Image Pyramid Downsample

Problem

Downsample an image by a factor of 2 using decimation.

Keep the pixel at every even row and every even column, so a 3x3 input becomes 2x2 and a 1x1 input stays 1x1.

case 1

in: [[[0,1,2,3],[4,5,6,7],[8,9,10,11],[12,13,14,15]]]

expected: [[0,2],[8,10]]

case 2

in: [[[1,2,3],[4,5,6],[7,8,9]]]

expected: [[1,3],[7,9]]

case 3

in: [[[1,2],[3,4]]]

expected: [[1]]

case 4

in: [[[42]]]

expected: [[42]]

Starter codePython

def pyramid_downsample(image):
    # Your code here
    pass

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