Quantization for a digital printer using modulated image data

Details Quantization for a digital printer using modulated image data Quantization for a digital printer using modulated image data

1997-12-18

2000-06-20

Mancuso, Joseph

Image analysis

Histogram processing

With a gray-level transformation

G06K 900

Patent

active

060786876

ABSTRACT:
A method of dynamically quantizing pixel data for use by a digital printer system that prints the pixel data with modulated pixel values. The data is first modulated, with the output pixel values being determined by an image screen. (FIGS. 1 and 2). Then, the data is quantized, using different quantization tables for different pixel values of the same image. The parameters that determine which quantization table is used for a particular pixel value include the pixel's position with respect to the screen or the pixel's image content. (FIGS. 3 and 5) In the case of data that is also being compressed with differential pulse code modulation, the quantization can be based on a buffer fullness measure (FIG. 6).

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