数字图像处理二值化程序
% KITTLERMET binarizes a gray scale image 'imag' into a binary image
% Input:
% imag: the gray scale image, with black foreground(0), and white
% background(255).
% Output:
% imagBW: the binary image of the gray scale image 'imag', with kittler's
% minimum error thresholding algorithm.
% Reference:
% J. Kittler and J. Illingworth. Minimum Error Thresholding. Pattern
% Recognition. 1986. 19(1):41-47
