CN101895748A - Coding and decoding methods and coding and decoding devices - Google Patents
Coding and decoding methods and coding and decoding devices Download PDFInfo
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Abstract
The embodiment of the invention discloses coding and decoding methods and coding and decoding devices, relating to image processing technology and aiming to improve the quality of the images displayed when multi-scene display in the meeting places is realized. The coding method comprises the following steps: respectively obtaining a basic layer image and at least a reinforcement layer image in the meeting place scene; and taking the basic layer image as the scaled video coding (SVC) basic layer and the reinforcement layer image as the SVC reinforcement layer to be coded to form coding stream. The embodiment of the invention is mainly applied to video conferences.
Description
Technical field
The present invention relates to image processing techniques, relate in particular to a kind of decoding method and coding and decoding device.
Background technology
Several modes below general the employing are emphasized some the local scene in the meeting-place in the prior art.
Mode one, utilize the resampling technology to show a plurality of scenes in meeting-place.
In this mode, at first the regional area that needs in the meeting-place to handle is cut out, utilize resample filter that the regional area that cuts out is carried out processing and amplifying then, thereby realize to the emphasizing of the local scene in meeting-place, to show a plurality of scenes in meeting-place.
Mode two, gather the image of different scenes in the meeting-place respectively, adopt different codecs or same codec then, handle the image of these different scenes respectively.
Mode three, the single H.264 encoder of use are divided band (slice) to the zones of different in same meeting-place according to credit rating, and these bands are encoded.
The inventor finds, the image that these prior aries all can not provide high-quality many scenes to show simultaneously efficiently.For example, for mode one, owing to the resample filter Effect on Performance, the quality of the local scene image in meeting-place that obtains through resampling can descend to some extent compared to the preceding picture quality of sampling, and needs extra resample filter resource in this manner.For mode two, because the multi-channel video code stream in same meeting-place uses independently codec respectively, so this encoding and decoding resource that causes this mode to take is many, and the synchronous relatively difficulty between the multi-path video stream in same meeting-place; If adopt codec encoding and decoding multi-path video stream in order, can make multi-path video stream that order is successively arranged again, can't arrive simultaneously, and the frame per second of every road video flowing will descend.For mode three, important area can't realize amplifying the effect of emphasizing, the subjective effect of integral image descends.
Summary of the invention
The embodiment of the invention provides a kind of decoding method and coding and decoding device, to improve the quality of image shown when realizing that the many scenes in meeting-place show.
The embodiment of the invention adopts following technical scheme:
A kind of coding method comprises:
Obtain the basic tomographic image of a width of cloth and at least one width of cloth enhancement layer image in the scene of meeting-place respectively;
But described basic tomographic image as the basic layer of layered video encoding and decoding SVC, described enhancement layer image is encoded as the enhancement layer of described SVC, is formed encoding code stream.
A kind of code device comprises:
Image acquisition unit is used for obtaining respectively the basic tomographic image of a width of cloth and at least one width of cloth enhancement layer image of meeting-place scene;
Coding unit, but be used for described basic tomographic image forming encoding code stream as the basic layer of layered video encoding and decoding SVC, described enhancement layer image is encoded as the enhancement layer of described SVC.
The coding method of the embodiment of the invention and device in the process of coding, for basic tomographic image and enhancement layer image in the meeting-place scene that obtains, but are encoded as basic layer, the enhancement layer of layered video encoding and decoding SVC respectively.The encoding code stream of Xing Chenging has in this manner made full use of the characteristic of SVC coded system, can comprise the code stream of the image correspondence of a plurality of different resolutions in the encoding code stream that forms.Therefore, utilize the coding method and the device of the embodiment of the invention, can improve the quality of image shown when realizing that the many scenes in meeting-place show.
A kind of coding/decoding method comprises:
The received code code stream, but wherein said encoding code stream is to obtain by the basic tomographic image in the scene of meeting-place is encoded as the enhancement layer of described SVC as the basic layer of layered video encoding and decoding SVC, with the enhancement layer image in the scene of meeting-place;
Obtain basic layer bit stream and enhancement layer bitstream respectively according to described encoding code stream;
Respectively described basic layer bit stream and enhancement layer bitstream are decoded, obtain described basic tomographic image and described enhancement layer image.
