Digital watermark extraction technique for partially shadowed photos

Conference proceedings article

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Thongkor K., Amornraksa T.

ผู้เผยแพร่: Hindawi

ปีที่เผยแพร่ (ค.ศ.): 2012

หน้าแรก: 290

หน้าสุดท้าย: 295

จำนวนหน้า: 6

ISBN: 9781467311571

นอก: 0146-9428

eISSN: 1745-4557

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84872122341&doi=10.1109%2fISCIT.2012.6380909&partnerID=40&md5=ca1f269cbb269ce58d1d73c7811fbb8e

ภาษา: English-Great Britain (EN-GB)

ดูบนเว็บไซต์ของสำนักพิมพ์

บทคัดย่อ

this paper addresses the difficulty of detecting and/or verifying a watermark signal from watermarked image contained in unauthorized printing media. We consider a situation where an image owner tries to detect his/her embedded watermark from a photo having unauthorized image inside. This taken photo normally contains distortions such as those from the processes of printing and photography resulting in an inaccuracy of the extracted watermark. The situation becomes worse when the image to be detected is partially shadowed by some obstacles. We thus propose in this paper a method to efficiently detect a watermark from a partially shadowed photo. Essentially, an image registration technique base on projective transformation is used to diminish the RST (rotation, scaling, and translation) and perspective distortions from the printing and photography processes. Next, a shadow suppression technique based on gradient field is used to suppress unwanted noise-like shadow before detecting the watermark inside. The experimental results show effectiveness of our proposed method and possibility to implement it in other watermarking schemes. ฉ 2012 IEEE.

คำสำคัญ

gradient field, perspective distortion, printing media, RST distortions, watermarked image