Efficient generalized cross-validation with applications to parametric image restoration and resolution enhancement

  • Authors:
  • N. Nguyen;P. Milanfar;G. Golub

  • Affiliations:
  • Sci. Comput. & Comput. Math Program, Stanford Univ., CA;-;-

  • Venue:
  • IEEE Transactions on Image Processing
  • Year:
  • 2001

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Abstract

In many image restoration/resolution enhancement applications, the blurring process, i.e., point spread function (PSF) of the imaging system, is not known or is known only to within a set of parameters. We estimate these PSF parameters for this ill-posed class of inverse problem from raw data, along with the regularization parameters required to stabilize the solution, using the generalized cross-validation method (GCV). We propose efficient approximation techniques based on the Lanczos algorithm and Gauss quadrature theory, reducing the computational complexity of the GCV. Data-driven PSF and regularization parameter estimation experiments with synthetic and real image sequences are presented to demonstrate the effectiveness and robustness of our method