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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">rmjournal</journal-id><journal-title-group><journal-title xml:lang="ru">Эталоны. Стандартные  образцы</journal-title><trans-title-group xml:lang="en"><trans-title>Measurement Standards. Reference Materials</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2687-0886</issn><publisher><publisher-name>D. I. Mendeleyev Institute for Metrology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20915/2077-1177-2024-20-2-77-98</article-id><article-id custom-type="elpub" pub-id-type="custom">rmjournal-490</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>Современные методы анализа веществ и материалов</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Modern methods of analysis of substances and materials</subject></subj-group></article-categories><title-group><article-title>Исследование линейности методов измерений цвета в колориметрии цифровых изображений</article-title><trans-title-group xml:lang="en"><trans-title>Linearity Study of Color Measurement Methods in Digital Image Colorimetry</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7067-0224</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Савкова</surname><given-names>Е. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Saukova</surname><given-names>Y. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Савкова Евгения Николаевна – канд. техн. наук, доцент, ведущий научный сотрудник научно-исследовательской лаборатории полупроводниковой техники филиала БНТУ «Научноисследовательский политехнический институт» Республика Беларусь,</p><p>220013, г. Минск, пр-т Независимости, 65</p></bio><bio xml:lang="en"><p>Yauheniya N. Saukova – Cand. Sci. (Eng.), Associate Professor, Leading Researcher of the Research Laboratory of Semiconductor Engineering, BNTU Branch, Research Polytechnic Institute</p><p>65 pr. Nezavisimosti, Minsk, 220013</p></bio><email xlink:type="simple">savkova@bntu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский национальный технический университет</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Belarusian National Technical University</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>01</day><month>07</month><year>2024</year></pub-date><volume>20</volume><issue>2</issue><fpage>77</fpage><lpage>98</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Савкова Е.Н., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Савкова Е.Н.</copyright-holder><copyright-holder xml:lang="en">Saukova Y.N.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.rmjournal.ru/jour/article/view/490">https://www.rmjournal.ru/jour/article/view/490</self-uri><abstract><p>Метрология цвета неуклонно развивается в интересах фундаментальной и прикладной науки, совершенствования производственных процессов в промышленности. Автор статьи рассматривает проблему обеспечения метрологической прослеживаемости измерений цвета в натурных условиях.</p><p>В частности, методы колориметрии цифровых изображений показывают хорошие валидационные характеристики – линейность и прецизионность – в относительно небольших диапазонах применения при исследованиях однотипных и преимущественно несамосветящихся объектов. Для сложных сцен с широким диапазоном яркостей применяют нелинейные функциональные модели цветопередачи, ориентированные на зрительные восприятия, пиковую яркость монитора и эталонные условия просмотра, что затрудняет обработку результатов измерений и снижает уровень доверия.</p><p>Описанный в статье метод измерений координат цветности объекта по его цифровому изображению основан на тензорном исчислении и заключается в многократной регистрации объекта и наборов опорных образцов с различным временем экспозиции, а также построении градуировочных зависимостей, формирующих многомерную колориметрическую шкалу в цветовом пространстве. Кроме того, метод состоит в определении координат цветности как точек пересечения цветовых тензоров с плоскостью цветового локуса. Для обеспечения точности и достоверности результатов измерений в программно-аппаратных средах автор провел валидационное исследование показателей эффективности данного метода, одним из которых является линейность. В итоге данный эксперимент, основанный на сличении разработанного метода с референтной методикой измерений, показал эффективность разработанного широкодиапазонного метода измерений с хорошей линейностью (коэффициент корреляции R=0,97…0,99, остаточное относительное стандартное отклонение s0≈1–2 %) при отстройке от субъективного фактора и устройства отображения.