CN102630008A - Method and terminal for wireless video transmission - Google Patents
Method and terminal for wireless video transmission Download PDFInfo
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- CN102630008A CN102630008A CN2011102962905A CN201110296290A CN102630008A CN 102630008 A CN102630008 A CN 102630008A CN 2011102962905 A CN2011102962905 A CN 2011102962905A CN 201110296290 A CN201110296290 A CN 201110296290A CN 102630008 A CN102630008 A CN 102630008A
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Abstract
The invention, which relates to the video transmission technology field, discloses a method and a terminal for wireless video transmission, so that transmission efficiency of a wireless video can be effectively improved. The wireless video transmission method comprises: obtaining video data; carrying out coding on the obtained video data by using a distributed coding mode; and transmitting the video data by a wireless channel, wherein the video data have been coded by the distributed coding mode. The provided method and the terminal can be applied to the wireless video transmission technology.
Description
Technical field
The present invention relates to the video transmission technologies field, relate in particular to a kind of wireless video transmission method and terminal.
Background technology
In recent years, along with fast wireless network and the development that has been equipped with the radio hand-held equipment with video acquisition, coding, transmittability of camera, the real-time Transmission of the video data of big data quantity on wireless network obtained application more and more widely.
Owing to contain much information, video data need carry out encoding compression usually before transmission.Existing video compression coding mode; As H.264 encode or MPEG (Moving Pictures Experts Group; Coding dynamic image expert group) coding etc.; Cataloged procedure need pass through the calculating of a large amount of high complexities such as estimation, conversion, quantification, entropy coding, thereby needs powerful hardware supports and energy supply.
And send the terminal for wireless video; Its battery capacity is limited, calculating and storage capacity are limited; Therefore; The calculating of the high complexity of above-mentioned coded system is sent the hardware resource and the energy at terminal with the lot of consumption wireless video, sends the efficiency of transmission of terminal to wireless video thereby obviously reduced wireless video.
Summary of the invention
Main purpose of the present invention is, a kind of wireless video transmission method and terminal are provided, and can effectively improve the efficiency of transmission of wireless video.
For achieving the above object, the present invention adopts following technical scheme:
A kind of wireless video transmission method comprises:
Obtain video data;
Use the distributed coding mode to the said coding video data that obtains;
Send the video data after said use distributed coding mode is encoded through wireless channel.
A kind of wireless video transmission method comprises:
Receive the video data that uses the distributed coding mode to encode through wireless channel;
Video data to said reception carries out distributed decoding;
Send said distributed decoded video data.
A kind of wireless video transmission terminal comprises:
Acquiring unit is used to obtain video data;
The distributed coding unit is used to the coding video data that uses the distributed coding mode that said acquiring unit is obtained;
First transmitting element is used for sending the video data behind the said distributed coding cell encoding through wireless channel.
A kind of wireless video transmission terminal comprises:
Receiving element is used for receiving the video data that uses the distributed coding mode to encode through wireless channel;
Distributed decoding unit is used for the video data that said receiving element receives is carried out distributed decoding;
Second transmitting element is used to send the video data after the said distributed decoding unit decodes.
Wireless video transmission method and terminal that the embodiment of the invention provides; Use the distributed coding mode that video data is sent through wireless channel through simple code compression back; The distributed coding mode not only can be removed redundant informations a large amount of in the video data; Guarantee video quality when reducing the video Data Transmission amount, and because the cataloged procedure of distributed coding is simple relatively, amount of calculation resource little, that take is few; Thereby make the wireless video transmission terminal when carrying out the wireless video transfer of data; Can utilize short time, less memory headroom or energy with video data compaction coding, therefore effectively improve the efficiency of transmission of wireless video, significantly promote the performance of wireless video transmission terminal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the 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 property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the sketch map of the wireless video transmission system of application wireless video transmission method provided by the invention;
A kind of flow chart of the wireless video transmission method that Fig. 2 provides for the embodiment of the invention;
The another kind of flow chart of the wireless video transmission method that Fig. 3 provides for the embodiment of the invention;
A kind of detailed maps of the wireless video transmission method that Fig. 4 provides for the embodiment of the invention;
The another kind of detailed maps of the wireless video transmission method that Fig. 5 provides for the embodiment of the invention;
A kind of structural representation of the wireless video transmission terminal that Fig. 6 provides for the embodiment of the invention;
The another kind of structural representation of the wireless video transmission terminal that Fig. 7 provides for the embodiment of the invention;
The another kind of structural representation of the wireless video transmission terminal that Fig. 8 provides for the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, 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 are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
In order the embodiment of the invention to be done clear detailed description, at first the wireless video transmission system of using wireless video transmission method provided by the invention is done brief description.
As shown in Figure 1; Wireless video transmission system comprises first terminal 1 and second terminal 2; Wherein, First terminal 1 can be the portable terminal that wireless camera, video sensor, mobile phone etc. have video acquisition, coding and sending function, and second terminal 2 can be the terminal that computer etc. has strong operational capability and handling property.First terminal 1 can be with obtaining next video data to send to second terminal 2 through wireless channel, so that 2 pairs of these video datas in second terminal are further handled.
