Cameras can be used to detect if unauthorized visitors enter pool areas. Cameras can send alerts to remote computing devices regarding unauthorized pool entry. Several embodiments include using a camera to take an image of a pool area, sending the image from the camera to a remote computing device, displaying the image on the remote computing device, and using the remote computing device to select a detection zone. Some embodiments include ignoring certain portions of the camera's field of view in response to detection zone selections.