A kind of decoding device comprises:
The code stream receiving element, be used for the received code code stream, but wherein said encoding code stream is to obtain by the basic tomographic image in the scene of meeting-place is encoded as the enhancement layer of described SVC as the basic layer of layered video encoding and decoding SVC, with the enhancement layer image in the scene of meeting-place;
The code stream acquiring unit is used for obtaining basic layer bit stream and enhancement layer bitstream respectively according to described encoding code stream;
Decoding unit is used for respectively described basic layer bit stream and enhancement layer bitstream being decoded, and obtains described basic tomographic image and described enhancement layer image.
The coding/decoding method of the embodiment of the invention and device owing in the process of coding, be basic tomographic image and enhancement layer image with the meeting-place scene, but respectively as the basic layer of layered video encoding and decoding SVC, enhancement layer is encoded and form encoding code stream.That is to say the encoding code stream that forms in this manner, made full use of the characteristic of SVC coded system, in the encoding code stream that forms, can comprise the code stream of the image correspondence of a plurality of different resolutions.Therefore, can guarantee to utilize the basic tomographic image that coding/decoding method and device obtained of the embodiment of the invention and the quality of enhancement layer image, thereby improve the quality of image shown when realizing that the many scenes in meeting-place show.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done an introduction simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the embodiment of the invention one coding method;
Fig. 2 is the flow chart of the embodiment of the invention two coding/decoding methods;
Fig. 3 is the schematic diagram of embodiment of the invention encoding-decoding process;
Fig. 4 is the flow chart of the embodiment of the invention three coding methods;
Fig. 5 is the flow chart of the embodiment of the invention four coding/decoding methods;
Fig. 6 is another schematic diagram of embodiment of the invention encoding-decoding process;
Fig. 7 is another schematic diagram of embodiment of the invention encoding-decoding process;
Fig. 8 is another schematic diagram of embodiment of the invention encoding-decoding process;
Fig. 9 is the schematic diagram of the embodiment of the invention nine code devices;
Figure 10 is the schematic diagram of the embodiment of the invention ten decoding devices.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
At first the SVC technology being done one simply introduces.SVC (Scalable Video Coding, but the layered video encoding and decoding), being a kind of technology that video flowing can be divided into a plurality of resolution, quality and frame rate layers, is the expansion of H.264 video encoding and decoding standard that current most of video conference device is adopted.Video conference device adopts the SVC technology to receive and dispatch the multi-layer video stream of being made up of a little basic layer and a plurality of other optional layer that improves resolution, frame rate and quality.This layered mode of multi-layer video stream can improve error resilience and video quality greatly, and bandwidth is not had very high requirement.
As shown in Figure 1, the embodiment of the invention one provides a kind of coding method, comprising:
When realizing that the many scenes in meeting-place show, often need when showing the meeting-place panoramic picture, clearly show the image of the local scene in meeting-place.Therefore, when showing, the resolution of panoramic picture is low relatively, and the resolution of the image of local scene is then higher relatively.Therefore, in embodiments of the present invention, according to the characteristics of SVC technology, the panoramic picture in the scene of meeting-place can be used as basic tomographic image, and the image of the local scene of meeting-place scene is as enhancement layer image.Perhaps, when not needing to show the panorama in meeting-place, described basic tomographic image, enhancement layer image all can be the image of the local scene of meeting-place scene, just the resolution difference of the two.
But step 12, with described basic tomographic image as the basic layer of layered video encoding and decoding SVC, described enhancement layer image is encoded as the enhancement layer of described SVC, form encoding code stream.
By the description of the embodiment of the invention one as can be seen, in the process of coding,, but encode as basic layer, the enhancement layer of layered video encoding and decoding SVC respectively for basic tomographic image and enhancement layer image in the meeting-place scene that obtains.The encoding code stream of Xing Chenging has in this manner made full use of the characteristic of SVC coded system, can comprise the code stream of the image correspondence of a plurality of different resolutions in the encoding code stream that forms.Therefore, utilize the coding method of the embodiment of the invention, can improve the quality of image shown when realizing that the many scenes in meeting-place show.
Corresponding with the coding method of embodiment one, the embodiment of the invention two provides a kind of coding/decoding method.As shown in Figure 2, the method for the embodiment of the invention two comprises:
By the description of the embodiment of the invention two as can be seen owing to be basic tomographic image and enhancement layer image in the process of coding with the meeting-place scene, but respectively as the basic layer of layered video encoding and decoding SVC, enhancement layer is encoded and form encoding code stream.That is to say the encoding code stream that forms in this manner, made full use of the characteristic of SVC coded system, in the encoding code stream that forms, can comprise the code stream of the image correspondence of a plurality of different resolutions.Therefore, can guarantee to utilize the basic tomographic image that coding/decoding method obtained of the embodiment of the invention and the quality of enhancement layer image, thereby improve the quality of image shown when realizing that the many scenes in meeting-place show.
