Update app.py

app.py

@@ -13,10 +13,13 @@ model = YOLO("best.pt")
 # Constants for LBW decision and video processing
 STUMPS_WIDTH = 0.2286  # meters (width of stumps)
 BALL_DIAMETER = 0.073  # meters (approx. cricket ball diameter)
-FRAME_RATE = 20  # Input video frame rate (reduced to 20 FPS)
-SLOW_MOTION_FACTOR = 3  # Adjusted for 20 FPS (slower playback without being too slow)
+FRAME_RATE = 20  # Input video frame rate
+SLOW_MOTION_FACTOR = 3  # Adjusted for 20 FPS
 CONF_THRESHOLD = 0.25  # Confidence threshold for detection
-IMPACT_ZONE_Y = 0.85  # Fraction of frame height where impact is likely (near stumps)
+IMPACT_ZONE_Y = 0.85  # Fraction of frame height for impact zone
+PITCH_ZONE_Y = 0.75  # Fraction of frame height for pitch zone
+IMPACT_DELTA_Y = 50  # Pixels for detecting sudden y-position change
+STUMPS_HEIGHT = 0.711  # meters (height of stumps)
 
 def process_video(video_path):
     if not os.path.exists(video_path):
@@ -37,11 +40,11 @@ def process_video(video_path):
         results = model.predict(frame, conf=CONF_THRESHOLD)
         detections = 0
         for detection in results[0].boxes:
-            if detection.cls == 0:  # Assuming class 0 is the ball
+            if detection.cls == 0:  # Class 0 is the ball
                 detections += 1
                 x1, y1, x2, y2 = detection.xyxy[0].cpu().numpy()
                 ball_positions.append([(x1 + x2) / 2, (y1 + y2) / 2])
-                detection_frames.append(frame_count - 1)  # Store frame index (0-based)
+                detection_frames.append(frame_count - 1)  # 0-based index
                 cv2.rectangle(frame, (int(x1), int(y1)), (int(x2), int(y2)), (0, 255, 0), 2)
         frames[-1] = frame
         debug_log.append(f"Frame {frame_count}: {detections} ball detections")
@@ -54,36 +57,38 @@ def process_video(video_path):
 
     return frames, ball_positions, detection_frames, "\n".join(debug_log)
 
-def estimate_trajectory(ball_positions, frames):
+def estimate_trajectory(ball_positions, detection_frames, frames):
     if len(ball_positions) < 2:
-        return None, None, None, "Error: Fewer than 2 ball detections for trajectory"
-    
+        return None, None, None, None, None, "Error: Fewer than 2 ball detections for trajectory"
     frame_height = frames[0].shape[0]
-    
+
     # Extract x, y coordinates
     x_coords = [pos[0] for pos in ball_positions]
     y_coords = [pos[1] for pos in ball_positions]
-    times = np.arange(len(ball_positions)) / FRAME_RATE
+    times = np.array(detection_frames) / FRAME_RATE
 
-    # Detect the pitch point: find when the ball touches the ground
-    pitch_point = None
+    # Pitch point: first detection or when y exceeds PITCH_ZONE_Y
+    pitch_idx = 0
     for i, y in enumerate(y_coords):
-        if y > frame_height * 0.75:  # Threshold for ground contact (near the bottom of the frame)
-            pitch_point = ball_positions[i]
+        if y > frame_height * PITCH_ZONE_Y:
+            pitch_idx = i
             break
-    
-    # Find impact point (closest to batsman, near stumps)
+    pitch_point = ball_positions[pitch_idx]
+    pitch_frame = detection_frames[pitch_idx]
+
+    # Impact point: sudden y-change or y exceeds IMPACT_ZONE_Y
     impact_idx = None
-    for i, y in enumerate(y_coords):
-        if y > frame_height * IMPACT_ZONE_Y:  # Ball is near stumps/batsman
+    for i in range(1, len(y_coords)):
+        if (y_coords[i] > frame_height * IMPACT_ZONE_Y or
+            abs(y_coords[i] - y_coords[i-1]) > IMPACT_DELTA_Y):
             impact_idx = i
             break
     if impact_idx is None:
-        impact_idx = len(ball_positions) - 1  # Fallback to last detection
-    
+        impact_idx = len(ball_positions) - 1
     impact_point = ball_positions[impact_idx]
+    impact_frame = detection_frames[impact_idx]
 
