Ruby and Computer Vision: A Starter Guide


Computer vision involves the use of algorithms and tools to enable computers to interpret and understand visual information from the world. Ruby, in conjunction with libraries like OpenCV and Ruby-Vips, can be used for various computer vision tasks. In this guide, we'll explore the basics of using Ruby for computer vision.


Before you start, make sure you have the following prerequisites:

  • Basic knowledge of the Ruby programming language
  • A code editor (e.g., Visual Studio Code, Sublime Text)
  • Familiarity with computer vision concepts

Step 1: Choose a Computer Vision Library

Ruby provides access to computer vision libraries, the most prominent being OpenCV. You can use the "opencv" gem to work with OpenCV in Ruby:

# Install the opencv gem
gem install opencv-ruby

Step 2: Basic Image Processing

With Ruby and OpenCV, you can perform basic image processing operations such as loading images, resizing, applying filters, and saving the processed images. Here's a sample code to load an image, convert it to grayscale, and save the result:

require 'opencv'
# Load an image
image = OpenCV::IplImage.load('path/to/your/image.jpg')
# Convert the image to grayscale
gray_image = image.BGR2GRAY
# Save the grayscale image'path/to/save/gray_image.jpg')

Step 3: Advanced Computer Vision Tasks

Ruby can be used for more advanced computer vision tasks such as object detection, facial recognition, and feature extraction. You can explore these tasks by delving deeper into OpenCV's capabilities and combining them with Ruby's scripting power.


Ruby is a versatile language for computer vision tasks when combined with libraries like OpenCV. Whether you're interested in building image processing pipelines, developing computer vision applications, or experimenting with machine learning, Ruby provides a powerful platform for visual data analysis.

As you progress in the field of computer vision, you can explore more advanced topics like deep learning for image recognition and real-time video analysis.

Embrace the world of computer vision with Ruby and uncover its potential in solving visual challenges.