Information content exploitation of imaging spectrometer's images for lossless compression

Jianyu Wang; Zhenyu Zhu; Kan Lin

doi:10.1117/12.258080

13 November 1996 Information content exploitation of imaging spectrometer's images for lossless compression

Jianyu Wang, Zhenyu Zhu, Kan Lin

Proceedings Volume 2819, Imaging Spectrometry II; (1996) https://doi.org/10.1117/12.258080
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Imaging spectrometer, such as MAIS produces a tremendous volume of image data with up to 5.12 Mbps raw data rate, which needs urgently a real-time, efficient and reversible compression implementation. Between the lossy scheme with high compression ratio and the lossless scheme with high fidelity, we must make our choice based on the particular information content analysis of each imaging spectrometer's image data. In this paper, we present a careful analysis of information-preserving compression of imaging spectrometer MAIS with an entropy and autocorrelation study on the hyperspectral images. First, the statistical information in an actual MAIS image, captured in Marble Bar Australia, is measured with its entropy, conditional entropy, mutual information and autocorrelation coefficients on both spatial dimensions and spectral dimension. With these careful analyses, it is shown that there is high redundancy existing in the spatial dimensions, but the correlation in spectral dimension of the raw images is smaller than expected. The main reason of the nonstationarity on spectral dimension is attributed to the instruments's discrepancy on detector's response and channel's amplification in different spectral bands. To restore its natural correlation, we preprocess the signal in advance. There are two methods to accomplish this requirement: onboard radiation calibration and normalization. A better result can be achieved by the former one. After preprocessing, the spectral correlation increases so high that it contributes much redundancy in addition to spatial correlation. At last, an on-board hardware implementation for the lossless compression is presented with an ideal result.

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Jianyu Wang, Zhenyu Zhu, and Kan Lin "Information content exploitation of imaging spectrometer's images for lossless compression", Proc. SPIE 2819, Imaging Spectrometry II, (13 November 1996); https://doi.org/10.1117/12.258080

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KEYWORDS

Image compression

Spectroscopy

Calibration

Earth observing sensors

Landsat

Statistical analysis

Image information entropy

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