WO2015101280A1 - Procédé et système d'attribution de rendement de codage de canal - Google Patents

Procédé et système d'attribution de rendement de codage de canal Download PDF

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WO2015101280A1
WO2015101280A1 PCT/CN2014/095524 CN2014095524W WO2015101280A1 WO 2015101280 A1 WO2015101280 A1 WO 2015101280A1 CN 2014095524 W CN2014095524 W CN 2014095524W WO 2015101280 A1 WO2015101280 A1 WO 2015101280A1
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channel coding
channel
rate
code stream
optimal
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PCT/CN2014/095524
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Chinese (zh)
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陈俊宏
申风平
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深圳市大富科技股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

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  • the present invention relates to the field of communications technologies, and in particular, to a channel rate allocation method and system for a channel.
  • the image transmission system is the same as the general communication system, and the source image is also encoded by the source code and channel coded, and then modulated and transmitted.
  • the value of the rate R T is qualitatively examined for the distortion D of the reconstructed image by adjusting R s .
  • this technical problem can be abstracted as a minimization problem for solving the following formula (1):
  • ⁇ represents a channel coding rate allocation strategy
  • B is a highest transmission rate under the transmission bandwidth limitation of the image transmission system
  • the transmission rate of the image transmission system when the strategy ⁇ is allocated using the channel coding rate
  • N is the number of source coded stream packets when the image transmission system transmits
  • D(i) the image decoder decodes the first i packets The distortion of the reconstructed image obtained afterwards
  • q(i, ⁇ ) is the probability that the first i packets can be correctly decoded, and the i+1th packet cannot be correctly decoded.
  • D(i) is very complicated.
  • the current common solution is to simplify D(i), which is to simplify D(i) of all images into a linear function.
  • the optimal criterion in the formula (1) is converted into the criterion described in the following formula (2):
  • E N ( ⁇ ) refers to the mathematical expectation that the number of information bits can be correctly received using the channel coding rate allocation strategy ⁇ ; V(i) is the number of information bits included in the first i packets; q(i, ⁇ ) is still the probability that the ith packet can be received correctly, and the i+1th packet cannot be received correctly.
  • Stankovic V. et al. use the relationship of the importance level of the embedded code stream to deduct the relationship.
  • the optimal rate rate allocation is also the nature of descending order, and the calculation of each source coded output stream grouping. In the optimal channel coding, the calculation time of the allocation algorithm is reduced by calculating the number of code stream packets using the same channel coding.
  • the technical problem to be solved by the present invention is to provide a channel rate allocation method and system, which can reduce the code rate allocation time and improve the image transmission quality.
  • an aspect of the present invention is to provide a channel rate allocation method for a source channel joint coding transmission system, wherein the source code is an embedded source code and its rate is distorted.
  • the function is a convex function, and the method comprises: determining a maximum value r up that can be achieved by a channel coding rate of the source coded code stream according to a convex function of the rate distortion function of the embedded source code; The maximum value r up and the first channel coding set R 1 are determined, and the second channel coding set R 2 is determined , wherein the first channel coding set R 1 is a set of channel coding bit rate components of the channel coding, and the second channel coding Set R 2 is a subset of the first channel coding set R 1 ; determining a first optimal code rate allocation strategy for the channel of the source coded code stream in the second channel coding set R 2 ; assigning according to the first optimal code rate The strategy performs channel rate allocation on the source coded code stream.
  • the step of performing channel coding protection on the number of source coded code stream packets t i And then outputting a second optimal code rate allocation strategy of the channel of the source coded code stream, and the second optimal code rate allocation strategy is:
  • the first optimal code rate allocation strategy is:
  • the step of determining the maximum value r up that can be achieved by the channel coding rate of the source coded code stream according to the convex function of the rate distortion function of the embedded source code includes: following the multi-level tree set splitting algorithm SPIHT And encoding the transmitted image to obtain a source coded code stream; grouping the source coded code streams according to different importance of the source coded code stream, wherein the importance of the source coded code stream is used to indicate at the receiving end The amount of contribution of the source coded stream to image distortion when reconstructing the image.
  • the method further includes: adding a check code at the end of the grouped source coded code stream; and according to the channel code rate allocated by the source coded code stream, the source coded code stream of the group added with the check code
  • the rate is compatible with the perforated Turbo code RCPT channel coding; the source coded code stream that has been subjected to the RCPT channel coding is modulated and transmitted.
