app.py

import gradio as gr
import cv2
import numpy as np
from ultralytics import YOLO
import torch
import os

def create_gradient_circle(radius, color=(0, 255, 0), alpha=0.7):
    """Create a gradient circle with a glowing effect"""
    size = radius * 2 + 1
    center = (radius, radius)
    circle_img = np.zeros((size, size, 4), dtype=np.uint8)
    
    for r in range(radius + 1):
        alpha_r = alpha * (1 - (r/radius)**2)
        cv2.circle(circle_img, center, r, (*color, int(255 * alpha_r)), -1)
    
    return circle_img

def draw_advanced_keypoint(frame, center, keypoint_id, conf, radius=12):
    """Draw an advanced technical keypoint with class ID"""
    x, y = center
    color = (0, 255, 0)
    
    gradient = create_gradient_circle(radius + 4, color)
    
    gx1, gy1 = max(0, x-radius-4), max(0, y-radius-4)
    gx2, gy2 = min(frame.shape[1], x+radius+5), min(frame.shape[0], y+radius+5)
    
    if gx1 < gx2 and gy1 < gy2:
        roi = frame[gy1:gy2, gx1:gx2]
        gradient_roi = gradient[:gy2-gy1, :gx2-gx1]
        alpha = gradient_roi[:, :, 3:4] / 255.0
        roi[:] = roi * (1 - alpha) + gradient_roi[:, :, :3] * alpha
    
    cv2.circle(frame, center, radius, color, 2)
    cv2.circle(frame, center, radius-2, color, -1)
    cv2.circle(frame, center, radius-1, (255, 255, 255), 1)
    
    label_text = f"{keypoint_id}:{conf:.2f}"
    font = cv2.FONT_HERSHEY_SIMPLEX
    font_scale = 1.0
    thickness = 2
    
    (text_w, text_h), baseline = cv2.getTextSize(label_text, font, font_scale, thickness)
    
    margin = 2
    bg_pts = np.array([
        [x - text_w//2 - margin, y - radius - text_h - margin*2],
        [x + text_w//2 + margin, y - radius - text_h - margin*2],
        [x + text_w//2 + margin, y - radius - margin],
        [x + margin, y - radius + margin],
        [x - margin, y - radius + margin],
        [x - text_w//2 - margin, y - radius - margin],
    ], np.int32)
    
    cv2.fillPoly(frame, [bg_pts], (0, 0, 0))
    cv2.polylines(frame, [bg_pts], True, color, 1)
    
    cv2.putText(frame, label_text,
                (x - text_w//2, y - radius - margin*2),
                font, font_scale, (255, 255, 255), thickness)

def process_image(input_image, conf_threshold=0.5):
    """Process image for pose estimation"""
    # Load model
    model_path = "HockeyRink.pt"
    model = YOLO(model_path)
    
    # Convert Gradio image to CV2 format if necessary
    if isinstance(input_image, str):
        frame = cv2.imread(input_image)
    else:
        frame = cv2.cvtColor(input_image, cv2.COLOR_RGB2BGR)
    
    # Make prediction
    results = model.predict(frame, conf=conf_threshold)
    
    # Create copy for annotation
    annotated_frame = frame.copy()
    
    # Process each detection
    for result in results:
        if result.keypoints is not None:
            keypoints = result.keypoints.data[0]
            
            # Draw class label
            if hasattr(result, 'boxes') and len(result.boxes.cls) > 0:
                class_id = int(result.boxes.cls[0])
                class_conf = float(result.boxes.conf[0])
                
                if len(keypoints) > 0:
                    text_x = int(min(kp[0] for kp in keypoints))
                    text_y = int(min(kp[1] for kp in keypoints)) - 40
                    
                    main_label = f"Class ID:{class_id} ({class_conf:.2f})"
                    font = cv2.FONT_HERSHEY_SIMPLEX
                    font_scale = 1.2
                    thickness = 2
                    
                    (text_w, text_h), baseline = cv2.getTextSize(main_label, font, font_scale, thickness)
                    
                    cv2.rectangle(annotated_frame,
                                (text_x - 5, text_y - text_h - 5),
                                (text_x + text_w + 5, text_y + 5),
                                (0, 0, 0), -1)
                    
                    cv2.putText(annotated_frame, main_label,
                              (text_x, text_y),
                              font, font_scale,
                              (255, 255, 255), thickness)
            
            # Draw keypoints
            for idx, kp in enumerate(keypoints):
                x, y, conf = int(kp[0]), int(kp[1]), kp[2]
                if conf > conf_threshold:
                    draw_advanced_keypoint(
                        annotated_frame,
                        (x, y),
                        idx,
                        conf
                    )
    
    # Convert back to RGB for Gradio
    return cv2.cvtColor(annotated_frame, cv2.COLOR_BGR2RGB)

# Create Gradio interface
def create_interface():
    examples = [
        ["exm_1.jpg"],
        ["exm_2.jpg"],
        ["exm_3.jpg"],
        ["exm_4.jpg"],
    ]
    
    iface = gr.Interface(
        fn=process_image,
        inputs=[
            gr.Image(type="numpy", label="Input Image"),
        ],
        outputs=gr.Image(type="numpy", label="Detected Poses"),
        title="HockeyRink: A Model for Precise Ice Hockey Rink Keypoint Mapping and Analytics",
        description="Upload an image of ice hockey to detect keypoints on the rink.",
        examples=examples,
        theme=gr.themes.Base()
    )
    return iface

if __name__ == "__main__":
    iface = create_interface()
    iface.launch()