The models in ncnn/ are converted from the OpenCV Zoo ONNX ports of Google's MediaPipe hand
models, by tools/convert_models.py:

- palm.ncnn.*: palm_detection_mediapipe_2023feb (https://huggingface.co/opencv/palm_detection_mediapipe)
- hand.ncnn.*: handpose_estimation_mediapipe_2023feb (https://huggingface.co/opencv/handpose_estimation_mediapipe)

MediaPipe is Copyright Google LLC. The models and the OpenCV Zoo ports are licensed under the
Apache License, Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0).

Changes made here: converted to ncnn with pnnx, with the palm detector's channel pads
rewritten as ncnn Padding layers, and quantized to 8 bits (the *-int8.ncnn.* files) with
ncnn's tools.