Let R be a subset of pixels in an image. How can we define the contour of R?

Let R be a subset of pixels in an image. How can we define the contour of R? Correct Answer All of the mentioned

For a subset of pixels in an image R The boundary or contour of a region R is the set of pixels in the region that have one or more neighbors that are not in R. In case R is an entire image, then its boundary is defined as the set of pixels in the first and last rows and columns of the image.
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