Image watermarking algorithm applied to free space optical communication
Jingfeng Zang, FuChang Yin, Zhiqi Lin · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2009
The AGWN model, based on the atmospheric attenuation and turbulence effect is present. In the paper, a robust image watermark technology is proposed based on extended set partitioning in hierarchical trees algorithm (ESPIHT) and low density Parity check codes (LDPC). The Watermarking Algorithm is applied in the free space optical communication (FSO) by Joint Source-Channel Coding (JSCC), and simulated in BPSK modulation over AWGN channel and different level error correction channel coding. The results of simulation show that the presented algorithm is effective and robust to common image processing operations and some distortions such as cropping, pinching, pixel-shifting and so on. And it has strong error correction performance in burst errors and random errors, so it is appropriate for complicated environment of FSO.