Wellner 算法的原文文章，它是一种局部二值化方法，wellner以其高效，高质，广泛应用 于图像处理领域，通过测试它能处理高噪声的图像。-the paper for Wellner algorithom, it is the adaptive thresholding method, it work efficiently on the image with high noise. so it was used widly.