中文摘要：

一种基于亮度均衡化的图像阈值分割算法被提出．该算法将冰凌图像亮度数据均衡化，以类间方差最大为标准，求得最佳阈值，并将冰凌图像转化为二值图像，通过冰凌像素统计，最终确定冰凌密度．该算法被应用于黄河河道冰凌图像密度的计算中，取得较好的效果．

英文摘要：

An image thresholding segmentation algorithm based on brightness equalization is presented in this paper. By analyzing the ice image, the image brightness is equalized, and according to the Otsu, the optimal threshold is obtained and the ice image is transferred into binary image. And at last, by means of statisticing the ice slush pixels, the ice density is calculated. The algorithm is used in the calculation of the ice density of Yellow River and achieves better effect.