Keyphrases
- human visual system
- color images
- watermark embedding
- color perception
- image quality
- human perception
- wavelet domain
- visual quality
- gray scale
- human vision
- watermarking algorithm
- color space
- visual information
- quality assessment
- color information
- saliency map
- digital images
- image processing
- spread spectrum
- contrast sensitivity
- human perceptual
- copyright protection
- contrast enhancement
- watermarking scheme
- data hiding
- quality metrics
- image watermarking
- just noticeable difference
- image quality metrics
- digital watermarking
- human observers
- high frequency
- error diffusion
- perceptual quality
- visual saliency
- dct domain
- bit rate
- feature extraction