方向采样的离散方向滤波器实现导向滤波

Implementation of steerable filter by using orientation-sampled discrete orientation filter

针对在图像处理中被广泛使用的导向滤波器,提出了一种比较实际的问题,即方向滤波器为方向上采样的一组离散滤波器,而且它们的解析表达式不知道的情形。为减少运算量,方形边框上旋转的方式被提出,这样旋转变换不涉及正弦、余弦三角运算。仿真实验结果验证了所提算法的有效性。同时还给出了一个有意义的结果,利用小波实现近似导向的方向滤波。

The steerable filters are widely used in image processing. For the steerable filters, this paper proposes a more practical scenar： oriented filters are a group of discrete filters sampled in the orientation and their analytical expressions are unknown. To reduce the amount of calculation, the rotation on the square curves method is proposed, in such a way that the transform is not involved with sine and cosine triangular calculation. The results of the simulation experiments verify the validation of the proposed algorithm, meanwhile this paper presents an interesting restllt： wavelet transform realizes approximate steerable oriented filtering.