第58回研究談話会（Jiying Zhao氏）開催
| テーマ Title |
「RST invariant digital image watermarking and digital watermarking based audiovisual quality evaluation」 |
|---|---|
| 講演者 Speaker |
Jiying Zhao (図書館情報メディア研究科外国人受託研究員) |
| 日時 Date |
平成20年12月16日 (火) 15時15分～16時15分 （質疑込み１時間) |
| 場所 Location |
筑波大学春日キャンパス 情報メディアユニオン３階 共同研究会議室1 |
| 概要 Abstract |
In this presentation, I will introduce digital watermarking, a still very hot research area. Digital watermarking is the science of imperceptibly and robustly embedding additional information into host signals such as image, video, audio, software. The applications of digital watermarking can be copyright protection, content authentication, data hiding, multimedia indexing and retrieval, quality evaluation, etc. Among other requirements, a watermarking algorithm should meet the requirements of imperceptibility, robustness, security, and data capacity. In this presentation I will introduce digital watermarking’s principle, applications, requirements, the state of the art, and challenges. After that, I will report our major achievements in this research area: rotation, scaling, and translation (RST) invariant image watermarking, and image and speech quality evaluation based on watermarking. RST attacks are the most challenging attacks to image watermarking, since even a slight rotation or scaling can defeat a normal watermarking algorithm. We have proposed several novel and practical watermarking algorithms that are invariant to RST. For quality evaluation, I will introduce our algorithms for evaluating the quality of image and speech. Based on discrete wavelet transform and quantization, these quality evaluation algorithms do not need original signal or a complex model, and they are very accurate and promising. We believe that the watermarking based quality evaluation can be extended to audio and video. In conclusion, I will point out the limits of watermarking, the future of watermarking, and the important research challenges in this area. |
| 参加資格 Participation |
事前の申込みは必要ありません。学生，教員，学内外を問わずどなたでも参加ください（無料）。 |
| 資料 Files |
ダウンロード |