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Conference Paper
Modified QIM Watermarking with Adaptive Two Step-sizes
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- Authors
- Won-Gyum Kim, Yong-Seok Seo, Young-ho Suh
- Issue Date
- 2007-01
- Citation
- Korea-Japan Joint Workshop on Frontiers of Computer Vision (FCV) 2007, pp.111-115
- Language
- English
- Type
- Conference Paper
- Abstract
- This paper proposes a QIM watermarking 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, watermarking scheme