Method of validation of the use of a real finger as support of a fingerprint
US-9471827-B2 · Oct 18, 2016 · US
Ridge direction extraction device, ridge direction extraction method, and ridge direction extraction program
US9014437B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9014437-B2 |
| Application number | US-201214240659-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 7, 2012 |
| Priority date | Aug 23, 2011 |
| Publication date | Apr 21, 2015 |
| Grant date | Apr 21, 2015 |
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Abstract
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A ridge direction extraction unit, which analyzes the shape of a ridge in a fingerprint image and extracts the ridge direction that indicates the slope of the ridge, includes: a low confidence region density value conversion module that reduces the density values in a low confidence region to generate a density conversion image; a synthesized image generating module for synthesizing a high confidence region and the low confidence region to generate a synthesized image; an auxiliary direction determining function for determining which ridge direction in the synthesized image is to be the auxiliary direction and deriving the degree of confidence in the auxiliary direction; and a high confidence region expanding module for calculating the degree of confidence in the direction, and correcting the ridge direction in the low confidence direction contiguous with the high confidence region so as to increase the degree of confidence in the ridge direction.
First claim
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The invention claimed is: 1. A ridge direction extraction device, comprising a ridge direction extraction unit which performs extraction of a ridge direction showing a slope direction of the ridge by analyzing shape of the ridge within a fingerprint image, wherein the ridge direction extraction unit comprises: a ridge direction determining module which determines the ridge direction as a main direction through evaluating a density difference between a target region set on the ridg…
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- G06K9/0008Primary
Physics · mapped topic
- G06V40/1359Primary
Physics · mapped topic
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- What does patent US9014437B2 cover?
- A ridge direction extraction unit, which analyzes the shape of a ridge in a fingerprint image and extracts the ridge direction that indicates the slope of the ridge, includes: a low confidence region density value conversion module that reduces the density values in a low confidence region to generate a density conversion image; a synthesized image generating module for synthesizing a high conf…
- Who is the assignee on this patent?
- Hara Masanori, Nec Corp
- What technology area does this patent fall under?
- Primary CPC classification G06K9/0008. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Apr 21 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).