It is the basis for the prevention and control of the crop diseases to detect accurately and rapidly the crop diseases according to the crop leaf symptoms. For accurate detection of the crop leaf diseases, a crop spot detection method is proposed based on Window Threshold Center-Symmetric Local Binary Pattern(WTCSLBP). Firstly, the disease leaf features are obtained and the threshold to judge the spot is estimated by Adaptive Local Binary Pattern(ALBP). Then the leaf image to be tested is divided into the s...