Image processing for plots detection from ancient maps



Morphological operators can be applied on grayscale images to filter out some objects or conversely to emphasize some objects. Therefore, by choosing an appropriate structuring element, it is possible to eliminate some elements of a map like text and to reconstruct discontinuous lines. A filter bench has been defined to extract from images of ancient maps the thin lines whatever their orientation, that isthe plot boundaries. On the resulting images, a watershed algorithm can afterwards segment the plots. Moreoverapplying a "seam carving" algorithm as pre-processing removes grid lines when needed.