Patent ID: 7133558

Claim:
A table image processing device comprising: a unit inputting an image comprising a sheet image including ruled lines; a unit extracting a line by extracting a longitudinal line and a lateral line from the input image; a unit finding a potential match of a round corner region by extracting an oblique line which commences from a terminal of a line found by the line extracting unit, and finding a potential match of the round corner region based on the oblique line; a unit extracting a cell finding cells containing the potential match of the round corner found by the potential match of the round corner region finding unit; and a unit deciding a round corner part decides a round corner based on the cells found by the cell extracting unit; wherein the unit finding the potential match of the round corner region extracts the oblique element by extracting a first oblique element commencing from a terminal of a longitudinal line, and a second oblique element commencing from a terminal of a lateral line, and the unit finding the potential match of the round corner region decides, in a case that the first oblique element and the second oblique element overlap, the part as the potential match of the round corner, even when at least one of the first and the second oblique elements are unclear; and the unit deciding a round corner part decides the part as the round corner in a case that the pixel density at a corner of a cell extracted by the unit extracting the cell changes in a fixed order of low density-high density-low density from outside of the corner area.