Computer Vision Nptel Week 1 Assignment Answers
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Computer Vision Nptel Week 1 Assignment Answers (July-Dec 2025)
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Question 1. Which transform is most commonly used in frequency domain image processing?
a) Laplace Transform
b) Fourier Transform
c) Z-Transform
d) Hadamard Transform
Question 2. X is a normally distributed variable with mean μ = 30 and standard deviation σ = 4. Compute P(26 < X < 38). (Note: P(z > 2.0) = 0.0228)
a) 0.0238
b) 0.9380
c) 0.8185
d) 0.9772
Question 3. Consider the following 5 x 5 image array to answer the following question:
5 6 4 6 4
2 2 0 3 4
1 2 4 0 5
5 1 3 2 1
5 2 6 4 6
What is the value after histogram equalization at location (3,2) shown with asterisk mark in the image array?
a) 2
b) 3
c) 4
d) 5
Question 4. A continuous time signal is given by x(t) = e^(-t)u(t). Its Fourier transform X(jω) is given by
a) 1/(1 + jω)
b) 1/(2 + jω)
c) 1/(8 + jω)
d) 1/(0 + 2jω)
These are Computer Vision Nptel Week 1 Assignment Answers
Question 5. Consider two images each of size 32×32, namely I₁ and I₂. Image I₁ has 612 and 412 pixels for foreground and background, respectively. Image I₂ has 412 and 612 pixels for foreground and background, respectively. One pixel is selected at random from one of the two images and it is found to be a background pixel. Find the probability that it was drawn from image I₁.
a) 0.4
b) 0.04
c) 0.6
d) 0.24
Question 6. Which of the following statements about image processing fundamentals are correct?
a) Grayscale conversion reduces an image to a single channel by averaging RGB values.
b) Histogram equalization increases contrast by redistributing pixel intensities non-linearly.
c) Frequency-domain filtering (e.g., Fourier Transform) modifies an image by altering its frequency components.
d) Morphological operations (e.g., erosion/dilation) are only applicable to binary images.
Question 7. Consider the following 5×5 image array and 3×3 Sobel operator. What is the output of 3×3 Sobel operator at location (2,2) shown with asterisk mark in the image array?
a) -8
b) -19
c) -13
d) 17
These are Computer Vision Nptel Week 1 Assignment Answers
Question 8. Consider the following 3-bit grayscale image:
0 1 7 0 7 3
4 0 6 7
0 3 2 1 5
4 1 0 6
What is the threshold according to Otsu method?
a) 2
b) 3
c) 4
d) 7
Question 9. Consider a 10-bit grayscale image with dimension 32×32. What will be the range of values in the X-axis of its histogram?
a) 0 to 1024
b) 1 to 1024
c) 0 to 1023
d) 1 to 1023
Question 10. Consider the following 3-bit grayscale image:
0 1 7 3
2 4 3 0
0 2 1 7
4 1 5 6
What is the value when vertical Prewitt operator and horizontal Prewitt operator are applied on the orange-colored pixel?
a) 1 and -4
b) 4 and 2
c) 4 and 1
d) -4 and 1
These are Computer Vision Nptel Week 1 Assignment Answers
