CODEWITHSUNDEEP
pythonopencvimage-processingcolor-spacecontrast
Sivaram Rasathurai
Sivaram Rasathurai

Reputation: 6373

Get contrast for each channel in an image opencv python

How to calculate each channel contrast in images? Since they are lot of contrast definitions out there

  1. Webar Contrast
  2. Michelson Contrast
  3. RMS contrast

I need to calculate these contrasts.

Upvotes: 0

Views: 740

Answers (1)

Shmn
Shmn

Reputation: 703

from PIL import Image
import numpy as np
from numpy import mean, sqrt, square
im = Image.open("leaf.jpg") # Image file name
pixels = list(im.getdata())
width, height = im.size
pixels = np.asarray([pixels[i * width:(i + 1) * width] for i in range(height)], dtype=int)

ch_1 = pixels[:,:,0]
ch_2 = pixels[:,:,1]
ch_3 = pixels[:,:,2]

rms_of_ch1 = sqrt(mean(square(ch_1)))
rms_of_ch2 = sqrt(mean(square(ch_2)))
rms_of_ch3 = sqrt(mean(square(ch_3)))

Upvotes: 2

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