In the period of continuous progress of low-light and infrared technologies, considering the complementarity of the two, how to fuse low-light images and infrared images to obtain better observation effects without increasing the difficulty of the existing technology has become the current trend. One of the hot researches in the development of night vision technology.

 

Low-light images have poor contrast, limited gray levels, poor instantaneous dynamic range, and flicker at high gain. They are only sensitive to the reflection of the target scene, and have nothing to do with the thermal contrast of the target scene. The contrast of infrared images is poor and the dynamic range is large, but they are only sensitive to the radiation of the target scene, and are not sensitive to the brightness changes of the scene. Both have shortcomings. With the development of low-light and infrared imaging technology, it has become an effective technical means to synthesize and excavate the characteristic information of low-light and infrared images, so as to fuse them into a more comprehensive image. Night vision image fusion can enhance scene understanding, highlight targets, and facilitate faster and more accurate target detection in hidden and pseudo-confused military backgrounds. Displaying the fused image in a natural form suitable for human eye observation can significantly improve the human eye's recognition performance and reduce operator fatigue.