Question

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

(a) If R is a region, and the set of pixels in R have one or more neighbors that are not in R

(b) If R is an entire image, then the set of pixels in the first and last rows and columns of R

(c) All of the mentioned

(d) None of the mentioned

The question was posed to me during an interview.

This is a very interesting question from Relationship between Pixels and Image Enhancement Basics in section Image Enhancement of Digital Image Processing

Answer 1

Correct answer is (c) All of the mentioned

The best explanation: 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.