计算机绘图作业拷贝的检测系统

The Checking System of Copying Computer Graphics Exercises

为制止计算机绘图教学中学生相互间拷贝绘图作业,对学生常用的拷贝方法、拷贝文件与源文件的文件属性、图元信息等特征信息的变化进行分析,研究了图形文件拷贝的检测方法,开发出以 VB 为工具的检测系统软件。检测系统通过 ActiveX Automation技术获取图形文件的特征信息,并加以分析比较,从而筛选出有拷贝可能的绘图作业,供人工进一步核实。经教学应用,能有效制止学生相互间拷贝抄袭,显著提高了计算机绘图的教学效果。

In order to refrain the students from copying their homework in the subject of computer graphics, through the analyses of the common copy methods and the changes of character information between the copies and source files, such as file attributes and the objects’ characters, this paper studies the checking methods of copying graphics files and develops a checking software system with VB. By comparing the character information of graphics files that is obtained with the technology of ActiveX Automation, the system can pick out all the possible copies which can be used to be further verified by artificial force. The practical application proved that the research efficiently refrain the students from copying exercises and evidently improve the teaching of computer graphics.