1. What are the contributions mentioned in the paper "Improved image registration by sparse patch-based deformation estimation" ?
Fortunately, this issue could be alleviated if a good initial deformation can be provided for the two images under registration, which are often termed as the moving subject and the fixed template, respectively.. In this work, the authors present a novel patch-based initial deformation prediction framework for improving the performance of existing registration algorithms.. The authors argue that two image patches should follow the same deformation towards the template image if their patch-wise appearance patterns are similar.. To this end, their framework consists of two stages, i. e., the training stage and the application stage.. In the application stage, the authors apply the following four steps to efficiently calculate the initial deformation field for the new test subject: ( 1 ) they pick a small number of key points in the distinctive regions of the test subject ; ( 2 ) For each key point, they extract a local patch and form a coupled appearance-deformation dictionary from training images where each dictionary atom consists of the image intensity patch as well as their respective local deformations ; ( 3 ) A small set of training image patches in the coupled dictionary are selected to represent the image patch of each subject key point by sparse representation.. Then, the authors can predict the initial deformation for each subject key point by propagating the pre-estimated deformations on the selected training patches with the same sparse representation coefficients.. ( 4 ) the authors employ thin-plate splines ( TPS ) to interpolate a dense initial deformation field by considering all key points as the control points.. This is a PDF file of an unedited manuscript that has been accepted for publication.. As a service to their customers the authors are providing this early version of the manuscript.. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
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