Digital Image Processing Nptel Week 2 Answers
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Digital Image Processing Nptel Week 2 Answers (July-Dec 2025)
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Q1. Speech signal has a bandwidth of 6 KHz. If every sample is digitized using § bits and the digital speech is to be transmitted over a communication channel, what is the minimum bandwidth requirement of the channel?
a) 16 Kbps
b) 32 Kbps
c) 64 Kbps
d) 96 Kbps
Q2. Which of the following option is true?
a) only 1
b) only 3
c) both 2 and 3
d) all 1, 2, 3
Q3. Compute the Euclidean Distance (D₁), City-block Distance (D₂), and Chessboard distance (D₃) for points p and q, where p = (5, 2) and q = (1, 5). Give answer in the form (D₁, D₂, D₃):
a) (5, 6, 4)
b) (5, 7, 4)
c) (7, 5, 4)
d) (5, 4, 4)
Q4. Consider a 2-D point [2, 5]. Perform a scaling operation in x-axis by 3 units and in y-axis by 7 units. What will be the output?
a) [6, 35]
b) [10, 2]
c) [6, 6]
d) None of the above
Q5. Consider a 3-D point [5, 5, 5]. Perform a scaling operation in both x-axis and y-axis by 5 units. What will be the output?
a) [10, 10, 5]
b) [10, 10, 10]
c) [25, 25, 5]
d) None of the above
Q6. Consider two 8-bit images f₁ = (50, 55, 75) and f₂ = (50, 70, 230). The addition and subtraction of images are given by f₁ + f₂ and f₁ − f₂. What is the result?
a) f₁ + f₂ = (100, 125, 255); f₁ − f₂ = (0, 0, 0)
b) f₁ + f₂ = (100, 125, 255); f₁ − f₂ = (0, 0, 20)
c) f₁ + f₂ = (105, 125, 255); f₁ − f₂ = (5, 0, 125)
d) f₁ + f₂ = (100, 125, 230); f₁ − f₂ = (0, 0, 20)
Q7. In formula g(x,y) = T[f(x,y)], T is the
a) Transformed image
b) Transformation vector
c) Transformation theorem
d) Transformation function
Q8. Consider an image point [1,1]. Rotation of the image point around the origin by 45° in anticlockwise direction is given by:
a) [0, √2]
b) [0, 2.77]
c) [1, 2√2]
d) [1, √2]
Q9. Consider a 3-D point [5, 5, 5]. Perform a shifting operation in both x-axis and y-axis by 5 units.
a) [10, 10, 5]
b) [10, 10, 10]
c) [25, 25, 5]
d) None of the above
Q10. The output of an image sensor takes values between 0.0 and 10.0. If it is quantized by a uniform quantizer with 256 levels, what will be the transition (tₖ) and reconstruction level (rₖ)?
a) tₖ = k/256, k = 1,2,…,257; rₖ = tₖ, k = 1,2,…,256
b) tₖ = k/256, k = 1,2,…,257; rₖ = tₖ − ΔL, k = 1,2,…,256
c) tₖ = k/256, k = 1,2,…,257; rₖ = tₖ + Δk, k = 1,2,…,256
d) tₖ = k/256, k = 1,2,…,257; rₖ = tₖ + k, k = 1,2,…,256
These are Digital Image Processing Nptel Week 2 Answers