162. State the statement true or false: “BLPF has sharp discontinuity and ILPF doesn’t, and so ILPF establishes a clear cutoff b/w passed and filtered frequencies”.

A. True

B. False

163. A Butterworth filter of what order has no ringing?

A. 1

B. 2

C. 3

D. 4

161. In frequency domain terminology, which of the following is defined as “obtaining a highpass filtered image by subtracting from the given image a lowpass filtered version of itself”?

A. Emphasis filtering

B. Unsharp masking

C. Butterworth filtering

D. None of the mentioned

162. Which of the following is/ are a generalized form of unsharp masking?

A. Lowpass filtering

B. High-boost filtering

C. Emphasis filtering

D. All of the mentioned

163. High boost filtered image is expressed as f_{hb} = A f(x, y) – for(x, y), where f(x, y) is the input image, A is a constant, and f_{lp}(x, y) is the lowpass filtered version of f(x, y). Which of the following fact validates if A=1?

A. High-boost filtering reduces regular Highpass filtering

B. High-boost filtering reduces regular Lowpass filtering

C. All of the mentioned

D. None of the mentioned

164. High boost filtered image is expressed as f_{hb} = A f(x, y) – f_{lp}(x, y), where f(x, y) is the input image, A is a constant and f_{lp}(x, y) is the lowpass filtered version of f(x, y). Which of the following fact(s) validates if A increases past 1?

A. The contribution of the image itself becomes more dominant

B. The contribution of the highpass filtered version of the image becomes less dominant

C. Both 1 and 2

D. None of the mentioned

165. If, F_{hp}(u, v)=F(u, v) – F_{lp}(u, v) and F_{lp}(u, v) = H_{lp}(u, v)F(u, v), where F(u, v) is the image in frequency domain with F_{hp}(u, v) its highpass filtered version, F_{lp}(u, v) its lowpass filtered component and H_{lp}(u, v) the transfer function of a lowpass filter. Then, unsharp masking can be implemented directly in the frequency domain by using a filter. Which of the following is the required filter?

A. H_{hp}(u, v) = H_{lp}(u, v)

B. H_{hp}(u, v) = 1 + H_{lp}(u, v)

C. H_{hp}(u, v) = – H_{lp}(u, v)

D. H_{hp}(u, v) = 1 – H_{lp}(u, v)

166. Unsharp masking can be implemented directly in the frequency domain by using a filter: H_{hp}(u, v) = 1 – H_{lp}(u, v), where H_{lp}(u, v) the transfer function of a lowpass filter. What kind of filter is H_{hp}(u, v)?

A. Composite filter

B. M-derived filter

C. Constant k filter

D. None of the mentioned

167. If unsharp masking can be implemented directly in the frequency domain by using a composite filter: H_{hp}(u, v) = 1 – H_{lp}(u, v), where H_{lp}(u, v) the transfer function of a lowpass filter. Then, the composite filter for High-boost filtering is __________

A. H_{hb}(u, v) = 1 – H_{hp}(u, v)

B. H_{hb}(u, v) = 1 + H_{hp}(u, v)

C. H_{hb}(u, v) = (A-1) – H_{hp}(u, v), A is a constant

D. H_{hb}(u, v) = (A-1) + H_{hp}(u, v), A is a constant

168. The frequency-domain Laplacian is closer to which of the following mask?

A. Mask that excludes the diagonal neighbors

B. Mask that excludes neighbors in 4-adjacency

C. Mask that excludes neighbors in 8-adjacency

D. None of the mentioned

169. To accentuate the contribution to enhancement made by high-frequency components, which of the following method(s) should be more appropriate to apply?

A. Multiply the highpass filter by a constant

B. Add an offset to the highpass filter to prevent eliminating zero frequency term by filter

C. All of the mentioned combined and applied

D. None of the mentioned

170. A process that accentuates the contribution to enhancement made by high-frequency components, by multiplying the highpass filter by a constant and adding an offset to the highpass filter to prevent eliminating zero frequency term by the filter is known as _______

A. Unsharp masking

B. High-boost filtering

C. High-frequency emphasis

D. None of the mentioned

171. Which of the following is a transfer function of High-frequency emphasis {H_{hfe}(u, v)} for H_{hp}(u, v) being the highpass filtered version of an image?

A. H_{hfe}(u, v) = 1 – H_{hp}(u, v)

B. H_{hfe}(u, v) = a – H_{hp}(u, v), a≥0

C. H_{hfe}(u, v) = 1 – b H_{hp}(u, v), a≥0 and b>a

D. H_{hfe}(u, v) = a + b H_{hp}(u, v), a≥0 and b>a

172. The transfer function of High-frequency emphasis is given as H_{hfe}(u, v) = a + b H_{hp}(u, v), for H_{hp}(u, v) being the highpass filtered version of the image, a≥0 and b>a. for certain values of a and b it reduces to High-boost filtering. Which of the following is the required value?

A. a = (A-1) and b = 0,A is some constant

B. a = 0 and b = (A-1),A is some constant

C. a = 1 and b = 1

D. a = (A-1) and b =1,A is some constant

173. The transfer function of High frequency emphasis is given as: H_{hfe}(u, v) = a + b H_{hp}(u, v), for H_{hp}(u, v) being the highpass filtered version of image,a≥0 and b>a. What happens when b increases past 1?

A. The high frequency is emphasized

B. The low frequency is emphasized

C. All frequencies are emphasized

D. None of the mentioned

174. The transfer function of High frequency emphasis is given as: H_{hfe}(u, v) = a + b H_{hp}(u, v), for H_{hp}(u, v) being the highpass filtered version of image,a≥0 and b>a. When b increases past 1 the filtering process is specifically termed as__________

A. Unsharp masking

B. High-boost filtering

C. Emphasized filtering

D. None of the mentioned

175. Validate the statement “Because of High-frequency emphasis the gray-level tonality due to low-frequency components is not lost”.

A. True

B. False

176. Which of the following fact is true for an image?

A. An image is the addition of illumination and reflectance component

B. An image is the subtraction of illumination component from reflectance component

C. An image is the subtraction of the reflectance component from the illumination component

D. An image is the multiplication of illumination and reflectance component

177. If an image is expressed as the multiplication of illumination and reflectance component i.e. f(x, y)= I (x, y) * r(x, y), then Validate the statement “We can directly use the equation f(x, y)= i(x, y) * r(x, y) to operate separately on the frequency component of illumination and reflectance”.

A. True

B. False

178. In Homomorphic filtering which of the following operations is used to convert input image to a discrete Fourier transformed function?

A. Logarithmic operation

B. Exponential operation

C. Negative transformation

D. None of the mentioned

179. A class of system that achieves the separation of illumination and reflectance component of an image is termed as __________

A. Base class system

B. Homomorphic system

C. Base separation system

D. All of the mentioned

180. Which of the following image component is characterized by a slow spatial variation?

A. Illumination component

B. Reflectance component

C. All of the mentioned

D. None of the mentioned