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RISS 인기검색어
- 검색키워드
- 저자 : V. Collomb Patton (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Color accuracy of imaging using color filters
Boher, P.,Leroux, T.,Patton, V. Collomb,Bignon, T. The Korean Infomation Display Society 2012 Journal of information display Vol.13 No.1
In this paper, the problem concerning the color accuracy of imaging systems using color filters is examined. It is shown that the only solution to the problem is to build systems with the spectral response matching the CIE curves as closely as possible. If the spectral response does not closely match the CIE curves, it was demonstrated that calibration cannot solve the problem and will result in very unstable colorimeters. A practical solution that uses telecentric lenses on the sensor side in addition to dedicated color filters for each CCD detector is presented. For systems that closely match the CIE curves, an innovative method of improving the color accuracy based on the precise measurement of the spectral response is presented. The small discrepancies in the spectral response with regard to the CIE curves are corrected in different ways during the measurements. Finally, it is shown that the tristimulus calibration that is used for display measurement is very unstable for systems without CIE matching and is much more stable with systems that closely match the CIE curves.
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Color accuracy of imaging using color filters
P. Boher,T. Leroux,V. Collomb Patton,T. Bignon 한국정보디스플레이학회 2012 Journal of information display Vol.13 No.1
In this paper, the problem concerning the color accuracy of imaging systems using color filters is examined. It is shown that the only solution to the problem is to build systems with the spectral response matching the CIE curves as closely as possible. If the spectral response does not closely match the CIE curves, it was demonstrated that calibration cannot solve the problem and will result in very unstable colorimeters. A practical solution that uses telecentric lenses on the sensor side in addition to dedicated color filters for each CCD detector is presented. For systems that closely match the CIE curves, an innovative method of improving the color accuracy based on the precise measurement of the spectral response is presented. The small discrepancies in the spectral response with regard to the CIE curves are corrected in different ways during the measurements. Finally, it is shown that the tristimulus calibration that is used for display measurement is very unstable for systems without CIE matching and is much more stable with systems that closely match the CIE curves.
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Viewing angle measurements on curved displays
P. Boher,T. Leroux,V. Collomb Patton,T. Bignon,P. Blanc 한국정보디스플레이학회 2015 Journal of information display Vol.16 No.4
The simple fact that a curved display is no more flat induces new visual effects that must be studied specifically. Display viewing angle, generally referring to variation of emissive properties (luminance and color) versus viewing direction is generally affected by the curvature and must be measure accurately. In the following article, the angular distortion of a viewing angle measurement made on a curved display when using a standard viewing angle measurement system (goniometer or Fourier optics) is expressed versus spot size D, radius of curvature R and defocus H. The limits of validity of viewing angle measurements on a curved display are deduced. If the ratio D/R of the display is below 1%, the measurement errors in the angles cannot exceed 1° for all the viewing angles for a system at focus, and the accuracy of the measurements remains excellent. Out of focus, there is also no impact of the angular accuracy if the ratio H/R is below 1%. The simulations are compared to real measurements made across flat or bent brightness enhancement film and on a curved organic light-emitting diode cell phone display.
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