Annotations for topographic maps, map symbols. In maps of residential areas, large tables, etc., there may be cases where several thousand to tens of thousands of paragraphs are required.
In OCR libraries, unlimited paragraphs can be created as long as memory allows.
The following example shows symbol recognition on a topographic map with contour lines and map symbols. Recognition of approximately ten thousand map symbols from a map larger than A0 is completed in 2 to 5 seconds (depending on CPU speed).
In the demo below, there were about 200 missed map symbols, but the recognition rate was 100.00%.