| 摘要 |
PURPOSE:To eliminate a gap produced between patches and to ensure such a fact that a free curved surface undergone the shadow processing seems to be a curved surface having the natural shadow, by obtaining a segmenting patch by enlarging a patch and segmenting a triangular unit area to perform the shadow processing. CONSTITUTION:Many triangular unit areas UA are segmented from a segmenting patch S(u,v)c obtained by enlarging a patch S(u,v) by a prescribed rate. Then the luminance information on the pixel included in the area UA to give shadow to a free curved surface based on the luminance information on the positions of three apexes of the area UA. An overlap area is produced at the boundary part between patches S(u,v)c adjacent to each other. Therefore a fact that a gap is produced between adjacent patches can be effectively avoided even though the patch S(u,v)c is segmented to the area UA and the shadow processing is applied to this area UA. |
