Variational Level Set Method for Two-Stage Image Segmentation Based on Morphological Gradients

Algorithm 1

Image transition region extraction.

 Input: Data and grayscale structuring element .

 Processing:  (1) Compute the morphological gradients of the data according to (3);

        (2) Design the following threshold for the transition region extraction;

             with

        (3) Extract the transition region TR via the following way:

             ;

Output: the mean of transition region for TR.