The phase-gradient algorithm (PG) determines the phase of a stellar object's spatial spectrum by estimating the derivatives of the phase directly from the speckle images, and then integrating. A photon-address version of the PG has been successfully implemented for use at very low light levels. Computation of image-domain, cross-correlation functions is simply a matter of generating the 2D histograms of address differences, and bias terms are eliminated by omitting all photon self-correlation products. In a series of comparisons with a photon-address, Knox-Thompson algorithm, PG proved to have greater computational efficiency, to be more robust and to yield images with lower noise.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Phase-Gradient Speckle-Image Reconstruction: Discrete-Photon Case


    Beteiligte:
    Aitken, G. J. (Autor:in) / Johnson, R. (Autor:in)

    Kongress:

    Digital Image Recovery and Synthesis ; 1986 ; San Diego,CA,United States


    Erschienen in:

    Erscheinungsdatum :

    1988-01-29





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Photon Bias Compensation in Speckle Interferometry and Speckle Masking

    Kerp, J. / Barth, W. / Hofmann, K.-H. et al. | British Library Conference Proceedings | 1992


    A Photon-Counting Method for Speckle Imaging

    Mauder, M. / Weigelt, G. / European Southern Observatory | British Library Conference Proceedings | 1992


    Reconstruction of objects from simulated photon-limited stellar speckle data using the exponential filtering method

    Black, J. V. / Walker, J. G. / Institute of Physics; Applied Optics Division et al. | British Library Conference Proceedings | 1990


    On the Possibility of Speckle Image Reconstruction in Space Domain from Joint Representations

    Perez-Rendon, A. F. / Fuensalida, J. J. / European Southern Observatory | British Library Conference Proceedings | 1992


    High-Resolution Astronomical Imaging By Photon-Counting Speckle Masking

    Schertl, D. / Fleischmann, F. / Hofmann, K.-H. et al. | SPIE | 1987