Starting from the definition for a set of ordered elements, the area histogram has been extended to analysis gray -level image through the notions of image thresholding decomposition and level sets.
从为有序元素集定义面积直方图出发，通过图像的阀值分解及层集等概念，面积直方图被扩展到了灰度图像。
2
Therefore, when applying a thresholding algorithm to an image, we generally assume that the background and target in that image occupy different graylevel zone.
传统的阈值化算法仅仅使用像素点的灰度级信息，因而要求图像中的目标和背景在灰度级上是可分的。
3
It solves the difficulty in binarization due to graylevel confusion between local background and image by automatic thresholding with local image enhancement.