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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">pribor</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Приборостроение</journal-title><trans-title-group xml:lang="en"><trans-title>Journal of Instrument Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3454</issn><issn pub-type="epub">2500-0381</issn><publisher><publisher-name>Национальный исследовательский университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/0021-3454-2023-66-5-399-408</article-id><article-id custom-type="elpub" pub-id-type="custom">pribor-115</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СИСТЕМНЫЙ АНАЛИЗ, УПРАВЛЕНИЕ И ОБРАБОТКА ИНФОРМАЦИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SYSTEM ANALYSIS, MANAGEMENT AND INFORMATION PROCESSING</subject></subj-group></article-categories><title-group><article-title>Структурированные по Уолшу двухуровневые и модульно двухуровневые квазиортогональные матрицы для маскирования изображений</article-title><trans-title-group xml:lang="en"><trans-title>Two-level and modularly two-level quasi-orthogonal Walsh-structured matrices for image masking</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сергеев</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Sergeev</surname><given-names>A. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сергеев Александр Михайлович — канд. техн. наук; кафедра вычислительных систем и сетей, СПб ГУАП; доцент.</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Aleksandеr M. Sergeev — PhD; St. Petersburg State University of Aerospace Instrumentation, Department of Computer Systems and Network; Associate Professor.</p><p>St. Petersburg</p></bio><email xlink:type="simple">aleks.asklab@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный университет аэрокосмического приборостроения</institution></aff><aff xml:lang="en"><institution>St. Petersburg State University of Aerospace Instrumentation</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>26</day><month>11</month><year>2024</year></pub-date><volume>66</volume><issue>5</issue><fpage>399</fpage><lpage>408</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Национальный исследовательский университет ИТМО, 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Национальный исследовательский университет ИТМО</copyright-holder><copyright-holder xml:lang="en">Национальный исследовательский университет ИТМО</copyright-holder><license xlink:href="https://pribor.ifmo.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://pribor.ifmo.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://pribor.ifmo.ru/jour/article/view/115">https://pribor.ifmo.ru/jour/article/view/115</self-uri><abstract><p>Рассматривается отдельный класс квазиортогональных матриц, а именно двухуровневые матрицы Мерсенна, структурированные по Уолшу. Показано отличие систем ортогональных функций Адамара — Уолша и Мерсенна — Уолша. Рассматриваются модульно двухуровневые матрицы Мерсенна — Уолша и их портреты. Система функций на основе модульно двухуровневой матрицы Мерсенна — Уолша имеет вдвое больше уровней, чем система функций, построенная на основе двухуровневой матрицы Мерсенна, структурированной по Уолшу. В качестве прикладной задачи с использованием структурированных квазиортогональных матриц рассматривается процедура маскирования двухуровневыми и модульно двухуровневыми матрицами Мерсенна — Уолша изображений с оценкой результатов маскирования — разрушения исходного изображения. На примере тестового изображения демонстрируется изменение гистограммы яркостей и влияние порядка маскирующей матрицы на результат маскирования.</p></abstract><trans-abstract xml:lang="en"><p>A separate class of quasi-orthogonal matrices, namely, two-level Mersenne matrices structured according to Walsh, are studied. The difference between the systems of orthogonal Hadamard–Walsh and Mersenne–Walsh functions is shown. Modular two-level Mersenne–Walsh matrices and their portraits are considered. A system of functions constructed using a modularly two-level Mersenne–Walsh matrix has twice as many levels as a system of functions constructed on the basis of a two-level Mersenne matrix structured according to Walsh. As an applied problem using structured quasi-orthogonal matrices, the procedure for masking images with two-level and modularly two-level Mersenne-Walsh matrices with an assessment of the results of masking-destruction of the original image is considered. The example of a test image demonstrates the change in the brightness histogram and the influence of the order of the masking matrix on the masking result.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>квазиортогональные матрицы</kwd><kwd>матрицы Адамара — Уолша</kwd><kwd>матрицы Мерсенна — Уолша</kwd><kwd>модульно двухуровневые матрицы</kwd><kwd>маскирование изображений</kwd></kwd-group><kwd-group xml:lang="en"><kwd>quasi-orthogonal matrices</kwd><kwd>Hadamard–Walsh matrices</kwd><kwd>Mersenne–Walsh matrices</kwd><kwd>modular two-level matrices</kwd><kwd>image masking</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Horadam K. J. Hadamard matrices and their applications. Princeton Univ. Press, 2007. 263 р.</mixed-citation><mixed-citation xml:lang="en">Horadam K.J. 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