Packt Publishing is always offering free e-books and today is great if you want to learn about image processing. You will use the OpenCV library with Python with today’s book. Here is the book blurb:

OpenCV is an open source computer vision and machine learning software library that provides a common infrastructure for computer vision applications. Today’s free eBook has practical, project-based tutorials for Python developers and hobbyists who want to get started with computer vision with the OpenCV library and Python. If you have always wanted to learn which version of the Python bindings for OpenCV to use, how to integrate with cross-platform Kinect drivers, and how to efficiently process image data with NumPy and SciPy, then this book is for you!

All you need to do is sign up on the Packt website. Start here to claim your free e-book.