</p><p>Материалы эксперимента могут быть полезны специалистам – метрологам, решающим задачи по определению метрологической прослеживаемости цвета цифровых изображений в средах. Статья будет интересна широкому кругу читателей, чьи профессиональные интересы или увлечения связаны с колориметрией цифровых изображений.</p></abstract><trans-abstract xml:lang="en"><p>Color metrology is steadily developing in the interests of fundamental and applied science, improving industrial production processes. The author considers the problem of ensuring metrological traceability of color measurements under natural conditions.</p><p>Digital image colorimetry methods demonstrate good linearity and precision in relatively small application ranges in studies of same type and mainly non-luminous objects. For complex scenes with a wide range of brightnesses, nonlinear functional color rendering models are used that are focused on visual perception, peak brightness of the monitor and reference viewing conditions, which complicates the processing of measurement results and reduces a confidence interval.</p><p>The described method of measuring the chromaticity coordinates of an object by its digital image is based on tensor calculus and consists of multiple registration of an object and sets of reference samples with different exposure times, building calibration dependencies forming a multidimensional colorimetric scale in color space and determining chromaticity coordinates as points of intersection of color tensors with the plane of the color locus. In order to ensure accuracy and reliability of the measurement results in the software and hardware environments, a validation study of the performance indicators of this method was carried out, one of which is linearity. An experiment based on comparing the developed method with the reference measurement method showed the effectiveness of the developed wide-range measurement method with good linearity (correlation coefficient R=0.97… 0.99, residual relative standard deviation s0≈1–2%) when adjusting from the subjective factor and display device.</p><p>The experimental materials may be useful to metrologists solving problems of determining the metrological traceability of the color of digital images in media. The article will be of interest to a wide range of readers with professional interests related to the colorimetry of digital images.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>цифровое изображение</kwd><kwd>цвет</kwd><kwd>колориметрия</kwd><kwd>линейность</kwd><kwd>функциональная модель</kwd></kwd-group><kwd-group xml:lang="en"><kwd>digital image</kwd><kwd>color</kwd><kwd>colorimetry</kwd><kwd>linearity</kwd><kwd>functional model</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">Digital colorimetry in chemical and pharmaceutical analysis / A. A. Chaplenko [et al.] // Moscow University Chemistry Bulletin. 2022. Vol. 77. P. 61–67. https://doi.org/10.3103/S002713142202002X</mixed-citation><mixed-citation xml:lang="en">Chaplenko A. A., Monogarova O. V., Oskolok K. V., Garmay A. V. Digital colorimetry in chemical and pharmaceutical analysis. Moscow University Chemistry Bulletin. 2022;77:61–67. https://doi.org/10.3103/S002713142202002X</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Inner product of RGB unit vectors for simple and versatile detection of color transition / N. Kakiuchi [et al.] // Analytical Science. 2021. Vol. 37, № 1. P. 3–5. https://doi.org/10.2116/analsci.20C015</mixed-citation><mixed-citation xml:lang="en">Kakiuchi N., Ochiai J., Takeuchi M., Tanaka H. Inner product of RGB unit vectors for simple and versatile detection of color transition. Analytical Science. 2021;37(1):3–5. https://doi.org/10.2116/analsci.20C015</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Development of a double monitoring system for the determination of Cr(VI) in different water matrices by HPLC– UV and digital image-based colorimetric detection method with the help of a metal sieve-linked double syringe system in complexation / T. U. Gösterişli [et al.] // Environmental Monitoring and Assessment. 2022. Vol. 194. P. 691. https://doi.org/10.1007/s10661-022-10392-2</mixed-citation><mixed-citation xml:lang="en">Gösterişli T. U., Oflu S., Keyf S., Bakırdere S. Development of a double monitoring system for the determination of Cr(VI) in different water matrices by HPLC–UV and digital image-based colorimetric detection method with the help of a metal sieve-linked double syringe system in complexation. Environmental Monitoring and Assessment. 