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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">Sensory Systems</journal-id><journal-title-group><journal-title xml:lang="en">Sensory Systems</journal-title><trans-title-group xml:lang="ru"><trans-title>Сенсорные системы</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0235-0092</issn><issn publication-format="electronic">3034-5936</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">675784</article-id><article-id pub-id-type="doi">10.31857/S0235009224020059</article-id><article-id pub-id-type="edn">DDKZPO</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ТЕХНИЧЕСКОЕ ЗРЕНИЕ</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">Recognition of projectively transformed planar figures. XVII. Using plucker’s reciprocity theorem to describe ovals with an external fixed point</article-title><trans-title-group xml:lang="ru"><trans-title>Распознавание проективно преобразованных плоских фигур. XVII. Привлечение теоремы взаимности Плюккера для описания овалов с внешней фиксированной точкой</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikolaev</surname><given-names>P. P.</given-names></name><name xml:lang="ru"><surname>Николаев</surname><given-names>П. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>nikol@iitp.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">A. A. Kharkevich Institute of Information Transmission Problems of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт проблем передачи информации им А. А. Харкевича РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Smart Engines Service LLC</institution></aff><aff><institution xml:lang="ru">ООО “Смарт Энджинс Сервис”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-08-01" publication-format="electronic"><day>01</day><month>08</month><year>2024</year></pub-date><volume>38</volume><issue>2</issue><fpage>62</fpage><lpage>93</lpage><history><date date-type="received" iso-8601-date="2025-02-28"><day>28</day><month>02</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://journals.eco-vector.com/0235-0092/article/view/675784">https://journals.eco-vector.com/0235-0092/article/view/675784</self-uri><abstract xml:lang="en"><p>An approach to a projectively invariant description of a family of ovals (<bold>o</bold>) in scenes where the figure <bold>o</bold> is given in a composition with an external point, P, fixed in its plane is considered, and in cases where <bold>o</bold> has hidden symmetries (central or axial), the position of P is not specified in the form of an additional condition defining the scene, but can be calculated through the symmetry parameters. The invariant description, as a general universal method for numerical processing of compositions like “<bold>o</bold> + ext-P”, is proposed to be implemented in the form of Wurf mappings.The method uses the apparatus of dual pairs (DP) and wurf functions,previously developed and described by us, which are a product of decomposition of statements of the reciprocity theorem proposed by J. Plьcker to describe the properties of quadratic curves (conics).Illustrated examples of special cases of the “<bold>o</bold> + ext-P”composition are considered and discussed, actually completing the topic of studying the scenes like “an oval and a linear element of the plane”, which are classified according to the types of symmetry of <bold>o</bold>.</p></abstract><trans-abstract xml:lang="ru"><p>Рассмотрен подход к проективно инвариантному описанию семейства овалов (<bold>о</bold>) в сценах, где фигура<bold> о</bold> задана в композиции с фиксированной в ее плоскости внешней точкой P, причем в случаях, когда<bold> о</bold> обладает скрытыми симметриями (центральной либо осевой), позиция P не задается в виде дополнительного условия, комплектующего сцену, а может быть вычислена через параметры симметрии. Инвариантное описание, как общий универсальный метод численной обработки композиций вида “<bold>о</bold> + ext-P”, предлагается реализовать в виде вурф-отображений. Метод привлекает разработанный и описанный нами аппарат дуальных пар (ДП) и вурф-функций, представляющих собой продукт декомпозиции утверждений теоремы взаимности, предложенной Ю. Плюккером для описания свойств квадратичных кривых (коник). Модельные иллюстрированные примеры частных случаев композиции “<bold>о</bold> + ext-P” рассмотрены и обсуждены, фактически завершая тему исследования сцен вида “овал и линейный элемент плоскости”, классифицируемых по типам симметрии <bold>о</bold>.</p></trans-abstract><kwd-group xml:lang="en"><kwd>oval</kwd><kwd>center and axis of symmetry</kwd><kwd>Plücker pole and polar curve</kwd><kwd>dual pair</kwd><kwd>harmonic wurf</kwd><kwd>planar wurf</kwd><kwd>wurf function</kwd><kwd>descriptor</kwd><kwd>Lamé curve</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>овал</kwd><kwd>центр и ось симметрии</kwd><kwd>плюккеровы полюс и поляра</kwd><kwd>дуальная пара</kwd><kwd>гармонический вурф</kwd><kwd>плоскостной вурф</kwd><kwd>вурф-функция</kwd><kwd>дескриптор</kwd><kwd>кривая Ламе</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Akimova G.P., Bogdanov D.S., Kuratov P.A. 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