Patent EP0737932B1 successfully refreshed from Google Patents.
EP0737932B1
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An apparatus for extracting skin pattern features and a skin pattern image processor
Assignee: NEC Corp
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Filing: 1996-04-12
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Granted: 2002-03-20
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Expires: 2016-04-12
Abstract
No abstract record available.
Inventors
- 👤 Toshio Kamei
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:06
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/12; G06V40/1347
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
235 words
An apparatus for extracting features of predetermined subregions
of a skin pattern image, comprising: an image memory (11) for storing image data of the skin pattern
image; a filter file (15) for storing a plurality of filters consisting of two-dimensional
data prepared according to the features to be extracted; filtering means (12) for outputting filtered data sets, each of said
filtered data sets obtained from said image data by convolution
calculation with each of said plurality of filters; image intensity calculation means (13) for calculating image intensity
of each of the predetermined subregions of each of said
filtered data sets; and feature extracting means (14) for determining the features of the
predetermined subregions of the skin pattern image referring
to said image intensity of each of the predetermined subregions
of each of said filtered data sets, wherein said feature extracting means (14) determine the features of the
predetermined subregions of the skin pattern image according
to feature parameters minimizing an evaluation function, said
evaluation function being a linear function of said image intensity
of each of the subregions of one of said filtered data sets
corresponding to a feature parameter assigined to said each of
the subregions, and a value corresponding to singularity of said
feature parameter assigned to said each of the predetermined
subregions compared to the feature parameters assigned to certain
of the predetermined subregions neighbouring to said each
of the predetermined subregions.
Claim 2
Independent Claim
257 words
An apparatus for extracting features of predetermined
subregions of a skin pattern image, comprising: an image memory (11) for storing image data of the skin pattern
image; a filter file (15) for storing a plurality of filters consisting of two-dimensional
data prepared according to the features to be extracted; filtering means (24) for outputting filtered data sets, each of said
filtered data sets being an inverse Fourier transform of a masked
data set obtained from a Fourier transform of said image data
by product calculation of each frequency component of said
Fourier transform and each of said plurality of filters; image intensity calculation means (13) for calculating image intensity
of each of the predetermined subregions of each of said
filtered data sets; and feature extracting means (14) for determining the features of the
predetermined subregions of the skin pattern image referring
to said image intensity of each of the predetermined subregions
of each of said filtered data sets, wherein said feature extracting means (14) determine the features of the
predetermined subregions of the skin pattern image according
to feature parameters minimizing an evaluation function, said
evaluation function being a linear function of said image intensity
of each of the subregions of one of said filtered data sets
corresponding to a feature parameter assigined to said each of
the subregions, and a value corresponding to singularity of said
feature parameter assigned to said each of the predetermined
subregions compared to the feature parameters assigned to certain
of the predetermined subregions neighbouring to said each
of the predetermined subregions.
Claim 3
Dependent Claim
55 words
An apparatus according to claim 1 or 2, further
comprising pixel value calculating means for calculating a
value of each pixel of the filtered skin pattern image from
values of pixels of
those of
said filtered data sets that correspond to each of the
features extracted of the predetermined subregions where
said each pixel belongs.
References Cited (Backward Citations)
No citation records indexed.
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