CN101394556A - Image transmission method, sending device and receiving device for deep space communication - Google Patents
Image transmission method, sending device and receiving device for deep space communication Download PDFInfo
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Abstract
The invention provides an image transmission method used for deep space communication, a transmitter installation and a receiving device, wherein, the image transmission method comprises the following steps: discrete wavelet transform is adopted to divide obtained digital images into a plurality of sub-bands with different important degrees, each sub-band is divided into a plurality of independent image blocks, and the image blocks are processed through entropy coding; repeat-accumulate codes are adopted on the sub-bands for channel coding and transmission according to the important degrees of the sub-bands; and a receiving terminal determines a request-retransmission image block according to the degree of importance of the data of an error image block in the received sub-band data and sends feedback information including the request-retransmission image block. The image transmission method, the transmitter installation and the receiving device adopt a wavelet transform method to utilize different transmission strategies on the sub-bands at different degrees of importance, and judge whether retransmission is needed according to the degree of importance of the lost data block, thereby reducing the times of retransmission operation and enhancing the fault-tolerance property of the image transmission for the deep space communication.
Description
Technical field
The present invention relates to the deep space communication technical field, specifically, relate to a kind of image transfer method, dispensing device, receiving system that is used for deep space communication.
Background technology
The survey of deep space technology has embodied a concentrated reflection of the development in science and technology level and the overall national strength of a country, has very strong scientific meaning and economic implications.Image is the expression forms of information the most intuitively that survey of deep space can access, and therefore, in the survey of deep space technology, effective transmission of image information is very important.
In image transmission technology such as ground communication networks such as Internet, when transmitting terminal carries out image compression, often can not be limited by the constraint of interchannel noise, this be because: if since the influence of interchannel noise caused image transmit in certain garble, and this garble causes the breaking-up of big picture possibly, even in this case, for the communication network that common commercial is used, only just can deal with problems by simple re-transmission of transmitting terminal.
, the deep space communication system compares with the communication system that above-mentioned common commercial is used, and has following shortcoming:
1, the channel of deep space communication is asymmetric, and the speed of the information of transmission information and reception is asymmetric;
2, the information time delay can reach the order of magnitude of dozens of minutes even a few hours, and the duration of communication may be less than signal propagation time;
3, information very easily makes a mistake in transmission course;
4, in the communication, handshake procedure efficient is low, confirms that retransmission efficiency is low.
Therefore, in the deep space communication system, carry out the image transmission, can not as carrying out the image transmission in the ground communication network, avoid because the problem that the big picture that interchannel noise causes damages by a large amount of retransmission operation.That is to say that in deep space communication, if adopt as the method for compressing image in the ground communication, if certain mistake takes place in communication, re-transmission can not be carried out smoothly, might cause the failure of image transmission.
In view of this, need the urgent technical problem that solves of those skilled in the art to be exactly: to seek the method for compressing image in the deep space communication, and reduce the retransmission operation in the image transmission course, thereby improve the fault-tolerance of deep space communication image transmission.
Summary of the invention
Technical problem to be solved by this invention is: the image transfer method in a kind of deep space communication is provided, and reduces the retransmission operation in the image transmission course, thereby improve the fault-tolerance of deep space communication image transfer method.
In order to address the above problem, the invention discloses a kind of image transfer method that is used for deep space communication, after transmitting terminal listens to the image transmission request of receiving terminal, send view data as follows: adopt wavelet transform, the digital picture of obtaining is divided into the different subband of a plurality of significance levels; With a plurality of independently image blocks of a sub-band division, and described image block carried out entropy coding; According to the significance level of described subband, described subband employing is repeated the accumulation sign indicating number carry out chnnel coding, wherein, during chnnel coding, the significance level of subband is high more, and the number of times that image block interweaves in the described subband is many more; Send the subband data after the described chnnel coding; Described receiving terminal is according in the subband data that is received, and the significance level of error image blocks of data is determined the request retransmission image block, and will include the feedback information transmission of described request retransmitting images piece.
