwards, B picture B1～B3 can be rebuild with reference to P picture P4 and I picture I0 in regular turn.Then, P picture P8 can be rebuild with reference to P picture P4.Then, B picture B5～B7 can be rebuild with reference to P picture P4 and P8 in regular turn.
In carrying out the image coding process, because of Channel Bandwidth is not enough, satisfy the frequency range restriction sometimes and must adjust compression ratio, method commonly used has the adjustment quantized value or reduces the picture resolution.Yet, if when running into the picture resolution and changing, need earlier reference picture to be done corresponding amplification or dwindled adjustment, to be fit to the image size and the shape of required prediction at the decode system end.
Please with reference to Fig. 4, Fig. 4 is the sketch map that reference picture R1 is adjusted to reference picture R2.As noted earlier, when the image size and shape of next picture and reference picture R1 not simultaneously, just must change the image size and shape of reference picture R1.In this example, be that the image size and shape of next picture of hypothesis is identical with reference picture R2, therefore, reference picture R1 can be adjusted to reference picture R2.
Reference picture resample (Reference Picture Resampling abbreviates RPR as) algorithm be provide reference picture by with reference to before can be changed the algorithm of size or shape earlier, with the size and the shape of the picture that is fit to required prediction.
The TMN that meets the H263+ standard 3.0 decoding programs that developed with Canadian British Columbia university (University of British Columbia) are example; These TMN 3.0 decoding programs are when each picture of decoding; If find that the resolution of present picture and reference picture is inequality; Then can be earlier to the reference picture processing of suitably resampling, again with institute produce re-sampling reference picture give present picture as a reference picture use.Wherein, above-mentioned reference picture is done suitably to resample to handle be meant reference picture reduced sampling (Down Sample) or rises take a sample (Up Sample).
Please with reference to Fig. 5, Fig. 5 is decode time and the graph of a relation of picture of the decode procedure of the algorithm that adopted of TMN 3.0 decoding programs.In the example of Fig. 5, bit stream has only comprised the information of I picture and P picture.In the decode procedure of this example of Fig. 5, the reconstruction meeting of P picture P1 is with reference to I picture I0, and the reconstruction of P picture P2 and P3 is then respectively with reference to P picture P1 and P2.Be noted that; P picture P3 is different with the resolution (that is image size) of P4; So; The algorithm that TMN 3.0 decoding programs are adopted can be carried out the action of re-sampling reference picture to P picture P3 earlier, to produce re-sampling reference picture P3 ' (that is P picture P3 '), just lets P picture P4 with reference to P picture P3 ' then.Wherein, in this example, carry out re-sampling reference picture according to P picture P3 and be meant P picture P3 is carried out rising sampling, to produce P picture P3 '.
The reconstruction of P picture P5 and P6 respectively will be with reference to P picture P4 and P5, and the reconstruction of P picture P8 and P9 then respectively will be with reference to P picture P7 and P8.Because; P picture P6 is different with the resolution of P7, so the algorithm that TMN 3.0 decoding programs are adopted can be carried out the action of re-sampling reference picture to P picture P6 earlier; To produce re-sampling reference picture P6 ' (P picture P6 '), just let P picture P7 then with reference to P picture P7 '.Wherein, in this example, the action of carrying out re-sampling reference picture according to P picture P6 is meant P picture P6 is reduced sampling, to produce P picture P6 '.
In the process of decoding, the algorithm that TMN 3.0 decoding programs are adopted must be resampled to P picture P3 and P6 earlier, and obtains to be fit to P picture P3 ' and the P6 ' to P picture P4 and P7 reference, can let P picture P4 and P7 successfully rebuild.Therefore, when P picture P4 and P7 were decoded, TMN 3.0 decoding programs can make the computer installation of carrying out this decoding program increase computing clock number and storage access number of times.
In sum, the algorithm that above-mentioned TMN 3.0 decoding programs are adopted need expend extra time computing, and can increase the access amount of memory.Therefore, to instant video service, if when needing to change the resolution of reference picture, then TMN 3.0 decoding programs maybe be because need expend the extra time, and immediately display frame on display unit.In addition, because when changing the resolution of reference picture, TMN 3.0 decoding programs can increase the access amount of memory, so needed memory band width also must relatively increase.
Summary of the invention
Example embodiment of the present invention provides a kind of method, device and image-decoding system that produces re-sampling reference picture.
Example embodiment of the present invention provides a kind of method that produces re-sampling reference picture, and this method that produces re-sampling reference picture is applicable to image-decoding system.Image-decoding system is decoded in order to contraposition stream, to get picture up till now.This method that produces re-sampling reference picture may further comprise the steps: see in advance that (a) the following x of the present picture in (Look Ahead) bit stream opens the customizing messages of picture, wherein, x is a natural number; (b) whether produce re-sampling reference picture according to the customizing messages decision of descending x to open picture.
Example embodiment of the present invention provides a kind of device that produces re-sampling reference picture, and this device that produces re-sampling reference picture is applicable to image-decoding system.Image-decoding system is decoded in order to contraposition stream, to get picture up till now.This device that produces re-sampling reference picture comprises that header sees unit (Header Look Ahead Unit) and re-sampling reference picture processing unit in advance, and header sees that in advance unit and re-sampling reference picture processing unit are coupled to each other.Header sees that in advance the unit opens the customizing messages of picture in order to the following x that sees the present picture in the bit stream in advance, and the customizing messages output index signal of opening picture according to x down.Wherein, x is a natural number.Whether decision produces re-sampling reference picture to the re-sampling reference picture processing unit according to index signal.
