projects
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projects [2013/10/20 15:15] pszwed [Fuzzy Semantic Petri Nets] |
projects [2013/10/21 03:16] pszwed [Fuzzy Semantic Petri Nets] |
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| *The Petri net defines a scenario of an event (or a process, if you like), its places correspond to the scenario steps | *The Petri net defines a scenario of an event (or a process, if you like), its places correspond to the scenario steps | ||
| *Tokens in FSPN represent combinations of objects participating in the event. They are attributed with weights expressing likelihood of a scenario step occurrence | *Tokens in FSPN represent combinations of objects participating in the event. They are attributed with weights expressing likelihood of a scenario step occurrence | ||
| - | *Guards in FSPN are conjunctions of fuzzy predicates referencing the coupled ontology | + | *Guards in FSPN are conjunctions of fuzzy predicates referencing the assertions in the coupled ontology |
| FSPN were applied to the problem of video event recognition. In the presented example an abandonned laguagge is correctly detected. (The event scenario and the dataset were published at [[http://www.cvg.rdg.ac.uk/PETS2006/|PETS 2006 Workshop]]) . | FSPN were applied to the problem of video event recognition. In the presented example an abandonned laguagge is correctly detected. (The event scenario and the dataset were published at [[http://www.cvg.rdg.ac.uk/PETS2006/|PETS 2006 Workshop]]) . | ||
| Scenario: | Scenario: | ||
| - | -A man enters the scene and is still for some time | + | -A man ''x'' enters the scene and is still for some time |
| - | -Then he takes his rucksack off and puts it on the floor | + | -Then he takes his rucksack ''y'' off and puts it on the floor. He stays close to it for some time. The rucksack should not move ''isStill(y)''. |
| - | -He stays close to the luggage for some time. | + | -Next, he leaves the rucksack unattended (the object is classified //unattended// if the distance between it and its owner is greater than 3 m). The luggage should remain still. |
| - | -He leaves the rucksack unattended (the object is classified //unattended// if the distance between it and its owner is greater than 3 m) | + | -Finally, the man disappears: ''noObject(x)''. The luggage rest still and unattended (possible bomb planting) |
| - | -Finally, the man disappears. | + | |
| + | The listed above steps correspond to the places of FSPN specifying the scenario. Transition guards define the conditions that should be satisfied to reach the next step. | ||
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| + | {{:projects:pets-scenario.png?600}} | ||
| The clip below shows the GUI of a software, that internally usess the FSPN approach to recognize video events. | The clip below shows the GUI of a software, that internally usess the FSPN approach to recognize video events. | ||
projects.txt · Last modified: 2014/07/07 14:55 (external edit)
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