To cover a 180° field of view, most surveillance cameras either swivel on remote-­controlled mounts, which means they can miss suspicious activity, or use fish-eye lenses, which can introduce distortions. A new camera stitches images from five inexpensive, fixed sensors--the same kind used in camera phones--into a single, undistorted 180° picture. The Ethernet-connected device is the size of a light switch and transmits video at 15 frames per second, along with a seven-megapixel still image every second or two.

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