To provide a system for detecting a physical object and difference between the physical object and a corresponding reference model.SOLUTION: A system for detecting difference according to the present invention acquires a real world image of a physical object and projects a three-dimensional overlay generated from a reference model on the physical object in the real world image, thereby generating an augmented reality (AR) image. During the generation of the AR image, the system adjusts a posture of the reference model to a posture of the physical object. The system detects difference between the physical object and the reference model based on the generated AR image and the real world image.SELECTED DRAWING: Figure 6A
CHANGE DETECTION METHOD USING AR OVERLAY AND SYSTEM THEREFOR