本文介绍图象处理增强技术中的直方图均衡和直方图展平。提出了实现直方图展平计算机处理的二次排队法的详细数学模型。编写了直方图均衡法和直方图展平二次排队法的ALGOL语言程序,对飞机遥感照片进行了计算机处理。经过处理,照片的对比度得到了明显的增强。 This article describes histogram equalization and histogram flattening in image enhancement techniques. A detailed mathematical model of secondary queuing method for computer processing histogram flattening is proposed. The ALGOL language program of histogram equalization method and histogram flattening second order method was written and the remote sensing photos of the aircraft were processed by computer. After processing, the contrast of photos has been significantly enhanced.