Abstract
In this paper we present real data Bit Error Rate (BER) performance tests of recently proposed corelation-and-bit-aware improved spread spectrum (CAISS) watermarking scheme [8]. Our tests were performed in DCT domain. The results show significant improvement as compared with traditional spread spectrum technique applied to the same and identically prepared data. Tests performed under medium JPEG compression and fixed Peak Signal-to-Noise Ratio (PSNR) level indicate that appropriate choice of CAISS parameters results in over a two orders of magnitude smaller BER as compared with spread spectrum technique without side information about correlation. We also compared CAISS with improved spread spectrum scheme and found that CAISS can perform approximately two times better than ISS (in terms of BER) after medium JPEG compression.
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