Probabilistic Model-Based Restoration of Short-Exposure Astronomical Images
نویسندگان
چکیده
We present a novel multiimage restoration method based on the underlying spatial probabilistic image model for astronomical image restoration if degradation obeys a linear degradation model with the unknown possibly nonhomogeneous point-spread function. The method assumes that for every ideal undegraded unobservable image several degraded observed images are available. Pixels in the vicinity of image steep discontinuities are left unrestored to minimise restoration blurring effect. The degraded image is assumed to follow a causal simultaneous multidimensional regressive model which leads to an adaptive fast recursive restoration filter. The unknown point-spread function is estimated using the local least-square estimate.
منابع مشابه
Multichannel Blind Deconvolution of the Short-Exposure Astronomical Images
In this paper we present a new multichannel blind deconvolution method based on so-called subspace technique that was originally proposed by Harikumar and Bresler. When at least two differently degraded images (channels) of the original scene are provided, the method is better conditioned than classical single channel ones. In comparison with earlier multichannel blind deconvolution techniques ...
متن کاملImage Models and Their Role in ImageProcessing
Over the last few years an enormous amount of research has been devoted to restore astronomical images, but not much work has been reported on the use of multichannel techniques to restore such images. In this work, we rst brieey summarize the research carried out on image restoration within the Converging Computing Methodologies network and then concentrate on the multichannel image restoratio...
متن کاملEmerging trends of optical interferometry in astronomy
The current status of the high spatial resolution imaging interferometry in optical astronomy is reviewed in the light of theoretical explanation, as well as of experimental constraints that exist in the present day technology. The basic mathematical interlude pertinent to the interferometric technique and its applications in astronomical observations using both single aperture, as well as dilu...
متن کاملFusion of Astronomical Multiband Images on a Markovian quadtree
Over the last few years, an enormous amount of studies has been devoted to astronomical image restoration. The new challenge, nowadays, has been reported on the use of multichannel techniques to restore, segment and classify such images. The multichannel image segmentation problem, is a new field of great interest for the astronomical community. This paper presents an unsupervised method to aut...
متن کاملAstronomical image restoration using an improved anisotropic diffusion
Images secured from an astronomical telescope usually suffer from blur and from interference that scientists refer to as ‘‘noise’’. Therefore, good image restoration technique has become an important tool in astronomical observation. In this paper, we propose a modified anisotropic diffusion scheme to tackle the problem of image restoration in astronomy, especially in the case of nebula images....
متن کامل