In conjunction with illustrated in figures 1 and 2, the embodiment of the invention provides a kind of wireless video transmission method, based on said first terminal, comprising:
S11 obtains video data;
Concrete, in this step, the method for obtaining video data can have multiple.For example; Can obtain video data in real time through the video information of the first-class video capture device collection of making a video recording; Can be stored in internal memory or the disk file is obtained video data through reading yet, can also obtain video data through alternate manner certainly, the present invention does not do qualification to this.
S12 uses the distributed coding mode to the said coding video data that obtains;
Distributed coding is a kind of coding framework, has lower coding computation complexity and higher decoding computation complexity, and therefore, the cataloged procedure of distributed coding mode is simple and decode procedure is complicated.
Because video information is made up of the still image of a frame one frame, the video coding and decoding also just comprises two types of motion prediction coding and decodings between the interior coding and decoding of frame and frame and the frame accordingly.Comparatively speaking, the computation complexity of the motion prediction coding and decoding between frame and the frame will be far longer than the computation complexity of coding and decoding in the frame.
Distributed coding utilizes the coding characteristic of above-mentioned video data to reduce the coding computation complexity just.Concrete, distributed coding is regarded each frame video image as " independent source ", carries out absolute coding between each frame, and computation complexity is lower; And being transferred to decoding end, the inter prediction higher calculating of complexity such as (like estimation) carries out.The equipment of decoding end such as computer etc. have stronger operational capability and disposal ability usually, and therefore, even the amount of calculation that decode operation needs is complicated, decoding end equipment also can be with its efficient completion.
In this step; At the coding video data of first end utilization distributed coding mode to obtaining; Not only guaranteed the quality of good video image; Can also remove redundant informations a large amount of in the video data, reduce the video Data Transmission amount, thereby the information that has reduced wireless channel transmits pressure.
Because the cataloged procedure of distributed coding is simple relatively, amount of calculation resource little, that take is few, thereby can make first terminal when carrying out the wireless video transmission, can utilize short time, less memory headroom or energy with video data compaction coding; Carry out and decoding end is transferred in the inter prediction higher calculating of complexity such as (like estimation), thereby realized the lower coding computation complexity of coding side, reduce of the consumption of first terminal resource.
S13 sends the video data after said use distributed coding mode is encoded through wireless channel.
Wherein, wireless channel both can be the wireless narrow band channel in the telecommunication path, also can be wireless ethernet, can also be WLAN etc.
The wireless video transmission method that the embodiment of the invention provides; Use the distributed coding mode that video data is sent through wireless channel through simple code compression back; The distributed coding mode not only can be removed redundant informations a large amount of in the video data; Guarantee video quality when reducing the video Data Transmission amount, and because the cataloged procedure of distributed coding is simple relatively, amount of calculation resource little, that take is few; Thereby make first terminal when carrying out the wireless video transfer of data; Can utilize short time, less memory headroom or energy with video data compaction coding, therefore effectively improve the efficiency of transmission of wireless video, significantly promote the performance at first terminal.
Concrete; Because the distributed coding mode that the embodiment of the invention provides has lower coding computation complexity; Take less resource during coding; Therefore be suitable for being applied in portable, power consumption is low, operational capability and all limited wireless video terminal of transmission bandwidth, like the node of mobile phone or wireless video sensing network etc.
Accordingly, in conjunction with Fig. 1 and shown in Figure 3, the embodiment of the invention also provides a kind of wireless video transmission method, based on second terminal, comprising:
S21 receives the video data that uses the distributed coding mode to encode through wireless channel;
Optional, wireless channel both can be the wireless narrow band channel in the telecommunication path, also can be wireless ethernet, can also be WLAN etc.
Wherein, the distributed coding mode has been carried out detailed explanation in the embodiment shown in Figure 2, repeats no more here.
S22 carries out distributed decoding to the video data of said reception;
Because video information is made up of the still image of a frame one frame, the video coding and decoding also comprises two types of motion prediction coding and decodings between the interior coding and decoding of frame and frame and the frame.Comparatively speaking, the computation complexity of the motion prediction coding and decoding between frame and the frame will be far longer than the computation complexity of coding and decoding in the frame.
Because in order to reduce the coding computation complexity at first terminal, distributed coding is regarded each frame video image as " independent source ", carries out absolute coding between each frame in the previous embodiment.Yet in order to guarantee the continuity of the video image information between frame and the frame, the work of inter-frame video data computing is just carried out when the distributed decoding by decoding end.In fact, because second terminal is generally computer or other has the equipment that enriches available resources, therefore, though the inter-frame video data computing, like estimation etc., computation complexity is higher, and second terminal also can efficiently be accomplished.
S23 sends said distributed decoded video data.
Optional, in this step, distributed decoded video data can be sent through wired or wireless channel in second terminal, is further handled by remote equipment so that this video data can show perhaps through display device.
Concrete; When display device such as display adopt wired mode to link to each other with second terminal such as host computer; Because the message transmission rate of wire message way is fast, stability is high, second terminal can directly decoded video data be sent to display device so that display device shows this video image.