  • a channel rate allocation system which is a source channel joint coding transmission system, in which a source code is an embedded source code and its rate is distorted.
  • function is a convex function
  • the system comprising: a first determining module, according convex function of the embedded source coding rate distortion function, determining a channel coding rate of the source encoded stream can reach a maximum value r up a second determining module, configured to determine a second channel coding set R2 by using a maximum value r up and a first channel coding set R1 that can be achieved by a channel coding rate, where the first channel coding set R1 is a channel coded channel a set of coded rate components, the second channel code set R2 is a subset of the first channel code set R1; and a third determining module is configured to determine, in the second channel code set R2, the first channel of the source coded code stream An optimal rate allocation strategy; an allocation module, configured to perform channel rate
  • the first optimal code rate allocation strategy is:
  • the system further includes: a source coding module, configured to encode the image to be transmitted according to the multi-level tree set splitting algorithm SPIHT, to obtain a source coded code stream; and a grouping module for encoding the code stream according to the importance of the source code Differently, the source coded code streams are grouped, wherein the importance of the source coded code stream is used to indicate the contribution of the source coded code stream to the image distortion when the image is reconstructed at the receiving end.
  • a source coding module configured to encode the image to be transmitted according to the multi-level tree set splitting algorithm SPIHT, to obtain a source coded code stream
  • a grouping module for encoding the code stream according to the importance of the source code Differently, the source coded code streams are grouped, wherein the importance of the source coded code stream is used to indicate the contribution of the source coded code stream to the image distortion when the image is reconstructed at the receiving end.
  • the system further includes: a check code adding module, configured to add a check code at the end of the grouped source coded code stream; and a channel coding module configured to use the channel code rate that has been allocated according to the source coded code stream And performing rate-compatible punctured Turbo code RCPT channel coding on the source coded code stream of the packet added with the check code; and modulating and transmitting the module, configured to modulate and transmit the source coded code stream that has undergone RCPT channel coding.
  • a check code adding module configured to add a check code at the end of the grouped source coded code stream
  • a channel coding module configured to use the channel code rate that has been allocated according to the source coded code stream And performing rate-compatible punctured Turbo code RCPT channel coding on the source coded code stream of the packet added with the check code
  • modulating and transmitting the module configured to modulate and transmit the source coded code stream that has undergone RCPT channel coding.
  • the code rate allocation method of the channel of the present invention determines the channel coding rate of the source coded code stream according to the convex function of the rate distortion function of the embedded source code. r up the maximum attainable; the channel encoding rate r up maximum achievable channel coding and a first set of R 1, determining a second set of channel coding R 2; determining a second channel in the channel coding set R 2 a first optimal code rate allocation strategy of the channel of the source coded code stream; and performing rate allocation of the channel to the source coded code stream according to the first optimal code rate allocation strategy.
  • Determining the first optimal code rate allocation strategy by determining R 2 in the subset of R 1 can reduce the code rate allocation time; further determining the r up according to the convex function of the rate distortion function of the embedded source coding, and implementing the function using the convexity
  • the form approximates the rate distortion, and the rate distortion estimation of the source code is more accurate, thereby improving the image transmission quality.
  • FIG. 1 is a schematic diagram of an R-D curve in a first embodiment of a code rate allocation method for a channel according to the present invention
  • FIG. 2 is a flowchart of a first embodiment of a code rate allocation method for a channel according to the present invention
  • FIG. 3 is a flowchart of a first optimal code rate allocation strategy for determining a channel of a source coded code stream in a second channel coding set in the first embodiment of the channel rate allocation method of the present invention
  • FIG. 4 is a flowchart of a second embodiment of a code rate allocation method for a channel according to the present invention.
  • FIG. 5 is a second embodiment of a code rate allocation method for a channel of the present invention, in which an experimental image Lena is in a BSC channel. PSNR after transmission;
  • FIG. 6 is a schematic block diagram of an embodiment of a rate allocation system for a channel of the present invention.
  • FIG. 7 is a schematic block diagram of a third determining module in an implementation manner of a rate allocation system for a channel according to the present invention.
  • FIG. 8 is a schematic block diagram of a second determining unit in an embodiment of a rate allocation system for a channel of the present invention.
