Hao Feng 0009 Yuechen Wang Wengang Zhou 0001 Jiajun Deng Houqiang Li DocTr: Document Image Transformer for Geometric Unwarping and Illumination Correction. 273-281 2021 ACM Multimedia https://doi.org/10.1145/3474085.3475388 conf/mm/2021 db/conf/mm/mm2021.html#FengWZDL21