Patent ID: 8542945
Filing Date: 2013-09-24
Classification: G06K,G06T

Abstract:
1. A method for correcting mis-focus of an image, the method comprising: receiving an image file at a numerical processor, the image file comprising a portion of the image in an original mis-focused condition; selecting a numerical value for a variable α; beginning a first iteration of a numerical procedure executing on the numerical processor; in the numerical procedure, applying a two-dimensional centered discrete fractional Fourier transform operator of power α to the image file and applying a phase correction operator associated with the two-dimensional centered discrete fractional Fourier transform matrix of power β−α to the image file; obtaining a modified portion of the image file from the above operations; inspecting the modified portion of the image file and determining a change in the mis-focused condition; based on the determined change, adjusting numerical value of α; and beginning a next iteration of the numerical procedure on the numerical processor; wherein if numerical values for the variable α between the real values of 0 and β do not result in a desired outcome, the numerical value for the variable α is adjusted to an imaginary value of the form iχ where χ is the imaginary part of α.