Digital Signal Processing

@article{Oppenheim1975DigitalSP,
  title={Digital Signal Processing},
  author={Alan V. Oppenheim and Ronald W. Schafer},
  journal={IEEE Transactions on Systems, Man, and Cybernetics},
  year={1975},
  volume={8},
  pages={146-146}
}
Quantization refers to the process of approximating the continuous set of values in the image data with a finite (preferably small) set of values. The input to a quantizer is the original data, and the output is always one among a finite number of levels. The quantizer is a function whose set of output values are discrete, and usually finite. Obviously, this is a process of approximation, and a good quantizer is one which represents the original signal with minimum loss or distortion. 

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