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Registration

Registration is a fundamental part of computer vision. It is the process of aligning two datasets taken from different coordinate systems. The datasets can be images, in which case registration is performed in 2-D, or they can be 3-D models or point clouds, in which case registration is performed in 3-D. Depending on the task, the estimated transformation can be a simple translation or a complicated nonrigid deformation. A well-known use for registration is in the panorama-making software of consumer cameras, where several images of the scene are stitched together to produce a larger, panoramic image. Registration is used to estimate the relative position of the images and align the overlapping areas.

Registration can be formulated as finding the best transformation that aligns the two datasets. The transformation is applied to the coordinates of the image. In many cases, it is practical to represent the transformation in homogeneous coordinates by a matrix multiplication as follows:
p' = Tp


  

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