图像纹理特征提取，包括分形维数，灰度游程长度，灰度共生矩阵等五种图像纹理特征。-To extract image texture features, including fractal dimension, length of gray-level run-length, gray level co-occurrence matrix and other five kinds of image texture features。

纹理特征，灰度游程矩阵，这段代码很好用-gray level run-length

灰度游程矩阵四个方向，每个方向都有11个特征(Gray-level run-length, 11 features in total, four directions)

计算二维图像的灰度游程矩阵，并计算特征统计量(Calculating the gray range matrix of a two-dimensional image and calculating the characteristic statistics)