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I am reading the Digital Image Processing book by Gonzalez and i can't seem to understand Bottom-hat transformation. Can anyone explain it to me in easy terms?

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The explanation in Wikipedia for Top-hat transform - Properties seems pretty simple, for the bottom-hat, another name for the black top-hat.

The black top-hat returns an image, containing the "objects" or "elements" that:

  • are "smaller" than the structuring element,
  • are darker than their surroundings.
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