Meaning of Return value of run_on_chip_calibration (Python)

[am91-gm]

Hi everyone,

I'm currently playing around with the on-chip calibration python API and I have a question about the meaning of the return values, specifically the health indicator.

In C++ the return value for health is documented to be between 0 and 1 (same as running OCC from Realsense Viewer). However when running OCC from python (The example script depth_ucal_example.py from the repository) I'm getting something like this:

Calibration completed
health factor =  (-0.001761582330800593, 0.0)

How do I interpret this value? Is it the same as in C++ (closer to 0 is better)? And what are the threshholds for good/ok/bad results of the OCC?

System Details:
SDK Version: 2.55.1
Camera: D435

[MartyG-RealSense]

Hi @am91-gm Yes, the closer to zero is that the health check score is, the better. The score output is easier to understand if you disregard the minus sign and just treat it as a positive value instead of a negative.

The scale below, taken from the calibration guide at the link below, visually illustrates the thresholds of good / ok / bad (expressed as Good, Could Be Improved and Needs Recalibration, respectively).

https://dev.intelrealsense.com/docs/self-calibration-for-depth-cameras

[am91-gm]

Hi @MartyG-RealSense

Thank you for the quick reply!