An improved text watermarking algorithm for color images

العناوين الأخرى

خوارزمية محسنة للعلامات المائية النصية في الصور الملونة

مقدم أطروحة جامعية

al-Daghari, Akram Nasir

مشرف أطروحة جامعية

al-Sawadi, Hamzah Abbas

أعضاء اللجنة

al-Mubayyidin, Wisam Abd al-Rahman Muhammad
Abu al-Shurayhah, Ahmad Adil Ahmad

الجامعة

جامعة الشرق الأوسط

الكلية

كلية تكنولوجيا المعلومات

القسم الأكاديمي

قسم علم الحاسوب

دولة الجامعة

الأردن

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2017

الملخص الإنجليزي

Copyright protection and ownership proof of digital multimedia (such as text, audio, images and videos) nowadays are achieved using digital watermarking technique.

This thesis, proposes a text watermarking algorithm for protecting the property rights and ownership judgment of multimedia.

However, it focuses on the process of hiding a small text or owner information in color images.

The embedding process relies on the insertion of the texts elements randomly into the color image as noise, where the randomness is achieved by the use of random number generator that is arranged to be influenced by the image size as well as the text watermark length.

Initially, three color image processing methods; separate color channels, direct conversion to grey and YIQ model, were studied and compared with each other for processing speed first, and the YIQ model was found the fastest, and hence it is adopted for the embedding process.

An optional choice of encrypting the text watermark before embedding is also suggested (in case required by some applications), where, the text can is encrypted using a matrix manipulation method before embedding into images is executed, adding more difficulty to hackers.

Experimental results of applying the proposed algorithm for embedding and extraction of text watermarks of various content combinations and sizes into vast number of images were satisfactory, as they resulted into an improvement of more than double in speed of embedding and extraction than other systems (such as least significant bit method, LSB) and fairly acceptable level of peak signal to noise ratio (PSNR) with low mean square error values, however PSNR deteriorates faster than LBS technique with the watermark text size increases, therefore it is found more suitable for watermarking application, rather than for steganography that is used for secure information exchange purposes

التخصصات الرئيسية

تكنولوجيا المعلومات وعلم الحاسوب

الموضوعات

• الخوارزميات
• العلامات المائية

عدد الصفحات

94

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-762667