A short quiz on low-level vision

Adrian F. Clark

  1. What does Otsu's method do?

  2. Which of the following is not a valid equation for a straight line?

  3. What does one do with the Hough accumulator to find lines?

  4. Which of the following is a sensible region descriptor?

  5. Why is a recursive region labelling algorithm poor in practice?

  6. If a histogram has two peaks, where is the best place to put a threshold to separate foreground from background?

  7. What is the purpose of the Hough transform?

  8. In the parametric Hough transform, what is the accumulator array indexed by?

  9. What shape is the curve drawn in the parametric accumulator array from a single pixel in an image?

  10. How many lines are drawn in the parametric accumulator array from a single pixel in an image?

  11.