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Canny edge improvement#14662

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AnumandlaS wants to merge 3 commits intoTheAlgorithms:masterfrom
AnumandlaS:canny-edge-improvement
Closed

Canny edge improvement#14662
AnumandlaS wants to merge 3 commits intoTheAlgorithms:masterfrom
AnumandlaS:canny-edge-improvement

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@AnumandlaS
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Describe your change:

  • Add an algorithm?
  • Fix a bug or typo in an existing algorithm?
  • Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
  • Documentation change?

Checklist:

  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized.
  • I know that pull requests will not be merged if they fail the automated tests.
  • This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
  • All new Python files are placed inside an existing directory.
  • All filenames are in all lowercase characters with no spaces or dashes.
  • All functions and variable names follow Python naming conventions.
  • All function parameters and return values are annotated with Python type hints.
  • All functions have doctests that pass the automated testing.
  • All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
  • If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

@algorithms-keeper algorithms-keeper Bot added the require tests Tests [doctest/unittest/pytest] are required label May 11, 2026
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Click here to look at the relevant links ⬇️

🔗 Relevant Links

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Python:

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import numpy as np


def grayscale(image: np.ndarray) -> np.ndarray:
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function grayscale

# np.uint8 = converts values to 8-bit integers(0-255)


def gaussian_kernel(kernel_size: int = 5, sigma: float = 1.4) -> np.ndarray:
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function gaussian_kernel

return kernel / kernel.sum()


def convolve(image: np.ndarray, kernel: np.ndarray) -> np.ndarray:
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function convolve

return output


def gaussian_blur(
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function gaussian_blur

return convolve(image, kernel)


def sobel_gradients(image: np.ndarray) -> tuple[np.ndarray, np.ndarray]:
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function sobel_gradients

return gradient_magnitude, gradient_direction


def non_maximum_suppression(
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function non_maximum_suppression

return suppressed


def double_threshold(
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function double_threshold

return result, weak, strong


def hysteresis(
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function hysteresis

self.low_threshold_ratio = low_threshold_ratio
self.high_threshold_ratio = high_threshold_ratio

def detect(self, image_path: str) -> np.ndarray:
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As there is no test file in this pull request nor any test function or class in the file computer_vision/cannyedge.py, please provide doctest for the function detect

@algorithms-keeper algorithms-keeper Bot added awaiting reviews This PR is ready to be reviewed tests are failing Do not merge until tests pass labels May 11, 2026
@AnumandlaS AnumandlaS closed this May 11, 2026
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I did not write doctests

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