The most common used traits include face, fingerprint, hand geometry, retina, iris, voice, signature and so on.Compare with these traits, palmprint is seldom considered.

• 常用的人体生物特征有脸形、指纹、掌形、视网膜、虹膜、语音和数字签名等，其中掌纹识别技术的研究起步较晚。