An improved text watermarking algorithm for color images

Other Title(s)

خوارزمية محسنة للعلامات المائية النصية في الصور الملونة

Dissertant

al-Daghari, Akram Nasir

Thesis advisor

al-Sawadi, Hamzah Abbas

Comitee Members

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

University

Middle East University

Faculty

Faculty of Information Technology

Department

Computer Science Department

University Country

Jordan

Degree

Master

Degree Date

2017

English Abstract

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

Main Subjects

Information Technology and Computer Science

Topics

• Algorithms
• Watermarks

No. of Pages

94

Table of Contents

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-762667