And work as display device is mobile device; During like mobile phone; In order to save radio channel resource, to reduce radio transmitted power, guarantee the transmission quality of video data simultaneously, further; Can encode distributed decoded video data once more in second terminal, and the video data after will encoding once more sends to display device.At this moment, at the display device place, can realize video playback as long as this video data decoded accordingly.
Optional, can encode distributed decoded video data through multiple coded system once more in second terminal, and the present invention does not limit this.But when display device was mobile device, because the available resources of mobile device are limited, the decode operation of its execution should take the available resources of mobile device as far as possible less.Therefore, preferable, in this step, once more the coded system of coding should be corresponding the low decoding process of computation complexity, like mpeg encoded or coding etc. H.264.
The wireless video transmission method that the embodiment of the invention provides; Use the distributed coding mode with the video data encoding that obtains in first end, and send to second terminal, carry out distributed decoding in second end through wireless channel; Reduced the coding computation complexity at first terminal through the higher distributed decoding of the second terminal computation complexity; Not only removed the bulk redundancy information of the video data of first terminal transmission, alleviated the transmission pressure of wireless channel when having guaranteed video quality, and made full use of the available resources at second terminal; The calculating that complexity is high is carried out at second terminal; Thereby the computation complexity of the cataloged procedure at first terminal is reduced greatly, make first terminal can utilize short time, less memory headroom or energy that video data encoding is compressed, thereby practiced thrift the resource at first terminal; Effectively improve the efficiency of transmission of wireless video, significantly promoted the performance at first terminal.
Through specific embodiment the wireless video transmission method that the embodiment of the invention provides is elaborated below.
The sketch map of the wireless video transmission method that Fig. 4 and Fig. 5 provide for the embodiment of the invention, as shown in Figure 4, the wireless video transmission of distributed coding end specifically comprises the steps:
For first terminal:
S301. first terminal obtains video data;
S302. first terminal is divided into the first frame group video data and the second frame group video data with the said video data that obtains by the difference that said video data belongs to frame;
Need to prove that the division methods of video data can be multiple,, the even frame video data is divided in another group, perhaps divide into groups according to the further feature of video data video data with the needs coding transmission as the odd-numbered frame video data is divided at one group.The present invention does not limit this.
Concrete, in this step, the first frame group video data is an odd-numbered frame group video data, and its frame number is 2n-1, and n is the integer greater than zero, and the second frame group video data is an even frame group video data, and its frame number is 2n, and n is the integer greater than zero; In the video data that promptly in step S301, obtains, the 1st, 3,5...... frame video data is the first frame group video data, the 2nd, 4,6...... frame video data is the second frame group video data.
S303. said first frame group video data first mode of carrying out is encoded at first terminal;
H.264 or the MPEG of dynamic image expert group optional, said first mode is for.Need to prove; Video data after encoding through first mode has removed a large amount of redundant information in the video data of source, and the data processing to the first frame group video data in the later step of this step all is based on the further processing to the first mode encoded video data.
S304. the first frame group video data after said first mode is encoded at first terminal carries out said first mode and decodes;
S305. wavelet transformation is carried out to the difference of said second frame group video data and the decoded first frame group video data of said first mode in first terminal;
In this step; With the second frame group video data is that the decoded first frame group video data of the even frame group data and first mode is that odd-numbered frame group data are carried out subtraction, obtains the poor of the decoded first frame group video data of the second frame group video data and first mode.Concrete, can use frame number in the even frame group data to deduct as the video data of 2n that frame number is the video data of 2n-1 in the odd-numbered frame group data.
Like this; Through behind the subtraction of video data; The data of gained only comprise different portions in two groups of video datas; Again because adjacent two frame video data difference are less, so the data volume behind the subtraction reduces than the video data itself of the first frame group data or the second frame group data greatly.
And then; Utilize the result of above-mentioned subtraction; Through the difference of the second frame group video data and the decoded first frame group video data of first mode is carried out wavelet transformation, the correlation data about the first frame group video data and the second frame group video data is transformed to wavelet field.
S306. the video data of first terminal after to said wavelet transformation carries out lattice vector quantization;
Understandable; Vector quantization has good quantification performance, and lattice vector quantization quantizes to compare with conventional vector, need not carry out complicated nearest neighbor search; Also need not carry out the code book storage, so its fast algorithm can effectively reduce the calculation of coding complexity.
S307. video data carry out second mode of first terminal after to said lattice vector quantization encoded, and said second mode is LDPC (Low Density Parity Check Code, a low density parity check code);
In this step, second mode of carrying out of the video data behind the lattice vector quantization among the step S306 is encoded.Preferably, second mode is encoded and is had lower computation complexity, for example, and can be for LDPC coding etc.
S308. first terminal is sent the first frame group video data after said first mode is encoded, is sent the video data after said second mode is encoded through wireless channel through wireless channel.
