笔画交叉时序鉴定历来是刑事科学技术物证检验工作的难点之一。当前,鉴定可疑文件笔画交叉时序的方法通常有三种:(1)借助显微镜,发现一些表观特征;(2)利用打字机胶带提取技术来提取交叉处圆珠笔笔画;(3)通过测量交叉笔画与样本的色度差来判定书写顺序。由于交叉处有色料混合现象,传统的方法仍存在缺点和不足。台湾学者KUN-CHENG,M.SC发明了一种新方法:使用激光扫描同焦 Timing of cross-stroke stroke identification has always been one of the difficulties in the verification of criminal science and technology evidence. At present, there are usually three ways to identify the cross-timing of strokes in suspicious documents: (1) some apparent features are found by means of a microscope; (2) cross-hatch ballpoint strokes are extracted using typewriter tape extraction; (3) Color difference to determine the order of writing. Due to the mixed color material at the intersection, the traditional methods still have disadvantages and deficiencies. Taiwan scholar KUN-CHENG, M.SC invented a new method: the use of laser scanning with coke