期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2015
卷号：73
期号：1
出版社：Journal of Theoretical and Applied
摘要：This paper presents a noble theoretical method followed by an algorithm for analyzing the trajectory path of linear blood spatter drop in motion base on image of a crime scene. Linear blood spatter drop has some specific pattern with moderate droplet size (Reynolds number, Re >= 1) and elliptical or circular shaped stain. Their free flight trajectories are non-linear such as parabolic motion or motion with drag. So far, works been done using Stokes� law only for blood-droplet free flight trajectory of motion with drag, which is suitable for very small droplet (Reynolds number, Re << 1), like mist. However, it is not suitable for moderate droplet size. Hence, we introduce two regions of the drag force working on the droplet, Stokes� law and Newton�s law region depending on their size, velocity and Re values. It also takes into consideration the perturbed path for the droplet�s movement, given room for a small error, δ, for the angle and speed. Hence, more realistic reconstruction of trajectory path along with angle and speed of blood spatter drop compared to available ones. The proposed method could be very helpful for blood spatter image analysis for crime scene investigation in near future.
