Why is the depth map read by the sample/undistort slightly smaller?

[TitansWhale]

Describe the bug

I used the sample/undistort example provided by the SDK to generate an undistorted depth map and saved it as a PNG file. I also saved the point cloud using the SDK. However, when I tried to reconstruct the point cloud from the undistorted depth map using the intrinsic parameters in Python, I found that it did not align with the point cloud generated by the SDK.

The green points represent the original point cloud, while the red points represent the point cloud generated from the depth map.

To Reproduce

Expected behavior

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Additional context