图像处理技术在阅卷系统中的应用

通过对答题卡特点的分析,设计了如何判别图像是否为答题卡,研究并改进了灰度处理算法去除了彩色图像的颜色对图像识别的干扰,以便使获得的数据根容易处理.在图像校正部分分析了图像偏转的现象,并根据特征点采集值的不同设计了倾斜角度计算的算法,设计了针对答题卡的图像旋转的算法,对发生偏转的图像进行适当的调整,以便满足评分判卷的要求.

Image Processing Technology in the Correct Papers System

Through to analyze the characteristic of the answer card,the method that distinguish whether the image is the answer card or not is designed.The gradation processing algorithm is studied and improved to remove the disturbance that colour in the colour image effect on the pattern recognition,so the data which obtained are processed easily.The image deflection phenomenon is analyzed in the image adjustment part,and the different algorithms of the angle of tilt computation are designed according to the characteristic point gathering value.The image revolving algorithm is designed in view of the answer card,which can carry on the suitable adjustment to the deflection image,so the request of correct the papers is satisfied.