Below, describing in conjunction with different embodiment is how to realize Code And Decode.
In conjunction with encoding-decoding process schematic diagram shown in Figure 3 and the coding method flow chart of Fig. 4, the coding method of the embodiment of the invention three comprises:
Whether step 33, definite enhancement layer image that obtains need to carry out the panorama coding.If then directly enhancement layer image is encoded as the enhancement layer of SVC.If not, then utilize positioner or obtain the cutting parameter of enhancement layer image regional area by the mode of manual appointment, determine the regional area of the enhancement layer image that needs are encoded according to described cutting parameter.
For example, can be in the meeting-place setting identification manually in advance, the regional area that requires emphasis with sign.Then, re-use image collecting device collection meeting field picture such as video camera, the zone of in the meeting field picture that collects, finding sign to define.
Wherein, described cutting parameter comprises:
Frame_cropping_flag: whether be used for indicating to decoding device and export after will be with the image cutting, promptly whether sign has the clipping region, 1 expression is that 0 expression is not.
Frame_crop_left_offset: be used for indicating the crop left boundary parameter of image clipping region, can calculate the distance of clipping region left margin and original image left margin by this parameter to decoding device.
Frame_crop_right_offset: be used for indicating the crop right boundary parameter of image clipping region, can calculate the distance of clipping region right margin and original image right margin by this parameter to decoding device.
Frame_crop_top_offset: be used for indicating the cutting coboundary parameter of image clipping region, can calculate the distance of coboundary, clipping region and original image coboundary by this parameter to decoding device.
Frame_crop_bottom_offset: be used for indicating the cutting lower boundary parameter of image clipping region, can calculate the distance of clipping region lower boundary and original image lower boundary by this parameter to decoding device.
According to consensus standard H.264, above-mentioned cutting parameter can be documented in sequence parameter set (SequenceParameter Set, SPS) in.Wherein, H.264 can support maximum 32 SPS.And above-mentioned cutting parameter can send decoding device to together by the encoding code stream that forms later.Wherein, in band (slice) code stream according to every layer of consensus standard H.264 its employed picture parameter set (PictureParameter Set, ID PPS) (sign) are arranged all.Which PPS that can know that current band code stream uses by this ID is, can obtain the ID (sign) of the SPS of this band code stream use then from this PPS.So just can know the SPS that this band code stream uses, thereby can obtain the cutting parameter of this tomographic image.Therefore, decoding device can need to determine the local scene image that shows by the cutting parameter that transmits in reconstructed image, thereby reaches the purpose that obtains the local scene image in meeting-place, effect such as realize that the local scene in meeting-place is emphasized or outstanding.
The detailed process of below encoding to form encoding code stream, comprising:
When forming the coded reference image of enhancement layer image, can utilize the up-sampling device of SVC agreement that basic tomographic image is carried out up-sampling, obtain having the coded reference image of equal resolution with each enhancement layer image.Wherein, coded reference image and described basic tomographic image are with image constantly, the similarity of enhancement layer image and its coded reference image can be very high so, this just makes that the accuracy of the estimation in the cataloged procedure is also very high, thereby improve code efficiency significantly, reduce encoder bit rate, save video bandwidth.
In cataloged procedure, need the residual values between acquisition coded reference image and the enhancement layer image, then this residual values is encoded as coded data.
According to step 33, if need carry out the regional area cutting to the enhancement layer image of certain resolution to obtain the local scene image in meeting-place, emphasize or outstanding display effect that thereby reach then this enhancement layer image also needs the cutting parameter encoded and sends to decoding device.These cutting parameters all with the form coding of syntactic element in the sequence parameter set SPS of encoding code stream.
As previously mentioned, H.264 can support 32 SPS altogether, each enhancement layer image all can be specified corresponding SPS in the process of coding so.The corresponding relation of this enhancement layer image and SPS then can be stored among the PPS, sends to decoding device together by encoding code stream.
Certainly, in this encoding code stream, also may include other syntactic element, for example be used to code stream identification that identifies basic layer bit stream or enhancement layer bitstream etc.
In conjunction with encoding-decoding process schematic diagram shown in Figure 3 and the flow chart of Fig. 5, the coding/decoding method of the embodiment of the invention four comprises:
Step 41, decoding device received code code stream.
