Chapter 5. Let's Make Some Noise

In the previous chapter, we learned about colorspace conversion, transformations, and threshold. In this chapter, we will learn about the basics of noise in images and low-pass filtering techniques. Here are the topics that we will explore in this chapter:

  • The basics of noise and the introducing of salt-and-pepper noise to an image
  • Kernel and low-pass filters
  • Low-pass filtering techniques


Noise means any unwanted signal. Image/video noise signifies unwanted variations in the intensity (for grayscale image) or color (for color images) that is not present in the real object that was photographed or recorded. Image noise is a form of electronic disruption, and it can come from many sources, such as camera sensors ...

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