改进DPM的傅里叶变换算法

代码说明：

 INTRODUCTION The train executable can be used to train a deformable part-based model on a Pascal VOC dataset. The test executable can be used to run a deformable part-based model either on an image or on a Pascal VOC dataset. The first time you run it it will be slow as the FFTW library will search for the best plans using runtime measurements. The resulting plans will then be saved to a file named wisdom.fftw and reused in the future.