Wherein, described code stream identification can be the syntactic element that is used to identify basic layer bit stream and enhancement layer bitstream in the SVC extension syntax.This syntactic element can be for carrying out the syntactic element dependency_id in the syntax parsing process to nal_unit_header_svc_extension (), if dependency_id=0 represents that this code stream is basic layer bit stream, if dependency_id＞0 this code stream of expression is an enhancement layer bitstream.Be used to wherein represent that the dependency_id value of each enhancement layer bitstream can difference be the code stream of which enhancement layer correspondence with differentiation.
Sequence parameter set SPS and picture parameter set PPS in step 43, the described encoding code stream of decoding.At this, can carry out the value that syntax parsing obtains syntactic element nal_unit_type by nal_unit () to code stream.Wherein the NAL of nal_unit_type=7 (Network Abstraction Layer, network abstraction layer) code stream is SPS, and the NAL code stream of nal_unit_type=8 is PPS.
At this, NAL is done simplicity of explanation.According to consensus standard H.264, H.264 algorithm conceptive can be divided into two-layer: video coding layer (VCL:Video Coding Layer) is responsible for video frequency content expressing efficiently, and network abstraction layer is responsible for data are packed and transmitting in the desired appropriate mode of network.
In detailed process, can carry out the decoded reference pictures that up-sampling obtains described enhancement layer bitstream to described basic tomographic image.
The decode slice header of described encoding code stream obtains the ID syntactic element pic_parameter_set_id of the picture parameter set of described encoding code stream, the PPS that this syntactic element specifies current code stream to use.And then obtain the ID syntactic element seq_parameter_set_id of described sequence parameter set, the SPS that this syntactic element specifies current code stream to use by described picture parameter set PPS.At last, obtain corresponding cutting parameter, thereby determine the local scene image in meeting-place according to described cutting parameter by described SPS.
Wherein, the decoding basic tomographic image and the enhancement layer image that obtain can show in same demonstration or after-treatment device or handle, take picture to take turns switching mode and carry out image demonstration or processing; Also can use different demonstrations or after-treatment device to show simultaneously respectively or further process.
Fig. 6 is another schematic diagram of embodiment of the invention encoding-decoding process, and is corresponding, also provides a kind of decoding method respectively in conjunction with Fig. 6 embodiment of the invention five and six, and wherein the coding/decoding method of the embodiment of the invention six and embodiment four descriptions is identical.
For coding method, comparison diagram 3 and 6 in the coding method of embodiment five, has changed the obtain manner of basic tomographic image and enhancement layer image as can be seen.In Fig. 6, obtain by an image collecting device, this can omit the more images harvester compared to mode shown in Figure 3.
In this embodiment, utilize an image collecting device to gather the image of the resolution of actual needs earlier.The resolution of described actual needs can be the highest resolution in the different resolution of display device needs.For example, suppose that the home court scape image resolution ratio that current meeting-place needs is 720x480,, carry out feature or Special attention will be given to etc., need amplify 4 times to this part regional image as rostrum and near zone thereof for to certain regional area of meeting-place.So, the resolution of the image of the regional area resolution that is equivalent to home court scape image need be the 1440x960 size.Utilize the cutting parameter that the regional area that needs is identified out by the mode described in the front embodiment three then.Like this, need be with resolution of this image collecting device collection image that is 1440x960, and then obtain the image that resolution is 720x480 after this image handled.
For the image that collects in the manner described above, carry out down-sampling by downsampling device, obtain the image of piece image or a plurality of resolution, as 720P (1280x720), the images of 800x640 etc., these images and the image that collects all can be encoded as enhancement layer image respectively.Perhaps directly with the described image that collects as enhancement layer image, perhaps the image that carries out obtaining behind the down-sampling with the described image that collects and to the described image that collects is as enhancement layer image.And any enhancement layer image can be provided with the cutting parameter of oneself, makes the decoding device end can get access to the local scene image in meeting-place.
For the image that collects in the manner described above, carry out down-sampling by downsampling device, obtain basic tomographic image.Wherein, the resolution of basic tomographic image can not be greater than the resolution of arbitrary enhancement layer image.The resolution that also is described basic tomographic image is all below the resolution of described enhancement layer image.
That describes among other processes in the present embodiment five and the embodiment three is identical.
Fig. 7 is another schematic diagram of embodiment of the invention encoding-decoding process, and is corresponding, also provides a kind of decoding method respectively in conjunction with Fig. 7 embodiment of the invention seven and eight, and wherein the coding/decoding method of the embodiment of the invention eight and embodiment four descriptions is identical.
