Digital Image Processing Nptel Week 1 Answers
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Digital Image Processing Nptel Week 1 Answers (July-Dec 2025)
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Question 1. What is the number of bits required to store a 100 x 100 grayscale image with 256 gray levels?
a) 2,560,000
b) 10,000
c) 80,000
d) 240,000
Question 2. In frequency domain, what is the equivalent operation of product of two functions in spatial domain?
a) correlation
b) convolution
c) Fourier transform
d) fast Fourier transform
Question 3. What effect will happen if sampling frequency is less than Nyquist rate?
a) summation
b) smoothing
c) sharpening
d) aliasing
Question 4. What is the sampling frequency more than Nyquist rate called?
a) Nyquist sampling
b) over sampling
c) under sampling
d) critical sampling
Question 5. Width and height of an image are 180 pixels and 180 pixels respectively. This image was scanned at 600 dpi. What will be the physical size of the image?
a) 3.0 inches x 3.0 inches
b) 0.4 inches x 0.4 inches
c) 0.3 inches x 0.3 inches
d) 1.4 inches x 1.4 inches
Question 6. What will be the value of delta function, δ(t − 2), at t = 0?
a) Infinity
b) 0
c) 0.5
d) 1
Question 7. What is the purpose of using a low pass filter?
a) Resizing
b) Sharpening
c) Smoothing
d) None of the above
Question 8. Which of the following should be used for filling gaps in digital image that results from operations like zooming, shrinking, rotation etc.?
a) Sampling
b) Filtering
c) Interpolation
d) None of the above
Question 9. Assuming that a 5m high structure is observed from a distance of 10m. What is the size of image in a pin-hole camera? Assume that the distance between the lens and imaging plane is 10mm.
a) 10mm
b) 5cm
c) 5mm
d) 10cm
Question 10. What is the process of extracting information from an image?
a) Image compression
b) Image analysis
c) Image restoration
d) Image enhancement
These are Digital Image Processing Nptel Week 1 Answers