A New Design Paradigm Based on Sketch and Retrieval

نویسندگان

  • Jiantao Pu
  • Noel Titus
  • Karthik Ramani
چکیده

To improve the efficiency and naturalness of computeraided design (CAD), this paper introduces a new design paradigm in which a highly interactive sketch-based user interface and a design-knowledge reuse based on retrieval are combined seamlessly. Freehand sketching serves as a cognitive tool to support users’ intuitive abilities by exploring the visual components of a design. Design knowledge reuse is achieved by searching the similar designs in an existing library. To demonstrate the validity of this design paradigm, we implemented two prototype systems aimed at 2D and 3D design respectively. They both use the same key components: sketch beautification module, a constraint solver, a 2D&3D search engine and a sketch-based user interface. The preliminary usability evaluation shows that our proposed design paradigm is more natural for usage and has higher efficiency than the traditional CAD systems. INTRODUCTION Computer Aided Design (CAD) has emerged as an important tool to facilitate the design process. As a knowledge intensive activity, the modern design process is becoming more and more complicated due to the highly limited design time and the product complexity. Consequently, the available CAD tools are often found to be inadequate and inconvenient to use, and their limitations lie in two main aspects: (1) The traditional WIMP (Windows, Icons, Menus, and Pointing Devices) interface paradigm still dominates user interfaces in most CAD applications and can not provide a designer with a natural way to express his creative ideas. Users have to be well trained and familiar with necessary functions and rules provided in a CAD system. (2) Designers do not have efficient means to harness and reuse previous knowledge and experiences. Conservative estimates suggest that more than 75% of engineering design activity comprises reuse of previous design knowledge to address a new design problem [1]. The design process has to undergo several iterations because of the lack of means to reuse past knowledge and learn from past mistakes. Also, only a limited set of design concepts are carried forward for detailed design. In the past decades, a large number of 2D drawings and 3D models in engineering fields (e.g., architecture and mechanical domains) have been produced, and they are two main ways to express and communicate design ideas. Reusing and sharing the knowledge embedded in the two representations is becoming an important way to accelerate the design process, improve product quality, and reduce costs. Significant amounts of knowledge embedded in 2D drawings and 3D models created by other personnel cannot be immediately searched and reused in design stages. Therefore, it is necessary to provide designers with a way to retrieve 3D models or 2D drawings in an intuitive way. Sketch-based User Interface Sketch Beautification 2D & 3D Shape Search Engine Geometric Constraint Solver Design Results 2D Shapes (e.g., legcy drawings) & 3D Models Figure 1: The framework of our design paradigm based on sketch and retrieval. In this paper, we propose a new design paradigm which is supported by sketch-based interaction and retrieval-based

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تاریخ انتشار 2006