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Hands-On Robotics Programming with C++

You're reading from   Hands-On Robotics Programming with C++ Leverage Raspberry Pi 3 and C++ libraries to build intelligent robotics applications

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Product type Paperback
Published in Mar 2019
Publisher Packt
ISBN-13 9781789139006
Length 312 pages
Edition 1st Edition
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Authors (2):
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Lentin Joseph Lentin Joseph
Author Profile Icon Lentin Joseph
Lentin Joseph
Dinesh Tavasalkar Dinesh Tavasalkar
Author Profile Icon Dinesh Tavasalkar
Dinesh Tavasalkar
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Toc

Table of Contents (16) Chapters Close

Preface 1. Section 1: Getting Started with wiringPi on a Raspberry Pi FREE CHAPTER
2. Introduction to the Raspberry Pi 3. Implementing Blink with wiringPi 4. Section 2: Raspberry Pi Robotics
5. Programming the Robot 6. Building an Obstacle-Avoiding Robot 7. Controlling a Robot Using a Laptop 8. Section 3: Face and Object Recognition Robot
9. Accessing the RPi Camera with OpenCV 10. Building an Object-Following Robot with OpenCV 11. Face Detection and Tracking Using the Haar Classifier 12. Section 4: Smartphone-Controlled Robot
13. Building a Voice-Controlled Robot 14. Assessments 15. Other Books You May Enjoy

Capturing images and video with the RPi camera

Let's see how we can take pictures and record video with our RPi. Open the Terminal window and type the following command:

raspistill -o image1.jpg

In this command, we used raspistill to take a still picture and saved it as image1.jpg.

Since the Terminal window is pointing to the pi directory, this image is saved in the pi folder. To open this image, open the pi folder and inside it, you will see image1.jpg. Images captured using the RPi camera have a native resolution of 3,280 x 2,464 pixels:

The output of image1 is shown in the following screenshot:

If we want to flip the image horizontally, we can add the -hf command, and if we want to flip it vertically, we can add -vf command inside the raspistill code:

raspistill -hf -vf -o image2.jpg

The image2.jpg file is also saved in the pi folder, and its output is shown in the...

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