Question

List the 2 methods of sharpening of an image and include a brief statement for each...

  1. List the 2 methods of sharpening of an image and include a brief statement for each regarding how the process is accomplished. (4 points)
  1. Describe the process of histogram creation during image processing. What are the VOI? What is histogram rescaling? (3 points)
  1. Why is a high signal-to-noise ratio important for an image? (1 point)
Science   Advanced-Physics   
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Answer #1

1. The methods used for sharpening the images are:

(i) Sharpening by using High Pass Filters: in this method a set of high pass filtered image is added to the original image to enhance the image, the high pass filter image will only have have high frequency components and when a scaled version of this image is added to the original image, a sharpened image is produced.

(ii) Unsharp Masking: This method is available in digital image processing softwares. In this method a unsharp or blurred negative of original image is used to create a mask. This mask is then combined with the original image, which creates a less blurry image as compared to the original image. (In result this method also amplifies the high frequency components of the image)

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