how to solve depth inaccuracy at short range

yass1802

Hello,

carrying on based on this issue depth_inaccuracy luxonis/depthai-pythonissues/812:

I am experiencing depth measurement inaccuracies of about 1–2 cm at short ranges (maximum distance 50 cm). In my setup, rotating or repositioning the camera is not an option. For example, when I set the camera to 42.5 cm, it consistently reports 44.2 cm. I am using the OAK-D Pro and need accurate short-range measurements.

I have set manual focus and already enabled Extended Disparity Mode with Left-Right Check, tried Disparity Shift, and tested both Face and High-Density modes, but the discrepancies persist. I am also using RGB-depth alignment.

Since depth accuracy is critical for my application, are there additional settings, calibration techniques, or processing approaches that could improve depth precision under these constraints, or am I missing something? :

jakaskerl

Hi @yass1802
So it sounds like you are experiencing accuracy oscillations? The depth is rather accurate but periodically at certain distances, the error is much more pronounced -https://docs.luxonis.com/hardware/platform/depth/depth-accuracy/#Depth%20Accuracy-Measurement%20setup-Accuracy%20oscillation

Thanks,
Jaka

yass1802

Hi @jakaskerl,

I’m measuring depth in the 36–50 cm range (verified using a ruler), and I consistently observe a 1–2 cm discrepancy between the camera-reported depth and the actual measured distance.

I understand this offset may be related to disparity quantization or sub-pixel estimation effects.Is there a recommended approach to further reduce this short-range depth error maximum (4mm of difference to truth is as a maximum that is acceptable for my application )

Thanks ,

Yas