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import cv2 |
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import torch |
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import numpy as np |
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import torch.nn.functional as F |
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from torch import nn |
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from transformers import AutoImageProcessor, Swinv2ForImageClassification, SegformerForSemanticSegmentation |
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import matplotlib.pyplot as plt |
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import streamlit as st |
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from PIL import Image |
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import io |
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class GlaucomaModel(object): |
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def __init__(self, |
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cls_model_path="pamixsun/swinv2_tiny_for_glaucoma_classification", |
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seg_model_path='pamixsun/segformer_for_optic_disc_cup_segmentation', |
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device=torch.device('cpu')): |
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self.device = device |
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self.cls_extractor = AutoImageProcessor.from_pretrained(cls_model_path) |
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self.cls_model = Swinv2ForImageClassification.from_pretrained(cls_model_path).to(device).eval() |
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self.seg_extractor = AutoImageProcessor.from_pretrained(seg_model_path) |
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self.seg_model = SegformerForSemanticSegmentation.from_pretrained(seg_model_path).to(device).eval() |
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self.cls_id2label = self.cls_model.config.id2label |
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self.seg_id2label = self.seg_model.config.id2label |
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def glaucoma_pred(self, image): |
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inputs = self.cls_extractor(images=image.copy(), return_tensors="pt") |
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with torch.no_grad(): |
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inputs.to(self.device) |
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outputs = self.cls_model(**inputs).logits |
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probs = F.softmax(outputs, dim=-1) |
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disease_idx = probs.cpu()[0, :].numpy().argmax() |
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confidence = probs.cpu()[0, disease_idx].item() * 100 |
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return disease_idx, confidence |
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def optic_disc_cup_pred(self, image): |
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inputs = self.seg_extractor(images=image.copy(), return_tensors="pt") |
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with torch.no_grad(): |
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inputs.to(self.device) |
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outputs = self.seg_model(**inputs) |
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logits = outputs.logits.cpu() |
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upsampled_logits = nn.functional.interpolate( |
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logits, size=image.shape[:2], mode="bilinear", align_corners=False |
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) |
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seg_probs = F.softmax(upsampled_logits, dim=1) |
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pred_disc_cup = upsampled_logits.argmax(dim=1)[0] |
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cup_confidence = seg_probs[0, 2, :, :].mean().item() * 100 |
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disc_confidence = seg_probs[0, 1, :, :].mean().item() * 100 |
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return pred_disc_cup.numpy().astype(np.uint8), cup_confidence, disc_confidence |
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def process(self, image): |
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image_shape = image.shape[:2] |
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disease_idx, cls_confidence = self.glaucoma_pred(image) |
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disc_cup, cup_confidence, disc_confidence = self.optic_disc_cup_pred(image) |
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try: |
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vcdr = simple_vcdr(disc_cup) |
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except: |
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vcdr = np.nan |
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mask = (disc_cup > 0).astype(np.uint8) |
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x, y, w, h = cv2.boundingRect(mask) |
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padding = max(50, int(0.2 * max(w, h))) |
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x = max(x - padding, 0) |
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y = max(y - padding, 0) |
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w = min(w + 2 * padding, image.shape[1] - x) |
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h = min(h + 2 * padding, image.shape[0] - y) |
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cropped_image = image[y:y+h, x:x+w] if w >= 50 and h >= 50 else image.copy() |
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_, disc_cup_image = add_mask(image, disc_cup, [1, 2], [[0, 255, 0], [255, 0, 0]], 0.2) |
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return disease_idx, disc_cup_image, vcdr, cls_confidence, cup_confidence, disc_confidence, cropped_image |
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def simple_vcdr(mask): |
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""" |
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Simple function to calculate the vertical cup-to-disc ratio (VCDR). |
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Assumes: |
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- mask contains class 1 for optic disc and class 2 for optic cup. |
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""" |
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disc_area = np.sum(mask == 1) |
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cup_area = np.sum(mask == 2) |
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if disc_area == 0: |
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return np.nan |
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vcdr = cup_area / disc_area |
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return vcdr |
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def add_mask(image, mask, classes, colors, alpha=0.5): |
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""" |
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Adds a transparent mask to the original image. |
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Args: |
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- image: the original RGB image |
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- mask: the predicted segmentation mask |
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- classes: a list of class indices to apply masks for (e.g., [1, 2]) |
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- colors: a list of colors for each class (e.g., [[0, 255, 0], [255, 0, 0]] for green and red) |
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- alpha: transparency level (default = 0.5) |
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""" |
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overlay = image.copy() |
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for class_id, color in zip(classes, colors): |
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overlay[mask == class_id] = color |
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output = cv2.addWeighted(overlay, alpha, image, 1 - alpha, 0) |
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return output, overlay |
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def main(): |
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st.set_page_config(layout="wide") |
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st.title("Glaucoma Screening from Retinal Fundus Images") |
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st.write('Developed by X. Sun. Find more info about me: https://pamixsun.github.io') |
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cols = st.beta_columns((1, 1, 1, 1)) |
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cols[0].subheader("Input image") |
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cols[1].subheader("Optic disc and optic cup") |
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cols[2].subheader("Class activation map") |
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cols[3].subheader("Cropped Image") |
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st.sidebar.title("Image selection") |
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st.set_option('deprecation.showfileUploaderEncoding', False) |
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uploaded_file = st.sidebar.file_uploader("Upload image", type=['png', 'jpeg', 'jpg']) |
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if uploaded_file is not None: |
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image = Image.open(uploaded_file).convert('RGB') |
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image = np.array(image).astype(np.uint8) |
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fig, ax = plt.subplots() |
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ax.imshow(image) |
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ax.axis('off') |
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cols[0].pyplot(fig) |
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if st.sidebar.button("Analyze image"): |
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if uploaded_file is None: |
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st.sidebar.write("Please upload an image") |
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else: |
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with st.spinner('Loading model...'): |
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run_device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu") |
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model = GlaucomaModel(device=run_device) |
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with st.spinner('Analyzing...'): |
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disease_idx, disc_cup_image, vcdr, cls_confidence, cup_confidence, disc_confidence, cropped_image = model.process(image) |
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ax.imshow(disc_cup_image) |
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ax.axis('off') |
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cols[1].pyplot(fig) |
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ax.imshow(image) |
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ax.axis('off') |
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cols[2].pyplot(fig) |
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ax.imshow(cropped_image) |
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ax.axis('off') |
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cols[3].pyplot(fig) |
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buf = io.BytesIO() |
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Image.fromarray(cropped_image).save(buf, format="PNG") |
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st.sidebar.download_button( |
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label="Download Cropped Image", |
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data=buf.getvalue(), |
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file_name="cropped_image.png", |
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mime="image/png" |
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) |
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st.subheader("Screening results:") |
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final_results_as_table = f""" |
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|Parameters|Outcomes| |
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|---|---| |
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|Vertical cup-to-disc ratio|{vcdr:.04f}| |
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|Category|{model.cls_id2label[disease_idx]} ({cls_confidence:.02f}% confidence)| |
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|Optic Cup Segmentation Confidence|{cup_confidence:.02f}%| |
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|Optic Disc Segmentation Confidence|{disc_confidence:.02f}%| |
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""" |
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st.markdown(final_results_as_table) |
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if __name__ == '__main__': |
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main() |