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added laplacian_filter file (#9783)
* added laplacian_filter file * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * updated laplacian.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * updated laplacian_py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * updated laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * updated laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * updated laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * required changes to laplacian file * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * changed laplacian_filter.py * changed laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * changed laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * changed laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * updated laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * update laplacian_filter.py * update laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * update laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * changed laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * changed laplacian_filter.py * changed laplacian_filter.py * changed laplacian_filter.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update laplacian_filter.py * Add a test --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Christian Clauss <cclauss@me.com>
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ojas wani
GitHub
parent
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81
digital_image_processing/filters/laplacian_filter.py
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81
digital_image_processing/filters/laplacian_filter.py
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# @Author : ojas-wani
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# @File : laplacian_filter.py
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# @Date : 10/04/2023
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import numpy as np
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from cv2 import (
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BORDER_DEFAULT,
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COLOR_BGR2GRAY,
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CV_64F,
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cvtColor,
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filter2D,
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imread,
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imshow,
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waitKey,
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)
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from digital_image_processing.filters.gaussian_filter import gaussian_filter
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def my_laplacian(src: np.ndarray, ksize: int) -> np.ndarray:
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"""
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:param src: the source image, which should be a grayscale or color image.
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:param ksize: the size of the kernel used to compute the Laplacian filter,
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which can be 1, 3, 5, or 7.
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>>> my_laplacian(src=np.array([]), ksize=0)
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Traceback (most recent call last):
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...
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ValueError: ksize must be in (1, 3, 5, 7)
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"""
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kernels = {
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1: np.array([[0, -1, 0], [-1, 4, -1], [0, -1, 0]]),
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3: np.array([[0, 1, 0], [1, -4, 1], [0, 1, 0]]),
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5: np.array(
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[
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[0, 0, -1, 0, 0],
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[0, -1, -2, -1, 0],
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[-1, -2, 16, -2, -1],
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[0, -1, -2, -1, 0],
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[0, 0, -1, 0, 0],
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]
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),
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7: np.array(
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[
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[0, 0, 0, -1, 0, 0, 0],
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[0, 0, -2, -3, -2, 0, 0],
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[0, -2, -7, -10, -7, -2, 0],
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[-1, -3, -10, 68, -10, -3, -1],
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[0, -2, -7, -10, -7, -2, 0],
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[0, 0, -2, -3, -2, 0, 0],
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[0, 0, 0, -1, 0, 0, 0],
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]
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),
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}
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if ksize not in kernels:
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msg = f"ksize must be in {tuple(kernels)}"
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raise ValueError(msg)
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# Apply the Laplacian kernel using convolution
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return filter2D(
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src, CV_64F, kernels[ksize], 0, borderType=BORDER_DEFAULT, anchor=(0, 0)
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)
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if __name__ == "__main__":
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# read original image
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img = imread(r"../image_data/lena.jpg")
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# turn image in gray scale value
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gray = cvtColor(img, COLOR_BGR2GRAY)
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# Applying gaussian filter
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blur_image = gaussian_filter(gray, 3, sigma=1)
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# Apply multiple Kernel to detect edges
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laplacian_image = my_laplacian(ksize=3, src=blur_image)
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imshow("Original image", img)
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imshow("Detected edges using laplacian filter", laplacian_image)
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waitKey(0)
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