Digital Image Processing Questions and Answers
Q1.
Which of the following is/are more commercially successful image enhancement method in mask mode radiography, an area under medical imaging?
Answer :
Subtraction
Q2.
The subtraction operation results in areas that appear as dark shades of gray. Why?
Answer :
Because the difference in such areas is little, that yields low value
Q3.
The subtracted image needs to be scaled, if 8-bit channel is used to display the subtracted images. So, the method of adding 255 to each pixel and then dividing by 2, has certain lim its. What is/are those lim its?
Answer :
The truncation inherent in division by 2 causes loss in accuracy
Q4.
Which of the following is/are the fundamental factors that need tight control for difference based inspection work?
Answer :
1. Proper registration
2. Controlled illum ination
3. Noise levels should be low enough so that the variation due to noise won’t affect the difference value much
Q5.
When can two random variables be uncorrelated?
Answer :
Their covariance is 0
Q6.
A filter is applied to an image whose response is independent of the direction of discontinuities in the image. The filter is/are ______
Answer :
Isotropic filters
Q7.
In isotropic filtering, which of the following is/are the simplest isotropic derivative operator?
Answer :
Laplacian
Q8.
The Laplacian is which of the following operator?
Answer :
Linear operator
Q9.
Applying Laplacian has which of the following result(s)?
Answer :
1. Produces image having greyish edge lines
2. Produces image having featureless background
Q10.
Applying Laplacian produces image having featureless background which is recovered maintaining the sharpness of Laplacian operation by either adding or subtracting it from the original image depending upon the Laplacian definition used. Which of the following is true based on above statement?
Answer :
If definition used has a negative center coefficient, then subtraction is done
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