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: '9135a4dc79db9ccb',cH: 'wazOiVHdiwfLyNYE4XKr.jaD6w9Isb_jK2PnWFWIp28-1739793909-1.2.1.1-MlzA2br.JfJEMLJ9qq1YCn5T8ciNQg8NijbrZJV67Th3G7GOJdM4y1N.p3plsKFa',cUPMDTk: "\/abstracts\/search?q=spatial%20histograms&__cf_chl_tk=o72SOJYEKVoAVRJi7E.y4digjbxdU8Ft4ahILzY3Los-1739793909-1.0.1.1-iTAaUo9c2ZN32K6W5VX3lhtwrWGpiPU6aEI9hbDr2co",cFPWv: 'b',cITimeS: '1739793909',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=spatial%20histograms&__cf_chl_f_tk=o72SOJYEKVoAVRJi7E.y4digjbxdU8Ft4ahILzY3Los-1739793909-1.0.1.1-iTAaUo9c2ZN32K6W5VX3lhtwrWGpiPU6aEI9hbDr2co",md: "8S4FAdp2OUaAhWrNGOcXDWPUfEePWi1yrmzgyJfLaCw-1739793909-1.2.1.1-qvUkvtHAdffV2XZmon1MnL1gdTFT3.e5N9jF1D3M8x3FfUSAkmGczKOiB3zXHShQYL8NccUesswfrmg6fXPT1CaGSCj6Tnhkoq_FpA_VvDMlGMtDYKEbA0ZIP.dvbIuijO8Lq7M4GBG7gzqCq_zIgoLfr.tllnG7iuFZe70d6pAaW0c_KfWnszJlNJsBQ6bvf9Yu7v6iayXHS096Vc0Ul42CYGdPkrsf7yKepg.g2B90AuQG6ExiKhBLIDetJyjAICy5Hb2OOg_kr8dbYQbWbJtlKugFikyICcKJA2qPzn803A2fsTEpqmGVOInA7IXrOphbgeF0mCPPorecm2_WVsBCKW9uNaKD1qUDYQVFP_4zmCUz1ejfFdVo3RXmYt202YfFMkibhSiRIsISe_sZjogoTo4dQukhs1O0tD8BK3pAA5llbDR59W1I4XyX3GU41L3wqRbaySEHEZFbjxiG4smMO37ZvkFHMDCDD0Cd8_fitgBJuwpzHiPYQZXMM_CwvdIZ_eJ2oYXWOm6WuzBC4G.XMn7kr0eqYV3L1FwbW7YoecWPtE49Zq5wkD3YVIxMAKZuQMjU_I_Vqo8UQvorme5cZaZ3LT.Q5nQ4LL7eU2d7pWKugE5uNWKGCHyHIq6JoZtcjecaD3FwmOW340Yo0wtwKxtqdu8gbyJ2yTVwfYrLj2OSpgHbZcVXfyyS.Cx98mH.A.QJ2_S_g27Pat3FtsXkVTwMUFBOTclapOcLVLYAXB0sdcwuLY3LR1tQWpGKpm6mkJ3bnGdJnOnChglj9PgHvKusIJ7cHHOGIWDebquUuW7R1BfCQpsLLAk0AUlV1b1vt0Ldtm0dfNu.mSYto7R_7A0yRsFr.II68ado3SND.rNE3ZwiVgSdMQ0nthzeDmK57fdC6ApNlKblhbgak0RRgXHM5swUdQ4HYo3qQ07JyaUPapdECVluphEhRbgvaQaQ.TphExEgsG426S3ZGDfQlmRR6I9NPCHDSuPhbltqhnXu61qb1K7SGomISUzh_FL6mMn2ZgoojHVLSUosDuaHk_gOStzAbSAcORDfXKMPjHvh5ynVm25oYnFB._GALamy7Yk.oAcEQ2y1wU2axdgXQti.iTcN.ekY_m_kJZnmp90tNtuS8.iMZ9k2.O7omu1953_0q_6PwTK3_KuZKvl_WhzKw1hvlzGaDsUOF.RR4vHY.6QCslt9_KdEvKtllgzVL1r4X9Pl4h2bMIZqoL0f4j3g2nOjPSO92CZ6smash_sZ8F174mlgKkQftCp66M8tYyJSQ_VJ_2ChP6TJRQpWxz_6N0W85Euw2grtl5xYqJyf40flU7NAt.1lCs_DUkqAm2EHHoaqApPYn9MZaGy2x5XQVTv4Q3H.Jn7trKIP5upMmLWCJcYI_KF0YYc9raGLt1sPJ6KMt8YXP1UU5aLU9pfrdS0_tDz8Y8TmfdJaaR01oZ8dUDquaXI9L44NHMNtOTynqndMYdJCqGAVsU7MSkFF5rMjx1ROLMl4DIPyykk6ptwUuyKUPV0.i24CrKcr2TkHuX5.CDQJG02Wc5wbmuoHV_4CSnGhFBMqg349Z0TiJBWPFJzfKfmUJL1FC.jkVzf2qLzpOdZio213PduoAVKxSY3A.3KCTdCnzxLFjDePxtZ1pXgLvAqBnBSD1I48D7XeLbG9HvKZy_M8rsv4Cu_8iVfK2fvxXpcus4DfiST9HHI5wjkt8BXbU9zLLxVX7uWGzo_Njr0Xdu_4B9P2LYnbs0to7F13HPXsZEfey51gSrSB4gmm59BBNl7bSA0E_17j2MQpAWzSPq7PKMgbSkNwLERwNj7OxtLe9__HUYsMh._7AhX0XPoLNdMWZOGIxYIukazVAMaRQe8kBFJL8bvtv18uMGPVqY_AywuyHt6eTLEKERx7mkhRntI4N3Fv8jiGZHcJ_QRWIh8MyG3nfeKp3H2jRM9EDh3pBwo",mdrd: "6QPDUuSmhq2gd3azb1MjjmjM2LqQJiqS_yXnbrGkH7g-1739793909-1.2.1.1-dnQT9qSC9dJAowOd4y0qVbUkeY9l6kwq7gtKEr.UBKA9krc8pJsOKTDYu14i4ulMJbpt.22JPk2PpG1_MLGmc_kVyezmqW6KL1K6rSJPnPogwXAiWeVffQy8NTCerE4POZCM5pfb7TPNqIPJRQKSO1kkZH5QOB9iPp4CLbw5yb1doYRBiHyfaMW6Y8ne0qbjsoAfmULjmscATCUHVcp5wJhnyuFkDVcRASI8yZ8g3SGCG9EdEQFiTZvmbOOsSOmqXgK..nqK6HL0AwrkUtUvainPPFW7JgaQAqhpV0VaYOfUwCBYj_YkWhJMDQ1aExxtQaKP_tFSQxBhhdgLicXy8FPGnoVru8T0zcKha1uUnhr7aSad17UEfD5CZsYY4KfaAXFBl6WSCa_rZQBy2AP7bseLukEyigI.80XfNQ04.Qcxw9gnlC1.Wb1KSfbLqJj95TlaU7khkP8s7C9gITcSNbjZofHlDJ.iVvuabbDaClZezdujCxh1.k16HEJsxYmMpdWwJDv6dPjZs8tDFY06x5J0Gp5pPbGnCyao7_RANM6qe_1TICfpt3d1t86_MtMZnJfQNNCJG7uljR.59wFLd8b3Ee9fdn7R6nd8X40Xy70FN8fLT8O.xxxArszNVBfxrVFmoA7aGxRLsRISBbL4Mgp2_EpH0KqoiNM9MPGDxi8tFxMXdB26gJyRKCfyqQld8kH.yK5wcy7AwQb2zz1OvDlzJ2mM4ODIEXz0yL40LrNpIISPBrlxKMSRTZFk7rTe62Cunxp0M_K.yCCrEYbHluxkj1zY0V5_Sf67IbNN0rfpXKVcXJsY3SuFSyMwOZc7ouh_XU.fUXBOk2P0FPy5CzVVtqfikquQlQW3uXHIIE9xxr8pNpSyZrhehHIKJzNMgmw71pyTKhBP0U.19CH0XvsPIRp7JnZwc0fn7FLwJfbSffZY3lJ5QrDbrQT3a4O2zLjAMpd.6.y5FcfpFYNz_92a0iuL4Z7b1j7npYB2ik4Pb5VlW4a6U6Vse6ghKVO57fqWSTapVYXtV7R3wsTznX_SOmf3MTh2IZ9TeLasW4TGjWbuqauXgS.D4rNYkFaNPzoXrhfjK0QhYC0aGYgPXv2XleRm_MLFywwAWB0nQRoKsd.yvfh2WnOnoO8hE0HvtWkGuoOiuTQudaJqn2nhsojszrKPouRyl.S1EsGRaWn_9X4LhYONMlIk2LJyeguZ4HXthTCt4s5f5TolojU4h9lGYoDl61Pokm9FPGSuCuAf9504HsoqK.jNgwZDU8wEnJVvgl2gOCHORzzlLSripGC0cktirisF6WP7831o7SMQZYacyJZ1Gc7ivyw1hhCmHbUVtQ_5lMBDFPfNiAdjvLbUReJdukZY7CSh_Y.x6WTDsIgylvz73GkYcAjbPwgdexxJ1W2UnIwnP8jg8DrpSD8CJliGHBwzSwQea7kEOa6dM_S1i12blv205D9Pb8pTrg5ORxJfGvJZclPIm5AJ3_CMsqyeISLZWRMzVgZ2Dm7Ej1QH7b.BmEp9u2onaQq4MN3hbd3kqc8VZxkusDaPA86RlCRLYcMVXLVDWd6sNjroVQb_13ceY0ZjXHU.z7bBhbtFIsPrZEP_KVlvq9wIujYVrsuUrmZLG05oFWGIWd4vbIBRLj0T4m5YtPnvBny.ZcYyHSHPNumWa7cJkW0ccUDb_3_6hR5l.zGtp_wN7koNz0zkpKJ5NrPqxsBFE0e_S__Boj7bvKnhMIBlLbB2XVc3Hg0_5dwQH6iywmWL23DNdkgdVuoF7OTa7FyiCUsRKrOCAXbcHjMaFgPPUukhEDIRO7.9WunoDoxJv1ppVCF9pigajvRoBggWnxK9jrw6gJA0cLuJQxVu5AK7sKHv5NnGRy5Wyvw2q94_J_bnbe0zuUf10wvjfoc6MKA.0mWoaTdVDst6YvtBce7SX1lJ58y3dETReqaYy4JMZLeLXkpoXwXnwlmdkbiKQWH50SBO"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9135a4dc79db9ccb';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\/search?q=spatial%20histograms&__cf_chl_rt_tk=o72SOJYEKVoAVRJi7E.y4digjbxdU8Ft4ahILzY3Los-1739793909-1.0.1.1-iTAaUo9c2ZN32K6W5VX3lhtwrWGpiPU6aEI9hbDr2co" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>