Abstract:

We made the research on multi-dimensional dynamic hybrid imaging method in this study.In the process of visible light true color imaging of FY-4A data, the channel mixing method is applied to generate a "green light channel", which retains the data gradient information, avoids color jumps, and achieves smoothness and seamless splicing in the horizontal direction and dynamic superimposition of multi-layer images in the vertical direction.This method can assign dynamic transparency factors to each pixel and generate multi-channel color composite images with better quality.The analysis results of color image products generated by the multi-dimensional dynamic hybrid imaging technology show that the visible light region restores the true color of the surface during the day.The high clouds at night are white, and the low clouds are light blue, which can better distinguish the characteristics of the night clouds.The color transition at dawn and dusk is natural, and the image product quality is high.This technology has been widely used in the FY-4A weather imaging product production system.The system has been promoted in 43 cities and counties in China, which has promoted the in-depth application of FY-4A data in the fields of meteorology, ecological environment, and disaster reduction.

Key words: True color imaging, Dawn and dusk, Multi-dimensional dynamic, Hybrid imaging