Update README.md

Author: Likecolor

README.md

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 ## Overview
 
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 EdgeCam, an open-source distributed camera system that incorporates inference scheduling and continuous learning for video analytics. 
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 The main implementation details of EdgeCam are shown below.
 
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 | modules | Description |
 | :---: |    :----   |
 | Video Reader | Provides user-friendly interfaces for reading video streams using OpenCV. Supports offline video files and network cameras using the Real-Time Streaming Protocol (RTSP). | VideoProcessor |