Accordingly, as shown in Figure 5, in decoding end, the wireless video transmission method that present embodiment provides comprises the steps:
Based on second end side:
S401. the first frame group video data after second terminal receives first mode and encodes through wireless channel, H.264 or the MPEG of dynamic image expert group said first mode is for; With the video data that receives through wireless channel after said second mode is encoded, said second mode is LDPC;
Need to prove; Because in step S305; Wavelet transformation is carried out to the difference of the second frame group video data and the decoded first frame group video data of first mode in first terminal; After passing through the processing of step S306 and step S307 again, in step S308, send, thus the video data behind second coding that receives in this step also corresponding the second frame group video data and the decoded first frame group video data of first mode poor among the step S305.
S402. the first frame group video data after first mode said reception, said being encoded carries out said first mode and decodes;
Need to prove, the distributed decoding that present embodiment provides, the computation complexity of second end decoding is higher, and has reduced the computation complexity of the first end distributed coding with the decoding of high computation complexity.
Concrete; In this step; First frame group video data first mode of carrying out after first mode encoded is decoded, and the decoded first frame group video data can directly become the part of distributed decoded video data on the one hand, on the other hand; When the second frame group video data that in to step S401, receives is decoded, also can utilize the decoded first frame group video data of this first mode.
S403. the decoded first frame group video data of said first mode is carried out wavelet transformation;
In this step, with the decoded first frame group data conversion of first mode to wavelet field to carry out further data processing;
S404. the first frame group video data behind the said wavelet transformation is carried out lattice vector quantization;
S405. the video data after second mode said reception, said being encoded carries out said second mode and decodes;
In this step, can utilize the first frame group data behind the lattice vector quantization among the step S404, video data second mode of carrying out after second mode is encoded is decoded.
S406. obtain the quantized value sum behind decoded video data of said second mode and the said lattice vector quantization;
Wherein, The decoded video data of second mode corresponding the second frame group video data and the decoded first frame group video data of first mode poor among the step S401; Second frame group video data described in also promptly corresponding the step S305 and the decoded first frame group video data of first mode poor; Therefore; In this step, obtain the quantized value sum behind decoded video data of said second mode and the said lattice vector quantization, promptly obtained corresponding to the second frame group video data among the step S305.
S407. the quantized value sum behind decoded video data of said second mode and the said lattice vector quantization is carried out inverse quantization.
S408. the video data behind the said inverse quantization is carried out wavelet inverse transformation, to obtain the second frame group video data;
S409. send the second frame group video data behind the said wavelet inverse transformation; With
Send the said first frame group video data that said first mode is decoded that carries out.
Need to prove; In this step; The first frame group video data that sends and the second frame group video data corresponding respectively the first frame group video data of dividing among the step S302, i.e. the odd-numbered frame video data and second frame group video data, i.e. the even frame group video data.
Need to prove that correspondence is meant that corresponding frame number is identical, and the particular content of the video data that frame number is identical in step S302 and this step can be identical, also can be close.Because in the process of coding or decoding, possibly remove redundant informations a large amount of in the video data among the step S302, under the prerequisite that does not influence video quality, reduce the video data volume.
Optional; In this step; Before sending video data; Can also encode once more to second frame group video data behind the wavelet inverse transformation and the decoded first frame group video data of first mode, as H.264 encoding, and the video data after will encoding sends through wire message way or wireless channel.Because H.264 behind the coding, the video data volume reduces, anti-interference strengthens, and therefore more helps the transmission of video data in wire message way or wireless channel.
The wireless video transmission method that the embodiment of the invention provides; Use the distributed coding mode with the video data encoding that obtains in first end, and send to second terminal, carry out distributed decoding in second end through wireless channel; Reduced the coding computation complexity at first terminal through the higher distributed decoding of the second terminal computation complexity; Not only removed the bulk redundancy information of the video data of first terminal transmission, alleviated the transmission pressure of wireless channel when having guaranteed video quality, and made full use of the available resources at second terminal; The calculating that complexity is high is carried out at second terminal; Thereby the computation complexity of the cataloged procedure at first terminal is reduced greatly, make first terminal can utilize short time, less memory headroom or energy that video data encoding is compressed, thereby practiced thrift the resource at first terminal; Effectively improve the efficiency of transmission of wireless video, significantly promoted the performance at first terminal.
Further, in conjunction with Fig. 4 and Fig. 5, obtain accurate more side information in order to make distributed coding; Thereby improve the performance of distributed coding; In another embodiment of the present invention, step S306 is the generating quantification index information in lattice vector quantization, then after step S306; Before the step S308, present embodiment also comprises:
S3071. arithmetic coding is carried out to the quantization index information of said generation in first terminal;
Then step S308 also comprised through wireless channel and sent the quantization index information behind the said arithmetic coding this moment.
Then, among the step S401, also comprise, so that distributed coding obtains the more accurately performance of side information, raising distributed coding through the quantization index information behind the wireless channel reception arithmetic coding; At this moment, among the step S404 the first frame group video data behind the said wavelet transformation is carried out lattice vector quantization and be specially, carry out lattice vector quantization according to the quantization index information of the said reception first frame group video data after to said wavelet transformation.
