A digitizer tool for automatic extraction of graphical information and its conversion to digitized form.
- Axis segmentation
- finding x-axis and y-axis using horizontal and vertical sobel filters
- Label recognition
- Auto-detecting label numbers with OCR
- Assign values
- Assign data values to the ends of x-axis and y-axis by finding label box center
- Symbol recognition
- user manually circles the targeted symbol
- extract the symbol from the drawing area
- slightly erode the selected symbol,
- erode plot with extracted symbol
- Line recognition
`* crop image to remove tick marks
- find linearly spaced columns at desired resolution
- threshold and search for nonzero values along each column
