The Python Oracle

Drawing true filled circle on an image

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Chapters
00:00 Question
01:14 Accepted answer (Score 2)
01:56 Answer 2 (Score 4)
02:12 Thank you

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Full question
https://stackoverflow.com/questions/4953...

Accepted answer links:
[image]: https://i.stack.imgur.com/YsgmX.png

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https://meta.stackexchange.com/help/lice...

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Tags
#python #matplotlib #plot #geometry #scikitimage

#avk47


ANSWER 1

Score 4


draw circles in the img. 

import cv2
import numpy as np

img = np.zeros([474, 474])

cv2.circle(img, (100,100), 5, 255, -1)
cv2.circle(img, (200,200), 30, 255, -1)

cv2.imshow('image', img)
cv2.waitKey(0)
cv2.destroyAllWindows()


ACCEPTED ANSWER

Score 2


When drawing a circle in OpenCV, there are several parameters that can be chosen, one of them is used to define the type of the circle boundary, you have 4 types:

  • Filled
  • 4-connected line
  • 8-connected line
  • antialiased line

You can see the different effect on the following image (in same order) enter image description here

An example code (in C++)

circle(src,cv::Point(300,300), 10, Scalar(0,0,255), 1, FILLED);