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DCT (Discrete Cosine Transformation)-based fast decoding method of segmented encoded signal

A segmented encoding and decoding method, which is applied in digital video signal modification, image communication, television, etc., can solve problems such as high computational complexity and poor real-time performance

Inactive Publication Date: 2011-10-12
SOUTHEAST UNIV
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Problems solved by technology

[0013] The technical problem to be solved by the present invention lies in the defects of high computational complexity and poor real-time performance of the existing decoding method based on DCT transform for segmentally encoded signals, and provides a fast decoding method for segmentally encoded signals based on DCT transform, This method has lower computational complexity and better real-time

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  • DCT (Discrete Cosine Transformation)-based fast decoding method of segmented encoded signal
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  • DCT (Discrete Cosine Transformation)-based fast decoding method of segmented encoded signal

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[0040] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0041] figure 1 Shows the process of traditional segmentation encoding, first the signal to be sent {x n} Equally divided into five segments {a m}, {b m}, {c m}, {d m}, {e m}, which is a m =x m , b m =x m+N / 5 , c m =x m+2N / 5 , d m =x m+3N / 5 , e m =x m+4N / 5 , m=0, 1, ..., N / 5-1, and perform DCT transformation on the above five sequences respectively to obtain their corresponding DCT domain coefficients {A i}, {B i}, {C i},{D i}, {E i}, i=0, 1, ..., N / 5-1, and then perform quantization, entropy coding and other processing on these five groups of coefficients to obtain the coefficient {A″ i},{B″ i},{C″ i},{D″ i}, {E″ i}, and transmit it to the receiving end or store it in the medium.

[0042] figure 2 Shows the flow of segmented decoding in the traditional method, firstly the received coefficient {A″ i},{B″ i},{C″ i},{D″ i}, ...

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Abstract

The invention discloses a DCT (Discrete Cosine Transformation)-based fast decoding method of a segmented encoded signal, belonging to the technical field of signal processing. The fast decoding method of the segmented encoded signal comprises the following steps of: transforming the DCT domain coefficients {Ai}, {Bi}, {Ci}, {Di}, {Ei} (i=0, 1, ......, N / 5-1) of signal sequences {am}, {bm}, {cm}, {dm}, {em} (m=0, 1, ......, N / 5-1) with the lengths of N / 5 into the DCT domain coefficient {Xk} (k=0, 1, ......, N-1) of an original encoded signal sequence {xn} (n=0, 1, ......, N-1) with the lengths of N, wherein the calculation of {Xk} is divided into five parts of {X5i}, {X5i+1}, {X5i+2}, { X5i+3}, { X5i+4} (i=0, 1, ......, N / 5-1) to be respectively carried out so as to reduce DCT transformation times, and therefore the complexity of the calculation in the decoding process is reduced. Compared with the prior art, the fast decoding method has the advantages of lower complexity and better decoding instantaneity.

Description

technical field [0001] The present invention relates to a decoding method, in particular to a decoding method based on DCT transformation, which is used for fast decoding segmented coded signals, and belongs to the technical field of signal processing. Background technique [0002] Codec is an extremely important part of digital signal processing technology. Coding refers to converting an input signal into a code that is optimized for transmission or storage. Decoding is the reverse process of coding. The codec process is usually completed by a codec device. The usual signal coding process usually includes time-domain forward transform, quantization, and entropy coding. The decoding process includes anti-entropy coding, inverse quantization, and frequency-domain inverse transform. [0003] Discrete Cosine Transform (DCT) is a very important mathematical tool in digital signal processing. It is very similar to the statistically optimal K-L transform, so it is widely used in ...

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/625
Inventor 舒华忠伍家松王膂李宝生罗立民
Owner SOUTHEAST UNIV
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