Title:
SIGN AUTHENTICATION METHOD
Document Type and Number:
Japanese Patent JP3537963
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a sign authentication method high in precision, robust in the deformation of a size and rotation or the like, and resistant to individual fluctuation due to change in the lapse of time.
SOLUTION: The shape and relative position relation of the strokes of a dictionary-registered character are preliminarily expressed by a dictionary character feature matrix consisting of one or both of the vertical angle of a triangle made by three points selected by a prescribed method on the strokes and the ratio of the lengths of two sides interposing the vertical angle, and an inputted character is expressed by an inputted character characteristic matrix by the similar processing. Then, a distance between the corresponding components of the inputted character feature matrix and the dictionary character feature matrix is calculated by a prescribed method, and when the calculated inter-matrix distance is smaller than a preliminarily defined threshold distance, a person who inputs the inputted character is authenticated as the same person as a person who registers the dictionary registered character. Here, not only an actually written part (pen-down part) but also an unwritten part (pen-up part) are defined as one stroke of the inputted character.
Inventors:
Kajii, Takeshi
Uchiyama, Tadashi
Sonehara, Noboru
Uchiyama, Tadashi
Sonehara, Noboru
Application Number:
JP21997096A
Publication Date:
June 14, 2004
Filing Date:
August 21, 1996
Export Citation:
Assignee:
NIPPON TELEGR & TELEPH CORP <NTT>
International Classes:
G06K9/00; G06T7/00; (IPC1-7): G06T7/00; G06K9/00
Previous Patent: DEVICE AND METHOD FOR GATHERING SOUND
Next Patent: TRANSMITTER FOR IMAGE WITH DESIGNATED RESOLUTION
Next Patent: TRANSMITTER FOR IMAGE WITH DESIGNATED RESOLUTION