utils: tuning: libtuning: Implement math helpers

Implement math helpers for libtuning. This includes:
- Average, a wrapper class for numpy averaging functions
- Gradient, a class that represents gradients, for distributing and
  mapping
- Smoothing, a wrapper class for cv2 smoothing functions

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

utils/tuning/libtuning/smoothing.py

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Copyright (C) 2022, Paul Elder <paul.elder@ideasonboard.com>
+#
+# smoothing.py - Wrapper for cv2 smoothing functions to enable duck-typing
+
+import cv2
+
+
+# @brief Wrapper for cv2 smoothing functions so that they can be duck-typed
+class Smoothing(object):
+    def __init__(self):
+        pass
+
+    def smoothing(self, src):
+        raise NotImplementedError
+
+
+class MedianBlur(Smoothing):
+    def __init__(self, ksize):
+        self.ksize = ksize
+
+    def smoothing(self, src):
+        return cv2.medianBlur(src.astype('float32'), self.ksize).astype('float64')