2-D interactive nonrigid image
registration
Image Fusion Systems Research   cs@imgfsr.com         
With interactive registration the user can evaluate the registration accuracy and interactively revise the results. Landmark selection and
correspondence are achieved interactively with limited help from the computer. For instance, the user selects corresponding landmarks
in the images with the mouse and asks the computer to refine the correspondences via template matching. The user then reviews the
refined correspondences, and removes the inaccurate ones. After finding a transformation function from the correspondences and
superimposing the images, if the registration is found not sufficiently accurate, further landmarks are selected and the process is
repeated until desired registration accuracy is reached.  Normally, sufficient accuracy can be achieved within a few minutes.

An example of interactive image registration is given below. The top row depicts two images of a terrain scene from up close. Initially,
the user may select a few corresponding landmarks in the images with the click of the mouse (second row) and register the images as
depicted in third row. The user can further select corresponding landmarks in areas that are thought to be inaccurate (fourth row) and
repeat the process to improve the registration (bottom row).
Fig. 1. (Top row) A pair of images of a terrain scene from up close. (Second row) Three corresponding landmarks are interactively
selected in the images and refined automatically. (Third row) Registration of the images using the three correspondences. (Fourth
row) Interactive selection of additional landmarks and refinement of the correspondences automatically. (Bottom row) Registration of
the images using the new set of correspondences and surface spline transformation.
To obtain a license for this image registration software, follow this link =>