Transform Coding Examples Fourier Error DCT coefficients RMS Error =1.28 Hadamard Original image 512x512 pixels Subimage size: 8x8 pixels=64 pixels RMS Error =0.86 Quatization by truncating DCT 50%of coefficients (only 32 max cofficients are kept.) RMS Error=0.68
Transform Coding Examples Original image 512x512 pixels Fourier Hadamard DCT Error Subimage size: 8x8 pixels = 64 pixels Quatization by truncating 50% of coefficients (only 32 max cofficients are kept.) RMS Error = 1.28 RMS Error = 0.86 RMS Error = 0.68
Subimage Size and Transform Coding Performance This experiment: 6.5 Quatization is made by 6 truncating 75%of 5.5 FFT 0.1.Ia a.nenbs-ueaw-1ood 5 transform coefficients 4.5 、WHT 4 3.5 DCT 2 2 1632641282552 Subimage size DCT is the best Size 8x8 is enough
Subimage Size and Transform Coding Performance This experiment: Quatization is made by truncating 75% of transform coefficients DCT is the best Size 8x8 is enough