Q. Which of the following operation(s) is/are equivalent to negative transformation?

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Q. Which of the following operations are used for masking?

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Q. Two images having one pixel gray value 01010100 and 00000101 at the same location, are operated against AND operator. What would be the resultant pixel gray value at that location in the enhanced image?

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Q. Which of the following arithmetic operator is primarily used as a masking operator in enhancement?

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Q. Which of the following is/are more commercially successful image enhancement method in mask mode radiography, an area under medical imaging?

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Q. The subtraction operation results in areas that appear as dark shades of gray. Why?

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Q. If the images are displayed using 8-bits, then, what is the range of the value of an image if the image is a result of subtraction operation?

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Q. The subtracted image needs to be scaled, if 8-bit channel is used to display the subtracted images. So, the method of adding 255 to each pixel and then dividing by 2, has certain limits. What is/are those limits?

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Q. Which of the following is/are the fundamental factors that need tight control for difference based inspection work?

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Q. When can two random variables be uncorrelated?

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Q. In Image Averaging enhancement method assumptions are made for a noisy image g(x, y). What is/are those?

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Q. The standard deviation ‘σ’ at any point in image averaging: σḡ(x, y) = 1/√K σɳ(x, y), where ḡ(x, y) is the average image formed by averaging K different noisy images and ɳ(x, y) is the noise added to an original image f(x, y). What is the relation between K and the variability of the pixel values at each location (x, y)?

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Q. A filter is applied to an image whose response is independent of the direction of discontinuities in the image. The filter is/are ________

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Q. In isotropic filtering, which of the following is/are the simplest isotropic derivative operator?

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Q. The Laplacian is which of the following operator?

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Q. The Laplacian ∇^2 f=[f(x + 1, y) + f(x – 1, y) + f(x, y + 1) + f(x, y – 1) – 4f(x, y)], gives an isotropic result for rotations in increment by what degree?

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Q. The Laplacian incorporated with diagonal directions, i.e. ∇^2 f=[f(x + 1, y) + f(x – 1, y) + f(x, y + 1) + f(x, y – 1) – 8f(x, y)], gives an isotropic result for rotations in increment by what degree?

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Q. Applying Laplacian has which of the following result(s)?

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Q. Applying Laplacian produces image having featureless background which is recovered maintaining the sharpness of Laplacian operation by either adding or subtracting it from the original image depending upon the Laplacian definition used. Which of the following is true based on above statement?

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Q. A mask of size 3*3 is formed using Laplacian including diagonal neighbors that has central coefficient as 9. Then, what would be the central coefficient of same mask if it is made without diagonal neighbors?

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