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OpenCV By Example by Vinícius Godoy, David Millán Escrivá, Prateek Joshi

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Chapter 4. Delving into Histograms and Filters

In the previous chapter, we learned the basics of user interfaces in OpenCV using QT or native libraries and how to use advanced OpenGL user interfaces. We learned basic color conversions and filters that helped us create our first application.

In this chapter, we will cover the following topics:

  • Histogram and histogram equalization
  • Look up tables
  • The blur and median blur
  • The Gaussian Canny filter
  • Image color equalization
  • Understanding conversion between image types

After we learn the basics of OpenCV and user interfaces, we will create our first complete application and a basic photo tool with the following functionalities in this chapter:

  • Calculate and draw a histogram
  • Histogram equalization
  • The lomography ...

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