如何将图像转换为组 colors？

Question

Sorry if this has been asked before, but I couldn't find anything without having a more descriptive name of the transformation.

I would like to apply a transform on either a PIL image or an array of floats that represent a black and white image. Ideally the transform would alter the image like this (sorry, made in paint with a track pad):

I would consider it a bonus if it could preserve a black border around each color region, but that might be asking a lot depending on how the transform works. Thanks in advance:)

Answer 1

You can try morphological operation on the image:

import cv2 as cv
import numpy as np
img = cv.imread('img.png',0)

kernel = np.ones((5,5),np.uint8)
# Opening is erosion followed by dilation. It is useful in removing noise.
opening = cv.morphologyEx(img, cv.MORPH_OPEN, kernel)