  • R n ' ⁇ wherein R 1' ⁇ ... ⁇ R n ', and any length encoder generates R i' is the length of the code stream R j 'prefix code stream, where 1 ⁇ i ⁇ j ⁇ n, the image encoder is an embedded image encoder, and the corresponding code stream is an embedded image coded stream.
  • the rate distortion function is specifically a convex function, and the rate distortion function represents the relationship between the distortion of the embedded image coded stream and the code rate, and the relationship satisfies the rate distortion theory.
  • the bit rate is the bit rate.
  • the code rate in video and image refers to the sampling rate of sound and image converted from analog signal to digital signal. The higher the sampling rate, the better the restored sound quality and image, so the image distortion D s will As the image compression coding rate R s increases, the RD curve of the convex function is specifically as shown in FIG. 1 .
  • a first embodiment of a method for allocating a rate of a channel according to the present invention includes:
  • Step S11 Determine a maximum value that can be achieved by the channel coding rate of the source coded code stream according to the convex function of the rate distortion function of the embedded source code.
  • the digital signal In the transmission, the digital signal often causes errors in the transmitted data stream for various reasons, so that the image is skipped, discontinuous, and mosaic occurs at the receiving end. Therefore, the code stream is performed through the channel coding. Corresponding processing makes the system have certain error correction capability and anti-interference ability, which can greatly avoid the occurrence of bit errors in the code stream transmission. Improving data transmission efficiency and reducing bit error rate are tasks of channel coding.
  • the essence of channel coding is to increase the reliability of communication, but channel coding can reduce the transmission of useful information data.
  • the process of channel coding is to insert some symbols into the original code stream to achieve error diagnosis and error correction at the receiving end. purpose. In a channel with a fixed bandwidth, the total transmission code rate is also fixed.
  • the channel coding increases the amount of data, the result can only be at the cost of reducing the rate at which the useful information is transmitted.
  • the number of useful bits is divided by the total number of bits. Letter
  • the channel coding rate, different coding modes, and the channel coding rate are different. The higher the channel coding rate, the more useful information bits are transmitted, but the lower the system's ability to judge and correct errors, the lower the channel coding rate, the less useful information bits are transmitted, but the system's error is judged. And the ability to correct errors. For most image encoders, the sensitivity of the different parts of the encoded code stream to noise is different. If the same strength channel coding protection is used for the entire source coded code stream, bandwidth is wasted.
  • the method further includes determining the importance of the source coded code stream, and encoding the source code according to the importance of the source coded code stream.
  • the stream is grouped to obtain code stream packets of different importance, wherein the importance of the source coded code stream is used to indicate the amount of contribution of the source coded code stream to image distortion when reconstructing the image at the receiving end.
  • the maximum value r up that can be achieved by the channel coding rate of the source coded code stream is determined.
  • the channel coding rate corresponding to the packet is less than or equal to r up .
  • the maximum value that can be achieved by the channel coding rate of the source coded stream is Give specific instructions:
  • D i is a distortion of the reconstructed image after decoding using i code stream packets
  • the optimal channel coding rate of the Nth code stream packet is:
  • the error protection of the last stream packet is reduced.
  • the last stream packet is of the least importance.
  • the last stream packet have two possible channel coding rate, ie
  • Step S12 Determine a second channel coding set by using a maximum value that can be achieved by the channel coding rate and the first channel coding set.
  • Step S13 Determine a first optimal code rate allocation strategy of the channel of the source coded code stream in the second channel coding set.
  • the step of determining a first optimal rate allocation policy for a channel of a source coded code stream in the second channel code set R 2 specifically includes:
  • Sub-step S131 Calculating the optimal channel coding rate of the source coded code stream at the time of equal error protection.
  • Optimal channel coding rate of source coded code stream in Equal Error Protection (EEP) N is the number of source coded stream packets.
  • Sub-step S132 determining a third channel coding set and a fourth channel coding set according to the optimal channel coding rate and the second channel coding set of the source coded code stream at the time of equal error protection.
  • Sub-step S133 determining a second optimal code rate allocation strategy for the channel of the source coded code stream in the third channel coding set and the fourth channel coding set by using a rate-optimized fast algorithm of embedded coding error protection Three optimal rate allocation strategy.
