图像有损压缩-FFT-DCT变换后再次还原的-Image lossy compression-FFT-DCT transform again to restore the

demonstration of fft in 2 D on image

The discrete cosine transform (DC T) represents an image as a sum of sinusoids of varying magnitudes and frequencies. The dct2 function computes the two-dimensional discrete cosine transform (DC T) of an image. The DC T has the property that, f