Patent ID: 8340460

Claim:
A method of estimating an offset image of an unused imaging device from an offset image of said imaging device already aged, comprising: a. calculating the median value of all pixels in each row of an imaging device already aged; b. determining the minimum value of all medians of all rows of the imaging device already aged; and c. subtracting the difference of each rows median and the minimum median of all rows from each pixel in each row to receive a first estimation of the offset image of the unused imaging device; d. calculating the standard deviation of all pixels in each row which values are within a certain range related to the row's median value; e. determining the maximal standard deviation of all pixels which values are within a certain range related to the row's median value from such rows of lowest medians; and f. amplifying texture information along each row by dividing the difference of each pixel's value to the mean value of the pixel's neighborhood in the row by the ratio of standard deviations calculated in (d) and the maximal standard deviation as determined in (e) to receive a better estimation of the offset image of the unused imaging device.