Improve segmentation accuracy i.e. far less overlapping or cutting off text

[eamonniknafs]

Hey @chasem151, does this story have code changes associated, or is it just research?

[chasem151]

It adds a new expand_boxes2 function which performs mean thresholding for some better segmentation results via x and y margin added or subtracted borders when an x/y coordinate is >=/< its x/y mean. Left is new. @eamonniknafs