If in an image there exist similar change in gray-level values in the image, which of the following shows a stronger response using second order derivative operator for sharpening?(a) A line(b) A step(c) A point(d) None of the mentionedI have been asked this question in an international level competition.My question is taken from Sharpening Spatial Filters-2 in section Intensity Transformations and Spatial Filtering of Digital Image Processing

If in an image there exist similar change in gray-level values in the

1.	If in an image there exist similar change in gray-level values in the image, which of the following shows a stronger response using second order derivative operator for sharpening?(a) A line(b) A step(c) A point(d) None of the mentionedI have been asked this question in an international level competition.My question is taken from Sharpening Spatial Filters-2 in section Intensity Transformations and Spatial Filtering of Digital Image Processing
Answer» RIGHT option is (c) A point For EXPLANATION: second ORDER derivative shows a stronger response to a LINE than a step and to a point than a line, if there is similar changes in gray-level values in an image.

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