Patent · US Active

Methods and apparatuses for controlling print density

US7729015B2 · kind B2 · utility

9Cited by
11References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 20, 2005
Grant dateJun 1, 2010
Priority date
Expiry dateMar 31, 2029

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04N1/6041
  • WIPO fieldAudio-visual technology
  • WIPO sectorElectrical engineering

Abstract

Multiple input patches are received on an output media, which patches are characterized by print density representing a document processing system's response to different input grayscale values over a potential response space. Values associated with the print density of each input grayscale value are measured. Reference Engine Response Curves are determined from the measured print density values and input gray scale values. A variance data representative of a difference between each measured print density value and a respective reference Engine Response Curve is determined. The variance data is transformed into individual components. Based at least on one selected individual component, a set of calibration compensating Tone Reproduction Curves is determined. The determined calibration compensating Tone Reproduction Curves are applied to input grayscale values.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.