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Percentile Stretching

Unsolved
Computer Vision

Difficulty: 6 | Problem written by mesakarghm
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Write a function percentile_stretching(image), which takes in a grayscale image as input, clips the 2-98% of the histogram values and returns the contrast stretched image as output using percentile stretching. 

Percentile Stretching formula:

\(P_i = {pixel - X_{min}\over X_{max} - X_{min}} * 255\)

The maximum and minimum value for Pi will be 255 and 0 respectively. 

 

Sample Input:
<class 'numpy.ndarray'>
image: [[ 1 7 119 13 12] [ 11 21 61 81 91] [ 5 66 6 5 5] [ 5 66 166 145 155] [ 5 66 136 145 155]]

Expected Output:
<class 'numpy.ndarray'>
[[ 0 6 187 16 14] [ 13 29 93 126 142] [ 3 101 4 3 3] [ 3 101 255 229 245] [ 3 101 215 229 245]]

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numpy has been already imported as np (import numpy as np)