init

find_v3.py

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+import cv2
+import numpy as np
+import joblib
+from skimage.feature import hog
+import imutils
+from imutils.object_detection import non_max_suppression
+from skimage.transform import pyramid_gaussian
+import asyncio
+import concurrent.futures
+
+def sliding_window(image, stepSize, windowSize):
+    # Standard (synchronous) sliding window generator (not used in async version)
+    for y in range(0, image.shape[0] - windowSize[1] + 1, stepSize):
+        for x in range(0, image.shape[1] - windowSize[0] + 1, stepSize):
+            yield (x, y, image[y:y + windowSize[1], x:x + windowSize[0]])
+
+# Helper function: generate sliding windows for a given y-range
+def generate_windows_for_y_range(image, stepSize, windowSize, y_start, y_end):
+    windows = []
+    # Ensure y_end does not exceed allowed range
+    for y in range(y_start, min(y_end, image.shape[0] - windowSize[1] + 1), stepSize):
+        for x in range(0, image.shape[1] - windowSize[0] + 1, stepSize):
+            window = image[y:y + windowSize[1], x:x + windowSize[0]]
+            # Only add if the window has the desired size
+            if window.shape[0] == windowSize[1] and window.shape[1] == windowSize[0]:
+                windows.append((x, y, window))
+    return windows
+
+# Asynchronous sliding window generator using 5 workers
+async def async_sliding_window(image, stepSize, windowSize, num_workers=5):
+    loop = asyncio.get_running_loop()
+    height = image.shape[0] - windowSize[1] + 1
+    segment_size = max(1, height // num_workers)
+    tasks = []
+    with concurrent.futures.ThreadPoolExecutor(max_workers=num_workers) as executor:
+        for i in range(0, height, segment_size):
+            y_start = i
+            y_end = i + segment_size
+            tasks.append(loop.run_in_executor(
+                executor,
+                generate_windows_for_y_range,
+                image, stepSize, windowSize, y_start, y_end
+            ))
+        results = await asyncio.gather(*tasks)
+    # Flatten the list of lists into a single list of windows
+    windows = [win for sublist in results for win in sublist]
+    return windows
+
+# HOG parameters (must match training parameters)
+hog_params = {
+    'orientations': 9,
+    'pixels_per_cell': (8, 8),
+    'cells_per_block': (2, 2),
+    'block_norm': 'L2-Hys'
+}
+
+# Detection parameters
+windowSize = (64, 64)
+hogSize = (128, 128)  # Size to which each window is resized for HOG extraction.
+stepSize = 8          # Sliding window step size.
+scale_factor = 1.1    # Pyramid downscale factor.
+detection_threshold = 0.9  # Minimum probability to consider a detection valid.
+
+# Load the pre-trained model
+model = joblib.load('svm_natural_images_model.pkl')
+if hasattr(model, 'best_estimator_'):
+    model = model.best_estimator_
+
+# Initializer for each worker process
+def init_worker(_model, _hog_params, _hogSize, _detection_threshold, _windowSize):
+    global model, hog_params, hogSize, detection_threshold, windowSize
+    model = _model
+    hog_params = _hog_params
+    hogSize = _hogSize
+    detection_threshold = _detection_threshold
+    windowSize = _windowSize
+
+# Process a single window: extract features and run prediction
+def process_window(args):
+    window, x, y, scale_ratio = args
+    if window.dtype != np.uint8:
+        window = (window * 255).astype(np.uint8)
+    # Convert to grayscale and resize for HOG
+    gray = cv2.cvtColor(window, cv2.COLOR_BGR2GRAY)
+    gray = cv2.resize(gray, hogSize)
+    features = hog(gray, **hog_params)
+    features = features.reshape(1, -1)
+    pred = model.predict(features)
+    prob = model.predict_proba(features)[0]
+    if 'person' in model.classes_:
+        person_index = list(model.classes_).index('person')
+        person_prob = prob[person_index]
+    else:
+        person_prob = 0
+    if pred[0] == 'person' and person_prob > detection_threshold:
+        startX = int(x * scale_ratio)
+        startY = int(y * scale_ratio)
+        endX = int((x + windowSize[0]) * scale_ratio)
+        endY = int((y + windowSize[1]) * scale_ratio)
+        return (startX, startY, endX, endY)
+    return None
+
+# Main asynchronous detection function
+async def async_detection(image):
+    detections = []
+    loop = asyncio.get_running_loop()
+    tasks = []
+    # ProcessPoolExecutor for heavy computation (up to 10 processes)
+    with concurrent.futures.ProcessPoolExecutor(
+            max_workers=10,
+            initializer=init_worker,
+            initargs=(model, hog_params, hogSize, detection_threshold, windowSize)
+        ) as process_executor:
+        # Iterate over each level in the image pyramid
+        for resized in pyramid_gaussian(image, downscale=scale_factor, channel_axis=-1):
+            scale_ratio = image.shape[1] / float(resized.shape[1])
+            # Asynchronously generate sliding