image_textlines_astar   Text Line Segmentation based on the A* Path
                        Planning Algorithm
image_textlines_crop    Crop an image to extract only the region
                        containing text
image_textlines_flor    Text Line Segmentation based on valley finding
                        in projection profiles
image_wordsegmentation
                        Find Words by Connected Components Labelling
lines.textlines         Extract the polygons of the textlines
