Book Image

Mastering OpenCV with Practical Computer Vision Projects

Book Image

Mastering OpenCV with Practical Computer Vision Projects

Overview of this book

Computer Vision is fast becoming an important technology and is used in Mars robots, national security systems, automated factories, driver-less cars, and medical image analysis to new forms of human-computer interaction. OpenCV is the most common library for computer vision, providing hundreds of complex and fast algorithms. But it has a steep learning curve and limited in-depth tutorials.Mastering OpenCV with Practical Computer Vision Projects is the perfect book for developers with just basic OpenCV skills who want to try practical computer vision projects, as well as the seasoned OpenCV experts who want to add more Computer Vision topics to their skill set or gain more experience with OpenCV's new C++ interface before migrating from the C API to the C++ API.Each chapter is a separate project including the necessary background knowledge, so try them all one-by-one or jump straight to the projects you're most interested in.Create working prototypes from this book including real-time mobile apps, Augmented Reality, 3D shape from video, or track faces & eyes, fluid wall using Kinect, number plate recognition and so on. Mastering OpenCV with Practical Computer Vision Projects gives you rapid training in nine computer vision areas with useful projects.
Table of Contents (15 chapters)
Mastering OpenCV with Practical Computer Vision Projects
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Rendering the 3D virtual object


So, by now you already know how to find the markers on the image to calculate their exact position in space, relative to the camera. It's time to draw something. As already mentioned, to render the scene we will use OpenGL functions. 3D visualization is a core part of Augmented Reality. OpenGL provides all the basic features for creating high-quality rendering.

Note

There are a large number of commercial and open source 3D-engines (Unity, Unreal Engine, Ogre, and so on). But all these engines use either OpenGL or DirectX to pass commands to the video card. DirectX is a proprietary API and it's supported only on the Windows platform. For this reason, OpenGL is the first and last candidate for building cross-platform rendering systems.

Understanding the principles of the rendering system will give you the necessary experience and knowledge to use these engines in the future or to write your own.

Creating the OpenGL rendering layer

In order to use OpenGL functions...