book

Augmented Reality for Android Application Development

by Jens Grubert

November 2013

Intermediate to advanced

134 pages

3h 12m

English

Packt Publishing

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What this book covers

Downloading the example codeErrataPiracyQuestions
A quick overview of AR conceptsSensory augmentationDisplaysRegistration in 3DInteraction with the environmentChoose your style – sensor-based and computer vision-based ARSensor-based ARComputer vision-based ARAR architecture conceptsAR software componentsAR control flowSystem requirements for development and deploymentInstalling the Android Developer Tools Bundle and the Android NDKInstalling JMonkeyEngineInstalling VuforiaTMWhich Android devices should you use?
Understanding the cameraCamera characteristicsCamera versus screen characteristics
Creating an Eclipse projectPermissions in the Android manifestCreating an activity that displays the cameraSetting camera parametersCreating SurfaceView
Creating the JME activityCreating the JME application
The building blocks of 3D rendering
Camera parameters (intrinsic orientation)
Knowing where you are – handling GPSGPS and GNSSJME and GPS – tracking the location of your device
Understanding sensorsSensors in JME
Sensor fusion in a nutshellSensor fusion in JME
Querying for POIs around your current locationParsing the Google Places APIs results
Introduction to computer vision-based tracking and VuforiaTMChoosing physical objectsUnderstanding frame markersUnderstanding natural feature tracking targets
The C++ integrationThe Java integrationSummary
Pick the stick – 3D selection using ray picking
Managing your contentMulti-targetsCloud recognition

Content preview from Augmented Reality for Android Application Development

Real camera and virtual camera

A virtual camera for 3D graphics rendering is generally represented by two main sets of parameters: the extrinsic and intrinsic parameters. The extrinsic parameters define the location of the camera in the virtual world (the transformation from the world coordinate system to the camera coordinate system and vice versa). The intrinsic parameters define the projective properties of the camera, including its field of view (focal length), image center, and skew. Both the parameters can be represented with different data structures, with the most common being a matrix.

If you develop a 3D mobile game, you are generally free to configure the cameras the way you want; you can put the camera above a 3D character running on ...