Image watermark extraction for captured image with partially glass reflection
Conference proceedings article
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
ไม่พบข้อมูลที่เกี่ยวข้อง
รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: Thongkor K., Amornraksa T.
ผู้เผยแพร่: Hindawi
ปีที่เผยแพร่ (ค.ศ.): 2013
ISBN: 9781479905454
นอก: 0146-9428
eISSN: 1745-4557
ภาษา: English-Great Britain (EN-GB)
บทคัดย่อ
This paper addresses a problem of detecting watermark signal from watermarked printed image behind a glassy object. By considering a situation where an image owner tries to extract his/her embedded watermark from a camera-captured image having unauthorized image inside, such image will always include RST (rotation, scaling, and translation) and perspective distortions from the processes of printing and camera-capturing, which consequently affect the accuracy of the extracted watermark. The situation becomes worse when the image is captured through the glassy object, and some lights reflect off the glass surface. In this paper, we thus propose a method to extract a watermark from a camera-captured image contained partially glass reflection. Basically, the image alignment technique based on projective transformation is applied to diminish both RST and perspective distortions due to printing and camera-capturing processes. Next, undesirable reflection reduction technique based on gradient field is introduced to reduce unwanted reflection in the camera-captured image, before performing the watermark estimation sub process. The experimental results show effectiveness of our proposed method and possibility to implement it in other watermarking schemes. ฉ 2013 IEEE.
คำสำคัญ
glassy object, RST and perspective distortions
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