DCT used in JPEG compression. In Python calculate error rate between original & compressed signal
Principle of Discrete Cosine Transform(DCT) which is used in Image, voice compression is compared using Python Scipy. Error rate between Original and reconstructed signal from 20 coefficients of DCT is calculated.
Using python SCIPY package we can see that relative error of using 20 coefficients is only 0.1%, but provides a five-fold compression rate than the original signal, which is why it is used in JPEG compressor and other video, image compression.
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