关键词: 指纹, 方向图, 离散方向采样法, 灰度梯度法

Abstract: In order to enhance the accuracy of the fingerprint image orientation field，an improved method based on traditional fingerprint image orientation field computing algorithm-discrete orientation sampling method is proposed.On the foundation of the original sampling template，it comprehensive considers dates of all layers outside of the central pixel，and gives the improved sampling template.The experimental result indicates that the orientation field of fingerprint from the article method is more accurate than the traditional discrete orientation sampling method and the gray gradient method.

Key words: fingerprint, orientation field, discrete direction sampling, gray gradient