Need to prove that in the method for transmitting video data provided by the invention, among the step S306, the concrete grammar that the video data of first terminal after to said wavelet transformation carries out lattice vector quantization can have multiple, the present invention does not limit this.For example, in order further to remove the redundant information in the lattice vector quantization, in one embodiment of the invention, the video data of first terminal after to said wavelet transformation carries out lattice vector quantization and can comprise the steps:
Step 1: respectively the video data behind the said wavelet transformation is carried out first lattice vector quantization and second lattice vector quantization; The precision of said first lattice vector quantization is higher than the precision of said second lattice vector quantization;
Step 2: export the poor of quantized value and the quantized value behind said second lattice vector quantization behind said first lattice vector quantization;
At this moment; Among the step S307, video data carry out second mode of first terminal after to said lattice vector quantization encoded and be specially: difference second mode of carrying out to quantized value behind said first lattice vector quantization of exporting in the step 2 and the quantized value behind said second lattice vector quantization is encoded.Through the video data behind the wavelet transformation being carried out, and the difference of the quantized value of two types of lattice vector quantizations sent to decoding end, promptly can further remove the redundant information in the video data like two types of lattice vector quantizations that precision is different in the step 1.
So, corresponding, for second terminal, behind step S407, the wireless video transmission method that the embodiment of the invention provides also comprises:
S4071. according to the first frame group video data behind the said wavelet transformation, the video data behind the said inverse quantization is carried out reconstruct;
At this moment, among the step S408 video data behind the said inverse quantization is carried out wavelet inverse transformation to obtain the second frame group video data, be specially the video data after the reconstruct among the step S4071 is carried out wavelet inverse transformation, to obtain the second frame group video data.
Corresponding, as shown in Figure 6 with aforesaid wireless video transmission method, the present invention also provides a kind of wireless video transmission terminal, and first terminal corresponding in the wireless video transmission system shown in Figure 1 comprises:
Acquiring unit 101 is used to obtain video data;
Distributed coding unit 102 is used to the coding video data that uses the distributed coding mode that said acquiring unit is obtained;
First transmitting element 103 is used for sending the video data behind the said distributed coding cell encoding through wireless channel.
The wireless video transmission terminal that the embodiment of the invention provides; Use the distributed coding mode that video data is sent through wireless channel through simple code compression back; The distributed coding mode not only can be removed redundant informations a large amount of in the video data; Guaranteed video quality when reducing the video Data Transmission amount, and because the cataloged procedure of distributed coding is simple relatively, amount of calculation resource little, that take is few; Thereby make the wireless video transmission terminal when carrying out the wireless video transfer of data; Can utilize short time, less memory headroom or energy with video data compaction coding, therefore effectively improve the efficiency of transmission of wireless video, significantly promote the performance of wireless video transmission terminal.
Concrete, as shown in Figure 6, in this enforcement, distributed coding unit 102 comprises:
Optional, in one embodiment of the invention, the first frame group video data that divides frame module 1021 to divide is an odd-numbered frame group video data, the second frame group video data that divides frame module 1021 to divide is an even frame group video data; Certainly, the first frame group video data that divides frame module 1021 to divide also can be even frame group video data, and the second frame group video data that divides frame module 1021 to divide also can be odd-numbered frame group video data.
Need to prove; In other embodiments of the invention; Dividing the division of the frame module 1021 pairs first frame groups video data and the second frame group video data can also be other division methods; In every three adjacent frame video datas, there is a frame to be divided in the first frame group video data, there are two frames to be divided in the second frame group video data.The present invention does not limit this.
H.264 or the MPEG of dynamic image expert group the first mode coding module 1022 is used for first frame group video data first mode of carrying out that minute frame module 1021 is divided is encoded, and said first mode is for;
The first mode decoder module 1023 is used for that the first frame group video data behind the first mode coding module, 1022 codings is carried out said first mode and decodes;
The first wavelet transformation module 1024 is used for the second frame group video data of frame module 1021 divisions in said minute and the difference of the first mode decoder module, the 1023 decoded first frame group video datas are carried out wavelet transformation;
The second mode coding module 1026 is used for video data second mode of carrying out behind first quantization modules, 1025 lattice vector quantizations is encoded, and said second mode is LDPC;
Then, first transmitting element 103 specifically is used for:
Send the first frame group video data after the said first mode coding module 1021 is encoded through wireless channel; With the video data that sends through wireless channel after the said second mode coding module 1026 is encoded.
Further, wireless video transmission terminal provided by the invention also comprises arithmetic coding module 1027, and the quantization index information that produces when being used for that first quantization modules 1025 carried out lattice vector quantization is carried out arithmetic coding;
Then, said first transmitting element 103 also is used for sending the quantization index information behind said arithmetic coding module 1027 arithmetic codings through wireless channel.
Preferable, in order further to reduce the redundant information of video data in the vector quantization, in one embodiment of the invention, first quantization modules 1025 can specifically be used for:
Respectively the video data behind the first wavelet transformation module, 1024 wavelet transformations is carried out first lattice vector quantization and second lattice vector quantization; The precision of said first lattice vector quantization is higher than the precision of said second lattice vector quantization;
Export the poor of quantized value and the quantized value behind said second lattice vector quantization behind said first lattice vector quantization;
At this moment, the second mode coding module 1026 specifically is used for: the quantized value behind first lattice vector quantization of said first quantization modules output and difference second mode of carrying out of the quantized value behind said second lattice vector quantization are encoded.
