Non-contact palmprint authentication method, device and mobile terminal

A non-contact palmprint authentication method, device and mobile terminal, and the method is applied to a mobile terminal including a built in camera and a lighting lamp, including: enabling the built in camera when a palmprint authentication flow is started and keeping the working state of the lighting lamp to be set into a lighting mode when external illumination is insufficient, so as to provide supplementary lighting output for the built in camera; selecting a frame of new image from a video stream outputted by the built in camera as a candidate image, acquiring the current state parameter set of the built in camera according to the candidate image, judging whether each state parameter in the set satisfies a preset standard corresponding to the parameter, and outputting the candidate image as a palmprint-matched contrast palmprint image if all the state parameters satisfy the corresponding preset standards; and, matching the contrast palmprint image with one or more pre-recorded benchmark palmprint images to perform user authentication. The authentication method can effectively improve the output quality of the contrast palmprint image, so as to improve the performance of the non-contact palmprint authentication technology.