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On-board non-registering multispectral image lossless/lossy encoding system and on-board non-registering multispectral image lossless/lossy encoding method

A multi-spectral image and encoding technology, which is applied in the field of lossless and lossy predictive compression encoding for the original unregistered multi-spectral image on the star, can solve the problems of poor consistency of image standard deviation and poor code rate distribution, etc.

Active Publication Date: 2013-09-11
XIDIAN UNIV
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Problems solved by technology

Entropy is an important parameter to measure the amount of information in theory, but the consistency between image standard deviation and entropy is not good in practice, so the code rate allocation effect of this method is not good

Method used

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[0058] refer to figure 1 , the encoding system of the present invention includes: a spectral segment rearrangement unit, a spectral segment registration unit, a compression mode judgment unit, an image input selection switch, a code stream output selection switch, a lossless compression encoding unit and a lossy compression encoding unit.

[0059] The spectral segment rearrangement unit, for the input multispectral image {A 1 ,A 2 ,...,A i ,...,A n} to rearrange the spectral segments to obtain the optimal spectral segment coding sequence {s 1 ,s 2 ,...,s n}, select n-1 coded spectrum segments from n coded spectrum segments at the same time The best reference spectrum for And the optimal spectral segment coding order {s 1,s 2 ,...,s n} and the optimal reference spectrum number {k 1 ,k 2 ,...,k n-1} output to the spectrum registration unit, n represents the total number of spectrums, n≥4, n=4 in this example.

[0060] The spectral segment registration unit, accor...

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Abstract

The invention discloses an on-board non-registering multispectral image lossless / lossy encoding system and an on-board non-registering multispectral image lossless / lossy encoding method, and mainly solves problems of poor correlation between spectrums, inaccurate control of JPEG-LS (Joint Pho-tographic Experts Group-Lossless Standard) rate and low quality of image reconstruction caused by the fact that original on-board multispectral images are not registered in the prior art . The on-board non-registering multispectral image lossless / lossy encoding method includes: rearranging spectral segments of the non-registering multispectral images, registering each spectral segment of the multispectral images sequentially according to a sequence of optimal spectrum segment encoding, compressing the registered multispectral images in a lossless or lossy manner, selecting a prediction mode of a current encoding spectrum segment during lossy compressing, then performing JPEG-LS lossless compression on corresponding predicted residual, distributing object code rate of encoding spectrum segments during lossy compression, then selecting a prediction mode of current encoding spectrum segment to perform code-rate-controllable JPEG-LS lossless compression on corresponding predicted residual based on secondary iteration adjustment, and outputting code stream. The on-board non-registering multispectral image lossless / lossy encoding system and the on-board non-registering multispectral image lossless / lossy encoding method have the advantages of high compression performance and accurate rate control, and are applicable to various on-board multispectral data processing and transmission.

Description

technical field [0001] The present invention relates to the technical field of multispectral image processing, and further relates to a system and method for lossless and lossy predictive compression coding of original unregistered multispectral images on a star, which can be used for various onboard multispectral data processing and transmission . Background technique [0002] Multi-spectral image is a kind of three-dimensional image obtained by spectral imager imaging the same ground object in several to dozens of different spectral bands. It also contains the spatial and spectral information of the ground object. It is currently widely used in resource exploration , target recognition, environmental protection, etc. However, the amount of multispectral image data is very large, and effective compression technology is required to reduce the pressure of image storage and transmission. According to the requirements of the reconstructed image quality for ground applications...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N7/46
Inventor 王柯俨宋娟李云松张静雷杰王丽萍程如飞高雅静
Owner XIDIAN UNIV
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