1. An optical tomographic imaging apparatus that is a polarization sensitive OCT (PS-OCT) for acquiring Jones matrix representing polarization characteristics of at least one object to be inspected, the apparatus comprising at least one processing unit configured to: set a predetermined kernel to OCT data that are associated with polarimetric properties of the object, defined in spatial and/or temporal directions; and model the Jones matrix of each pixel in the set predetermined kernel by using one or more unitary matrices to obtain a relative global phase of each pixel.