A Contour/Grid Conversion Method by Using Local Smoothing Filter.
Jaeyeon Lee, Kiyonari Fukue, Haruhisa Shimoda, Toshibumi Sakata · Journal of the Japan society of photogrammetry and remote sensing · 1995
A new contour/grid conversion method is proposed which is based on smoothing filter.By applying the smoothing filter to the contour image repeatedly, the image is gradually changed to target grid data.The implementation of this algorithm is extremely simple, because the algorithm only requires 3•~3 masking 1.