Example embodiment of the present invention provides a kind of image-decoding system, and this image-decoding system comprises image-decoding device and the device that produces re-sampling reference picture.Wherein, the image-decoding device couples with the device that produces re-sampling reference picture.The device that produces re-sampling reference picture comprises that header sees unit and re-sampling reference picture processing unit in advance, and header sees that in advance unit and re-sampling reference picture processing unit are coupled to each other.The image-decoding device is decoded in order to contraposition stream, to get picture up till now.Header sees that in advance the unit opens the customizing messages of picture in order to the following x that sees the present picture in the bit stream in advance, and the customizing messages output index signal of opening picture according to x down.Wherein, x is a natural number.Whether decision produces re-sampling reference picture to the re-sampling reference picture processing unit according to index signal.
Device, method and the image-decoding system of the generation re-sampling reference picture that example embodiment of the present invention provided can produce re-sampling reference picture concurrently, makes image-decoding system can in decode procedure, produce the reference picture of different resolutions simultaneously.Therefore, can reduce the computing clock number of computer installation by this, also can use (Data Reuse) a large amount of demands that reduce memory band width again because of using data.
For making the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts example embodiment, and conjunction with figs. specifies as follows.
Description of drawings
Fig. 1 is the system block diagrams of traditional image-decoding system 10.
Fig. 2 be bit stream behind image-decoding in display unit institute picture displayed and the sketch map that shows the time.
Fig. 3 is the sketch map corresponding to the decode time of a plurality of pictures of Fig. 2.
Fig. 4 is the sketch map that reference picture R1 is adjusted to reference picture R2.
Fig. 5 is decode time and the graph of a relation of picture of the decode procedure of the algorithm that adopted of TMN 3.0 decoding programs.
Fig. 6 is that the method sketch map that produces re-sampling reference picture that provides is implemented in demonstration of the present invention.
Fig. 7 is the system block diagrams of the demonstration of the present invention image-decoding system 70 implementing to be provided.
Fig. 8 is the sketch map of the data format of a certain picture in the bit stream.
Fig. 9 is to use decode time and the graph of a relation of picture in the decode procedure of the image-decoding system 70 that demonstration of the present invention implements to be provided.
Figure 10 is the flow chart of the method for the demonstration of the present invention generation re-sampling reference picture implementing to be provided.
Figure 11 be bit stream behind image-decoding in display unit institute picture displayed and the sketch map that shows the time, wherein, the picture of part is different with the resolution of its reference picture.
Figure 12 is the sketch map corresponding to the decode time of a plurality of pictures of Figure 11.
Figure 13 is the flow chart of the method for the demonstration of the present invention generation re-sampling reference picture implementing to be provided.
The reference numeral explanation
10: traditional image-decoding system
11: the length-changeable decoding unit
12: inverse quantization unit
13: the anti-discrete cosine converting unit
14: adder
15: filter in the loop
16: selector
17: the intra-frame prediction unit
18: the motion compensation unit
19: picture memory
70: image-decoding system
71: the length-changeable decoding unit
72: inverse quantization unit
73: the anti-discrete cosine converting unit
74: adder
75: filter in the loop
76: selector
77: the intra-frame prediction unit
78: the motion compensation unit
79: picture memory
700: the device that produces re-sampling reference picture
701: header is seen the unit in advance
702: the re-sampling reference picture processing unit
710: the image-decoding device
S250～S254: steps flow chart
S500～S517: steps flow chart
R1, R2: reference picture
The I0:I picture
P1～P9, P13, P3 ', P6 ', P8 ': P picture
B1～B3, B5～B7, B10～B12:B picture
Embodiment
The algorithm that traditional T MN 3.0 decoding programs are adopted need expend extra time computing; And can increase the access amount of memory; So; In order to solve above-mentioned or other problem; The devices and methods therefor of the generation re-sampling reference picture that example embodiment of the present invention provided and image-decoding system can produce re-sampling reference picture concurrently when resolution of picture (that is size) or alteration of form, make image-decoding system can in decode procedure, produce the reference picture of different resolutions simultaneously.
Please with reference to Fig. 6, Fig. 6 is that the method sketch map that produces re-sampling reference picture that provides is implemented in demonstration of the present invention.The example of Fig. 6 is the example that received bit stream only comprises I and P picture; Yet; This example has been merely and has made things convenient for explanation, and the devices and methods therefor of the generation re-sampling reference picture that example embodiment of the present invention provided and image-decoding system are not to be defined in this example embodiment.In other words,, the situation that comprises I picture, P picture and B picture to bit stream is also arranged, the method, device and the image-decoding system that produce re-sampling reference picture are provided in other example embodiment of the present invention.
In addition, in this example embodiment, P picture P3 is different with the resolution of P4, and P picture P6 is different with the resolution of P7.Therefore, when P picture P3 is rebuild,, then can be earlier the information of the resolution of next P picture P4 be kept in to storage device earlier if the resolution that can learn next P picture P4 earlier and present P picture P3 are not simultaneously.Then, in the reconstruction of accomplishing P picture P3, produce the resolution P3 ' picture identical according to the information of the resolution of P picture P4, and this picture is kept in to storage device with P picture P4.Then, when P picture P4 was rebuild, then the P picture P4 P picture P3 ' that just can directly keep in reference to storage device rebuild.