For coding method, comparison diagram 3 and 7 in the coding method of embodiment seven, has changed the obtain manner of basic tomographic image as can be seen.According to shown in Figure 7, utilize the less image of resolution of the special collection of an image collecting device as basic tomographic image.Like this, basic tomographic image also comes from same meeting-place, can not introduce the damage of down-sampling, makes estimation more accurate.
That describes among other processes in the present embodiment seven and the embodiment three is identical.
Fig. 8 is another schematic diagram of embodiment of the invention encoding-decoding process.As seen from Figure 8, it is n image collecting device, the n layer enhancement layer image of expanding to shown in Figure 7.Basic tomographic image is to use the special collection of an image collecting device.Certainly, understandable, in distortion embodiment illustrated in fig. 8, also can carry out down-sampling to one of them enhancement layer image and obtain described basic tomographic image by downsampling device.The enhancement layer image of a plurality of local scenes can all use image collecting device to gather respectively, the enhancement layer image that some local scenes also can be arranged is to carry out down-sampling by some big image in different resolution to obtain, and the enhancement layer image of some local scenes is by the image collecting device collection.The enhancement layer image of each local scene utilizes the enhancement layer of a SVC to encode, and basic tomographic image utilizes the basic layer of SVC to encode, thereby decoding device can obtain home court scape image and a plurality of local scene image in a meeting-place.Utilize identical that the coding method of this Fig. 8 and embodiment three or seven describe, it is identical that coding/decoding method and embodiment four describe.
Description by the foregoing description as can be seen, utilize the decoding method of the embodiment of the invention, the quality of image in the time of not only can improving the many scenes in meeting-place and show, and owing to, can effectively avoid same meeting-place difference scene image absolute codings, the dispersion treatment of decoding, take the many and difficult problem of Synchronization Control of resource in the inner many scene images encoding and decoding simultaneously that realize the meeting-place of same SVC coding and decoding device.Simultaneously, the embodiment of the invention has been utilized the characteristic of SVC, comprises the video code flow of the different scenes in same meeting-place in one road code stream, emphasizes the effect that shows to reach efficient, convenient and to take the many scenes in the few meeting-place of resource, and can reduce the resource and the complexity of system.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
As shown in Figure 9, the embodiment of the invention nine also provides a kind of code device, comprising:
As described above described in the method embodiment, described image acquisition unit 91 can comprise: first image collection module, be used for obtaining identical but the image that resolution is different of at least two width of cloth meeting-place scene scenes, and the described image that will obtain is as described enhancement layer image; Second image collection module is used at the described image that obtains, and selects the little image of resolution to carry out down-sampling, obtains described basic tomographic image.
Perhaps, described image acquisition unit 91 can comprise: the 3rd image collection module is used to obtain at least one width of cloth meeting-place scene image; The 4th image collection module, be used for described meeting-place scene image as enhancement layer image or to described meeting-place scene image carry out obtaining behind the down-sampling enhancement layer image or the image that carries out obtaining behind the down-sampling with described meeting-place scene image and to described meeting-place scene image as enhancement layer image; The 5th image collection module is used for a width of cloth of described meeting-place scene image is carried out down-sampling, obtains basic tomographic image, and the resolution of wherein said basic tomographic image is not more than the resolution of arbitrary described enhancement layer image.Wherein, described the 5th image collection module selects the meeting-place scene image to carry out the principle of down-sampling, also can be to select the less image of resolution to sample, to reduce the damage that down-sampling brings picture quality.Described enhancement layer image can be several, and the resolution difference between several.
Wherein, described coding unit 92 comprises: the coded reference image collection module is used for obtaining by up-sampling according to described basic tomographic image the coded reference image of described enhancement layer image; Coding module, be used for adopting H.264 method to encode as the basic layer of described SVC described basic tomographic image, utilize described coded reference image that described enhancement layer image is encoded as the enhancement layer of described SVC, and be respectively the basic layer bit stream of described basic tomographic image correspondence and the enhancement layer bitstream interpolation code stream identification of described enhancement layer image correspondence, form encoding code stream.
For the abundant local scene that shows the meeting-place, better meet user's needs, described coding unit 92 also can comprise: parameter acquisition module is used to obtain the cutting parameter of described enhancement layer image; Described coding module also is used for when forming encoding code stream, and the sequential parameter that described cutting parameter is stored in described encoding code stream is concentrated.
Wherein, the operation principle of described code device can be with reference to the description among the preceding method embodiment.
