Keyphrases
- dct coefficients
- watermarking algorithm
- dct domain
- discrete cosine transform
- jpeg compression
- transform domain
- watermarking method
- watermarking scheme
- compressed domain
- image watermarking
- jpeg images
- spread spectrum
- image authentication
- signal processing
- digital images
- feature vectors
- watermark detection
- image blocks
- feature space
- copyright protection
- compressed images
- high resolution
- high quality