How to calculate true depth from relative depth values ?

[pragathiacharya]

Depth image contains pixel values ranging from 0 to 255, it seems the depth values are not directly in meters but are instead encoded in a normalized format or as 8-bit intensity values. To convert these values to actual depth in meters, you need to understand the scale or conversion factor used to encode the depth values.
Can anyone please help find the conversion factor as I want to estimate the true distance from the depth image.

[LiheYoung]

Hi, you need to provide some true metric depth values to align the relative depth to metric depth by fitting a scale and a shift.

[C-hongfei]

Hi, you need to provide some true metric depth values to align the relative depth to metric depth by fitting a scale and a shift.

Hi, Can the results obtained using metric_depth method be used to calculate true distances without a scale? Is it possible to obtain true 3D coordinates?