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This paper proposed a plane position detection method based on coding identification, discusses key problems to be solved in design of interactive electronic whiteboard with this method, gives structure and optical path design method of pen-based sensing system, discusses plane position coding method, comes up with solutions of coding of discontinuous code area and incremental coding of continuous code area, and analyzes the realization and performance. As for deviation in design of interactive electronic whiteboard with this method, three-point calibration algorithm is used for the system. This method effectively solves deviation caused by panning, zooming and rotation between image and whiteboard. The electronic whiteboard designed with this method is characterized by low cost, simple structure, etc.

A New Kind of Position Location Sensor Based on Encode and the Application Research