【摘要】 对于指纹图像,无论在频域或是在空域处理时,都要用到指纹的方向性信息,所以求取指纹方向图就显得格外重要。求取指纹图像方向图的方法有很多种,文中列出了其中几种易于实现的算法。目的在于比较几种求取方向图的算法,得到这几种方法的性能,以利于不同场合的要求。更多还原

【Abstract】 In processing fingerprint images, directional information is used eith er in time-domain or in frequency-domain. So it is crucial to compute the direct ion map of fingerprint image. Several algorithms based on gray-scale gradient ar e compared in this article, and the objective is to obtain the characteristics t o use in different circumstances.更多还原