公开(公告)号：US20240397167A1

公开(公告)日：2024-11-28

申请号：US18344065

申请日：2023-06-29

Applicant: Korea Electronics Technology Institute

Inventor： Ji Soo HONG ,  Sung Hee HONG ,  Young Min KIM ,  Jin Soo JEONG ,  Yong Hwa KIM ,  Byoung Hyo LEE ,  Hyeon Chan OH

IPC: H04N21/8358 ,  H04N21/234 ,  H04N21/239 ,  H04N21/24

Abstract: There is provided an object attribute-based watermarking method for preventing leakage of a digital content. A video watermarking method according to an embodiment may acquire a requested video and watermarking information upon receiving a request for video streaming from a user, may determine some of objects appearing in the video according to the watermarking information, may transform attributes of the determined objects, and may stream the transformed video. Accordingly, by watermarking an attribute of an object appearing in a video differently according to a user and providing the video, a watermark may be difficult to perceive, robustness against various attacks may be guaranteed, and a leakage path of a content may be checked.

公开(公告)号：US20240393509A1

公开(公告)日：2024-11-28

申请号：US18343886

申请日：2023-06-29

Applicant: Korea Electronics Technology Institute

Inventor： Ji Soo HONG ,  Sung Hee HONG ,  Young Min KIM ,  Jin Soo JEONG ,  Yong Hwa KIM ,  Byoung Hyo LEE ,  Hyeon Chan OH

IPC: G02B5/124 ,  G02B27/09

Abstract: There is provided a thin optical system for real-world occlusion in an augmented reality display. The optical system according to an embodiment includes: a first DCRA configured to reflect light beams focused on holes; a mask positioned on a light emitting surface of the first DCRA to pass or block the light beams emitted from the first DCRA; and a second DCRA configured to reflect the light beams which are focused on holes after passing through the mask. Accordingly, the optical system can implement real-world occlusion in the unit of pixel while having a thin form factor.