Application of reflection transform imaging in handwriting trace detection
Wei Wei, Lihua Huang, Xinran Zhu, Huijie Huang · 14th National Conference on Laser Technology and Optoelectronics (LTO 2019) · 2019
Handwriting is a special kind of trace, which carries important information such as writing content, writing tools and writing habits. Reflection transform imaging (RTI) is a computational photography method that creates an interactive image to further display the 2D and 3D texture features of the inspection surface. In this paper, Reflection Transform Imaging is applied to study the colored and colorless handwriting traces produced by pen and water-based pen. By combining different lighting directions and rendering modes, not only the writing content of different handwriting traces can be obtained, but also the three-dimensional texture information of handwriting traces can be obtained. Especially for the colorless handwriting trace, the two-dimensional and three-dimensional texture of the handwriting detail features can reveal the differences between different writing tools and show the shape of the brush. The experimental results show that reflection transform imaging technique can clearly display the colored and colorless handwriting traces, and it can provide powerful help for the case detection by revealing various information hidden in the handwriting traces.