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Bit stream transmission method combing SPIHT compression and unequal error protection coding

An error protection and stream transmission technology, applied in the direction of error prevention, transmission system, digital transmission system, etc., can solve the decoding packet loss strategy and code rate optimization without analysis, the image cannot be embedded image transmission, and cannot be embedded Image transmission and other issues

Inactive Publication Date: 2011-02-23
BEIHANG UNIV
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Problems solved by technology

The document "Unequal Error Protection of SPIHT Encoded Image Bit Streams" (Unequal Error Protection of SPIHT Encoded Image Bit Streams) divides all bit streams into position bit stream and information bit stream based on the analysis of SPIHT bit streams Two parts, and then use different bit rate channel coding to protect it, but this method makes the image impossible for embedded image transmission
However, although the document "Error Recovery Technique for Multilevel Tree Set Splitting Algorithm for Coded Color Images" (Error Reilient Technique for SPIHT Coded Color Images) can solve the above-mentioned shortcoming that cannot carry out embedded image transmission to a certain extent, it is in Decoding packet loss strategy and bit rate optimization are not analyzed

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  • Bit stream transmission method combing SPIHT compression and unequal error protection coding
  • Bit stream transmission method combing SPIHT compression and unequal error protection coding
  • Bit stream transmission method combing SPIHT compression and unequal error protection coding

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Embodiment Construction

[0057] Combine below figure 1 , 2, 3, 4, 5, and assume that the channel capacity is R t bpp(bit per pixel), image size is 512X512, R c ={R 1 , R 2 ,...R K} is the set of channel coding rates, where R 1 2 K , then the total number of bits that can be sent can be calculated L=R t *512*512, T=1024=2 10 , that is N=10,

[0058] sender:

[0059] Step 1: Follow the figure 2 The format of the data packet header shown is filled with data according to the parameters of the SPIHT algorithm, and only the maximum threshold value can be filled at this time.

[0060] Step 2: According to the method of the present invention, the SPIHT data stream is divided into three types: LSP, LIP, and LIS. For example, files can be created for different types of data streams to store.

[0061] Step 3: extract each type of data flow successively by threshold value, and carry out code rate optimization algorithm in the method for the present invention to all three types of data flow and carry o...

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Abstract

The invention discloses a bit stream transmission method combing SPIHT (set partitioning in hierarchical trees) compression and unequal error protection coding. The method comprises the following steps of: at a transmitting end, dividing SPIHT bit stream into three types of LSP (unimportant subset set), LIP (unimportant pixel set) and LIS (important coefficient set), extracting and packing various bit streams according to a threshold value in turn, and protecting the channel coding bit rate output by a bit rate optimization algorithm according to the type, wherein five steps are implemented in the transmitting end; and implementing four steps at a receiving end, wherein the method receives effective decoding bit stream as much as possible according to the SPIHT decoding characteristics). Therefore, according to the scheme, the method keeps the embedded property of the SPIHT bit stream, realizes optimization of the bit rate and fully considers the property of the SPIHT bit stream during decoding. The method has good practical value and broad application prospect in the technical field of wireless communication.

Description

(1) Technical field: [0001] The present invention relates to a code stream transmission method in joint source channel coding, in particular to a joint wavelet multi-level tree set split image compression and unequal error protection coding code stream transmission related to wireless multimedia data transmission such as images or videos The method is suitable for realizing efficient and reliable transmission of high-speed data in complex wireless channels, and belongs to the technical field of wireless communication. (2) Technical background: [0002] With the rapid development of wireless communication technology and the continuous expansion of wireless communication services, future wireless communication systems are required to support higher rate data services, especially the efficient and reliable transmission of multimedia data services (images, audio and video, etc.). Under the condition of limited bandwidth, the transmission of multimedia information with a large am...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 修春娣刘建伟朱华亮尚涛毛剑郑志明
Owner BEIHANG UNIV
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