Ruled line decision manner and character recognition device

摘要

PURPOSE:To accurately decide ruled lines from a table type document whose format is not fixed by applying normal histogram to a line decided as a temporary ruled line candidate to decide the ruled line and converting a line decided as a real ruled line from the temporary ruled line candidate into a ruled line candidate. CONSTITUTION:A normal histogram is formed from a table type document image. Then, an OR image based upon the OR data of black picture elements of two picture elements having the same positional coordinates in the ruled line direction coordinates of two continuous lines is formed and the number of black picture elements on each line is counted up by means of the OR image to form an OR histogram. The normal histogram is furthermore applied to a line decided as a temporary ruled line candidate to decide the probability of the ruled line and the line decided as a real ruled line is set up as the final ruled line candidate. Even in a table type document whose format is not fixed, the ruled lines can be accurately recognized and accurate character recognition can be attained.