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Overview of the proposed 3-level bilateral pyramid image registration networks. The bottom-to-top process represents the multi-scale feature extraction of one modality, while the top-to-bottom process corresponds to the feature extraction of another modality. It is built on the basis of LapIRN (27). For clarity and simplicity, we depict the 2D formulation of our method in the figure. CHS, conditional hyperparameter search module; LapIRN, Laplacian pyramid framework; 2D, 2-dimensional.