The code device of the embodiment of the invention in the process of coding, for basic tomographic image and enhancement layer image in the meeting-place scene that obtains, but is encoded as basic layer, the enhancement layer of layered video encoding and decoding SVC respectively.The encoding code stream of Xing Chenging has in this manner made full use of the characteristic of SVC coded system, can comprise the code stream of the image correspondence of a plurality of different resolutions in the encoding code stream that forms.Therefore, utilize the code device of the embodiment of the invention, can improve the quality of image shown when realizing that the many scenes in meeting-place show.
As shown in figure 10, the embodiment of the invention ten also provides a kind of decoding device, comprising:
Code stream receiving element 1001, be used for the received code code stream, but wherein said encoding code stream is to obtain by the basic tomographic image in the scene of meeting-place is encoded as the enhancement layer of described SVC as the basic layer of layered video encoding and decoding SVC, with the enhancement layer image in the scene of meeting-place;
Code stream acquiring unit 1002 is used for obtaining basic layer bit stream and enhancement layer bitstream respectively according to described encoding code stream;
Wherein, described code stream acquiring unit 1002 can comprise: the identification (RNC-ID) analytic module is used for reading the code stream identification of described encoding code stream; The code stream acquisition module is used for obtaining respectively according to described code stream identification the basic layer bit stream and the enhancement layer bitstream of described encoding code stream.
Wherein, described decoding unit 1003 can comprise: the 6th image collection module is used for described basic tomographic image is carried out the decoded reference pictures that up-sampling obtains described enhancement layer bitstream; The 7th image collection module is used to utilize described decoded reference pictures that described enhancement layer bitstream is decoded, and obtains enhancement layer image.
In order to save decode resources, described decoding unit 1003 also can comprise: judge module is used to judge whether and need decodes to described enhancement layer bitstream.The described foundation that need decode to described enhancement layer bitstream that judges whether can be that whether the display terminal of decoding end supports the function that topography amplifies, and is the described enhancement layer bitstream of then decoding, otherwise does not decode; Perhaps, even if the display terminal of decoding end is supported the function that topography amplifies, also judge whether the demand that topography amplifies, for example whether detected the instruction that topography amplifies, if, then decoding needs the enhancement layer bitstream of topography's correspondence of amplification, does not then decode for other enhancement layer bitstreams.Certainly, also have other criterion, enumerate no longer one by one herein.
Described decoding unit also can comprise: the parameter parsing module, the slice header of the described encoding code stream that is used to decode obtains the picture parameter set of described encoding code stream, and obtains described sequence parameter set by described picture parameter set.At this moment, described code stream acquisition module 1002 specifically is used to utilize described sequence parameter set, described decoded reference pictures that described enhancement layer bitstream is decoded, and obtains enhancement layer image.
In addition, in order to save decode resources, improve decoding efficiency, described several parsing modules also are used to obtain the cutting parameter that described sequential parameter is concentrated storage; Described code stream acquisition module specifically is used to utilize described sequence parameter set, cutting parameter and described decoded reference pictures that described enhancement layer bitstream is decoded, and obtains the enhancement layer image in the determined zone of described cutting parameter.
In addition, described decoding device also can comprise: display unit is used to show described basic tomographic image and enhancement layer image.
Wherein, the operation principle of described decoding device can be with reference to the description among the preceding method embodiment.
The decoding device of the embodiment of the invention owing in the process of coding, be basic tomographic image and enhancement layer image with the meeting-place scene, but respectively as the basic layer of layered video encoding and decoding SVC, enhancement layer is encoded and form encoding code stream.That is to say the encoding code stream that forms in this manner, made full use of the characteristic of SVC coded system, in the encoding code stream that forms, can comprise the code stream of the image correspondence of a plurality of different resolutions.Therefore, can guarantee to utilize the basic tomographic image that decoding device obtained of the embodiment of the invention and the quality of enhancement layer image, thereby improve the quality of image shown when realizing that the many scenes in meeting-place show.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (24)
1. a coding method is characterized in that, comprising:
Obtain the basic tomographic image of a width of cloth and at least one width of cloth enhancement layer image in the scene of meeting-place respectively;
But described basic tomographic image as the basic layer of layered video encoding and decoding SVC, described enhancement layer image is encoded as the enhancement layer of described SVC, is formed encoding code stream.
2. method according to claim 1 is characterized in that, the described basic tomographic image of a width of cloth and at least one width of cloth enhancement layer image that obtains respectively in the scene of meeting-place comprises:
Obtain identical but the image that resolution is different of scene at least two described meeting-place scenes, with the described image that obtains respectively as described enhancement layer image;
In the described image that obtains, select the little image of resolution to carry out down-sampling, obtain described basic tomographic image.
