Patent attributes
If a rectangular area extracted from image data is smaller than a predetermined size, the rectangular area is judged as a text area. If a rectangular area has ground pixel rate of no less than 66%, labeling pixel rate of less than 67%, and marginal pixel rate of no less than 50%, the rectangular area is judged as a large text area, and otherwise as a ground area. If a rectangular area having no less than 10 straight lines, or both no less than four straight lines and labeling pixel rate of no more than 12%, has an edge pixel rate of no less than 5%, the rectangular area is judged as a table area, and otherwise as a graph area. If a rectangular area has less than four straight lines or labeling pixel rate of greater than 12%, the rectangular area is judged as a photograph area.