In like manner can know, when P picture P6 is rebuild,, then can be earlier the information of the resolution of next P picture P7 be kept in to storage device earlier if the resolution of the resolution that can learn next P picture P7 and P picture P6 is not simultaneously.Then, in the reconstruction of accomplishing P picture P6, produce the resolution P6 ' picture identical according to the information of the resolution of P picture P7, and this picture is kept in to storage device with P picture P7.Then, when P picture P7 was rebuild, then the P picture P7 P picture P6 ' that just can directly keep in reference to storage device rebuild.
In addition, though to it should be noted that the example embodiment of Fig. 6 be situation about changing to the picture resolution; But in fact; Alteration of form also must produce re-sampling reference picture, and therefore, the situation that produces re-sampling reference picture is not to be limited to the situation that resolution changes.In other words, when resolution, shape or the colour disk etc. of next picture changed, then present picture just must need be resampled to produce corresponding re-sampling reference picture to next picture reference.
Then, please with reference to Fig. 7, Fig. 7 is the system block diagrams of the demonstration of the present invention image-decoding system 70 implementing to be provided.Image-decoding system 70 comprises the device 700 and image-decoding device 710 that produces re-sampling reference picture; Decoding device also comprises filter 75 in the length-changeable decoding unit 71, inverse quantization unit 72, anti-discrete cosine converting unit 73, adder 74, loop, selector 76, intra-frame prediction unit 77, motion compensation unit 78 and picture memory 79, and the device 700 of re-sampling reference picture has comprised that then header sees unit 701 and re-sampling reference picture processing unit 702 in advance.
Length-changeable decoding unit 71 is coupled to inverse quantization unit 72; Inverse quantization unit 72 is coupled to anti-discrete cosine converting unit 73; Anti-discrete cosine converting unit 73 is coupled to adder 74; Adder 74 is coupled to filter 75 and selector 76 in the loop; Selector 76 is coupled to intra-frame prediction unit 77 and motion compensation unit 78, and filter 75 is coupled to picture memory 79 and the device 700 that produces re-sampling reference picture in the loop, and picture memory 79 is coupled to motion compensation unit 78 and the device 700 that produces re-sampling reference picture.Header sees that in advance unit 701 is coupled to re-sampling reference picture processing unit 702, and re-sampling reference picture processing unit 702 is coupled to filter 75 and picture memory 79 in the loop.
Before the function of each element of introducing image-decoding system 70, the included data of bit stream that received are described at this.Please with reference to Fig. 8, Fig. 8 is the sketch map of the data format of a certain picture in the bit stream.Data shown in Figure 8 are data of some pictures, can comprise a plurality of data as Fig. 8 in the bit stream that is received.Wherein, data shown in Figure 8 have comprised initial code 80, relevant parameter 81 and picture data 82 etc.
Then, return Fig. 7, image-decoding device 710 is decoded in order to contraposition stream, to obtain the output picture.Length-changeable decoding unit 71 can carry out the entropy decoding by contraposition stream, and inverse quantization is carried out in the output of 72 pairs of length-changeable decoding unit 11 of inverse quantization unit.Anti-discrete cosine conversion is carried out in the output of 73 pairs of inverse quantization unit 72 of anti-discrete cosine converting unit, and adder 74 is with in resulting surplus value and the picture or the addition of inter-picture prediction block, to obtain the picture of reconstruction (Reconstruct).Wherein, intra-frame prediction unit 77 is in order to produce the intra-frame prediction block, and motion compensation unit 78 then produces the inter-picture prediction block according to many stored image frames in the picture memory 79.Filter 75 carries out filtering with the picture of rebuilding in the loop, obtaining more smoothly not having the output picture of square, and this output picture is sent to display unit or is sent to the reference picture of picture memory 79 as next time inter-picture prediction.
At this, earlier present output picture is defined as present picture, and initial code and the relevant parameter of opening picture corresponding to the following x of present picture in the bit stream are defined as customizing messages.Wherein, following x opens the relevant parameter that in the picture each opens picture and comprises resolution information or picture shape information.Then, device 700 each the interior element function that produce re-sampling reference picture will be introduced as follows.
Header sees that in advance unit 701 opens the customizing messages of picture in order to the following x that sees the present picture in this bit stream in advance, and the customizing messages output index signal of opening picture according to x down.Wherein, x is a natural number.Whether decision produces re-sampling reference picture to re-sampling reference picture processing unit 702 according to index signal.
At this, earlier only comprise that with bit stream the example embodiment of I and P picture explains image-decoding system 70.Yet this example embodiment is not in order to limit the present invention.When bit stream only comprised I and P picture, then x can be made as 1.Therefore, when the resolution information that customizing messages comprised of next P picture or picture shape information and picture at present not simultaneously, then header sees that in advance the index signal of being exported unit 701 can activation re-sampling reference picture processing unit 702.Then, re-sampling reference picture processing unit 702 just can be opened the customizing messages generation re-sampling reference picture of P picture according to present picture and next, and wherein, the resolution of re-sampling reference picture is identical with next P picture with the picture shape.
