How to calculate object distance with Maixduino on k210

My Board: Maixduino
My lib. : OpenMv
My proccessor : K210
I bought a binocular camera. I mark the midpoint of the object I detected. How can I calculate its distance

Hi, I don’t know. I don’t know what that board is.

i am using openmv. this card looks like huskylens.

Please ask on their forums.