Using infrared images of a monitored scene to identify windows

A computing device, comprising:

• one or more processors;
• memory;
• and
• one or more programs stored in the memory configured for execution by the one or more processors, the one or more programs comprising instructions for:
• receiving a captured IR image of a scene taken by a 2-dimensional image sensor array of a camera system while one or more IR illuminators of the camera system are emitting IR light, thereby forming an IR intensity map of the scene with a respective intensity value determined for each pixel of the IR image;
• using the IR intensity map to identify a plurality of pixels whose corresponding intensity values are below a threshold value corresponding to glass;
• clustering the identified plurality of pixels into one or more regions that are substantially contiguous;
• determining that a first region of the one or more regions corresponds to a glass surface based, at least in part, on a difference in area between the first region and a geometrical shape containing the first region being less than a threshold percentage of the geometrical shape's area;
• storing information in the memory that identifies the first region;
• receiving a video stream of the scene from the camera system;
• reviewing the video stream to detect movement in the scene, wherein the first region is excluded from movement detection;
• and
• generating a motion alert when there is motion detected at the scene outside of the first region.

A non-transitory computer readable storage medium storing one or more programs configured for execution by a computing device having one or more processors and memory, the one or more programs comprising instructions for:

• receiving a captured IR image of a scene taken by a 2-dimensional image sensor array of a camera system while one or more IR illuminators of the camera system are emitting IR light, thereby forming an IR intensity map of the scene with a respective intensity value determined for each pixel of the IR image;
• using the IR intensity map to identify a plurality of pixels whose corresponding intensity values are below a threshold value corresponding to glass;
• clustering the identified plurality of pixels into one or more regions that are substantially contiguous;
• determining that a first region of the one or more regions corresponds to a glass surface based, at least in part, on a difference in area between the first region and a geometrical shape containing the first region being less than a threshold percentage of the geometrical shape's area;
• storing information in the memory that identifies the first region;
• receiving a video stream of the scene from the camera system;
• reviewing the video stream to detect movement in the scene, wherein the first region is excluded from movement detection;
• and
• generating a motion alert when there is motion detected at the scene outside of the first region.