This book will show you how to use OpenCV in an Android app that displays a
camera feed, saves and shares photos, manipulates colors and edges, and tracks
real-world objects in 2D or 3D. Integration with OpenGL is also introduced so that
you can start building augmented reality (AR) apps that superimpose virtual 3D
scenes onto tracked objects in the camera feed.
OpenCV is an open-source, cross-platform library that provides building blocks
for computer vision experiments and applications. It offers high-level interfaces
to capture, process, and present image data. For example, it abstracts away details
about camera hardware and array allocation. OpenCV is widely used in both
academia and industry.
Android is a mobile operating system that is mostly open source. For Java developers,
it offers a high-level application framework called Android SDK. Android apps are
modular insofar as they have standard, high-level interfaces to launch each other and
share data. Mobility, a high level of abstraction, and data sharing are great starting
points for a photo sharing app, similar to the one we will build.
Although OpenCV and Android provide a lot of high-level abstractions (and a lot of
open source code for curious users to browse), they are not necessarily easy to use
for newcomers. Setting up an appropriate development environment and translating
the libraries' broad functionality into application features are both daunting tasks.
This concise book helps us by placing an emphasis on a clean setup, clean application
design, and a simple understanding of each function's purpose.
The need for a book on this subject is particularly great because OpenCV's Java
and Android bindings are quite new and their documentation is not yet mature.
Little has been written about the steps for integrating OpenCV with Android's
standard camera, media, and graphics APIs. Surely, integration is a major part
of an app developer's work, so it is a major focus of this book.

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