PORTABLE DEVICE USING PASSIVE SENSOR FOR INITIATING TOUCHLESS GESTURE CONTROL

摘要

A portable device (100) comprising a controller (210), a memory (240), a camera (160) and a passive proximity sensor (170). The controller being configured for receiving input from said passive proximity sensor (170) indicating a light environment in front of the passive proximity sensor (170) detecting a change in light environment, determining a light pattern (P) of changes in light environment, determining if the light pattern (P) matches a stored initiating pattern, which is stored in the memory (240), and if so, accepting the light pattern (P) and in response thereto activating the camera (160), identifying an object (H) in front of the camera (160) and tracking the object (H) thereby enabling touchless gesture control of the portable device (100), characterized in that the passive proximity sensor is an ambient light sensor and the light pattern consists of a series of changes between dark and light (dark is light below a threshold, light is light above a second threshold).