Keyphrases
- digital images
- image quality
- color images
- gray scale
- error diffusion
- image processing
- fragile watermarking
- watermarking algorithm
- data hiding
- copyright protection
- data sets
- watermarking scheme
- information hiding
- spread spectrum
- image authentication
- image processing operations
- inverse halftoning
- direct binary search
- image sequences
- robust image watermarking