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This paper presents a modified algorithm for colour digital image watermarking. The 24 bits/pixel RGB images are used and the watermark is placed on the green channel of the RGB image. The embedding and extraction processes have been carried out using the discrete cosine transform DCT. Image normalization process has been integrated and used to improve the robustness against geometric attacks. Handwritten...
A new evaluation tool for generating attacks on watermarking algorithms is proposed. The tool is implemented for digital still images but additional attacks for audio or video can be added in the test environment continuously. The implemented tool is comprised of 23 different attacks using a graphical user interface (GUI) to open, select, attack, evaluate, and display the results of both the original...
The increasing number of speeding related car accidents call for stricter measures to be taken. Radio Frequency Identification (RFID) presents the best ability to identify objects in a certain range. A system was created to approximate the speed of a vehicle travelling between two RFID readers. RFID readers will be placed at known, predetermined distances from each other. The passing vehicle carrying...
This paper presents a new copyright protection technique using colour watermarks. The watermark is a RGB colour image where each pixel is represented by 24 bits. The RGB colour watermark is first preprocessed by converting it into binary sequence. The preprocessed colour watermark (binary image) is embedded multi-times into the green channel of the RGB host image by modifying the very low frequency...
This paper deals with a fragile watermarking technique for the authentication of medical images. Medical images are stored in archiving and communication systems that are accessed by the radiologists for diagnosis. The proposed method insure the integrity of the medical image data that is being transferred over public network. Any modification to the watermarked image can be detected using the proposed...
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