LOG滤波器提取边缘；用形态学方法提取骨架线；由明暗度提取外形信息；-LOG filter extraction edge; Morphological skeleton extraction methods; By extracting contour shading degrees;

Android使用Sobel算法提取图片轮廓的例子。非常值得大家借鉴。-Android image contour extraction algorithm using Sobel algorithm.A very worthy of our reference.