Title :
QIM Watermarking for Image with Two Adaptive Quantization Ste-sizes
Author :
Seo, Yong-Seok ; Kim, Won-gyum ; Suh, Young-Ho ; Oh, Won-geun ; Hwang, Chi-Jung
Author_Institution :
Div. of Digital Contents Res., ETRI, Daejeon
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).
Keywords :
quantisation (signal); watermarking; QIM image watermarking scheme; adaptive quantization step-sizes; auto-correlation function; digital image; Autocorrelation; Computer science; Copyright protection; Decoding; Digital images; Image edge detection; Information security; Modulation coding; Quantization; Watermarking; Digital watermarking; QIM; quantization;
Conference_Titel :
Advanced Communication Technology, The 9th International Conference on
Conference_Location :
Gangwon-Do
Print_ISBN :
978-89-5519-131-8
DOI :
10.1109/ICACT.2007.358470
