A camera system includes a first camera having a low-resolution image sensor with a plurality of image sensing regions. The camera system includes a plurality of high-resolution cameras. Each of the high-resolution cameras is associated with a set of the plurality of image sensing regions. 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.