微光图像实时对比度增强处理

对比度低是微光图像主要特征之一，对比度扩展是微光图像增强处理的重要技术手段。该文详细叙述了采用灰度变换方法提高对比度的基本原理，在分析不同照度下微光图像直方图分布的基础上，建立了专门的灰度变换函数，并完成了硬件电路的设计与调试，实现微光图像的实时处理。该方法可直接应用于微光电视系统，能够显著地提高微光图像质量。

Real time Contrast Stretching in Low light level Image Processing

Low contrast is one of the main characteristics of the low light level image, and contrast stretching is the important technical method to enhance the image. In this paper, the basic principle of realizing contrast stretching by grey level transforming is described in detail. By analysing the histogram of low light level image in different illuminance, the special grey level transforming function is established and the development of the circuit is finished, so the real time processing of the low light level image is realized. In low light level television system, this method can be used directly and the quality of the image can be improved greatly.