Adaptive quantization apparatus

Details Adaptive quantization apparatus Adaptive quantization apparatus

1992-11-04

1996-10-01

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

358430, G06K 936

Patent

active

055617190

ABSTRACT:
There is a signal representing an original image. A device generates a signal representing a predicted image original image. A subtracter derives a difference between the original-image signal and the predicted-image signal, and outputs the derived difference as a prediction error signal. The prediction error signal is transformed into a transform-resultant signal. The transform-resultant signal is quantized with quantization characteristics. An activity of the original image is derived from the original-image sign. An activity is derived from the prediction error signal. The quantization characteristics are controlled in response to both the original-image activity and the prediction-error activity.

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