Accordingly, as shown in Figure 7, the present invention also provides a kind of wireless video transmission terminal, belongs to second terminal in the wireless video transmission system shown in Figure 1, and said wireless video transmission terminal comprises:
Receiving element 201 is used for receiving the video data that uses the distributed coding mode to encode through wireless channel;
Distributed decoding unit 202 is used for the video data that receiving element 201 receives is carried out distributed decoding;
Second transmitting element 203 is used to send distributed decoding unit 202 decoded video datas.
The wireless video transmission terminal that the embodiment of the invention provides; Use the distributed coding mode with the video data encoding that obtains in first end, and send to second terminal, carry out distributed decoding in second end through wireless channel; Reduced the coding computation complexity at first terminal through the higher distributed decoding of the second terminal computation complexity; Not only removed the bulk redundancy information of the video data of first terminal transmission, alleviated the transmission pressure of wireless channel when having guaranteed video quality, and made full use of the available resources at second terminal; The calculating that complexity is high is carried out at second terminal; Thereby the computation complexity of the cataloged procedure at first terminal is reduced greatly, make first terminal can utilize short time, less memory headroom or energy that video data encoding is compressed, thereby practiced thrift the resource at first terminal; Effectively improve the efficiency of transmission of wireless video, significantly promoted the performance at first terminal.
Wherein, receiving element 201 can specifically be used for:
The first frame group video data after receiving first mode and encode through wireless channel, H.264 or the MPEG of dynamic image expert group said first mode is for; With
Receive the video data after said second mode is encoded through wireless channel, said second mode is LDPC;
Concrete, distributed decoding unit 202 comprises:
The first mode decoder module 2021, the first frame group video data after being used for first mode said reception, said encoded carries out said first mode and decodes;
The second wavelet transformation module 2022 is used for the said first mode decoder module, the 2021 decoded first frame group video datas are carried out wavelet transformation;
The second mode decoder module 2024, be used for receiving element 201 is received, the video data of said second mode after encoding carry out said second mode and decode;
Video data after concrete, the second mode decoder module 2024 can be 201 that receive to receiving element according to the video data behind second quantization modules, 2023 lattice vector quantizations, said second mode is encoded carries out said second mode and decodes.
Wavelet inverse transformation module 2027 is used for the video data behind inverse quantization module 2026 inverse quantizations is carried out wavelet inverse transformation, to obtain the second frame group video data;
Then, second transmitting element 203 specifically is used for:
Send the second frame group video data that said wavelet inverse transformation module 2027 obtains; With
Send the said first mode decoder module, the 2021 decoded first frame group video datas.
Optional, in the present embodiment, the first frame group video data that receiving element 201 receives can be odd-numbered frame group video data, then, the second frame group video data that wavelet inverse transformation module 2027 obtains can be even frame group video data.But the invention is not restricted to this; In another embodiment of the present invention; The first frame group video data that receiving element 201 receives can be even frame group video data, and the second frame group video data that wavelet inverse transformation module 2027 obtains can be odd-numbered frame group video data.
Further; In one embodiment of the invention; During quantization index information after first transmitting element 103 of first end side also is used for sending arithmetic coding through wireless channel, receiving element 201 also is used for receiving the quantization index information behind the said arithmetic coding through wireless channel;
At this moment, second quantization modules 2023 specifically is used for: according to the quantization index information of receiving element 201 receptions, to being carried out lattice vector quantization by the first frame group video data behind the second wavelet transformation module, 2022 wavelet transformations.
Optional; In another embodiment of the present invention; Distributed decoding unit 202 also comprises reconstructed module 2028, is used for according to the first frame group video data behind the said second wavelet transformation module, 2022 wavelet transformations video data behind said inverse quantization module 2026 inverse quantizations being carried out reconstruct;
Then this moment, wavelet inverse transformation module 2027 specifically is used for the video data after reconstructed module 2028 reconstruct is carried out wavelet inverse transformation, to obtain the second frame group video data.
In order to save radio channel resource, to reduce radio transmitted power; Guarantee the accurate transmission of video data; Further, as shown in Figure 8, the wireless video transmission terminal that the embodiment of the invention provides also comprises the preceding coding unit 204 of transmission; That be used for receiving element 201 is received and send preceding coding through distributed decoding unit 202 decoded video datas, coding can be H.264 coding or dynamic image expert group mpeg encoded before this sent.
At this moment, second transmitting element 203 specifically is used for, and sends the video data after the preceding coding unit 204 of this transmission is encoded.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, 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 said claim.
Claims (20)
1. a wireless video transmission method is characterized in that, comprising:
Obtain video data;
Use the distributed coding mode to the said coding video data that obtains;
Send the video data after said use distributed coding mode is encoded through wireless channel.
