Gamma Auto from Mean

Problem

Choose the gamma correction that maps the image mean intensity to 0.5.

Compute gamma = log(0.5) / log(mean / 255) and round to 4 decimal places. Return 1.0 when the mean is 0 or 255.

Hint

Divide the mean by 255 before taking logarithms.

case 1

in: [[[128,128],[128,128]]]

expected: 1.0057

case 2

in: [[[64,64],[64,64]]]

expected: 0.5014

case 3

in: [[[192,192],[192,192]]]

expected: 2.4427

case 4

in: [[[0,0]]]

expected: 1

Starter codePython

def auto_gamma(image):
    # Your code here
    pass

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