本程序用于提取图像库的gist特征，matlab编写，有test文件-This procedure is used to extract the gist features of the image library, matlab prepared a test file

详细表述了分数阶傅立叶变换的离散实现，将现有的算法进行比较。-In this note we make a critical comparison of some matlab programs for the digital computation of the fractional Fourier transform that are freely available and we describe our own implementation that lters the bes