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import cv2 | |
import numpy as np | |
def watershed_segmentation(input_image): | |
# Convert the image to grayscale | |
gray = cv2.cvtColor(input_image, cv2.COLOR_BGR2GRAY) | |
# Apply adaptive thresholding | |
thresh = cv2.adaptiveThreshold(gray, 255, cv2.ADAPTIVE_THRESH_MEAN_C, cv2.THRESH_BINARY_INV, 11, 2) | |
# Morphological operations to remove small noise - use morphologyEx | |
kernel = np.ones((3, 3), np.uint8) | |
opening = cv2.morphologyEx(thresh, cv2.MORPH_OPEN, kernel, iterations=2) | |
# Identify sure background area | |
sure_bg = cv2.dilate(opening, kernel, iterations=3) | |
# Find sure foreground area using distance transform | |
dist_transform = cv2.distanceTransform(opening, cv2.DIST_L2, 5) | |
ret, sure_fg = cv2.threshold(dist_transform, 0.7 * dist_transform.max(), 255, 0) | |
# Find unknown region | |
sure_fg = np.uint8(sure_fg) | |
unknown = cv2.subtract(sure_bg, sure_fg) | |
# Marker labeling | |
ret, markers = cv2.connectedComponents(sure_fg) | |
# Add one to all labels so that sure background is not 0, but 1 | |
markers = markers + 1 | |
# Mark the unknown region with zero | |
markers[unknown == 255] = 0 | |
# Apply watershed | |
cv2.watershed(input_image, markers) | |
input_image[markers == -1] = [0, 0, 255] # boundary region | |
return input_image | |