Parameters optimization for wavelet denoising based on normalized spectral angle and threshold constraint machine learning

Hao Li; Yong Ma; Kun Liang; Yong Tian; Rui Wang

doi:10.1117/1.JRS.6.063579

4 October 2012 Parameters optimization for wavelet denoising based on normalized spectral angle and threshold constraint machine learning

Hao Li, Yong Ma, Kun Liang, Yong Tian, Rui Wang

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 6, Issue 1, 063579 (October 2012). https://doi.org/10.1117/1.JRS.6.063579

Abstract

Wavelet parameters (e.g., wavelet type, level of decomposition) affect the performance of the wavelet denoising algorithm in hyperspectral applications. Current studies select the best wavelet parameters for a single spectral curve by comparing similarity criteria such as spectral angle (SA). However, the method to find the best parameters for a spectral library that contains multiple spectra has not been studied. In this paper, a criterion named normalized spectral angle (NSA) is proposed. By comparing NSA, the best combination of parameters for a spectral library can be selected. Moreover, a fast algorithm based on threshold constraint and machine learning is developed to reduce the time of a full search. After several iterations of learning, the combination of parameters that constantly surpasses a threshold is selected. The experiments proved that by using the NSA criterion, the SA values decreased significantly, and the fast algorithm could save 80% time consumption, while the denoising performance was not obviously impaired.

Citation Download Citation

Hao Li, Yong Ma, Kun Liang, Yong Tian, and Rui Wang "Parameters optimization for wavelet denoising based on normalized spectral angle and threshold constraint machine learning," Journal of Applied Remote Sensing 6(1), 063579 (4 October 2012). https://doi.org/10.1117/1.JRS.6.063579

Published: 4 October 2012

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