Apparatus and method for dynamic step quantization

Details Apparatus and method for dynamic step quantization Apparatus and method for dynamic step quantization

1990-12-17

1992-03-31

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

341139, G06K 938

Patent

active

051014521

ABSTRACT:
The apparatus and method of the present invention operates upon the problem of contouring that is encountered in the digital image processing field. The preferred apparatus embodiment of the invention forms quantizing steps that vary in size during the processing of signals in order to minimize contouring effects. The embodiment includes a transforming function block for receiving digital input signals each representing a magnitude value requiring quantization, the transforming function block provides an output gain value that is a function of the magnitude of the value of each received digital input signal. A quantizer is provided for receiving the digital input signals and for performing quantizing steps on the digital input signals to provide a multibit quantized digital signal. A first randomizer is used to randomize the least significant bits of the multibit quantized digital signal when the output gain value is less than or equal to threshold value. Lastly there is provided a second randomizing means for randomizing a number of bits of the multibit quantized digital signal when the output gain value from the transforming function block is greater than the threshold value.

REFERENCES:
patent: 3562420 (1971-02-01), Thompson
patent: 4611342 (1986-09-01), Miller et al.

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