app.py

import gradio as gr
import spaces
import argparse
import cv2
from PIL import Image
import numpy as np

import warnings
import torch
warnings.filterwarnings("ignore")

# Replace custom imports with Transformers
from transformers import AutoProcessor, AutoModelForZeroShotObjectDetection
# Add supervision for better visualization
import supervision as sv

# Model ID for Hugging Face
model_id = "IDEA-Research/grounding-dino-base"

# Load model and processor using Transformers
device = "cuda" if torch.cuda.is_available() else "cpu"
processor = AutoProcessor.from_pretrained(model_id)
model = AutoModelForZeroShotObjectDetection.from_pretrained(model_id).to(device)

@spaces.GPU
def run_grounding(input_image, grounding_caption, box_threshold, text_threshold):
    # Convert numpy array to PIL Image if needed
    if isinstance(input_image, np.ndarray):
        if input_image.ndim == 3:
            input_image = cv2.cvtColor(input_image, cv2.COLOR_BGR2RGB)
        input_image = Image.fromarray(input_image)

    init_image = input_image.convert("RGB")

    # Process input using transformers
    inputs = processor(images=init_image, text=grounding_caption, return_tensors="pt").to(device)

    # Run inference
    with torch.no_grad():
        outputs = model(**inputs)

    # Post-process results
    results = processor.post_process_grounded_object_detection(
        outputs,
        inputs.input_ids,
        threshold=box_threshold,
        text_threshold=text_threshold,
        target_sizes=[init_image.size[::-1]]
    )

    result = results[0]

    # Convert image for supervision visualization
    image_np = np.array(init_image)

    # Create detections for supervision
    boxes = []
    labels = []
    confidences = []
    class_ids = []

    for i, (box, score, label) in enumerate(zip(result["boxes"], result["scores"], result["labels"])):
        # box is xyxy format [xmin, ymin, xmax, ymax]
        xyxy = box.tolist()
        boxes.append(xyxy)
        labels.append(label)
        confidences.append(float(score))
        class_ids.append(i)  # Use index as class_id (integer)

    # Build the text summary in the requested format
    if boxes:
        lines = []
        for label, xyxy, conf in zip(labels, boxes, confidences):
            x1, y1, x2, y2 = [int(round(v)) for v in xyxy]
            # Format: class confidence top_left_x, top_left_y, bot_x, bot_y
            lines.append(f"{label} {conf:.3f} {x1}, {y1}, {x2}, {y2}")
        detection_text = "\n".join(lines)
    else:
        detection_text = "No detections."

    # Create Detections object for supervision & annotate
    if boxes:
        detections = sv.Detections(
            xyxy=np.array(boxes),
            confidence=np.array(confidences),
            class_id=np.array(class_ids, dtype=np.int32),
        )

        text_scale = sv.calculate_optimal_text_scale(resolution_wh=init_image.size)
        line_thickness = sv.calculate_optimal_line_thickness(resolution_wh=init_image.size)

        # Create annotators
        box_annotator = sv.BoxAnnotator(
            thickness=2,
            color=sv.ColorPalette.DEFAULT,
        )

        label_annotator = sv.LabelAnnotator(
            color=sv.ColorPalette.DEFAULT,
            text_color=sv.Color.WHITE,
            text_scale=text_scale,
            text_thickness=line_thickness,
            text_padding=3
        )

        # Create formatted labels for each detection
        formatted_labels = [
            f"{label}: {conf:.2f}"
            for label, conf in zip(labels, confidences)
        ]

        # Apply annotations to the image
        annotated_image = box_annotator.annotate(scene=image_np, detections=detections)
        annotated_image = label_annotator.annotate(
            scene=annotated_image,
            detections=detections,
            labels=formatted_labels
        )
    else:
        annotated_image = image_np

    # Convert back to PIL Image
    image_with_box = Image.fromarray(annotated_image)

    # Return both the annotated image and the detection text
    return image_with_box, detection_text

if __name__ == "__main__":

    parser = argparse.ArgumentParser("Grounding DINO demo", add_help=True)
    parser.add_argument("--debug", action="store_true", help="using debug mode")
    parser.add_argument("--share", action="store_true", help="share the app")
    args = parser.parse_args()

    css = """
  #mkd {
    height: 500px;
    overflow: auto;
    border: 1px solid #ccc;
  }
"""
    with gr.Blocks(css=css) as demo:
        gr.Markdown("<h1><center>Grounding DINO Base<h1><center>")
        gr.Markdown("<h3><center>Open-World Detection with <a href='https://github.com/IDEA-Research/GroundingDINO'>Grounding DINO</a><h3><center>")

        with gr.Row():
            with gr.Column():
                input_image = gr.Image(label="Input Image", type="pil")
                grounding_caption = gr.Textbox(
                    label="Detection Prompt (lowercase + each ends with a dot)",
                    value="a person. a car."
                )
                run_button = gr.Button("Run")

                with gr.Accordion("Advanced options", open=False):
                    box_threshold = gr.Slider(
                        minimum=0.0, maximum=1.0, value=0.3, step=0.001,
                        label="Box Threshold"
                    )
                    text_threshold = gr.Slider(
                        minimum=0.0, maximum=1.0, value=0.25, step=0.001,
                        label="Text Threshold"
                    )

            with gr.Column():
                gallery = gr.Image(
                    label="Detection Result",
                    type="pil"
                )
                det_text = gr.Textbox(
                    label="Detections (class confidence top_left_x, top_left_y, bot_x, bot_y)",
                    lines=12,
                    interactive=False,
                    show_copy_button=True
                )

        run_button.click(
            fn=run_grounding,
            inputs=[input_image, grounding_caption, box_threshold, text_threshold],
            outputs=[gallery, det_text]
        )

        gr.Examples(
            examples=[
                ["000000039769.jpg", "a cat. a remote control.", 0.3, 0.25],
                ["KakaoTalk_20250430_163200504.jpg", "cup. screen. hand.", 0.3, 0.25]
            ],
            inputs=[input_image, grounding_caption, box_threshold, text_threshold],
            outputs=[gallery, det_text],
            fn=run_grounding,
            cache_examples=True,
        )

    demo.launch(share=args.share, debug=args.debug, show_error=True)