For finding vertical lines we use mask of values

• a) [1 1 1;

  0 0 0;

  1 -1 -1]

• a) [1 0 -1;

  1 0 -1;

  1 0 -1]

• a) [1 1 0;

  1 0 -1;

  0 -1-1]

1. The value of each coefficient in a 9 ˣ 9 mean filter is

• 1/9

• 1/18

• 1/81

Image _______and _____ are the most primitive operations in morphology.

• opening and closing

• erosion and dilation

• only dilation

• only erosion

Image ____________ could be use as noise

removal method.

• erosion

• dilation

Noise is usually described by its

• power

• period

• probabilistic characteristics.

The Gaussian smoothing operator is used to

• sharpening edges

• `blur' images and remove detail and noise.

• detect edges

Which of the following filters is effective in the presence of noise?

• mean filter

• Average filter

• Adaptive filter

Fourier transform is a ________________ transform.

• linear

• non linear

• non reversable

_______restoration filter perform well with noise

• inverse filter

• winner filter

• mean filter

________restoration filter suffer from division by small values can produce very large values that dominate the output.

• inverse

• winner

• median