Typhoon is a low-pressure system developed from the disturbance of tropical ocean surface cyclone, and it is the strongest tropical cyclone. It is one of the disastrous weather that seriously affects human production and life, and China is one of the countries with the most serious typhoon disasters in the world. In order to avoid the disasters caused by typhoons, it is of great significance to forecast typhoons as early as possible. Moreover, the earlier the forecast, the smaller the loss. Therefore, using digital image processing method, the typhoon cloud system is separated from various cloud systems in the process of typhoon formation, and its characteristics are extracted and located. However, according to the current data, the traditional artificial forecast method is still the main method to forecast typhoons, while the automatic forecast of typhoons is still in the research and exploration stage. Because the location of typhoon center depends on the segmentation and feature extraction of typhoon cloud system. Therefore, it is of great research value and practical significance to segment and extract the features of Taiwan Province cloud system. ? It mainly involves the following aspects: 1. Preprocessing the original cloud image. Firstly, the color image is converted into a gray image, and then a suitable threshold is selected to filter out some cloud systems in the cloud image that do not belong to the typhoon cloud system. Then, a method combining recursive median filtering and mathematical morphology is proposed to filter the cloud image to eliminate noise interference. Pretreatment greatly simplifies the follow-up work. ? 2. Cloud image segmentation. According to the characteristics of relatively high gray value, large area and small eccentricity of typhoon cloud system, the cloud image is segmented by gray threshold method, area segmentation method and eccentricity segmentation method respectively, and the typhoon cloud system is separated from various cloud systems. ? 3. Extraction of spiral cloud belt. Firstly, the characteristic information of typhoon cloud system is recovered, then the spiral cloud band of typhoon cloud system is extracted by difference method, and the extracted spiral cloud band is skeleton and pruned by mathematical morphology method, so that the local spiral of spiral cloud band is obtained. ? 4. According to the extracted local spiral characteristics, the typhoon center is automatically located by least square method.