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		    Iterative Fitting After Elastic Registration: An Efficient Strategy for Accurate Estimation of Parametric Deformations
- Citation Author(s):
 - Submitted by:
 - Xinxin Zhang
 - Last updated:
 - 14 September 2017 - 5:03am
 - Document Type:
 - Presentation Slides
 - Document Year:
 - 2017
 - Event:
 - Presenters:
 - Xinxin Zhang
 - Paper Code:
 - 3539
 
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We propose an efficient method for image registration based on iteratively fitting a parametric model to the output of an elastic registration. It combines the flexibility of elastic registration - able to estimate complex deformations - with the robustness of parametric registration - able to estimate very large displacement. Our approach is made feasible by using the recent Local All-Pass (LAP) algorithm; a fast and accurate filter-based method for estimating the local deformation between two images. Moreover, at each iteration we
fit a linear parametric model to the local deformation which is equivalent to solving a linear system of equations (very fast and efficient). We use a quadratic polynomial model however the framework can easily be extended to more complicated models. The significant advantage of the proposed method is its robustness to model mis-match (e.g. noise and blurring). Experimental results on synthetic images and real images demonstrate that the proposed algorithm is highly accurate and outperforms a selection of image registration approaches.