Question

What does a shift up and right in the curves of isopreference curve simply means? Verify in terms of N (number of pixels) and k (L=2k, L is the gray level) values.

(a) Smaller values for N and k, implies a better picture quality

(b) Larger values for N and k, implies low picture quality

(c) Larger values for N and k, implies better picture quality

(d) Smaller values for N and k, implies low picture quality

I have been asked this question in quiz.

I would like to ask this question from Spatial and Gray-Level Resolution and Aliasing in division Image Enhancement of Digital Image Processing

Answer 1

Correct answer is (c) Larger values for N and k, implies better picture quality

The explanation: Points lying on an isopreference curve correspond to images of equal subjective quality. It was found that the isopreference curves tended to shift right and upward with the details of the image. So, a shift up and right in the curves simply means larger values for N and k, implying better picture quality.