In this chapter, we briefly state the relationship of this thesis to similar work in the related field classified into four categories: gestural interfaces, visual language systems, pattern recognition systems, and graphical structure editors. The general relationships are as follows: A handsketch-based diagram editor is a specific application of gestural interfaces. Diagrams are visual languages, and diagram processing relates closely to concepts of visual programming systems. The key problem of handsketch-based diagram editing is the on-line gesture recognition which is a pattern recognition problem. A diagram editor is a graphical structure editor with specific input technique.
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