OHG

cBAD Dataset

See.

The manuscript Oficio de Hipotecas de Girona (OHG) is pro- vided by the Centre de Recerca d’Història Rural from the Universitat de Girona (CRHR) V . This collection is composed of hundreds of thousands of notarial deeds from the XVIII- XIX century (1768-1862). Sales, redemption of censuses, inheritance and matrimonial chapters are among the most common documentary typologies in the collection. This collection is divided in batches of 50 pages each, digitized at 300ppi in 24 bit RGB color, available as TIF images along with their respective ground-truth layout in PAGE XML format, compiled by the HTR group of the PRHLT VI center and CRHR. OHG pages are structured in a complex layout composed of six different zone types, namely: $pag, $tip, $par, $pac, $not, $nop;

The dataset is divided randomly into training and test set, 300 pages and 50 pages respectively. Experiments are conducted on incremental subsets from 16 to 300 training images, for Baseline detection only and integrated for baseline and zone segmentation .

Usage:

./run.sh

• See config for details about training parameters for "Baselines detection only" experiments.
• See config for details about training parameters for "Balelines + zone segmentation" experiments.

Dataset size is ~10.5GB, make sure to have at least 26GB of free disk space to store all the experiments (12 in total).

Results

Baseline Experiments Metrics

Experiment	P	R	F1
	BL only
16	93.3	96.0	96.1
32	96.2	95.3	95.7
64	97.5	97.4	97.5
128	98.0	97.6	97.8
256	98.2	98.0	98.1
300	98.4	97.7	98.0
	BL + ZS
16	81.4	92.5	86.2
32	79.6	95.0	86.0
64	91.8	95.8	93.4
128	94.8	96.4	95.5
256	93.3	96.4	94.4
300	96.2	97.1	96.5

Zone Segmentation Metrics

Experiment	Pixel Acc.	Mean Acc.	Mean IU	Freq. IU
16	81.7	68.4	58.9	77.2
32	81.1	68.5	57.8	74.7
64	91.7	80.2	70.0	87.6
128	95.1	84.5	76.0	91.8
256	91.4	78.9	72.7	87.2
300	92.4	86.9	76.3	88.7