Sparse Reconstruction Cost for Abnormal Event Detection pot

... is 0.8s/frame for GAE, 3.8s/frame for UCSD dataset, and 4.6s/frame for the Subway dataset. 5. Conclusion We propose a new criterion for abnormal event detec- tion, namely the sparse reconstruction cost ... con- tains one abnormal event. Three different levels of mea- surements are applied for evaluation, which are Pixel-level, Frame-level and Event- level measurements....

Ngày tải lên: 30/03/2014, 16:20

... that there is no need for unusual event training data for our approach. For the un- supervised HMM, there is no need for training data. The percentage of frames for unusual events in the test sequence is ... Two standard HMM models, one for usual events and one for unusual events, are trained using manually labeled training data according to E quation 1. For testing, the ev...

Ngày tải lên: 19/02/2014, 18:20

... Association for Computational Linguistics:shortpapers, pages 693–698, Portland, Oregon, June 19-24, 2011. c 2011 Association for Computational Linguistics Using Derivation Trees for Treebank Error Detection Seth ... and points on either side). See Dickinson and Meur- ers (2003b) for details. This work forms the basis for the DECCA system. 1 2.2 Motivation for Our Approach (2) a...

Ngày tải lên: 17/03/2014, 00:20

... use these annotations for formal evaluation — only for selecting items for our dataset — we do not carry out an inter- annotator agreement study here. We eliminate any lemma for which we find evidence ... gold-standard information on sense granularity for each target word, and is done to establish an upper bound score for LDA. We then relax the assumption, and use a fixed T setting...

Ngày tải lên: 17/03/2014, 22:20

... performance of burst detection. We use TVBurst as the default burst detection algorithm in later experiments. Then we compare the performance of differ- ent text representation models for event ... amount of space for storage and time for downstream processing. To address these difficulties, in this paper, we pro- pose a burst based text representation method for scalable event...

Ngày tải lên: 23/03/2014, 14:20

... Latent Temporal Structure for Complex Event Detection ∗ Kevin Tang Li Fei-Fei Daphne Koller Computer Science Department, Stanford University {kdtang,feifeili,koller}@cs.stanford.edu Abstract In this ... d max for all states and the number of states S for our model. The potentials are defined in terms of parameters w of our model that will be learned. The first potential is a singleton...

Ngày tải lên: 30/03/2014, 16:20

... the Association for Computational Linguistics, pages 69–72, Avignon, France, April 23 - 27 2012. c 2012 Association for Computational Linguistics A Support Platform for Event Detection using ... with facility for rich user interaction. Our starting in the development of this system was the Ushahidi platform, 1 which has high up- take for social media surveillance and informatio...

Ngày tải lên: 08/03/2014, 21:20

... points for each event, which aided this process. Using this information, a window from the start of the event to the end of the crowd response was created, for each true event. To measure performance, ... a larger training sample performed better. 3.2 Event Detection Results To measure the event detection approach, we gathered match reports and de- tailed game statistics for...

Ngày tải lên: 23/03/2014, 13:20

... charge for disposal) • Other costs (plastic bags, spray paint, wood for tops, gas for truck) = $25 • Total costs = $125 Savings from Avoided Disposal Cost: The difference between the cost ... Plans developed for the six participant events include cost and saving information. As a percent of total spending on an event, waste disposal tends to be small. As a result, the p...

Ngày tải lên: 16/03/2014, 11:20

... as event detection sensors, e.g., – Solar cells, for light; – Unbiased microphones, for audio; – Piezoelectric elements, for vibration; and – Peltier elements, for temperature differences. • Event ... output characteristics solely for the purpose of event detection. For example, in the ACM applica- tion, the geophone is used to detect events. However, upon detecting an ev...

Ngày tải lên: 23/03/2014, 13:20