2. method according to claim 1 is characterized in that,
Said use distributed coding mode comprises the said coding video data that obtains:
The said video data that obtains is divided into the first frame group video data and the second frame group video data by the difference that said video data belongs to frame;
H.264 or the MPEG of dynamic image expert group said first frame group video data first mode of carrying out is encoded, and said first mode is for;
The first frame group video data after said first mode encoded carries out said first mode and decodes;
Difference to said second frame group video data and the decoded first frame group video data of said first mode is carried out wavelet transformation;
Video data behind the said wavelet transformation is carried out lattice vector quantization;
Video data behind the said lattice vector quantization second mode of carrying out is encoded, and said second mode is low density parity check code LDPC;
The said video data that sends after said use distributed coding mode is encoded through wireless channel comprises:
Send the first frame group video data after said first mode is encoded through wireless channel; With
Send the video data after said second mode is encoded through wireless channel.
3. method according to claim 2 is characterized in that, said method also comprises:
The quantization index information that is produced when the video data behind the said wavelet transformation is carried out lattice vector quantization is carried out arithmetic coding;
Send the quantization index information behind the said arithmetic coding through wireless channel.
4. method according to claim 2 is characterized in that,
Saidly video data behind the said wavelet transformation carried out lattice vector quantization comprise:
Respectively the video data behind the said wavelet transformation is carried out first lattice vector quantization and second lattice vector quantization; The precision of said first lattice vector quantization is higher than the precision of said second lattice vector quantization;
Export the poor of quantized value and the quantized value behind said second lattice vector quantization behind said first lattice vector quantization;
Saidly video data behind the said lattice vector quantization carried out the second mode encoded packets draw together:
Difference second mode of carrying out to quantized value behind said first lattice vector quantization of said output and the quantized value behind said second lattice vector quantization is encoded.
5. according to each described method of claim 2 to 4, it is characterized in that,
The said first frame group video data is an odd-numbered frame group video data, and the said second frame group video data is an even frame group video data; Perhaps
The said first frame group video data is an even frame group video data, and the said second frame group video data is an odd-numbered frame group video data.
6. a wireless video transmission method is characterized in that, comprising:
Receive the video data that uses the distributed coding mode to encode through wireless channel;
Video data to said reception carries out distributed decoding;
Send said distributed decoded video data.
7. method according to claim 6 is characterized in that,
Said said comprising of video data of using the distributed coding mode to encode through the wireless channel reception:
The first frame group video data after receiving first mode and encode through wireless channel, H.264 or the MPEG of dynamic image expert group said first mode is for; With
Receive the video data after said second mode is encoded through wireless channel, said second mode is low density parity check code LDPC;
Said video data to said reception carries out distributed decoding and comprises:
The first frame group video data after said first mode that receives encoded carries out said first mode and decodes;
The decoded first frame group video data of said first mode is carried out wavelet transformation;
The first frame group video data to behind the said wavelet transformation carries out lattice vector quantization;
Video data after said second mode that receives encoded carries out said second mode and decodes;
Obtain the quantized value sum behind decoded video data of said second mode and the said lattice vector quantization;
Quantized value sum to behind decoded video data of said second mode and the said lattice vector quantization is carried out inverse quantization.
Video data behind the said inverse quantization is carried out wavelet inverse transformation, to obtain the second frame group video data;
The said distributed decoded video data of said transmission comprises:
Send the said second frame group video data; With
Send the said first frame group video data that said first mode is decoded that carries out.
8. method according to claim 7 is characterized in that,
Said method also comprises:
Through the quantization index information behind the wireless channel reception arithmetic coding;
Saidly the first frame group video data behind the said wavelet transformation carried out lattice vector quantization comprise:
According to said quantization index information, the first frame group video data behind the said wavelet transformation is carried out lattice vector quantization.
9. method according to claim 7 is characterized in that,
Said quantized value sum behind decoded video data of said second mode and the said lattice vector quantization is carried out inverse quantization after, said method also comprises:
The first frame group video data according to behind the said wavelet transformation carries out reconstruct to the video data behind the said inverse quantization;
Said video data behind the said inverse quantization is carried out wavelet inverse transformation,, comprising to obtain the second frame group video data:
Video data after the said reconstruct is carried out wavelet inverse transformation, to obtain the second frame group video data.
10. according to the described method of claim 7 to 9, it is characterized in that,
The said first frame group video data is an odd-numbered frame group video data, and the said second frame group video data is an even frame group video data; Perhaps
The said first frame group video data is an even frame group video data, and the said second frame group video data is an odd-numbered frame group video data.
11. a wireless video transmission terminal is characterized in that, comprising:
Acquiring unit is used to obtain video data;
The distributed coding unit is used to the coding video data that uses the distributed coding mode that said acquiring unit is obtained;
First transmitting element is used for sending the video data behind the said distributed coding cell encoding through wireless channel.
