This dataset is named MSBin which stands for MultiSpectral Document Binarization. The dataset is dedicated to the (document image) binarization of multispectral images. A description of the dataset is given at https://github.com/hollaus/msbin.
The dataset is introduced in:
Fabian Hollaus, Simon Brenner, Robert Sablatnig:
CNN Based Binarization of MultiSpectral Document Images. ICDAR 2019: 533-538