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Extracting intrinsic calibration parameters from an android device's camera using the camera2 API is known to be problematic.

However the guidance has been that if the phone supports the DEPTH_OUTPUT capability, it is guaranteed to also provide camera intrinsics (via LENS_INTRINSIC_CALIBRATION).

This is stated in the following sources:

[The DEPTH_OUTPUT] capability requires the camera device to support the following:

  • This camera device, and all camera devices with the same android.lens.facing, will list the following calibration metadata entries in both CameraCharacteristics and CaptureResult:
    • android.lens.intrinsicCalibration

Still, the Huawei P30 Pro claims to support the DEPTH_OUTPUT capability but does not provide any useful intrinsics (all intrinsic parameters are zero).

For what it's worth, the Huawei P30 Pro's support for the camera2 API is INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED, but this should not matter, as neither of the sources cited above give any conditions on the device's camera2 API support level for extracting intrinsics.

Could anyone please help?

cptjacksparrow
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  • I'm not sure about the DEPTH_OUTPUT, but from my experience with Xiaomi/Huawei they are far from implementing the Camera2 spec. – gioravered Sep 14 '22 at 07:20
  • @gioravered Many thanks for your insight -- yes, it looks like it. I'm forming the suspicion that the documentation's claim (DEPTH_OUTPUT guarantees intrinsics) holds only for devices with a certain support level and above. But this is not stated anywhere as far as I have read. – cptjacksparrow Sep 14 '22 at 07:31

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