Measurement error XY coordinates

emily

I am performing a simple test measuring a point in space and although the depth indicates it correctly I observe errors in the measurement of X and Y. For example, a point located at X= 0mm, Y=160mm,
Z = 510 mm and gives me a measurement of X= -7, Y = 196, Z = 509.... What could I be configuring wrong?
Thank you in advance for any guidance you can give me 🙂

erik

Hi emily ,
From my understanding, you have an object at 51cm (which is correct), but the X/Y isn't correct? If so, how off is it (what's the error)?
Thanks, Erik

emily

erik Hi Erik, thank you very much for your reply ...
The error at an real measurement of X= 0mm, Y = 160mm I get a camera measurement of X= -7 and Y=197 the error in Y is larger than the ~ 37 mm, the error is about 1.23% but it is not constant it increases as you move the point to be measured away from the center.

erik

Hi emily ,
What about the Z error? As X/Y are calculated from the Z (see here).
Thanks, Erik

emily

Hello,

I have tested with another camera of the same model OAK-D, where The actual dimensions of the point are X = 5mm, Y = 130mm, Z= 509mm. and in this case the depth error is 2 mm and the Y error is about 25mm...

What can I do to improve this result?
Any example of the above but in c++ instead of pyton?

erik

Hi emily ,
Are you measuring X/Y from the centroid of the bounding box? Regarding C++ - not really, but chatgpt works does impressive job at translating from one coding language to another🙂
Thanks, Erik