The disclosure provides a network device, an image processing method, and a computer readable medium. The method includes: receiving a video stream from an IP camera; detecting whether a predetermined motion event occurs in the video stream according to a designated motion detection mode; in response to the predetermined motion event is detected, generating an event mark corresponding to the predetermined motion event and extracting a video clip corresponding to the predetermined motion event from the video stream; determining whether a video content satisfying a notification condition exists in the video clip; and in response to the video content satisfying the notification condition, sending the event mark and the video content to a smart device accessing the network device.