An algorithm is proposed for generating subjective contours that are perceived in completely homogeneous regions. The algorithm is as follows : 1) detection of candidate points where subjective contours will pass, 2) determination of directions of possible subjective contours at each point, 3) determination of pairs of points to be filled in with subjective contours, 4) generation of subjective contours. Using this algorithm, subjective contours were successfully generated from several typical drawings. Furthermore, the algorithm was applied to synthetic line drawings where several polygons were overlapped one other without any visible inner contours. The algorithm could extract the inner contours and separate each component polygon.
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