Method of improving a colour filter

    公开(公告)号:AU2007205790B8

    公开(公告)日:2013-02-07

    申请号:AU2007205790

    申请日:2007-08-14

    Abstract: METHOD OF IMPROVING A COLOUR FILTER A method of improving an initial colour filter comprises a numerical generation of sinusoidal spectra. Two steps of selecting said spectra are then executed. The first selection is carried out according to a criterion of colorimetric similitude with respect to the initial filter. The second selection is carried out according to the capacity of dummy filters corresponding to each spectrum to restore hues in a natural manner. To do this, observations of samples of hues through each dummy filter are simulated numerically, using a colour appearance model to take account of a visual perception of a human observer. In this way, an improved filter is determined, which has a colour close to that of the initial filter and which affords a natural rendition of hues. Figure 6a TRANSMISSION MEASUREMENT GENERATE SPECTRA OF THE INITIAL FILTER BASED ON SINUSOIDS CALCULATION OF L*,a*,b* FOR EACH SPECTRUM OF THE INITIAL FILTER GENERATED: CALCULATE L*,a*,b* SELECT THE SPECTRA TO THE VALUES L*,a*,b* EVALUATION OF THE RESTITUTION OF HUES BY THE DUMMY FILTER OF 5 EACH SELECTED SPECTRUM SELECTION OF THE SPECTRUM CORRESPONDING TO THE 6 IMPROVED FILTER PRODUCTION OF THE IMPROVED FILTER

    16.
    发明专利
    未知

    公开(公告)号:FR2752462A1

    公开(公告)日:1998-02-20

    申请号:FR9610229

    申请日:1996-08-14

    Applicant: ESSILOR INT

    Abstract: The method consists in introducing into a reactor containing the ophthalmic article and the additive a fluid in supercritical state and maintaining this fluid in the reactor for the time required for incorporating the additive into the ophthalmic article, eliminating the fluid in supercritical state and recuperating the ophthalmic article in which the additive has been incorporated. The invention is applicable to the incorporation of photochromic substances.

    Transparent optical article having a colorless appearance

    公开(公告)号:AU2014372616B2

    公开(公告)日:2019-10-31

    申请号:AU2014372616

    申请日:2014-12-22

    Applicant: ESSILOR INT

    Inventor: BAILLET GILLES

    Abstract: The present invention relates to a transparent optical article comprising at least one dye at least partially inhibiting light having a wavelength ranging from 400 to 460 nm and at least one selective optical brightener that emits light by fluorescence at a wavelength ranging from 400 to 460 nm. The optical brightener acts as a means for at least partially balancing the color imparted to the transparent optical article by the dye, thus allowing for perception of said optical article as less yellow, and even colorless to an user or an observer.

    Method of improving a colour filter

    公开(公告)号:AU2007205790B2

    公开(公告)日:2012-10-18

    申请号:AU2007205790

    申请日:2007-08-14

    Abstract: METHOD OF IMPROVING A COLOUR FILTER A method of improving an initial colour filter comprises a numerical generation of sinusoidal spectra. Two steps of selecting said spectra are then executed. The first selection is carried out according to a criterion of colorimetric similitude with respect to the initial filter. The second selection is carried out according to the capacity of dummy filters corresponding to each spectrum to restore hues in a natural manner. To do this, observations of samples of hues through each dummy filter are simulated numerically, using a colour appearance model to take account of a visual perception of a human observer. In this way, an improved filter is determined, which has a colour close to that of the initial filter and which affords a natural rendition of hues. Figure 6a TRANSMISSION MEASUREMENT GENERATE SPECTRA OF THE INITIAL FILTER BASED ON SINUSOIDS CALCULATION OF L*,a*,b* FOR EACH SPECTRUM OF THE INITIAL FILTER GENERATED: CALCULATE L*,a*,b* SELECT THE SPECTRA TO THE VALUES L*,a*,b* EVALUATION OF THE RESTITUTION OF HUES BY THE DUMMY FILTER OF 5 EACH SELECTED SPECTRUM SELECTION OF THE SPECTRUM CORRESPONDING TO THE 6 IMPROVED FILTER PRODUCTION OF THE IMPROVED FILTER

    Quantitative evaluation of a colour filter

    公开(公告)号:AU2007207863B2

    公开(公告)日:2012-10-04

    申请号:AU2007207863

    申请日:2007-08-16

    Abstract: QUANTITATIVE EVALUATION OF A COLOUR FILTER A quantitative evaluation of a colour filter (10) in accordance with the capacity of said filter to restore hues comprises the use of a numerical colour appearance model. Values of a perceptive attribute are calculated for hue samples (20), by simulating the observation of each of the samples through the filter (10) and without a filter. The values of the perceptive attribute correspond to the visual perception of the samples by an observer (40), and a deviation between the values with and without filter constitutes the result of the evaluation of the filter. Such a method makes it possible to quantitatively rank several colour filters, and the ranking obtained corresponds to that which would be established by real observers evaluating the filters. Figure 2a FIG.2a. FIG.2b. 1- F IG.3. REAL OBSERVERS 0,8- CIECAM02 MODEL 0,6 0,4 4,2 -0,2 - 0,4 - 0,8 o l b It 2b 2a 3b 5 4b NCS SAMPLES ,25- 0,2 ----4 0,15 0,05 1 2 3 4 5 6 FILTERS

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