基于手绘草图的方案设计CAD系统

采用在线手绘草图识别和理解技术,设计并实现了一个支持用户流畅输人的二维方案设计CAD系统.该系统的主要特点体现在3个方面:采用一种基于曲率的笔画分割方法,能适应不同用户的输入习惯;提供了基于上下文的显著图符成组功能,可以支持用户方案构思过程中手绘输入的流畅性;引入主动纠错机制,提高了基于草图文法的图符识别效果.最后,用针对电路图设计所开发的原型系统验证了该方法的有效性.

Sketch-Based Conceptual CAD System

A prototype of pen-based scheme with continuous drawing of multi-symbols design system is presented in the paper. The system can deal without any interruptions or constraints. It has three characteristics. First, through the curvature-based segmentation technique, strokes are described in a uniform format so as to eliminate the difference among the drawing styles of users. Second, a parsing mechanism has been employed, which can automatically separate the successive input into meaningful units. And finally, the introduction of active error correction mechanism can increase the precision of symbol recognition. Experiment of circuit design proved the efficiency.