Sharpen Filter

Problem

Sharpen a grayscale image with the 3x3 kernel [[0, -1, 0], [-1, 5, -1], [0, -1, 0]].

Apply valid-mode cross-correlation and return integer values. Constant regions are unchanged; no clamping is applied.

case 1

in: [[[7,7,7],[7,7,7],[7,7,7]]]

expected: [[7]]

case 2

in: [[[0,0,0],[0,10,0],[0,0,0]]]

expected: [[50]]

case 3

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

expected: [[5]]

case 4

in: [[[1,1,1,1],[1,5,5,1],[1,5,5,1],[1,1,1,1]]]

expected: [[13,13],[13,13]]

Starter codePython

def sharpen(image):
    # Your code here
    pass

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