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According to the documentation, the function does support multi-channel images hence not just CV_32FC1 as you stated.

Looking into their documentation, it does not seem like they have a GPU version of this method yet. My advise:

1. Read their code (or actual paper) to understand what is happening then maybe leverage the GPU for some of the operations
2. Research online for an optimised version (or GPU-accelerated one)
3. If your task allows, consider resizing your images
4. If all fails, consider looking into multi-threading