Patent ID: 7634113

Claim:
A user recognizing system for determining a predetermined user based on a user image, comprising: a user information database including user ID and corresponding user feature information; an image input unit for digitalizing the user image into user image data and transmitting the digitalized user image data into the system; a feature recognizing unit for extracting first user feature being absolutely unique biometric information and second user feature information being unique semibiometric information under a predetermined condition from the user image data transmitted from the image input unit, and respectively generating a first probability and a second probability that the extracted first and second user feature information determine the predetermined user based on the information stored in the user information database; and a user determination unit for finally determining a user ID of the user image by combining the first probability and the second probability, wherein the feature recognizing unit includes a first feature recognizing unit for generating the first probability based on factors including whether extracting the first user feature satisfied a standard of the feature recognizing unit and a second feature recognizing unit for generating the second probability based on factors including differences in semibiometric information among all users of a predetermined user group, wherein the first probability or the second probability is given as follows: P X , Ui = P X , Ui ′ ∑ k = 1 N ⁢ P X , Uk ′ , ⁢ if ⁢ ⁢ only ⁢ ⁢ P ⁡ ( x ) = 1 σ ⁢ 2 ⁢ π ⁢ ⅇ - ( x - X f ) 2 / ( 2 ⁢ σ 2 ) , ⁢ μ < X i , P X , Ui ′ = 0.5 - ∫ μ Xi ⁢ P ⁡ ( x ) ⁢ ⁢ ⅆ x , ⁢ μ = X i , P X , Ui ′ = 0.5 , ⁢ μ > X i , P X , Ui ′ = 0.5 + ∫ Xi μ ⁢ P ⁡ ( x ) ⁢ ⁢ ⅆ x , where U i is a predetermined user i, X i is an X feature value of the predetermined user i, P X,Ui is a probability that the measured X feature value corresponds to the predetermined user i, X is the first feature or the second feature, μ is the measured result of the first feature or the second feature, N is a total user number within a predetermined user group.