Digital Image Processing interview Questions2

3.IMAGE ENHANCEMENT IN SPATIAL DOMAIN

1)The basic expression for spatial domain is_____________

ans)g(x,y)=T[f(x,y)]

2)The spatial processing is classified into__________________&spatial filtering.

ans)intensity transformation

3)______________________technique is used to modify image and perform image enhancement.

ans)Hiostogram

4)Afilter is used to perform linear operation on the image pixel is known as__________________

ans)linear spatial filter

5)________________refers to a flat image in which every pixel has same average value as that of entire image.

ans)zero spatial frequency

6)___________________filters are used to reduse the irrelevant information from the image.

ans)smoothing linear

7)_______________filters are effective in the presence of impulse noise.

ans)order static

8)To obtain good appearance on the screen the scaling constant________________is selected.

ans)255/6.4

9)The process of expanding the range of intensity levels in an image is known as________________

ans)contrast stretching

10)Image enhancement is done to improve the______________________of the image and decrease ambiguity between different regions of an image.

ans)quality

11)The gray level scaling is employed to enhance.( c)

    a)moss of water in satellite                                 b)flows in x_ray image

    c)both a&b                                                           d)nopne of the above

12)The histogram modeling technique used for image enhancement are( d)

        a)histogaram equalization          b)histogram modification

       c)histogram specification            d)all of the above

13)The methods of image enhancement are(c)

     a)spatial domain                       b)frequency domain

      c)both a&b                              d)none of the above

14)smooting linear filters suffer from ( a )

     a)blurring                      b)smoothing

     c)sharpening                  d)ranking

15)what is mean by contrst stretching?

ans)To increase the dynamic range of the gray levels in the processed image.

16)The gray levels of an image are__________________

ans)0 to 255

17)Gray levels are also called as______________

ans)intensity levels

18)the operations are performed on each and every pixels of an image is called as______________

Ans)spatial domain

19)Gradients are used for_____________

ans)implementing the first order derivatives.

20)The process of reversing the gray levels of an image is called as_________________

Ans)image negative

                                 4.IMAGE ENHANCEMENT IN FREQUENCY DOMAIN

1)The frequency domain method of image enhancement relies on__________theorem.

ans)convolution

2)The purpose of filtering in frequency domain results in smoothen,sharpen,deblur and___________________the image.

ans)restore

3)______________frequency filtering is used to sharpen the edges of an image.

ans)high

4)_______________________is achived in the frequency domain by attenuating particular high frequency range components in a transforms of a given image.

ans)smoothing

5)_________________filtering technique is employed to separate the illumination and reflectance components of an image.

ans)homomorphic

6)Noise is filtered out from an image using_____________filters.

ans)Gaussian

7)The second order derevatives for image enhancement are obtained by_____________operator.

ans)laplacian

8)The frequency domain methods for image enhancement are( d)

   a)contrast stretching                b)clipping and thresholding

    c)digital negative                     d)all of the above

9)An image enhancement tecqnique perform______________________operations.

ans)removing blurring and noise ,increasing contrast

10)An image can be expressed in terms  of _________________&_____________components.

ans)illumination&reflectance

11)What is a low pass filter?

ans)It allows only low frequency components and attenuate high frequency components.

12)what is an high pass filter?

ans)It allows only high frequency components.

13)The purpose of smoothinf filters are ______________

ans)To reduce the noise presenting in image

14)The purpose of sharpening filters are________

ans)To increase the contrast of an image.

15)The frequency domain methods of image enhancement is based on _____________theorem.

ans)convolution

16)Frequency domain methods are_________________

ans)contrast stretching,clipping&thresholding,digital negative.

17)Smoothing filters act as______________

ans)low pass filters

18)sharpening filters act as_________________

ans)high passfilters

19)what is the purpose of filter?

ans)To reduce the unwanted pixels.

20)The image f(x,y) is represented as_____________________-

ans)f(x,y)=i(x,y)r(x,y).