TY JOUR TI THEORETICAL BACKGROUND OF THE SOLUTIONS OF TASKS OF DIGITAL PROCESSING OF GRAPHIC IMAGES REPRESENTED BY SCALAR FIELDS KW digital image KW scalar field KW the Green's function KW the Laplacian KW the Helmholtz equations KW Lame vector equation JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Buinevich, M.V. AU Maslakov, M.D. AU Boltov, Y.F. PY 2016 IS 2016 PB Saint-Petersburg University of State Fire Service of Emercom of Russia