  • the third set of R 3 channel coding determining channel source encoded stream of the second step of the optimal bit allocation strategy comprises:
  • calculation uses channel coding
  • the calculation formula of the number t i , t i of the source coded code stream packets for channel coding protection is as shown in formula (7):
  • E N ( ⁇ ) represents the mathematical expectation that the number of information bits can be correctly received using the allocation strategy ⁇
  • the step of determining the third optimal rate allocation policy of the channel of the source coded code stream in the fourth channel coding set R 4 by using the rate-optimized fast algorithm of the embedded coding error protection includes:
  • Sub-step S134 Combining the second optimal code rate allocation strategy and the third optimal code rate allocation strategy into a first optimal code rate allocation strategy.
  • the first optimal code rate allocation strategy ⁇ 1 is determined by performing the backward search process and the forward search process simultaneously; in other embodiments, r 1 may be the search start point and r up is the search end point in the set.
  • R 2 a first determined the optimal rate allocation strategy ⁇ 1, r up or to search start point and search end point r 1 is a first determined the optimal rate allocation policy in the set ⁇ 1 R 2, here without too much limit.
  • step S13 the channel of the source coded code stream is determined in the second channel coding set.
  • An optimal rate allocation strategy in addition to the rate-optimized fast algorithm using embedded coding error protection, other methods may be used to determine the first optimal code of the channel of the source coded code stream in the second channel coding set.
  • Rate allocation strategy for example: Nosratinia et al. use the method of parameter approximation to solve the optimal rate allocation problem by establishing an empirical model: this method mainly establishes an empirical model by using channel decoding error probability as a function of channel coding; In the memory channel, the model has a closed form expression; the optimal code rate allocation in the sense of the model can be obtained through the establishment of the model.
  • Step S14 Perform rate allocation of the channel on the source coded code stream according to the first optimal code rate allocation policy.
  • the first optimal code rate allocation strategy ⁇ 1 includes a channel coding code rate to be used by each packet of the source coded code stream, and further performs a channel code for the source coded code stream according to the first optimal code rate allocation strategy ⁇ 1 Rate allocation. For example, assigning a channel coding rate to t 1 code stream packets It is protected when t 1 code stream packets are transmitted on the channel.
  • the first embodiment of the channel rate allocation method of the channel of the present invention determines the maximum value r up that can be achieved by the channel coding rate of the source coded code stream according to the convex function of the rate distortion function of the embedded source code; Determining a second channel coding set R 2 by a maximum value r up that can be achieved by a channel coding rate and a first channel coding set R 1 ; determining a channel of the source coded code stream in the second channel coding set R 2 An optimal rate allocation strategy; performing rate allocation of the channel to the source coded code stream according to the first optimal code rate allocation strategy.
  • Determining the first optimal code rate allocation strategy by determining R 2 in the subset of R 1 can reduce the code rate allocation time; further determining the r up according to the convex function of the rate distortion function of the embedded source coding, and implementing the function using the convexity
  • the form approximates the rate distortion, and the rate distortion estimation of the source code is more accurate, thereby enabling the image transmission quality to be improved when the image rate distribution method of the present embodiment is used for image transmission.
  • a second embodiment of a method for allocating a rate of a channel according to the present invention includes:
  • Step S21 According to the multi-level tree set splitting algorithm SPIHT, the image to be transmitted is encoded to obtain a source coded code stream.
  • the total transmission code rate is first determined when the image is transmitted, and then the image to be transmitted is encoded according to a Set Partition In Hierarchical Trees (SPIHT) to obtain a source coded code stream.
  • SPIHT Set Partition In Hierarchical Trees
  • the SPIHT algorithm is a quantization coding algorithm based on wavelet transform.
  • the SPIHT algorithm is also the most representative embedded.
  • One of the input coding algorithms When a source image is encoded using the SPIHT algorithm, a code having a low code rate is a preamble of a code having a high code rate in a code stream of a different code rate generated by the encoder.
  • the code stream using the SPIHT algorithm for source coding can be truncated at any position lower than the source code rate, and a code stream with a lower code rate can be obtained, so that a poor quality can be reconstructed with the code stream.
  • Low bit rate image
  • Step S22 group the source coded code streams according to the importance of the source coded code stream.
