Digital Image Processing Questions and Answers
Q1.
A pixel p at coordinates (x, y) has neighbors whose coordinates are given by:
(x+1, y), (x-1, y), (x, y+1), (x, y-1)
This set of pixels is called _______
Answer :
4-neighbors of p
Q2.
Let R be a subset of pixels in an image. How can we define the contour of R?
Answer :
1. If R is a region, and the set of pixels in R have one or more neighbors that are not in R
2. If R is an entire image, then the set of pixels in the first and last rows and columns of R
Q3.
Using gray-level transformation, the basic function linearity deals with which of the following transformation?
Answer :
Q4.
If r be the gray-level of image before processing and s after processing then which expression defines the power-law transformation, for the gray-level in the range [0, L-1]?
Answer :
s = crᵞ, c and ᵞ are positive constants
Q5.
The power-law transformation is given as: s = crᵞ, c and ᵞ are positive constants, and r is the gray-level of image before processing and s after processing. Then, for what value of c and ᵞ does power-law transformation becomes identity transformation?
Answer :
c = ᵞ = 1
Q6.
The transformation s = T(r) producing a gray level s for each pixel value r of input image. Then, if the T(r) is single valued in interval 0 ≤ r ≤ 1, what does it signifies?
Answer :
It guarantees the existence of inverse transformation
Q7.
For the transformation T(r) = [∫0r pr(w) dw], r is gray value of input image, pr(r) is PDF of random variable r and w is a dummy variable. If, the PDF are always positive and that the function under integral gives the area under the function, the transformation is said to be ___
Answer :
1. Single valued
2. Monotonically increasing
Q8.
Which of the following histogram processing techniques is global?
Answer :
1. Histogram Linearization
2. Histogram Specification
3. Histogram Matching
Q9.
Logic operations between two or more images are performed on pixel-by-pixel basis, except for one that is performed on a single image. Which one is that?
Answer :
NOT
Q10.
Which of the following operations are used for masking?
Answer :
NOT, OR
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