Method and system for automatic identification using digital images
The present invention provides a method for automatically identifying a person comprises acquiring white-light and UV images of a portion of the person's skin, generating a skin mask from the white-light image, and comparing the skin mask with a pre-stored skin mask of the person. If a substantial match is not found between the two skin masks, the person is not identified, and an error message such as “wrong person” or “person unknown” is returned. Otherwise, the method proceeds to obtain results associated with certain skin conditions using at least the UV image. The results are compared with pre-stored results to determine if the person is the right person or wrong person. A computer readable medium and system are also disclosed.
1. A system for automatic identifying a person using digital images, comprising:
an image acquisition device configured to acquire a white-light image and a UV image of a portion of a body surface of the person, each of the white-light and UV images having a plurality of pixels, each pixel in the UV image corresponding to a respective pixel in the white-light image;
a computer system configured to identify, on a pixel by pixel basis, skin-pixels in the white-light and UV images, and to obtain results associated with at least one skin condition using information in at least the UV image, the at least one skin condition including subsurface skin condition; and
a database storing skin condition data including subsurface skin condition data associated with a known person;
wherein the computer system is further configured to compare the obtained results with the stored skin condition results to determine if the person to be identified is the known person.
2. The system of claim 1 , wherein the image acquisition device has a sensor that can be rotated to adjust an aspect ratio of the white-light or UV image according control signals from the computer system.
3. The system of claim 1 , wherein the image acquisition device comprises:
a sensor;
an optical assembly configured to form images of the subject on the sensor; and
a plurality of flash light sources attached thereto, including two flash light sources on two sides of the optical assembly, and one on top of the optical assembly, at least a portion of the flash light sources have UV transmission filters installed thereon, and at least a portion of the flash light sources have infrared absorption filters installed thereon.