An image watermark algorithm based on discrete cosine transform block classifying.
Yuehua ZhaoGuixian CaiYunhai DuPublished in: InfoSecu (2004)
Keyphrases
- image blocks
- discrete cosine transform
- test images
- image data
- multiscale
- computational complexity
- coded images
- image compression
- post processing
- image segmentation
- dct coefficients
- selection algorithm
- projection onto convex sets
- fast fourier transform
- jpeg images
- blocking artifacts
- watermarking technique
- block matching
- image quality
- multiresolution
- similarity measure