1. A camera system, comprising: a first camera having a low-resolution image sensor with a plurality of image sensing regions; a plurality of high-resolution cameras, each of the high-resolution cameras associated with a set of the plurality of image sensing regions; and wherein the first camera is configured to detect motion based on sensed images, identify a set of the image sensing regions based on the motion, and power on the high-resolution camera associated with the identified set of image sensing regions.