Research On Fast Fourier Transforms Algorithm Of Huge Remote Sensing Image With GPU

As the development of the obtaining ability of remote sensing image that has the features ofhyperspectrum、high spatial resolution、high time resolution, utilizing FFT technology to handle hugeremote sensing image rapidly and effectively is the critical part and research hot spot of high spatialresolution today.FFT is one of the image processing algorithms, it can be applied to elimination of stripe noise of theremote sensing image a variety. CUFFT function library which provided by NVDIA company is FFTalgorithm library based on GPU. Developed by MIT science lab computer group on PC platform, FFTW isthe CPU based quickest FFT algorithm function library that is run on CPU. The problem faced by these twokinds of realization is that the problem of memory and video memory overflow will appear when memoryand video memory available is smaller than the size of the image. Aimed at this problem, this paper putforward a algorithm of remote sensing image FFT based on GPU acceleration HRFFT algorithm by theimprovement of the FFT algorithm in the CUFFT function library of CUDA, this algorithm solved thememory and video memory overflow problem faced by huge image. Combined with the CCD image ofHJ-1A satellite, this paper proved the feasibility of this method by comparing it with other algorithmsthrough experiments.In practical application, HRFFT algorithm put forward by this paper acquired such effects: improvethe effect of stripe noise elimination, the quality of noise elimination of the remote sensing image, thecomputing speed of the stripe noise elimination and shortened time of computation.The main research contents and results are as below:1) Analysis of the development and present situation of the GPU based image processing FFTalgorithm home and abroad, introduction of the feature of the GPU programming and the features of theFFT algorithm, CUFFT function library and FFTW algorithm library.2) This paper put forward improved HRFFT algorithm and prove the feasibility of this algorithm bythe comparison of experiment on the basis of CUFFT algorithm library.3) Applying HRFFT algorithm to stripe noise elimination of remote sensing image, this paper solvedthe difficult problem of large calculation volume, and long calculation time when applying traditional FT to the elimination of stripe noise of remote sensing image.