一般来说，一幅图像能决定一种含义 的灰度直方图（gray level histogram），但是，由于直方图中只考虑了各个像素的灰度值， 而未考虑每个像素的几何位置，也就是说，失去了图像具有的空间信息。
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gray-level histogram equalization 灰度直方图均衡
gray-level histogram 明暗度分布图
d-gray level histogram 二维灰度直方图
image gray-level histogram 图像的灰度直方图
linked gray-level histogram 链表灰度直方图
Two-dimensional gray-level histogram 二维灰度直方图
The threshold methods of image segmentation are surveyed in this article, especially those based on the gray level histogram.
本文对现有的各种图像阈值分割方法进行综述，重点介绍了基于图像灰度直方图的阈值分割方法。
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。
The general theories of gray correction methods for the medical ultrasonic image are introduced in this paper, including gray level correction, gray level transformation and histogram correction.
介绍了超声医学图像灰度校正常用方法的基本原理，这些方法主要有灰度级校正、灰度变换及直方图修正。
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