去斑后，采用基于阈值的直方图规定化方法，以弥补对比度可能降低情况。
After speckle reducing, a histogram defined method based on the threshold is employed to compensate for possible contrast reduction.
提出了二维属性直方图的概念，进而提出了一种基于二维属性直方图的图像自动阈值化方法。
The concept of the two-dimensional bound histogram is proposed, and an automatic threshold selection method based on that histogram is presented.
Otsu法是最常用的利用图象一维灰度直方图的阈值化方法之一，本文的目的是将它推广到二维直方图。
One of the most useful thresholding techniques using gray-level histogram of an image is the OTSU method. The objective of this paper is to extend it to the 2-dimensional histogram.
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