1. An optical tomographic imaging apparatus that is a polarization sensitive optical coherence tomography (OCT) (PS-OCT) for acquiring a 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 of adjacent pixels to acquire OCT data that are associated with polarimetric properties of the object, defined in spatial and/or temporal directions; define one of the pixels as a reference pixel: 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 between the reference pixel and each pixel without any artifact of birefringence.