Pore-morphology-based pore structure characterization for various porous media

•A pore-morphology-based pore structure characterization method is proposed for various porous media.•Mercury injection and gas pore condensation are simulated in CT images of porous media.•The algorithm is designed in several ways with an improved computational efficiency and characterization accuracy.•The algorithm is user-friendly and can be applied on 2D and 3D images.•The obtained pore structure characteristics are physically realistic.