Automatic registration of high-resolution multispectral imageries released by low-altitude unmanned airship
无人艇载高清多光谱影像配准

High-solution multispectral imagery is attractive to various users and can be collected with a group of Charge-Coupled Device(CCD) cameras on board low-altitude Unmanned Airship(UA).Due to imperfect system integration and inherent nature of UA,however,the registration of High-solution multispectral imageries from UA are subjected to several challenges.In this paper,a low-cost multispectral imaging system composing of four CCD cameras is described as well as its potential issues to registration operation are summarized.After that,Fast Fourier Transformation(FFT) induced multispectral imagery Cross-Correlation Matching technique is developed to automatically generate high-precision tie pints for overlapped UA imageries.Next,Homograph joint estimation based on the Least Square adjustment is described in detail to align multispectral imagery acquired at each exposal and "leveled" Thin Plate Spline(TPS) transformation is established to register multispectral imagery sequences as well.Finally,experiments of registering high-solution multispectral imageries collected from low-altitude unmanned airship are implemented with proposed approaches and valuable conclusions are conducted.