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

View solution

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?

View solution

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?

View solution

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

View solution

Q. When can two random variables be uncorrelated?

View solution

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

View solution

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)?

View solution

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

View solution

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

View solution

Q. The Laplacian is which of the following operator?

View solution

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?

View solution

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?

View solution

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

View solution

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?

View solution

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?

View solution

Q. Which of the following mask(s) is/are used to sharpen images by subtracting a blurred version of original image from the original image itself?

View solution

Q. Which of the following gives an expression for high boost filtered image fhb, if f represents an image, f blurred version of f, fs unsharp mask filtered image and A ≥ 1?

View solution

Q. 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 center coefficient of the Laplacian mask is negative then, which of the following expression gives the high boost filtered image fhb, if ∇^2 f represent Laplacian?

View solution

Q. “For very large value of A, a high boost filtered image is approximately equal to the original image”. State whether the statement is true or false?

View solution

Q. Subtracting Laplacian from an image is proportional to which of the following?

View solution