Patent Document ID: 10062006
Application ID: 15171061
Patent Status: 1

Claim One:
1. An apparatus comprising: a sensor configured to photograph a current image frame; a memory configured to store a background image frame; and a processor configured to obtain a first difference image and a second difference image from the currently photographed image frame, to identify an existence of an object and a position of the object using the first and the second difference images, wherein the processor is further configured to obtain the first difference image by comparing a difference between corresponding grey scale values of the currently photographed image frame and a previously photographed image frame with a threshold value, wherein the processor is further configured to obtain the second difference image by comparing a difference between corresponding grey scale values of the currently photographed image frame and the background image frame stored in the memory with the threshold value, wherein the processor is further configured to, if a first condition and a second condition are satisfied, update the background image frame to the currently photographed image frame, wherein the first condition is a condition that an area representing a pixel difference between frames does not exist in the first difference image but exists in the second difference image, and wherein the second condition is a condition that a difference in the area between a previously-obtained first difference image corresponding to the previously photographed image frame and the second difference image corresponding to the currently photographed image frame is equal to or greater than a predetermined value.