SYSTEM FOR VERIFYING IRIS PATTERN IN REAL-TIME USING VARIABLE THRESHOLD VALUE

摘要

PURPOSE: A system for verifying an iris pattern in real-time using a variable threshold critical value is provided to lower a false accept rate and a false reject rate by applying a different threshold value according to a characteristic of the iris pattern. CONSTITUTION: Some iris images including an iris area are obtained from a user through a camera. An optimal image suitable for iris recognition is selected by examining a quality of the obtained image. The iris area is extracted from the selected image and is processed to the image suitable for characteristic extraction. A characteristic value is extracted from the processed iris image through a transform process. A characteristic vector is generated by quantizing the characteristic value and a similarity between the characteristic vector and the characteristic vector stored in a database is calculated. If the similarity is larger than the threshold value stored in a characteristic code, the iris is verified at the same iris. If not, the iris is rejected.