Rounded corners dilation (Image Processing)-CodePudding

I want to perform an Dilation operation while having rounded corners. Something like this :

What I tried :

import numpy as np
import cv2

img = cv2.imread(test.jpg)
kernel = np.array([[0,1,0],
                   [1,1,1],
                   [0,1,0]], dtype=np.uint8)
img_d = cv2.dilate(img, kernel, iterations=45)

Image used :

My Question is : Can we get rounded corners just by changing the kernel or should we add a further processing step to achieve this ?

NOTE : My goal is not to create a rounded square... I used this example just to explain the idea of getting rounded corners with a dilation operation.

CodePudding user response：

I figured out a way thanks to "Christoph Rackwitz" comment.

The idea is pretty simple. We need to use a bigger kernel with a circle shape and reduce the number of Dilation iterations.

import numpy as np import cv2 kernel = np.zeros((100,100), np.uint8) cv2.circle(kernel, (50,50), 50, 255, -1) plt.imshow(kernel, cmap="gray")

And then use this kernel with just one iteration :

img = cv2.imread(test.jpg) img_d = cv2.dilate(img, kernel, iterations=1) plt.imshow(kernel, cmap="gray")

CodePudding user response：

OpenCV also allows you choose a kernel of your shape and size with cv2.getStructuringElement.