Mobile information terminal and gripping-feature authentication method

摘要

A mobile information terminal including a gripping-feature sample acquisition unit to acquire a gripping-feature sample, one or more environmental sensors outputting an environmental signal, a terminal status detector to acquire the environmental signal and detect a terminal status, a template selection unit to select a user authentication template fitting the detected terminal status, a user authentication unit collating the acquired gripping-feature sample with the selected user authentication template and outputting a user authentication result, a user authenticity level monitor that outputs a sensor power source OFF signal when the user authenticity level exceeds a threshold value and outputs a sensor power source ON signal when the user authenticity level falls below the threshold value, and a power source control unit halting energization to a sensor when acquiring the sensor power source OFF signal, and energizing a sensor when acquiring the sensor power source ON signal.

主权项

1. A mobile information terminal that acquires a gripping-feature sample when the mobile information terminal is gripped, so as to perform user authentication, comprising:
a gripping-feature sample acquisition unit, implemented by circuitry, configured to acquire the gripping-feature sample; an environmental sensor group that includes one or more sensors that acquire environmental information on an environment to which the mobile information terminal belongs and output an environmental signal; a terminal status detection unit, implemented by the circuitry, configured to acquire the environmental signal and detect one or more combinations of terminal statuses of the mobile information terminal as environmental states; a template storage memory configured to store a user authentication template that fits to each of the environmental states; a template selection unit, implemented by the circuitry, configured to acquire the environmental state that is detected, so as to select a user authentication template that fits to the corresponding environmental state; a user authentication unit, implemented by the circuitry, configured to perform the user authentication by collating the gripping-feature sample that is acquired with the user authentication template that is selected, and output a corresponding user authentication result; a user authenticity level monitoring unit, implemented by the circuitry, configured to acquire the user authentication result, output a sensor power source OFF signal when a user authenticity level, which varies in accordance with the user authentication result, varies to exceed a threshold value that is predetermined to correspond to each sensor, and output a sensor power source ON signal when the user authenticity level varies to fall below the threshold value; and a power source control unit, implemented by the circuitry, configured to halt energization to a sensor that corresponds to the threshold value when the power source control unit acquires the sensor power source OFF signal, and energize a sensor that corresponds to the threshold value when the power source control unit acquires the sensor power source ON signal.