An adaptive two-stage KLT scheme for spectral decorrelation in hyperspectral bandwidth compression

John A. Saghri; Seton Schroeder; Andrew G. Tescher

doi:10.1117/12.829000

2 September 2009 An adaptive two-stage KLT scheme for spectral decorrelation in hyperspectral bandwidth compression

John A. Saghri, Seton Schroeder, Andrew G. Tescher

Proceedings Volume 7443, Applications of Digital Image Processing XXXII; 744313 (2009) https://doi.org/10.1117/12.829000
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

A computationally efficient adaptive 2-stage Karhunen-Loeve Transform (KLT) scheme for spectral decorrelation in hyperspectal lossy bandwidth compression is presented. The component decorrelation of the JPEG 2000 (extension 2) is replaced with the proposed adaptive 2-stage KLT spectral decorrelation scheme. Direct application of a single KLT across the entire set of hyperspectal imagery may not be computationally practical. The proposed scheme alleviates this problem by partitioning the spectral data set into small subsets. The spectral correlation within each partition is removed via the 1st-stage KLT operation. To remove the remaining inter-partition correlation, a 2nd-stage KLT is applied to the top few sets of eaui-level principal component (PC) images from the 1st-stage. The computation savings resulting from 2-stage KLT is parametrically quantified. The proposed adaptive 2-stage KLT uses only a fraction of the equi-level 1st-stage PC images in the 2nd-stage KLT process. This adaptive scheme results in reducing the size of the 2nd-stage KLT transformation matrices and further improvement in computational complexity and coding efficiency. It is shown that reconstructed image quality, as measured via statistical and/or machine-based exploitation measures, is improved by using a smaller partition size in the 1st-stage KLT. A criterion based on the components of the eigenvectors of the cross-covariance matrix is established to identify such 1st-stage PC images. The proposed adaptive spectral decorrelation scheme also reduces the overhead bits required to transmit the covariance matrices, or eigenvectors, along the coding bit stream to the receiver through the downlink channel.

Citation Download Citation

John A. Saghri, Seton Schroeder, and Andrew G. Tescher "An adaptive two-stage KLT scheme for spectral decorrelation in hyperspectral bandwidth compression", Proc. SPIE 7443, Applications of Digital Image Processing XXXII, 744313 (2 September 2009); https://doi.org/10.1117/12.829000

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available