Can be stored in re-sampling reference picture processing unit 702 or picture memory 79 at this re-sampling reference picture that is noted that re-sampling reference picture processing unit 702 is produced.Then, next open P picture after decode procedure in, just can be, and do not need to produce again re-sampling reference picture directly with reference to re-sampling reference picture.Therefore; Utilize header to see that in advance unit 701 sees that in advance the customizing messages of next P picture just can let image-decoding system 70 in to present picture codec; Produce re-sampling reference picture concurrently, and can reduce the demand of the frequency range of computing clock number and minimizing picture memory 79 by this.
In addition; When if next picture of picture is the I picture at present; Because I picture itself does not need with reference to any picture; So no matter whether next resolution or the picture shape of opening the I picture equate with present picture that header sees that in advance the index signal of being exported unit 701 can forbidden energy re-sampling reference picture processing unit 702.If next resolution of opening the P picture is identical with present picture with the picture shape; Represent that then next P picture can be directly with reference to present picture; And need not produce re-sampling reference picture, so header sees that in advance the index signal of being exported unit 701 can forbidden energy re-sampling reference picture processing unit 702.
When re-sampling reference picture processing unit 702 can be in disabled state, the function of image-decoding system 70 can be similar with traditional image-decoding system of Fig. 1.When re-sampling reference picture processing unit 702 is in enabled status; Re-sampling reference picture processing unit 702 can receive present picture and the index signal that filter 75 is exported in the loop; Wherein, index signal can comprise the customizing messages of next P picture.Then; Re-sampling reference picture processing unit 702 understands the present picture of being exported according to filter in the loop 75 and the customizing messages that next opens the P picture set up a re-sampling reference picture, and this re-sampling reference picture is delivered to picture memory 79 storages or is stored in re-sampling reference picture processing unit 702 voluntarily.Because the resolution of re-sampling reference picture is identical with next resolution of opening the P picture.Therefore, next open P picture after decode procedure in, just can be with reference to re-sampling reference picture.
Then, please with reference to Fig. 9, Fig. 9 is to use decode time and the graph of a relation of picture in the decode procedure of the image-decoding system 70 that demonstration of the present invention implements to be provided.When the image-decoding system of stating in the use 70 is decoded; Image-decoding system 70 can solve I picture I0 earlier; And when I picture I0 is decoded; Whether header sees that in advance unit 701 can see the customizing messages of next picture in advance, be the P picture to judge next picture, and whether its resolution is different with present picture.Because I picture I0 is identical with the resolution of P picture P1, therefore, re-sampling reference picture processing unit 702 can be in disabled state.
Then; When P picture P1 was decoded, P picture P1 must could successfully be solved with reference to I picture I0, and header sees that in advance unit 701 can see the customizing messages of next picture in advance; Judging whether next picture is the P picture, and whether its resolution is different with present picture.Because P picture P1 is identical with the resolution of P2, therefore, re-sampling reference picture processing unit 702 can be in disabled state.The decode procedure of remaining P picture P2, P3 can also be learnt from above-mentioned narration, so seldom introduce.
When P picture P4 is decoded, because header is seen the first customizing messages that see next P picture P5 in advance of unit meeting in advance, therefore can know that P4 is different with the resolution of P5 picture.At this moment, re-sampling reference picture processing unit 702 can be in enabled status, and re-sampling reference picture processing unit 702 can produce a resolution re-sampling reference picture P4 ' identical with P picture P5 when the P4 picture is decoded.Then, re-sampling reference picture P4 ' can be stored, and when P picture P5 was decoded, P picture P5 just can be with reference to re-sampling reference picture P4 '.In addition, by above-mentioned introduction, those skilled in the art just can know the decode procedure of P picture P6～P9 easily, therefore just no longer the decode procedure of P picture P6～P9 is introduced at this.
Then, please with reference to Figure 10, Figure 10 is the flow chart of the method for the demonstration of the present invention generation re-sampling reference picture implementing to be provided.Though Figure 10 is to only comprising that I and P picture and x are the example embodiment of 1 situation in the bit stream, the example embodiment of Figure 10 is not in order to qualification the present invention.In addition; Though the example embodiment of Figure 10 is to carry out the action that reference picture is resampled to the resolution condition of different between picture; But; Those skilled in the art can know that the example embodiment of Figure 10 just can be to being carried out the action that reference picture is resampled by the variform situation between picture through suitably revising from above-mentioned introduction.
At first, in step S250, see the customizing messages of next picture in the bit stream in advance.Wherein, the customizing messages of next picture can comprise its resolution information or picture shape information.Then, in step S251, judge that whether next picture is P picture and its resolution whether change (that is judging whether present picture is identical with next resolution of opening the P picture).If next opens picture is the I picture, perhaps next open picture be the P picture but its resolution is identical with present picture, execution in step S252 then.If next opens picture is that P picture and its resolution are different with present picture, then execution in step S253.
In step S252, present picture is decoded.In step S253, present picture to be decoded, and produce a re-sampling reference picture wherein, the resolution of this re-sampling reference picture is identical with next P picture.Wherein, the re-sampling reference picture that is produced just can offer next P picture and in the process of decoding, be used as reference picture.In step S254, judge whether bit stream decodes to finish, if then accomplish the decoding program of bit stream; If not, then get back to step S250.
