Update palm detection model from MediaPipe (2023feb) (#128)

* update to the latest palm detection model

* quantize palm detection model

* make palm aligned to center when resize

* update benchmark for palm detection

* update benchmark data

* update readme

* update a new quantized model

* update readme

demo.py

@@ -91,7 +91,7 @@ def visualize(image, hands, print_result=False):
 
 if __name__ == '__main__':
     # palm detector
-    palm_detector = MPPalmDet(modelPath='../palm_detection_mediapipe/palm_detection_mediapipe_2022may.onnx',
+    palm_detector = MPPalmDet(modelPath='../palm_detection_mediapipe/palm_detection_mediapipe_2023feb.onnx',
                               nmsThreshold=0.3,
                               scoreThreshold=0.8,
                               backendId=args.backend,