Enhancement using Arithmetic Operations MCQ

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

  The noise is correlated at every pair of coordinate (x, y)

  খ

  The noise has average value 1 at every pair of coordinate (x, y)

  গ

  All of the mentioned

  ঘ

  None of the mentioned
• Which of the following is/are the fundamental factors that need tight control for difference based inspection work?
  ক

  Proper registration

  খ

  Controlled illum ination

  গ

  Noise levels should be low enough so that the variation due to noise won’t affect the difference value much

  ঘ

  All of the mentioned
• 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 lim its. What is/are those lim its?
  ক

  Very complex method

  খ

  Very difficult to implement

  গ

  The truncation inherent in division by 2 causes loss in accuracy

  ঘ

  All of the mentioned
• 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?
  ক

  0 to 255

  খ

  0 to 511

  গ

  -255 to 0

  ঘ

  None of the mentioned
• The subtraction operation results in areas that appear as dark shades of gray. Why?
  ক

  Because the difference in such areas is little, that yields low value

  খ

  Because the difference in such areas is high, that yields low value

  গ

  Because the difference in such areas is high, that yields high value

  ঘ

  None of the mentioned
• Which of the following is/are more commercially successful image enhancement method in mask mode radiography, an area under medical imaging?
  ক

  Addition

  খ

  Subtraction

  গ

  Multiplication

  ঘ

  Division