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US 11,232,281 B1Granted
Method of filtering fingerprint image
AssigneeHimax Technologies Limited
InventorTsung-Yau Huang
Life of this patent
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Abstract
A method of filtering a fingerprint image is provided. The method includes: receiving an input fingerprint image; preliminarily filtering the input fingerprint image to obtain a preprocessed image; normalizing and then filtering the preprocessed image to obtain a denoised image; filtering and then segmenting the preprocessed image to obtain a background mask; postprocessing the background mask to obtain a final mask; and applying the final mask to the denoised image to obtain an output fingerprint image.
Claims9
A method of filtering a fingerprint image, comprising:
- receiving an input fingerprint image;
- preliminarily filtering the input fingerprint image to obtain a preprocessed image;
- normalizing and then filtering the preprocessed image to obtain a denoised image;
- filtering and then segmenting the preprocessed image to obtain a background mask;
- postprocessing the background mask to obtain a final mask;
- and
- applying the final mask to the denoised image to obtain an output fingerprint image;
- wherein preliminarily filtering the input fingerprint image comprises:
- median filtering the input fingerprint image;
- and
- performing an image denoising process by using a non-local means denoising algorithm to obtain a first image after median filtering the input fingerprint image.
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Dependencies are inferred from the claim text.