Created
July 31, 2019 22:17
-
-
Save pknowledge/62ad0d100d6d4df756c0374dee501131 to your computer and use it in GitHub Desktop.
Hough Line Transform opencv python
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import cv2 | |
import numpy as np | |
img = cv2.imread('sudoku.png') | |
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) | |
edges = cv2.Canny(gray, 50, 150, apertureSize=3) | |
cv2.imshow('edges', edges) | |
lines = cv2.HoughLines(edges, 1, np.pi / 180, 200) | |
for line in lines: | |
rho,theta = line[0] | |
a = np.cos(theta) | |
b = np.sin(theta) | |
x0 = a * rho | |
y0 = b * rho | |
# x1 stores the rounded off value of (r * cos(theta) - 1000 * sin(theta)) | |
x1 = int(x0 + 1000 * (-b)) | |
# y1 stores the rounded off value of (r * sin(theta)+ 1000 * cos(theta)) | |
y1 = int(y0 + 1000 * (a)) | |
# x2 stores the rounded off value of (r * cos(theta)+ 1000 * sin(theta)) | |
x2 = int(x0 - 1000 * (-b)) | |
# y2 stores the rounded off value of (r * sin(theta)- 1000 * cos(theta)) | |
y2 = int(y0 - 1000 * (a)) | |
cv2.line(img, (x1, y1), (x2, y2), (0, 0, 255), 2) | |
cv2.imshow('image', img) | |
k = cv2.waitKey(0) | |
cv2.destroyAllWindows() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment