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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。
Low contrast is one of the main features of the glimmer image, contrast enhancement is an important technical means of glimmer image enhancement processing. This paper describes in detail the basic principle of using gray-scale transform to improve the contrast. Based on analyzing the histogram distribution of glimmer images with different illuminance, a special gray-scale transfer function is established and the hardware circuit is designed and debugged. Achieve real-time processing of glimmering images. This method can be directly applied to the glimmer TV system, which can significantly improve the glimmer image quality.