Then, please with reference to Figure 11 and Figure 12, Figure 11 be bit stream behind image-decoding in display unit institute picture displayed and the sketch map that shows the time, and Figure 12 is the sketch map corresponding to the decode time of a plurality of pictures of Figure 11.Wherein, the picture of part is different with the resolution of its reference picture.Shown in Figure 11 and 12, I picture I0, P picture P4, P8, P9, P13 and B picture B1～B3, B5～B7 and B10～B12 have been comprised in this bit stream.Wherein, the DISPLAY ORDER of each picture and decoding order are shown in Figure 11 and 12.
Yet, what deserves to be mentioned is that the P picture P8 in the bit stream is different with the resolution of P9.Therefore, in process, just must produce a P picture P8 ', to let the P picture P9 can be by this with reference to P picture P8 ' in the process of decoding to P picture P8 and B picture B5～B7 decoding.
Comprise the situation of I picture, P picture and B picture in 70 pairs of bit streams of the image-decoding system that example embodiment provided of Fig. 7, still can be suitable for.Please go back again with reference to Fig. 7, below will explain under above-mentioned situation, produce the operation of device 700 with the image-decoding system 70 of re-sampling reference picture.In addition, under the prerequisite that is without loss of generality, following explanation is that the value with x is set at 5 example embodiment.Yet the value of x is not in order to limit the present invention.
If when present picture is non-B picture; Following 5 pictures are not the B picture entirely; And first non-B picture in following 5 pictures is the P picture; And the resolution information that customizing messages comprised of this P picture or picture shape information and present picture are not simultaneously, and then header sees that in advance unit 701 meeting output index signals are with 702 activations of re-sampling reference picture processing unit.Re-sampling reference picture processing unit 702 produces re-sampling reference picture according to the customizing messages of this P picture in present picture and following 5 pictures.Wherein, the resolution of re-sampling reference picture is identical with this P picture in picture shape and following 5 pictures.
If at present picture is that non-B picture and following 5 pictures are when being all the B picture; Header sees that in advance unit 701 meeting output index signals are with 702 activations of re-sampling reference picture processing unit; 702 bit streams that can therefore store present picture of re-sampling reference picture processing unit are on the particular space address, and the value of the sign of will resampling is made as very.Wherein, this particular space address can be the storage device of re-sampling reference picture processing unit 702 itself, or an external memory etc.
When present picture is B picture and following 5 pictures when being all the B picture, header see in advance unit 701 can the output index signals with re-sampling reference picture processing unit 702 forbidden energy.At this moment, the described traditional image-decoding system of the running of image-decoding device 710 and Fig. 1 10 is similar.
If picture is the B picture at present; Following 5 pictures are not the B picture entirely; And next opens picture is the P picture; And the resolution information that customizing messages comprised of this P picture or picture shape information and this present picture are not simultaneously, and header sees that in advance unit 701 meeting output index signals are with 702 activations of re-sampling reference picture processing unit.Re-sampling reference picture processing unit 702 judges then whether the value of the sign of resampling is true; The value of sign is for true if resample; Then re-sampling reference picture processing unit 702 is according to producing re-sampling reference picture corresponding to last non-B picture of the picture at present picture bit stream of particular space address (that is be stored in before) with next customizing messages of opening this P picture, and the value of the sign of then will resampling is made as non-true; The value of sign is that then re-sampling reference picture processing unit 702 does not produce re-sampling reference picture for non-true if resample.Wherein, the resolution of re-sampling reference picture is identical with next this P picture with the picture shape.If next opens picture is that I picture or next are opened the resolution information that customizing messages comprised or the picture shape information of this P picture when identical with present picture; Header is seen unit 701 meeting output index signals in advance with re-sampling reference picture processing unit 702 forbidden energy, and the value of the sign of will resampling is set at non-true.When if next picture is the B picture; Header sees that in advance unit 701 meeting output index signals are with re-sampling reference picture processing unit 702 forbidden energy; Image-decoding device 710 can carry out picture codec according to general decoding process; And re-sampling reference picture processing unit 702 does not produce re-sampling reference picture at this moment, and keeps the value of the sign of resampling at present.
Then, please with reference to Figure 13, Figure 13 is the flow chart of the method for the demonstration of the present invention generation re-sampling reference picture implementing to be provided.Figure 13 is to the example embodiment that comprises the situation of I picture, P picture and B picture in the bit stream.This method that produces re-sampling reference picture is used for image-decoding system, and image-decoding system can receive bit stream, and obtains a plurality of reconstruct according to bitstream decoding, at this, present reconstruct is called present picture.Wherein, the value of x can be changed according to different demands by the user.Under the prerequisite that is without loss of generality, following explanation is that the value with x is set at 5 example embodiment.Yet the value of x is not in order to limit the present invention.
At first in step S500, setting resamples is masked as 0.Then, in step S501, judge whether present picture is I picture or P picture, judge just whether present picture is non-B picture.If, execution in step S502 then; If not, execution in step S503 then.
If picture is non-B picture at present, then in step S502, see the customizing messages of following 5 pictures in advance.Then, in step S509, judge whether following 5 pictures are all the B picture.If, execution in step S510 then; If not, execution in step S511 then.If following 5 pictures are not the B picture entirely, then in step S511, judge whether first non-B picture in following 5 pictures be whether the resolution of P picture and this P picture is different with present picture.
