Digitized tongue pictures' Fractal

<p>Fractal spectrums ƒ(α)-α of randomized fractal pictures were obtained, in which 8 parameters were used as characteristic quantities. αmin: The minimum value of singular exponent α; αmax: The maximum value of singular exponent α; ƒmin: Value of multiple fractal spectrum ƒ(α) corresponding to αmin; ƒmax Value of multiple fractal spectrum ƒ(α) corresponding to αmax; Spectral width: Value of αmax-αmin;； Spectral difference: Value of ƒmax-ƒmin;αd: Value of singular exponent α that resulted in maximum value of ƒ(α); B: One of the parameter in quadratic fit curve of ƒ(α), also termed as asymmetry degree.<br>