Signal Processing Asked by UXkQEZ7 on February 21, 2021
https://en.wikipedia.org/wiki/Depth_map
https://en.wikipedia.org/wiki/Range_imaging
To me, it sounds like they are the same thing, except depth map implies only having the z coordinate info.
But then again, if you have a range image vs depth image, is this something one can tell the difference by examining the data or is the term mostly contextual?
Your understanding is correct, it's z-values vs distances.
A depth map contains the distances of points in the scene to a plane.
A range image contains the distances of points in the scene to another point. This point is very often the camera's position.
For a depth map the plane that the distances are computed with respect to can be any plane, but it is often parallel to the image plane. Examples of common planes:
If you of the same scene have:
these two images will look very similar, and it's not possible to conclude whether it's a range image or depth map, unless you have something you know is a plane in the image.
Answered by Atnas on February 21, 2021
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