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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Biology Bulletin</journal-id><journal-title-group><journal-title xml:lang="en">Biology Bulletin</journal-title><trans-title-group xml:lang="ru"><trans-title>Известия Российской академии наук. Серия биологическая</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1026-3470</issn><issn publication-format="electronic">3034-5367</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">647775</article-id><article-id pub-id-type="doi">10.31857/S1026347024040015</article-id><article-id pub-id-type="edn">VINVUJ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ТЕОРЕТИЧЕСКАЯ &#13;
И ЭВОЛЮЦИОННАЯ БИОЛОГИЯ</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ТЕОРЕТИЧЕСКАЯ И ЭВОЛЮЦИОННАЯ БИОЛОГИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Application of harmonized elliptic Fourier transform coefficients for comparing the shapes of biological structures (on the example of the attachment organs of monogenea)</article-title><trans-title-group xml:lang="ru"><trans-title>Применение согласованных коэффициентов эллиптического преобразования Фурье для сравнения форм биологических структур (на примере прикрепительных органов моногеней)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lyakh</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Лях</surname><given-names>А. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>me@antonlyakh.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS</institution></aff><aff><institution xml:lang="ru">ФГБУН ФИЦ “Институт биологии южных морей им. А.О. Ковалевского РАН”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-10-26" publication-format="electronic"><day>26</day><month>10</month><year>2024</year></pub-date><issue>4</issue><fpage>429</fpage><lpage>440</lpage><history><date date-type="received" iso-8601-date="2025-01-28"><day>28</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://medjrf.com/1026-3470/article/view/647775">https://medjrf.com/1026-3470/article/view/647775</self-uri><abstract xml:lang="en"><p>Elliptic Fourier transform is a common method of describing the shape of objects by an unique sequence of coefficients that allow comparing the shapes by mathematical methods. However, raw coefficients contain unnecessary data unrelated to the shape, which does not provide a correct comparison. For this reason the coefficients are normalised. This removes some of the superfluous data, but leaves information about mirror symmetry and the order in which the contour vertices are declared, that are encoded in the signs of the coefficients. This also interfere with shape comparison. The paper describes an algorithm for harmonizing the coefficients, leveling the influence of the mentioned information. On the example of attachment organs of monogeneas, the advantages of using harmonized coefficients for comparing the shapes of biological structures are shown.</p></abstract><trans-abstract xml:lang="ru"><p>Эллиптическое преобразование Фурье – распространенный метод описания формы объектов уникальной последовательностью коэффициентов, которые позволяют сравнить формы математическими методами. Однако сырые коэффициенты содержат лишние данные, не связанные с формой, что не обеспечивает корректное сравнение. По этой причине коэффициенты нормируют. Это убирает часть лишних данных, но оставляет информацию о зеркальной симметрии и порядке обхода контуров объектов, закодированные в знаках коэффициентов, которые также мешают сравнению форм. В работе описан алгоритм согласования нормированных коэффициентов, нивелирующий влияние упомянутой информации. На примере прикрепительных органов моногеней показаны преимущества использования согласованных коэффициентов для сравнения форм биологических структур.</p></trans-abstract><kwd-group xml:lang="en"><kwd>shape analysis</kwd><kwd>object outlines</kwd><kwd>morphometry</kwd><kwd>geometric features</kwd><kwd>mirror symmetry</kwd><kwd>algorithm</kwd><kwd>cluster analysis</kwd><kwd>tanglegram</kwd><kwd>parasites</kwd><kwd>fish parasites</kwd><kwd>monogenean attachment organs</kwd><kwd>flatworms</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>анализ форм</kwd><kwd>контур объекта</kwd><kwd>морфометрия</kwd><kwd>геометрические признаки, зеркальная симметрия</kwd><kwd>алгоритм</kwd><kwd>кластерный анализ</kwd><kwd>танглеграмма</kwd><kwd>паразиты рыб</kwd><kwd>прикрепительные органы моногеней</kwd><kwd>плоские черви</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство РФ</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap></funding-source><award-id>124022400148-4</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Быховский Б. 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