If I have depth map, how can I get normal map?

[Hedgehhog]

No description provided.

[kcheng1021]

You can use the methods converting depth to normal. More details can be refered to some awesome works, like Virtual Normal: Enforcing Geometric Constraints for Accurate and Robust Depth Prediction, VCR-GauS: View Consistent Depth-Normal Regularizer for Gaussian Surface Reconstruction.