2022;194:691. https://doi.org/10.1007/s10661-022-10392-2</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Development of a double-monitoring method for the determination of total antioxidant capacity as ascorbic acid equivalent using CUPRAC assay with RP-HPLC and digital image-based colorimetric detection / T. Borahan [et al.] // European Food Research and Technology. 2022. Vol. 248. P. 707–713. https://doi.org/10.1007/s00217-021-03923-7</mixed-citation><mixed-citation xml:lang="en">Borahan T., Girgin A., Atsever N., Zaman B. T., Chormey D. S., Bakırdere S. Development of a double-monitoring method for the determination of total antioxidant capacity as ascorbic acid equivalent using CUPRAC assay with RP-HPLC and digital image-based colorimetric detection. European Food Research and Technology. 2022;248:707–713. https://doi.org/10.1007/s00217-021-03923-7</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Khalid H. S., Fakhre N. A. An android smartphone-based digital image colorimeter for detecting acid fuchsine dye in aqueous solutions // Journal of the Iranian Chemical Society. 2023. Vol. 20. P. 3043–3057. https://doi.org/10.1007/s13738-023-02896-6</mixed-citation><mixed-citation xml:lang="en">Khalid H. S., Fakhre N. A. An android smartphone-based digital image colorimeter for detecting acid fuchsine dye in aqueous solutions. Journal of the Iranian Chemical Society. 2023;20:3043–3057. https://doi.org/10.1007/s13738-023-02896-6</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Polat F. An advantageous analytical method for the determination of fluoride in saliva exploiting smartphone-based digital-image colorimetry // Chemical Papers. 2022. Vol. 76. P. 6215–6221. https://doi.org/10.1007/s11696–022–02313-x</mixed-citation><mixed-citation xml:lang="en">Polat F. An advantageous analytical method for the determination of fluoride in saliva exploiting smartphone-based digital-image colorimetry. Chemical Papers. 2022;76:6215–6221. https://doi.org/10.1007/s11696-022-02313-x</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Exploring smart phone based colorimetric technology for on-site quantitative determination of adulterant (neutralizer) in milk / V. Kumar [et al.] // Journal of Food Science and Technology. 2022. Vol. 59. P. 3693–3699. https://doi.org/10.1007/s13197-022-05392-6</mixed-citation><mixed-citation xml:lang="en">Kumar V., Aulakh R. S., Gill J. P. S., Sharma A. Exploring smart phone based colorimetric technology for on-site quantitative determination of adulterant (neutralizer) in milk. Journal of Food Science and Technology. 2022;59:3693–3699. https://doi.org/10.1007/s13197-022-05392-6</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Saadati M. A simple spot test method with digital imaging for chromium speciation in water samples // Journal of Analytical Chemistry. 2022. Vol. 77. P. 704–710. https://doi.org/10.1134/S1061934822060089</mixed-citation><mixed-citation xml:lang="en">Saadati M. A Simple spot test method with digital imaging for chromium speciation in water samples. Journal of Analytical Chemistry. 2022;77:704–710. https://doi.org/10.1134/S1061934822060089</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">A method based on digital image colorimetry for determination of total phenolic content in fruits / R. C. Costa [et al.] // Food Analytical Methods. 2023. Vol. 16. P. 1261–1270. https://doi.org/10.1007/s12161-023-02492-7</mixed-citation><mixed-citation xml:lang="en">Costa R. C., Leite J. C., Brandão G. C., Costa F. S. L., dos Santos W. N. L. A method based on digital image colorimetry for determination of total phenolic content in fruits. Food Analytical Methods. 2023;16:1261–1270. https://doi.org/10.1007/s12161-023-02492-7</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Caleja-Ballesteros H. J. R., Ballesteros J. I. Digital image-based quantification of ethanol in distilled spirits using red cabbage (Brassica oleracea) extract // Chemical Papers. Vol. 77. P. 7977–7984. https://doi.org/10.1007/s11696-023-03034-5</mixed-citation><mixed-citation xml:lang="en">Caleja-Ballesteros H. J. R., Ballesteros J. I. Digital image-based quantification of ethanol in distilled spirits using red cabbage (Brassica oleracea) extract. Chemical Papers. 2023;77:7977–7984. https://doi.org/10.1007/s11696-023-03034-5</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Palygorskite and solvatochromic dye in solid-state colorimetric devices for rapid assessment of the amount of water in ethanol fuel / C.G. de Souza [et al.] // Chemical Papers. 