Keyphrases
- watermark detection
- signal processing
- watermarking algorithm
- spread spectrum
- watermarking scheme
- image watermarking
- dct domain
- digital watermarking
- copyright protection
- digital images
- multimedia
- watermarking technique
- jpeg compression
- digital video
- face recognition
- preprocessing
- visual information
- dct coefficients
- feature extraction
- watermark embedding
- image processing
- transform domain
- principal component analysis
- geometric distortions
- audio signal
- computer vision
- human visual system
- lossy compression
- watermarking method