PyDigitizer – A Python module for digitizing 2D curves

The digitizing process consists of extracting a curve numerical coordinates from an explicit
image. The paper describes the PyDigitizer module for digitizing 2D curves from images,
created with the help of free and Open Source resources, using Python as a programming
language and wx.Python as a graphical user interface toolkit. Digitizing is done manually,
only for XY graphs type, by placing mouse points with left clicking over the curves in the
image. After digitization, spline interpolation curves can be plotted over the image curves,
their intersection points can be accurately calculated for specified X or Y values and the
coordinates of the digitized points can be displayed in tabular form; moreover, regression
digitized curves can be generated, the results can be exported to an Excel file or saved
in a dataset to be restored later.
It is also possible to open Excel files, with point coordinates of one or more curves,
to operate intersections for the X or Y axis. The Excel file layout is exemplified in the
file 'Demo_Chart.xls'.