How to get depth values from the depth PNG image?

[kcshum]

| Camera Model | D435 |
| Firmware Version | 05.11.06.250 |
| Operating System & Version | Win 10 |
| SDK Version | 2.24.0 |

I have converted a recorded bag file to RGB and depth image(PNG format) using rs-converter. Now I want to get the depth values of each pixel directly from the depth image without using the RealsenseD435 device.

I noticed that there is a similar issue posted before. For the code provided(#2200 (comment)), 'cout << frame.at(i,j)[0]<< frame.at(i,j)[1]<< frame.at(i,j)[2]<< endl;' gets three values from the png file.

I am wondering what these three values mean for the depth image. Do I need to do some extra work to get the actual depth value? Do all these three values represent a single pixel?

Looking for your reply.

[MartyG-RealSense]

If you wanted to get depth data from a saved file, I would be inclined to use the rs-convert tool to convert the bag to .raw format instead of .png. With PNG, depth data will be be lost when the PNG is created, whilst a .raw file preserves the depth information.

#3640

The link below provides some code for getting depth information from a .raw file.

#2231 (comment)

[dorodnic]

As discussed here several times before, there is no effective way to get depth back from PNG representation.

[kcshum]

Thank you for your reply. It solved my problem.