If above-mentioned Rule of judgment is not, then execution in step S512.If above-mentioned Rule of judgment is true, then execution in step S513.In step S513, image-decoding system still can produce reconstruct to bitstream decoding, and this method that produces re-sampling reference picture can be in decoding, and the customizing messages of opening the P picture according to present picture therewith produces re-sampling reference picture.Wherein, to open the P picture therewith identical for the resolution of re-sampling reference picture and picture shape.Then, execution in step S508.
If following 5 pictures are all the B picture, then in step S510, the bit stream that stores present picture is in the particular space address, and the sign of will resampling is made as 1.Afterwards, in step S512, image-decoding system can carry out normal decoding program, and can not produce re-sampling reference picture.Then, execution in step S508.
If picture is the B picture at present, then in step S503, see the customizing messages of following 5 pictures in advance.Afterwards, in step S504, judge whether following 5 pictures are all the B picture.If, execution in step S505 then; If not, execution in step S506 then.If following 5 pictures are all the B picture, then in step S505, can let image-decoding system carry out normal image-decoding program, and can not produce re-sampling reference picture.Then, execution in step S508.
If following 5 pictures are not the B picture entirely, then in step S506, judge whether next picture is the P picture.If next opens picture is the P picture, then in step S507, judge whether the resolution of this P picture is different with present picture.If the resolution of this P picture with picture is different at present, then in step S514, judges whether the sign of resampling is 1.Be masked as 1 if resample, then and then carry out step S515.If next opens picture is not the P picture; Then execution in step S517 judges whether next picture is the B picture, is the B picture if next opens picture; Then in step S505; Can let image-decoding system carry out normal image-decoding program, and can not produce re-sampling reference picture, and keep the value of the sign of resampling at present.If next opens picture neither be that the P picture also is not B picture (that is next opens picture is the I picture), execution in step S516 then, will resample indicates and is made as 0, and execution in step S505 and then, can let image-decoding system carry out normal image-decoding program.
In other words, be the P picture only at next picture, its resolution is with at present picture is different, and resamples and be masked as under the genuine situation, just understands execution in step S515.
In step S515; Read the picture bit stream that before is stored in the particular space address, just read last non-B picture of present picture, then; Image-decoding system can and produce reconstruct to the bitstream decoding of this non-B picture; And this method that produces re-sampling reference picture can be opened the customizing messages generation re-sampling reference picture of P picture according to this non-B picture and next in decoding, and the sign of will resampling is made as 0.Wherein, the resolution of re-sampling reference picture is identical with next P picture with the picture shape.Then, execution in step S508.Yet be noted that in the method, the value of the sign of resampling be 0 be expressed as non-true, and the value of the sign of resampling be 1 be expressed as true.Yet the value of the sign of resampling is that Fei Zhen is not limited to this with really expression mode.
In step S508, judge whether each picture in the bit stream decodes to finish.If then finish whole this and produce the method for re-sampling reference picture; If not, then get back to step S501.
In sum; Device, method and the image-decoding system of the generation re-sampling reference picture that example embodiment of the present invention provided can produce re-sampling reference picture concurrently, makes image-decoding system can in decode procedure, produce the reference picture of different resolutions simultaneously.Therefore, can reduce the computing clock number of computer installation by this, also can be because of using data again with a large amount of demands that reduce memory band width.
In addition; Device, method and the image-decoding system of the generation re-sampling reference picture that example embodiment of the present invention provided be applicable to and comprise I picture, P picture and B picture in the bit stream, and the value of above-mentioned x can also be according to encoder or user's demand and different.Even, only comprise that at bit stream under the situation of I picture and P picture, the value of above-mentioned x can be 1, and become method, device and the image-decoding system thereof of the lower generation re-sampling reference picture of computation complexity.
Though the present invention discloses as above with example embodiment; Right its is not in order to limit the present invention; Those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with the application's claim.
Claims (27)
1. a method that produces re-sampling reference picture is applicable to an image-decoding system, and this image-decoding system is in order to decoding to a bit stream, and obtaining a present picture, and the method for this generation re-sampling reference picture comprises:
See that in advance the following x of the present picture in this bit stream opens the customizing messages of picture, wherein, x is a natural number; And
Whether the customizing messages decision of opening picture according to following x produces a re-sampling reference picture,
Wherein, the customizing messages that following x opens picture comprises initial code and the relevant parameter of opening each picture in the picture corresponding to following x, and wherein, the relevant parameter that following x opens each picture in the picture comprises a resolution information or a picture shape information.
2. the method for generation re-sampling reference picture as claimed in claim 1; Wherein, When picture that this bit stream comprised is all non-B picture; X is 1, and next opens the resolution information that customizing messages comprised or the picture shape information of P picture and picture at present not simultaneously, and the method for this generation re-sampling reference picture also comprises:
Open this re-sampling reference picture of customizing messages generation of P picture according to this present picture and next, wherein, the resolution of this re-sampling reference picture is identical with next P picture with the picture shape.
3. the method for generation re-sampling reference picture as claimed in claim 1; Wherein, When picture that this bit stream comprises is all non-B picture; X is 1, and next opens the resolution information that customizing messages comprised of P picture when identical with present picture with the picture shape information, does not then produce this re-sampling reference picture.
4. the method for generation re-sampling reference picture as claimed in claim 1; Wherein, When this present picture is non-B picture, following x opens picture and is not the B picture entirely, and first non-B picture that following x opens in the picture is the P picture; And the resolution information that customizing messages comprised of this P picture or picture shape information and this present picture are not simultaneously; Then produce this re-sampling reference picture according to this present picture and the customizing messages that following x opens this P picture in the picture, wherein, the resolution of this re-sampling reference picture is identical with this P picture that following x opens in the picture with the picture shape.
