Hologram Watermarks for Document Authentications.
Jana DittmannLucilla Croce FerriClaus VielhauerPublished in: ITCC (2001)
Keyphrases
- digital images
- document images
- digital camera
- information retrieval systems
- web documents
- information retrieval
- document clustering
- retrieval systems
- document collections
- document analysis
- authentication protocol
- image watermarking
- copyright protection
- spread spectrum
- image authentication
- watermarking algorithm
- document representation
- watermarking scheme
- vector space model
- wavelet domain
- document retrieval
- low cost
- co occurrence
- keywords
- image processing