Marcas d'Água Frágeis de Autenticação para Imagens em Tonalidade Contínua e Esteganografia para Imagens Binárias e Meio-Tom.

摘要: Watermark is an information-carrying signal embedded into digital data that can be extracted later to make some assertion about the data. Digital watermarks are usually classified as robust or fragile. Robust designed resist most image manipulating procedures and used normally attest ownership. Fragile easily corrupted by any processing procedure. However, integrity checking must fragile, in order detect alteration. This tutorial course expounds principal authentication watermarking techniques for still continuous-tone images. It also major attacks against these how defend them. Afterwards, this will describe embed binary We restrict our study non-compressed images only.