Image and video quality evaluation is very important. In applications involving signal transmission, the Reducedor No-Reference quality metrics are generally more practical than the Full-Reference metrics. Digital watermarking based quality evaluation emerges as a potential Reducedor No-Reference quality metric, which estimates signal quality by assessing the degradation of the embedded waterma...

This paper presents a watermarking technique for fingerprint images using the DWT-SVD (Discrete WaveletTransform -Singular Value Decomposition). The watermarking image is embedded and extracted to calculated the PSNR (Peak Signal to Noise Ratio) and NC (Normalized cross correlation) value. Watermark Embedding Technique or the algorithm should be imperceptible i.e. embedding watermark should not...

This paper presents a new watermarking framework, suitable for authentication of H.264 compressed videos. The authentication data is embedded as fragile, blind and erasable watermark with low video quality degradations. Because of using a fragile watermark, hard authentication is possible. In contrast to other approaches, the watermarking is done after the H.264 compression process. Hence, the ...

In the present scenario, data security is one of the major challenges. Watermarking is a technique in which a digital signal or pattern is inserted into a digital image for security reasons. Watermarking is mainly used for copyright protection, owner authentication and id card security. A watermark is a signal added to digital data such as audio, video and still images that can be detected or e...

In this paper, the distortion introduced by cameras of smart phones such as iPhone 3G and iPhone 3GS is measured and quantified. In particular, the spatial frequency response (SFR) of a mobile camera phone is measured [1]. A new robustness metric that relates camera phone quality to watermark robustness is defined. Experiments were conducted using watermarked images to verify the predictions ma...

Most watermarking methods for images and video have been proposed are based on ideas from spread spectrum radio communications, namely additive embedding of a (signal adaptive or non-adaptive) pseudo-noise watermark pattern, and watermark recovery by correlation. Even methods that are not presented as spread spectrum methods often build on these principles. Recently, some scepticism about the r...

A novel method for multi-bit image watermarking robust to geometric distortions is proposed. A binary watermark is embedded in a grayscale or a color host image. The ability of progressive watermark detection enables fast and robust watermark detection even after several geometric distortions of the watermarked image. The embedding of a multi-bit message and its robust decoding after the waterm...

Fragile image watermarking could be used to authenticate a digital image due to modification or altering. A watermark is embedded into the image. When the image was modified or altered, the watermark is also altered or fragile. One of popular image format is GIF image. Some fragile watermarking algorithms are applied to the single GIF image only, none for animated images. However, we could modi...

In this paper, a digital watermarking algorithm for copyright protection based on the concept of embed digital watermark and modifying frequency coefficients in discrete wavelet transform (DWT) domain is presented. We embed the watermark into the detail wavelet coefficients of the original image with the use of a key. This key is randomly generated and is used to select the exact locations in t...