Why is my colour checker not detected?

[enomotokenji]

Hi, thanks for providing this awesome resource! I tried to use the example notebook to detect the color checker in my attached image. However, detect_colour_checkers_segmentation returned nothing. How can I detect the color checker and get to know the colors? I would appreciate any thoughts!

My environment (output of colour.utilities.describe_environment():

===============================================================================
*                                                                             *
*   Interpreter :                                                             *
*       python : 3.7.10 | packaged by conda-forge | (default, Feb 19 2021,    *
*   15:59:12)                                                                 *
*                [Clang 11.0.1 ]                                              *
*                                                                             *
*   colour-science.org :                                                      *
*       colour : 0.3.16                                                       *
*       colour-checker-detection : 0.1.2                                      *
*                                                                             *
*   Runtime :                                                                 *
*       imageio : 2.9.0                                                       *
*       matplotlib : 3.4.2                                                    *
*       numpy : 1.21.0                                                        *
*       pandas : 1.3.0                                                        *
*       scipy : 1.7.0                                                         *
*       six : 1.16.0                                                          *
*       opencv : 4.5.2                                                        *
*                                                                             *
===============================================================================

[KelSolaar]

Hi @enomotokenji,

So this is an unfortunate case where the shadows of your light are so strong and sharp that they are creating double-squares during the segmentation:

Assuming you are running the latest develop branch you could simply pass 'swatches_count_maximum': 48 and get the checker values back:

[array([[ 0.2446759 ,  0.20135735,  0.10497807],
       [ 0.82287437,  0.66488385,  0.361873  ],
       [ 0.23665544,  0.3670197 ,  0.39196956],
       [ 0.18531594,  0.25926286,  0.12164727],
       [ 0.4375883 ,  0.4612287 ,  0.48310035],
       [ 0.37233242,  0.7886875 ,  0.57492375],
       [ 0.99599016,  0.64306736,  0.1811679 ],
       [ 0.17159075,  0.26123947,  0.42682588],
       [ 0.8812704 ,  0.43162864,  0.2225455 ],
       [ 0.20280306,  0.1497424 ,  0.1631238 ],
       [ 0.633233  ,  0.91553074,  0.30525315],
       [ 0.9965556 ,  0.839741  ,  0.23087819],
       [ 0.1045835 ,  0.16408023,  0.31992856],
       [ 0.25987846,  0.55509406,  0.25219542],
       [ 0.7833722 ,  0.30996588,  0.13789408],
       [ 0.99857754,  0.9986594 ,  0.38273954],
       [ 0.89441854,  0.47030583,  0.4065137 ],
       [ 0.15916848,  0.4318387 ,  0.5061031 ],
       [ 1.        ,  1.        ,  1.        ],
       [ 0.9990716 ,  0.999207  ,  0.99289876],
       [ 0.7762327 ,  0.9258538 ,  0.64827216],
       [ 0.3931497 ,  0.4735417 ,  0.33471218],
       [ 0.1752104 ,  0.21351771,  0.15394557],
       [ 0.06743193,  0.08037543,  0.05674927]], dtype=float32)]

[enomotokenji]

Hi @KelSolaar,

It worked as expected with 'swatches_count_maximum': 48!
Thank you for your help!