-    # Use positions up to impact for interpolation
+    # Use only detected positions for trajectory
     x_coords = x_coords[:impact_idx + 1]
     y_coords = y_coords[:impact_idx + 1]
     times = times[:impact_idx + 1]
@@ -92,111 +97,124 @@ def estimate_trajectory(ball_positions, frames):
         fx = interp1d(times, x_coords, kind='linear', fill_value="extrapolate")
         fy = interp1d(times, y_coords, kind='quadratic', fill_value="extrapolate")
     except Exception as e:
-        return None, None, None, f"Error in trajectory interpolation: {str(e)}"
+        return None, None, None, None, None, f"Error in trajectory interpolation: {str(e)}"
 
-    # Project trajectory (detected + future for LBW decision)
+    # Trajectory for visualization (detected frames only)
+    vis_trajectory = list(zip(x_coords, y_coords))
+
+    # Full trajectory for LBW (includes projection)
     t_full = np.linspace(times[0], times[-1] + 0.5, len(times) + 10)
     x_full = fx(t_full)
     y_full = fy(t_full)
-    trajectory = list(zip(x_full, y_full))
+    full_trajectory = list(zip(x_full, y_full))
 
-    return trajectory, pitch_point, impact_point, "Trajectory estimated successfully"
+    debug_log = (f"Trajectory estimated successfully\n"
+                 f"Pitch point at frame {pitch_frame + 1}: ({pitch_point[0]:.1f}, {pitch_point[1]:.1f})\n"
+                 f"Impact point at frame {impact_frame + 1}: ({impact_point[0]:.1f}, {impact_point[1]:.1f})")
+    return full_trajectory, vis_trajectory, pitch_point, pitch_frame, impact_point, impact_frame, debug_log
 
-def lbw_decision(ball_positions, trajectory, frames, pitch_point, impact_point):
+def lbw_decision(ball_positions, full_trajectory, frames, pitch_point, impact_point):
     if not frames:
         return "Error: No frames processed", None, None, None
-    if not trajectory or len(ball_positions) < 2:
+    if not full_trajectory or len(ball_positions) < 2:
         return "Not enough data (insufficient ball detections)", None, None, None
 
     frame_height, frame_width = frames[0].shape[:2]
     stumps_x = frame_width / 2
-    stumps_y = frame_height * 0.9  # Position of the stumps at the bottom of the frame
+    stumps_y = frame_height * 0.9
     stumps_width_pixels = frame_width * (STUMPS_WIDTH / 3.0)
 
     pitch_x, pitch_y = pitch_point
     impact_x, impact_y = impact_point
 
-    # Check pitching point - the ball should land between stumps
+    # Check pitching point
     if pitch_x < stumps_x - stumps_width_pixels / 2 or pitch_x > stumps_x + stumps_width_pixels / 2:
-        return f"Not Out (Pitched outside line at x: {pitch_x:.1f}, y: {pitch_y:.1f})", trajectory, pitch_point, impact_point
+        return f"Not Out (Pitched outside line at x: {pitch_x:.1f}, y: {pitch_y:.1f})", full_trajectory, pitch_point, impact_point
 
-    # Check impact point - the ball should hit within the stumps area
+    # Check impact point
     if impact_x < stumps_x - stumps_width_pixels / 2 or impact_x > stumps_x + stumps_width_pixels / 2:
-        return f"Not Out (Impact outside line at x: {impact_x:.1f}, y: {impact_y:.1f})", trajectory, pitch_point, impact_point
+        return f"Not Out (Impact outside line at x: {impact_x:.1f}, y: {impact_y:.1f})", full_trajectory, pitch_point, impact_point
 
     # Check trajectory hitting stumps
-    for x, y in trajectory:
+    for x, y in full_trajectory:
         if abs(x - stumps_x) < stumps_width_pixels / 2 and abs(y - stumps_y) < frame_height * 0.1:
-            return f"Out (Ball hits stumps, Pitch at x: {pitch_x:.1f}, y: {pitch_y:.1f}, Impact at x: {impact_x:.1f}, y: {impact_y:.1f})", trajectory, pitch_point, impact_point
-
-    return f"Not Out (Missing stumps, Pitch at x: {pitch_x:.1f}, y: {pitch_y:.1f}, Impact at x: {impact_x:.1f}, y: {impact_y:.1f})", trajectory, pitch_point, impact_point
+            return f"Out (Ball hits stumps, Pitch at x: {pitch_x:.1f}, y: {pitch_y:.1f}, Impact at x: {impact_x:.1f}, y: {impact_y:.1f})", full_trajectory, pitch_point, impact_point
+    return f"Not Out (Missing stumps, Pitch at x: {pitch_x:.1f}, y: {pitch_y:.1f}, Impact at x: {impact_x:.1f}, y: {impact_y:.1f})", full_trajectory, pitch_point, impact_point
 
-def generate_slow_motion(frames, trajectory, pitch_point, impact_point, detection_frames, output_path):
+def generate_slow_motion(frames, vis_trajectory, pitch_point, pitch_frame, impact_point, impact_frame, detection_frames, output_path):
     if not frames:
         return None
-    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
-    out = cv2.VideoWriter(output_path, fourcc, FRAME_RATE / SLOW_MOTION_FACTOR, (frames[0].shape[1], frames[0].shape[0]))
+    frame_height, frame_width = frames[0].shape[:2]
+    stumps_x = frame_width / 2
+    stumps_y = frame_height * 0.9
+    stumps_width_pixels = frame_width * (STUMPS_WIDTH / 3.0)
+    stumps_height_pixels = frame_height * (STUMPS_HEIGHT / 3.0)
 
-    trajectory_points = np.array(trajectory[:len(detection_frames)], dtype=np.int32).reshape((-1, 1, 2))
+    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
+    out = cv2.VideoWriter(output_path, fourcc, FRAME_RATE / SLOW_MOTION_FACTOR, (frame_width, frame_height))
 
-    pitch_point_detected = False
-    impact_point_detected = False
+    # Prepare trajectory points for visualization
+    trajectory_points = np.array(vis_trajectory, dtype=np.int32).reshape((-1, 1, 2))
 
     for i, frame in enumerate(frames):
-        # Draw trajectory (blue line) only for frames with detections
+        # Draw stumps (three white vertical lines)
+        stump_positions = [
+            (stumps_x - stumps_width_pixels / 2, stumps_y),  # Left stump
+            (stumps_x, stumps_y),                           # Middle stump
+            (stumps_x + stumps_width_pixels / 2, stumps_y)   # Right stump
+        ]
+        for x, y in stump_positions:
+            cv2.line(frame, (int(x), int(y)), (int(x), int(y - stumps_height_pixels)), (255, 255, 255), 2)
+
+        # Draw trajectory (blue line) only for detected frames
         if i in detection_frames and trajectory_points.size > 0:
-            cv2.polylines(frame, [trajectory_points[:detection_frames.index(i) + 1]], False, (255, 0, 0), 2)
+            idx = detection_frames.index(i) + 1
+            if idx <= len(trajectory_points):
+                cv2.polylines(frame, [trajectory_points[:idx]], False, (255, 0, 0), 2)
 
-        # Draw pitch point (red circle with label) when the ball touches the ground
-        if pitch_point and not pitch_point_detected:
+        # Draw pitch point (red circle) only in pitch frame
+        if pitch_point and i == pitch_frame:
             x, y = pitch_point
-            if y > frame.shape[0] * 0.75:  # Adjust this threshold for the ground position
-                pitch_point_detected = True
-        if pitch_point_detected:
             cv2.circle(frame, (int(x), int(y)), 8, (0, 0, 255), -1)
             cv2.putText(frame, "Pitch Point", (int(x) + 10, int(y) - 10), 
                         cv2.FONT_HERSHEY_SIMPLEX, 0.6, (0, 0, 255), 2)
 
-        # Draw impact point (yellow circle with label) when ball is near stumps
-        if impact_point and not impact_point_detected:
+        # Draw impact point (yellow circle) only in impact frame
+        if impact_point and i == impact_frame:
             x, y = impact_point
-            if y > frame.shape[0] * 0.85:  # Adjust this threshold for impact point
-                impact_point_detected = True
-        if impact_point_detected:
             cv2.circle(frame, (int(x), int(y)), 8, (0, 255, 255), -1)
             cv2.putText(frame, "Impact Point", (int(x) + 10, int(y) + 20), 
                         cv2.FONT_HERSHEY_SIMPLEX, 0.6, (0, 255, 255), 2)
 
-        # Write frames to output video
         for _ in range(SLOW_MOTION_FACTOR):
             out.write(frame)
-
     out.release()
     return output_path
 
 def drs_review(video):
     frames, ball_positions, detection_frames, debug_log = process_video(video)
     if not frames:
-        return f"Error: Failed to process video", None
-    trajectory, pitch_point, impact_point, trajectory_log = estimate_trajectory(ball_positions, frames)
-    decision, trajectory, pitch_point, impact_point = lbw_decision(ball_positions, trajectory, frames, pitch_point, impact_point)
+        return f"Error: Failed to process video\nDebug Log:\n{debug_log}", None
+    full_trajectory, vis_trajectory, pitch_point, pitch_frame, impact_point, impact_frame, trajectory_log = estimate_trajectory(ball_positions, detection_frames, frames)
+    decision, full_trajectory, pitch_point, impact_point = lbw_decision(ball_positions, full_trajectory, frames, pitch_point, impact_point)
 
     output_path = f"output_{uuid.uuid4()}.mp4"
-    slow_motion_path = generate_slow_motion(frames, trajectory, pitch_point, impact_point, detection_frames, output_path)
+    slow_motion_path = generate_slow_motion(frames, vis_trajectory, pitch_point, pitch_frame, impact_point, impact_frame, detection_frames, output_path)
 
-    return f"DRS Decision: {decision}", slow_motion_path
+    debug_output = f"{debug_log}\n{trajectory_log}"
+    return f"DRS Decision: {decision}\nDebug Log:\n{debug_output}", slow_motion_path
 
 # Gradio interface
 iface = gr.Interface(
     fn=drs_review,
     inputs=gr.Video(label="Upload Video Clip"),
     outputs=[
-        gr.Textbox(label="DRS Decision"),
-        gr.Video(label="Slow-Motion Replay with Ball Detection (Green), Trajectory (Blue Line), Pitch Point (Red), Impact Point (Yellow)")
+        gr.Textbox(label="DRS Decision and Debug Log"),
+        gr.Video(label="Very Slow-Motion Replay with Ball Detection (Green), Trajectory (Blue Line), Pitch Point (Red), Impact Point (Yellow)")
     ],
     title="AI-Powered DRS for LBW in Local Cricket",
     description="Upload a video clip of a cricket delivery to get an LBW decision and slow-motion replay showing ball detection (green boxes), trajectory (blue line), pitch point (red circle), and impact point (yellow circle)."
 )
 
 if __name__ == "__main__":
-    iface.launch()
+    iface.launch()