The OCR-D structure Ground Truth corpus contains publications from the period 1500 to 1900.
The content of the corpus is based on manually entered zoning data, which were compiled in the course of the DFG project German Text Archive. This data was used to support manual transcription using the double keying method. The zones mark exclusively quadratic regions on the digital copy. The digital copies themselves were not altered (cropped, dewarped). In contrast to the element repertoire of the PAGE format, parts of the data were indexed more deeply as part of the DFG project German Text Archive. This in-depth indexing is recorded as the value of the custom-Atribut.