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Joint source-channel coding method based on wavelet frame transform

A wavelet frame and channel coding technology, applied in image communication, digital video signal modification, television, etc., can solve the problem of channel error sensitivity

Inactive Publication Date: 2010-07-21
BEIHANG UNIV
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Problems solved by technology

The disadvantage of the wavelet SPIHT algorithm is that it is sensitive to channel errors, and it can be further protected by channel coding the source code stream, so that a certain loss of compression ratio is exchanged for the anti-error performance of the source code stream

Method used

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  • Joint source-channel coding method based on wavelet frame transform
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  • Joint source-channel coding method based on wavelet frame transform

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Embodiment Construction

[0068] See figure 1 , figure 2 , image 3 Shown, take 16 * 16 image matrix as example below, carry out the wavelet frame transformation of n=2 to it, channel coding considers adopting three kinds of different code rates (Rate1

[0069] sender:

[0070] Step 1: The original 16×16 image matrix is ​​decomposed by the wavelet frame decomposer, and the low frequency (LL 2 ), level (LH 2 , LH 1 ), vertical (HL 2 , HL 1 ), diagonally (HH 2 , HH 1 ) has a total of 7 coefficient matrices.

[0071] Step 2: These 7 coefficients are divided into low-frequency LL by matrix coefficient divider n matrix, and respectively by LH 2 and LH 1 , HL 2 and HL 1 , HH 2 and HH 1 Composed of three subtree matrices....

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Abstract

The invention discloses a joint source-channel coding method based on wavelet frame transform. A transmitting end comprises the following steps: 1. after processed by a wavelet frame decomposer, an original image is converted into sub-images with different frequencies; 2. predictive coding is carried out on a low-frequency coefficient matrix, and respectively independent SPIHT compression coding is carried out to three subtree matrixes; 3. a controller classifies compressed code flow according to importance; 4. a channel encoder carries out unequal error protection to different source code flows with different importance levels, and coding output is sent to a wireless channel by parallel / serial conversion and a modulator. A receiving end comprises the following steps: 1. a receipt signal enters a corresponding channel decoder by the parallel / serial conversion and the modulator to finish the channel coding with different code rates; 2. the controller outputs and reconstructs codings to form four parts of code flows which correspond to the low-frequency coefficient matrix and the three subtree matrixes; 3. the four parts of the code flows are respectively decompressed, and a coefficient matrix after initial transform is calculated out; 4. a wavelet frame reconstructing device regains the original image by the coefficient matrix.

Description

(1) Technical field: [0001] The present invention relates to a joint source channel coding method in a wireless communication system, in particular to a joint source channel coding method based on wavelet frame transform related to the transmission of multimedia data such as images or videos. Realizing efficient and reliable transmission of high-speed data in a wireless channel belongs to the technical field of wireless communication. (2) Technical background: [0002] With the rapid growth of multimedia information (image, audio and video, etc.) and the rapid development of communication technology, the future broadband wireless communication system needs to support high-quality transmission of multimedia services with higher data rates. Under the condition of limited bandwidth, the existing system widely adopts high-fidelity data compression technology with large compression ratio to achieve high-efficiency compression coding of multimedia sources, so as to make full use o...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/124H04N19/48H04N19/63H04N19/67
Inventor 修春娣朱华亮刘建伟
Owner BEIHANG UNIV
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