Keyphrases
- special issue
- data hiding
- visual cryptography
- halftone images
- multimedia
- secret information
- error correction
- spread spectrum
- secret sharing scheme
- spatial domain
- high capacity
- secret data
- key management
- information hiding
- multimedia content
- data embedding
- watermarking technique
- secret image
- cover image
- multimedia data
- error diffusion
- frequency domain
- feature extraction