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JPS6461870A - Method for detecting crack distribution of ridge line of fingerprint image - Google Patents

Method for detecting crack distribution of ridge line of fingerprint image

Info

Publication number
JPS6461870A
JPS6461870A JP62219868A JP21986887A JPS6461870A JP S6461870 A JPS6461870 A JP S6461870A JP 62219868 A JP62219868 A JP 62219868A JP 21986887 A JP21986887 A JP 21986887A JP S6461870 A JPS6461870 A JP S6461870A
Authority
JP
Japan
Prior art keywords
circuit
squares
detected
fingerprint image
ridge line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62219868A
Other languages
Japanese (ja)
Inventor
Hironori Yahagi
Seigo Igaki
Hiroyuki Ikeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP62219868A priority Critical patent/JPS6461870A/en
Publication of JPS6461870A publication Critical patent/JPS6461870A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1347—Preprocessing; Feature extraction

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Analysis (AREA)
  • Collating Specific Patterns (AREA)

Abstract

PURPOSE:To ensure the accurate positioning jobs of fingerprint images over a wide range by detecting a square containing an end point from the contour of a ridge line detected through tracking of the changing point of the picture element of a fingerprint image obtaining both directions of the crack and the ridge line through a simple arithmetic operation, and performing the collation of fingerprints based on said crack and line directions. CONSTITUTION:A fingerprint image supplied from a picture input part 21 is turned into a binarized image 1 by a binarizing circuit 22. The image 1 is divided into the grid-shaped squares 2 and supplied to a contour extracting circuit 25. Then each square 2 is scanned for detection of the changing points 3 of the picture element value and the contours 8 of the ridge lines 7. Then the picture elements of the contours 8 detected by an end point detecting circuit 23 are selected equidistantly and these picture elements are connected to each other for production of two vectors. The inner lines of these vectors are calculated for detection of all end points. An independent point erasing circuit 24 paints out the squares 2 containing end points and stores these squares. Furthermore a directional distribution calculation circuit 26 calculates the directional vector of the line 7 in case an area 5 including cracks is not detected. Then a positioning circuit 29 and a deciding circuit 27 work to perform each processing.
JP62219868A 1987-09-01 1987-09-01 Method for detecting crack distribution of ridge line of fingerprint image Pending JPS6461870A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62219868A JPS6461870A (en) 1987-09-01 1987-09-01 Method for detecting crack distribution of ridge line of fingerprint image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62219868A JPS6461870A (en) 1987-09-01 1987-09-01 Method for detecting crack distribution of ridge line of fingerprint image

Publications (1)

Publication Number Publication Date
JPS6461870A true JPS6461870A (en) 1989-03-08

Family

ID=16742313

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62219868A Pending JPS6461870A (en) 1987-09-01 1987-09-01 Method for detecting crack distribution of ridge line of fingerprint image

Country Status (1)

Country Link
JP (1) JPS6461870A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0818929A2 (en) * 1996-07-11 1998-01-14 Daewoo Electronics Co., Ltd Method and apparatus for encoding a contour image in a video signal
WO2018151646A1 (en) * 2017-02-17 2018-08-23 Fingerprint Cards Ab Enabling identification of fingerprints from captured images using contour points

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0818929A2 (en) * 1996-07-11 1998-01-14 Daewoo Electronics Co., Ltd Method and apparatus for encoding a contour image in a video signal
EP0818929A3 (en) * 1996-07-11 2000-08-23 Daewoo Electronics Co., Ltd Method and apparatus for encoding a contour image in a video signal
WO2018151646A1 (en) * 2017-02-17 2018-08-23 Fingerprint Cards Ab Enabling identification of fingerprints from captured images using contour points

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