Developing a robust digital image watermark by using frequency and spatial domains

العناوين الأخرى

تطوير علامة مائية صلدة للصور الرقمية باستخدام المجالين الترددي و المكاني

مقدم أطروحة جامعية

Hassan, Wisam Ahmad

مشرف أطروحة جامعية

al-Hamami, Ala Husayn

أعضاء اللجنة

Rawashidah, Adnan
Kasasibah, Basil

الجامعة

جامعة عمان العربية

الكلية

كلية العلوم الحاسوبية و المعلوماتية

القسم الأكاديمي

قسم علم الحاسوب

دولة الجامعة

الأردن

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2010

الملخص الإنجليزي

The rapid growth of the internet, and the speed of file transfers caused the digitalization of media assets, so many illegal copies of images, music titles, and video films appeared.

As a countermeasure mechanism; digital watermarking took its role to protect these digital assets and associated rights.

In this thesis a new approach is presented for private digital image watermarking, the meaning of private, here, is the images that could not be found on public resources like Internet.

It combines two domains for watermark embedding, the frequency domain particularly Discrete Wavelet Transform (DWT), and the spatial domain particularly Least Significant Bit (LSB).

The proposed watermarking algorithm operates in the Discrete Wavelet Transform (DWT) to separate the image into a lower resolution approximation image (LL1) as well as Horizontal (HL1), Vertical (LH1) and Diagonal (HH1) detail components.

The process can then be repeated to compute multiple “scale” wavelet decomposition.

Specific coefficients from the vertical detail components are selected and transformed to binary code then the system picks one of the least significant bits for each number according to the number of ones in the most significant part and replace it with one bit from the watermark message.

Then the Inverse Discrete Wavelet Transform (IDWT) is applied to the transformed image to obtain the watermarked image.

This algorithm has been tried against many attacks like lossy compression, noise addition, cropping, and some other attacks against its robustness.

It achieved a high success of increasing robustness of the proposed watermark, with little or no additional impact on image quality.

التخصصات الرئيسية

الهندسة الكهربائية

الموضوعات

• الإلكترونيات الرقمية
• الصور الرقمية

عدد الصفحات

94

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-526513