Scanned colour checker does not corrected right

[farhanalfin]

I wrote the following script to correct image scanned with colour checker but I faced incorrect color correction, around the colorchecker is the background of scanner cover, what is the wrong !!!

After publishing the discussion , I noticed that there is negative color value in corrected image, and I founded that this is due to there is negative value in REFERENCE SWATCHES.

import colour
import matplotlib.pyplot as plt

from colour_checker_detection import (
detect_colour_checkers_segmentation)

image_RGB = colour.io.read_image("detection/Yeni-X-rite3.jpg")

decoded_image = colour.cctf_decoding(image_RGB)

swatches = detect_colour_checkers_segmentation(decoded_image)

D65 = colour.ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['D65']
REFERENCE_COLOUR_CHECKER = colour.CCS_COLOURCHECKERS['ColorChecker24 - After November 2014']

REFERENCE_SWATCHES = colour.XYZ_to_RGB(colour.xyY_to_XYZ(list(REFERENCE_COLOUR_CHECKER.data.values())), REFERENCE_COLOUR_CHECKER.illuminant, D65, colour.RGB_COLOURSPACES['sRGB'].XYZ_to_RGB_matrix)

correctedimage = colour.cctf_encoding( colour.colour_correction(decoded_image, swatches[0], REFERENCE_SWATCHES))

f = plt.figure()
f.add_subplot(1, 2, 1)
plt.imshow(image_RGB)
plt.title("Original image")
f.add_subplot(1, 2, 2)
plt.imshow(correctedimage)
plt.title("Corrected image")
plt.show()