  • the source coded code stream is grouped to obtain each code stream packet, and the importance of the source coded code stream is used to indicate the contribution of the source coded code stream to the image distortion when reconstructing the image at the receiving end, and the source coded code stream is The higher the importance, the greater its contribution to image distortion.
  • Step S23 adding a check code to the end of the grouped source coded code stream.
  • a check code is added at the end of each code stream packet, and specifically may be a 16-bit CRC check code.
  • Step S24 Determine a maximum value that can be achieved by the channel coding rate of the source coded code stream according to the convex function of the rate distortion function of the embedded source code.
  • Step S25 Determine a second channel coding set by using a maximum value that can be achieved by the channel coding rate and the first channel coding set.
  • Step S26 Determine a first optimal code rate allocation strategy of the channel of the source coded code stream in the second channel coding set.
  • this step includes:
  • the optimal channel coding rate r EEP of the source coded code stream at the time of equal error protection is calculated.
  • the third channel coding set R 3 and the fourth channel coding set R 4 are determined according to the optimal channel coding rate r EEP and the second channel coding set R 2 of the source coded code stream at the time of equal error protection.
  • determining a second optimal code rate allocation strategy and a channel of the channel of the source coded code stream in the third channel coding set R 3 and the fourth channel coding set R 4 respectively Three optimal rate allocation strategy.
  • the second optimal code rate allocation strategy and the third optimal code rate allocation strategy are combined into a first optimal code rate allocation strategy.
  • Step S27 Perform rate allocation of the channel on the source coded code stream according to the first optimal code rate allocation policy.
  • Step S28 Perform rate-compatible perforated Turbo code RCPT channel coding on the source coded code stream of the packet to which the check code is added according to the channel coding code rate that has been allocated by the source coded code stream.
  • Turbo code is a parallel cascaded channel coding, which can make its bit error rate resistance close to the Shannon limit through proper iteration during decoding.
  • the RCPT (Rate-Compatible Punctured Turbo) code first selects a Turbo code as the mother code, and then generates a set of channel coding code rates by Punctured on the basis of the mother code. The same but compatible channel coding.
  • the rate compatibility means that the group of channel codes derived from the mother code puncturing can be decoded by the decoder of the mother code.
  • the set of channel codes derived from the mother code and its perforations is called a set of RCPT codes.
  • a set of RCPT codes has the following properties: a set of RCPT codes can be determined by the mother code and its puncturing matrix; all channel codes in the RCPT code can be decoded using the decoder of the mother code; the channel coding rate of each subcode is not mutually The same, and both are smaller than the channel coding rate of the mother code; appropriately selecting the number of decoding iterations can make each subcode performance close to the respective Shannon limit, so the subcode with smaller channel coding code rate has better bit error rate performance.
  • Step S29 Modulating and transmitting the source coded code stream that has undergone RCPT channel coding.
  • the source coded code stream for performing RCPT channel coding is a data packet.
  • the receiving end After modulating the transmitted data packet, the receiving end first performs channel decoding on the demodulated signal to obtain a decoding result, and then performs CRC detection on the decoded result.
  • the decoding error of the RCPT code is detected, the remaining data packets are stopped, and the previously successfully translated data packet is used for SPIHT decoding, thereby reconstructing the source image.
  • the code rate allocation method of the channel of the present embodiment is applied to an image transmission system based on SPIHT+RCPT code. In other embodiments, it can also be applied to other image transmission systems such as JEPG2000+RCPC code, and is not limited herein.
  • the following describes an example in which the experimental image Lena is transmitted by the code rate allocation method of the channel of the present embodiment.
  • the experimental channel uses the BSC channel, and the total transmission rate is first determined when the image is transmitted.
  • the total transmission rate is set to 1.0 bpp and 0.5 bpp, respectively, for comparison.
  • the experimental image to be transmitted is then SPIHT encoded by a 512 ⁇ 512 pixel Lena image with a source code rate of 1.0 bpp.
  • the optimal rate allocation strategy is calculated for the above two transmission modes under several different channel conditions, and Table 2 is the code rate allocation method of the present invention under the same transmission condition. The number of iterations in the calculation of the rate allocation using the Stankovic algorithm.
  • the rate of the channel is allocated to the experimental image Lena of the size of 512 ⁇ 512 pixels by using the rate allocation method of the present invention.
  • the corresponding first optimal rate allocation strategy is shown in Table 3.