3. method according to claim 1 is characterized in that, the described basic tomographic image of a width of cloth and at least one width of cloth enhancement layer image that obtains respectively in the scene of meeting-place comprises:
Obtain at least one width of cloth meeting-place scene image;
With described meeting-place scene image as enhancement layer image or to described meeting-place scene image carry out obtaining behind the down-sampling enhancement layer image or the image that carries out obtaining behind the down-sampling with described meeting-place scene image and to described meeting-place scene image as enhancement layer image;
Width of cloth in the scene image of described meeting-place is carried out down-sampling, obtain basic tomographic image, the resolution of wherein said basic tomographic image is not more than the resolution of arbitrary described enhancement layer image.
4. method according to claim 1 is characterized in that, but described with described basic tomographic image as the basic layer of layered video encoding and decoding SVC, described enhancement layer image is encoded as the enhancement layer of described SVC, form encoding code stream and comprise:
Described basic tomographic image is carried out the coded reference image that up-sampling obtains described enhancement layer image;
Adopt H.264 method to encode as the basic layer of described SVC described basic tomographic image, utilize described coded reference image that described enhancement layer image is encoded as the enhancement layer of described SVC, form encoding code stream.
5. method according to claim 4 is characterized in that, described method also comprises:
Obtain the cutting parameter of described enhancement layer image;
The sequential parameter that described cutting parameter is stored in described encoding code stream is concentrated.
6. according to claim 4 or 5 described methods, it is characterized in that described coded reference image and described basic tomographic image are with image constantly.
7. method according to claim 1 is characterized in that, but described with described basic tomographic image as the basic layer of layered video encoding and decoding SVC, described enhancement layer image is encoded as the enhancement layer of described SVC, form encoding code stream and comprise:
But with described basic tomographic image as the basic layer of layered video encoding and decoding SVC, described enhancement layer image is encoded as the enhancement layer of described SVC, and be respectively the basic layer bit stream of described basic tomographic image correspondence and the enhancement layer bitstream interpolation code stream identification of described enhancement layer image correspondence, form encoding code stream.
8. a coding/decoding method is characterized in that, comprising:
The received code code stream, but wherein said encoding code stream is to obtain by the basic tomographic image in the scene of meeting-place is encoded as the enhancement layer of described SVC as the basic layer of layered video encoding and decoding SVC, with the enhancement layer image in the scene of meeting-place;
Obtain basic layer bit stream and enhancement layer bitstream respectively according to described encoding code stream;
Respectively described basic layer bit stream and enhancement layer bitstream are decoded, obtain described basic tomographic image and described enhancement layer image.
9. method according to claim 8 is characterized in that, describedly obtains basic layer bit stream respectively and enhancement layer bitstream comprises according to described encoding code stream:
Read the code stream identification in the described encoding code stream;
Obtain basic layer bit stream and enhancement layer bitstream in the described encoding code stream respectively according to described code stream identification.
10. method according to claim 8 is characterized in that, described enhancement layer bitstream is being decoded, and comprises when obtaining enhancement layer image:
Described basic tomographic image is carried out the decoded reference pictures that up-sampling obtains described enhancement layer bitstream;
Utilize described decoded reference pictures that described enhancement layer bitstream is decoded, obtain described enhancement layer image.
11. method according to claim 10 is characterized in that, described obtain the decoded reference pictures of described enhancement layer bitstream according to described basic tomographic image before, described method also comprises:
Judge whether and to decode to described enhancement layer bitstream.
12., it is characterized in that according to claim 10 or 11 described methods, when comprising sequence parameter set in the described encoding code stream, describedly utilize described decoded reference pictures that described enhancement layer bitstream is decoded, obtain enhancement layer image and comprise:
The decode slice header of described encoding code stream obtains the picture parameter set of described encoding code stream;
Obtain described sequence parameter set by described picture parameter set;
Utilize described sequence parameter set, described decoded reference pictures that described enhancement layer bitstream is decoded, obtain described enhancement layer image.
13. method according to claim 12 is characterized in that, described obtain described sequence parameter set by described picture parameter set after, described method also comprises:
Obtain the wherein cutting parameter of storage according to described sequence parameter set;
Described described sequence parameter set, the described decoded reference pictures utilized decoded to described enhancement layer bitstream, obtains described enhancement layer image and comprises:
Utilize described sequence parameter set, cutting parameter and described decoded reference pictures that described enhancement layer bitstream is decoded, obtain the enhancement layer image in the determined zone of described cutting parameter.
