The protection of copyrights of digital images authors\r\nis one of the most important tasks set before watermarking.\r\nWhat is especially important is to ensure the high\r\nrobustness of a watermarked images against attacks, preventing\r\nthe reading of additional information about the author.\r\nIn addition, the used processing of the original image\r\nmust be absolutely invisible. The presented algorithm embeds\r\ninformation in a parallel wayââ?¬â?independently of the\r\nluminance and chrominance matrices in the spatial and frequency\r\ndomains. The main factor motivating the use of a\r\nparallel watermark embedding via the proposed way was the\r\nmutual complementing of robustness, offered by processing\r\nin spatial and frequency domains. Additional information is\r\nrecovered in a 2D cepstrum domain and in coefficients of\r\nthe cosine transform. The article shows a description of a\r\nmathematical model, tests of invisibility, effectiveness and\r\nthe robustness of the method were carried out. The robustness\r\nof the algorithm was shown against the following attacks:\r\nJPEG and JPEG2000 lossy compression, noise, median\r\nfiltering, Low-Pass and High-Pass filtering, desynchronization,\r\nsimple and inverse D/A conversion, majority cropping,\r\nphotomontage and affine transformsââ?¬â?rotation, scaling,\r\nshearing, translation.
Loading....