The latest scientific publication by project INDIGO is out:
Wild, B., Verhoeven, G. J., Wieser, M., Ressl, C., Schlegel, J., Wogrin, S., Otepka-Schremmer, J., & Pfeifer, N., 2022. AUTOGRAF—Automated Orthorectification of GRAFfiti Photos. Heritage, 5(4), 2987–3009. DOI: 10.3390/heritage5040155
The text – published in the open-access journal Heritage – details the AUTOGRAF software that was developed to geometrically process the thousands of images we acquire weekly. The paper can be found here, while the source code of AUTOGRAF is available here.