Blind restoration of atmospherically degraded images by automatic best step-edge detection

Omri Shacham, Oren Haik, Yitzhak Yitzhaky

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Image restoration algorithms often require previous knowledge about the point spread function (PSF) of the disturbance. Deriving the PSF manually from a degraded ideal step-edge in the image is a well known procedure intended mainly for isotropic degradations. A common image degradation that can be approximated as isotropic is the atmospheric blurring in long-distance imaging. This paper proposes an efficient method that automatically finds the best (closest to ideal) step-edge from the degraded image. The identified PSF is then used to restore the image. The existence of a good step-edge in the image may be assumed in cases such as imaging of urban areas, which is common in applications such as visual surveillance and reconnaissance. The criteria employed include the straightness and length of the edge, its strength, and the homogeneity of the step. An efficient algorithm is proposed, and results of automatic blind image restoration based on the automatically extracted PSF are shown.

Original languageEnglish
Pages (from-to)2094-2103
Number of pages10
JournalPattern Recognition Letters
Volume28
Issue number15
DOIs
StatePublished - 1 Nov 2007

Keywords

  • Atmospheric blur
  • Blind image restoration
  • Blur identification
  • Step-edge detection

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