SYSTEMS AND METHODS FOR COARSE-TO-FINE RIDGE-BASED BIOMETRIC IMAGE ALIGNMENT

摘要

Systems and methods for aligning images are disclosed. A method includes: receiving a first skeletonized biometric image; generating a first coarse representation of the first skeletonized biometric image; identifying a set of candidate transformations that align the first skeletonized biometric image to a second skeletonized biometric image based on comparing transformed versions of the first coarse representation to a second coarse representation of the second skeletonized biometric image; selecting a first candidate transformation as the candidate transformation that minimizes a difference metric between a transformed version of the first skeletonized biometric image and the second skeletonized biometric image; and determining whether the first skeletonized biometric image transformed by the first candidate transformation matches the second skeletonized biometric image, wherein the first skeletonized biometric image transformed by the first candidate transformation matches the second skeletonized biometric image if the difference metric satisfies a threshold.

主权项

1. A processing system, comprising:
a processor; and a memory storing instructions that, when executed by the processor, cause the processing system to align a first image to a second image, wherein the first and second images are biometric images, by performing the steps of:
generating a first orientation map corresponding to the first image;determining a set of candidate transformations that, when applied to the first orientation map, align a transformed version of the first orientation map to a second orientation map corresponding to the second image;for each candidate transformation in the set of candidate transformations:
applying the candidate transformation to the first image to generate a transformed first image, andcalculating a difference metric between the transformed first image and the second image; andselecting a first candidate transformation from the set of candidate transformations that, when applied to the first image, minimizes the difference metric between the transformed first image and the second image.