Image processing apparatus and method

An image processing method, comprising:

• receiving, by a processor, image information including biometric information;
• extracting, by the processor, from the image information, a first phase component image representing a phase component included in the image information;
• converting, by the processor, the image information into first frequency information, and converting the first phase component image into second frequency information;
• extracting, by the processor, a first feature vector and a second feature vector respectively on the basis of amplitude information of the first frequency information and the second frequency information determined in advance;
• and
• combining, by the processor, the first feature vector and the second feature vector on the basis of a prescribed rule.

A non-transitory computer-readable recording medium having stored therein a program for causing a computer to execute a process comprising:

• receiving image information including biometric information;
• extracting, from the image information, a first phase component image representing a phase component included in the image information;
• converting the image information into first frequency information, and converting the first phase component image into second frequency information;
• extracting a first feature vector and a second feature vector respectively on the basis of amplitude information of the first frequency information and the second frequency information determined in advance;
• and
• combining the first feature vector and the second feature vector on the basis of a prescribed rule.

A biometric authentication apparatus comprising:

• a processor configured to execute a process including:
• receiving image information including biometric information;
• extracting, from the image information, a first phase component image representing a phase component included in the image information;
• converting the image information into first frequency information, and converts the first phase component image into second frequency information;
• extracting a first feature vector and a second feature vector respectively on the basis of amplitude information of the first frequency information and the second frequency information determined in advance;
• combining the first feature vector and the second feature vector on the basis of a prescribed rule;
• and
• performing a comparison collation with a feature vector registered in advance to make a determination as to whether a person is a registered user.

A biometric authentication method comprising:

• receiving, by a processor, image information including biometric information;
• extracting, by the processor, from the image information, a first phase component image representing a phase component included in the image information;
• converting, by the processor, the image information into first frequency information, and also converting the first phase component image into second frequency information;
• extracting, by the processor, a first feature vector and a second feature vector respectively on the basis of amplitude information of the first frequency information and the second frequency information determined in advance;
• combining, by the processor, the first feature vector and the second feature vector on the basis of a prescribed rule;
• and
• performing, by the processor, a comparison collation with a feature vector registered in advance to make a determination as to whether a person is a registered user.