1. An image processing device comprising: a data continuity detector configured to detect data continuity of image data made up of a plurality of pixels acquired by light signals of a real world being cast upon a plurality of detecting elements each having spatio-temporal integration effects, of which a part of continuity of the light signals of the real world have been lost; and a real world estimating unit configured to generate a gradient of pixel values of the plurality of pixels corresponding to a position in one dimensional direction of spatio-temporal directions as to pixels of interest within said image data, corresponding to the continuity detected by said image data continuity detector.