5. the method for generation re-sampling reference picture as claimed in claim 1, wherein, when this present picture is a non-B picture and when down x opened picture and is all the B picture, then the method for this generation re-sampling reference picture also comprised:
The bit stream that stores this present picture is in a particular space address, and with one resample sign value be made as very.
6. the method for generation re-sampling reference picture as claimed in claim 1; Wherein, When this present picture is a B picture and when down x opens picture and is all the B picture; Then the method for this generation re-sampling reference picture will not produce this re-sampling reference picture, and let this image system according to general decoding process this bit stream carried out picture codec.
7. the method for generation re-sampling reference picture as claimed in claim 1; Wherein, When this present picture is the B picture, following x opens picture and is not the B picture entirely, and next opens picture is the P picture; And the resolution information that customizing messages comprised of this P picture or picture shape information and present picture are not simultaneously, and then the method for this generation re-sampling reference picture also comprises:
Whether the value of judging the sign of resampling is true; And
The value of sign is for true if this is resampled; Then according to producing this re-sampling reference picture corresponding to last the non-B picture of this present picture and the customizing messages of this P picture; And this value of resampling sign is made as non-true; Wherein, the P picture is identical therewith with the picture shape for the resolution of re-sampling reference picture.
8. the method for generation re-sampling reference picture as claimed in claim 1; Wherein, when this present picture is the B picture, following x opens picture and is not the B picture entirely; If next opens picture is the I picture; Perhaps next to open picture be the P picture, but the resolution information that customizing messages comprised of this P picture or picture shape information be when identical with this present picture, then the method for this generation re-sampling reference picture also comprises:
Let this image system this bit stream carried out picture codec according to general decoding process, and with one resample sign value be made as non-true.
9. the method for generation re-sampling reference picture as claimed in claim 1, wherein, when this present picture is the B picture, following x opens picture and is not the B picture entirely, is the B picture if next opens picture, and then the method for this generation re-sampling reference picture also comprises:
Let this image system this bit stream carried out picture codec according to general decoding process, and keep one resample sign at present value.
10. a device that produces re-sampling reference picture is applicable to an image-decoding system, and this image-decoding system is in order to decode to a bit stream, and to obtain a present picture, the device of this generation re-sampling reference picture comprises:
One header is seen the unit in advance, opens the customizing messages of picture in order to the following x that sees the present picture in this bit stream in advance, and exports an index signal according to the customizing messages that x down opens picture, and wherein, x is a natural number; And
One re-sampling reference picture processing unit is coupled to this header and sees the unit in advance, whether produces a re-sampling reference picture according to this index signal decision,
Wherein, the customizing messages that following x opens picture comprises initial code and the relevant parameter of opening each picture in the picture corresponding to following x, and wherein, the relevant parameter that following x opens each picture in the picture comprises a resolution information or a picture shape information.
11. the device of generation re-sampling reference picture as claimed in claim 10; Wherein, When picture that this bit stream comprised is all non-B picture, x is 1, and next opens the resolution information that customizing messages comprised or the picture shape information of P picture and picture at present not simultaneously; This re-sampling reference picture processing unit of this index signal activation; This re-sampling reference picture processing unit is opened this re-sampling reference picture of customizing messages generation of P picture according to this present picture and next, and wherein, the resolution of this re-sampling reference picture is identical with next P picture with the picture shape.
12. the device of generation re-sampling reference picture as claimed in claim 10; Wherein, When picture that this bit stream comprised is all non-B picture; X is 1, and next opens the resolution information that customizing messages comprised of P picture when identical with present picture with the picture shape information, this re-sampling reference picture processing unit of this index signal forbidden energy.
13. the device of generation re-sampling reference picture as claimed in claim 10; Wherein, When this present picture is non-B picture; Following x opens picture entirely for the B picture, and first non-B picture that following x opens in the picture is the P picture, and the resolution information that customizing messages comprised of this P picture or picture shape information and this present picture are not simultaneously; This re-sampling reference picture processing unit of index signal activation then; This re-sampling reference picture processing unit produces this re-sampling reference picture according to this present picture and the customizing messages that following x opens this P picture in the picture, and wherein, the resolution of this re-sampling reference picture is identical with this P picture that following x opens in the picture with the picture shape.
14. the device of generation re-sampling reference picture as claimed in claim 10; Wherein, When this present picture is a non-B picture and when down x opens picture and is all the B picture; Then this re-sampling reference picture processing unit store this present picture bit stream in a particular space address, and with one resample sign value be made as very.
15. the device of generation re-sampling reference picture as claimed in claim 10; Wherein, When this present picture is a B picture and when down x opens picture and is all the B picture; This index signal forbidden energy re-sampling reference picture processing unit then, and let this image-decoding system this bit stream carried out picture codec according to general decoding process.
16. the device of generation re-sampling reference picture as claimed in claim 10; Wherein, when this present picture was the B picture, following x opened picture and is not the B picture entirely; Next opens picture is the P picture; And the resolution information that customizing messages comprised of this P picture or picture shape information and this present picture are not simultaneously, this re-sampling reference picture processing unit of this index signal activation then, and this re-sampling reference picture processing unit judges whether the value that indicates of resampling is true; The value of sign is for true if this is resampled; Then this re-sampling reference picture processing unit is according to producing this re-sampling reference picture corresponding to last the non-B picture of present picture and the customizing messages of next P picture; And this value of resampling sign is made as non-true; Wherein, the resolution of this re-sampling reference picture is identical with next P picture with the picture shape.
