B0179: angle of view and parameters

Nvidia Jetson Nano/NX Cameras
1
  1. Where did you get the camera module(s)?
    Arducam IMX219 Wide Angle Camera Module for NVIDIA Jetson Nano
  2. Model number of the product(s)?
    B0179
  3. What hardware/platform were you working on?
    Pen and paper
  4. Instructions you have followed. (link/manual/etc.)
    Trigonometry
  5. Problems you were having?
    Cannot reconcile stated parameters with my calculations
  6. The dmesg log from your hardware?
    n/a
  7. Troubleshooting attempts you’ve made?
    internet search, recalculations
  8. What help do you need?
    Determine parameters of the sensor and lens

I need parameters of the sensor and lens to do some calculations to check whether this camera will fit my use case but I cannot make sense of the stated parameters.
It says that the sensor used is IMX217, the stated diagonal FOV is 175 Deg, effective focal length is 2.5mm.

The sensor’s diagonal is 4.6mm.

Assuming stereographic projection:
half_diagonal = 2 * focal_length * tan(half_fov / 2)
This gives us:
4.6mm / 2 = 2 * 2.5mm * tan((175Deg / 2 / 2))
2.3mm = 5mm * tan(43.75Deg)
2.3mm = 5mm * tan(43.75 * pi / 180)
2.3mm = 5mm * 0.96
2.3mm = 4.8mm ← Which is not close at all, so what gives? What’s wrong? What are the parameters or what mistakes I am making?

2

@prrhh

You are right, this value is indeed wrong, thanks for your feedback, we will correct it immediately.

However, the specific information needs to be re-measured, and the document will be updated in about 3-4 days.

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