On the host signal approximation for image data hiding scheme based on complete complementary codes
Tetsuya Kojima, Kakeru Kato · 2017
Complete complementary code (CCC) is a family of spread spectrum sequences having ideal correlation properties. Digital watermarking techniques based on CCC have been proposed by the authors. It has been shown that the proposed digital watermarking has high payload capacity even in the blind detection case. An improvement of CCC-based digital watermarking scheme called HSA (host signal approximation) has been proposed. In HSA, embedding strengths are optimized in order to approximate the DCT components of the cover image with the embedded signals. In this method, different embedding strengths are applied to different embedded bits while a constant strength is applied to every embedded bit in the conventional method. In the previous studies, the performance of HSA has been shown only for a couple of example images. In this report, PSNR (peak-signal-to-noise ratio) and BER (bit error rate) performances of HSA are evaluated for over 100 cover images through numerical experiments. Also an improvement of HSA is also proposed.