Question 17
The gradient of an image I, points in the direction of most rapid change in intensity, taking image derivatives accentuates (a) ____________ frequencies and hence amplifies noise, since the proportion of noise to signal is larger at (b) __________ frequencies. The solution to this is (c) _________ the image prior to computing gradients.
Based on the above data, answer the given subquestions.
Enter the correct answer for (b).
NOTE: Enter the exact answer without any space in the beginning or at the end.