Patent ID: 6714674
Filing Date: 2004-03-30
Classification: A61B,G06T

Abstract:
A method for converting digitized image pixel values from a first range to a second range, the method comprising the steps of:(a) determining a lower limit value of a relevant portion of the first range based upon non-log transformed pixel values; (b) generating an intensity histogram representative of pixel populations having specified intensities, and transforming the histogram to generate a log-transformed histogram; (c) identifying a threshold value for an upper limit of log-transformed values from the log-transformed histogram; (d) identifying a population of pixels having log-transformed values having a desired relationship to the threshold value; (e) determining an upper limit value of the relevant portion of the first range based upon the identified population; and (f) converting the non-log transformed pixel values to converted values over the second range based upon the lower and upper limit values.