Images passed to your application are not always of the same size as your templates. To compare them you might need to up scale or down scale them to the template size. It is preferred that when comparing you check the size of the template to b

vivado project file for down scaling of image by scale factor 2

Combined with PCA scale invariant feature transform (SIFT) algorithm, Dual-line interpolation FFT harmonic analysis kaiser windows, Multirate signal processing.