55 lines
No EOL
1.7 KiB
Python
55 lines
No EOL
1.7 KiB
Python
# featureExtraction.py
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import cv2
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import numpy as np
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from globalVars import HEIGHT, WIDTH
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def extract_edge_features(frame):
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"""
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Extract edge features using Canny edge detection.
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Args:
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- frame (ndarray): Image frame.
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Returns:
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- ndarray: Edge feature map.
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"""
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edges = cv2.Canny(frame, threshold1=100, threshold2=200)
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return edges.astype(np.float32) / 255.0
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def extract_histogram_features(frame, bins=64):
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"""
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Extract histogram features from a frame with 3 channels.
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Args:
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- frame (ndarray): Image frame with shape (height, width, 3).
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- bins (int): Number of bins for the histogram.
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Returns:
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- ndarray: Normalized histogram feature vector.
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"""
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feature_vector = []
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for channel in range(3):
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histogram, _ = np.histogram(frame[:,:,channel].flatten(), bins=bins, range=[0, 255])
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normalized_histogram = histogram.astype(np.float32) / frame[:,:,channel].size
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feature_vector.extend(normalized_histogram)
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return np.array(feature_vector)
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def preprocess_frame(frame):
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# Check frame dimensions and resize if necessary
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if frame.shape[:2] != (HEIGHT, WIDTH):
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frame = cv2.resize(frame, (WIDTH, HEIGHT), interpolation=cv2.INTER_NEAREST)
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# Extract features
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edge_feature = extract_edge_features(frame)
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histogram_feature = extract_histogram_features(frame)
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histogram_feature_image = np.full((HEIGHT, WIDTH), histogram_feature.mean()) # Convert histogram feature to image-like shape
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combined_feature = np.stack([edge_feature, histogram_feature_image], axis=-1)
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compressed_frame = frame / 255.0 # Assuming the frame is uint8, scale to [0, 1]
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return combined_feature, compressed_frame |