In common edge-enhancement techniques, mostly employed in digital image processing, all the edges of an object are enhanced simultaneously. Selective edge enhancement, a well-known technique in optics, on the other hand, is useful for controlled image representation and structural analysis of the images with applications in biology and chemistry. A simple yet versatile method for selective edge enhancement using a spatial bunch of filters, known as Walsh filters, applied in the Fourier domain has been presented in this paper. The method has been tested on different types of images such as camera images, and scanning electron microscope images. Experimental results with a half-circular object have been presented using reflective spatial light modulators (SLMs). After obtaining selective edges, Walsh filters have been rotated for ‘angular stitching’ to enhance edges in all possible radial directions. This makes this method superior to all previous selective edge enhancement methods using SLMs since it can be tuned to provide both selective or overall edge enhancements depending upon the situation.

在通常用于数字图像处理的常见边缘增强技术中，同时增强对象的所有边缘。另一方面，选择性边缘增强技术是光学领域的一种众所周知的技术，可用于控制图像表示以及图像在生物和化学领域的结构分析。本文提出了一种简单而通用的方法，该方法使用在傅立叶域中应用的一堆空间滤波器（称为Walsh滤波器）进行选择性边缘增强。该方法已在不同类型的图像（例如相机图像和扫描电子显微镜图像）上进行了测试。已经使用反射空间光调制器（SLM）呈现了半圆形物体的实验结果。获得选择性边缘后，沃尔什（Walsh）滤镜已经旋转以进行“角度缝合”，以增强所有可能的径向方向上的边缘。这使得该方法优于所有以前使用SLM的选择性边缘增强方法，因为可以根据情况对其进行调整以提供选择性或整体边缘增强功能。