Created
February 20, 2023 16:59
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OpenCV Erode & Dilation demo
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| from __future__ import print_function | |
| import cv2 as cv | |
| import numpy as np | |
| import argparse | |
| src = None | |
| erosion_size = 0 | |
| max_elem = 2 | |
| max_kernel_size = 21 | |
| title_trackbar_element_shape = 'Element:\n 0: Rect \n 1: Cross \n 2: Ellipse' | |
| title_trackbar_kernel_size = 'Kernel size:\n 2n +1' | |
| title_erosion_window = 'Erosion Demo' | |
| title_dilation_window = 'Dilation Demo' | |
| def main(image): | |
| global src | |
| src = cv.imread(cv.samples.findFile(image)) | |
| if src is None: | |
| print('Could not open or find the image: ', image) | |
| exit(0) | |
| cv.namedWindow(title_erosion_window) | |
| cv.createTrackbar(title_trackbar_element_shape, title_erosion_window, 0, max_elem, erosion) | |
| cv.createTrackbar(title_trackbar_kernel_size, title_erosion_window, 0, max_kernel_size, erosion) | |
| cv.namedWindow(title_dilation_window) | |
| cv.createTrackbar(title_trackbar_element_shape, title_dilation_window, 0, max_elem, dilatation) | |
| cv.createTrackbar(title_trackbar_kernel_size, title_dilation_window, 0, max_kernel_size, dilatation) | |
| erosion(0) | |
| dilatation(0) | |
| cv.waitKey() | |
| # optional mapping of values with morphological shapes | |
| def morph_shape(val): | |
| if val == 0: | |
| return cv.MORPH_RECT | |
| elif val == 1: | |
| return cv.MORPH_CROSS | |
| elif val == 2: | |
| return cv.MORPH_ELLIPSE | |
| def erosion(val): | |
| erosion_size = cv.getTrackbarPos(title_trackbar_kernel_size, title_erosion_window) | |
| erosion_shape = morph_shape(cv.getTrackbarPos(title_trackbar_element_shape, title_erosion_window)) | |
| element = cv.getStructuringElement(erosion_shape, (2 * erosion_size + 1, 2 * erosion_size + 1), | |
| (erosion_size, erosion_size)) | |
| erosion_dst = cv.erode(src, element) | |
| cv.imshow(title_erosion_window, erosion_dst) | |
| def dilatation(val): | |
| dilatation_size = cv.getTrackbarPos(title_trackbar_kernel_size, title_dilation_window) | |
| dilation_shape = morph_shape(cv.getTrackbarPos(title_trackbar_element_shape, title_dilation_window)) | |
| element = cv.getStructuringElement(dilation_shape, (2 * dilatation_size + 1, 2 * dilatation_size + 1), | |
| (dilatation_size, dilatation_size)) | |
| dilatation_dst = cv.dilate(src, element) | |
| cv.imshow(title_dilation_window, dilatation_dst) | |
| if __name__ == "__main__": | |
| parser = argparse.ArgumentParser(description='Code for Eroding and Dilating tutorial.') | |
| parser.add_argument('--input', help='Path to input image.', default='LinuxLogo.jpg') | |
| args = parser.parse_args() | |
| main(args.input) |
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