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Why does scipy.ndimage.label assign labels starting from 1 instead of 0?

hard📝 Conceptual Q10 of 15
SciPy - Image Processing (scipy.ndimage)
Why does scipy.ndimage.label assign labels starting from 1 instead of 0?
ABecause 0 is reserved to represent background pixels.
BBecause 0 is used to indicate the first connected component.
CBecause labels must be negative integers.
DBecause 0 causes runtime errors in labeling.
Step-by-Step Solution
Solution:

  1. Step 1: Understand label assignment convention

    In connected component labeling, 0 is reserved for background (non-feature) pixels.

  2. Step 2: Reason why labels start at 1

    Labels start at 1 to distinguish connected components from background.

  3. Final Answer:

    Because 0 is reserved to represent background pixels. -> Option A

  4. Quick Check:

    Label 0 = background, labels start at 1 for components [OK]
Quick Trick: Label 0 always means background pixels [OK]
Common Mistakes:
  • Thinking 0 is a component label
  • Assuming labels can be negative
  • Believing 0 causes errors

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