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Title:
METHOD FOR JUDGING QUALITY OF FINGERPRINT PICTURE
Document Type and Number:
Japanese Patent JPH08110949
Kind Code:
A
Abstract:

PURPOSE: To quickly and simply judge the quality of an inputted fingerprint picture by inputting and binarizing the fingerprint picture and judging the quality of the picture based upon the rate of the area of a binary picture in a prescribed area around the center of gravity of the binary picture.

CONSTITUTION: An inputted fingerprint picture is binarized. The density of the binary picture is projected and intermediate value picture elements on a density projection plan X in X-axis direction and a density projection plan Y in Y-axis direction are calculated to find out the center of gravity GC of the binary picture of the inputted fingerprint picture. Then, the area S of a binary picture in a prescribed area (e.g. a square area) around the center of gravity GC is found out and the rate of the area S of the binary picture to the prescribed area A is calculated. A binary picture of which S/A value is included within a range of 0.4 to 0.55 is judged as fine quality. When the S/A value exceeds the proper value, the binary picture is judged as of defective quality.


Inventors:
NAKAJIMA TATESHI
Application Number:
JP13122693A
Publication Date:
April 30, 1996
Filing Date:
May 07, 1993
Export Citation:
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Assignee:
SHARP KK
EZEL INC
International Classes:
G06T7/60; G06T7/00; (IPC1-7): G06T7/00; G06T7/60
Attorney, Agent or Firm:
Yamamoto Makoto