[en] An analysis of real-time neutron images, taken with the cyclotron-based neutron radiography system of Sumitomo Heavy Industries, Ltd., which uses a set of neutron-photon converter, LiF + ZnS (Ag) scintillation screen, and a high sensitive SIT television camera, is described. The fluctuation of image intensity at a constant neutron flux domain is well represented by a Poisson distribution and ripple noise appearing in the real-time image can be attributed to the deficiency of neutron flux. The image integration technique, therefore, would be effective for improvement of the statistical quality of neutron image. Some digital image processing techniques based on statistical method would be effective for a ruffled image like real-time neutron radiography. (author)