Neutron imaging has been widely used for internal inspections of products and for research and developments in mechanical and chemical engineering, architecture, and agriculture. Nevertheless, the industrial products requiring internal inspection may exceed the penetration capability of thermal neutron imaging. In such cases, MeV neutron imaging would be an optimal candidate for observing their interior because it may usually have higher penetration capability. In this study, an experimental study of the MeV neutron imaging at RADEN in J-PARC MLF was conducted using some representative metallic and hydrogenous materials. Additionally, Monte Carlo simulations were performed using PHITS to complement the experimental data. The transmissions in the MeV neutron imaging exhibited an ideal exponential decrease with the object thickness for any materials used in the experiment, which enables us to yield an accurate quantification of the thickness distribution of the object from the transmission images. The deposition energy evaluations in the scintillators obtained from the numerical simulations confirmed less impact of the scattered and moderated neutrons on the plastic scintillator, which is agreed with the transmission dependence on the material thickness by the experiments and simulations. As a result, it was confirmed that the MeV neutron imaging at RADEN has a significant advantage on the accurate quantification of a thick object including metallic and hydrogenous materials.