Philip

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  • Video Surveillance Systems

  • Created: Sep 17, 2014

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Summary

Surveillance is the monitoring of activities and gathering information (usually people) for a lot of purpose (e.g. investigation). This video surveillance can produce recording of images and activity that occur at the time it was activated for the purpose of gathering information.

This project is designed by the author as an automated and self-recording surveillance camera that uses a gigabyte-class flash card as the recording media. The PIR triggers a software block, the recorder, which is in charge of deciding if and how many pictures to take according to its trigger inputs and operating mode. The recorder controls the camera driver (another software module) in order to get the JPEG byte stream. The real-time clock is an hardware feature of the AVR controller, and the recorder uses it both for time-stamping the JPEG files with current date and time, and as an interval timer if time-lapse photography mode is selected. After time-stamping, the recorder hands over picture data to the file system, which stores it permanently on the SD-card.

The system was built from a VGA CMOS colour camera, a passive-infrared (PIR) movement sensor, an ATmega32 processor, and a 1GB SD-card. The 1GB card can store 50,000 colour frames, with a definition similar to industrial VHS-CCTV recorders (320x200), taking a new picture every 2.5 or 3 seconds. On most typical domestic environments, this translates to more than one month of images before overwriting the oldest frames. The recording system is flexible, allowing to choose between PIR activated, timer, continuous and externally triggered recording modes. You can decide what intervals to use and how many extra frames to take after a trigger ends.

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