1.

What is a histogram? How histogram stretching and equalization enhances the quality of an image?

Answer»

It is a graph showing the number of pixels in an image at each different intensity value.

Eg. 256 different possible intensities for an eight-bit grayscale image.

Histogram equalization: 

  • It is the technique by which the dynamic range of the DN values of an image is increased.
  • It assigns the intensity values of pixels in the input image to show a uniform distribution of intensities. 
  • It improves contrast and obtains a uniform histogram

Histogram Stretching:

  • It is a simple image enhancement technique that improves the contrast image. 
  • It uses methods like linear and nonlinear contrast stretching for image enhancement.


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