Add HSV test

tuto_vision/test_hsv.py

+import cv2
+import numpy as np
+
+# connect to a sensor (0: webcam)
+cap=cv2.VideoCapture(0)
+
+# capture an image
+ret, frame=cap.read()
+
+# Select ROI
+r = cv2.selectROI(frame)
+
+# Crop image
+imCrop = frame[int(r[1]):int(r[1]+r[3]), int(r[0]):int(r[0]+r[2])]
+
+average_h = np.mean(imCrop[:,:,0])
+average_s = np.mean(imCrop[:,:,1])
+average_v = np.mean(imCrop[:,:,2])
+
+print(average_h,average_s,average_v)
+
+# Display cropped image
+cv2.imshow("Image", imCrop)
+cv2.waitKey(0)