12. terminal according to claim 11 is characterized in that,
Said distributed coding unit comprises:
Divide frame module, the video data that is used for said acquiring unit is obtained is divided into the first frame group video data and the second frame group video data by the difference that said video data belongs to frame;
H.264 or the MPEG of dynamic image expert group the first mode coding module is used for first frame group video data first mode of carrying out that said minute frame module divided is encoded, and said first mode is for;
The first mode decoder module is used for that the first frame group video data behind the said first mode coding module coding is carried out said first mode and decodes;
The first wavelet transformation module is used for the second frame group video data of frame module division in said minute and the difference of the decoded first frame group video data of the said first mode decoder module are carried out wavelet transformation;
First quantization modules is used for the video data behind the said first wavelet transformation module wavelet transformation is carried out lattice vector quantization;
The second mode coding module is used for video data second mode of carrying out behind the said first quantization modules lattice vector quantization is encoded, and said second mode is low density parity check code LDPC;
Said first transmitting element specifically is used for:
Send the first frame group video data after the said first mode coding module is encoded through wireless channel; With
Send the video data after the said second mode coding module is encoded through wireless channel.
13. terminal according to claim 12 is characterized in that,
Said distributed coding unit also comprises the arithmetic coding module, and the quantization index information that is produced when being used for that the video data behind the said wavelet transformation carried out lattice vector quantization is carried out arithmetic coding;
Said first transmitting element also is used for sending the quantization index information behind the said arithmetic coding module arithmetic coding through wireless channel.
14. terminal according to claim 12 is characterized in that,
Said first quantization modules specifically is used for:
Respectively the video data behind the said first wavelet transformation module wavelet transformation is carried out first lattice vector quantization and second lattice vector quantization; The precision of said first lattice vector quantization is higher than the precision of said second lattice vector quantization;
Export the poor of quantized value and the quantized value behind said second lattice vector quantization behind said first lattice vector quantization;
The said second mode coding module specifically is used for:
The quantized value behind said first lattice vector quantization of said first quantization modules output and difference second mode of carrying out of the quantized value behind said second lattice vector quantization are encoded.
15. according to each described terminal of claim 12 to 14, it is characterized in that,
The first frame group video data of frame module division in said minute is an odd-numbered frame group video data, and the second frame group video data of frame module division in said minute is an even frame group video data; Perhaps
The first frame group video data of frame module division in said minute is an even frame group video data, and the second frame group video data of frame module division in said minute is an odd-numbered frame group video data.
16. a wireless video transmission terminal is characterized in that, comprising:
Receiving element is used for receiving the video data that uses the distributed coding mode to encode through wireless channel;
Distributed decoding unit is used for the video data that said receiving element receives is carried out distributed decoding;
Second transmitting element is used to send the video data after the said distributed decoding unit decodes.
17. terminal according to claim 16 is characterized in that,
Said receiving element specifically is used for:
The first frame group video data after receiving first mode and encode through wireless channel, H.264 or the MPEG of dynamic image expert group said first mode is for; With
Receive the video data after said second mode is encoded through wireless channel, said second mode is LDPC;
Said distributed decoding unit comprises:
The first mode decoder module, the first frame group video data after being used for first mode said reception, said encoded carries out said first mode and decodes;
The second wavelet transformation module is used for the decoded first frame group video data of the said first mode decoder module is carried out wavelet transformation;
Second quantization modules is used for the first frame group video data behind the said second wavelet transformation module wavelet transformation is carried out lattice vector quantization;
The second mode decoder module, be used for said receiving element is received, the video data of said second mode after encoding carry out said second mode and decode;
Summation module is used to obtain the quantized value sum behind said decoded video data of the second mode decoder module and the said second quantization modules lattice vector quantization;
Inverse quantization module, said decoded video data of the second mode decoder module that is used for said summation module is obtained and the quantized value sum behind the said second quantization modules lattice vector quantization are carried out inverse quantization;
The wavelet inverse transformation module is used for the video data behind the said inverse quantization module inverse quantization is carried out wavelet inverse transformation, to obtain the second frame group video data;
Said second transmitting element specifically is used for:
Send the second frame group video data behind the said wavelet inverse transformation module wavelet inverse transformation; With
Send the decoded first frame group video data of the said first mode decoder module.
18. terminal according to claim 17 is characterized in that,
Said receiving element also is used for:
Receive the quantization index information behind the said arithmetic coding through wireless channel;
Said second quantization modules specifically is used for:
According to the quantization index information that said receiving element receives, the first frame group video data behind the said second wavelet transformation module wavelet transformation is carried out lattice vector quantization.
19. terminal according to claim 17 is characterized in that,
Said distributed decoding unit also comprises:
Reconstructed module is used for according to the first frame group video data behind the said second wavelet transformation module wavelet transformation video data behind the said inverse quantization module inverse quantization being carried out reconstruct;
Said wavelet inverse transformation module specifically is used for:
Video data to after the said reconstructed module reconstruct carries out wavelet inverse transformation, to obtain the second frame group video data.
20. according to the described terminal of claim 17 to 19, it is characterized in that,
The first frame group video data that said receiving element receives is an odd-numbered frame group video data, and the second frame group video data that said wavelet inverse transformation module obtains is an even frame group video data; Perhaps
The first frame group video data that said receiving element receives is an even frame group video data, and the second frame group video data that said wavelet inverse transformation module obtains is an odd-numbered frame group video data.
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