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Raspberry Pi By Example

You're reading from   Raspberry Pi By Example Start building amazing projects with the Raspberry Pi right out of the box

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Product type Paperback
Published in Apr 2016
Publisher
ISBN-13 9781785285066
Length 294 pages
Edition 1st Edition
Languages
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Author (1):
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Arush Kakkar Arush Kakkar
Author Profile Icon Arush Kakkar
Arush Kakkar
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Table of Contents (17) Chapters Close

Preface 1. Introduction to Raspberry Pi and Python FREE CHAPTER 2. Minecraft Pi 3. Building Games with PyGame 4. Working with a Webcam and Pi Camera 5. Introduction to GPIO Programming 6. Creating Animated Movies with Raspberry Pi 7. Introduction to Computer Vision 8. Creating Your Own Motion Detection and Tracking System 9. Grove Sensors and the Raspberry Pi 10. Internet of Things with the Raspberry Pi 11. Build Your Own Supercomputer with Raspberry Pi 12. Advanced Networking with Raspberry Pi 13. Setting Up a Web Server on the Raspberry Pi 14. Network Programming in Python with the Pi A. Newer Raspberry Pi Models Index

Colorspaces and conversions


A colorspace is a mathematical model used to represent colors. Usually, colorspaces are used to represent colors in a numerical form and perform mathematical and logical operations with them. In this book, the colorspaces we mostly use are BGR (OpenCV's default colorspace), RGB, HSV, and grayscale. BGR stand for Blue, Green, and Red. HSV represents colors in the Hue, Saturation, and Value format. OpenCV has a cv2.cvtColor(img,conv_flag) function that allows us to change the colorspace of an img image, while the source and target colorspaces are indicated in the conv_flag parameter. We have learned that OpenCV loads images in the BGR format, and matplotlib uses the RGB format for images. So, before displaying images with matplotlib, we need to convert images from BGR to the RGB colorspace. Take a look at the following code. The programs read image in the color mode using cv2.imread(), which imports the image in the BGR colorspace. Then, it converts it into RGB...

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