为克服夜视设备产生单色图像的缺陷,得到更符合人眼视觉的彩色夜视图像.根据RGB理论模型以及滤光片的分谱作用原理,基于第二代像增强器设计出一种彩色夜视方案,通过测量滤光片的光谱透过率,得出滤光片对像增强器信噪比的影响;提出利用全波图像的四帧融合解决像增强器信噪比低的问题,并进行实验验证.实验结果显示室内和室外情况下四帧融合彩色图像熵和方差分别达到6.8、35.39及7.0、45.07,均优于三帧融合时对应值,说明提出的四帧融合方法能够克服信噪比降低的缺陷,得到清晰且信息量丰富的夜视图像.

In order to overcome the defect that low-night vision device generates monochrome images and to get visual color images more consistent with human eyes,according to the red-green-blue(RGB)color model and spectral separation principle of filters,a system of color night vision based on the second-generation image intensifier was designed.Through measuring the spectral transmittance of filter,the impact of filter on the signal to noise ratio(SNR)of image intensifier was educed.According to the low SNR problem,a four-frame fused method of full-wave image was proposed and verified by experiments .The experimental results show that the entropy and variance of chamber image are 6.8 and 35.39,respectively,and that of outdoor image are 7.0,45.07,respectively,which are all better than the corresponding values of three-frame fused image.The result proves that the method presented is able to overcome the defect of low SNR,and get clearer color night vision image with more details.