app.py

import gradio as gr
from roboflow import Roboflow
import tempfile
import os
from sahi.slicing import slice_image
import numpy as np
import cv2
from PIL import Image, ImageDraw

# Initialize Roboflow
rf = Roboflow(api_key="Otg64Ra6wNOgDyjuhMYU")
project = rf.workspace("alat-pelindung-diri").project("nescafe-4base")
model = project.version(16).model

# Apply NMS (Non-Maximum Suppression)
def apply_nms(predictions, iou_threshold=0.5):
    boxes = []
    scores = []
    classes = []

    # Extract boxes, scores, and class info
    for prediction in predictions:
        boxes.append(prediction['bbox'])
        scores.append(prediction['confidence'])
        classes.append(prediction['class'])

    boxes = np.array(boxes)
    scores = np.array(scores)
    classes = np.array(classes)

    # Perform NMS using OpenCV
    indices = cv2.dnn.NMSBoxes(boxes.tolist(), scores.tolist(), score_threshold=0.25, nms_threshold=iou_threshold)

    print(f"Predictions before NMS: {predictions}")
    print(f"Indices after NMS: {indices}")

    # Check if indices is empty or invalid
    if not indices or not isinstance(indices, tuple) or len(indices) == 0:
        print("No valid indices returned from NMS.")
        return []  # Return an empty list if no valid indices are found

    # Extract the indices if they are valid
    indices = indices[0]  # Extracting the first element which contains the indices

    # Flatten indices array (if returned as a tuple)
    indices = indices.flatten() if isinstance(indices, np.ndarray) else np.array(indices).flatten()

    nms_predictions = []

    for i in indices:
        nms_predictions.append({
            'class': classes[i],
            'bbox': boxes[i],
            'confidence': scores[i]
        })

    return nms_predictions

# Detect objects and annotate the image
def detect_objects(image):
    # Save the image temporarily
    with tempfile.NamedTemporaryFile(delete=False, suffix=".jpg") as temp_file:
        image.save(temp_file, format="JPEG")
        temp_file_path = temp_file.name

    # Slice the image into smaller pieces
    slice_image_result = slice_image(
        image=temp_file_path,
        output_file_name="sliced_image",
        output_dir="/tmp/sliced/",
        slice_height=256,
        slice_width=256,
        overlap_height_ratio=0.1,
        overlap_width_ratio=0.1
    )

    # Print to check the available attributes of the slice_image_result object
    print(f"Slice result: {slice_image_result}")

    # Try accessing the sliced image paths from the result object
    try:
        sliced_image_paths = slice_image_result.sliced_image_paths  # Assuming this is the correct attribute
        print(f"Sliced image paths: {sliced_image_paths}")
    except AttributeError:
        print("Failed to access sliced_image_paths attribute.")
        sliced_image_paths = []

    # Save all predictions for each sliced image
    all_predictions = []

    # Predict on each sliced image
    for sliced_image_path in sliced_image_paths:
        if isinstance(sliced_image_path, str):
            predictions = model.predict(image_path=sliced_image_path).json()
            all_predictions.extend(predictions['predictions'])
        else:
            print(f"Skipping invalid image path: {sliced_image_path}")
    
    # Apply NMS to remove duplicate detections
    postprocessed_predictions = apply_nms(all_predictions, iou_threshold=0.5)

    # Annotate the image with prediction results using OpenCV
    img = cv2.imread(temp_file_path)
    for prediction in postprocessed_predictions:
        class_name = prediction['class']
        bbox = prediction['bbox']
        confidence = prediction['confidence']
        
        # Unpack the bounding box coordinates
        x, y, w, h = map(int, bbox)

        # Draw the bounding box and label on the image
        color = (0, 255, 0)  # Green color for the box
        thickness = 2
        cv2.rectangle(img, (x, y), (x + w, y + h), color, thickness)

        label = f"{class_name}: {confidence:.2f}"
        cv2.putText(img, label, (x, y - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.5, color, thickness)

    # Convert the image from BGR to RGB for PIL compatibility
    img_rgb = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
    annotated_image = Image.fromarray(img_rgb)

    # Save the annotated image
    output_image_path = "/tmp/prediction.jpg"
    annotated_image.save(output_image_path)

    # Count objects per class
    class_count = {}
    for detection in postprocessed_predictions:
        class_name = detection['class']
        if class_name in class_count:
            class_count[class_name] += 1
        else:
            class_count[class_name] = 1

    # Object count result
    result_text = "Jumlah objek per kelas:\n"
    for class_name, count in class_count.items():
        result_text += f"{class_name}: {count} objek\n"

    # Remove temporary file
    os.remove(temp_file_path)

    return output_image_path, result_text

# Gradio interface
iface = gr.Interface(
    fn=detect_objects,                         # Function called when image is uploaded
    inputs=gr.Image(type="pil"),               # Input is an image
    outputs=[gr.Image(), gr.Textbox()],        # Output is an image and text
    live=True                                    # Display results live
)

# Run the interface
iface.launch()