Research On Extraction Technology Of Sea Surface Information Based On Infrared Imaging

The ocean occupies a pivotal position in the earth's ecosystem.Maritime navigation,marine commercial fisheries,maritime military,environmental monitoring,weather forecasting and many other fields make it necessary to study sea surface information.Therefore,it is of great significance to understand the laws of ocean changes..This article aims to use the infrared imaging system to obtain as much and accurate sea surface information as possible,including the temperature information in the sea surface information obtained by the infrared thermal radiometer and the texture information in the sea surface information obtained by the infrared thermal imager.Therefore,the infrared thermal imaging system is used to obtain the sea surface temperature and compensate for the error,and at the same time obtain the sea surface texture characteristics and the wave direction.Based on the principle of infrared temperature measurement and the principle of sea surface infrared temperature measurement,this paper analyzes and compensates the temperature measurement errors caused by the sea surface emissivity,window lens,and sensor cabin temperature.Use Masuda model to correct the sea surface emissivity,analyze the influence of ship rolling on the observation angle,and conduct experiments to verify theoretical analysis in the laboratory;establish a window lens radiation transmission model,analyze the size of the window error,and derive the formula through linear regression,The least squares fitting method can compensate the window error;the constant temperature control system is designed to stabilize the temperature of the sensor cabin in the suitable sensor working range.Field experiments are carried out at sea to compensate the errors.The results show that the average error after compensation is small and the compensation effect is better.In addition,due to the different emissivity of the peaks and troughs,the infrared thermal imaging system receives different radiation,so a light and dark texture is formed.The Fourier transform spectrum method is used to obtain the amplitude spectrum and phase spectrum of the sea surface image;use the wave direction line It is perpendicular to the crest line,binarizes,crops,rotates the infrared image of the sea surface,and counts the maximum sum of black pixels in a specific direction to determine the wave direction.