METHOD AND DEVICE FOR REMOVING RULED LINE

摘要

PROBLEM TO BE SOLVED: To remove a ruled line at high speed and to restore a character part erased together at high speed by detecting the black run of a lateral ruled line and storing it as a run length table for each longitudinal position. SOLUTION: The black run is detected from an image area and for each longitudinal position of the detected black run, the run length table composed of a lateral starting point and a length from the starting point is prepared (S1). The black run of the length equal to or greater than a threshold value is selected and removed from an image (S2). Residual noise with the mark of the ruled line is erased (S3). Two components having possibility to be longitudinally divided by removal are simply coupled (S4). The erased black run is reproduced on the image in the same size as an input image (S5). ANDed for each pixel and only the erased character part overlapped with the ruled line is left (S6). The ruled line removed image and the erased black pixel in the character part are ORed for each pixel and synthesized and a part erased together with the ruled line is restored (S7).