| Dıgıtal Watermarkıng For Image Sıgnals
Copyright protection of the digital products is one of the problems of digital media. Easy copying and multiplication processes provided by the technology have increased the importance of the problem. Digital images are the products which can be easily modified, copied and duplicated. One of the studies to solve copyright protection on the digital images is to embed some information about the author, production year or logo. This information can be embedded into an image where it can be perceptually either visible or invisible.
In this work, a method is proposed to embed watermarks into the host images invisibly and robust. Discreate Wavelet Transform are used to embed watermark. The resistance of the embedded watermark to image processing attacks can be enhanced by increasing the embedding weight. By permuting the watermark before embedding, the watermark resistance is increased.
After JPEG lossy compression, noise, cropping, scale and rotation attacks the watermarks were extracted. Similarities of the extracted watermarks were measured to determine the resistance against such attacks.
ELMAS Ayfer ,
Danışman :Doç.Dr.Aydın AKAN
Anabilim Dalı :Elektrik – Elektronik Mühendisliği
Mezuniyet Yılı :2006
Tez Savunma Jürisi :Doç.Dr. Aydın AKAN Prof.Dr. Fahri BURUŞUK Prof. Dr. Ayten KUNTMAN Prof.Dr. Ahmet SERTBAŞ Doç.Dr. Hakan Ali ÇIRPAN
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