2023. Vol. 77. P. 6341–6350. https://doi.org/10.1007/s11696-023-02943-9</mixed-citation><mixed-citation xml:lang="en">de Souza C. G., dos Santos R. C., Bertolino L. C., de Andrade D. F., d´Avila L. A., Spinelli L. Palygorskite and solvatochromic dye in solid-state colorimetric devices for rapid assessment of the amount of water in ethanol fuel. Chemical Papers. 2023;77:6341–6350. https://doi.org/10.1007/s11696-023-02943-9</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Inagawa A., Kimura M., Uehara N. Total protein assay by PCA-based RGB-spectrum conversion methods with smartphone-acquired digital images // Analytical Sciences. 2022. Vol. 38. P. 869–880. https://doi.org/10.1007/s44211-022-00107-5</mixed-citation><mixed-citation xml:lang="en">Inagawa A., Kimura M., Uehara N. Total protein assay by PCA-based RGB-spectrum conversion methods with smartphone-acquired digital images. Analytical Sciences. 2022;38:869–880. https://doi.org/10.1007/s44211-022-00107-5</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Yin C., Zhang X. Role of high-precision real-time digital image based on data simulation in the construction of rural public space environment // Soft Computing. 2023. https://doi.org/10.1007/s00500-023-08376-6</mixed-citation><mixed-citation xml:lang="en">Yin C., Zhang X. Role of high-precision real-time digital image based on data simulation in the construction of rural public space environment. Soft Computing. 2023. https://doi.org/10.1007/s00500-023-08376-6</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Non-contact optical dynamic measurements at different ranges: a review / Y. Fu [et al.] // Acta Mechanica Sinica. 2021. Vol. 37. P. 537–553. https://doi.org/10.1007/s10409-021-01102-1</mixed-citation><mixed-citation xml:lang="en">Fu Y., Shang Y., Hu W., Li B., Yu Q. Non-contact optical dynamic measurements at different ranges: a review. Acta Mechanica Sinica. 2021;37:537–553. https://doi.org/10.1007/s10409-021-01102-1</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Barten P. G. J. Spatiotemporal model for the contrast sensitivity of the human eye and its temporal aspects // Human Vision, Visual Processing, and Digital Display IV : Proc. SPIE1913 / San Jose, CA, United States: 1993. https://doi.org/10.1117/12.152690</mixed-citation><mixed-citation xml:lang="en">Barten P. G. J. Spatiotemporal model for the contrast sensitivity of the human eye and its temporal aspects. In: Human Vision, Visual Processing, and Digital Display IV: Proc. SPIE1913, San Jose, CA, United States. https://doi.org/10.1117/12.152690</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Saukova Y. The validation model of information measuring channel in technical vision systems // International Journal of Advanced Engineering and Technology. 2018. Vol. 1, № . 4. P. 28–33.</mixed-citation><mixed-citation xml:lang="en">Saukova Y. The validation model of information measuring channel in technical vision systems. International Journal of Advanced Engineering and Technology. 2018;1(4):28–33.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Фершильд М. Д. Модели цветового восприятия. Второе издание : пер. с англ. 2006.</mixed-citation><mixed-citation xml:lang="en">Fairchild M. D. Color appearance model. Second edition. 2006. (Russ. ed.: Fershil’d M. D. Modeli cvetovogo vospriyatiya. Vtoroe izdanie: per. s angl. (In Russ.)).</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Зуйков И. Е., Савкова Е. Н. Колориметрия с высоким пространственным разрешением // Приборы и методы измерений. 2013. № 1. С. 86–91.</mixed-citation><mixed-citation xml:lang="en">Zuikov I. E., Savkova E. N. The colorimetry with a high dimensional resolution. Devices and Methods of Measurements. 2013;(1):86–91. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Sutkowski M., Saukova Y. Extending of digital camera dynamic range on the Imaging Processing basis // Приборы и методы измерений. 2017. Т. 8, № 3. С. 271–278. https://doi.org/10.21122/2220-9506-2017-8-3-271-278</mixed-citation><mixed-citation xml:lang="en">Sutkowski M., Saukova Y. Extending of digital camera dynamic range on the Imaging Processing basis. Devices and Methods of Measurements. 2017;8(3):271–278. (In Russ.). https://doi.org/10.21122/2220-9506-2017-8-3-271-278</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Савкова Е. Н., Миргород Ю. С. Оптимизация параметров пиксельной графики по критерию минимума неопределенности // сборник тезисов докладов Международной научно-технической конференции Метрология – 2017 / под общ. ред. канд. техн. наук В. Л. Гуревича. Минск: БелГИМ, 2017. С. 90–94.