RelGrid

typedef struct RelGrid_tag { 
  long grid;                
  long subgrid_count;      
  long left, top;          
  long width, height;
} RelGrid;

Elements:

grid
If a given image contains lines, boxes, or combs that have to be removed during segmentation and before recognition, an area of data structures RelGridParm has to be provided. The address of this area has to be set to gridparm in the structure ReParm. In the same structure, gridparm_maxlen has to be set to the dimension of the area under gridparm, measured in data structures RelGridParm. In every of these structures under gridparm the item grid has to be set to the type of the searched grid object (GRID_LINE_H, GRID_BOX,..). No more than one such type must be specified in a grid item. If less than gridparm_maxlen items are needed, the first unused structure has to be marked with GRID_END at the item grid.
If lines- or box-removal is switched on and grid items have been detected, and memory is provided for the results (rel_grid_maxlen 0), then the grid detection results are provided in a data structure RelGrid. For every elements is in this structure under grid the specification of GRID_LINE_H, GRID_LINE_V, GRID_BOX or GRID_COMB. Under left, top, width and height the position of the given image as a rectangle is delivered.
The following grid items are defined:
GRID_LINE_HHorizontale Linie.
GRID_LINE_VVertikale Linie.
GRID_BOXKästchen um ein oder mehrere Zeichen.
GRID_COMBKamm mit Zeichen.
GRID_ALLAlle Grid-Elemente.
GRID_ENDEnde der Liste gridparm.
subgrid_count
Numbers of subboxes of boxes and comb fields.
left, top
Coordinates of the left, upper corner of a grid item.
width, height
Width and height of a grid item.

Reference: