TY CONF TI OPTIMIZATION OF THE VIOLA-JONES METHOD FOR FACE DETECTION USING IMAGE PREPROCESSING KW face detection KW Viola-Jones method KW image preprocessing KW Haar classifiers KW quality metrics JO MODELING INFORMATION SYSTEMS AND TECHNOLOGIES – 2026 AU Ptashnik, R.O. AU Antsiferova, V.I. AU Chirkin, N.A. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov