Create virtualpainter.py

Author: 770navyasharma

OpenCV Projects/VirtualPainter/virtualpainter.py

@@ -0,0 +1,52 @@
+
+#### File: `virtual_painter.py`
+```python
+import cv2
+import numpy as np
+
+# Set up the color ranges for detection (e.g., blue pen)
+lower_blue = np.array([100, 150, 0])
+upper_blue = np.array([140, 255, 255])
+
+# Initialize a blank canvas to draw on
+canvas = np.zeros((480, 640, 3), dtype="uint8")
+
+# Start video capture
+cap = cv2.VideoCapture(0)
+
+while True:
+    ret, frame = cap.read()
+    if not ret:
+        break
+
+    # Convert to HSV color space for color detection
+    hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
+
+    # Create a mask for detecting the blue color
+    mask = cv2.inRange(hsv, lower_blue, upper_blue)
+    
+    # Find contours of the detected blue object
+    contours, _ = cv2.findContours(mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
+    
+    if contours:
+        # Get the largest contour (assuming it's the pen)
+        max_contour = max(contours, key=cv2.contourArea)
+
+        # Get the center of the contour (i.e., the tip of the pen)
+        (x, y), radius = cv2.minEnclosingCircle(max_contour)
+        center = (int(x), int(y))
+        
+        # Draw on the canvas at the detected position
+        cv2.circle(canvas, center, 5, (255, 0, 0), -1)
+
+    # Merge the original frame with the canvas
+    combined = cv2.add(frame, canvas)
+
+    # Display the result
+    cv2.imshow('Virtual Painter', combined)
+    
+    if cv2.waitKey(1) & 0xFF == ord('q'):
+        break
+
+cap.release()
+cv2.destroyAllWindows()