Video Synopsis by wikipedia

Video synopsis (often abbreviated V.S.) is an approach to create a short video summary of a long video. It tracks and analyzes moving objects (also called events), and converts video streams into a database of objects and activities.^[1] The technology has specific applications in the field of video surveillance where, despite technological advancements and increased growth in the deployment of CCTV (closed circuit television) cameras,^[2]viewing and analysis of recorded footage is still a costly and labor-intensive and time-intensive task.

Video Synopsis combines a visual summary of stored video together with an indexing mechanism.

 

When a summary is required, all objects from the target period are collected and shifted in time to create a much shorter synopsis video showing maximum activity. A synopsis video clip is generated, in real time, in which objects and activities that originally occurred in different times are displayed simultaneously.^[3] (See Figure 1 - Screen shots: Before and after Video Synopsis).

 

The process begins by detecting and tracking objects of interest. Each object is represented as a "tube" in "space-time" of all video frames. Objects are detected and stored in a database in approximately real time.

 

Following a request to summarize a time period, all objects from the desired time are extracted from the database, and indexed to create a much shorter summary video containing maximum activity. (See Figure 2 - Tube packing).

 

Real time rendering is used to generate the summary video after object re-timing. This allows end-user control over object/event density.

 

Video Synopsis technology was invented by Prof. Shmuel Peleg^[4] of The Hebrew University of Jerusalem, Israel, and is being developed under commercial license by BriefCam, Ltd