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Conference Paper
QIM Watermarking for Image with Two Adaptive Quantization Ste-sizes
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- Authors
- Yong-Seok Seo, Won-Gyum Kim, Young-Ho Suh, Won-Geun Oh, Chi-Jung Hwang
- Issue Date
- 2007-02
- Citation
- International Conference on Advanced Communication Technology (ICACT) 2007, pp.797-800
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- This paper proposes a QIM watermarkin -g scheme for a digital image with two adaptive quantization step-sizes. After calculating an edge map of the image, in a flat region a small step-size is applied and in an edge region a large step-size is used. The threshold between flat and edge is decided empirically and watermark blocks are embedded repeatedly into the image using different step-sizes. In the detection process, we show how to estimate the threshold value by ACF (Auto-Correlation Function).
- KSP Keywords
- Edge map, QIM Watermarking, Small step, Step size, Threshold Value, adaptive quantization, auto-correlation function(ACF), detection process, digital image, flat region