Radiometry of quasi-homogeneous sources and Wigner radiometry

The radiometry of quasi-homogeneous sources is derived from the theory of partial coherence by using properties of the Wigner definition function. Suggested is the linear-system approach to the process of forming an optical image in which the convolution operator is used twice. First to describe influence of aberrations of an optical system on the image quality. Second to describe influence of the radiation pattern of the source-object and the form and the size of the entrance pupil on the fall-off of the irradiance from centre of the image plane to its edge.