1. A method of personal identification, the method comprising: switching between visible and near infrared light; acquiring palmprint image and palm vein image from a person under the visible and the near infrared light; extracting a palmprint sub-image from the palmprint image, and a palm vein sub-image from the palm vein image, the palmprint sub-image and the palm vein sub-image are based on a common region of interest; extracting palmprint features from the palmprint sub-image, and extracting palm vein features from the palm vein sub-image using a matched filter technique; and matching the extracted palmprint features and palm vein features with stored information in a database to authenticate the person.