The invention discloses an image processing system, comprising an FPGA development board based on a Nios II embedded processor, an SDRAM controller, an LCD controller, a digital tube controller and a JTAG controller are arranged in the FPGA development board, and the JTAG controller passes through Connect the USB‑Blaster cable to the PC. The method of obtaining the temperature of the upper atmosphere is to find out the data closest to the theoretical value in the measured value by comparing the measured value with the theoretical value, and the temperature corresponding to the closest data is the atmospheric temperature. Compared with the previous computer processing method, the processing rate is significantly improved, and it can be processed automatically without manual work. The Nios II embedded processor makes the circuit design more diversified, software functions are easier to add and delete, hardware resource configuration is flexible, and portability is better. Strong, and the development cycle of this method is short; the original fit image captured by the CCD can be directly decoded without converting the format, which ensures the complete image information and improves the calculation accuracy.