A quick start to image processing

Once OpenCV is installed on your Raspberry Pi, you can start working on one of the widely used image processing library. In this section, you will learn how to perform basic image operations such as opening an image, reading an image, saving the image to other format and pixel manipulation, and so on. You will also learn about arithmetic operation on images, reading a video file, and opening a video file.

Reading and opening an image

One of the very basic operations in image processing is reading and opening an image.

1. Open your terminal window and create a new folder titled chapter5 in which you will put all your code by executing the following command:

   cd /home/pi/
   mkdir chapter5
   

2. Create a new python file using this code:

   nano readImage.py
   

3. Copy any of the image file to the chapter5 folder. I had the test.jpg image in the folder. Copy the following command in the file using this code:

   #import the python opencv module
   import cv2
   #imread will read an image
   img=cv2...