Patent ID: 9697620
Date: 2017-07-04
CPC Classifications: E21B,G01V,G03B,G06T

Claim:
1. A method for analysis of at least a portion of a geological formation intersected by a borehole, the method comprising the steps of: obtaining signals representative of the geological formation and generated by a logging sonde operated in the borehole to energize the geological formation; (a) modeling the signals as components of an input image in the form in which i(x, y) is the input image representative of the signals; l(x, y) denotes an illumination value of the input image at two-dimensional spatial co-ordinates x, y; and r(x, y) denotes a surface reflectance value at the co-ordinates x, y; (b) transforming Equation (1) to a logarithmic domain expression; (c) obtaining a Fourier transform of the resulting logarithmic domain expression to obtain a Fourier domain expression; (d) high-pass filtering the Fourier domain expression; (e) obtaining an inverse Fourier transform of the resulting filtered Fourier domain expression; (f) performing an exponential operation on the result of Step (e) to obtain a filtered image model expression; (g) mapping values of the filtered image model expression to respective color values across a range of the filtered image model expression values; and (h) creating one or more enhanced images by outputting the mapped color values.