Seiko Epson Corporation

Fluxdata, Inc.

E.i. Dupont De Nemours and Company

Lawrence A Taplin

Roy Stephen Berns

Yoshifumi Arai

Takashi Ito

Kimito Katsuyama

Pano A Spiliotis

Christopher T Cotton

Michinao Osawa

Tony Z Liang

An apparatus for spatially characterizing an illumination source of interest in a scene comprised of at least one optical element configured to form an image on a focal plane; a single plane sensing array comprising at least two types of pixels having different spectral sensitivity bands, the pixels located at spatially non-overlapping regions of the sensing array; a multi-bandpass filter spectrally narrowing light received from the scene within at least two of the different spectral sensitivity bands corresponding to features that distinguish the illumination source of interest from other sources in the scene; and a processor in signal communication with the sensing array and containing an algorithm to interpolate at least two levels of signals received from at least one spatial location on the sensing array and to determine the presence of the specific illumination source of interest from the relative intensities of the two levels.

Apparatus and method for multispectral based detection

An optical device that creates separate images for different wavelength bands of light. The device comprises a light sensor, a first dichroic filter, and a first mirror. The light sensor comprises a first light sensing portion and a second light sensing portion. The first dichroic filter reflects a first portion of incident light of a first wavelength band from a source through an imaging lens with the imaging lens projecting a first image of the source onto the first light sensing portion of the light sensor; and the first dichroic filter transmits a second portion of incident light of a second wavelength band from the scene different from the first wavelength range. The first mirror is positioned to reflect the transmitted second portion of incident light through the imaging lens, the imaging lens projecting a second image of the source onto the second light sensing portion of the light sensor.

Method and apparatus for separate spectral imaging and sensing

In one example, there is designed a system for calculating an evaluation index for sample ink amount data from a color difference evaluation index and an image quality evaluation index, and creating a profile based on a highly rated sample. In this system, the printer driver is designed to use different indexes to create plural profiles, and to perform color conversion using these plural profiles. These plural profiles may be selected appropriately according to user needs, printing conditions, type of image targeted for printing, and the like.

Production of color conversion profile for printing

A spectral printing model converter is used to convert ink amount data to spectral reflectance of a color patch to be printed according to the ink amount data. A plurality of sample ink amount data each representing a set of ink amounts of plural inks is provided, and each sample ink amount data is converted into spectral reflectance of a virtual sample patch to be printed with the ink amounts represented by the sample ink amount data using the spectral printing model converter. An evaluation index is calculated for each sample ink amount data, where the evaluation index includes a color difference index and an image quality index of the virtual sample patch to be printed according to the sample ink amount data. The color difference index represents a color difference between a sample color which is calculated from the spectral reflectance and a comparative color which is selected as a basis for comparison. Plural sample ink amount data is then selected based on the evaluation index, and a profile defining correspondence between colorimetric value data and ink amount data is produced based on the selected plural sample ink amount data.

A method and apparatus for producing a color conversion profile for use in a color inkjet printer, a color laser printer, or the like. In one embodiment, a spectral printing model converter is used to sample ink amount data to spectral reflectance Rsmp(&#x3bb;). Using this spectral reflectance Rsmp(&#x3bb;), colorimetric values CV, CVunder two different viewing conditions are calculated, and an evaluation index EI that includes an index of color difference between the colorimetric values CV, CVis calculated. I another embodiment, an evaluation index EI that includes an index of color difference between sample color represented by sample ink amount data and reference color obtained from a reference color patch is calculated. Sample ink amount data having the best evaluation index EI is then selected as a representative sample. Profiles are created from the plurality of selected representative samples.

Production of a color conversion profile utilizing comparison of spectral reflectance data and comparative colors

The present invention provides a method to fully utilize the spectral gamut of a six-color printer to minimize metameric matches while maintaining high colorimetric accuracy in the reproduction by such six-color printer of a target image from a target color device.

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Rochester, NY, United States of America

Lawrence A Taplin