基于新型螺旋相位滤波器提高图像边缘增强对比度的方法

摘要

A new type of Bessel - like spiral phase filter for improving the contrast of image edge en- hancement was introduced. The analytical expressions to describe the point spread function of conventional Bessel -like spiral phase filters with topological charge were given and the edge enhancement for three differ- ent images such as circular aperture, Chinese character and onion epidermal cells were simulated. The results show that compared with the results of image edge enhancement of the conventional spiral phase filter, the con- trast of image edge enhancement with Bessel - like spiral phase filter is obviously higher.%提出了利用类贝塞尔螺旋相位滤波器实现提高图像边缘增强对比度的方法．给出了普通螺旋相位滤波器和类贝塞尔螺旋相位滤波器的点扩散函数，并利用圆孔、汉字和洋葱表皮细胞等三幅图像进行了边缘增强的模拟计算，发现与普通螺旋相位滤波器的图像边缘增强结果相比，基于类贝塞尔螺旋相位滤波器的图像边缘增强对比度得到显著提高．