14. a code device is characterized in that, comprising:
Image acquisition unit is used for obtaining respectively the basic tomographic image of a width of cloth and at least one width of cloth enhancement layer image of meeting-place scene;
Coding unit, but be used for described basic tomographic image forming encoding code stream as the basic layer of layered video encoding and decoding SVC, described enhancement layer image is encoded as the enhancement layer of described SVC.
15. device according to claim 14 is characterized in that, described image acquisition unit comprises:
First image collection module be used for obtaining identical but the image that resolution is different of at least two width of cloth meeting-place scene scenes, and the described image that will obtain is as described enhancement layer image;
Second image collection module is used at the described image that obtains, and selects the little image of resolution to carry out down-sampling, obtains described basic tomographic image.
16. device according to claim 14 is characterized in that, described image acquisition unit comprises:
The 3rd image collection module is used to obtain at least one width of cloth meeting-place scene image;
The 4th image collection module, be used for described meeting-place scene image as enhancement layer image or to described meeting-place scene image carry out obtaining behind the down-sampling enhancement layer image or the image that carries out obtaining behind the down-sampling with described meeting-place scene image and to described meeting-place scene image as enhancement layer image;
The 5th image collection module is used for a width of cloth of described meeting-place scene image is carried out down-sampling, obtains basic tomographic image, and the resolution of wherein said basic tomographic image is not more than the resolution of arbitrary described enhancement layer image.
17. device according to claim 14 is characterized in that, described coding unit comprises:
The coded reference image collection module is used for described basic tomographic image is carried out the coded reference image that up-sampling obtains described enhancement layer image;
Coding module, be used for adopting H.264 method to encode as the basic layer of described SVC described basic tomographic image, utilize described coded reference image that described enhancement layer image is encoded as the enhancement layer of described SVC, and be respectively the basic layer bit stream of described basic tomographic image correspondence and the enhancement layer bitstream interpolation code stream identification of described enhancement layer image correspondence, form encoding code stream.
18. device according to claim 17 is characterized in that, described coding unit also comprises:
Parameter acquisition module is used to obtain the cutting parameter of described enhancement layer image;
Described coding module also is used for when forming encoding code stream, and the sequential parameter that described cutting parameter is stored in described encoding code stream is concentrated.
19. a decoding device is characterized in that, comprising:
The code stream receiving element, be used for the received code code stream, but wherein said encoding code stream is to obtain by the basic tomographic image in the scene of meeting-place is encoded as the enhancement layer of described SVC as the basic layer of layered video encoding and decoding SVC, with the enhancement layer image in the scene of meeting-place;
The code stream acquiring unit is used for obtaining basic layer bit stream and enhancement layer bitstream respectively according to described encoding code stream;
Decoding unit is used for respectively described basic layer bit stream and enhancement layer bitstream being decoded, and obtains described basic tomographic image and described enhancement layer image.
20. device according to claim 19 is characterized in that, described code stream acquiring unit comprises:
The identification (RNC-ID) analytic module is used for reading the code stream identification of described encoding code stream;
The code stream acquisition module is used for obtaining respectively according to described code stream identification the basic layer bit stream and the enhancement layer bitstream of described encoding code stream.
21. device according to claim 19 is characterized in that, described decoding unit comprises:
The 6th image collection module is used for described basic tomographic image is carried out the decoded reference pictures that up-sampling obtains described enhancement layer bitstream;
The 7th image collection module is used to utilize described decoded reference pictures that described enhancement layer bitstream is decoded, and obtains enhancement layer image.
22. device according to claim 21 is characterized in that, described decoding unit also comprises:
Judge module is used to judge whether and need decodes to described enhancement layer bitstream.
23., it is characterized in that described decoding unit also comprises according to claim 21 or 22 described devices:
The parameter parsing module, the slice header of the described encoding code stream that is used to decode obtains the picture parameter set of described encoding code stream, and obtains described sequence parameter set by described picture parameter set;
Described code stream acquisition module specifically is used to utilize described sequence parameter set, described decoded reference pictures that described enhancement layer bitstream is decoded, and obtains enhancement layer image.
24. device according to claim 23 is characterized in that, described parameter parsing module also is used to obtain the cutting parameter that described sequential parameter is concentrated storage;
Described code stream acquisition module specifically is used to utilize described sequence parameter set, cutting parameter and described decoded reference pictures that described enhancement layer bitstream is decoded, and obtains the enhancement layer image in the determined zone of described cutting parameter.
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