This paper presents a spatial domain image watermarking method based on regularized filter. In the proposed method, a watermark image is embedded into a host color image directly by modifying the blue color component. The watermarkmark strength is controlled by two factors, i.e. a constant value and the luminance within a local embedding area. The prediction of the original host image is obtained from the watermarked image by using the regularized filter, so that the embedded watermark can be blindly recovered by substracting the predicted image from the watermarked image. Set of experiment are carried out to verify our proposed method. The results show that the accuracy of the extracted watermark in terms of NC was higher, compared to the previous method. The robustness comparison between both methods against different types of attacks is also performed and presented.
This paper proposes a digital image watermarking method in homomorphic domain. In the proposed method, a homomorphic filter is applied to the host color image to extract a low variational illumination component. This component is used to embed a binary watermark image with the same size as host image. The watermark extraction is achieved by using an original illumination component prediction technique based on linear combination of watermarked component values around the embedded one. The predicted component is subtracted from the watermarked component to obtain the extracted watermark. The performance of the proposed method in terms of average NC is evaluated and compared with the previous work. Its robustness against image processing based attacks at various strengths is also compared.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.