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Be careful that the lines are drawn with accuracy, since an error in this step may negatively affect
the results of the calibration.
Fig. 75: Draw crossroad lines to define the road
AI-ROAD 3D: 3D calibration – Step 3 - Case A
This way to perform the calibration is the most accurate but it requires some attempts to find the
right value of the focal lengt. Therefore AI-ROAD 3D: 3D calibration – Step 3 - Case B, p. 112 might be
more comfortable.
Provide the camera lens parameters
Fig. 76: Provide the camera lens parameters
Focal length: this value normally is provided on the cameras datasheet as a range between the minimum
and the maximum focal length (e.g. 5.2-62.4 mm. For varifocal cameras the specific value depends on the
zoom. Therefore, it is necessary to make a few attempts until you can find the right value in the.
AI-TRAFFIC
AI-ROAD 3D
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