| 发明名称 | Trend-based temperature compensation for a monitoring device | ||
| 摘要 | A method, performed by a monitoring device, may include detecting a temperature change, greater than a temperature change threshold, from a previous temperature to a current temperature; retrieving a trend-based motor position setting for a focus motor from a trend statistics memory based on the current temperature; and selecting a starting motor position setting for the focus motor based on the retrieved trend-based motor position setting or a current motor position setting. The method may further include performing a just noticeable difference modification on the focus motor using the selected starting motor position setting, wherein the just noticeable difference corresponds to a change in a motor position setting that results in a perceivable change in a focus level of the monitoring device, and selecting a temperature adjusted motor position setting for the focus motor based on a result of the just noticeable difference modification. | ||
| 申请公布号 | US8837931(B2) | 申请公布日期 | 2014.09.16 |
| 申请号 | US201213630092 | 申请日期 | 2012.09.28 |
| 申请人 | Axis AB | 发明人 | Gredegård Henning;Östby Björn |
| 分类号 | G03B13/00;G02B7/02 | 主分类号 | G03B13/00 |
| 代理机构 | Snyder, Clark, Lesch & Chung, LLP | 代理人 | Snyder, Clark, Lesch & Chung, LLP |
| 主权项 | 1. 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. | ||
| 地址 | Lund SE | ||