当前墨迹伪造造成的经济损失逐年增加,基于此,提出一种基于扫频光学相干层析(SSOCT)的墨迹鉴别方法。使用自主搭建的SSOCT成像系统采集墨迹样品背向反射光强随深度下降的数据,通过数据拟合获得墨迹层的衰减系数,用以区分同种颜色不同品牌墨水在白纸上书写的墨迹。实验测得百乐牌墨迹衰减系数范围为0.1333~0.1434,得力牌墨迹衰减系数范围为0.1501~0.1695,英雄牌墨迹衰减系数范围为0.1748~0.1892。重建了使用三种墨水书写的“OCT”字母的X-Y横截面图像,实现了墨迹的鉴别与区分,验证了方法的可行性。

At present, the economic loss caused by the forgery of ink marks is increasing annually. This study presents a method for identifying ink marks using swept source optical coherence tomography (SSOCT). To acquire the back-scattered light intensity from ink marks written on white paper, a custom-built SSOCT system was used. The attenuation coefficient of each ink mark was obtained by data fitting, which was used to distinguish ink marks written with different brands of ink of the same color. Experiments show that the attenuation coefficient of PILOT ink, Deli ink, and Hero ink is in the range of 0.1333--0.1434, 0.1501--0.1695, and 0.1748--0.1892, respectively. We reconstructed X-Y cross-sectional images of characters written using different brands of ink. The ink marks can be distinguished successfully by the proposed method, which validates its feasibility.