LDP 算法是将与Kirsch 算子运算后得到的一些负值的邻域灰度值作为中心灰度值的编码因子，这将会导致中心灰度值不能很好的反映邻域局部特征信息，从而降低识别率。-LDP algorithm is will get some of the negative and Kirsch operator after the operation of neighborhood grayscale value as the center of grey value encoding factor, whic