Requirements
Python + the following packages: numpy, opencv, scipy, pillow
Usage
You need the files: putzmain.py, putzlib.py and pbarrs.npz in a single directory.
For a single chessboard image:
python -m putzmain.py -f imagefile -o output txt file
For a directory of images:
python -m putzmain.py -d imagedirectory -o output txt file
If no output file is specified, output is written to fens.txt (overwritten if it exists!). In the first case output is a single line with the FEN position. In the second, it is written as line1: filename line 2: FEN... for each of the file(s) in the directory.
Notes: Opencv is (finally!) easy to install via conda or pip. The functions needed from scipy and pillow (Python Imaging library) have equivalents in opencv, so folding them in is on the todo list.