Research On Gesture Description And Sketch Design System In Conceptual Design

Conceptual design is a process of divergent thinking and innovative design, as well as an important stage during the manufacturing procedure that best reflects the design ideas of the person and determines the performance and cost of the product. Most traditional CAD systems need users to provide precise information. However, the idea in conceptual design is sketchy and short of detailed geometry information. Designers are bounded in the WIMP interactive mode. Their thought is broken by excessive switches among selection of menu, operations on buttons and keyboard input of words. The ubiquitous computing induces the idea of new design methods and interactive technologies to aid the conceptual design, especially by incorporating the natural pen-based user interface into the design process.Under the guidance of cognitive psychology and design Methodology, the paper deeply analyzes the issues in conceptual design process and supplies the method of computer aided conceptual designed.It makes use of both the interactive method based on gestures and the product information carrier based on sketch. It can express the design ideas better and mitigate the cognition load, so as to avoid the trouble operations of menus and buttons in WIMP. As well, it gives a natural and harmonious user interface.In this paper the gesture description model is discussed based on pen interaction in which gestures can be seen as one kind of interactive resources. Further discussion will give an interaction technology based on gesture and sketch. Upon the innovative design applications of pen-based sketch, the feature gestures are presented. Conceptual design history management based on sketch is provided for the designing process. The method above provides a wholelinkage from the resource description to resource application. The main creative contributions of this paper can be summarized as follow:1. Based on the analysis of the characteristics of conceptual design, under the guidance of creative thinking, the conceptual design mental model and process model are put forward. And the solution based on gesture and sketch is presented.2. The model of gesture interactive interface is given.Based on the analysis of gesture components, gesture interaction and gesture characteristic, the gesture description model and gesture multi-layered solution mechanism based on hierarchy concept model are presented.3. Based on the interaction pattern of user freedom, the interactive constraints capture for synchronous editing is put forward.The active constraint capture and bi-direct constrain solution are introduced to implement the associated design. It analyzes the dynamic context-aware technology based on gestures and provides the context-aware solution.4. By the way of user-centered design and the design method based on gesture and sketch, it provides the feature gestures modeling method for conceptual design on combination of feature and gesture. Instead of the traditional menu and button method, it incorporates gestures into the feature designing to simplify the complicated interaction process. By comparing the method with the traditional modeling mode, we can see that feature gestures are convenient and efficient for modeling.After introducing some backgrounds and the state of art of conceptual design and interaction technology, the solution is given based on gesture and sketch in Chapter 2; Chapter 3 and 4 describe the two key components of the solution: gesture description and interaction technology based on gesture and sketch; In Chapter 5, We introduce the feature gestures modeling method; In Chapter 6, conceptual design history management based on sketch is given; Chapter 7 introduces two prototype systems implemented under our method. Finally, we conclude this dissertation and discuss some directions for future work.