Patent ID: 7336826

Claim:
A method for finding a threshold value in image segmentation, the method comprising the steps of: a) gaining histogram distribution of an image; b) computing entropy values corresponding to gray levels in the histogram; and c) gaining a minimum entropy value corresponding to the gray level as the threshold value by using a fixed point interation FPI based on the computed entropy values, wherein the step c) includes the steps of: c-1) obtaining a plurality of possible optimal thresholds, c-2) obtaining entropy values of gray levels corresponding to the obtained possible optimal thresholds, and c-3) obtaining the threshold value by comparing entropy values and selecting minimum entropy value, wherein each of the possible optimal thresholds is obtained by obtaining a value of possible maximum gray level having maximum entropy value, a value of possible minimum gray level having minimum entropy value and obtaining possible optimal threshold by adding two values of the possible maximum gray level and the possible minimum gray level and dividing the sum of addition by half.