Fourier transform, discrete cosine transform and Hadamard transform are applied to Lena image. In the frequency domain, the spectrum of their transformed coefficient matrix is compared. Furthermore, the quality of image reconstruction under different transformations is observed by inverse transformation.

Filename	Size	Update
experiment1.m	2632	2018-05-12
lena.tif	264590	2017-10-09
PSNR_cal.m	331	2018-05-12

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