Patent ID: 11972632
Assignee: REPUBLIC OF KOREA (NATIONAL SERVICE DIRECTOR MINISTRY OF THE INTERIOR AND SAFETY)
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 3:
4. A fingerprint ridge digital enhancement method comprising:
obtaining a fingerprint image;
dividing an area with ridges and an area without ridges in the fingerprint image, and extracting a pixel value according to a color model for each area;
detecting an outlier of the pixel value according to the color model for each area;
calculating an average and standard deviation of pixel values according to the color model for each area from which the outlier is removed;
setting a parameter that is a criterion for dividing each area, and operating a reference value of the parameter; and
generating and operating a matrix including the pixel value according to the color model of the fingerprint image and the reference value of the parameter,
wherein the generating and operating of the matrix comprises:
generating a matrix M1 (fingerprint image matrix) including the pixel value according to the color model of the fingerprint image;
generating a matrix M2 (reference value matrix) including the reference value of the parameter;
generating an operation matrix X by performing operation based on the fingerprint image matrix M1 and the reference value matrix M2;
integer processing a component of the operation matrix X;
calculating a discriminant value by performing operation based on parameter-related components of the operation matrix X; and
enhancing a ridge of the fingerprint image with a specific color by performing operation based on the discrimination value and a pixel value of the specific color.