Gabor滤波--Gabor Filters
来源:互联网 发布:身体强壮知乎 编辑:程序博客网 时间:2024/04/29 06:58
(11)
where s(x,y) is a complex sinusoid, known as a carrier, and is a 2-D Gaussian shaped function, known as envelope. The complex sinusoid is defined as follows, (12)
The 2-D Gaussian function is defined as follows, (13)
Thus the 2-D Gabor filter can be written as: (14)
The frequency response of the filter is:
(15)
= where, This is equivalent to translating the Gaussian function by in the frequency domain. Thus the Gabor function can be thought of as being a Gaussian function shifted in frequency to position i.e at a distance of from the origin and at an orientation of . In the above 2 equations, (,) are referred to as the Gabor filter spatial central frequency. The parameters are the standard deviation of the Gaussian envelope along X and Y directions and determine the filter bandwidth.Figure 7 shows the output of the Gabor filter at four orientations, when the input is an image containing lines at similar frequencies but at different angles. It can be seen that the filter at orientation has a strong response to the region when the variation is also along angle . In this case, a simple smoothing operation followed by thresholding is enough to segment the image into four regions corresponding to the lines at four orientations. By passing an image through a Gabor filter defined by the parameters ( , we obtain all those components in the image that have their energies concentrated near the spatial frequency point .
from: http://www.cs.utah.edu/~arul/report/node13.html
0 0
- Gabor滤波--Gabor Filters
- Gabor滤波器:Gabor Filters
- Gabor滤波
- Gabor 滤波
- Gabor滤波
- Gabor滤波
- Log-Gabor Filters
- 基于Gabor滤波的纹理分割 Texture Segmentation Using Gabor Filters
- Gabor
- gabor
- Gabor滤波小结
- Gabor滤波小结
- Gabor滤波 卷积
- opencv Gabor滤波函数
- OpenCV实现Gabor滤波
- Gabor滤波小结
- Gabor滤波小结整理
- Gabor滤波入门
- 一些很有用的教程(pdf版)
- soui中apng 图像解码器解码图片后像素格式研究
- chenxuewen.me
- float属性
- javascript跨域获取json数据
- Gabor滤波--Gabor Filters
- log4net配置文件详解
- hadoop学习之旅--学习目录
- Android设计模式之一个例子让你彻底明白工厂模式(Factory Pattern)
- cf337div2 B
- Object-C回顾 类
- JS 正则表达式应用
- 【动态规划】最长公共子序列
- 输入6个字符串,并对它们从小到大顺序排序后输出