Image watermarking using block site selection and DCT domain constraints

Image watermarking using block site selection and DCT domain constraints.

In this paper we propose an image watermarking algorithm based on constraints in the Discrete Cosine Transform (DCT) domain. An image watermarking algorithm has two stages: signature casting (embedding) and signature detection. In the first stage it embeds an identifying label in the image. This is recognized in the second stage. The proposed algorithm has two processing steps. In the first ste...

Image watermarking using DCT domain constraints

Digital Image Watermarking In DCT Domain

Digital Image watermarking is the process that embeds data called watermark in to multimedia object such that the watermark can be extracted or detected to make an assertion about the object. Watermarking is either “visible” or “invisible”. The growth of high speed computer networks and internets, in particular, explore the means of new business, scientific, entertainment and social opportuniti...

Recognizing Image authenticity using DCT based watermarking

The authenticity of the watermarked images under various incidental noise is considered in this paper. The watermark is generated using from the content invariant properties of the image and securely embedded in the selected higher textured blocks of the DCT transform of the image to make them robust to jpeg compression and incidental distortions. Response of the authenticator to watermarked im...

Dct-domain Image Watermarking and Generalized Gaussian Models

A novel DCT-domain watermark extraction procedure for still images that does not require the original image is presented. This method is based on a generalized Gaussian model, which includes as a special case the cross-correlationbased watermark detector, used so far in the literature. The optimal maximum likelihood (ML) detector is given, which allows to analytically assess the performance of ...