bboxToDF: Utility Function for Manipulating Bounding Box Collection

In duncantl/Rtesseract: Interface to the tesseract OCR system

Utility Function for Manipulating Bounding Box Collection

Description

We typically return the bounding boxes of the elements recognized by tesseract on an image as a matrix, with the text for each element in the rownames. A data frame would not allow duplicate text as row names. The bboxToDF function converts the matrix version to a data frame, adding the text as a 5th column.

It can be useful to have the bounding boxes as a data frame when we split the rows based on some criteria.

orderBBox is a convenient function for easily ensuring the rows in a bounding box are arranged from left to right or top to bottom or vice versa. This is a simple version of bbox[ order(bbox[, col], decreasing = TRUE/FALSE), ]

Usage

bboxToDF(bb)
orderBBox(bbox, colName = "bottom", decreasing = TRUE) 

Arguments

bb	the bounding box as a matrix
bbox	the bounding box as a matrix or data.frame
colName	the name or index/positio of the column of the bounding box to order the rows by.
decreasing	a logical value controlling whether the rows are odered by the values in colName in decreasing or increasing order.

Value

bboxToDF returns a data frame with the text for each bounding box in a 5th column named text.

orderBBox returns the same object as its input, but in different row order.

Author(s)

Duncan Temple Lang

See Also

GetBoxes

duncantl/Rtesseract documentation built on March 25, 2022, 5:50 a.m.