visualize height of hands

[PaulaScharf]

Ideas:

• saturation & brightness: black when far away, bright color when near

• transparency: more transparent the further away

• pro: doesnt occlude background

[PaulaScharf]

I have added the branch feature/visDepth. Currently the height is visualized with a decrease of saturation and brightness.
I also tried to change the transparency but came to the conclusion that it is not possible (or at least not reasonable) with our setup.

The main problem is currently the lack of accuracy of depth values. They sometimes jump to unreasonable values. Maybe there is an issue with the code or we need a better camera. If the issue is not resolved it doesnt make much sense to use depth values at all in my opinion.

[PaulaScharf]

There actually was an issue with my code... It is resolved now and works much better :)

Also the height visualization is now done seperatly for each hand.

[PaulaScharf]

the feature branch is now successfully pulled into the master :)

[PaulaScharf]

couldnt we just color in the depth image? Like it is visualized in the realsense viewer