AUTHOR=Dufaux Frédéric TITLE=Grand Challenges in Image Processing JOURNAL=Frontiers in Signal Processing VOLUME=1 YEAR=2021 URL=https://www.frontiersin.org/journals/signal-processing/articles/10.3389/frsip.2021.675547 DOI=10.3389/frsip.2021.675547 ISSN=2673-8198