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Abstract: “Contrast” is an generic denomination for “difference”. Measures of contrast are a powerful tool in image processing and analysis, e.g., in denoising, edge detection, segmentation, classification, parameter estimation, change detection, and feature selection. We present a survey on techniques that aim at measuring the contrast between (i) samples of SAR imagery, and (ii) samples and models, with emphasis on those that employ the statistical properties of the data.
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Key words:
- Contrast /
- Divergence /
- Entropy /
- Geodesic distance /
- Statistics /
- Synthetic Aperture Radar (SAR)
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Table 1. (
$h,\phi$ )-divergences and related functions$\phi$ and$h$ $(h,\phi)$-divergence $h(y)$ $\phi(x)$ Kullback-Leibler $y$ $x\ln(x)$ Rényi (order $\beta$) $\dfrac{1}{\beta-1}\ln\left((\beta-1)y+1\right),\;0\leq y < \dfrac{1}{1-\beta}$ $\dfrac{x^{\beta}-\beta(x-1)-1}{\beta-1},0 < \beta<1$ Hellinger ${y}/{2},0\leq y<2$ $(\sqrt{x}-1)^2$ Bhattacharyya $-\ln(1-y),0\leq y < 1$ $-\sqrt{x}+\dfrac{x+1}{2}$ Jensen-Shannon $y$ $x\ln\left(\dfrac{2x}{x+1}\right)$ Arithmetic-geometric $y$ $\left(\dfrac{x+1}{2}\right)\ln \dfrac{x+1}{2x}$ Triangular $y,\;0\leq y <2$ $\dfrac{(x-1)^2}{x+1}$ Harmonic-mean $-\ln\left(-\dfrac{y}{2}+1\right),\;0\leq y < 2$ $\dfrac{(x-1)^2}{x+1}$ Table 2.
$h$ -$\phi$ entropies and related functions$(h,\phi)$-entropy $h(y)$ $\phi(x)$ Shannon[35] $y$ $-x\ln x$ Restricted Tsallis (order $\beta \in \mathbb{R}_{+}\,:\,\beta\neq 1$)[39] $y$ $\dfrac{x^\beta-x}{1-\beta} $ Rényi (order $\beta \in \mathbb{R}_+\,:\,\beta\neq 1$)[29] $\dfrac{\ln y}{1-\beta}$ $x^\beta$ Arimoto of order $\beta$ $\dfrac{\beta-1}{y^\beta-1}$ $x^{1/\beta}$ Sharma-Mittal of order $\beta$ $ \dfrac{\exp\{(\beta-1)y\} }{\beta-1}$ $ x\ln x$ -
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