134
Figure 3-129
The depth of the field calibration and principles
Here system uses one horizontal line and 3 height lines and the corresponding distance in the actual
world, then it can calculate the camera internal parameters (internal geometric features and optics
features) and external parameters (The 3D positions and direction in the actual world), so it can get the
relative relationship between the 2D images of the camera and the 3D object of the actual world.
Depth of the field calibration setup and notes
Application environments
Use the near or far scene above 3M of the camera installation position. Do not use the scene at the
bottom or at the top of the video.
The calibration is for the horizontal scene, not for tilt corner or surface.
Do not support unusual scene such as wide angle camera or fish eye camera.
Calibration zone setup: The calibration zone shall be in the same surface.
Tilt calibration setup: The bottom of the three tilt gauges shall be at the same surface. They shall
form a triangle and use fixed reference object as the tilt gauge such as the vehicle parking along the
road, or pole. The best way is to arrange a person to stand at these three positions and draw one by
one.
Tilt gauge: Please select the reference object on the ground that you have known the length (The
Summary of Contents for DNA3500 Series
Page 2: ...DNA Network Video Recorder User s Manual V 5 2 0...
Page 123: ...110 Figure 3 98 Figure 3 99 Figure 3 100...
Page 135: ...122 Figure 3 116 Click draw button to draw the zone See Figure 3 117...
Page 139: ...126 Figure 3 120 Click Draw button to draw a zone See Figure 3 121 Figure 3 121...
Page 144: ...131 Figure 3 126 Click draw button to draw the zone See Figure 3 127...
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