CODEWITHSUNDEEP
opencvcameracomputer-visioncamera-calibration
vacky
vacky

Reputation: 287

Finding Intrinsic parameters of a Digital Camera

What is the best way to find the intrinsic parameters of a Digital Camera? I have tried using the opencv Camera Calibration tool but it gives me different values after every calibration. So Im not sure if it is correct or not. Whereas the same method works perfectly fine for a USB camera.

I am not sure if the process to get intrinsic parameters for digital camera is slightly different and if im missing something.

If someone has any clue regarding this... please help!

Upvotes: 0

Views: 1014

Answers (1)

Francesco Callari
Francesco Callari

Reputation: 11825

Changes in ISO and white balance happen "behind" the lens+sensor combo, so they cannot directly affect the calibrated geometry model of the camera.

However, they may affect the results of a calibration procedure by biasing the locations of the detected features on whatever rig you are using ("checkerboard" or similar) - anything that affects the appearance of grayscale gradients can potentially do that.

The general rule is: "Find the lens and exposure settings that work for your application (not the calibration), then lock them down and disable any and all auto-gizmo features that may modify them". If those settings don't work for the particular calibration setup you are using, change it (for example, dim the lights or switch the target pattern to gray/black from white/black if the application lighting causes the target to be overexposed/saturated).

Upvotes: 1

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