Book Image

Raspberry Pi Computer Vision Programming - Second Edition

By : Ashwin Pajankar
5 (1)
Book Image

Raspberry Pi Computer Vision Programming - Second Edition

5 (1)
By: Ashwin Pajankar

Overview of this book

Raspberry Pi is one of the popular single-board computers of our generation. All the major image processing and computer vision algorithms and operations can be implemented easily with OpenCV on Raspberry Pi. This updated second edition is packed with cutting-edge examples and new topics, and covers the latest versions of key technologies such as Python 3, Raspberry Pi, and OpenCV. This book will equip you with the skills required to successfully design and implement your own OpenCV, Raspberry Pi, and Python-based computer vision projects. At the start, you'll learn the basics of Python 3, and the fundamentals of single-board computers and NumPy. Next, you'll discover how to install OpenCV 4 for Python 3 on Raspberry Pi, before covering major techniques and algorithms in image processing, manipulation, and computer vision. By working through the steps in each chapter, you'll understand essential OpenCV features. Later sections will take you through creating graphical user interface (GUI) apps with GPIO and OpenCV. You'll also learn to use the new computer vision library, Mahotas, to perform various image processing operations. Finally, you'll explore the Jupyter Notebook and how to set up a Windows computer and Ubuntu for computer vision. By the end of this book, you'll be able to confidently build and deploy computer vision apps.
Table of Contents (15 chapters)

2D convolution with the signal processing module in SciPy

Now, let's take a look at the mathematical background of convolution. Convolution is understanding how the shape of a function is affected by another function. The process of computing it and the resultant function is known as a convolution. We can perform convolutions on 1D, 2D, and multidimensional data. Signals are multidimensional entities. Images are a type of signal. So, we can apply convolution to an image.

Note

You can read more about convolution at http://www.songho.ca/dsp/convolution/convolution2d_example.html.

We can perform convolution operations on images with various kernels to process images. For that, we will learn how to use the signal module from SciPy. Let's install the SciPy library with the following command:

pip3 install scipy

We can perform convolution operations on images with various kernels to process images. The function that performs convolution on 2D data is signal.convolve2d...