An improved Spread Spectrum Watermarking
technique to withstand Geometric Deformations
International Journal on Signal & Image Processing, 1 (1):
5 (January 2010)Abstract
Here, we propose a new method for the
watermarking to withstand the geometric attacks, which
may occur during the transmission of the watermarked
image. The underlying system is based on Direct Sequence
Code Division Multiple Access (DS-CDMA). The algorithm
for the normalization has been formulated for use in black
and white images. The watermark is spread across the
carrier image by using the pseudo-random noise sequences
of optimal period and retrieval is made by the use of
correlation. Private Key technique is used so the
transmission is very secure. Matlab was used to implement
the algorithm discussed here.