【摘要】 提出并实现了一种指纹合成方法.该方法通过新的联合方向场模型生成更加符合真实指纹的方向场,并提出一种新的指纹密度图的表示方法.然后,通过改进的Gabor滤波器生成指纹脊线纹理.该方法包括两个主要步骤:首先,经过指纹方向场生成、密度图生成和脊线纹理生成产生一个指纹模板图像;然后对指纹模板图像进行一系列变换,包括添加划痕、纹理平移、脊线的膨胀/腐蚀、脊线的弹性形变、脊线的加噪和平滑、图像的平移和旋转、改变对比度、添加背景噪声,最终得到类似于真实指纹的合成指纹图像.基于该方法的指纹生成器平台,已在2004年中国生物特征竞赛中得到应用和检验.实验结果验证了该方法的有效性和鲁棒性.更多还原

【Abstract】 A synthetic fingerprint generation method is presented and implemented in this paper. A new combination model for the orientation field of fingerprint is applied to generate more realistic fingerprint direction map, and a new expression of the fingerprint density map is presented. Then a modified Gabor filter is used for ridge pattern generation. This method consists of two main processes: First, a master-fingerprint image is generated after direction map generation, density map generation and ridge pattern generation. Then a realistic synthetic fingerprint is obtained through a series of steps on the master-fingerprint, including adding scratches, displacement of ridges, erosion or dilation of ridges, distortion, noising and rendering, global displacement and rotation, changing contrast and adding background noise. The synthetic fingerprint generation platform implemented with this method has been applied and verified in Biometrics Verification Competition 2004. Finally, the numerical experimental results approve the validity and robustness of the method.更多还原