Global Wheat Head Dataset 2021: an update to improve the benchmarking wheat head localization with more diversity. - Etienne David; Mario Serouart; Daniel Smith; Simon Madec; Kaaviya Velumani; Shouyang Liu; Xu Wang; Francisco Pinto Espinosa; Shahameh Shafiee; Izzat S. A. Tahir; Hisashi Tsujimoto; Shuhei Nasuda; et al. (CoRR, 2021)