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Digital Signal & Image Processing: Image Enhancement in Spatial domain
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Digital Signal & Image Processing: Image Enhancement in Spatial domain
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25 Questions

1. If r be the gray-level of image before processing and s after processing then which expression helps to obtain the negative of an image for the gray-level in the range [0, L-1]?
2. Log transformation is generally used in which of the following device(s)?
3. Noise reduction is obtained by blurring the image using smoothing filter.
4. What is the thickness of the edges produced by first order derivatives when compared to that of second order derivatives?
5. A bright image will have what kind of histogram, when the histogram, h(rk) = nk, rk the kth gray level and nk total pixels with gray level rk, is plotted nk versus rk?
6. 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?
7. Which of the following shows three basic types of functions used frequently for image enhancement?
8. The response for linear spatial filtering is given by the relationship __________
9. If f(x,y) is an image function of two variables, then the first order derivative of a one dimensional function, f(x) is:
10. In neighborhood operation for spatial filtering using square mask of n*n, which of the following approach is/are used to obtain a perfectly filtered result irrespective of the size?
11. First order derivative can enhance the fine detail in the image compared to that of second order derivative.
12. In Histogram Matching r and z are gray level of input and output image and p stands for PDF, then, what does pz(z) stands for?
13. In spatial domain, which of the following operation is done on the pixels in sharpening the image?
14. Median filter belongs to which category of filters?
15. Which of the following is the disadvantage of using smoothing filter?
16. Which of the following method is/are used for padding the image?
17. Median filters are effective in the presence of impulse noise.
18. Which of the following derivatives produce a double response at step changes in gray level?
19. Which of the following transformation is used cathode ray tube (CRT) devices?
20. What is the sum of all components of a normalized histogram?
21. Smoothing spatial filters doesn't smooth the false contours.
22. Which of the following filters response is based on ranking of pixels?
23. What is gamma correction?
24. In neighborhood operation for spatial filtering if a square mask of size n*n is used it is restricted that the center of mask must be at a distance ≥ (n .
25. Image differentiation enhances the edges, discontinuities and deemphasizes the pixels with slow varying gray levels.

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