  • FIG. 5 shows the peak value of the experimental image Lena after image transmission using the first optimal code rate allocation strategy in the BSC channel with different error rates.
  • PSNR Signal to Noise Ration
  • PSNR is an objective standard for measuring image transmission quality. The higher the PSNR, the better the image transmission quality. The distortion-based result in Figure 5 can theoretically be achieved. The best result, and because of its high computational complexity, the calculation method cannot be applied to the actual transmission process.
  • the PSNR after image transmission using the Stankovic algorithm under the same transmission conditions is also shown in Fig. 5.
  • the PSNR corresponding to the image transmission using the first optimal code rate allocation strategy is compared with the Stankovic algorithm. The closer to the distortion-based result, the higher the image transmission quality.
  • the second embodiment of the channel rate allocation method of the channel of the present invention determines the maximum value r up that can be achieved by the channel coding rate of the source coded code stream according to the convex function of the rate distortion function of the embedded source code; Determining a second channel coding set R 2 by a maximum value r up that can be achieved by a channel coding rate and a first channel coding set R 1 ; determining a channel of the source coded code stream in the second channel coding set R 2 An optimal rate allocation strategy; according to the first optimal code rate allocation strategy, performing channel bit rate allocation on the source coded code stream; adding a check code according to the channel code rate assigned by the source coded code stream
  • the grouped source coded code stream is RCPT channel coded; the source coded code stream that has been subjected to RCPT channel coding is modulated and transmitted.
  • the code rate allocation time can be reduced by the above method; in addition, r up is determined according to the convex function of the rate distortion function of the embedded source coding, and the rate distortion is approximated by using the function form of the lower convex, and the rate distortion estimation of the source coding is performed. More accurate, there is a larger gain in the distortion of the reconstructed image, which improves the image transmission quality.
  • the invention also provides a channel rate allocation system, which is a source channel joint coding transmission system, wherein the source code is embedded source coded and the rate distortion function is a convex function.
  • an implementation manner of a rate allocation system for a channel of the present invention includes:
  • the first determining module 31 is configured to determine a maximum value r up that can be achieved by a channel coding rate of the source coded code stream according to a convex function of the rate distortion function of the embedded source code.
  • p i is encoded using the ith channel The probability of an error occurring while transmitting under the current channel.
  • the second determining module 32 is configured to determine a second channel coding set R2 by using a maximum value r up and a first channel coding set R1 that can be achieved by the channel coding rate, where the first channel coding set R1 is a channel coded channel.
  • a set of code rate components, the second channel code set R2 is a subset of the first channel code set R1.
  • the third determining module 33 is configured to determine, in the second channel coding set R2, a first optimal code rate allocation policy of the channel of the source coded code stream. Further, the third determining module includes:
  • the calculating unit 331 is configured to calculate an optimal equal error protection channel coding rate r EEP of the source coded code stream when the equalization error protection is performed, where N is the number of source coded stream packets.
  • the first determining unit 332 is configured to determine the third channel coding set R 3 and the fourth channel coding according to the optimal channel coding rate r EEP and the second channel coding set R 2 of the source coded code stream at the time of equal error protection.
  • the second determining unit 333 includes:
  • a first calculation subunit 3331 for calculating a channel coding used The number of source coded code stream packets subjected to channel coding protection, t i .
  • a first output subunit 3333 for And outputting a second optimal code rate allocation strategy of the channel of the source coded code stream, and the second optimal code rate allocation strategy is:
  • the second determining unit 333 further includes:
  • a third calculation subunit 3334 for calculating the use of channel coding The number of source coded code stream packets s u that are subjected to channel coding protection.
  • the merging unit 334 is configured to combine the second optimal rate allocation policy and the third optimal rate allocation policy into a first optimal rate allocation policy, where the first optimal rate allocation policy is:
  • the allocating module 34 is configured to perform rate allocation of the channel on the source coded code stream according to the first optimal code rate allocation policy.
  • the rate allocation system of the channel of the present invention further includes:
  • the source coding module is configured to encode the image to be transmitted according to the multi-level tree set splitting algorithm SPIHT to obtain a source coded code stream.
  • a grouping module configured to group the source coded code streams according to different importance of the source coded code stream, wherein the importance of the source coded code stream is used to indicate the source coded code stream pair when the image is reconstructed at the receiving end The amount of contribution of image distortion.
