Stem whitespac$ (all stems)

2 papers:

ICDAR-2013-ChenYL #hybrid #performance #segmentation

Hybrid Page Segmentation with Efficient Whitespace Rectangles Extraction and Grouping (KC, FY, CLL), pp. 958–962.

ICDAR-2003-Breuel #algorithm #analysis #documentation #layout

An Algorithm for Finding Maximal Whitespace Rectangles at Arbitrary Orientations for Document Layout Analysis (TMB), pp. 66–70.