Reducing quantization errors in imaging systems

Details Reducing quantization errors in imaging systems Reducing quantization errors in imaging systems

2005-02-08

2005-02-08

Rogers, Scott A. (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003130, C358S003260, C358S518000, C358S523000, C358S534000

Reexamination Certificate

active

06853468

ABSTRACT:
A technique is described to greatly reduce or avoid the quantization errors that occur when mapping a relatively linear RGB color space into a greatly non-linear printer CMY color space of equal precision, avoiding the contouring or banding that occurs when printing color gradients in a non-linear printing system. The technique performs a dither-like process on the original RGB continuous tone data. The RGB values are dithered to create a range of values that, when mapped to the non-linear printer continuous tone CMY values, creates a range of CMY values that, on average, represent the correct average tone of the input RGB values. The generated CMY continuous tone values are then halftoned and printed.

REFERENCES:
patent: 6115031 (2000-09-01), Love et al.
patent: 6215561 (2001-04-01), Kakutani

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