# A 5 b 5 c 8 d 8 answer a explanation the mask formed

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a) 5b) -5c) 8d) -8Answer: aExplanation: The mask formed by eliminating diagonal neighbors i.e. 4f(x, y), since each diagonal contain a -2f(x, y), the maskhas 5 as its central coefficient.10. Which of the following mask(s) is/are used to sharpen images by subtracting a blurred version of original image from theoriginal image itself?a) Unsharp maskb) High-boost filterc) All of the mentionedd) None of the mentionedAnswer: cExplanation: Unsharp mask sharpens images by subtracting a blurred version of original image from the original image itself.A high-boost filter is a generalized form of unsharp mask.11. Which of the following gives an expression for high boost filtered image fhb, if f represents an image, f blurred version of f, fsunsharp mask filtered image and A ≥ 1?a) fhb= (A – 1) f(x, y) + f(x, y) – f x, y)b) fhb= A f(x, y) – f(x,y)c) fhb= (A – 1) f(x, y) + fs(x, y)d) All of the mentionedAnswer: dExplanation: A high-boost filter is a generalized form of unsharp mask and is given by:fhb= A f(x, y) – f (x, y)Or, fhb= (A – 1) f(x, y) + f(x, y) – f(x, y), that can be written asfhb= (A – 1) f(x, y) + fs(x, y), where fs(x, y) = f(x, y) – f (x, y).12. If we use a Laplacian to obtain sharp image for unsharp mask filtered image fs(x, y) of f(x, y) as input image, and if the centercoefficient of the Laplacian mask is negative then, which of the following expression gives the high boost filtered image fhb, if2f represent Laplacian?a) fhb= A f(x, y) –2f(x,y)b) fhb= A f(x, y) +2f(x,y)c) fhb=2f(x,y)d) None of the mentioned
Answer: aExplanation: If Laplacian is used to obtain sharp image for unsharp mask filtered image, then.13. If for an input image f(x, y) and the2f represents Laplacian, then if, high boost filtered image is given by.For what value of A this high boost filtering becomes the standard Laplacian sharpening filter?a) 0b) 1c) -1d) ∞Answer: bExplanation: for A=1 the high boost filtering is given by:.Related Posts:
This set of Digital Image Processing Multiple Choice Questions & Answers (MCQs) focuses on “Sharpening Spatial Filters”.1. Which of the following is the primary objective of sharpening of an image?a) Blurring the imageb) Highlight fine details in the imagec) Increase the brightness of the imaged) Decrease the brightness of the imageAnswer: bExplanation: The sharpening of image helps in highlighting the fine details that are present in the image or to enhance the detailsthat are blurred due to some reason like adding noise.2. Image sharpening process is used in electronic printing.a) Trueb) FalseAnswer: aExplanation: The applications of image sharpening is present in various fields like electronic printing, autonomous guidance inmilitary systems, medical imaging and industrial inspection.3. In spatial domain, which of the following operation is done on the pixels in sharpening the image?

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