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I have built a model of JPEG encoder using Java. I implemented a simple filtering before sampling. I used couple of filtering ways:
1) simple mean value between two samples
2) tent filter (FIR with three taps 0.25, 0,5, 0.25)
3) tent filter with phase shift (FIR with four taps 1/8;3/8;3/8;1/8 )...
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