We report an attempt to extract the pore structure of activated carbon from transmission electron microscopy (TEM) images. We have tried to use TEM of coconut-shell-based activated carbons, combined with image analysis, in order to make TEM a quantitative technique. It is important that the pore boundaries are clarified to analyze the pore structure, but extraction of the edges of pores is difficult by conventional techniques. In this work, we attempted to extract of the pore boundaries of the activated carbons by using fuzzy template obtained from a notion of a fuzzy topology.