Patent ID: 7342611
Filing Date: 2008-03-11
Classification: H04N

Abstract:
1. A camera comprising: a power switch; a display; an imaging system comprising an image sensor; a volatile storage device; a power switch monitoring component; processing circuitry coupled to the power switch, display, image sensor, volatile storage device and power switch monitoring component; and a processing algorithm that runs on the processing circuitry that implements a warm-sleep sequence that, if the camera is on: detects activation of the power switch; places the volatile storage device into a low-power self-sustaining state; turns off power to all components except the volatile storage device and power switch monitoring component; instructs the processing circuitry to enter a low power consumption halt state, which puts the camera in a warm-sleep state; detects activation of the power switch or reaches a pre-configured timeout of the power switch monitoring component; wakes up the processing circuitry to bring it out of the halt state and continues operation of its firmware at the next instruction; evaluates the cause of wakeup; if the cause is a result of the preconfigured timeout, executes a full power-down sequence and shuts down all power supplies except the processing circuitry to enter a cold power-down state; and if the wakeup cause is a result of power switch activation, configures the volatile storage device to be refreshed by the processing circuitry and activates power busses to fully power the processing circuitry and other necessary components.