AugmentedImageDatabase

public class AugmentedImageDatabase

Database containing a list of images to be detected and tracked by ARCore.

An image database supports up to 1000 images. A database can be generated by the arcoreimg command-line database generation tool provided in the SDK, or dynamically created at runtime by adding individual images to an AugmentedImageDatabase.

Only one image database can be active in a session. Any images in the currently active image database that have a TRACKING/PAUSED state will immediately be set to the STOPPED state if a different or null image database is made active in the current session Config.

Public Constructors

AugmentedImageDatabase(Session session)

Creates a new empty image database.

Public Methods

int	addImage(String name, Bitmap bitmap) Adds a single named image of unknown physical size to the augmented image database from an Android bitmap.
int	addImage(String name, Bitmap bitmap, float widthInMeters) Adds a single named image with known physical size to the augmented image database from an Android bitmap, with a specified physical width in meters.
static AugmentedImageDatabase	deserialize(Session session, InputStream inputStream) Creates a new image database from an input stream.
int	getNumImages() Returns the number of images in the database.
void	serialize(OutputStream outputStream) Serializes the database to an OutputStream.

Inherited Methods

From class java.lang.Object

Object	clone()
boolean	equals(Object arg0)
void	finalize()
final Class<?>	getClass()
int	hashCode()
final void	notify()
final void	notifyAll()
String	toString()
final void	wait(long arg0, int arg1)
final void	wait(long arg0)
final void	wait()

Public Constructors

public AugmentedImageDatabase (Session session)

Creates a new empty image database.

Parameters

session

Public Methods

public int addImage (String name, Bitmap bitmap)

Adds a single named image of unknown physical size to the augmented image database from an Android bitmap. Returns the zero-based positional index of the image within the database.

If the physical size of the image is known, use addImage(String, Bitmap, float) instead, to improve image detection time.

For images added via this method, ARCore estimates the physical image's size and pose at runtime when the physical image is visible and is being tracked. This extra estimation step will require the user to move their device to view the physical image from different viewpoints before the size and pose of the physical image can be estimated.

This method takes time to perform non-trivial image processing (20ms - 30ms), and should be run on a background thread to avoid blocking the UI thread.

Parameters

name	Name metadata for this image, does not have to be unique.
bitmap	Bitmap containing the image in ARGB_8888 format. The alpha channel is ignored in this bitmap, as only non-transparent images are currently supported.

Throws

ImageInsufficientQualityException	if the image quality is image is insufficient, e.g. if the image has not enough features.
IllegalArgumentException	if the bitmap is not in ARGB_888 format.

public int addImage (String name, Bitmap bitmap, float widthInMeters)

Adds a single named image with known physical size to the augmented image database from an Android bitmap, with a specified physical width in meters. Returns the zero-based positional index of the image within the database.

If the physical size of the image is not known, use addImage(String, Bitmap) instead, at the expense of an increased image detection time.

For images added via this method, ARCore can estimate the pose of the physical image at runtime as soon as ARCore detects the physical image, without requiring the user to move the device to view the physical image from different viewpoints. Note that ARCore will refine the estimated size and pose of the physical image as it is viewed from different viewpoints.

This method takes time to perform non-trivial image processing (20ms - 30ms), and should be run on a background thread to avoid blocking the UI thread.

Parameters

name	Name metadata for this image, does not have to be unique.
bitmap	Bitmap containing the image in ARGB_8888 format. The alpha channel is ignored in this bitmap, as only non-transparent images are currently supported.
widthInMeters	Width in meters for this image, must be strictly greater than zero.

Throws

ImageInsufficientQualityException	if the image quality is image is insufficient, e.g. if the image has not enough features.
IllegalArgumentException	if the bitmap is not in ARGB_888 format or the width in meters is less than or equal to zero.

public static AugmentedImageDatabase deserialize (Session session, InputStream inputStream)

Creates a new image database from an input stream. The stream contents must have been generated by the command-line database generation tool provided in the SDK, or at runtime from serialize(OutputStream).

Note: this method takes about 10-20ms for a 5MB byte input stream. Run this in a background thread if this affects your application.

Parameters

session
inputStream

Throws

DataInvalidFormatException	if the input stream is not formatted properly as an image database.
DataUnsupportedVersionException	if the database is incompatible with the current SDK.
IOException

public int getNumImages ()

Returns the number of images in the database.

public void serialize (OutputStream outputStream)

Serializes the database to an OutputStream.

Parameters

outputStream

Throws

IOException