Computer Vision, Graphics, and Image Processing
Three-dimensional object recognition from single two-dimensional images
Artificial Intelligence
Computational Approaches to Image Understanding
ACM Computing Surveys (CSUR)
Digital Picture Processing
Computer Vision
A hierarchical knowledge based system for airplane recognition
A hierarchical knowledge based system for airplane recognition
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Airplane classification is used as an application domain to illustrate how hierarchical reasoning on large knowledge bases can be implemented. The knowledge base is organized as a two-dimensional hierarchy: one dimension corresponds to the levels of complexity often seen in computer vision, and the other dimension corresponds to the complexity of hypothesis used in the reasoning process. Reasoning proceeds top-down, from more abstract levels with fewer details toward levels with more details. Whenever possible, with the help of domain knowledge, decision is taken at a higher level, which significantly reduces processing time. A software package called RuBICS (Rule-Based Image Classification System) is described, and some examples of airplane classification are shown.