Patent ID: 8194127
Filing Date: 2012-06-05
Classification: G06T,G08B

Abstract:
1. A method for masking a surveillance image taken with a camera, comprising: (a) setting a masking zone corresponding to a protection area on a video frame being taken with the camera and obtaining initial video data from the set masking zone; (b) after a predetermined time, determining whether the masking zone is deviated from the protection area by calculating a correlation between the initial video data and video data obtained from the masking zone, wherein the correlation is calculated using high-frequency components of luminance signals of the initial video data and the video data obtained from the masking zone; and (c) adjusting a position of the masking zone on the video frame, if it is determined that the masking zone is deviated, by repeatedly searching a new masking zone on the video frame until the correlation between the initial video data and video data obtained from the new masking zone is less than a predetermined limit, wherein the new masking zone is obtained by moving the previous masking zone by a predetermined distance, wherein steps (b) and (c) are performed periodically, and wherein the correlation is a value determined based on: