app.py

import gradio as gr
import os
os.environ["TORCH_CUDNN_SDPA_ENABLED"] = "1"
import torch
import numpy as np
import cv2
import matplotlib.pyplot as plt
from PIL import Image, ImageFilter
from sam2.build_sam import build_sam2
from sam2.sam2_image_predictor import SAM2ImagePredictor

def preprocess_image(image):
    return image, gr.State([]), gr.State([]), image

def get_point(point_type, tracking_points, trackings_input_label, first_frame_path, evt: gr.SelectData):
    print(f"You selected {evt.value} at {evt.index} from {evt.target}")

    tracking_points.value.append(evt.index)
    print(f"TRACKING POINT: {tracking_points.value}")

    if point_type == "include":
        trackings_input_label.value.append(1)
    elif point_type == "exclude":
        trackings_input_label.value.append(0)
    print(f"TRACKING INPUT LABEL: {trackings_input_label.value}")
    
    # Open the image and get its dimensions
    transparent_background = Image.open(first_frame_path).convert('RGBA')
    w, h = transparent_background.size
    
    # Define the circle radius as a fraction of the smaller dimension
    fraction = 0.02  # You can adjust this value as needed
    radius = int(fraction * min(w, h))
    
    # Create a transparent layer to draw on
    transparent_layer = np.zeros((h, w, 4), dtype=np.uint8)
    
    for index, track in enumerate(tracking_points.value):
        if trackings_input_label.value[index] == 1:
            cv2.circle(transparent_layer, track, radius, (0, 255, 0, 255), -1)
        else:
            cv2.circle(transparent_layer, track, radius, (255, 0, 0, 255), -1)

    # Convert the transparent layer back to an image
    transparent_layer = Image.fromarray(transparent_layer, 'RGBA')
    selected_point_map = Image.alpha_composite(transparent_background, transparent_layer)
    
    return tracking_points, trackings_input_label, selected_point_map
    
# use bfloat16 for the entire notebook
torch.autocast(device_type="cuda", dtype=torch.bfloat16).__enter__()

if torch.cuda.get_device_properties(0).major >= 8:
    # turn on tfloat32 for Ampere GPUs (https://pytorch.org/docs/stable/notes/cuda.html#tensorfloat-32-tf32-on-ampere-devices)
    torch.backends.cuda.matmul.allow_tf32 = True
    torch.backends.cudnn.allow_tf32 = True
    
def show_mask(mask, ax, random_color=False, borders = True):
    if random_color:
        color = np.concatenate([np.random.random(3), np.array([0.6])], axis=0)
    else:
        color = np.array([30/255, 144/255, 255/255, 0.6])
    h, w = mask.shape[-2:]
    mask = mask.astype(np.uint8)
    mask_image =  mask.reshape(h, w, 1) * color.reshape(1, 1, -1)
    if borders:
        import cv2
        contours, _ = cv2.findContours(mask,cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE) 
        # Try to smooth contours
        contours = [cv2.approxPolyDP(contour, epsilon=0.01, closed=True) for contour in contours]
        mask_image = cv2.drawContours(mask_image, contours, -1, (1, 1, 1, 0.5), thickness=2) 
    ax.imshow(mask_image)

def show_points(coords, labels, ax, marker_size=375):
    pos_points = coords[labels==1]
    neg_points = coords[labels==0]
    ax.scatter(pos_points[:, 0], pos_points[:, 1], color='green', marker='*', s=marker_size, edgecolor='white', linewidth=1.25)
    ax.scatter(neg_points[:, 0], neg_points[:, 1], color='red', marker='*', s=marker_size, edgecolor='white', linewidth=1.25)   

def show_box(box, ax):
    x0, y0 = box[0], box[1]
    w, h = box[2] - box[0], box[3] - box[1]
    ax.add_patch(plt.Rectangle((x0, y0), w, h, edgecolor='green', facecolor=(0, 0, 0, 0), lw=2))    

def show_masks(image, masks, scores, point_coords=None, box_coords=None, input_labels=None, borders=True):
    combined_images = []  # List to store filenames of images with masks overlaid
    mask_images = []      # List to store filenames of separate mask images

    for i, (mask, score) in enumerate(zip(masks, scores)):
        # ---- Original Image with Mask Overlaid ----
        plt.figure(figsize=(10, 10))
        plt.imshow(image)
        show_mask(mask, plt.gca(), borders=borders)  # Draw the mask with borders
        if point_coords is not None:
            assert input_labels is not None
            show_points(point_coords, input_labels, plt.gca())
        if box_coords is not None:
            show_box(box_coords, plt.gca())
        if len(scores) > 1:
            plt.title(f"Mask {i+1}, Score: {score:.3f}", fontsize=18)
        plt.axis('off')

