Patent ID: 8837931

Claim:
A method, performed by a monitoring device, comprising: detecting, by the monitoring device, a temperature change, greater than a temperature change threshold, from a previous temperature to a current temperature; retrieving, by the monitoring device, a trend-based motor position setting for a focus motor from a trend statistics memory based on the current temperature; selecting, by the monitoring device, a starting motor position setting for the focus motor based on the retrieved trend-based motor position setting or a current motor position setting; performing, by the monitoring device, a just noticeable difference modification on the focus motor from the selected starting motor position setting, wherein the just noticeable difference corresponds to a smallest number of steps in a motor position setting that results in a perceivable change in a focus level of images captured by the monitoring device; and selecting, by the monitoring device, a temperature adjusted motor position setting for the focus motor based on a result of the just noticeable difference modification.