The Key Technology Of Hand-drawn Sketch Interface Design

Thanks to the rapid development of science and technology, computers become more and more powerful and easily available today. People expect computers not only to perform traditional computational jobs, but also to assist in human-oriented tasks, such as drawing, writing, designing, and so on. This kind of expectation calls for the shift from traditional machine-oriented interface to the interface supporting more humanistic properties, such as ambiguity, creativity, and informal communication capability.Designers often need to write down their improvisatory ideas. In that process, they concentrate on their creative ideas instead of symbols they using to deliver their thoughts. That means, designers' sketches employ uncertainty, or to say, ambiguity. However, most of the current graph constructing tools, require users to input graphic components using mouse/keyboard with lots of toolbar buttons or menu items for selection. This inconvenient, formal, and unnatural user interface is not suitable for creative tasks, especially not applicable on handled environments, with small screens and no keyboards. Sketch-based User Interface offers a good solution to this problem. That is, drawing by sketch, then recognize and regularize them interactively to obtain the final design. This kind of solution combines traditional pen/paper-based design approaches and electronic equipments harmoniously.This thesis put forward a freehand form-sketching user interface for schematic/conceptual design tasks. The research work this thesis focuses on the technology in the creation and interaction of freehand form-sketching. Most computer programs only provide a mouse-and-palette based user interface for editing form-shapes, which can be cumbersome to use in this area. To draw a form-shape, a user has to select the desired shape from a menu or a hierarchy of menus, and then makes a series of adjustments to the shape. A more convenient approach is to allow the user to sketch the desired shape directly and then replace it with a 'beautified' form-shape with the correct transformation, all in one step. We are working to change this by creating freehand form-sketching techniques that enable a program to generate the form-shapes directly from the users' ordinary sketches.This paper based on freehand-sketching, according to background of...