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Table 1 Per page word block parameters symbols and their definitions

From: Layout-aware text extraction from full-text PDF of scientific articles

Parameter Symbols Definitions
w height Word block height
δw horizontal Horizontal space between words
δw vertical Vertical space between words
max i f (δw height ) Most Popular Word block height in a page i
max i f (δw horizontal ) Most Popular Horizontal space between word blocks in a page i
max i f (δw vertical ) Most Popular Vertical space between word blocks in a page i
ϕ EW = maxi f (δw height ) + maxi f (δw horizontal ) east–west word block expansion parameters in page
ϕ NS = maxi f (δw height ) + maxi f (δw vertical ) north–south word block expansion parameters in page