Systems and methods for presence detection

Abstract

Systems and methods are provided for presence detection using an image system. The image system may be a camera that is integrated into an electronic device. In some embodiments, the image system can accommodate multiple operating modes of the electronic device. For example, when the electronic device is operating in a normal power mode, control circuitry of the image system can detect when a user has left and is no longer using the electronic device. When the electronic device is operating in a power saving mode, the control circuitry can detect user presence (e.g., when a user has come back to the electronic device). In some embodiments, the control circuitry can adjust for both gradual and sudden light changes.

1 . A method of performing presence detection, the method comprising:
 selecting a first image frame as a reference frame, wherein the reference frame is divided into a first grid of zones, and wherein the first grid of zones is associated with a set of reference luminance values;   selecting a second image frame as a current frame, wherein the current frame is divided into a second grid of zones, and wherein the second grid of zones is associated with a set of current luminance values;   calculating a set of parameters between the set of reference luminance values and the set of current luminance values;   determining that at least one of the set of parameters satisfies a pre-determined threshold; and   in response to the determining, switching an operating mode of an electronic device.   
     
     
         2 .- 29 . (canceled)