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You're reading from  Raspberry Pi Computer Vision Programming. - Second Edition

Product typeBook
Published inJun 2020
Reading LevelBeginner
PublisherPackt
ISBN-139781800207219
Edition2nd Edition
Languages
Python
Tools
OpenCV
Concepts
Computer Vision
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Author (1)
Ashwin Pajankar
Ashwin Pajankar
author image
Ashwin Pajankar

Ashwin Pajankar is an author, a YouTuber, and an instructor. He graduated from the International Institute of Information Technology, Hyderabad, with an MTech in Computer Science and Engineering. He has been writing programs for over two and a half decades. He is proficient in Linux, Unix shell scripting, C, C++, Java, JavaScript, Python, PowerShell, Golang, HTML, and assembly language. He has worked on single-board computers such as Raspberry Pi and Banana Pro. He is also proficient with microcontroller boards such as Arduino and the BBC Micro:bit. He is currently self-employed and teaches on Udemy and YouTube. He also organizes programming boot camps for working professionals and software companies.
Read more about Ashwin Pajankar

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Performing transformation operations on images

In this section, we will learn how to perform various mathematical transformation operations on images with OpenCV and Python 3.

Scaling

Scaling means resizing an image. It is a geometric operation. OpenCV offers a function, cv2.resize(), for performing this operation. It accepts an image, a method for the interpolation of pixels, and the scaling factor as arguments and returns a scaled image. The following methods are used for the interpolation of the pixels in the output:

  • cv2.INTER_LANCZOS4: This deals with the Lanczos interpolation method over a neighborhood of 8x8 pixels.
  • cv2.INTER_CUBIC: This deals with the bicubic interpolation method over a neighborhood of 4x4 pixels and is preferred for performing the zooming operation on an image.
  • cv2.INTER_AREA: This means resampling using pixel area relation. This is preferred for performing the shrinking operation on an image.
  • cv2.INTER_NEAREST: This means the method...
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Raspberry Pi Computer Vision Programming. - Second Edition
Published in: Jun 2020Publisher: PacktISBN-13: 9781800207219
© 2020 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Ashwin Pajankar

Ashwin Pajankar is an author, a YouTuber, and an instructor. He graduated from the International Institute of Information Technology, Hyderabad, with an MTech in Computer Science and Engineering. He has been writing programs for over two and a half decades. He is proficient in Linux, Unix shell scripting, C, C++, Java, JavaScript, Python, PowerShell, Golang, HTML, and assembly language. He has worked on single-board computers such as Raspberry Pi and Banana Pro. He is also proficient with microcontroller boards such as Arduino and the BBC Micro:bit. He is currently self-employed and teaches on Udemy and YouTube. He also organizes programming boot camps for working professionals and software companies.
Read more about Ashwin Pajankar

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