        # Save the figure as a JPG file
        combined_filename = f"combined_image_{i+1}.jpg"
        plt.savefig(combined_filename, format='jpg', bbox_inches='tight')
        combined_images.append(combined_filename)

        plt.close()  # Close the figure to free up memory

        # ---- Separate Mask Image (White Mask on Black Background) ----
        # Create a black image
        mask_image = np.zeros_like(image, dtype=np.uint8)
        
        # The mask is a binary array where the masked area is 1, else 0.
        # Convert the mask to a white color in the mask_image
        mask_layer = (mask > 0).astype(np.uint8) * 255
        for c in range(3):  # Assuming RGB, repeat mask for all channels
            mask_image[:, :, c] = mask_layer

        # Save the mask image
        mask_filename = f"mask_image_{i+1}.png"
        Image.fromarray(mask_image).save(mask_filename)
        mask_images.append(mask_filename)

        plt.close()  # Close the figure to free up memory

    return combined_images, mask_images

def sam_process(input_image, checkpoint, tracking_points, trackings_input_label):
    image = Image.open(input_image)
    image = np.array(image.convert("RGB"))

    if checkpoint == "tiny":
        sam2_checkpoint = "./checkpoints/sam2_hiera_tiny.pt"
        model_cfg = "sam2_hiera_t.yaml"
    elif checkpoint == "samll":
        sam2_checkpoint = "./checkpoints/sam2_hiera_small.pt"
        model_cfg = "sam2_hiera_s.yaml"
    elif checkpoint == "base-plus":
        sam2_checkpoint = "./checkpoints/sam2_hiera_base_plus.pt"
        model_cfg = "sam2_hiera_b+.yaml"
    elif checkpoint == "large":
        sam2_checkpoint = "./checkpoints/sam2_hiera_large.pt"
        model_cfg = "sam2_hiera_l.yaml"
    
    sam2_model = build_sam2(model_cfg, sam2_checkpoint, device="cuda")
    
    predictor = SAM2ImagePredictor(sam2_model)

    predictor.set_image(image)

    input_point = np.array(tracking_points.value)
    input_label = np.array(trackings_input_label.value)

    print(predictor._features["image_embed"].shape, predictor._features["image_embed"][-1].shape)

    masks, scores, logits = predictor.predict(
        point_coords=input_point,
        point_labels=input_label,
        multimask_output=False,
    )
    sorted_ind = np.argsort(scores)[::-1]
    masks = masks[sorted_ind]
    scores = scores[sorted_ind]
    logits = logits[sorted_ind]

    print(masks.shape)

    results, mask_results = show_masks(image, masks, scores, point_coords=input_point, input_labels=input_label, borders=False)
    print(results)

    return results[0], mask_results[0]

with gr.Blocks() as demo:
    first_frame_path = gr.State()
    tracking_points = gr.State([])
    trackings_input_label = gr.State([])
    with gr.Column():
        gr.Markdown("# SAM2 Image Predictor")
        gr.Markdown("This is a simple demo for image segmentation with SAM2.")
        gr.Markdown("""Instructions: 
        
        1. Upload your image 
        2. With 'include' point type selected, Click on the object to mask
        3. Switch to 'exclude' point type if you want to specify an area to avoid
        4. Submit !
        """)
        with gr.Row():
            with gr.Column():
                input_image = gr.Image(label="input image", interactive=False, type="filepath", visible=False)                 
                points_map = gr.Image(
                    label="points map", 
                    type="filepath",
                    interactive=True
                )
                with gr.Row():
                    point_type = gr.Radio(label="point type", choices=["include", "exclude"], value="include")
                    clear_points_btn = gr.Button("Clear Points")
                checkpoint = gr.Dropdown(label="Checkpoint", choices=["tiny", "small", "base-plus", "large"], value="tiny")
                submit_btn = gr.Button("Submit")
            with gr.Column():
                output_result = gr.Image()
                output_result_mask = gr.Image()
    
    clear_points_btn.click(
        fn = preprocess_image,
        inputs = input_image, 
        outputs = [first_frame_path, tracking_points, trackings_input_label, points_map],
        queue=False
    )
    
    points_map.upload(
        preprocess_image, 
        points_map, 
        [first_frame_path, tracking_points, trackings_input_label, input_image],
        queue=False
    )

    points_map.select(
        get_point, 
        [point_type, tracking_points, trackings_input_label, first_frame_path], 
        [tracking_points, trackings_input_label, points_map], 
        queue=False
    )


    submit_btn.click(
        fn = sam_process,
        inputs = [input_image, checkpoint, tracking_points, trackings_input_label],
        outputs = [output_result, output_result_mask]
    )
demo.launch()