Abstract: This paper presents a new grey-level mapping law for direct histogram specification, interval mapping law(IML). This law is based on the classical single mapping law (SML) and group mapping law (GML). By analyzing an example of the general equalization, IML draws forth the iso-interval mapping law (IIME), a method of direct histogram equalization. In the end, data analysis from the experiment proves the superiority of IML and IIME.

Key words: Histogram specification, Histogram equalization, Mapping law, Interval mapping law, Iso-interval mapping equalization

摘要： 在经典的单映射规则SML和组映射规则GML的基础上，提出一种新的映射规则——区间映射规则(IML)，并提出基于IML的数字图像直方图规定化方法。以8阶灰度直方图为例，通过对常用均衡化方法的实例分析，引出基于IML的直方图均衡化方法——等区间映射均衡化(IIME)。用实验数据分析和证明了IML和IIME的优越性。

关键词: 直方图规定化, 直方图均衡化, 映射规则, 区间映射规则, 等区间映射均衡化