[FEAT] Add motion detection script using OpenCV

Author: AryanDhanuka10

computer_vision/motion_detection.py

@@ -0,0 +1,30 @@
+import cv2
+
+def detect_motion(video_source=0):
+    cap = cv2.VideoCapture(video_source)
+    ret, frame1 = cap.read()
+    ret, frame2 = cap.read()
+
+    while cap.isOpened():
+        diff = cv2.absdiff(frame1, frame2)
+        gray = cv2.cvtColor(diff, cv2.COLOR_BGR2GRAY)
+        blur = cv2.GaussianBlur(gray, (5,5), 0)
+        _, thresh = cv2.threshold(blur, 20, 255, cv2.THRESH_BINARY)
+        dilated = cv2.dilate(thresh, None, iterations=3)
+        contours, _ = cv2.findContours(dilated, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
+
+        for contour in contours:
+            if cv2.contourArea(contour) < 1000:
+                continue
+            (x, y, w, h) = cv2.boundingRect(contour)
+            cv2.rectangle(frame1, (x, y), (x+w, y+h), (0, 255, 0), 2)
+
+        cv2.imshow("Motion Detection", frame1)
+        frame1 = frame2
+        ret, frame2 = cap.read()
+
+        if not ret or cv2.waitKey(40) == 27:
+            break
+
+    cap.release()
+    cv2.destroyAllWindows()