Quantization error

PCM consists of three steps to digitize an analog signal: 1.Sampling 2.Quantization 3.Binary encoding Before we sample, we have to filter the signal to limit the maximum frequency of the signal as it affects the sampling rate. Filtering should ensure that we do not distort the signal, ie remove high frequency components that affect the signal shape.

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Lecture Digital image processing: Image compression presents the following content: Image compression – Decompression steps, error metrics, classifying image data, bit allocation, quantization, entropy coding, JPEG compression.

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Quantizing error:–Granular or linear errorshappen for inputs within the dynamic range of quantizer –Saturation errorshappen for inputs outside the dynamic range of quantize •Saturation errors are larger than linear errors •Saturation errors can be avoided by proper tuning of AGC •Quantization noise variance:

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