نتایج جستجو برای: anomaly detection

تعداد نتایج: 591345  

2015
Nicolas Goix Anne Sabourin Stéphan Clémençon

Let t > 0. Recall that EM∗(t) = α(t) − tλ(t) where α(t) denote the mass at level t, namely α(t) = P(f(X) ≥ t), and λ(t) denote the volume at level t, i.e. λ(t) = Leb({x, f(x) ≥ t}). For h > 0, let A(h) denote the quantity A(h) = 1/h(α(t + h) − α(t)) and B(h) = 1/h(λ(t + h) − λ(t)). It is straightforward to see that A(h) and B(h) converge when h→ 0, and expressing EM∗ ′ = α′(t)−tλ′(t)−λ(t), it s...

Journal: :Pattern Recognition 2016
Ying Zhang Huchuan Lu Lihe Zhang Xiang Ruan

In this paper, we present a novel anomaly detection framework which integrates motion and appearance cues to detect abnormal objects and behaviors in video. For motion anomaly detection, we employ statistical histograms to model the normal motion distributions and propose a notion of “cut-bin” in histograms to distinguish unusual motions. For appearance anomaly detection, we develop a novel sch...

2008
Fernando Silveira Christophe Diot Nina Taft Ramesh Govindan

While network-wide methods have become popular in the anomaly detection literature, there has been no quantitative evaluation of the advantage of such methods. In this paper we provide preliminary results of this analysis. Surprisingly, we observe that most of the anomalies found by a network-wide method are also found by a simpler single-link approach.

2014
Bin Tong Tetsuro Morimura Einoshin Suzuki Tsuyoshi Idé

We propose a novel probabilistic semi-supervised anomaly detection framework for multi-dimensional systems with high correlation among variables. Our method is able to identify both abnormal instances and abnormal variables of an instance.

2015
Huishan Bian Liehuang Zhu Meng Shen Mingzhong Wang Chang Xu Qiongyu Zhang

Monday December 7 08:00-09:00 Registration (3rd Floor Grand Ballroom, GRAND GONGDA JIANGUO HOTEL of Beijing University of Technology) 09:00-09:15 Open remarks 09:15-10:05 Keynote 1 Robert Deng (Singapore Management University) 10:05-10:55 Keynote 2 Wenchang Shi (Renmin University) 10:55-11:15 Tea & Coffee Break 11:15-12:05 Keynote 3 Rob Spiger (Microsoft) 12:05-13:30 Lunch 13:30-15:00 Session 1...

2016
Roman Garnett

MODELING LOCAL VIDEO STATISTICS FOR ANOMALY DETECTION

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function paginate(evt) { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term pg=parseInt(evt.target.text) var data={ "year":filter_year, "term":term, "pgn":pg } filtered_res=post_and_fetch(data,url) window.scrollTo(0,0); } function update_search_meta(search_meta) { meta_place=document.getElementById("search_meta_data") term=search_meta.term active_pgn=search_meta.pgn num_res=search_meta.num_res num_pages=search_meta.num_pages year=search_meta.year meta_place.dataset.term=term meta_place.dataset.page=active_pgn meta_place.dataset.num_res=num_res meta_place.dataset.num_pages=num_pages meta_place.dataset.year=year document.getElementById("num_result_place").innerHTML=num_res if (year !== "unfilter"){ document.getElementById("year_filter_label").style="display:inline;" document.getElementById("year_filter_place").innerHTML=year }else { document.getElementById("year_filter_label").style="display:none;" document.getElementById("year_filter_place").innerHTML="" } } function update_pagination() { search_meta_place=document.getElementById('search_meta_data') num_pages=search_meta_place.dataset.num_pages; active_pgn=parseInt(search_meta_place.dataset.page); document.getElementById("pgn-ul").innerHTML=""; pgn_html=""; for (i = 1; i <= num_pages; i++){ if (i===active_pgn){ actv="active" }else {actv=""} pgn_li="
  • " +i+ "
  • "; pgn_html+=pgn_li; } document.getElementById("pgn-ul").innerHTML=pgn_html var pgn_links = document.querySelectorAll('.mypgn'); pgn_links.forEach(function(pgn_link) { pgn_link.addEventListener('click', paginate) }) } function post_and_fetch(data,url) { showLoading() xhr = new XMLHttpRequest(); xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8'); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { var resp = xhr.responseText; resp_json=JSON.parse(resp) resp_place = document.getElementById("search_result_div") resp_place.innerHTML = resp_json['results'] search_meta = resp_json['meta'] update_search_meta(search_meta) update_pagination() hideLoading() } }; xhr.send(JSON.stringify(data)); } function unfilter() { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":"unfilter", "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } function deactivate_all_bars(){ var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(bar) { bar.dataset.active = false bar.style = "stroke:#71a3c5;" }) } year_chart.on("created", function() { var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(check) { check.addEventListener('click', checkIndex); }) }); function checkIndex(event) { var yrchart = document.querySelectorAll('.ct-bar'); var year_bar = event.target if (year_bar.dataset.active == "true") { unfilter_res = unfilter() year_bar.dataset.active = false year_bar.style = "stroke:#1d2b3699;" } else { deactivate_all_bars() year_bar.dataset.active = true year_bar.style = "stroke:#e56f6f;" filter_year = chart_data['labels'][Array.from(yrchart).indexOf(year_bar)] url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":filter_year, "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } } function showLoading() { document.getElementById("loading").style.display = "block"; setTimeout(hideLoading, 10000); // 10 seconds } function hideLoading() { document.getElementById("loading").style.display = "none"; } -->