app.py

import gradio as gr
import cv2
import numpy as np
import torch
from torchvision import models, transforms
from torchvision.models.detection import FasterRCNN_ResNet50_FPN_Weights
from PIL import Image
import mediapipe as mp
from fer import FER  # Facial emotion recognition
from concurrent.futures import ThreadPoolExecutor

# -----------------------------
# Global Asynchronous Executor & Caches
# -----------------------------
executor = ThreadPoolExecutor(max_workers=4)
latest_results = {
    "posture": None,
    "emotion": None,
    "objects": None,
    "faces": None
}
futures = {
    "posture": None,
    "emotion": None,
    "objects": None,
    "faces": None
}

def async_analyze(key, func, image):
    """
    Runs the heavy detection function 'func' in a background thread.
    Returns the last computed result (if available) so that the output
    FPS remains high even if the detection lags.
    """
    if futures[key] is None or futures[key].done():
        futures[key] = executor.submit(func, image)
    if futures[key].done():
        latest_results[key] = futures[key].result()
    # Return latest result if available; otherwise, compute synchronously
    return latest_results.get(key, func(image))

# -----------------------------
# Initialize Models and Helpers
# -----------------------------

# MediaPipe Pose for posture analysis
mp_pose = mp.solutions.pose
pose = mp_pose.Pose()
mp_drawing = mp.solutions.drawing_utils

# MediaPipe Face Detection for face detection
mp_face_detection = mp.solutions.face_detection
face_detection = mp_face_detection.FaceDetection(min_detection_confidence=0.5)

# Object Detection Model: Faster R-CNN (pretrained on COCO)
object_detection_model = models.detection.fasterrcnn_resnet50_fpn(
    weights=FasterRCNN_ResNet50_FPN_Weights.DEFAULT
)
object_detection_model.eval()
obj_transform = transforms.Compose([transforms.ToTensor()])

# Facial Emotion Detection using FER (requires TensorFlow)
emotion_detector = FER(mtcnn=True)

# -----------------------------
# Heavy (Synchronous) Analysis Functions
# -----------------------------

def _analyze_posture(image):
    # Convert from PIL (RGB) to OpenCV BGR format
    frame = cv2.cvtColor(np.array(image), cv2.COLOR_RGB2BGR)
    output_frame = frame.copy()
    frame_rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    posture_result = "No posture detected"
    pose_results = pose.process(frame_rgb)
    if pose_results.pose_landmarks:
        posture_result = "Posture detected"
        mp_drawing.draw_landmarks(
            output_frame, pose_results.pose_landmarks, mp_pose.POSE_CONNECTIONS,
            mp_drawing.DrawingSpec(color=(0, 255, 0), thickness=2, circle_radius=2),
            mp_drawing.DrawingSpec(color=(0, 0, 255), thickness=2)
        )
    annotated_image = cv2.cvtColor(output_frame, cv2.COLOR_BGR2RGB)
    return annotated_image, f"Posture Analysis: {posture_result}"

def _analyze_emotion(image):
    frame = cv2.cvtColor(np.array(image), cv2.COLOR_RGB2BGR)
    frame_rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    emotions = emotion_detector.detect_emotions(frame_rgb)
    if emotions:
        top_emotion, score = max(emotions[0]["emotions"].items(), key=lambda x: x[1])
        emotion_text = f"{top_emotion} ({score:.2f})"
    else:
        emotion_text = "No face detected for emotion analysis"
    annotated_image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    return annotated_image, f"Emotion Analysis: {emotion_text}"

def _analyze_objects(image):
    frame = cv2.cvtColor(np.array(image), cv2.COLOR_RGB2BGR)
    output_frame = frame.copy()
    frame_rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    image_pil = Image.fromarray(frame_rgb)
    img_tensor = obj_transform(image_pil)
    with torch.no_grad():
        detections = object_detection_model([img_tensor])[0]
    threshold = 0.8
    detected_boxes = detections["boxes"][detections["scores"] > threshold]
    for box in detected_boxes:
        box = box.int().cpu().numpy()
        cv2.rectangle(output_frame, (box[0], box[1]), (box[2], box[3]), (255, 255, 0), 2)
    object_result = f"Detected {len(detected_boxes)} object(s)" if len(detected_boxes) else "No objects detected"
    annotated_image = cv2.cvtColor(output_frame, cv2.COLOR_BGR2RGB)
    return annotated_image, f"Object Detection: {object_result}"

def _analyze_faces(image):
    frame = cv2.cvtColor(np.array(image), cv2.COLOR_RGB2BGR)
    output_frame = frame.copy()
    frame_rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    face_results = face_detection.process(frame_rgb)
    face_result = "No faces detected"
    if face_results.detections:
        face_result = f"Detected {len(face_results.detections)} face(s)"
        h, w, _ = output_frame.shape
        for detection in face_results.detections:
            bbox = detection.location_data.relative_bounding_box
            x = int(bbox.xmin * w)
            y = int(bbox.ymin * h)
            box_w = int(bbox.width * w)
            box_h = int(bbox.height * h)
            cv2.rectangle(output_frame, (x, y), (x + box_w, y + box_h), (0, 0, 255), 2)
    annotated_image = cv2.cvtColor(output_frame, cv2.COLOR_BGR2RGB)
    return annotated_image, f"Face Detection: {face_result}"

# -----------------------------
# Asynchronous (Fast) Analysis Functions
# -----------------------------
def analyze_posture(image):
    return async_analyze("posture", _analyze_posture, image)

def analyze_emotion(image):
    return async_analyze("emotion", _analyze_emotion, image)

def analyze_objects(image):
    return async_analyze("objects", _analyze_objects, image)

def analyze_faces(image):
    return async_analyze("faces", _analyze_faces, image)

# -----------------------------
# Custom CSS for a High-Tech Look (White Font)
# -----------------------------
custom_css = """
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700&display=swap');
body {
    background-color: #0e0e0e;
    color: #ffffff;
    font-family: 'Orbitron', sans-serif;
    margin: 0;
    padding: 0;
}
.gradio-container {
    background: linear-gradient(135deg, #1e1e2f, #3e3e55);
    border-radius: 10px;
    padding: 20px;
    max-width: 1200px;
    margin: auto;
}
.gradio-title {
    font-size: 2.5em;
    color: #ffffff;
    text-align: center;
    margin-bottom: 0.2em;
}
.gradio-description {
    font-size: 1.2em;
    text-align: center;
    margin-bottom: 1em;
    color: #ffffff;
}
"""

# -----------------------------
# Create Individual Interfaces for Each Analysis
# -----------------------------
posture_interface = gr.Interface(
    fn=analyze_posture,
    inputs=gr.Image(sources=["webcam"], streaming=True, label="Capture Your Posture"),
    outputs=[gr.Image(type="numpy", label="Annotated Output"), gr.Textbox(label="Posture Analysis")],
    title="Posture Analysis",
    description="Detects your posture using MediaPipe.",
    live=True
)

emotion_interface = gr.Interface(
    fn=analyze_emotion,
    inputs=gr.Image(sources=["webcam"], streaming=True, label="Capture Your Face"),
    outputs=[gr.Image(type="numpy", label="Annotated Output"), gr.Textbox(label="Emotion Analysis")],
    title="Emotion Analysis",
    description="Detects facial emotions using FER.",
    live=True
)

objects_interface = gr.Interface(
    fn=analyze_objects,
    inputs=gr.Image(sources=["webcam"], streaming=True, label="Capture the Scene"),
    outputs=[gr.Image(type="numpy", label="Annotated Output"), gr.Textbox(label="Object Detection")],
    title="Object Detection",
    description="Detects objects using a pretrained Faster R-CNN.",
    live=True
)

faces_interface = gr.Interface(
    fn=analyze_faces,
    inputs=gr.Image(sources=["webcam"], streaming=True, label="Capture Your Face"),
    outputs=[gr.Image(type="numpy", label="Annotated Output"), gr.Textbox(label="Face Detection")],
    title="Face Detection",
    description="Detects faces using MediaPipe.",
    live=True
)

# -----------------------------
# Create a Tabbed Interface for All Analyses
# -----------------------------
tabbed_interface = gr.TabbedInterface(
    interface_list=[posture_interface, emotion_interface, objects_interface, faces_interface],
    tab_names=["Posture", "Emotion", "Objects", "Faces"]
)

# -----------------------------
# Wrap Everything in a Blocks Layout with Custom CSS
# -----------------------------
demo = gr.Blocks(css=custom_css)
with demo:
    gr.Markdown("<h1 class='gradio-title'>Real-Time Multi-Analysis App</h1>")
    gr.Markdown("<p class='gradio-description'>Experience a high-tech cinematic interface for real-time analysis of your posture, emotions, objects, and faces using your webcam.</p>")
    tabbed_interface.render()

if __name__ == "__main__":
    demo.launch()