{'fraction_non_alphanumeric': 0.008556149732620321, 'fraction_numerical': 0.0, 'mean_word_length': 5.5, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A Robust Color Image Watermarking Scheme Based on Image Normalization

The robustness of watermarks to geometric attacks is considered to be the most challenging design requirements for watermarks. Geometric attacks can desynchronize the location of the watermark and hence cause incorrect watermark detection. In this paper, a new color image watermarking scheme for copyright protection is proposed. It is based on embedding multiple watermark bits into the luminance component or the blue component of a color image in discrete wavelet domain. The proposed scheme uses image normalization technique to reduce the effect of synchronization errors caused by geometric attacks such as rotation. The extraction process does not require the original image. Experimental results show that the proposed scheme successfully makes the watermark perceptually invisible as well as robust to common signal processing and some geometric attacks.