Binary Dilation

Problem

Dilate a binary mask with a full 3x3 structuring element and zero padding.

A pixel becomes 1 if any pixel in its 3x3 neighborhood (clipped to the image) is 1. The output has the same shape as the mask.

case 1

in: [[[0,0,0,0],[0,0,1,0],[0,0,0,0],[0,0,0,0]]]

expected: [[0,1,1,1],[0,1,1,1],[0,1,1,1],[0,0,0,0]]

case 2

in: [[[1,0],[0,0]]]

expected: [[1,1],[1,1]]

case 3

in: [[[0,0],[0,0]]]

expected: [[0,0],[0,0]]

case 4

in: [[[1,1],[1,1]]]

expected: [[1,1],[1,1]]

Starter codePython

def binary_dilate(mask):
    # Your code here
    pass

4 test cases · run your code against them in the editor