The invention provides a middle and long distance identity authentication method and device based on multi-mode biological feature recognition, and the method comprises the steps: firstly, shooting a scene picture based on a visible light scene camera, detecting a user, further adjusting the angles of a binocular depth camera, an infrared iris camera and a light supplement lamp module to face the to-be-authenticated user according to the position of the to-be-authenticated user in the scene picture. The distance of the to-be-authenticated user is detected based on the binocular depth camera, the angle and the focal length of the infrared iris camera are adjusted according to the distance, and the angle and the brightness of the light supplementing lamp module are adjusted according to the distance, so that a high-definition face image and a high-definition iris image are shot. Face features and iris features are respectively extracted based on the face image and the iris image and fused for identity authentication, so that the recognition accuracy is greatly improved. According to the device, the distance of the to-be-authenticated user is determined through the binocular depth camera, the angle and the focal length of the infrared iris camera are adjusted based on the position and the distance of the to-be-authenticated user, and a clearer face image and a clearer iris image can be obtained.
Middle and long distance identity authentication method and device based on multi-mode biological feature recognition