Enhancement of spectral matching imager output for discriminating multiple similar spectra by time-nonlinear wavelength sweeping
Enhancement of spectral matching imager output for discriminating multiple similar spectra by time-nonlinear wavelength sweeping
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DOI：
10.1109/sii.2013.6776745
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
A. Kimachi;M. Doi;S. Nishi
中科院分区：
文献类型：
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作者：
A. Kimachi;M. Doi;S. Nishi
提出了一种增强光谱匹配成像仪（SMI）对多个相似光谱的输出差异的方法。在目标光谱的联合概率密度中引入光谱权函数，通过对SMI中的峰值波长进行非线性扫描来对角化协方差矩阵。权重函数，或等效的波长扫描函数，最佳地通过最小化由协方差矩阵的所有平方非对角元素的总和组成的成本函数来获得。在一组三个相似的光谱反射率上的实验结果表明，该方法有效地抑制了非对角元素的协方差矩阵估计的权重函数，以提高SMI输出的差异。
A method for enhancing the difference in the outputs of the spectral matching imager (SMI) for multiple similar spectra is proposed. A spectral weight function is introduced to the joint probability density of the target spectra for diagonalizing the covariance matrix by sweeping the peak wavelength in the SMI nonlinearly to time. The weight function, or equivalently a wavelength sweep function, is optimally obtained by minimizing a cost functional consisting of the sum of all the squared off-diagonal elements of the covariance matrix. The experimental results on a set of three similar spectral reflectances demonstrate that the proposed method effectively suppresses the off-diagonal elements of the covariance matrix with the estimated weight function to enhance the difference in SMI outputs.