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Full width array scanning spectrophotometer

A spectrophotometer, full-width technology used in the field of high-speed online document color analysis to solve problems such as harmfulness and errors in scanner color correction systems

Inactive Publication Date: 2009-10-28
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There are at least two problems with the current scanner characterization solutions described: (1) the user must select a specific print medium and specific ink (here broadly including liquid or solid ink or toner) The correct profile for processing, (2) Even if the correct profile is selected, even within a given print media class there may be sufficient variance in the input material to cause detrimental errors in the scanner color correction system
Objects must be interpreted by an expensive spectrophotometer

Method used

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Examples

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Embodiment Construction

[0025] Embodiments will now be described in more detail with reference to the accompanying drawings, which illustrate the main concepts of the full-width array scanning spectrophotometer system 10 . As will be described further below, the document 12 to be scanned is illuminated with the illumination strip 12A by the double-sided LED illuminators 14 , 16 . The central region of illuminated strip 12A may be vertically imaged onto a 3 or 4 row full width array (FWA) image sensor 20 using SELFOC lens 18 . The entire spectrophotometer imaging module 10, consisting of the illuminators 14, 16, the lens 18 and the FWA image sensor 20, may be stationary, with the document moving over it at a constant speed, as in the normal paper output path of a conventional color printer as in figure 1 shown in (other examples can be seen in the references cited above), or otherwise. Alternatively, the document is stationary and the image module moves at a constant speed, as in many imprint docume...

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Abstract

A full-width array spectrophotometer for full-width scan color analysis of a color detection object having a plurality of different colors transversely covering the path of the printing paper and being illuminated successively in a multiple repeating pattern of at least three or four different colors. One or two generally linear elongated illumination arrays of closely spaced plurality of LED illumination sources are emitted to sequentially illuminate transverse illumination strips on the printing paper moving along the paper path; also including corresponding elongated low cost An optical imaging strip comprising an elongated array of parallel and correspondingly multiple, closely spaced, differently color sensitive (three or four rows of color filtering) photodetectors, the imaging strip being configured to detect and analyze images from Light reflected from strips illuminated in transverse succession.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] Cross-reference co-pending, co-assigned application: US Application No. "Systems and Methods for Determining Spectra Using Dynamic Least Squares Algorithms with Measurements from LED Color Sensor", filed August 30, 2001 by Lingappa K. Mestha et al. .09 / 941,858 (U.S. Publication No. 20030055611 (Attorney Record No. D / A 1027), published March 20, 2003); and L.K. Mestha et al., also filed January 16, 2004, entitled " ReferenceDatabase and Method for Obtaining Spectra Using Measurements Froman LED Color Sensor and Method of Generating a ReferenceDatabase" US Application No. 10 / 758,096 (Attorney's Record No. D / A 2361). technical field [0003] Disclosed herein in the embodiments is a full-width array color spectrophotometer scanning system that is particularly suitable for high-speed online document color analysis (including grayscale analysis), having at least one full-width array polychromatic illumination system and using l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/50G01J3/46G01J3/10
CPCG01J3/50G01N21/255G01J3/501G01N2201/0627
Inventor L·K·梅斯塔J·C·坦顿S·B·波尔特
Owner XEROX CORP
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