NPTEL Digital Image Processing Week 8 Assignment Answers 2024
1. Laplacian operator can be used for which of the following operations?
a) Contrast Adjustment
b) Edge detection
c) Image Averaging
d) All of the above
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2. Which of the following is a first-order derivative operator?
a) Laplacian of Gaussian
b) Laplacian
c) Sobel
d) All of the above
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3.

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4.

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5. Which of the following is true for Laplacian filter?
a) Zero along ramp of constant slope.
b) Robust to noise.
c) Helps in finding appropriate location of edge.
d) Both a and c.
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6.

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7.

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8.

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9. Consider an 8-bit grayscale image with 256 possible gray levels (0 to 255). If a certain gray level
i’ in the image has a normalized CDF of 0.5, what is the corresponding equalized gray level?
a. 127
b. 128
c. 129
d. 130
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10. Which of the following is/are true for histogram of an image?
I. It represents the distribution of intensity values in an image.
II. It represents global appearance of an image.
III. Two different images may have same histogram.
a) Only I
b) Only I and II
c) Only I and III
d) All I, II and III
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