笔输入草图的分层识别

Three-Tiered Recognition Method of Pen-Based Sketch

针对计算机支持的草图设计技术中的草图识别这个核心问题 ,给出了一套分步逐层的识别方案 :从原始笔划的在线识别与线元转换 ,到几何层基于上下文的草图规整 ,到语义层基于领域知识的草图理解 整个识别过程通过一个带有黑板的知识库系统实现 ,逐步有效地解决了草图的模糊性与不确定性 ,将原始草图转换为精确的几何图形 文中方法已经过原型草图工具系统ISID的验证 。

A step-by-step sketch recognition method was presented to dissolve the illegibility and uncertainty of pen-based sketch. As the core technique of computer supported sketching, the sketch recognition included three tiers: on-line stroke recognition, sketch beautification from the geometric view, and sketch understanding from the semantic view. A knowledge base system (KBS) with a blackboard performed the recognition task well. So that the rough strokes was transformed into geometric line-elements, tidied up by adding available geometric relations and constraints, and finally turned into regular and precise geometric objects. It has been certified by a prototype sketching system, ISID, with promising effect.