Characteristic parameters | Calculation formulas |
---|---|
Mean value | \(\mu = \sum\limits_{i = 0}^{L - 1} {iH(i)}\) |
Variance | \(\sigma^{2} = \sum\limits_{i = 0}^{L - 1} {(\mu - i)^{2} H(i)}\) |
Skewness | \(H_{s} = \frac{1}{{\sigma^{3} }}\sum\limits_{i = 0}^{L - 1} {(\mu - i)^{3} H(i)}\) |
Kurtosis | \(H_{k} = \frac{1}{{\sigma^{4} }}\sum\limits_{i = 0}^{L - 1} {(\mu - i)^{4} H(i) - 3}\) |
Energy | \(H_{e} = \sum\limits_{i = 0}^{L - 1} {H(i)^{2} }\) |
Entropy | \(H_{t} = - \sum\limits_{i = 0}^{L - 1} {H(i)\log_{2} (H(i))}\) |
Proportion of high signal pixels | \(P = \frac{1}{N}\sum\limits_{i = L/2}^{L - 1} {n_{i} }\) |
Grayscale corresponding to the right peak | \(Gs = g(\max \{ n_{r} \} , \, r = 50, \ldots ,L - 1)\) |