A High-speed Vision System for Moment-based Analysis of….pdfVIP

A HIGH-SPEED VISION SYSTEM FOR MOMENT-BASED ANALYSIS OF NUMEROUS OBJECTS Yoshihiro WATANABE, Takashi KOMURO, and Masatoshi ISHIKAWA Graduate School of Information Science and Technology, University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. E-mail: Yoshihiro Watanabe@ipc.i.u-tokyo.ac.jp ABSTRACT 2. MOMENT-BASED ANALYSIS OF NUMEROUS OBJECTS We describe a high-speed vision system for real-time appli- In this paper, moments mean geometric moments. The (i+j )- th moment is calculated from: cations, which is capable of processing visual information at a frame rate of 1 kfps, including both imaging and pro- i j mij = x y I (x, y), (1) cessing. Our system performs moment-based analysis of nu- x y merous objects. Moments are useful values providing infor- mation about geometric features and invariant features with where I (x, y) is the value of a binary image at pixel (x, y). respect to image-plane transformations. In addition, the si- The moment can be converted to various geometric features, multaneous observation of numerous objects allows recogni- such as size, centroid, orientation, rough shape information, tion of various complex phenomena. The proposed system and so on [1]. Also, the moment can express values t