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Compute image histogram
def histogram(img_channel):
#hist, _ = np.histogram(im_channele, bins = 256, range = (0, 256))
hist = np.array([0] * 256)
height = len(img_channel)
width = len(img_channel[0])
for row in range(height):
for col in range(width):
hist[img_channel[row, col]] += 1
return hist
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