1. The expression [∂2 f(x,y)/∂x2 +∂2 f(x,y)/∂y2] is considered as _________ where f(x, y) is an input image.
A. Laplacian of f(x, y)
B. Gradient of f(x, y)
C. All of the mentioned
D. None of the mentioned
2. If the Laplacian in the frequency domain is:
A. Laplacian operation
B. Filtering operation
C. Shift operation
D. None of the mentioned
3. The Laplacian in frequency domain is simply implemented by using filter __________
A. H(u, v)= -(u2– v2)
B. H(u, v)= -(1)
C. H(u, v)= -(u2+ v2)
D. none of the mentioned
4. Assuming that the origin of F(u, v), Fourier transformed the function of f(x, y) an input image, has been correlated by performing the operation f(x, y)(-1)x+y before taking the transform of the image. If F and f are of the same size, then what does the given operation is/are supposed to do?
A. Resize the transform
B. Rotate the transform
C. Shifts the center transform
D. All of the mentioned
5. Assuming that the origin of F(u, v), Fourier transformed the function of f(x, y) an input image, has been correlated by performing the operation f(x, y)(-1)x+y before taking the transform of the image. If F and f are of the same size M*N, where do the point (u, v) =(0,0) shift?
A. (M -1, N -1)
B. (M/2, N/2)
C. (M+1, N+1)
D. (0, 0)
6. Assuming that the origin of F(u, v), Fourier transformed the function of f(x, y) an input image, has been correlated by performing the operation f(x, y)(-1)x+y before taking the transform of the image. If F and f are of the same size M*N, then which of the following is an expression for H(u, v), the filter used for implementing Laplacian in the frequency domain?
A. H(u, v)= -(u2+ v2)
B. H(u, v)= -(u2– v2)
C. H(u, v)= -[(u – M/2)2+ (v – N/2)2].
D. H(u, v)= -[(u – M/2)2– (v – N/2)2].
7. Computing the Fourier transform of the Laplacian result in the spatial domain is equivalent to multiplying the F(u, v), Fourier transformed the function of f(x, y) an input image, and H(u, v), the filter used for implementing Laplacian in the frequency domain. This dual relationship is expressed as _________
A. Fourier transform pair notation
B. Laplacian
C. Gradient
D. None of the mentioned
8. Computing the Fourier transform of the Laplacian result in the spatial domain is equivalent to multiplying the F(u, v), Fourier transformed the function of f(x, y) an input image of size M*N, and H(u, v), the filter used for implementing Laplacian in the frequency domain. This dual relationship is expressed as Fourier transform pair notation given by_____________
A. ∇2 f(x,y)↔[(u –M/2)2+ (v –N/2)2]F(u,v)
B. ∇2 f(x,y)↔-[(u+M/2)2– (v+N/2)2]F(u,v)
C. ∇2 f(x,y)↔-[(u –M/2)2+ (v –N/2)2]F(u,v)
D. ∇2 f(x,y)↔[(u+M/2)2– (v+N/2)2]F(u,v)
9. An enhanced image can be obtained as g(x,y)=f(x,y)-∇2 f(x,y), where Laplacian is being subtracted from f(x, y) the input image. What does this conclude?
A. That the center spike would be negative
B. That the immediate neighbors of the center spike would be positive.
C. All of the mentioned
D. None of the mentioned
10. An enhanced image can be obtained as g(x,y)=f(x,y)-∇2 f(x,y), where Laplacian is being subtracted from f(x, y) the input image of size M*Non which an operation f(x, y)(-1)x+yis applied. Unlike enhancing in spatial domain with one single mask, it is possible to perform the same in the frequency domain using one filter. Which of the following is/are the required filter(s)?
A. H(u, v)= -[1 + u2+ v2].
B. H(u, v)= -[(u – M/2)2+ (v– N/2)2].
C. H(u, v)= [1 + (u – M/2)2+ (v – N/2)2].
D. All of the mentioned