Preferably, described method also comprises: transmitting terminal receives described feedback information, and according to described feedback information the request retransmission data block is resend.
Preferably, described image block is provided with location index, and described location index comprises subband index and the region index of image block in this subband, and the significance level of described image block is determined by the significance level of affiliated subband.
Preferably, determine the request retransmission image block, and will comprise that the feedback information transmission of all request retransmission image blocks comprises the steps: according to described location index image block and error image blocks of data that statistics receives; According to the significance level of described error image blocks of data, obtain the request retransmission data; The feedback information that includes the described request data retransmission is sent.
Preferably, adopt wavelet transform, the digital picture of obtaining is divided into four subbands that significance level is different by sphere of movements for the elephants shape, and, a subband is pressed sphere of movements for the elephants divide four independently image blocks.
According to embodiments of the invention, the present invention also provides a kind of picture transmitter device that is used for deep space communication, comprising: image transmission request monitoring module, wavelet transform module, entropy coding module, channel coding module and sending module.
Wherein, image transmission request monitoring module is used for the image transmission request of monitoring reception end; The wavelet transform module is used to adopt wavelet transform, and the digital picture of obtaining is divided into the different subband of a plurality of significance levels; The entropy coding module is used for a plurality of independently image blocks of described each sub-band division, and described image block is carried out entropy coding; Channel coding module is used for the significance level according to described subband, described subband employing is repeated the accumulation sign indicating number carry out chnnel coding; During chnnel coding, the significance level of subband is high more, and the number of times that image block interweaves in the described subband is many more; Sending module is used to send the subband data after the described chnnel coding.
Preferably, described image received device also comprises the feedback information receiver module, is used to receive the feedback information that described receiving terminal sends, and according to described feedback information the request retransmission data block is resend.
According to embodiments of the invention, the present invention also provides a kind of image received device that is used for deep space communication, comprising: image transmission request sending module, receiver module, feedback information sending module, channel decoding module, entropy decoder module and discrete wavelet inverse transform block.
Wherein, image transmission request sending module is used to send image transmission request; Receiver module is used to receive a plurality of subband datas of described transmitting terminal coding; Described subband obtains by the wavelet transform to view data, and described subband has corresponding significance level parameter; Described image block is by obtaining this sub-band division; The feedback information sending module is used for according to a plurality of subband datas that receive, and the significance level of error image piece is determined request retransmission image block and transmission; Channel decoding module is used for a plurality of subband datas of described coding are carried out channel-decoding; The entropy decoder module is used for the subband data of channel-decoding is carried out the entropy decoding, obtains described a plurality of independently image block, and described a plurality of independently image blocks are carried out image reorganization, to obtain the subband that described wavelet transform is divided; The discrete wavelet inverse transform block is used for the subband that decoding obtains to entropy and carries out the discrete wavelet inverse transformation, obtains decoded image data.
Preferably, described image block is provided with location index, and described location index comprises subband index and the region index of image block in this subband, and the significance level of described error image piece is determined by the significance level of affiliated subband.
Preferably, described feedback information sending module comprises: misdata statistics submodule, request retransmission data are obtained submodule, are sent submodule.
Wherein, misdata statistics submodule is used for according to described location index image block and error image blocks of data that statistics receives; The request retransmission data are obtained submodule and are used for significance level according to described error image piece, obtain the request retransmission data; Send the feedback information transmission that submodule is used for including the described request data retransmission.
Compared with prior art, the present invention has the following advantages: the present invention takes the Wavelet image coding that view data is divided into the different subband of significance level, helps adopting in the image transmission course different transmission policys; Segment the image into nonoverlapping zone at wavelet transformed domain, carry out entropy coding, can independently decode, and when some image area loss of data, can not produce too much influence picture quality at each image area of receiving terminal; Improved the fault-tolerance of deep space communication image transfer method.And, after the image transmission is finished, feed back according to the significance level of error data, avoid transmitting terminal to retransmit repeatedly and cause the channel problem that over-burden.
