Degrees of freedom, and eigenfunctions, for the noisy image Bendinelli, M. ; Consortini, A. ; Ronchi, L. ; Frieden, B. Roy Abstract Publication: Journal of the Optical Society of America (1917-1983) Pub Date: November 1974 DOI: 10.1364/JOSA.64.001498 Bibcode: 1974JOSA...64.1498B