Documentation for C-Werk 2.0.

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The following table contains the requirements for cameras to enable the effective operation of the Visitors counter:

Camera:

  • resolution: 720 х 576 (CIF4) or 360 х 288 (CIF1) pixel resolution. Using pixel resolutions higher than CIF4 do not lead to higher recognition accuracy;
  • frames per second: 25;
  • color: color camera is obligatory;
  • no camera jitter is allowed.

Illumination:

  • best recognition results are achieved under moderate illumination. If the scene is under- or over-illuminated, the recognition accuracy may drop down;
  • sharp changes in illumination may lead to improper operation of analytics.

Scene and viewing angle:

  • vertically downward position is the best for the purpose. The closer to vertical, the more accurate counting;
  • camera FOV dimensions: min. 2 x 2m, optimal 4 x 4m;
  • the background must be primarily static and not undergo sudden changes;
  • the counting area must not contain any moving objects except for humans;
  • reflective surfaces and harsh shadows from moving objects can affect the quality of analytics;
  • leafage, TV screens or any periodic object movement in the background may cause analytics glitches;
  • if possible, avoid obstruction of the humans by static objects such as pillars, trees, etc.

Images of objects within the scene:

Other requirements:

  • the visitors must not move in a continuous flow; smaller groups of humans are counted correctly.
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Requirements for the person size in the frame