20-05-2013, 03:12 PM
Digital Image Watermarking using Discrete Cosine Transform
Digital Image Watermarking.pptx (Size: 806.86 KB / Downloads: 17)
Introduction
Digital watermarking is a technique, which allows an individual to add hidden copyright notices, or other verification messages to digital audio, video or image signals and documents.
Digital image watermarking provides copyright protection to image by hiding appropriate information in original image to declare rightful ownership.
Motivation
Motivated by growing concern about the protection of intellectual property on the internet the interest of watermarking techniques has been increasing over the recent years.
Definition
Digital image watermarking is a technique which allows an individual to add hidden copyright notices or other verification messages to digital images,without destroying the quality or information content of the image
Watermarking Techniques According to working Domain
Spatial Domain
slightly modifies the pixels of one or two randomly selected subsets of an image
Frequency Domain
Values of certain frequencies are altered from their original
Eg: DCT(Discrete Cosine Transform)