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The DCT is lossless. It's the subsequent quantization step that chops certain frequency components.
by bob1029 4y ago
The DCT is lossless. It's the subsequent quantization step that chops certain frequency components.
- orlp 4y agoFurthermore it is a common (even logical) misbelief that chopping out the higher frequencies after a Fourier transform is filtering them out. Unfortunately this merely zeroes the exact frequencies used to define the bins but leaves a lot of high frequency signals. You need a proper low-pass filter.