Multi-Channel Based Watermarking Scheme for Color Image
Xiao Li · Chinese Journal of Computers · 2004
This paper presents a new watermarking technique in spatial domain expressly devised for color images, which is based on the theory of transmit diversity techniques, considering the RGB image as three independent slowly fading channels. Modulated by different Pseudo-random sequences and interleavers respectively, the same watermark in different form is put into three color channels simultaneously. This scenario makes up the weakness in single color channel schemes that single color channel is prone to severe fading. Ahthors use two extraction methods to improve accuracy of decision. Theory analysis and experimental results demonstrate the validity of the new approach compared with algorithms operating on single color channel, explicitly lower bit error rate in most cases. Contrast to the present spatial watermarking schemes, this algorithm is considerably robust to many intentional and unintentional attacks. Moreover, information can be extracted in real time without the original image so that this scenario can be applied in video watermarking.