This section will introduce the design of multi-light harmonic image fusion system by taking the fusion imaging system of low-light TV, CDD and thermal imager developed by Nanjing University of Science and Technology as an example. The workflow: the video of the low-light TV and the infrared camera will be output to the fusion circuit, and the video is collected by the fusion circuit. The acquired low-light video will be subjected to spatio-temporal filtering and noise reduction processing to remove flicker noise in the low-light image. The noise-reduced low-light video and infrared video will first perform image registration processing. The registered infrared and low-light images will be image fusion based on color transfer and finally sent to D/A. Output after conversion to standard video.
In the traditional image fusion system, the front-end infrared imaging system and the low-light/visible imaging system respectively output analog video signals to the image fusion circuit, and the image fusion circuit needs to be digitized separately to perform various image registration and image fusion. Processing, this will inevitably increase the time delay of the image signal from the detector to the monitor, reducing the image quality of the image. In the fusion imaging system, the denoising processing technology for the low-light image is added, and the pitting noise of the low-light image can be effectively removed, and the uncooled infrared imaging technology introduced in the previous chapter can be non-uniform. The digital infrared image of the corrected and adaptive image enhancement is directly outputted to the image fusion circuit, which avoids the disadvantage of the analog signal being susceptible to interference and reduces the delay time of the signal.