firelab-general/examples/grayscale_pyrometry.py

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import cv2 as cv
import numpy as np
img = cv.imread('01-0001.png', 0)
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kernel = np.array([
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[1.3]
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])
img = cv.filter2D(src=img, ddepth=-1, kernel=kernel)
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img = cv.applyColorMap(img, cv.COLORMAP_JET)
cv.imwrite('01-0001-transformed-grayscale.png', img)