Description of drawings
Fig. 1 is the flow chart of the image transfer method embodiment of the deep space communication according to the present invention;
Fig. 2 is in the transmission method according to Fig. 1, the forwarding step flow chart of transmitting terminal;
Fig. 3 is in the transmission method according to Fig. 1, the receiving step flow chart of receiving terminal;
Fig. 4 is the structural representation of the picture transmitter device of deep space communication according to the present invention;
Fig. 5 is the structural representation of the image received device of deep space communication according to the present invention;
Fig. 6 is in the image received device of Fig. 5, the structural representation of feedback information sending module embodiment.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1, show the flow chart of the image transfer method embodiment of deep space communication of the present invention, transmitting terminal sends view data as follows and comprises following steps after listening to the image transmission request of receiving terminal:
Step 101: adopt wavelet transform, the digital picture of obtaining is divided into the different subband of a plurality of significance levels.
Wherein, in one embodiment, digital picture can be divided into four subbands behind wavelet transformation, be respectively upper left corner subband, upper right corner subband, lower left corner subband, lower right corner subband; The subband significance level that is positioned at the upper left corner is the highest, and the significance level of lower right corner subband is minimum.
Step 102:, and image block carried out entropy coding with a plurality of independently image blocks of a sub-band division.
In the specific implementation, each subband can be divided into four image blocks by sphere of movements for the elephants shape, each image block is encoded with different context models and entropy coder, be provided with location index at each image block, location index comprises subband index and the region index of image block in this subband, the independence during with the assurance decoding.
Step 103: according to the significance level of subband, the antithetical phrase band carries out chnnel coding.
In the specific implementation, (Repeat Accumulate RA) has simpler coding structure fast, therefore can be used as preferred coded system owing to repeat accumulated code.During coding, the significance level of subband is high more, and the interleaving degress when image block is encoded in the subband is many more.For example, can carry out three times to the data in the subband of the upper left corner and interweave, the data of its bottom right subband are once interweaved.
Step 104: the subband data behind the transmitting channel coding.
Step 105: receiving terminal according to the significance level of error image blocks of data, is determined the request retransmission image block according in the subband data that is received, and the feedback information that will include the request retransmission image block is sent to receiving terminal.
Wherein, the significance level of error image piece is determined by the significance level of affiliated subband.
With reference to Fig. 2, show in the transmission method according to Fig. 1, the forwarding step flow chart of transmitting terminal comprises the steps:
Step 201: transmitting terminal is waited for the request of data of receiving terminal;
Step 202: judge whether to listen to the request of data information that receiving terminal sends, and be judged as under the situation that is, execution in step 203, otherwise continue execution in step 201;
Step 203: adopting wavelet transformation, is the different subbands of a plurality of significance levels with the image division of obtaining;
Step 204: with each sub-band division is a plurality of independently image blocks, and each image block is carried out entropy coding, chnnel coding, and the subband of coding is sent;
Step 205: judged whether to receive the information of the request retransmission of transmitting terminal transmission, be judged as under the situation that is execution in step 206;
Step 206: transmitting terminal retransmits corresponding data.
With reference to Fig. 2, show in the transmission method according to Fig. 1, the receiving step flow chart of receiving terminal comprises the steps:
Step 301: send request of data to transmitting terminal.
Step 302: receive and add up the view data that transmitting terminal sends.
Step 303: the data according to statistics judge whether the view data that needs retransmit; In judged result is under the situation that is, execution in step 304 is under the situation not in judged result, execution in step 306.
Wherein, needing the data of re-transmission is to determine like this:
According to described location index, image block and error image blocks of data that statistics receives;
According to the significance level of described error image piece, obtain the request retransmission data.
Step 304: send the request that needs data retransmission to transmitting terminal.
Step 305: receive come from transmitting terminal data retransmission.
Step 306: the data that receive are carried out channel-decoding, entropy decoding, image reorganization, wavelet transform, thereby obtain the image of decoding.In addition, receiving terminal can be according to error correcting code to can data recovered recovering when decoding.
