data prepare error about document-image-binarization

[ajgallego]

Hi @justinner,

that error indicates that you are not loading the training images correctly. It is possible that the folder structure is not correct, check the "load_dataset_folds" function of the "train.py" file.

For example, to use Dibco 2016 as test set and Dibco 2009-2014 as training sets, you have to write:

python -u train.py -path datasets -db dibco -dbp 6 --aug -w 256 -s 128 -f 64 -k 5 -e 200 -b 10 -th -1 -stride 2 -page 64

Inside your folder you have to create a subfolder called "datasets", and inside this other one called "Dibco", like this:

• Dibco/2009/handwritten_GR
• Dibco/2009/printed_GR
• Dibco/2010/handwritten_GR
• Dibco/2011/handwritten_GR
• Dibco/2011/printed_GR
• Dibco/2012/handwritten_GR
• Dibco/2013/handwritten_GR
• Dibco/2013/printed_GR
• Dibco/2014/handwritten_GR,
• Dibco/2016/handwritten_GR

If you do not want to use augmented remove the "--aug" option from the command. If you want to use augmented files you have to create the same folders but using the prefix "aug_", for example, for Dibco 2009 it would be:

• Dibco/2009/aug_handwritten_GR
• Dibco/2009/aug_printed_GR

Remember also that the images have to be in PNG format.

Another important issue is that the input images and their corresponding ground truth must to have the same filename, for example, for the following training images of Dibco 2009:

• datasets/Dibco/2009/handwritten_GR/H01.png
• datasets/Dibco/2009/handwritten_GR/H02.png
• datasets/Dibco/2009/handwritten_GR/H03.png
• datasets/Dibco/2009/handwritten_GR/H04.png
• datasets/Dibco/2009/handwritten_GR/H05.png

We would have the following corresponding images of ground truth:

• datasets/Dibco/2009/handwritten_GT/H01.png
• datasets/Dibco/2009/handwritten_GT/H02.png
• datasets/Dibco/2009/handwritten_GT/H03.png
• datasets/Dibco/2009/handwritten_GT/H04.png
• datasets/Dibco/2009/handwritten_GT/H05.png