{'fraction_non_alphanumeric': 0.014071294559099437, 'fraction_numerical': 0.0, 'mean_word_length': 6.1610738255033555, '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}}
Constructing Virtual Image for Navigational Fix Training Based on Digital Watermarking

Virtual reality technology can construct the approximate nautical environment required for navigational fix training, which can not only make positioning teaching more intuitive and vivid, but also make trainees physically and psychologically immersed into training, thereby greatly improving the training quality. In this paper, a digital watermarking-based Image construction method for Navigational Fix training is proposed, with which the observational information will be embedded previously: the invisible watermark carrying the coordinate information is embedded in the video frame, and the observation value will be obtained after extracting the coordinate information in the observation picture. Using this method, the observation error caused by the projection distortion is bypassed, so that the accuracy of training feedback of multiple observation devices can be guaranteed. Thereby the overall system's accuracy requirements and construction difficulty is reduced.