Computer projection auxiliary positioning method and interactive demonstration system using said method

Abstract

The invention provides an auxiliary positioning method of computer projection and the interactive demonstration system. The method is as follows. It is assumed that there is n anchor points (x1 ', y1 '), (x2 ', y2'),... (xn ', yn ') on the computer screen, corresponding to n projection points (x1, y1) and (x2, y2),... (xn, yn) on interactive projection screen. Once The n projection points are hit, and their coordinates information (x1, y1), (x2, y2),... (xn, yn) are transmitted to the computer. According to these information, all the parameters of the function p (x', y') = F (P (x, y)) are calculated, and then any operation points P (x, y) on interactive projection screen can be transformed into the anchor points p (x ', y ') on the computer screen. The system consists of interconnected computers, projectors and interactive projection screen. If the method is used for positioning projection coordinates, it would make beneficial effect to the distortion correction such as trapezoidal, pillow and nonlinear projection display images, and accurate information alternation between the interactive demonstration screen and the computer.

Description

technical field [0001] The invention relates to an auxiliary method for computer projection presentation and a computer projection presentation system using the method, more specifically, an auxiliary positioning method for computer projection presentation, and a demonstration system for information interaction using the method. Background technique [0002] In daily life and work, people often use whiteboards for classroom teaching or meeting discussions. Although whiteboards can be used for writing and drawing well, they can also be easily erased. However, the content written or drawn on the whiteboard cannot Preservation, copying, transmission and reproduction cannot meet the application requirements of the modern information society for teaching, conferences, etc. [0003] With the development of electronic technology, electronic whiteboards and computer interactive presentation systems have appeared in recent years. For example, US Patent No. 6,747,636, filed on Novembe...

AI Technical Summary

Problems solved by technology

In the demonstration method disclosed in U.S. Patent No. 6,747,636, it is disclosed that the coordinate information corresponding to the control signal generated on the demonstration screen on the four corners of the pre-stored demonstration image corrects the trapezoidal distortion, but for pincushion and Distortion such as nonlinearity, but no solution is given

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