Create app.py

app.py

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+import streamlit as st
+import cv2
+import numpy as np
+import onnxruntime as ort
+from PIL import Image
+import tempfile
+
+# Load the ONNX model
+@st.cache_resource
+def load_model():
+    return ort.InferenceSession("model.onnx")
+
+ort_session = load_model()
+
+def preprocess_image(image, target_size=(640, 640)):
+    # Resize image
+    image = cv2.resize(image, target_size)
+    # Normalize
+    image = image.astype(np.float32) / 255.0
+    # Transpose for ONNX input
+    image = np.transpose(image, (2, 0, 1))
+    # Add batch dimension
+    image = np.expand_dims(image, axis=0)
+    return image
+
+def postprocess_results(output, image_shape, confidence_threshold=0.25, iou_threshold=0.45):
+    # Assuming YOLO v5 output format
+    boxes = output[0]
+    scores = output[1]
+    class_ids = output[2]
+
+    # Filter by confidence
+    mask = scores > confidence_threshold
+    boxes = boxes[mask]
+    scores = scores[mask]
+    class_ids = class_ids[mask]
+
+    # Apply NMS
+    indices = cv2.dnn.NMSBoxes(boxes.tolist(), scores.tolist(), confidence_threshold, iou_threshold)
+
+    results = []
+    for i in indices:
+        box = boxes[i]
+        score = scores[i]
+        class_id = class_ids[i]
+        x, y, w, h = box
+        x1 = int(x * image_shape[1])
+        y1 = int(y * image_shape[0])
+        x2 = int((x + w) * image_shape[1])
+        y2 = int((y + h) * image_shape[0])
+        results.append((x1, y1, x2, y2, score, class_id))
+
+    return results
+
+def process_image(image):
+    orig_image = image.copy()
+    processed_image = preprocess_image(image)
+    
+    # Run inference
+    inputs = {ort_session.get_inputs()[0].name: processed_image}
+    outputs = ort_session.run(None, inputs)
+    
+    results = postprocess_results(outputs, image.shape)
+    
+    # Draw bounding boxes on the image
+    for x1, y1, x2, y2, score, class_id in results:
+        cv2.rectangle(orig_image, (x1, y1), (x2, y2), (0, 255, 0), 2)
+        label = f"License Plate: {score:.2f}"
+        cv2.putText(orig_image, label, (x1, y1 - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.9, (0, 255, 0), 2)
+    
+    return orig_image
+
+def process_video(video_path):
+    cap = cv2.VideoCapture(video_path)
+    
+    # Get video properties
+    width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
+    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
+    fps = int(cap.get(cv2.CAP_PROP_FPS))
+    
+    # Create a temporary file to store the processed video
+    temp_file = tempfile.NamedTemporaryFile(delete=False, suffix='.mp4')
+    out = cv2.VideoWriter(temp_file.name, cv2.VideoWriter_fourcc(*'mp4v'), fps, (width, height))
+    
+    while cap.isOpened():
+        ret, frame = cap.read()
+        if not ret:
+            break
+        
+        processed_frame = process_image(frame)
+        out.write(processed_frame)
+    
+    cap.release()
+    out.release()
+    
+    return temp_file.name
+
+st.title("License Plate Detection")
+
+uploaded_file = st.file_uploader("Choose an image or video file", type=["jpg", "jpeg", "png", "mp4"])
+
+if uploaded_file is not None:
+    file_type = uploaded_file.type.split('/')[0]
+    
+    if file_type == "image":
+        image = Image.open(uploaded_file)
+        image = np.array(image)
+        
+        st.image(image, caption="Uploaded Image", use_column_width=True)
+        
+        if st.button("Detect License Plates"):
+            processed_image = process_image(image)
+            st.image(processed_image, caption="Processed Image", use_column_width=True)
+    
+    elif file_type == "video":
+        tfile = tempfile.NamedTemporaryFile(delete=False)
+        tfile.write(uploaded_file.read())
+        
+        st.video(tfile.name)
+        
+        if st.button("Detect License Plates"):
+            processed_video = process_video(tfile.name)
+            st.video(processed_video)
+
+st.write("Upload an image or video to detect license plates.")