  • the check code is added to the module for adding a check code to the end of the grouped source coded code stream.
  • the channel coding module is configured to perform rate-compatible perforated Turbo code RCPT channel coding on the source coded code stream of the packet to which the check code is added according to the channel coding code rate that has been allocated by the source coded code stream.
  • the modulation sending module is configured to perform modulation transmission on the source coded code stream that has undergone RCPT channel coding.
  • the embodiment of the present invention determines the maximum value r up that can be achieved by the channel coding rate of the source coded code stream according to the convex function of the rate distortion function of the embedded source code; the channel code rate can be achieved by the channel coding rate.
  • the first optimal code rate allocation strategy performs channel rate allocation on the source coded code stream.
  • Determining the first optimal code rate allocation strategy by determining R 2 in the subset of R 1 can reduce the code rate allocation time; further determining the r up according to the convex function of the rate distortion function of the embedded source coding, and implementing the function using the convexity
  • the form approximates the rate distortion, and the rate distortion estimation of the source code is more accurate, thereby enabling the image transmission quality to be improved when the image rate distribution method of the present embodiment is used for image transmission.

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  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

L'invention concerne un procédé d'attribution de rendement de codage de canal. Le procédé est utilisé dans un système de transmission à codage source-canal combiné, dans lequel un codage de source est un codage de source intégré et sa fonction débit-distorsion est une fonction convexe. Le procédé consiste à: sur la base d'une fonction convexe caractéristique de la fonction débit-distorsion du codage de source intégré, déterminer une valeur maximale rup qui peut être atteinte par un rendement de codage de canal d'un flux de codage de source; au moyen de la valeur maximale rup qui peut être atteinte par le rendement de codage de canal et d'un premier ensemble de codages de canal R1, déterminer un second ensemble de codages de canal R2; déterminer une première politique d'attribution de rendement de codage optimal d'un canal du flux de codage de source dans le second ensemble de codages de canal R2; et sur la base de la première politique d'attribution de rendement de codage optimal, effectuer une attribution de rendement de codage de canal pour le flux de codage de source. Un système d'attribution de rendement de codage de canal est également décrit. De la manière précédente, la présente invention peut réduire le temps d'attribution de rendement de codage et améliorer la qualité de transmission d'image.
PCT/CN2014/095524 2013-12-31 2014-12-30 Procédé et système d'attribution de rendement de codage de canal WO2015101280A1 (fr)

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CN103716657B (zh) * 2013-12-31 2017-02-22 深圳市大富科技股份有限公司 一种信道的码率分配方法及系统
WO2016015250A1 (fr) * 2014-07-30 2016-02-04 深圳市大富科技股份有限公司 Procédé d'attribution de débit de code de canal, système, et système de transfert d'image à distance

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US5596602A (en) * 1995-03-24 1997-01-21 Eastman Kodak Company Data compression rate control method and apparatus
KR20040073628A (ko) * 2003-02-14 2004-08-21 주식회사 케이티 영상 전송시 소스-채널 결합 부호화의 부호율 결정 방법및 이를 이용한 영상 전송 시스템
CN101658045A (zh) * 2007-03-19 2010-02-24 弗劳恩霍夫应用研究促进协会 使用联合计算功率对多个信息信号进行编码
TWI411307B (zh) * 2010-08-11 2013-10-01 Univ Hungkuang Video playback fluency priority link source channel coding system
CN103716657A (zh) * 2013-12-31 2014-04-09 深圳市大富科技股份有限公司 一种信道的码率分配方法及系统

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5596602A (en) * 1995-03-24 1997-01-21 Eastman Kodak Company Data compression rate control method and apparatus
KR20040073628A (ko) * 2003-02-14 2004-08-21 주식회사 케이티 영상 전송시 소스-채널 결합 부호화의 부호율 결정 방법및 이를 이용한 영상 전송 시스템
CN101658045A (zh) * 2007-03-19 2010-02-24 弗劳恩霍夫应用研究促进协会 使用联合计算功率对多个信息信号进行编码
TWI411307B (zh) * 2010-08-11 2013-10-01 Univ Hungkuang Video playback fluency priority link source channel coding system
CN103716657A (zh) * 2013-12-31 2014-04-09 深圳市大富科技股份有限公司 一种信道的码率分配方法及系统

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