Chartoularios Institute, Piraeus, Greece.
Staffordshire University, Stoke-on-Trent, UK.
J Forensic Sci. 2022 Mar;67(2):651-668. doi: 10.1111/1556-4029.14927. Epub 2021 Nov 3.
Digitally captured signatures (DCS) are entering the scope of the Forensic Handwriting Examiner (FHE), and the meaningful comprehension and comparison of the captured information is essential in order to proceed to the examination of authenticity of DCS. In DCS solutions, force is captured and presented as pressure levels, but the relation between exercised force and the assigned pressure levels is not provided by the manufacturers of these solutions. For this purpose, we constructed an experimental array that allows the correlation of exercised force and assigned pressure levels, in a combination of three different digitizers, six different styli and four different capturing software. This process let us calculate the correlation function that assigns pressure levels to force for each solution (called the Zeta Function). Through this process, it was observed that different solutions follow different Zeta functions. To address this problem, a methodology for normalization of captured data between different solutions was created and demonstrated, using the calculated Zeta function and its inverse.
数字捕获签名（DCS）正在进入法医笔迹鉴定员（FHE）的范围，为了继续检查 DCS 的真实性，对捕获信息进行有意义的理解和比较至关重要。在 DCS 解决方案中，力被捕获并表示为压力水平，但这些解决方案的制造商并未提供所施加力与分配的压力水平之间的关系。为此，我们构建了一个实验数组，允许在三个不同的数字化仪、六种不同的触笔和四种不同的捕获软件的组合中，对所施加的力和分配的压力水平进行相关联。这个过程使我们能够为每个解决方案计算将压力水平分配给力的相关函数（称为 Zeta 函数）。通过这个过程，我们观察到不同的解决方案遵循不同的 Zeta 函数。为了解决这个问题，创建并演示了一种在不同解决方案之间对捕获数据进行归一化的方法，使用计算出的 Zeta 函数及其逆。
