无纸化阅卷中图像噪声的去除研究与优化

摘要

基于互联网的无纸化阅卷越来越广泛的应用于各种考试中.然而试卷在扫描、传输过程中不可避免的会受到噪声的干扰,使得试卷的图像效果不佳,这给阅卷工作带来很大的麻烦.为了解决这些问题,本文研究了新的阈值和改进的阈值函数的去噪效果,最后通过MATLAB进行模拟仿真,验证了它与传统的去噪方法相比确实有更好的去噪效果.%Paperless marking based on the Internet is applied more and more extensively in all kinds of exams. However, it is inevitable that there is some noise interference in the process of scanning papers and transmission, making paper image effect reduced, which brings a lot of trouble of marking work . According to these drawbacks, we has studied the de-noising effect of the new threshold and improved threshold function. Finally, through MATLAB simulation, we can conclude that compared with the traditional de-noising method the improved one has better effect.