FINGERPRINT COLLATION DEVICE - Mitsubishi Electric Corporation

Title:

FINGERPRINT COLLATION DEVICE

Document Type and Number:

Japanese Patent JP3695899

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To attain sure and stable finger placing discrimination without mis- discrimination by extracting a characteristic only when a finger placing discrimination means discriminates a finger placed state and collating finger data with registration data.
SOLUTION: An image input means 11 receives an image, a finger placing discrimination means 12 applies binarization processing to the image to divide the input image into a block consisting of 16×16 pixels, binarizes a contrast image by using a mean density of each block as a threshold level so as to discriminate whether or not a skin edge line in each block is made stable. In the case that many blocks are discriminated for finger placing, it is discriminated that a finger is placed and a characteristic discrimination means 13 is used to correct intermission or connection of a skin edge line by skin edge direction calculation processing and contrast image correction processing. A collation means 14 is used to calculate a degree of skin edge directions and a degree of coincidence of characteristic points thereby calculating how much the characteristic point is coincident with a characteristic point of a concerned person registered in advance. When the coincidence of the skin edge direction is smaller than a preset threshold level and when the coincidence of the characteristic point is larger than other threshold level, the concerned person is authenticated.

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Inventors:

Hideto Fujiwara
Shinichi Kuroda

Application Number:

JP14675897A

Publication Date:

September 14, 2005

Filing Date:

June 04, 1997

Export Citation:

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Assignee:

Mitsubishi Electric Corporation

International Classes:

G06K9/00; G06T7/00; (IPC1-7): G06T7/00

Domestic Patent References:

JP1320587A
JP4186485A
JP7146940A
JP1211184A
JP63262767A

Attorney, Agent or Firm:

Michiteru Soga
Yoshio Kobayashi
Yutaka Ikeya
Hidetoshi Furukawa
Suzuki Kenchi
Masahisa Hase
Tetsuo Kuroiwa

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