</mixed-citation><mixed-citation xml:lang="en">Savkova E. N., Mirgorod Y. S. Optimization of pixel graphics parameters by the criterion of minimum uncertainty. In: Gurevich V. L. ed. Metrologiya – 2017: collection of abstracts of the International Scientific and Technical Conference. Minsk: BelGIM; 2017. P. 90–94. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Saukova Y., Matyush I. The metrological assurance of the colorimetry in software and hardware environments // International Journal of Innovative Research in Electronics and Communications (IJIREC). 2016. Vol. 3, Iss. 5. P. 6–19. http://dx.doi.org/10.20431/2349–4050.0305002</mixed-citation><mixed-citation xml:lang="en">Saukova Y., Matyush I. The metrological assurance of the colorimetry in software and hardware environments. International Journal of Innovative Research in Electronics and Communications (IJIREC). 2016;3(5):6–19. http://dx.doi.org/10.20431/2349-4050.0305002</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Эпштейн Н. А. Валидация аналитических методик: графические и расчетные критерии для оценки линейности методик на практике // Разработка и регистрация лекарственных средств. 2019. Т. 8, № 2. С. 122–130. https://doi.org/10.33380/2305-2066-2019-8-2-122-13023</mixed-citation><mixed-citation xml:lang="en">Epstein N. A. Validation of analytical techniques: graphical and computational criteria for evaluating the linearity of techniques in practice. Drug Development &amp; Registration. 2019;8(2):122–130. (In Russ.). https://doi.org/10.33380/2305-2066-2019-8-2-122-13023</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Эрмер Й., Миллер Д. Х. МакБ. Валидация методик в фармацевтическом анализе. Примеры наилучших практик: пер с англ. М. : Группа компаний ВИАЛЕК, 2013. 512 с.</mixed-citation><mixed-citation xml:lang="en">Ermer J., Miller D. H. Mak B. Method validation in pharmaceutical analysis. A Guide to best practice.– weinheim: Wiley-VCH Verlag GmbH &amp; Co. KGaA; 2005. 403 p. (Russ. ed.: Ermer J., Miller D. H. Mak B. Validaciya metodik v farmacevticheskom analize. Primery nailuchshih praktik : per. s angl. Moskow: Gruppa kompanij VIALEK; 2013. 512 p. (In Russ.)).</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Пригодность применения. Руководство для лабораторий по валидации методов и смежным вопросам ; под ред. Б. Магнуссона и У. Эрнемарка : перевод второго издания 2014 года. Киев : ООО Юрка Любченка, 2016. 96 с.</mixed-citation><mixed-citation xml:lang="en">Magnusson B., Örnemark U. (eds.) the fitness for purpose of analytical methods – A laboratory Guide to method validation and related topics. (Russ. ed.: Magnussona B., Ernemarka U. Prigodnost’ primeneniya. Rukovodstvo dlya laboratorij po validacii metodov i smezhnym voprosam. Kiev: OOO «Yurka Lyubchenka»; 2016. 96 p. (In Russ.)).</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Handbook of chemometrics and qualimetrics / D. L. Massart [et al.]. Part A. Amsterdam: Elsevier, 1997. 886 p.</mixed-citation><mixed-citation xml:lang="en">Massart D. L., Vandeginste B. G. M., Buydens L. M. C., De Jong S., Lewi P. J., Smeyers-Verbeke J. Handbook of chemometrics and qualimetrics. Part A. Amsterdam: Elsevier; 1997.</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Chemometrics in chromatography / L. Komsta [et al.]. Boca Raton: CRC Press, 2018. 506 p. https://doi.org/10.1201/9781315154404</mixed-citation><mixed-citation xml:lang="en">Komsta L., Heyden Y. V., Sherma J. eds. Chemometrics in chromatography. Boca Raton: CRC Press; 2018. 506 p. https://doi.org/10.1201/9781315154404</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Schanda J. Colorimetry. Understanding the CIE system. John Wiley &amp; SONS, INC., Publication, 2019. 500 p.</mixed-citation><mixed-citation xml:lang="en">Schanda J. Colorimetry. Understanding the CIE system. United States of America: John Wiley &amp; SONS, INC. Publication; 2019. 500 p.</mixed-citation></citation-alternatives></ref><ref id="cit28"><label>28</label><citation-alternatives><mixed-citation xml:lang="ru">Толковый словарь русского языка / С. И. Ожегов; под ред. проф. Л. И. Скворцова. 27-е изд., испр. М. : Издательство АСТ : Издательство Мир и образование, 2023. 393 с.</mixed-citation><mixed-citation xml:lang="en">Ozhegov S. I., Skvorcova L. I. ed. Explanatory dictionary of the Russian language. Moskow: Izdatel’stvo AST, Izdatel’stvo Mir i Obrazovanie; 2023. 393 p. (In Russ.).</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
