Technique
| Motion Activity
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Document
| MPEG-7 Visual (ISO/IEC 15938-3)
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Name
| Ajay Divakaran (Mitsubishi Electric Research Labs.)
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EMail
| ajayd@merl.com
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Contact
| ajayd@merl.com
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Type
| Application
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External Libraries
| none
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Related Ds/DSs
| Video Segment DS
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Used Ds/DSs
| none
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Input
| Video
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Extraction
| Yes
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Client Appl
| Search & Retrieval
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Summary
| This library implements the motion activity descriptor which consists of one primary and four secondary attributes. The primary attribute is the intensity of motion activity, and the other four attributes express the dominant direction, the spatial distribution, the temporal distribution and the spatial localization of motion activity. Since the feature vector is short, a simple absolute distance or squared distance criterion can be used for matching.
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Strong Points
| The descriptor is compact and extremely effective as a filter for reduction of large search spaces.
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Limitations
| The program depends on previously computed motion vectors. It does not have its own motion estimation. This was done to maintain format independence.
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Known Problems
| None.
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Parameters
| None.
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