17. the device of generation re-sampling reference picture as claimed in claim 10; Wherein, When this present picture was the B picture, following x opened picture and is not the B picture entirely, is the I picture if next opens picture; Perhaps next to open picture be that P picture but resolution information that its customizing messages comprised or picture shape information are when identical with this present picture; This re-sampling reference picture processing unit of this index signal forbidden energy then, this image-decoding system then carry out picture codec according to general decoding process to this bit stream, and this re-sampling reference picture processing unit with one resample sign value be made as non-true.
18. the device of generation re-sampling reference picture as claimed in claim 10; Wherein, when this present picture was the B picture, following x opened picture and is not the B picture entirely; If next opens picture is the B picture; This re-sampling reference picture processing unit of this index signal forbidden energy then, this image-decoding system then carry out picture codec according to general decoding process to this bit stream, and this re-sampling reference picture processing unit keep one resample sign at present value.
19. an image-decoding system comprises:
One image-decoding device is in order to decode to a bit stream, to obtain a present picture; And
One produces the device of re-sampling reference picture, is coupled to this image-decoding device, comprising:
One header is seen the unit in advance, opens the customizing messages of picture in order to the following x that sees the present picture in this bit stream in advance, and exports an index signal according to the customizing messages that x down opens picture, and wherein, x is a natural number;
One re-sampling reference picture processing unit is coupled to this header and sees the unit in advance, whether produces a re-sampling reference picture according to this index signal decision,
Wherein, the customizing messages that following x opens picture comprises initial code and the relevant parameter of opening each picture in the picture corresponding to following x, and wherein, the relevant parameter that following x opens each picture in the picture comprises a resolution information or a picture shape information.
20. image-decoding system as claimed in claim 19; Wherein, When picture that this bit stream comprised is all non-B picture; X is 1, and next opens the resolution information that customizing messages comprised or the picture shape information of P picture and picture at present not simultaneously, this re-sampling reference picture processing unit of this index signal activation; This re-sampling reference picture processing unit is opened this re-sampling reference picture of customizing messages generation of P picture according to this present picture and next, and wherein the resolution of this re-sampling reference picture is identical with next P picture with the picture shape.
21. image-decoding system as claimed in claim 19; Wherein, When picture that this bit stream comprised is all non-B picture; X is 1, and next opens the resolution information that customizing messages comprised of P picture when identical with present picture with the picture shape information, this re-sampling reference picture processing unit of this index signal forbidden energy.
22. image-decoding system as claimed in claim 19; Wherein, when this present picture is non-B picture, following x opens picture and is not the B picture entirely; First non-B picture that following x opens in the picture is the P picture; And the resolution information that customizing messages comprised of this P picture or picture shape information and this present picture are not simultaneously, this re-sampling reference picture processing unit of index signal activation then, and this re-sampling reference picture processing unit is opened this re-sampling reference picture of customizing messages generation of this P picture in the picture according to this present picture and following x; Wherein, the resolution of this re-sampling reference picture is identical with this P picture that following x opens in the picture with the picture shape.
23. image-decoding system as claimed in claim 19; Wherein, When this present picture is a non-B picture and when down x opens picture and is all the B picture, then this re-sampling reference picture processing unit store this present picture bit stream in a particular space address, and with one resample sign value be made as very.
24. image-decoding system as claimed in claim 19; Wherein, When this present picture is a B picture and when down x opens picture and is all the B picture; This index signal forbidden energy re-sampling reference picture processing unit then, and let this image-decoding system this bit stream carried out picture codec according to general decoding process.
25. image-decoding system as claimed in claim 19; Wherein, when this present picture was the B picture, following x opened picture and is not the B picture entirely; Next opens picture is the P picture; And the resolution information that customizing messages comprised of this P picture or picture shape information and this present picture are not simultaneously, this re-sampling reference picture processing unit of this index signal activation then, and this re-sampling reference picture processing unit judges whether the value that indicates of resampling is true; The value of sign is for true if this is resampled; Then this re-sampling reference picture processing unit is according to producing this re-sampling reference picture corresponding to last the non-B picture of present picture and the customizing messages of next P picture; And this value of resampling sign is made as non-true; Wherein, the resolution of this re-sampling reference picture is identical with next P picture with the picture shape.
26. image-decoding system as claimed in claim 19; Wherein, When this present picture was the B picture, following x opened picture and is not the B picture entirely, is the I picture if next opens picture; Perhaps next to open picture be that P picture but resolution information that its customizing messages comprised or picture shape information are when identical with this present picture; This re-sampling reference picture processing unit of this index signal forbidden energy then, this image-decoding system then carry out picture codec according to general decoding process to this bit stream, and this re-sampling reference picture processing unit with one resample sign value be made as non-true.
27. image-decoding system as claimed in claim 19; Wherein, when this present picture was the B picture, following x opened picture and is not the B picture entirely; If next opens picture is the B picture; This re-sampling reference picture processing unit of this index signal forbidden energy then, this image-decoding system then carry out picture codec according to general decoding process to this bit stream, and keep one resample sign at present value.
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