Image Registration Method Based on Nonseparable Wavelet Decomposition
Liu Bi · Jisuanji gongcheng · 2014
Tensor product wavelet only emphasizes on the edge of the horizontal and vertical direction. Nonseparable wavelet is isotropic,can extract the edge of the image in all directions,and can obtain relatively complete outline of the image. When this kind of characteristics is applied to the image registration,it can acquire the accurate positions of the invariant points of the affine transform. Based on this characteristic,this paper proposes an image registration method through calculating the registration parameters of the high-frequency sub-images of the nonseparable wavelet decomposition of the original image. This method can transform the registration of the original image into the registration of its high-frequency sub-images. The correctness of the proposed registration method is proved according to the fast algorithm theory of wavelet decomposition. A four channel nonseparable wavelet filter bank is constructed and the registration steps of the method are given. Experimental results show that the method has better registration results. The amount of computation for computing the registration parameter is less than a quarter of the registration parameters computation of the original image. When compared with registration method based on the tensor product wavelet decomposition,the method has higher registration precision.