New Video Watermarking Scheme by Using Dither Modulation to Local Energy
Xiaoyan Liu, Lihong Ma, Hu-Yun Yin · 2007
This paper proposes the differential energy modulation (DEM) algorithm for video watermarking. In DEM scheme, the watermark bits are embedded by dithering differential energy in Quantization Index Modulation (QIM). The energy difference between horizontal edge components and the vertical ones in a quantized block is modulated by modifying some edge components to make the differential energy consistent with a dithered quantizer. Besides, the watermarked positions are carefully selected to preserve video quality. Experimental results demonstrate that our DEM scheme performs better on visual quality impact, capacity, robustness and rate maintenance than the DEW (Differential Energy watermarking) method.