Research On Dynamic Geometry System Based On Image Recognition Technology

With the development of computer science and information technology, the Web-Based Learning Resource Library (WBLRL) spring up like mushrooms. There are plenty of WBLRLs nowadays, but many of them are inefficient, people cannot make full use of them, especially for Geometry Learning Resource Library.The author noticed that most of the geometric figures saved in the resource library were in formats as bmp, jpg, png etc. This resulted in two big problems for the users: 1. It is very difficult to search the required information; 2. the geometric figures in the resource library cannot perform dynamic geometry transform.This paper put forward a solution to these problems—design a dynamic geometry system based on image recognition.Firstly, the paper discussed image recognition. From analyzing some recognition algorithm such as Hough transform algorithm and its improvements, Freeman chain code algorithm and its improvements, and image recognition algorithm using primitive region, the most efficient recognition algorithm was chosen—image recognition algorithm using primitive region. By designing the hierarchy of the system and the class of each part, the system has realized the recognition of points, lines, and circles in bmp picture.Secondly, the paper discussed the recognition of geometric relation between any two graphic elements. In the first stage of image recognition, all the graphic elements are independent. According to the positions of the graphic elements in the original picture, the system constructs the corresponding relationship between them. The main geometric relations recognized in the system are as follows: point on a line, parallel lines, perpendicular lines, lines intersection, intersection between line and circle, intersection between two circles, isosceles triangle and regular triangle.Finally, the paper realized the dynamic geometry part of the system. The main work in the realization of dynamic geometry was to construct the restricted relations of the graphic elements.