Determination of the melanin and anthocyanin content in barley grains by digital image analysis using machine learning methods E.G. Komyshev, M.A. Genaev, I.D. Busov, M.V. Kozhekin, N.V. Artemenko, A.Y. Glagoleva, V.S. Koval, D.A. Afonnikov Vavilov journal of genetics and breeding, 2023