CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '91350edca8daf918',cH: 'tHQVLQbMLzj4ntvlw7vV9zi.tM5bSAJLCJUjdPgohEQ-1739787765-1.2.1.1-PgiPHSDgVyn0JLBnoMx_WgCjuMaSkwTWbTAD8dM_DT0rYlkhW0kLDRaU7s4zHcg5',cUPMDTk: "\/abstracts\/2968\/a-way-of-converting-color-images-to-gray-scale-ones-for-the-color-blind-applying-to-the-part-of-the-tokyo-subway-map?__cf_chl_tk=PF0As0Uv28b.Zwndu83f22d_axHn2h_7m6CF1LsQxFs-1739787765-1.0.1.1-bPOvIrFVhAxyn2NhVLk31IT8ngzwTGsA.IV.HqWI710",cFPWv: 'b',cITimeS: '1739787765',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/2968\/a-way-of-converting-color-images-to-gray-scale-ones-for-the-color-blind-applying-to-the-part-of-the-tokyo-subway-map?__cf_chl_f_tk=PF0As0Uv28b.Zwndu83f22d_axHn2h_7m6CF1LsQxFs-1739787765-1.0.1.1-bPOvIrFVhAxyn2NhVLk31IT8ngzwTGsA.IV.HqWI710",md: "IFqVn4Gkpj62NOimAswtTS8MXJssXefPljP4Clm5Reg-1739787765-1.2.1.1-SFGYieKQfPafx.G1miDxOP2B18lLxmJewngc4dmJEefEBhMMEpJc_xrmumB7D0nm0SAA2yHIlpboiB.8ol0cB_Gf6OVeVy0Oo7HEJWxQdZTjxxo2bf02koLXIObyw4ZekMqeOIuiBOb69CUULxm0EEoepSVN8M97HY8TnGsOfsvxQUuhZgZxrh28M5RimG2O8X5_m.74QF9xgvukpWOp_r3SJgN3.Qi0Ln2B9SbyC3i7UBer5xaAwrzIP_gzespIsdZI1osGCvNeoDvz.V0SCYaZKUegEwQsegD7FJ1.4TOePN9aG8f6C3q3CPhvZJVqM_5k7OjiEZEyqNvADwbOJORJDL9Bz6R0ACwBCGnPf68YD4Wz7aplkGICNME0.Fn69dJaK5Znmt4bmKXnkjMXca0DqtoechqF.oOFQLG7VwEaW7NOQ4JT87Rp_5v1im3Fuz.ZjVxnKmVIw_f9WL.IBA5mDv8Hs6zHSrgNxUDrzltYIEzT27VX.f0YwApEVlvg_LL26UVZp9R3GTN_Pfy7qmVC3Y_AWsuqY7XsurYUC6lP.MfJH0R_JsQbmIlTjyk.cOUS5yx1qivIPze7NbXvdHPBUhtIkeKzs61BJcOuCDENMJ0hLvPsSNMcJ.wHnAXrB_pBRU8lsLxrgRkWGB6vY7haZwWDzViehh1r0IRdJt3Rl96lhUlg8rnCgN01nFkUmv54iY41pIvHU9PxmPhJH.L4jx_ZkkoI6k4FYZpqmq7St5p0skDDXrRQ4Spo9Iehba5wOTB4HKsKiImerYZfy0TgoyBCqt5BlOfnfhPHIWaFrxez7SDgmk6VQUntEA4HLqkhMtl2cliVRkPXPzafjq9EuCtY7UEyjIp0pV7gjWuMcIfMa7K4tDbGr4QoSsEFQ_HiBI1j9wGoiaZh82CJ1FM3vLU7TCWEjXrFPI9hH70TywVCn7OpMUHGFcL51NSg1qeVoRUDU_E8fUi4gATnshRuQ2sQMRFpQE8V.KErB9d5aXLViZkd0N8X_H96VDS8zKQ3v_amK1JSC_3iw8Q4ie8W2c06uYHJVD2PJ9evH6RCvWYwe4MPWub3y_W1o3GbWtqjbXEBbfVTCzjNBA.7wNE_on5PvGR0LqCRSxUi43IOHbQhgbZ3IecpSpU5eX0mG2.R_lXMDALdjDO.MPZbRZaP4B9hPoZLRhAJSw7RXcEA75En..zTSKIirC8_6NP9aQ3pl6TvBrDeu3tCo5q4OvFRve.Bkuf7UMOsLBpdUtilA9gzEekSNhkll2J9g7QBs2AFkIpHV6UM8O.cpsuNpAPRynWiagpXvAnnj2MJ5v4KP0cHzHeHnXOdADtvXcH9pld2gW2s5ilPWFGCBJi9puvD8wkUnOvEu0x2opAtqTlxe4iLR0b7CLrQfpf6j9cUApxWB.RPZyn1E8FaOoeyzknst50.LN4_xliC4HXJKYw0L79Y82cpEzhLZnjxJNBe32fvcgU3nxMPLXdhrYuE4UENdquI76XNGfaE7ARa_7g80_gwuDpGdjy0gcrsBj_ph0m2Vkbnrr2JKGlGTT3thyM6I4Y.kgUo0Gkuh2RtRVtalEg62eCLq2O5vU1m.1HiBdvVGqybT0U3ZcQh4H8B20gDHf_Yk2OzfjfvkRXMTrlBsPHHAhQcTG7dQI0FDU2GTBb3CKoquim6wRgx2ISLsWApmHbUAPngUOE0Cghz2XouI9ltB41B1Jrt2mYjDcbOYcRDv3WE0Ubds6d5iIIiTp7Ei.WJZwLmaBoh8h5J3w0Yv4kvwFmDxMPsv4T.bEs9zHVMY9.wFN9w2I2m8mbNS9TEAP6dE3PV7j0nUufN3bdIAJx4pwzl.foQYkjQye.45A.02feqkSchZzMUYVb4oWAQgXOHWLjQdnuU4VmwQYfN59kICnfZpATs.uERivjDbnuzEC56Mz2_05SQ3UE8jO1BWFG494EMtCjmbaoz2zfONNBgT_b6QqUGCZQh.qTn7fLWJhKNfB95FOdW9ewEcGQ6c43i_LV6VcKnN54brwd2geX7eZkkT2tyIQ527gluUKIO9A5Azi3tFHrfDlx8LojaV0zmVu.SR7ILi_jqGgfEQ7GDWhGaUKa0c48fGOSpkI50xQqZiWylPB2V88KzI6UCdth4wKBFph37241IJTBlahZb5wCkUsQs9XJN6IidnbxXbtBMnkSKfNQ3hTnjeNy9zsfNaB8L_PSVFj54fhU",mdrd: "lgAeqX7nm4n6AHv.XU0ECeSFd5o4BuFv91P38mLY2s0-1739787765-1.2.1.1-FeGtywOjEdaHVh9NYgZ3LvU_vZhMrShwWxPGHMWAHTFNDCMg_mWvUW0b2rFI_ITV0qjdnfM6n5K7HtxL0zbant_MBgaJbCxKCRdvMwbnRtB2Y4TxNU17rA8hOfZUQ2AfumrOjmrwjN5k4GUz47b1ymlfvh8t6cl9xVM04d5krO_X7Coqc0z5SIiDyOE5iVpvkKlCbDx6tCFh09jt8Lh2Wt6Alw5i10TL_gYEBjzan78.xDnuC3.g1TeDHdlyTnAVrqfBO.LXhW5GHVvhceCWmjyI74svlEPoVpN8Vl08cHhBlxZpogZSjKxc_4oG7NQVdSh75OwiKmzaHoPUfbeWCaClLav6m6kdOe74pBIa1HHn3kZEUl2kCCM1eboVxb0hlrAEUTTXzrTVbQCjt9nqdVbTs6y.soAapHsII_rT.8vPIX04cFmNS4J0r6_Nf4KHPUhP_EVn5FxQhygX2hwlPyaWyKPbwJBYJc47fz08MH.WhE_bOFN4OovGgy_CadDqfinHZir9DlLWNA3bjkVcuHlVfod1C3rAR4cl07eQa_yl3QpEOQzUwoWJ9scTeVkvbvYD94YyFSWAcFOc00Tio.xQGMYfRL8Zj6lX2On8ttn90sX.oHgqYAE_StWs0m7lw9LNVx9cVHivCqvvKAceHm1ndl.n0Y198maHEKIbHzlYFnm1R70L.uXrTc21d5WTPtYt8oO2e0Dk6h_YB9_Rohsa4moDjEnkKotdrpRlp1uILP1OkCf2poyoXnLaOgYMcZ7mgjGp5nTwdNL1Nx9j3m9m5yrkMymEyy53Nf.0V5XOqOOacq20ZjIN5rZFP3IvdSktP1wuQHTE.Iz1KRO8sWJOCzTItRbf7IOlj7SW5OITCVEFqO.dgwVqMh9WpuDrHzRHt5KsGOsTm85kvQpmPRRzIwWSxZ1SfT6vGHCWt5Y2_KOaCaC5zxBAavBNnBCvbpQ9zBWbmw6GGtmCjB5nw_NoORTTl7PSKknbcfO6wT59T_UwpdC4hVrWPFdWOaO9wCHfpOv.pabZAeWijHkmget.s80xD7KTd7H6fCGjbiJiPFi0T.viUk4pmcP_RDUYO9JPyZMvKaW2jYQaZ_VmgXOshClujJnGiJIgjJwzYiLi7ngglI7tQeCUSlXXVUnRSXMKca2EAV3q9JYwa3OuFtIrSoigpHQkgnW6Nyx.73Gm.RHk2fRID36gfpnT5i9uVRHbIwpgV6KdjvYl_Cxw3fE_XiX8hJ91d4kRx9IHEWHrospE0BiveyIcshlkmYXdUkGyShLWsiw4mCbLIwEuiUaEtf4Pf3SnLQ07BPWoLXCD9ZjL2keh4FnLj1.V.lKF4IBraygdLDnIgtSI8oCuHB1xiKPgirOjRk3hbf8d_fnN1t5dorOH6DWK9WVw4OL5aFt_UiYNA6HVB7vUUxLoQQDImaDnvjd9H1v3V3O4MVmuzwSeAeqoEcZOZ4rypV.tT7b_loztqkuqc7TNK477xsCul3xmVusf8U7kJO_OcXWE42Rf_u7snlDqv1fqt7szGIgA85CAEpacDIUaZVRNKEFfv8.NuMH5olE0zWZIMPusxw8apqzLB94zV_ASL7_4Y5dIHtciIN8pgokq4tkMgdM4n1Peql1LYej_3xp.Z8h6JTwvYLqK..m3yhWojS8mPrCReNRhPAhVIlHPPNHJKEFaHA_3EVd12_eUMgoYk6AWt4YSOr7qpIxWQUoy0s68bf_wue.irRwhQs6KMVcASnY5egwCCYflogOxhLdP4f9jYV8qptWTbTGdkEl7N86lXVh_hJG5U858llaEWcS2tZAHCr1dZVM9cuGCRvFZe4b77Ufu.9jdJdPhvUolWd6hN0X5.LOk9qdgScQvsrt42Ub8be_RZV1IQCY7ulRkLq47J6UpWO7w7oSdfbuGUQnxSOqz_JpQpGFXv2n2yeCwompA3dtW4GtSBTAwRD3EMhPFULdWpAtqCKvOCk479Lbm"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91350edca8daf918';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/abstracts\/2968\/a-way-of-converting-color-images-to-gray-scale-ones-for-the-color-blind-applying-to-the-part-of-the-tokyo-subway-map?__cf_chl_rt_tk=PF0As0Uv28b.Zwndu83f22d_axHn2h_7m6CF1LsQxFs-1739787765-1.0.1.1-bPOvIrFVhAxyn2NhVLk31IT8ngzwTGsA.IV.HqWI710" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>