7. Introduction to Computer Vision | Raspberry Pi By Example

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Table Of Contents

Raspberry Pi By Example

By : Kakkar

5 (1)

Raspberry Pi By Example

5 (1)

By: Kakkar

Overview of this book

Want to put your Raspberry Pi through its paces right out of the box? This tutorial guide is designed to get you learning all the tricks of the Raspberry Pi through building complete, hands-on hardware projects. Speed through the basics and then dive right in to development! Discover that you can do almost anything with your Raspberry Pi with a taste of almost everything. Get started with Pi Gaming as you learn how to set up Minecraft, and then program your own game with the help of Pygame. Turn the Pi into your own home security system with complete guidance on setting up a webcam spy camera and OpenCV computer vision for image recognition capabilities. Get to grips with GPIO programming to make a Pi-based glowing LED system, build a complete functioning motion tracker, and more. Finally, get ready to tackle projects that push your Pi to its limits. Construct a complete Internet of Things home automation system with the Raspberry Pi to control your house via Twitter; turn your Pi into a super-computer through linking multiple boards into a cluster and then add in advanced network capabilities for super speedy processing!

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Introduction to Raspberry Pi and Python

1. Introduction to Raspberry Pi and Python

Single-board computers

Raspberry Pi

Operating systems

Setting up the Raspberry Pi

Getting started with Python

Summary

2. Minecraft Pi

2. Minecraft Pi

Introduction to Minecraft Pi

Playing Minecraft Pi

Python programming for Minecraft Pi

Summary

3. Building Games with PyGame

3. Building Games with PyGame

Introducing PyGame

Installing PyGame

Drawing a binary fractal tree

Building a snake game

Summary

4. Working with a Webcam and Pi Camera

4. Working with a Webcam and Pi Camera

Working with webcams

Working with the Pi Camera and NoIR Camera modules

Summary

5. Introduction to GPIO Programming

5. Introduction to GPIO Programming

Introducing GPIO pins

Building an LED Blinker

Installing PiGlow

Using PiGlow

Building a binary clock

Summary

6. Creating Animated Movies with Raspberry Pi

6. Creating Animated Movies with Raspberry Pi

Introducing stop-motion animation

Setting up the prerequisites

Rendering the video

Summary

7. Introduction to Computer Vision

7. Introduction to Computer Vision

Introducing Computer Vision

Introducing OpenCV

Setting up Pi for Computer Vision

Introducing NumPy

Working with images

Working with Webcam using OpenCV

Retrieving image properties

Arithmetic operations on images

Splitting and merging image color channels

Logical operations on images

Colorspaces and conversions

Tracking in real time based on color

Summary

8. Creating Your Own Motion Detection and Tracking System

8. Creating Your Own Motion Detection and Tracking System

Thresholding images

Noise

Morphological transformations on images

Motion detection and tracking

Summary

9. Grove Sensors and the Raspberry Pi

9. Grove Sensors and the Raspberry Pi

Introducing the GrovePi

Setting up the GrovePi

Displaying the weather

Intruder detection system

Summary

10. Internet of Things with the Raspberry Pi

10. Internet of Things with the Raspberry Pi

Introducing the Internet of Things

Installing the Twitter API for Python

Setting up a SQLite database in Python

Building a tweeting weather station

Summary

11. Build Your Own Supercomputer with Raspberry Pi

11. Build Your Own Supercomputer with Raspberry Pi

Introducing a Pi-based supercomputer

Installing and configuring MPICH2 and MPI4PY

Setting up the Raspberry Pi cluster

Setting up SSH access from the host to the client

Running code in parallel

Performance benchmarking of the cluster

Introducing N-Body simulations

Installing and running GalaxSee

Summary

12. Advanced Networking with Raspberry Pi

12. Advanced Networking with Raspberry Pi

Introducing DHCP

A few networking concepts

Configuring a Raspberry Pi to act as a DHCP server

Introducing Domain Naming System (DNS)

Setting up a DNS server on the Pi

Configuring the setup for a web server

Automating node discovery in a network

Summary

13. Setting Up a Web Server on the Raspberry Pi

13. Setting Up a Web Server on the Raspberry Pi

Introducing and installing Apache on Raspbian

Installing PHP and MySQL

Installing WordPress

Summary

14. Network Programming in Python with the Pi

14. Network Programming in Python with the Pi

The basics of sockets

The difference between TCP and UDP

Looking back

A Telnet client in Python

A chat program

References

Exercise

Summary

A. Newer Raspberry Pi Models

A. Newer Raspberry Pi Models

The Raspberry Pi Zero

The Raspberry Pi 3

Index

Index

Setting up Pi for Computer Vision

Make sure that you have a working, wired Internet connection with reasonable speed for this activity. Now, let's prepare our Pi for computer vision:

Connect your Pi to the Internet through Ethernet or a Wi-Fi USB dongle.
Run the following command to restart the networking service:
```
sudo service networking restart
```
Make sure that Raspberry Pi is connected to the Internet by typing in the following command:
```
ping –c4 www.google.com
```
If the command fails, then check the Internet connection with some other device and resolve the issue. After that, repeat the preceding steps again.

Run the following commands in a sequence:

sudo apt-get update
sudo apt-get upgrade
sudo rpi-update
sudo reboot –h now

After this, we will need to install a few necessary packages and dependencies for OpenCV. The following is the list of packages we need to install. You just need to connect your Pi to the Internet and type this in:
```
sudo apt-get install <package-name> -y
```
Here, <package...

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