Figure 1

Procedure to generate ground truth deformation field. Illustration of reconstructed procedure to generate moving image (left) and corresponding ground truth deformation field (right) for “Ball” example. Based on careful inspection of the images provided to us, we determined that the top-left area of the fixed image had been copied and shifted to the right by 50 pixels. Thus, the ground truth deformation field comprises four distinct regions as shown on the right. The “moving” and “fixed” images were kindly provided by C. Xing and are reproduced with permission from IEEE (see Acknowledgements).