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提出了用计算全息制作三类Haar子波滤波器的方法。将一维Haar子波函数组合,将得到三种类型的二维Haar子波函数,利用这三类二维Haar子波可以分别对图像进行角、水平边和垂直边的提取。采用罗曼Ⅲ型迂回位相编码法对三类Haar子波函数进行编码,绘出计算全息图。为了提高全息图的质量,采用显示器分屏抓图的办法,将全息图分割输出。在4f系统中实现对二维图像的三类Haar子波变换,给出了提取二值图像特征的模拟结果。
A method of making three types of Haar wavelet filters using holographic calculation is proposed. Combining one-dimensional Haar wavelet functions, three types of two-dimensional Haar wavelet functions are obtained. Using these three types of two-dimensional Haar wavelet, we can extract the corners, horizontal edges and vertical edges respectively. The three types of Haar wavelet functions are coded by Roman Ⅲ roundabout phase coding, and the calculated hologram is drawn. In order to improve the quality of the hologram, the monitor split screen capture method, the hologram segmentation output. In the 4f system, three kinds of Haar wavelet transform of two-dimensional image are realized, and the simulation results of extracting binary image feature are given.