Multi-scale deep learning for estimating horizontal velocity fields on the solar surfaceRyohtaroh T. Ishikawa, Motoki Nakata, Yukio Katsukawa, Youhei Masada and Tino L. RiethmüllerA&A, 658 (2022) A142DOI: https://doi.org/10.1051/0004-6361/202141743