With reference to Fig. 4, show the structural representation of the picture transmitter device of deep space communication according to the present invention, the structure of this dispensing device comprises:
Image transmission request monitoring module 401 is used for the image transmission request of monitoring reception end;
Sending module 405 is used for the subband data after transmitting channel is encoded.
Feedback information receiver module 406 is used for the feedback information that receiving end/sending end sends, and according to feedback information the request retransmission data block is resend.
Preferably, digital picture is divided into four subband by sphere of movements for the elephants shape, and each subband is divided into four independent image pieces by sphere of movements for the elephants shape, determines the significance level of each subband according to the position of subband, the subband significance level that is positioned at the upper left corner is the highest, and the significance level of lower right corner subband is minimum.
With reference to Fig. 5, show the structural representation of the image received device of deep space communication according to the present invention, the structure of this receiving system comprises:
Image transmission request sending module 501 is used to send image transmission request;
Receiver module 502 is used for a plurality of subband datas that receiving end/sending end is encoded; Subband obtains by the wavelet transform to view data, and subband has corresponding significance level parameter; The significance level of subband is high more, and the number of times that image block interweaves in the subband when chnnel coding is many more; Image block is by obtaining this sub-band division;
Feedback information sending module 503 is used for according to a plurality of subband datas that receive, and the significance level of error image blocks of data is determined request retransmission image block and transmission;
Channel decoding module 504 is used for a plurality of subband datas of coding are carried out channel-decoding;
Entropy decoder module 505 is used for the subband data of channel-decoding is carried out the entropy decoding, obtains a plurality of independently image blocks, and a plurality of independently image blocks are carried out image reorganization, to obtain the subband that wavelet transform is divided;
Discrete wavelet inverse transform block 506 is used for the subband that decoding obtains to entropy and carries out the discrete wavelet inverse transformation, obtains decoded image data.
Further, image block is provided with location index, and location index comprises subband index and the region index of image block in this subband, and the significance level of error image piece is by the significance level decision of affiliated subband.
With reference to Fig. 6, show in the image received device of Fig. 5, the structural representation of feedback information sending module embodiment comprises following structure:
Misdata statistics submodule 601, according to described location index, image block and error image blocks of data that statistics receives;
The request retransmission data are obtained submodule 602, are used for the significance level according to the error image piece, obtain the request retransmission data;
Send submodule 603, the feedback information that is used for including the request retransmission data sends.
To sum up, in the present invention:
The present invention takes the Wavelet image coding that view data is divided into the different subband of significance level, helps adopting in the image transmission course different transmission policys; Segment the image into nonoverlapping zone at wavelet transformed domain, carry out entropy coding, can independently decode, and when some image area loss of data, can not produce too much influence picture quality at each image area of receiving terminal; Improved the fault-tolerance of deep space communication image transfer method.After the image transmission is finished, feed back, avoid transmitting terminal to retransmit repeatedly and cause the channel problem that over-burden according to the significance level of error data.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For system embodiment, because it is similar substantially to method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
More than to image transfer method, dispensing device, the receiving system of a kind of deep space communication provided by the present invention, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1, a kind of image transfer method that is used for deep space communication is characterized in that, transmitting terminal sends view data after listening to the image transmission request of receiving terminal as follows:
Adopt wavelet transform, the digital picture of obtaining is divided into the different subband of a plurality of significance levels;
With a plurality of independently image blocks of a sub-band division, and described image block carried out entropy coding;
According to the significance level of described subband, described subband employing is repeated the accumulation sign indicating number carry out chnnel coding, wherein, during chnnel coding, the significance level of subband is high more, and the number of times that image block interweaves in the described subband is many more;
Send the subband data after the described chnnel coding;
Described receiving terminal is according in the subband data that is received, and the significance level of error image blocks of data is determined the request retransmission image block, and will include the feedback information transmission of described request retransmitting images piece.
2, image transfer method according to claim 1 is characterized in that, described method also comprises: transmitting terminal receives described feedback information, and according to described feedback information the request retransmission data block is resend.
3, image transfer method according to claim 2, it is characterized in that described image block is provided with location index, described location index comprises subband index and the region index of image block in this subband, and the significance level of described image block is determined by the significance level of affiliated subband.
4, image transfer method according to claim 3 is characterized in that, determines the request retransmission image block, and will comprise that the feedback information transmission of all request retransmission image blocks comprises the steps:
According to described location index, image block and error image blocks of data that statistics receives;
According to the significance level of described error image blocks of data, obtain the request retransmission data;
The feedback information that includes the described request data retransmission is sent.
5, image transfer method according to claim 4, it is characterized in that, adopt wavelet transform, the digital picture of obtaining is divided into four subbands that significance level is different by sphere of movements for the elephants shape, and, a subband is pressed sphere of movements for the elephants divides four independently image blocks.
6, a kind of picture transmitter device that is used for deep space communication is characterized in that, comprising:
Image transmission request monitoring module is used for the image transmission request of monitoring reception end;
The wavelet transform module is used to adopt wavelet transform, and the digital picture of obtaining is divided into the different subband of a plurality of significance levels;
The entropy coding module is used for a plurality of independently image blocks of described each sub-band division, and described image block is carried out entropy coding;
Channel coding module is used for the significance level according to described subband, described subband employing is repeated the accumulation sign indicating number carry out chnnel coding; Wherein, during chnnel coding, the significance level of subband is high more, and the number of times that image block interweaves in the described subband is many more;
Sending module is used to send the subband data after the described chnnel coding.
7, the picture transmitter device that is used for deep space communication according to claim 6, it is characterized in that, described image received device also comprises the feedback information receiver module, is used to receive the feedback information that described receiving terminal sends, and according to described feedback information the request retransmission data block is resend.
8, a kind of image received device that is used for deep space communication is characterized in that, comprising:
Image transmission request sending module is used to send image transmission request;
Receiver module is used to receive a plurality of subband datas that described transmitting terminal is encoded; Described subband obtains by the wavelet transform to view data, and described subband has corresponding significance level parameter; Described image block is by obtaining this sub-band division;
The feedback information sending module is used for according to a plurality of subband datas that receive, and the significance level of error image piece is determined request retransmission image block and transmission;
Channel decoding module is used for a plurality of subband datas of described coding are carried out channel-decoding;
The entropy decoder module is used for the subband data of channel-decoding is carried out the entropy decoding, obtains described a plurality of independently image block, and described a plurality of independently image blocks are carried out image reorganization, to obtain the subband that described wavelet transform is divided;
The discrete wavelet inverse transform block is used for the subband that decoding obtains to entropy and carries out the discrete wavelet inverse transformation, obtains decoded image data.
9, the image received device that is used for deep space communication according to claim 8, it is characterized in that, described image block is provided with location index, described location index comprises subband index and the region index of image block in this subband, and the significance level of described error image piece is determined by the significance level of affiliated subband.
10, the image received device that is used for deep space communication according to claim 9 is characterized in that, described feedback information sending module comprises:
Misdata statistics submodule is used for according to described location index image block and error image blocks of data that statistics receives;
The request retransmission data are obtained submodule, are used for the significance level according to described error image piece, obtain the request retransmission data;
Send submodule, the feedback information that is used for including the described request data retransmission sends.
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| CN102316360A (en) * | 2010-07-09 | 2012-01-11 | 华为终端有限公司 | Video refreshing method, device and system |
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| CN102438142A (en) * | 2011-11-08 | 2012-05-02 | 北京空间机电研究所 | Adaptive image compression method based on deep space background |
| CN105050175A (en) * | 2015-06-09 | 2015-11-11 | 哈尔滨工业大学 | Deep-space transmission link wavelet weak-signal extraction apparatus and method |
| CN111262660A (en) * | 2018-11-30 | 2020-06-09 | 华为技术有限公司 | Data transmission method, equipment and system |
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