中文摘要：

提出了一种非接触无损测量的指纹采集数字全息方法。构建了一套反射式离轴菲涅耳数字全息系统,研究了重构指纹振幅和相位图像的方法,并对引入的相位畸变用最小二乘曲面拟合法予以校正。实验中,对刑侦现场容易遗留犯罪嫌疑人潜在无色指纹的多种样品进行了指纹采集,同时得到了清晰的振幅像和相位图像。相位图像的获取增强了指纹信息量,充分表明了数字全息指纹采集方法运用于警用领域指纹采集的可行性,特别是对于无色指纹及其他弱强度信息的指纹更有实用意义。

英文摘要：

According to the need of investigation of criminal cases,we propose a non-destructive,contact-less fingerprint acquisition method based on the digital holography.The setup of the off-axis digital Fresnel holography is built,and the principle of recording and the reconstruction methods of the fingerprint amplitude and phase image are investigated.The surface fitting with the least square method is applied to correct the phase aberration.Experimentally,the clear amplitude and phase images are obtained from the potential and colorless fingerprints which can be left easily on variety of samples by suspects in criminal investigation site.The results demonstrate that the digital holographic fingerprint acquisition method can be used in the police field,especially for colorless fingerprint and the fingerprint with weak intensity information.