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OpenCV/tutoriel7/README.md

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+# Tutoriel OpenCV
+## Gestion des évènements souris
+
+La vidéo du tutoriel est à l'adresse:
+https://www.youtube.com/watch?v=jLPSnlaAnb4
+
+

OpenCV/tutoriel7/detection_couleur_v2.py

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+import cv2
+import numpy as np
+
+def souris(event, x, y, flags, param):
+    global lo, hi, color
+    if event==cv2.EVENT_LBUTTONDBLCLK:
+        color=image[y, x][0]
+    if event==cv2.EVENT_MOUSEWHEEL:
+        if flags<0:
+            if color>5:
+                color-=1
+        else:
+            if color<250:
+                color+=1
+    lo[0]=color-5
+    hi[0]=color+5
+
+color=100
+lo=np.array([color-5, 100, 50])
+hi=np.array([color+5, 255,255])
+color_info=(0, 0, 255)
+cap=cv2.VideoCapture(0)
+cv2.namedWindow('Camera')
+cv2.setMouseCallback('Camera', souris)
+while True:
+    ret, frame=cap.read()
+    image=cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
+    image=cv2.blur(image, (5, 5))
+    mask=cv2.inRange(image, lo, hi)
+    mask=cv2.erode(mask, None, iterations=1)
+    mask=cv2.dilate(mask, None, iterations=1)
+    image2=cv2.bitwise_and(frame, frame, mask= mask)
+    elements=cv2.findContours(mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)[-2]
+    if len(elements) > 0:
+        c=max(elements, key=cv2.contourArea)
+        ((x, y), radius)=cv2.minEnclosingCircle(c)
+        if radius>30:
+            cv2.circle(frame, (int(x), int(y)), 5, color_info, 10)
+            cv2.line(frame, (int(x), int(y)), (int(x)+150, int(y)), color_info, 2)
+            cv2.putText(frame, "Objet !!!", (int(x)+10, int(y) -10), cv2.FONT_HERSHEY_DUPLEX, 1, color_info, 1, cv2.LINE_AA)
+    cv2.putText(frame, "Couleur: {:d}".format(color), (10, 30), cv2.FONT_HERSHEY_DUPLEX, 1, color_info, 1, cv2.LINE_AA)
+    cv2.imshow('Camera', frame)
+    cv2.imshow('image2', image2)
+    cv2.imshow('Mask', mask)
+    if cv2.waitKey(1)&0xFF==ord('q'):
+        break
+cap.release()
+cv2.destroyAllWindows()