Keyphrases
- halftone images
- high capacity
- data hiding
- watermarking technique
- inverse halftoning
- black and white
- digital images
- gray scale
- error diffusion
- watermarking scheme
- watermarking algorithm
- copyright protection
- original images
- spatial domain
- image quality
- human visual system
- continuous tone images
- digital watermarking
- error correction
- visual quality
- security analysis
- key management
- jpeg compression
- security protocols
- perceptual quality
- encryption algorithm
- signal processing
- image processing
- gray images
- binary images
- data protection
- security requirements