A kind of fast compression coding method of hyperspectral signal and image compression method

A technology of hyperspectral image and compression method, applied in the field of hyperspectral image compression, can solve the problems of low self-adaptive ability and large amount of calculation of data compression coding, and achieve strong self-adaptive ability, high-efficiency encoding, and computational complexity. low effect

Active Publication Date: 2011-12-28
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0010] The present invention aims at the disadvantages of weak self-adaptability and large amount of calculation in the prior art data compression coding, and proposes a fast coding method for hyperspectral signals, which can obtain higher compression ratio and high-efficiency coding under the premise of ensuring image quality

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  • A kind of fast compression coding method of hyperspectral signal and image compression method
  • A kind of fast compression coding method of hyperspectral signal and image compression method
  • A kind of fast compression coding method of hyperspectral signal and image compression method

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[0023] The following further describes the implementation of the present invention with reference to the drawings and specific examples. The fast encoding method for hyperspectral signals proposed by the present invention mainly includes:

[0024] 1. Initialization stage: Sort according to the first dimension of the input vector, generate the initial codebook according to the average group→select the first training vector of each group, calculate the error of each training vector and the codeword in the initial codebook, calculate the average error, and Set the number of iterations.

[0025] 2. Training phase: Use the inequality elimination algorithm to quickly search for the current best matching codeword, divide the current training vector into the cavities corresponding to the best matching codeword, train all training vectors, and update the current best match with the centroid of the cell cavity Codeword.

[0026] 3. Interruption check: If the number of iterations meets the...

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Abstract

The invention discloses a rapid hyperspectral signal compression scheme for a huge data volume of a hyperspectral image. By a compression coding scheme, the spatial and inter-spectrum correlation of the hyperspectral image is eliminated by adopting a vector quantization clustering technology, superior codeword is generated in combination with a conventional Linde Buzo Gray (LBG) clustering algorithm and a fast codeword searching algorithm, and simultaneously, coding is finished. Hadamard transform is performed on input vectors; and in a Hadamard domain, an initial codebook is constructed, andsimultaneously, fast clustering is performed by utilizing a three-step elimination inequality to effectively generate a final codebook and codes. By the hyperspectral image compression scheme provided by the invention, relatively lower image quality loss can be turned into a relatively greater compression ratio to fulfill the aim of fast coding in combination with the properties of the Hadamard transform and the characteristics of vector quantization.

Description

technical field [0001] The invention belongs to the technical field of image compression coding, in particular to hyperspectral image compression based on vector quantization data compression technology. Background technique [0002] With the continuous expansion of remote sensing technology in earth resources management, environmental detection, military detection and other application fields, the previous multispectral image data can no longer meet people's growing scientific research and production because of the improvement in spatial resolution. The advent of imaging spectrometers has made it possible to obtain image data with super-spectral resolution. Hyperspectral images have the characteristics of high number of bands (the number of bands is generally hundreds) and large amount of data. The size of a typical AVIRIS image is 614×512, and the number of imaging bands is 224. If the gray value of each pixel is Two bytes are stored, and the data volume of a group of im...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N19/94
Inventor 陈善学吴立彬王佳果周淑贤姚小凤
Owner CHONGQING UNIV OF POSTS & TELECOMM
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