Help in understanding Color-Based Segmentation Using the L*a*b* Color Space Example

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Hi I am working on the picture I have attached below. I want to extract the boxes out of the picture by using Color Segmentation, for that I am following the example
But I have problem in understanding following things.
  1. what are " regioncoordinates"
  2. What happens in the step 17. lab_fabric = RGB2Lab(fabric);
  3. My picture doesn't have pure red,green and blue components, How can I modify this example for my boxes.

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