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RMS Contrast

Unsolved
Computer Vision

Difficulty: 2 | Problem written by mesakarghm
The RMS contrast value of an image is defined as the standard deviation of the pixel values for the given image. 

Write a function rms_contrast(img) which takes in a grayscale image as input (represented as 2D NumPy array) and returns the RMS contrast of the input image.  The output should be a floating point value representing the RMS Contrast of the input image. 

Sample Input:
<class 'numpy.ndarray'>
img: [[ 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 'float'>
59.05178744119436

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