Investigation of the effects on embedded watermarks under image manipulations

Abstract: In this paper, different types of image watermarking techniques, the embedding of data or copyright information into the data file, are investigated. Three image watermarking techniques are discussed, namely: least significant bit, least significant bit and discrete cosine transform combined, and discrete cosine transform and discrete wavelet transform combined. These embedded watermarking techniques are evaluated on how robust each technique is under image manipulations. Simulations are done using the three image watermarking techniques to determine the effects on how well the embedded watermarking technique resists manipulations..

Effects of different manipulations on images and audio with a watermark embedded

M.Ing. (Electrical Engineering)Abstract: This dissertation investigates different types of watermarking techniques that embed watermarks into images and audio files. These watermarking techniques are evaluated according to how robust each one is under manipulation. The effect of each technique on the extracted watermark is investigated and it is determined how well the watermarking technique resists manipulation. Certain watermarking techniques result in high robustness in some cases, but show visible artefacts. In some cases robustness is low, but image quality stays relatively close to the original watermark